water-resources investigations report 90-4017 · tables (continued) page 59. st. francis river at...

TRENDS AND COMPARISON OF WATER QUALITY AND BOTTOM MATERIAL OF NORTHEASTERN

ARKANSAS STREAMS, 1974-85, AND EFFECTS OF PLANNED DIVERSIONS

By James C. Petersen

U.S. GEOLOGICAL SURVEY

Water-Resources Investigations Report 90-4017

Prepared in cooperation with the

ARKANSAS SOIL AND WATER CONSERVATION COMMISSION

Little Rock, Arkansas

1990

DEPARTMENT OF THE INTERIOR

MANUEL LUJAN, JR., Secretary

U.S. GEOLOGICAL SURVEY

Dallas L. Peck, Director

For additional information write to:

District ChiefU.S. Geological Survey2301 Federal Office Building700 West Capitol AvenueLittle Rock, Arkansas 72201

Copies of this report can be purchased from:

U.S. Geological Survey Books and Open-File Reports Federal Center, Building 810 Box 25425 Denver, Colorado 80225

CONTENTS

Page

Abstract................................................................ 1Introduction............................................................ 2

Purpose and scope.................................................. 2Study area description............................................. 6Previous investigations............................................ 6Acknowledgments.................................................... 8

Data summarized......................................................... 8Calculation and reporting of descriptive statistics..................... 9Water-quality time trends............................................... 10

Methods............................................................ 10Specific conductance............................................... 13Sodium adsorption ratio............................................ 13Dissolved sulfate.................................................. 13Dissolved chloride................................................. 13Fecal-coliform bacteria............................................ 13Total phosphorus................................................... 14Total ammonia...................................................... 14

Trends and comparison of water quality of streams....................... 14Arkansas River..................................................... 14Bayou Meto-Bayou Two Prairie....................................... 15Black River-Current River.......................................... 15Cache River-Bayou DeView........................................... 15St. Francis River.................................................. 16St. Francis River tributaries...................................... 16White River........................................................ 17

Pesticides in bottom material........................................... 17Comparison of data with water-quality criteria and standards............ 18

Commonly unmet criteria and standards.............................. 18Iron......................................................... 18Total phosphorus............................................. 19Fecal-coliform bacteria...................................... 19Turbidity.................................................... 19Lead and copper.............................................. 19

Comparisons by river............................................... 19Arkansas River............................................... 19Bayou DeView................................................. 20Black River.................................................. 20Cache River.................................................. 20St. Francis River............................................ 20White River.................................................. 20

Effects of diversions on water quality.................................. 21Diversions to other streams........................................ 21

Scope of assessment of effects of diversions................. 24Diversion from Little Red River near West Point.............. 25Diversion from White River near Des Arc...................... 25Diversion from White River near DeValls Bluff westward....... 25Diversion from Arkansas River near David D. Terry Lockand Dam.................................................... 26

Diversion from Black River near Black Rock................... 26Diversion from White River near DeValls Bluff eastward....... 27

iii

CONTENTS (continued)

Page

Diversions for artificial recharge................................. 27Summary and conclusions................................................. 29References.............................................................. 32Index of stations....................................................... 38

ILLUSTRATIONS Figure 1-4. Maps showing:

1. Location of study area................................. 32. Location of water-quality network stations operated by

Arkansas Department of Pollution Control and Ecology and U.S. Geolog ical Survey........................... 4

3. Location of water-quality stations that are not part of Arkansas Department of Pollution Control and Ecology or U.S. Geological Survey networks........... 5

4. Location of proposed surface-water diversions from the Little Red, White, and Arkansas Rivers and nearby water-quality stations............................... 22

5. Location of proposed surface-water diversions from the White and Black Rivers and nearby water-quality stations............................................. 23

TABLES

Page

Table 1. Arkansas Department of Pollution Control and Ecology and U.S. Geological Survey stations summarized and related information................................................ 40

2. Properties, associated parameter codes, and wateryears included in statistical summaries.................... 42

3. Values assigned as greatest detection limits used by Arkansas Department of Pollution Control and Ecology and U.S. Geological Survey laboratories between 1974 and 1985....... 48

4-40. Results of Seasonal Kendall trend analysis for:4. St. Francis River at St. Francis, Ark., 07040100......... 505. St. Francis River at Lake City, Ark., 07040450........... 516. Right Hand Chute of Little River at Big Lake

Outlet near Manila, Ark., 07046500....................... 527. Pemiscot Bayou at Dell, Ark., 07047400................... 538. Tyronza River near Twist, Ark., 07047700................. 549. St. Francis River at Parkin, Ark., 07047800.............. 55

10. St. Francis Bay at Riverfront, Ark., 07047900............ 5611. L'Anguille River near Colt, Ark., 07047942............... 5712. L'Anguille River at Marianna, Ark., 07047964............. 5813. St. Francis River north of Helena, Ark., 07047968........ 5914. White River at Oil Trough, Ark., 07061105................ 6015. Black River near Corning, Ark., 07064000................. 6116. Current River near Pocahontas, Ark., 07068850............ 6217. Black River -at Pocahontas, Ark., 07069000................ 63

IV

TABLES (continued)

Page

18. Black River at Black Rock, Ark., 07072500................ 6419. Black River at Jacksonport, Ark., 07074490............... 6520. White River at Newport, Ark., 07074500................... 6621. White River near Augusta, Ark., 07074850................. 6722. Little Red River at Judsonia, Ark., 07076634............. 6823. White River at DeValls Bluff, Ark., 07077000............. 6924. Cache River near Cash, Ark., 07077400.................... 7025. Cache River at Patterson, Ark., 07077500................. 7126. Cache River at Brasfield, Ark., 07077600................. 7227. Bayou DeView near Gibson, Ark., 07077660................. 7328. Bayou DeView at Morton, Ark., 07077700................... 7429. Bayou DeView near Brasfield, Ark., 07077750.............. 7530. White River at Clarendon, Ark., 07077800................. 7631. White River at St. Charles, Ark., 07077820............... 7732. Big Creek near Watkins Corner, Ark., 07077960............ 7833. White River at Arkansas Post Canal near Nady, Ark.,

07078285............................................... 7934. Arkansas River at Murray Dam at Little Rock, Ark.,

07263450............................................... 8035. Arkansas River at David D. Terry Lock and Dam below

Little Rock, Ark., 07263620............................ 8136. Arkansas River at Lock and Dam 3 near Swan Lake, Ark.,

07263750............................................... 8237. Bayou Meto near Lonoke, Ark., 07264000................... 8338. Bayou Two Prairie near Cabot, Ark., 07264050............. 8439. Bayou Meto near Bayou Meto, Ark., 07265099............... 8540. Arkansas River at Dam No. 2 near Gillett, Ark.,

07265283............................................... 8641-119. Statistical summary of selected water-quality properties for:

41. St. Francis River at Fisk, Mo., 07040000................. 8742. St. Francis River near Powe, Mo., 07040057............... 8843. St. Francis River near Glennonville, Mo., 07040060....... 8944. Wilhelmina Cutoff near Campbell, Mo., 07040070........... 9045. St. Francis River at St. Francis, Ark., 07040100......... 9146. St. Francis River near Piggott, Ark., 07040110........... 9347. St. Francis River at Holly Island, Ark., 07040130........ 9448. Varney River near Senath, Mo., 07040150.................. 9549. Big Slough Ditch near Paragould, Ark., 07040350.......... 9650. Locust Creek Ditch near Paragould, Ark., 07040424........ 9751. Eightmile Ditch near Paragould, Ark., 07040428.......... 9852. St. Francis River at Lake City, Ark., 07040450........... 9953. St. Francis River at Lake City, Ark., 07040450 (June

through September)..................................... 10154. Cockle Burr Slough Ditch near Monette, Ark., 07040496.... 10355. Right Hand Chute of Little River at Big Lake Outlet near

Manila, Ark., 07046500................................. 10456. Right Hand Chute of Little River at Rivervale, Ark.,

07046600............................................... 10557. Pemiscot Bayou at Dell, Ark., 07047400................... 10658. Tyronza River near Twist, Ark., 07047700................. 107

TABLES (continued)

Page

59. St. Francis River at Parkin, Ark., 07047800.............. 10860. St. Francis River at Parkin, Ark., 07047800 (June

through September)..................................... 11061. St. Francis River Floodway near Marked Tree, Ark.,

07047810............................................... 11262. Cross County Ditch near Birdeye, Ark., 07047815.......... 11363. Straight Slough near Birdeye, Ark., 07047882............. 11464. St. Francis Bay at Riverfront, Ark., 07047900............ 11565. St. Francis Bay at Riverfront, Ark., 07047900 (June

through September)..................................... 11766. Clark Corner Cutoff near Colt, Ark., 07047904............ 11967. St. Francis River at Madison, Ark., 07047907............. 12068. L'Anguille River near Cherry Valley, Ark., 07047936...... 12169. L'Anguille River near Colt, Ark., 07047942............... 12270. L'Anguille River near Colt, Ark., 07047942 (June through

September)............................................. 12571. L'Anguille River near Palestine, Ark., 07047950.......... 12872. L'Anguille River at Marianna, Ark., 07047964............. 12973. L'Anguille River at Marianna, Ark., 07047964

(June through September).............................. 13074. St. Francis River north of Helena, Ark., 07047968........ 13175. St. Francis River north of Helena, Ark., 07047968

(June through September)............................... 13276. White River at Oil Trough, Ark., 07061105................ 13377. Black River near Corning, Ark., 07064000................. 13478. Current River near Pocahontas, Ark., 07068850............ 13579. Black River at Pocahontas, Ark., 07069000................ 13680. Black River at Pocahontas, Ark., 07069000 (June

through September)..................................... 13781. Black River at Black Rock, Ark., 07072500................ 13882. Black River at Black Rock, Ark., 07072500 (June

through September)..................................... 14083. Black River at Jacksonport, Ark., 07074490............... 14284. Black River at Jacksonport, Ark., 07074490 (June

through September)..................................... 14385. White River at Newport, Ark., 07074500................... 14486. White River at Newport, Ark., 07074500 (June

through September ).................................... 14687. White River near Augusta, Ark., 07074850................. 14888. White River near Augusta, Ark., 07074850 (June

through September)..................................... 14989. Little Red River at Judsonia, Ark., 07076634............. 15090. Little Red River at Judsonia, Ark., 07076634 (June

through September)..................................... 15191. White River at DeValls Bluff, Ark., 07077000............. 15292. White River at DeValls Bluff, Ark., 07077000

(June through September)............................... 15393. Cache River near Cash, Ark., 07077400.................... 15494. Cache River near Cash, Ark., 07077400 (June

through September)..................................... 155

vi

TABLES (continued)

Page

95. Cache River at Patterson, Ark., 07077500................. 15696. Cache River at Patterson, Ark., 07077500 (June

through September)..................................... 15897. Cache River at Brasfield, Ark., 07077600................. 16098. Bayou DeView near Gibson, Ark., 07077660................. 16199. Bayou DeView near Gibson, Ark., 07077660 (June

through September)..................................... 162100. Bayou DeView at Morton, Ark., 07077700................... 163101. Bayou DeView at Morton, Ark., 07077700 (June

through September)..................................... 165102. Bayou DeView near Brasfield, Ark., 07077750.............. 167103. White River at Clarendon, Ark., 07077800................. 168104. White River at Clarendon, Ark., 07077800 (June through

September)............................................. 170105. White River at St. Charles, Ark., 07077820............... 172106. Big Creek near Watkins Corner, Ark., 07077960............ 173107. Big Creek near Watkins Corner, Ark., 07077960 (June

through September)..................................... 174108. White River at Arkansas Post Canal near

Nady, Ark., 07078285................................... 175109. Arkansas River at Murray Dam, at Little Rock, Ark.,

07263450............................................... 176110. Arkansas River at David D. Terry Lock and Dam below

Little Rock, Ark., 07263620............................ 177111. Arkansas River at David D. Terry Lock and Dam below

Little Rock, Ark., 07263620 (June through September)... 179112. Arkansas River at Lock and Dam 3 near Swan Lake, Ark.,

07263750............................................... 181113. Bayou Meto near Lonoke, Ark., 07264000................... 182114. Bayou Meto near Lonoke, Ark., 07264000 (June through

September)............................................. 183115. Bayou Two Prairie near Cabot, Ark., 07264050............. 184116. Bayou Two Prairie near Cabot, Ark., 07264050 (June

through September)..................................... 185117. Bayou Meto near Bayou Meto, Ark., 07265099............... 186118. Arkansas River at Dam No. 2 near Gillett, Ark., 07265283. 187119. Arkansas River at Dam No. 2 near Gillett, Ark.,

07265283 (June through September)...................... 189120. Water quality of selected rivers in study area............... 191

121-123. Statistical summary of daily discharge and suspended sediment data for:

121. Cache River at Patterson, Ark., 07077500............... 195122. Cache River near Cotton Plant, Ark., 07077555.......... 196123. St. Francis River at St. Francis, Ark., 07040100....... 197

124. Statistical summary of pesticides data for a selected U.S; Army Corps of Engineers station on Whitemans Creek about 4 miles northwest of Trumann, Ark.................... 198

125. Statistical summary of pesticides data for a selected U.S. Army Corps of Engineers station on Eightmile Creek about 5 miles southeast of Paragould, Ark............ 199

vn

TABLES (continued)

Page

126. Bottom-material pesticide quality at selectedlocations in study area.................................... 200

127. Selected water-quality standards and criteria................ 202128. Detected water-quality differences between Little Red

River at Judsonia (0707663*0 and Bayou Two Prairie near Cabot (07264050)...................................... 203

129. Minimum, median, and maximum values of selected water- quality properties for Wattensaw Bayou near Hazen, Ark., 07076950 (water years 1984 through 1987)............. 204

130. Detected water-quality differences between White River at DeVails Bluff (07077000) and Bayou Two Prairie near Cabot (07264050)........................................... 205

131. Detected water quality differences between Arkansas River at David D. Terry Lock and Dam below Little Rock (07263620) and Bayou Meto near Lonoke (07264000)........... 206

132. Detected water-quality differences between Arkansas River at David D. Terry Lock and Dam below Little Rock (07263620) and Bayou Two Prairie near Cabot (07264050)..... 207

133. Detected water-quality differences between Black River at Black Rock (07072500) and Bayou DeView near Gibson (07077660).......................................... 208

134. Detected water-quality differences between Black River at Black Rock (07072500) and Bayou DeView at Morton (07077700)................................................. 209

135. Detected water-quality differences between Black River at Black Rock (07072500) and L'Anguille River near Colt (07047942)............................................ 210

136. Detected water-quality differences between Black River at Black Rock (07072500) and L'Anguille River at Marianna (07047964)..................................... 211

137. Detected water-quality differences between Black River at Black Rock (07072500) and Big Creek near Watkins Corner (07077960).......................................... 212

138. Detected water-quality differences between White River at DeValls Bluff (07077000) and Big Creek near Watkins Corner (07077960).................................. 213

139. Minimum, median, and maximum values of selected water-quality properties for Boat Gunwale Slash near Holly Grove, Ark., 07077862 (water years 1984 through 1987)................... 214

140. Statistical summary of selected water-quality propertiesof water from the alluvial aquifer in potential artificial recharge areas............................................. 215

viii

CONVERSION FACTORS

For use of readers who prefer to use metric (International System) units, rather than the inch-pound units used in this report, the following conversion factors may be used:

Multiply inch-pound unit By

foot (ft) 0.3048

foot per year (ft/yr) 0.3048

cubic foot per second (ft 3 /s) 0.02832

inch (in.) 25.4

million gallon per day (Mgal/d) 0.04381

mile (mi) 1.609

square mile (mi 2 ) 2.590

ton, short 0.9072

ton per day (ton/d) 0.9072

To obtain metric unit

meter (m)

meter per year (m/yr)

cubic meter per second (mVs)

millimeter (mm)

cubic meter per second (mVs)

kilometer (km)

square kilometer (km 2 )

megagram (Mg)

megagram per day (Mg/d)

Temperature in degrees Fahrenheit (°F) as follows:

°F = 1.8 x °C +32

ix

TRENDS AND COMPARISON OF WATER QUALITY AND BOTTOM MATERIAL OF NORTHEASTERN

ARKANSAS STREAMS, 1974-85, AND EFFECTS OF PLANNED DIVERSIONS

By James C. Petersen

ABSTRACT

Water quality of several rivers was statistically summarized and compared. Relative to the other rivers, the Arkansas River is more mineralized but is lower in nutrient, iron, manganese and turbidity values. Bayou Meto and Bayou Two Prairie are relatively high in concentrations of chloride, nitrogen and manganese and relatively low in concentrations of dissolved solids, alkalinity and hardness. The Black River and Current River have the best water quality in the study area. Values of several properties, including nutrients, bacteria, turbidity, and some metals, are lower than in all or almost all rivers in the area. Cache River and Bayou DeView are relatively high in values of turbidity, phosphorus, biochemical oxygen demand, fecal-coliform bacteria, and some pesticides and low in concentrations of dissolved constituents. The St. Francis River is relatively high in suspended sediment concentration. Tributaries of the St. Francis River are relatively high in concentrations of common dissolved constituents, phosphorus, several pesticides and trace metals, and suspended sediment. The White River generally has relatively low concentrations of major dissolved constituents, nutrients, and bacteria.

In bottom material, organochlorine pesticides were detected much more frequently than organophosphorus pesticides. Concentrations tend to be higher in rivers with bottoms of fine-grained particles.

Time trends in data for seven properties were examined using the Seasonal Kendall test. Trends in specific conductance, sodium adsorption ratio, chloride, and phosphorus usually were not detectable. Sulfate concentrations were increasing at approximately one-half of the stations while fecal-coliform bacteria and ammonia concentrations decreased at approximately one-half of the stations.

Most potentially detrimental effects upon water quality resulting from surface-water diversions detected were related to increases of common dissolved constituents. Available data indicate the largest of these increases would be caused by diversion from the Arkansas River.

Use of some surface waters for artificial recharge of the alluvial aquifer may have some detrimental effects upon the recharge systems or the aquifer. Possible effects include injection well and aquifer plugging and unknown effects upon the aquifer as a source of drinking water.

INTRODUCTION

Increased usage of surface water is being considered in response to higher pumping costs due to declining ground-water levels and deterioration of ground-water quality in some areas of northeastern Arkansas. The Eastern Arkansas Region Comprehensive Study is a multi-agency investigation of surface-water and ground-water conjunctive use options and related problems. Two of these options (examined by the U.S. Army Corps of Engineers and the Arkansas Soil and Water Conservation Commission) are diversion of surface water for irrigation and diversion of surface water into wells or surface pits for artificial recharge of ground water. These options include interbasin transfer of surface water. Tasks of the Eastern Arkansas Region Comprehensive Study include a description of existing water and bottom-material quality, assessment of effects of diversion on existing water and bottom-material quality, and assessment of the feasibility of artificial recharge. This report addresses these tasks and was prepared in cooperation with the Arkansas Soil and Water Conservation Commission.

Purpose and Scope

The purposes of this report are to: (1) describe and statistically summarize the water-quality, bottom-material quality, and suspended-sediment and bed-material data from streams and rivers in northeastern Arkansas (fig. 1); (2) assess possible effects of surface-water diversions on existing water- quality conditions in receiving streams; and (3) assess possible effects of use of selected surface waters for artificial recharge of ground water.

The summarization and assessments are based primarily upon data from stations (fig. 2, tables 1-2) operated by the Arkansas Department of Pollution Control and Ecology (ADPCE) and the U.S. Geological Survey collected between October 1, 1974, and September 30, 1985. Properties statistically summarized include discharge, dissolved oxygen, pH, specific conductance, total alkalinity, total hardness, common dissolved constituents, phosphorus, nitrogen, biochemical oxygen demand, bacteria, turbidity, suspended sediment concentration and size fractions, trace metals, pesticides, bed-material size fractions, and pesticides in bottom material. Some data collected at stations (fig. 3) that are not part of the Arkansas Department of Pollution Control and Ecology or U.S. Geological Survey networks were also used.

The most complete summarizations were performed upon water-quality and bottom-material data for surface-water stations that have been operated for at least 6 years during the period October 1974 through September 1985, and for some stations operated for a shorter period of time between 1974 and 1985 as part of a network of sediment-data stations operated for the Corps of Engineers. Less complete statistical summarizations were performed upon data for a few other stations with short periods of record. Data were retrieved from the U.S. Geological Survey's National Water Information System (NWIS) computer data base. ADPCE data are transferred annually into NWIS from the U.S. Environmental Protection Agency's STORET computer data base. Exact location descriptions of all stations can be found in the Geological Survey's annual Water-Data Reports for Arkansas (U.S. Geological Survey, 1976; 1977; 1978; 1979; 1980; 1981; 1982; Lamb and others, 1983; 1984; 1985; 1986).

36°-

20 40 KILOMETERS

I

Figure 1. Location of study area.

r0400 040057

91 C

36

TENNESSEE

35

MISSISSIPPI

1.0. I'd" 1.0 20 30 MILES

10 20 30 KILOMETERS

EXPLANATION

WATER-QUALITY STATION Number is abbreviated station number. For complete station number, prefix number with "07" and add enough zeros to result in eight digits. For example: "07796" changes to "07077960"

Figure 2. Location of water-quality network stations operated byArkansas Department of Pollution Control and Ecology

and U.S. Geological Survey.

EXPLANATION

WATER-QUALITY STATION Numbor IndlcaU* number of Ution* at th» location If

20_______10 MILES

20 3*0 KILOMETERS

<O

Figure 3. Location of water-quality stations that are not part ofArkansas Department of Pollution Control and Ecology or

U.S. Geological Survey networks.

The ADPCE collected and analyzed the water-quality samples at most of the stations (table 1). The U.S. Geological Survey performed all other water- quality sampling and analyses, although some sampling was in cooperation with the Arkansas Geological Commission or the U.S. Army Corps of Engineers. Both laboratories have quality-assurance programs (Friedman and Erdmann, 1982; Arkansas Department of Pollution Control and Ecology, 1986b) and use comparable methods (Guy, 1969; Greeson and others, 1977; Skougstad and others, 1979; Arkansas Department of Pollution Control and Ecology, 1986b; Wershaw and others, 1987).

The statistical summarization includes descriptive distributional statistics and (for a limited number of properties) an analysis of time trends using the Seasonal Kendall trend test. Because much of the agriculture- related usage of surface water would occur during the irrigation season, data collected during June through September were summarized separately. This period corresponds closely with rice and soybean irrigation periods identified by Gilmour and others (1981) and Peralta and Outram (1984).

Study Area Description

The study area is bounded by the Arkansas-Missouri State line on the north, the Mississippi River on the east, the Arkansas River on the south, and the Fall Line between the Coastal Plain and the Interior Highlands on the west (fig. 1). The study area lies entirely within the Mississippi Alluvial Plain physiographic section (Fenneman, 1938). Agriculture is the most common land use in the area. Rice, soybeans, winter wheat, and cotton are the most common crops. Average rainfall ranges from about 47 to 51 inches per year. March, April, and May generally are the wettest months of the year; June, August, and October generally are the driest months (Freiwald, 1985).

Some surface-water quality properties of the Mississippi Alluvial Plain of Arkansas previously have been compared to other physiographic sections in the State (Petersen, 1988). The streams in the Mississippi Alluvial Plain generally are the most turbid in Arkansas. Nutrient and fecal coliform concentrations are some of the largest in Arkansas.

The Mississippi River Valley alluvial aquifer (hereafter referred to as the alluvial aquifer), which underlies the entire study area, is the major source of water for eastern Arkansas. In 1985, approximately 3,000 million gallons per day (Mgal/d) was withdrawn from the alluvial aquifer, mostly for agricultural purposes. Ground-water availability and quality problems are becoming important concerns in parts of the study area (Bryant and others, 1985; Morris and Bush, 1986; Plafcan and Edds, 1986; Plafcan and Fugitt, 1987).

Previous Investigations

Previous investigators have summarized statistically water-quality data in the study area (table 1). Ward (1963) summarized data for nitrate, common dissolved constituents, specific conductance, iron, pH, color, temperature and streamflow from eight stations for the period 1946 through 1960. Jeffus and others (1967) updated Ward's report to include data through 1965. Steele

(1971) presented a more detailed statistical and graphical summary of data for three of the stations summarized by Ward (1963) and by Jeffus and others (1967). Data summaries were chiefly of the same properties but were for the period 1946 through 1969. Petersen (1988) summarized the water quality of streams and rivers in Arkansas and described the relation between specific conductance and selected dissolved constituents and also total alkalinity. Many of the descriptive statistics included in that report are reproduced in this report.

Briggs and Ficke (1977) and Britton and others (1983) summarized statistically stream-quality data from four of the U.S. Geological Survey's National Stream Quality Accounting Network (NASQAN) stations in the study area during the 1975 and 1976 water years. Properties summarized include specific conductance, pH, common dissolved constituents, trace metals, dissolved solids, hardness, nutrients, suspended sediment, turbidity, temperature, fecal coliform and fecal streptococcal bacteria, phytoplankton and periphyton.

The Geological Survey has conducted several nationwide studies of water- quality time trends at NASQAN stations using the Seasonal Kendall trend test (Crawford and others, 1983), a nonparametric test that considers seasonal and streamflow effects on water quality. A study of trends during 1972 through 1979 of total phosphorus measurements at NASQAN stations (Smith and others, 1982) included four stations on the Arkansas River. There was no trend in raw phosphorus concentrations, nor in flow-adjusted phosphorus concentrations. Phosphorus transport either decreased or there was no significant trend. Trend analyses for water years 1975 through 1981 of raw and flow-adjusted values of several properties at NASQAN stations, including four in the study area, were conducted by Smith and Alexander (1983, 1985). Stoner (1985) detected increasing flow-adjusted dissolved-solids concentrations for water years 1968 through 1982 at two of the three stations (Arkansas River at Dam 13 near Van Buren and Arkansas River at David D. Terry Lock and Dam below Little Rock) on the Arkansas River.

Wells and Schertz (1983) summarized daily temperature, conductance, streamflow and monthly dissolved solids data for water years 1972 through 1981 for six NASQAN stations in the study area. Daily dissolved oxygen and pH data were summarized for one of the six stations.

The ADPCE periodically publishes a water-quality inventory report (Arkansas Department of Pollution Control and Ecology, 1974; 1975; 1976; 1977; 1980; 1982; 1984; 1986a). These reports summarize annual water-quality data by water-quality planning segments or occasionally by station. The 1984 and 1986 reports include time trends calculated by linear regression of water quality and time for data collected during February, March, and April, and during July, August, and September. Mean, standard deviation, and maximum and minimum values also are reported. Properties summarized include temperature, dissolved oxygen, pH, dissolved chloride, dissolved sulfate, dissolved solids, total phosphorus, total nitrite plus nitrate, turbidity, trace metals, and fecal coliform bacteria. The 1980 report compares the 1969 through 1974 means with the 1975 through 1979 means of several properties at individual stations.

Several investigations of surface-water quality have yielded specific data, generally collected during a short period of time. Reports describing

these investigations include Lamb (1978a, 1978b); Bryant and others (1979); Lamb (1979); Lamb and Newsom (1979); Petersen (198la, 198lb); Bennett and others (1987); Giese and others (1987); and Shateri-Mirabadi (1987).

Acknowledgments

Jeff J. Atkins of the Memphis District of the U.S. Army Corps of Engineers provided unpublished water-quality data. Kenneth M. Bright of the Memphis District of the U.S. Army Corps of Engineers and Barry J. Bruchman of the Vicksburg District of the U.S. Army Corps of Engineers provided maps and descriptions of locations of proposed surface-water diversions.

DATA SUMMARIZED

The properties summarized were selected on the basis of the number of analyses available, environmental or water-use significance, and data variability. The ADPCE and the U.S. Geological Survey water-quality data summarized in this report previously have been assigned parameter code numbers and stored in the U.S. Environmental Protection Agency's STORET and the Geological Survey's NWIS computerized data bases. The properties (parameters), associated parameter codes, and water years summarized are listed in table 2.

Sample collection methods of the Geological Survey and ADPCE differ. Most samples collected by the Geological Survey are composite cross-sectional samples collected by using the equal transit rate method (Guy and Norman, 1970). One station (Black River at Black Rock) is sampled by collecting a single or point sample near the river bank. ADPCE collects samples at midstream, or at quarter points, and at middepth or 5 feet, whichever is less (Arkansas Department of Pollution Control and Ecology, 1986b).

Values for some similar properties were combined. Values of laboratory- measured total alkalinity and field-measured total alkalinity were considered to be equivalent. When mean daily discharge values were available and instantaneous discharge values were unavailable, the mean daily values were substituted for the instantaneous discharge values.

The Geological Survey and ADPCE currently use different methods for analysis of both fecal coliform and fecal streptococcal bacteria. These results are stored in NWIS using different parameter codes. The codes and a brief description of the differences in methods are listed below:

31616 (fecal coliform bacteria) - 0.45 micrometer pore-diameter filter 31625 (fecal coliform bacteria) - 0.7 micrometer pore-diameter filter 31679 (fecal streptococcal bacteria) - m-enterococcus agar 31673 (fecal streptococcal bacteria) - KF agar.

Fecal coliform bacteria counts using a 0.7 micrometer filter typically are higher than counts using a 0.45 micrometer filter (G.E. Mallard, U.S. Geological Survey, oral commun., 1985). Because counts resulting from the two fecal coliform methods are not comparable and because the fecal streptococcal counts may not be comparable, data were not combined.

8

The discharge data summarized in the tables are for instantaneous or mean daily measurements that correspond to a water-quality sample. Therefore, these measurements rarely, if ever, include measurements of the actual maximum or minimum discharges. For several stations, statistical summaries (monthly and annual) of continuously measured discharge are available in the U.S. Geological Survey's annual Water-Data Reports (U.S. Geological Survey, 1976; 1977; 1978; 1979; 1980; 1981; 1982; Lamb and others, 1983; 1984; 1985; 1986).

At stations that are part of the network of sediment stations operated for the U.S. Army Corps of Engineers in the St. Francis River basin (table 1), main-channel and overbank water often were sampled separately. Discharge and water-quality data for main-channel and overbank samples were not combined into single values.

At most stations, dissolved oxygen measurements were made during routine sampling visits. However, data included for some stations are nighttime measurements made during more intensive studies. Nighttime dissolved oxygen concentrations often are less than daytime concentrations. Stations for which nighttime dissolved oxygen concentration data (Bryant and others, 1979) were included are L'Anguille River near Colt (07047942) and L'Anguille River at Marianna (07047964).

At several U.S. Geological Survey stations during 1985, water samples were collected nearly simultaneously at numerous cross-section locations at each station. Values of pH, dissolved oxygen concentration, specific conductance, and suspended-sediment concentrations associated with these cross-section samples were determined and are stored in NWIS. These values were not included in the statistical analyses for this report.

Some suspended-sediment and bed-material particle-size data were generated after the available data were retrieved from NWIS. These data were generated when the percent suspended sediment or bed material for a given particle size was 100, thereby making reporting of percentages for larger particle sizes redundant. For example, if the reported value for suspended sediment, fall diameter percent finer than 0.250 millimeter (mm) was 100 percent, the values for percent finer than 0.50 mm and 1.00 mm were changed from not reported to 100 percent for statistical purposes.

CALCULATION AND REPORTING OF DESCRIPTIVE STATISTICS

P-STAT 1 (P-STAT, Inc., 1986) and the UNIVARIATE procedure of the Statis tical Analysis System (SAS Institute, 1982a and 1982b) were used for calcu lation of the descriptive statistics. The Statistical Analysis System was also used to prepare many of the tables. The data sets summarized commonly contained a large number of values reported as "less than" some value, that value being the analytical detection limit. These data are referred to as "censored" data. This necessitated using some method for estimation of the mean and standard deviations of data sets containing censored data. Several

Use of a firm name in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey.

methods have been compared (Gilliom and Helsel, 1986; Helsel and Gilliom, 1986). These authors reported that the best of the methods evaluated for the estimation of mean and standard deviation assumes that censored data follow the zero-to-detection limit part of a log-normal distribution fit to observations above the detection limit by least-squares regression. A procedure using this method for estimating means and standard deviations has been developed (Helsel and Cohn, 1988) and was used for estimating these values. Because of the uncertainty involved with estimating means and standard deviations when censored values compose greater than about 75 percent of the total values, estimated mean and standard deviation are not reported when greater than 75 percent of data are censored.

Values of several of the summarized properties have been reported in the published literature as zero. For many properties, detection limits have changed during the period 1975 through 1985. To make the data for a station more uniform and because it was required for the estimation of means and standard deviations, the greatest detection limit for each property was determined and used. All values less than this detection limit (DL) were changed to <DL (less than DL). For example, if detection limits of 1 and 2 were used during the period of summary, values of <1 and 1 were changed to <2. These properties and detection limits are shown in table 3.

Censored values also are reported for bacteria analyses but, because the detection limit is dependent on the volume of sample filtered, the number of detection limits can be relatively large. Therefore, bacteria values reported as less than some number were arbitrarily multiplied by 0.5 and treated as uncensored for the statistical analysis. The procedure for estimation of means and standard deviations of censored data was not used for analyzing bacteria data. Bacteria count values also can be reported as "greater than" or "nonideal plate count." Values qualified by these two remarks were set equal to the unremarked value for calculation of all statistics. Because means and standard deviations are the most likely statistical parameters to be biased by these procedures, they are not reported in the tables.

In the summary tables, the minimum, median, maximum, and quartiles may be shown as less than some number. This can be used to approximate the number of censored values in the data set. For example if the minimum and 25th percentile values are reported as "<" some number, then between 25 and 50 percent of the data were either censored values or detected values less than the greatest detection limit used during the summary period.

WATER-QUALITY TIME TRENDS

Testing historical water-quality data for time trends is another component of water-quality data examination. Although historical trends may not persist into the future, knowledge of their existence, particularly when coupled with possible causal factors, can be helpful to water managers.

Methods

The Kendall's Tau test (Kendall, 1975) is the basis of the Seasonal Kendall test used in water-quality trend testing (Smith and others, 1982).

10

Both tests are nonparametric tests and do not require that data are distri buted normally. Because water-quality data can vary seasonally the Seasonal Kendall test compares data only with other data collected during the same "season." In this study, the water year was divided into six seasons of approximately 61 days beginning on October 1. In the Seasonal Kendall test used in this study median values are computed for each season. These medians are then ranked within season and compared with all other medians in the same season. If the number of comparisons with larger medians occurring later in time (x.) minus the number of comparisons with larger medians occurring earlier in time (x ) is sufficiently different from zero (x.-x,^0) a statistically significant trend exists.

Water quality varies with discharge. For example, total phosphorus concentration may increase or decrease as discharge increases depending upon the relative influence of factors such as erosion and dilution. Thus a detected trend in water quality may be the result of changing discharge resulting from climatic conditions (Smith and others, 1982).

The relation between discharge and water quality can often mask or enhance trends resulting from changes in processes (such as land use and point-source water discharge) affecting introduction of water-quality constit uents into streams. Because it generally will be at least as important to examine trends resulting from processes affecting the introduction of phospho rus, for example, into a stream as it is to examine trends in phosphorus con centration, a flow-adjustment procedure was used to look for trends in flow- adjusted concentrations. Flow-adjusted concentrations are less affected by climate, and therefore, relatively more affected by processes affecting introduction of constituents into streams.

Several common regression models (Crawford and others, 1983) were used for flow adjustment:

A

C = a + bQ linear (1)A

C = a + b(lnQ) log-linear (2)A

C = a -i- b(1/Q) inverse (3)2 C = a -i- b.Q + bpQ quadratic (4)

A

In C r a + b(lnQ) log-log (5)A p

In C = a + b^lnQ) + b2 (lnQ) log-quadratic log (6)A

C = a -i- b ___1 hyperbolic 1-hyperbolic 8 (7-14) (1+BO/Q))

^

where C = predicted concentrationa = intercept of the regression lineb = slope of the regression lineQ = discharge

B = 10"x to 10 ( ~ x"*" 3 * 5\ where x is equal to 2.5 + integer of Iog 10 of

the mean discharge (Crawford and others, 1983; German and Schiffer,

1988) and is incremented by 10 seven times. (Hyperbolic 1 for B = 10"X to hyperbolic 8 for B = 10*~x"*"3 ' 5) .

11

The most appropriate of the 14 models was selected by the following criteria:

(1) Probability value of the F or t statistics associated with the regression must be <0.10.

(2) Plot of residual versus predicted concentration indicates that the variance is relatively constant throughout the range of predicted concentration. The residual is the difference between the actual value of the dependent variable and the dependent variable value predicted by the regression model. 2

(3) Equation with largest value of coefficient of determination (r ) of equations meeting the first two criteria is selected. However, r values of models based on log concentration (equations 5 and 6) were not compared with the values from models based on concentration. In this case the model that best met criterion 2 was selected.

After the flow-adjustment model was selected, the residuals were tested fortrend with the Seasonal Kendall test.

Some of the data analyzed with the Seasonal Kendall test were modified so they could be used in the test. Some values of dissolved sulfate, fecal- col i form bacteria, total phosphorus, and total ammonia were censored data; they were reported as less than some detection limit. These values were set equal to one-half the detection limit. Because (except for the fecal coliform bacteria data) detection limit values often decreased during the study period, the presence in a data set of more than one detection limit may introduce a slight decreasing trend bias to the Seasonal Kendall test. At each station, the influence of these censored data was evaluated graphically by plotting concentration against time and highlighting the values reported as less than the detection limit. Factors considered were actual number of values reported as less than each detection limit, temporal distribution of these values, the distribution of concentration values with time (i.e., the magnitude and slope of the trend), and the trend probability calculated by the Seasonal Kendall test. The percent of actual censored values was small (generally less than 5 percent) and the number of censored data which differed from other censored data because of the detection limit was extremely small. This graphical evaluation indicated that the censored data did not substantially affect trend results (except for total ammonia at Current River near Pocahontas, table 16). Fecal-coliform bacteria values were also censored as estimated, greater than, and non-ideal plate count values. These values were deleted, used as reported, and used as reported, respectively. If the censored concentration data-discharge data pairs to be used for flow adjustment exceeded 5 percent of the concentration data-discharge data pairs, no flow adjustment was attempted (except for fecal-coliform bacteria) because of the potential invalidity of the resulting flow-adjustment model.

To estimate the magnitude of identified trends the Seasonal Kendall Slope Estimator (Smith and others, 1982) was calculated. This value is the median of the differences (expressed as slopes per year) of the pairs of data values used in the Seasonal Kendall test. It is an estimate of the trend rate of increase or decrease and for many water-quality properties is expressed as mg/L per year.

Trends in water-quality data were tested only when data were available for 5 or more years. These years often were not consecutive.

12

Specific Conductance

At most stations statistically significant (p<0.10) trends in specific conductance or flow-adjusted specific conductance were not detected in January through December data or in June through September data (tables 4-40). The four stations (White River at Oil Trough, 07061105; White River near Augusta, 07074850; Little Red River at Judsonia, 07076634; and Cache River near Cash, 07077400) for which a significant trend in the raw January through December data was detected are clustered near the central part of the northwestern border of the study area (fig. 2). The trends of data at these four stations were increasing at rates of approximately 3 to 10 microsiemens per centimeter per year. Very few trends were detected in other data.

Sodium Adsorption Ratio

At most stations statistically significant (p<0.10) trends in sodium adsorption ratio or flow-adjusted sodium adsorption ratio were not detected in January through December or in June through September data (tables 4-40). The most significant trends (p<0.01) were the downward trends detected in raw (0.25 units per year) and flow-adjusted January through December data for Arkansas River near Gillett (07265283). Only 10 stations had sufficient data for trend testing.

Dissolved Sulfate

Data for a relatively large number of stations indicate increasing dissolved sulfate concentrations (tables 4-40). Statistically significant (p<0.10) increasing trends of raw concentrations in January through December (approximately 0.2 to 1.6 mg/L per year) were detected at 17 of 37 stations. A decreasing trend was detected at only one station, Tyronza River near Twist (07047700). The 17 stations were scattered throughout all but the central section of the eastern part of the study area. The percentage of stations where no detectable trends were identified is much larger when data are flow adjusted or were collected in June through September.

Dissolved Chloride

At most stations statistically significant (p<0.10) trends in dissolved chloride were not detected (tables 4-40). Significant increasing trends were more common than decreasing trends in raw and flow-adjusted concentrations in January through December and in June through September data.

Fecal-Coliform Bacteria

At nearly one-half (17 of 37) of the stations a statistically significant (p<0.10) decreasing trend in January through December raw fecal-coliform bac teria concentrations (approximately 4 to 130 colonies per 100 mL per year) was detected (tables 4-40). These stations are distributed homogeneously through out the study area. Similar results were found when flow-adjusted data and June through September data were analyzed. No increasing trends were detected.

13

Total Phosphorus

At most stations (about 75 percent) significant (p<0.10) trends in raw or flow-adjusted total phosphorus concentration were not detected (tables 4-40). Statistically significant trends were not detected in the flow-adjusted June through September data at the three stations tested. For each type of data tested there was an equal number of stations with significant increasing and decreasing trends. In general, stations with significant decreasing trends are in the eastern part of the study area and stations with significant increasing trends are in the western part of the study area.

Total Ammonia

Statistically significant increasing trends in total ammonia were seldom detected (tables 4-40). Significant decreasing trends in raw January through December data (approximately 0.005 to 0.07 mg/L per year) were detected at 18 of 33 stations. These stations are distributed homogeneously throughout the study area. Decreasing trends in raw June through September data were detected at 4 of 17 stations. Flow-adjusted concentrations were calculated for only one station, Cache River near Cash.

TRENDS AND COMPARISON OF WATER QUALITY OF STREAMS

Water-quality data for stations operated at least 6 years between October 1974 and September 1985 and sediment-data stations operated during the period are summarized in tables 41-119. Substantial differences in water quality exist. Many water-quality properties are influenced by hydrologic, geologic, and land use differences.

Water-quality stations on the (1) Arkansas River mainstem, (2) Bayou Meto and Bayou Two Prairie, (3) Black River and Current River, (4) Cache River and Bayou DeView, (5) St. Francis River mainstem, (6) St. Francis River tributaries, and (7) White River mainstem were grouped together to assess differences in water quality between these groups. Typical (median) values and generalized time trend information of selected water-quality properties for each of these station groupings are shown in table 120 and are discussed below.

Arkansas River

Typical specific conductance, dissolved sulfate, dissolved chloride, and dissolved solids values are higher in the Arkansas River than in any other river group. Total phosphorus, biochemical oxygen demand, turbidity, iron, and manganese values are lower than values of most other groups. Available data indicate that the Arkansas River has lower concentrations of suspended sediment and higher percentages of sand-sized or larger particles than the other groups.

In general, time trends were not statistically significant (p<0.10) for specific conductance, dissolved sulfate, dissolved chloride, and total

14

phosphorus values. Total ammonia concentrations decreased and fecal-coliform bacteria concentrations decreased or did not change significantly.

Bayou Meto-Bayou Two Prairie

Typical dissolved chloride, total ammonia, total nitrite plus nitrate, and total recoverable manganese concentrations are higher in Bayou Meto and Bayou Two Prairie than in most other river groups. Dissolved chloride concentrations generally are exceeded only by concentrations in the Arkansas River. Dissolved chloride concentrations are substantially larger at the station at Bayou Meto near Lonoke than at the other two stations in this group. Dissolved solids concentrations generally are lower in this group than in any other river group. Specific conductance, total alkalinity, and total hardness values are comparable to values in the Cache River-Bayou DeView group and lower than in all other groups.

In general, time trends were not significant (p<0.10) for specific conductance, dissolved chloride, total phosphorus, total ammonia, and fecal- coliform bacteria. Sulfate concentrations generally increased.

Black River-Current River

This river group, by several measurements, has the best typical water quality in the study area. Typical biochemical oxygen demand, fecal-coliform bacteria, turbidity, and total recoverable zinc values are lowest in this group. Dissolved sulfate, dissolved chloride, total phosphorus, total ammonia, and total recoverable iron concentrations are comparable to those in the White River and lower than in any other group.

In general, time trends were not significant (p<0.10) for specific conductance, dissolved chloride, total phosphorus, and fecal-coliform bacteria. Generally, dissolved sulfate concentrations increased and total ammonia concentrations decreased during the study period.

Cache River-Bayou DeView

Typical values of turbidity, total recoverable manganese, total 2,4-D, and percent of sediment finer than 0.062 mm (silt or clay) are higher in this river group than in other river groups. Dieldrin concentrations were highest in this group and in the St. Francis River tributaries group. Total phospho rus, biochemical oxygen demand, and fecal-coliform bacteria values generally are higher in this group than in most other groups in the study area. Speci fic conductance, total alkalinity, and total hardness values are comparable to values in the Bayou Meto-Bayou Two Prairie group and lower than in all other groups.

Daily sediment data have been collected since April 1987 at Cache River at Patterson (07077500) and Cache River near Cotton Plant (07077555). Data for water year 1988 are summarized in tables 121-122. Values of water discharge, suspended sediment concentration, and suspended sediment discharge are not normally distributed. High (relative to median values at the two

15

stations) discharges, suspended sediment concentrations, and suspended sediment discharges occur infrequently and during flood events. For example, in water year 1988, about 22 percent of the annual sediment discharge at Patterson occurred between December 24, 1987, and January 4, 1988, and about 15 percent of the annual sediment discharge at Cotton Plant occurred between December 26, 1987, and January 3, 1988. Annual suspended sediment discharges at Patterson and Cotton Plant were 96,800 and 78,500 tons, respectively.

In general, time trends were not statistically significant (p<0.10) for specific conductance and total phosphorus. Trends in dissolved sulfate and chloride concentrations increased or no significant trends were detected. Significant decreasing trends generally were detected in total ammonia and fecal-coliform bacteria concentrations.

St. Francis River

In general, typical concentrations of total recoverable iron and zinc are highest in this river group. Highest suspended sediment concentrations typically are found in the St. Francis River and its tributaries. Chloride concentrations in the St. Francis River are lower and biochemical oxygen demand concentrations are higher than in most other groups.

Daily sediment data have been collected since February 1985 at St. Francis River at St. Francis, 07040100. Data for water years 1986 through 1988 are summarized in table 123. Values of discharge, suspended sediment concentration, and suspended sediment discharge are not normally distributed. Extremely high (relative to median values at this station) discharges, suspended sediment concentrations, and suspended sediment discharges occur infrequently during flood events. For example, about 22 percent of the total sediment discharge during water year 1986 occurred on March 12 through 14 and May 15 through 17. Also, approximately 1,510,000 tons of sediment passed the station during the 3-year period and nearly 3 percent (43,200 tons) was discharged on a single day.

In general, statistically significant (p<0.10) time trends were not detected for specific conductance and total phosphorus. Mixed trends were detected for dissolved sulfate (increasing or no trend), dissolved chloride (increasing or no trend), and fecal-coliform bacteria (decreasing or no trend). Ammonia concentrations generally decreased.

St. Francis River Tributaries

Typical specific conductance, dissolved sulfate, and dissolved solids values generally are higher for this river group than values for all groups except the Arkansas River. Typical total phosphorus, total dieldrin, and total 2,4-D concentrations generally are higher than values for all groups except the Cache River-Bayou DeView. Highest suspended sediment concentra tions typically are found in the St. Francis River and its tributaries. Generally, biochemical oxygen demand, turbidity, total recoverable iron, total recoverable manganese, and total recoverable zinc values are higher than values for most other groups.

16

Time trends were not statistically significant (p<0.10) for specific conductance and total ammonia, and generally were not significant for dissolved sulfate, dissolved chloride, and total phosphorus. Time trends generally were not significant or were decreasing for fecal-coliform bacteria.

White River

Typical dissolved sulfate, dissolved chloride, total phosphorus, total ammonia, total nitrite plus nitrate, fecal-col iform bacteria, turbidity, and total recoverable iron values for this river group are comparable to values of the Black River-Current River group and generally are lower than all other groups. Total alkalinity concentrations are relatively high.

In general, time trends were not statistically significant (p<0.10) for specific conductance, dissolved chloride and total phosphorus. Trends were either not significant or decreasing for fecal-col iform bacteria. Generally, dissolved sulfate concentrations increased and total ammonia concentrations decreased.

PESTICIDES IN BOTTOM MATERIAL

Compared to the amount of pesticides data available for water samples there is a limited amount of pesticide data available for bottom material. Bottom material has been sampled to determine pesticide concentrations for varying periods of time at six network stations operated by the U.S. Geological Survey. These stations are:

St. Francis River at Parkin, 07047800 (tables 59-60) L'Anguille River near Colt, 07047942 (tables 69-70) Black River at Black Rock, 07072500 (tables 81-82) Cache River at Patterson, 07077500 (tables 95-96) Bayou DeView at Morton, 07077700 (tables 100-101) White River at Clarendon, 07077800 (tables 103-104)

Other pesticide data are available for the L'Anguille River and tributaries (Bryant and others, 1979); Larkin Creek and its tributaries (Petersen, 198la); Flat Bayou (Lamb, 1979); Patton Lake (Petersen, 198lb); Tyronza River (Lamb, 1978a); Village Creek (Lamb, 1978b); Whitemans Creek (Jeff J. Atkins, U.S. Army Corps of Engineers, written commun., 1988) given in table 124; and Eightmile Creek (Jeff J. Atkins, U.S. Army Corps of Engineers, written commun., 1988) given in table 125. Stations are located on figure 3.

Organochlorine pesticides were detected in bottom material more frequently than organophosphorus pesticides (table 126). This is probably the result of greater environmental persistence and lower solubility of the organochlorine pesticides.

Available data indicate differences in concentrations of pesticides in bottom material from different parts of the study area (table 126). Concen trations of pesticides in bottom material appear to be highest in rivers that have bottom materials composed of finer particles, for example, the L'Anguille River (tables 69-70) and Bayou DeView (tables 100-101) and lowest in rivers with bottom materials of coarser particles such as the St. Francis River (tables 59-60) and the White River (tables 103-104).

17

The highest typical concentrations of pesticides occurred in Flat Bayou. Median concentrations of ODD, DDE and DOT were 76, 100, and 13 micrograms per kilogram (jig/kg), respectively. Other pesticides detected in at least 50 percent of samples were aldrin, dieldrin, endrin, and heptachlor epoxide.

The second highest typical concentrations of pesticides occurred in the L'Anguille River at Colt. These concentrations are similar to those that occurred at several locations in the L'Anguille River basin (Bryant and others, 1979; Petersen, 198la). Median concentrations of ODD, DDE, and DOT at the Colt station were 17, 16, and 5.6 ng/kg, respectively. Other pesticides detected in at least 50 percent of samples at Colt were aldrin, dieldrin, and endrin.

Typical concentrations for Bayou DeView at Morton generally are lower than those for Flat Bayou or the L'Anguille River but higher than at other locations. Median concentrations of ODD, DDE, and DOT were 9.3, 7.6, and 5.6 Hg/kg, respectively. Aldrin was also detected in at least 50 percent of the samples.

Typical concentrations of pesticides in the Village Creek basin, Cache River, the Tyronza River basin, and Black River generally ranged from 0.1 to 5 jig/kg of DDD, DDE, DOT, and dieldrin. Other pesticides usually were detected in less than 50 percent of samples.

Typical concentrations of nearly all pesticides were below detection limits in the St. Francis and White Rivers (table 126). Only dieldrin in the St. Francis River was detectable in at least 50 percent of samples.

COMPARISON OF DATA WITH WATER-QUALITY CRITERIA AND STANDARDS

The 75th percentile (25th percentile for dissolved oxygen) for each property at each station was compared to water-quality criteria and standards (table 127). For several properties, reporting limits exceeded criteria or standards and therefore comparisons could not be made.

Commonly Unmet Criteria and Standards

Values for six properties frequently (at least 25 percent of samples) exceeded criteria or standards at greater than one-third of the stations. The properties are iron, total phosphorus, fecal-coliform bacteria, turbidity, lead and copper.

Iron

The criterion for iron (1,000 micrograms per liter (ng/L)) was not met by at least 25 percent of the samples at nearly all (about 90 percent) stations. The stations that most often met the criterion for iron generally are near where the rivers enter the Coastal Plain.

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Total Phosphorus

The guideline for total phosphorus (0.10 mg/L) was not met by at least 25 percent of the samples at about 80 percent of the stations. The stations that most often met the phosphorus guideline generally are near the boundary of the Coastal Plain.

Fecal-Coliform Bacteria

The standard for fecal col iform bacteria (geometric mean of 200 colonies per 100 mL between April 1 and September 30) may often be exceeded. January through December data indicate that bacteria concentrations exceeded 200 colonies per 100 mL in at least 25 percent of the samples collected at about two-thirds of the stations.

Turbidity

At approximately 40 percent of the stations the applicable turbidity criterion was exceeded in at least 25 percent of the samples. This criterion is not to be exceeded as the result of waste discharge or instream activity (Arkansas Department of Pollution Control and Ecology, 1988).

Lead and Copper

Lead and copper concentrations frequently may exceed acute or chronic freshwater aquatic-life criteria (table 127). However the concentrations recommended in these criteria are dependent on water hardness. Lead and copper concentrations arbitrarily were compared to criteria based on a water hardness of 100 mg/L. Using this comparison, at least one-third of the stations exceeded the copper criterion and at least two-thirds of the stations exceeded the lead criterion at least 25 percent of the time. Detection limits frequently were greater than the chronic freshwater aquatic-life criteria; this also prevented a more accurate estimation of the number of stations at which criteria frequently were exceeded.

Comparisons by River

The water quality of the six rivers sampled at three or more stations (Arkansas River, Bayou DeView, Black River, Cache River, St. Francis River, and White River) was compared individually to applicable standards or criteria. The 75th percentile again was used in comparisons with the standards or criteria.

Arkansas River

The water-quality standards or criteria frequently (in excess of 25 percent of samples) exceeded at the most Arkansas River stations were the

19

phosphorus and lead criteria and the fecal coliform standard (based on January through December data). The phosphorus and lead criteria frequently were not met at all four stations.

Bayou DeView

The water-quality standards or criteria frequently exceeded at the most Bayou DeView stations were for phosphorus, iron, turbidity, and dissolved oxygen. These four criteria or standards frequently were not met at all three stations. The lead criterion and the fecal-coliform standard (based on January through December data) frequently were exceeded at two stations. The copper and dieldrin criteria frequently were exceeded at one station.

Black River

The iron criterion frequently was exceeded at two of the three stations on the Black River. The phosphorus guideline, lead criterion, and the fecal- coliform standard (based on January through December data) frequently were exceeded at one of the three stations.

Cache River

Several criteria or standards frequently were exceeded at all three stations on the Cache River. These were the phosphorus guideline, iron criterion, turbidity standard, and the fecal-coliform standard (based on January through December data). The lead criterion frequently was exceeded at two of the three stations. The copper criterion frequently was exceeded at one station.

St. Francis River

The phosphorus guideline and the iron criterion frequently were exceeded at all five stations on the St. Francis River or St. Francis Bay. The fecal- coliform standard (based on January through December data) was exceeded frequently at three stations. The turbidity standard and the copper criterion frequently were exceeded at two stations. The dissolved solids standard and lead criterion frequently were exceeded at one station.

White River

At most stations on the White River the iron criterion and the phosphorus guideline frequently were exceeded. The iron criterion frequently was exceeded at six of the seven stations. The phosphorus guideline frequently was exceeded at five of the seven stations. The lead criterion frequently was exceeded at two of the stations. The fecal-coliform standard (based on January through December data) frequently was exceeded at two of the seven stations. The copper criterion and the turbidity standard frequently were exceeded at one of the seven stations.

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EFFECTS OF DIVERSIONS ON WATER-QUALITY

Diversions of surface water from one stream into another may affect the water quality of the receiving stream. The quality of surface water diverted for artificial recharge of ground water may affect the recharge process and the aquifer.

Diversions to Other Streams

As part of the East Arkansas Region Comprehensive Study several possible surface-water diversions are being evaluated (figs. 4-5). These diversions include:

(1) Diversion from the Little Red River near West Point south into an area north of Bayou des Arc

(2) Diversion from the White River near Des Arc north into tributaries of Bayou des Arc and south into Wattensaw Bayou

(3) Diversion from the White River near DeValls Bluff West to the Bayou Two Prairie area and south to the DeWitt and Stuttgart areas

(4) Diversion from the Arkansas River near David D. Terry Lock and Dam east into Indian Bayou, Salt Bayou, Bayou Two Prairie, Bayou Meto, and Wattensaw Bayou

(5) Diversion from the Black River downstream of the Spring River near Black Rock southeast into Bayou DeView, Brushy Creek, the L'Anguille River, and Big Creek and its tributaries

(6) Diversion from the White River north of DeValls Bluff east into Big Creek and its tributaries.

The potential water-quality effects of these diversions were evaluated by use of the Wilcoxon-Mann-Whitney rank sum test, a two-sample t-test on ranked data (Iman and Conover, 1983; P-STAT, Inc., 1986). The null hypothesis is that the differences between the means of the two compared stations is zero. All properties that are listed in the descriptive statistical summary tables for both stations of interest were compared using the rank sum test. Water quality at stations near diversion points was compared with water quality at stations on receiving streams near the diverted surface-water discharge points. Some effects could not be evaluated in this manner because of the absence of a station near the diversion or discharge points. Alternate procedures included t-test comparisons between more-distant stations and simple comparison of median values.

The diversion from the Little Red River was evaluated by comparison of water-quality data for Little Red River at Judsonia (07076634) with data for Bayou Two Prairie near Cabot (07264050) and data collected for Ten Mile Creek (fig. 3) by the ADPCE as part of a least-disturbed reference stream study (Bennett and others, 1987; Giese and others, 1987). Long-term data at more representative receiving streams were not available.

The diversion from the White River near Des Arc was evaluated by comparison of data from three stations. Data for White River near Augusta (07074850) and White River at DeValls Bluff (07077000) were compared with a station operated since November 1983 by ADPCE, Wattensaw Bayou near Hazen (07076950).

21

92'OQ 1 91'50'

Arc _ _. _To Big Creek

07076850 __ ^ See" " Figure 5

07263620

EXPLANATION

PROPOSED NEW CHANNEL

^- ̂ - DIRECTION OF FLOW

07076g50

V WATER-QUALITY STATION AND IDENTIFICATION

10 20 30 KILOMETERS

3|0 MILES

Figure 4. Location of proposed surface-water diversions from theLittle Red, White, and Arkansas Rivers and nearby

water-quality stations.

22

077660

07077960

EXPLANATION

PROPOSED NEW CHANNEL

DIRECTION OF FLOW

WATER-QUALITY STATION AND IDENTIFICATION

1.0 20

10 20 30 KILOMETERS

30 MILES

Figure 5. Location of proposed surface-water diversions from the White and Black Rivers and nearby water-quality stations.

23

The westward diversion from the White River near DeValls Bluff was evaluated by comparison of data from two stations. Data for White River at DeValls Bluff (07077000) was compared with Bayou Two Prairie near Cabot (07264050).

The diversion from the Arkansas River near David D. Terry Lock and Dam was evaluated by comparing data from three stations. Data for Arkansas River at David D. Terry Lock and Dam below Little Rock (07263620) was compared with data for Bayou Meto near Lonoke (07264000) and Bayou Two Prairie near Cabot (07264050).

The diversion from the Black River near Black Rock was evaluated by comparing data from six stations. Data for Black River at Black Rock (07072500) was compared with data for Bayou DeView near Gibson (07077660), Bayou DeView at Morton (07077700), L'Anguille River near Colt (07047942), L'Anguille River at Marianna (07047964), and Big Creek near Watkins Corner (07077960).

The diversion from the White River east into Big Creek and its tributaries was evaluated by comparing data from three stations. Data for White River at DeValls Bluff (07077000) was compared with data for Big Creek near Watkins Corner (07077960) and Boat Gunwale Slash near Holly Grove (07077862).

Scope of Assessment of Effects of Diversions

The scope of the following assessment is restricted due to the limited availability of data. All of the stations used as a measure of receiving stream water quality, except Wattensaw Bayou near Hazen (07076950) and Boat Gunwale Slash (07077862), are downstream of nearby sewage treatment plant effluents. Nutrients, dissolved constituents, bacteria and metals concentrations may be increased by these effluents. Many water-quality properties have not been measured routinely at stations within the study area. Although several pesticides are summarized in preceding tables there are many which are not. Pesticides used upon at least 40 percent of acreage in rice, soybean, or cotton production (Waldrum, 1984; Waldrum, 1986; and J.D. Waldrum, Arkansas Cooperative Extension Service, written commun., 1989) but not routinely measured include propanil, trifluralin, bentazon, fluometuron, norflurazon, MSMA, and cypermethrin. At many stations there are no data for pesticides in bottom material.

Streamflow may affect the water quality of the originating and receiving rivers. Potential changes of water quality may result from suspension of bottom materials, changes in particle-size distribution, changes in aeration rates, and changes in water velocity and travel times.

The assessments primarily were based upon median values. Actual water- quality effects also will include those resulting from water-quality conditions not characterized by the median. That is, infrequently occurring water-quality conditions were not considered.

24

The potential effects of construction and operation activities also were not considered. These activities may include dredging, channelization, bank stabilization, and other related activities.

Diversion from Little Red River near West Point

Comparison of data for Little Red River at Judsonia and Bayou Two Prairie near Cabot (table 128) indicated that the water quality in the Little Red River may exceed the water quality in the area north of Bayou des Arc (fig. 4). Alkalinity is slightly higher in Bayou Two Prairie and diversion may make the streams north of Bayou des Arc slightly less buffered against pH fluctuations. The Little Red River has higher concentrations of dissolved oxygen and lower values of several dissolved constituents, nutrients, fecal coliform bacteria, turbidity, iron, manganese, and toxaphene. The accuracy of estimation of water quality in the Bayou des Arc area using data for Bayou Two Prairie near Cabot is limited by the distance between the two locations. Bayou Two Prairie near Cabot is about 30 miles southwest of the Bayou des Arc area.

Data for Little Red River at Judsonia also were compared with data collected in August 1984 and April 1985 for a relatively undisturbed site on Ten Mile Creek (fig. 4) by ADPCE (Bennett and others, 1987). The most notable differences between the data for Little Red River at Judsonia and Ten Mile Creek are the lower turbidity (2 to 5 NTU) and total recoverable iron (190 to 400 ng/L) at Ten Mile Creek. Alkalinity concentrations at Ten Mile Creek (8 to 28 mg/L) are possibly lower than at Little Red River at Judsonia.

Diversion from White River near Des Arc

Comparison of medians of data for White River near Augusta (tables 87-88) and White River at DeValls Bluff (tables 91-92) and data for Wattensaw Bayou near Hazen (table 129) indicated that water diverted from the White River may have higher concentrations of some dissolved constituents (see hardness) and higher pH values than will water in Bayou des Arc and Wattensaw Bayou (fig. 4). Dissolved-solids, dissolved-sulfate and dissolved-chloride concentrations tend to be slightly higher at Wattensaw Bayou near Hazen than in the White River.

Diversion from White River near DeValls Bluff Westward

Comparison of data for White River at DeValls Bluff with data from Bayou Two Prairie near Cabot (table 130) indicated that water diverted from the White River will have higher concentrations of some dissolved constituents (primarily magnesium and calcium carbonate) than will water in Bayou Two Prairie (fig. 4). The White River also has higher values of dissolved oxygen, pH, specific conductance, alkalinity, hardness, and 2-4,D and lower values of several nutrients and metals, and fecal coliform bacteria.

25

Diversion from Arkansas River near David D. Terry Lock and Dam

Comparison of water-quality data for Arkansas River at David D. Terry Lock and Dam below Little Rock with data for Bayou Meto near Lonoke (table 131), Bayou Two Prairie near Cabot (table 132), and Wattensaw Bayou near Hazen (table 129) (fig. 4) indicated that significant differences exist in concen trations of several nutrients, metals, and common dissolved constituents. The Arkansas River has higher concentrations of dissolved sulfate, chloride, and most other common dissolved constituents than Bayou Meto, Bayou Two Prairie, and Wattensaw Bayou. The Arkansas River has lower values of several nutrients and metals, and turbidity. Median June through September dissolved chloride concentrations at the stations were 110, 50, and 13 mg/L at David D. Terry Lock and Dam, Lonoke, and Cabot, respectively. The median January through December chloride concentration at Hazen was 14 mg/L. Substantial differences between the stations also exist between median dissolved-sulfate concentra tions. Arkansas water-quality regulations (Arkansas Department of Pollution Control and Ecology, 1988) state that, as a guideline, levels of chloride and sulfate should not be increased by more than 15 mg/L over naturally occurring levels. Comparison of the June through September median dissolved-chloride concentration of the Arkansas River at David D. Terry Lock and Dam below Little Rock (110 mg/L) with the median of Bayou Two Prairie near Cabot (13 mg/L) indicates that increasing flow in Bayou Two Prairie with water from the Arkansas River by as little as 20 percent may increase chloride concentrations in excess of this guideline.

Median fecal coliform bacteria concentrations were also higher in the Arkansas River (400 colonies per 100 mL) than in Bayou Meto (210 colonies per 100 mL), Bayou Two Prairie (220 colonies per 100 mL), and Wattensaw Bayou (170 colonies per 100 mL). Median lead concentrations were higher in the Arkansas River (12 jig/L) than in Wattensaw Bayou (4 jig/L). Differences in analysis method (bacteria) and time period (lead) may decrease the applicability of these comparisons.

A former chemical manufacturing plant (Walton and Drye, 1982) near the upstream end of Bayou Meto has been included in the National Priorities List of Superfund hazardous-waste sites identified by the U.S. Environmental Protection Agency (1986) under the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) of 1980. Dioxin (2,3,7,8 tetrachlorodibenzo-p-dioxin) has been found in bottom material and fish tissue in Bayou Meto (Arkansas Department of Pollution Control and Ecology, 1983). In bottom material, dioxin was detected in 1979 and 1981 at Highway 161 (0.25 to 1.5 jig/kg) upstream of the proposed diversion location and in 1981 at Highway 15 (0.023 ng/kg) about 2 miles downstream of the currently proposed diversion location. Dioxin was not detected further downstream. Dioxin concentrations were highest in fish during 1979 through 1981, at Highway 161 and Interstate 40. Dioxin concentrations ranged from 0.12 to 0.31 ng/kg and generally decreased downstream to <0.025 jig/kg at Highway 79 which is about 70 river miles downstream of Interstate 40 and the proposed diversion location.

Diversion from Black River near Black Rock

Comparison of data for Black River at Black Rock with data for Bayou DeView near Gibson (table 133), Bayou DeView at Morton (table 134), L'Anguille

26

River near Colt (table 135), L'Anguille River at Marianna (table 136), and Big Creek near Watkins Corner (table 137) (fig. 5) indicated that water diverted from the Black River would be higher in dissolved oxygen, pH, total alka linity, and total hardness than the water in the receiving streams. Dissolved-solids concentrations probably are higher at most locations in the receiving streams than at Black River at Black Rock. Sulfate, chloride, nutrients, bacteria, turbidity, and metal values are lower in the Black River than in the receiving streams.

Diversion from White River near DeVails Bluff Eastward

Comparison of data for White River at DeValls Bluff with data for Big Creek near Watkins Corner (table 138) (fig. 5) indicated that ̂ wajter diverted from the White River will have higher dissolved oxygenJ^ pH, and total alkalinity values than will water in Big Creek. Sulfate, chloride, dissolved- solids, nutrient, bacteria, turbidity, metal, and Z^^ values are lower in the White River.

Median values for White River at DeValls Bluff also were compared with median values for Boat Gunwale Slash near Holly Grove (table 139) (fig. 5). This station also had been sampled in August 1983 and April 1984 as part of a study of least-disturbed streams (Bennett and others, 1987). Water in the White River is harder than water in Boat Gunwale Slash and dissolved solids, turbidity, and nitrite plus nitrate values are higher in the White River than in Boat Gunwale Slash.

Diversions for Artificial Recharge

Artificial recharge of the alluvial aquifer in the Grand Prairie and in the Poinsett-Cross-St. Francis-Woodruff Counties area west of Crowleys Ridge also is being considered (fig. 1). The two primary methods of artificial recharge would involve injection of diverted surface water into wells or surface pits. The quality of the mix of surface water and native ground water may affect the artificial recharge process. Potential water-quality problems include ion exchange, iron precipitation, turbidity, and decreased drinking water acceptability.

Ion exchange commonly occurs between solutes in ground water and aquifer materials; if clay particles become saturated with sodium they will swell and may decrease aquifer permeability (Sniegocki, 1963). Comparison of quality of ground water in the alluvial aquifer in the Grand Prairie area and the area west of Crowleys Ridge (table 140) with quality of surface water that may be diverted to these areas indicates that the percent sodium (proportion of milliequivalents of sodium to the sum of the milliequivalents of sodium, potassium, calcium, and magnesium) of ground water in the recharge areas (Crowleys Ridge, 10 percent; Grand Prairie, 22 percent) exceeded percent sodium of water at Black River at Black Rock (3 percent, see table 81) and White River at Newport (4 percent, see table 85). Because percent sodium values are higher in the native ground water, additional sodium ions would not be exchanged onto the clay particles and particles would not swell. However, the percent sodium of water at Arkansas River at David D. Terry Lock and Dam below Little Rock (53 percent, see table 110) exceeds the percent sodium of

27

ground water in both recharge areas. The preceding percent sodium values were calculated using median concentrations. The three surface water stations were the stations with sufficient data closest to the applicable diversion points.

Sodium ion exchange and resulting swelling of clay particles would probably have little effect upon aquifer permeability as a result of injection of these surface waters. Surface water would probably be injected into the basal zone of the aquifer. There is little clay mixed with the sand strata of. the basal zone and any clay swelling or dispersal from the clay lenses in the aquifer probably would not seriously reduce aquifer permeability (Sniegocki, 1963). Artificial recharge of water diverted from the Arkansas River through surface pits may be hindered by swelling and dispersal of clay particles resulting from sodium ion exchange.

Introduction of oxygenated surface water into the aquifer can cause precipitation of dissolved iron present in anaerobic ground water (Huisman and Olsthoorn, 1983, p. 268). Sniegocki (1963) measured redox potential and pH of native ground water and surface water in the Grand Prairie. These values indicated that iron would remain in solution in native ground water but that the surface water had a redox potential and pH which would cause the iron to be oxidized and precipitated as ferric hydroxide. The plugging effect would be negligible at first, but long term recharge and accumulation of precipi tated iron could cause an eventually severe reduction of aquifer permeability (Sniegocki, 1963). Iron concentrations in the alluvial aquifer generally are higher than in other aquifers in Arkansas (Morris, 1988). Iron concentrations appear to be higher in the Grand Prairie area than in the area west of Crowleys Ridge (table 140).

Suspended solids present in the recharge water have a detrimental effect upon both surface pit and well injection recharge methods (Oaksford, 1985). Injection wells and infiltration surfaces of pits can be clogged by suspended particles, however, infiltration surfaces of pits are more accessible for remedial treatment. Primary sedimentation and chemical clarification can be used to remove suspended solids from water before it is used for recharge (Treweek, 1985).

In the potential artificial-recharge area, the alluvial aquifer is the drinking-water source of a large part of the population. Drinking water of approximately one-third of the population in the Crowleys Ridge artificial recharge area is self supplied. Drinking water of approximately one-half of the population in the Grand Prairie artificial recharge area is self supplied. Nearly all of the self-supplied and some of the public-supplied drinking water is likely to come from the alluvial aquifer. For this reason, drinking water standards may need to be considered before artificial recharge procedures are begun.

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SUMMARY AND CONCLUSIONS

Existing water-quality data were summarized for several stations in northeastern Arkansas. Some of these data were used to assess effects of planned surface water diversions upon receiving stream water quality and upon the alluvial aquifer if the diverted water is used for artificial recharge of the aquifer.

Several generalizations can be made about the water-quality data summarized in this report. For most properties (except pesticides) and at most stations, more than 50 analyses were available for summarization. Dissolved magnesium, total alkalinity, and fecal streptococcal bacteria were measured fewer than 50 times at many stations. For most properties, values of the two most common measures of central tendency differed; mean values generally exceeded median values indicating that the data were not normally distributed and reflecting the infrequent occurrence of extremely high values. This was most apparent for discharge and bacteria values.

Differences in typical (median value) quality of water and bottom material exist between selected major groups of rivers in the study area. The group of stations on the Arkansas River is higher than all other groups in specific conductance, dissolved sulfate and chloride, and dissolved solids. It has relatively low nutrient, iron, manganese, and turbidity values.

Bayou Meto and Bayou Two Prairie are higher than most groups in dissolved chloride, nitrogen, and manganese. Dissolved solids, specific conductance, alkalinity and hardness are lower in this group than in most other groups. Sulfate concentrations generally increased during the study period.

By several measurements, the Black and Current Rivers have the best water quality in the study area. The rivers are lower in nutrients, bacteria, turbidity, dissolved chloride, dissolved sulfate, and many trace metals than other river groups. Increasing trends in sulfate and decreasing trends in total ammonia occurred during the study period.

The Cache River and Bayou DeView are high (relative to other river groups) in turbidity, phosphorus, biochemical oxygen demand, fecal-coliform bacteria, and some pesticides. The rivers are relatively low in conductance, hardness and alkalinity. Decreasing trends generally were detected in total ammonia and fecal-coliform bacteria.

The St. Francis River is most different from other river g'roups because of its higher suspended sediment and total recoverable iron concentrations. Ammonia concentrations generally decreased during the study period.

Tributaries of the St. Francis River are high (relative to most other groups) in common dissolved constituents, phosphorus, several pesticides and trace metals, and suspended sediment. Fecal coliform concentrations decreased during the study period at several stations.

The White River generally has lower concentrations of common dissolved constituents, nutrients, bacteria, and iron than most other river groups. Generally dissolved sulfate concentrations increased and total ammonia concentrations decreased during the study period.

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Available data for pesticides in bottom material indicate some generalizations which can be made. Organochlorine pesticides were detected more frequently than organophosphorus pesticides. DDD, DDE, DDT, aldrin, dieldrin, and endrin were often detected in at least 50 percent of samples from a station or basin. Concentrations tend to be higher in rivers with bottoms of fine-grained particles (such as the L'Anguille River and Bayou DeView) and lower in rivers with coarser-grained particles (such as the St. Francis and White Rivers). Highest median concentrations tend to occur in Flat Bayou, the L'Anguille River basin, and Bayou DeView. Median concen trations were almost always less than the detection limit (generally 0.1 W5/kg) in samples from the St. Francis and White Rivers.

Values for six properties frequently (at least 25 percent of samples) exceeded criteria or standards at greater than one-third of stations in the study area. These properties are iron, total phosphorus, fecal-coliform bacteria, turbidity, lead, and copper. The iron criterion was frequently exceeded at about 90 percent of stations in the study area. The phosphorus criterion was exceeded at about 80 percent of stations in the area. The fecal-coliform bacteria standard was not compared directly to the data but at about two-thirds of the stations the standard may be exceeded frequently. Turbidity values that are not to be exceeded as the result of waste discharge or instream activity were frequently exceeded at about 40 percent of the stations. Lead and copper concentrations frequently may exceed criteria.

Effects of diversions of surface water upon existing quality of surface water which could possibly be detrimental and which can reasonably be predicted from available data primarily are related to concentrations of common dissolved constituents. The diversion from the Little Red River may lower alkalinity concentrations in some receiving streams making the streams more susceptible to pH fluctuations. No potential detrimental effects resulting from the diversion from the White River near Des Arc were detected. Diversion westward from the White River near DeValls Bluff might increase dissolved solids (primarily calcium and magnesium carbonates) concentrations. The diversion from the Arkansas River near DawLd D. Terry Lock and Dam would likely increase dissolved sulfate and dissolved chloride concentrations by more than 15 mg/L in many of the receiving streams. Fecal coliform bacteria and lead concentrations might also be increased. Another consideration in Bayou Meto is possible increased mobilization of any dioxin in bottom material caused by resuspension of the bottom material resulting from increased flows in Bayou Meto. No potential detrimental effects from the diversion from the Black River were detected although the diverted water is harder and more alkaline. Diversion of water from the White River near DeValls Bluff eastward into Big Creek and its tributaries may slightly increase dissolved-solids and nitrate plus nitrite concentrations and turbidity in the upstream parts of Big Creek and its tributaries.

Other potential water quality effects were not specifically addressed in this study. These include the effects of higher streamflow (for example, resuspension of bottom materials, changes in particle-size distributions, increased reaeration rates, and decreased travel times), pesticides and metals not sampled, infrequently occurring water-quality values (values occurring at extreme low or high discharges for example), and effects resulting from project construction activities.

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Use of surface water for artificial recharge of the alluvial aquifer may cause some problems unless the surface water is treated before use. Ion exchange of sodium may cause some swelling of clay particles, resulting in plugging, where Arkansas River water is introduced to the alluvial aquifer through surface pits. Iron oxidation may also cause well and aquifer plugging. Reduction of suspended solids concentrations will probably be necessary. Finally, because much of the population of the most likely recharge areas gets drinking water from the alluvial aquifer, drinking water standards may need to be considered before artificial recharge procedures are begun.

31

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INDEX OF STATIONS

Station name and number

Arkansas River at Dam No. 2 near Gillett (07265283)...............86,187,189Arkansas River at David D. Terry Lock and Dam below Little Rock

(07263620)...................................................... 81,177,179Arkansas River at Lock and Dam 3 near Swan Lake (07263750)........82,181Arkansas River at Murray Dam at Little Rock (07263450)............80,176Bayou DeView at Morton (07077700).................................74,163,165Bayou DeView near Brasfield (07077750)............................75,167Bayou DeView near Gibson (07077660)...............................73,161,162Bayou Meto near Bayou Meto (07265099).............................85,186Bayou Meto near Lonoke (07264000).................................83,182,183Bayou Two Prairie near Cabot (07264050)...........................84,184,185Big Creek near Watkins Corner (07077960)..........................78,173,174Big Slough Ditch near Paragould (07040350)........................ 96Black River at Black Rock (07072500)..............................64,138,140Black River at Jacksonport (07074490).............................65,142,143Black River at Pocahontas (07069000)..............................63,136,137Black River near Corning (07064000)...............................61,134Boat Gunwale Slash near Holly Grove (07077862)....................214Cache River at Brasfield (07077600)...............................72,160Cache River at Patterson (07077500)...............................71,156,158,195Cache River near Cash (07077400)..................................70,154,155Cache River near Cotton Plant (07077555).......................... 196Clark Corner Cutoff near Colt (07047904).......................... 119Cockle Burr Slough Ditch near Monette (07040496).................. 103Cross County Ditch near Birdeye (07047815)........................ 113Current River near Pocahontas (07068850).......................... 62,135Eightmile Ditch near Paragould (07040428).........................98L'Anguille River at Marianna (07047964)...........................58,129,130L'Anguille River near Palestine (07047950)........................ 128L'Anguille River near Cherry Valley (07047936).................... 121L'Anguille River near Colt (07047942).............................57,122,125Little Red River at Judsonia (07076634)...........................68,150,151Little River at Big Lake Outlet near Manila, Right Hand Chute of

(07046500)...................................................... 104Little River at Rivervale, Right Hand Chute of (07046600)......... 105Locust Creek Ditch near Paragould (07040424)......................97Pemiscot Bayou at Dell (07047400).................................53,106Right Hand Chute of Little River at Big Lake Outlet near Manila

(07046500)...................................................... 52,104Right Hand Chute of Little River at Rivervale (07046600).......... 105St. Francis Bay at Riverfront (07047900)..........................56,115,117St. Francis River at Fisk, Mo. (07040000).........................87St. Francis River at Holly Island (07040057)......................94St. Francis River at Lake City (07040450).........................51,99,101St. Francis River at Madison (07047907)........................... 120St. Francis River at Parkin (07047800)............................55,108,110St. Francis River at St. Francis (07040100).......................50,91,197St. Francis River Floodway near Marked Tree (07047810)............ 112St. Francis River near Glennonville, Mo. (07040060)...............89

38

Station name and number Page

St. Francis River near Piggott (07040110).........................93St. Francis River near Powe, Mo. (07040057).......................88St. Francis River north of Helena (07047968)......................59,131,132Straight Slough near Birdeye (07047882)........................... 114Tyronza River near Twist (07047700)...............................54,107Varney River near Senath, Mo. (07040150)..........................95Wattensaw Bayou near Hazen (07076950).............................204White River at Arkansas Post Canal near Nady (07078285)...........79,175White River at Clarendon (07077800)...............................76,168,170White River at DeValls Bluff (07077000)...........................69,152,153White River at Newport (07074500).................................66,144,146White River at Oil Trough (07061105)..............................60,133White River at St. Charles (07077820).............................77,172White River near Augusta (07074850)...............................67,148,149Wilhelmina Cutoff near Campbell, Mo. (07040070)...................90

39

Table 1. Arkansas Department of Pollution Control and Ecology and U.S. Geological Survey stations summarized and related information

[Water years begin October 1 and end September 30. Sampling agencies are the U.S. Geological Survey (USGS) and the Arkansas Department of Pollution Control and Ecology (ADPCE); S indicates U.S. Army Corps of Engineers sediment network; N indicates National Stream Quality Accounting network; G indicates Arkansas Geological Commission cooperative network. Under the "Previous investigations 11 column: 1= Ward (1963), 2 = Jeffus and others (1967), 3 = Steele (1971), 4 = Briggs and Ficke (1977), 5 = Smith and others (1982), 6 = Britton and others (1983), 7 = Wells and Schertz (1983), 8 = Smith and Alexander (1983) or Smith and Alexander (1985), and 9 = Stoner (1985). The stations sampled by ADPCE are summarized in the Water Quality Inventory Reports (ADPCE, 1974; 1975; 1976; 1977; 1980; 1982; 1984; 1986a). Stations summarized by previous investigation may not be identical in location to station listed here]

Station number Station name

Water years summarized (inclusive)

Sampling agency

Previous investi gations

07040000 St. Francis River at Fisk, Mo. 1978-85 07040057 St. Francis River near Powe, Mo. 1978-84 07040060 St. Francis River near 1978-85

Glennonville, Mo. 07040070 Wilhelmina Cutoff near 1978-85

Campbell, Mo. 07040100 St. Francis River at St. Francis 1975-85

07040110 St. Francis River near Piggott 1978-8507040130 St. Francis River at Holly Island 1978-8507040150 Varney River near Senath, Mo. 1978-8107040350 Big Slough Ditch near Paragould 1978-8407040424 Locust Creek Ditch near Paragould 1978-8407040428 Eightmile Ditch near Paragould 1978-8407040450 St. Francis River at Lake City 1975-85

07040496 Cockle Burr Slough Ditch near 1979-85Monette

07046500 Right Hand Chute of Little River 1975-83at Big Lake Outlet near Manila

07046600 Right Hand Chute of Little River 1978-85at Rivervale

07047400 Pemiscot Bayou at Dell 1975-83 07047700 Tyronza River near Twist 1975-83 07047800 St. Francis River at Parkin 1975-85 07047810 St. Francis River Floodway 1978-85

near Marked Tree07047815 Cross County Ditch near Birdeye 1978-85 07047882 Straight Slough near Birdeye 1978-84 07047900 St. Francis Bay at Riverfront 1975-85 07047904 Clark Corner Cutoff near Colt 1978-85 07047907 St. Francis River at Madison 1978-85

USGS(S) USGS(S) USGS(S)

USGS(S)

ADPCEUSGS(S)USGS(S)USGS(S)USGS(S)USGS(S)USGS(S)USGS(S)ADPCEUSGS(S)USGS(S)

ADPCE

USGS(S)

ADPCEADPCEUSGS(N) 4,5,6,7,8USGS(S)

USGS(S)USGS(S)USGS(N,S) 4,5,6,7,8USGS(S)USGS(S)

40

Table 1. Arkansas Department of Pollution Control and Ecology and U.S. Geological Survey stations summarized and related information Continued

Station number Station name

Water years summarized (inclusive)

Sampling agency

Previous investi gations

07047936 L'Anguille River near Cherry 1981-84Valley

07047942 L'Anguille River near Colt 1975-8507047950 L'Anguille River near Palestine 1981-8407047964 L'Anguille River at Marianna 1975-8507047968 St. Francis River north of Helena 1975-8307061105 White River at Oil Trough 1975-8307064000 Black River near Corning 1975-8307068850 Current River near Pocahontas 1975-8507069000 Black River at Pocahontas 1978-8507072500 Black River at Black Rock 1975-8507074490 Black River at Jacksonport 1975-8307074500 White River at Newport 1978-8507074850 White River near Augusta 1975-8307076634 Little Red River at Judsonia 1975-8307077000 White River at DeValls Bluff 1975-8507077400 Cache River near Cash 1975-8307077500 Cache River at Patterson 1976-8507077555 Cache River near Cotton Plant 198807077600 Cache River at Brasfield 1975-8307077660 Bayou DeView near Gibson 1975-8507076950 Wattensaw Bayou near Hazen 1984-8707077700 Bayou DeView at Morton 1975-8507077750 Bayou DeView near Brasfield 1975-8307077800 White River at Clarendon 1975-85

07077820 White River at St. Charles 1975-85 07077862 Boat Gunwale Slash near 1984-87

Holly Grove07077960 Big Creek near Watkins Corner 1975-83 07078285 White River at Arkansas Post 1975-83

Canal near Nady 07263450 Arkansas River at Murray Dam 1975-85

at Little Rock 07263620 Arkansas River at David D. Terry 1975-85

Lock and Dam below Little Rock 07263750 Arkansas River at Lock and Dam 3 1975-83

near Swan Lake07264000 Bayou Meto near Lonoke 1975-83 07264050 Bayou Two Prairie near Cabot 1975-83 07265099 Bayou Meto near Bayou Meto 1975-83 07265283 Arkansas River at Dam No. 2 1975-83

near Gillett

USGS(S)

USGS(G,S)USGS(S)ADPCEADPCEADPCEADPCEADPCEADPCEUSGS(G)ADPCEUSGS(N)ADPCEADPCEADPCEADPCEUSGS(G)USGSADPCEADPCEADPCEUSGS(G)ADPCEUSGS(N)

ADPCE ADPCE

ADPCE ADPCE

1,2

1,2

1,2,7

1,2,3

1,2,4,5,6, 7,8

123 1 »^» ->ADPCE

USGS(N) 4,5,6,7,8,9

ADPCE

ADPCEADPCEADPCEUSGS(N) 7ADPCE

M1

Table 2. Properties, associated parameter codes, and water years included in statistical summaries

[USGS = U.S. Geological Survey, ADPCE = Arkansas Department of Pollution Control and Ecology, NASQAN = National stream quality accounting network, AGC = Arkansas Geological Commission, CE = U.S. Army Corps of Engineers. Some stations are part of more than one program; data occurrence is listed only under the appropriate station type]

Water years

PropertyDischarge

(orDissolved oxygenPHSpecific conductanceTotal alkalinity

STORET parameter

code0006100060)00300004000009500410

ADPCE stationsVariable

1975-851975-851975-801975-80

NASQAN1975-85

do.do.do.do.

USGS stationsAGC CE

cooperative sediment1975-85 1978-85

do. do.do. do.do . do .do.

(or 90410)Total hardnessDissolved calciumDissolved magnesiumDissolved sodiumSodium adsorption

ratioDissolved potassiumDissolved sulfateDissolved chlorideDissolved fluorideDissolved silicaDissolved solids

(residue on evaporation at 180 °C)

Total phosphorusTotal nitrogenTotal organic

nitrogenTotal nitrite plus

nitrateTotal ammonia5-day biochemical

oxygen demandFecal coliformbacteria (0.7micron filter)

Fecal coliformbacteria (0.45micron filter)

0090000915009250093000931

009350094500940009500095570300

006650060000605

00630

0061000310

31625

31616

1975-831975-771975-77

1975-851975-85 --

1978,1980-85

1975-85--

1978,1981-851977-851975-85

1975-85

do.do.do.do.do.

do.do.do.do.do.do.

do.1975-821978-81

1975-81

1978-81

1977-85

1975-76

do.do.do.do.do.

do.do.do.do.

1975-81do.

1975-85do.

1980-85

1975-85

1980-851975-85

1977-85

1975-76

42

Table 2. Properties, associated parameter codes, and water yearsincluded in statistical summaries Continued

STORET parameter

Property codeFecal strepto-

coccal bacteria(KF agar)

Fecal strepto-coccal bacteria(m-enterococcusagar)

Turbidity(nephelometric)

Total arsenic

Total recoverablecadmium

Total recoverablechromium

Total recoverablecopper

Total recoverableiron

Total recoverablelead

Total recoverablemanganese

Total recoverablezinc

Total aldrin

Total aldrin inbottom material

Total chlordane

Total chlordanein bottom material

Total DDD

Total DDDin bottom material

Total DDE

Total DDE inbottom material

31673

31679

00076

01002

01027

01034

01042

01045

01051

01055

01092

39330

39333

39350

39351

39360

39363

39365

39368

ADPCE stations

1975-77

1981-85

1975-77,1979-821975-85

1975-85

1975-85

1975-80

b 1975-8l,1984-851975-80

1975-85

1975-85

1975-85

Water Yearsuses stations

AGC NASQAN cooperative1978-85

1975-77

1978-85

1975-82

do.

do.

do.

1975-82

b 1979-82 b

1975-82

1975-82

1975-82

1976,1978-80, 19821975-80, 1982

1976, 1978-80

1975-80, 1982

1976, 1979,19821975-82

1976, 1979,1982

1978-85

1975-76

1980-81

1975,1977-85

do.

do.

do.

1975-85

1979-85

1975-85

1975,1977-851975,1977-801975,1977-801975,1977-801975,1977-801975,1977-801975,1977-801975,1979-801975,1977-80

CE sediment

--

--

--

--

--

43


Water Years

PropertyTotal DOT

Total DOT inbottom material

Total diazinon

Total diazinon inbottom material

Total dieldrin

Total dieldrin inbottom material

Total endosulfanTotal endosulfan

in bottom materialTotal endrin

Total endrinin bottom material

Total ethion

Total ethion inbottom material

Total heptachlor

Total heptachlor inbottom material

Total heptachlorepoxide

Total heptachlorepoxide inbottom material

Total lindane

Total lindaneTotal lindane in

bottom materialTotal ma lath ion

Total mala th ion inbottom material

Total methoxyohlor

Total methoxychlorin bottom material

STORET parameter ADPCE

code stations39370 1975-85

39373

39570

39571

39380 1975-85

39383

3938839389

39390 1975-85

39393

39398

39399

39410

39413

39420

39423

39340

39782 1975-8539343

39530 1979-81

39531

39480

39481

NASQAN1975-82

1976,1978-79,1975-80,19821976,1978-801975-82

1976,1978-8019821982

1975-82

1976,1978-80,1975-80,19821976,1978-801975-80,19821976,1978-80,1975-80,19821976,1978-80,19821975-80,1982

1976-80,19821975-82

1976,1978-801975-80,19821976,1978-80,

USGS stationsAGC

cooperative1975,1977-801975,

1982 1977-801975,1977-801975,1978-801975,1977-801975,1977-801977-80

1975,1977-801975,

1982 1977-801975,1977-801975,1978-801975,1977-801975,

1982 1977-801975,1977-801975,1978-80

1975,1977-80

1975,1977-801975,1977-801975,1978-801977-80

1978-801982

CE sediment

--

--

44


PropertyTotal methyl

para th ionTotal methyl

pa rath ion inbottom material

Total methyltrithion

Total methyltrithion inbottom material

Total mi rexTotal mi rex in

bottom materialTotal parathion

Total parathion inbottom material

Total per thaneTotal toxaphene

Total toxaphene inbottom material

Total trithion

Total trithion inbottom material

Total 2,4-D

Total 2,4,5-T

Total silvex

Suspended sedimentSuspended sediment,

STORET parameter ADPCE

code stations39600 1975-85

39601

39790

39791

3975539758

39540

39541

3903439400 1975-85

39403

39786

39787

39730 1979-83

39740

39760

8015470346

Water Yearsuses stations

AGC CE NASQAN cooperative sediment1975-82

1976,1978-80

1975-80,19821976,1978-80

19821982

1975-80,19821976,1978-8019821975-82

1976,1978-80, 19821975-80,19821976,1978-801975-82

1976-78,1980, 19821976-78,1980, 19821975-85

1975,1977-801975,1978-80

1975,1977-801975,1978-80

1977-80

1975,1977-801975,1978-801979.801975,1977-801975,1977-801975,1977-801975,1978-801975,1977-801975,1977-801975,1977-801980, 1985 1978-i

do.fall diameter, percent finer than 1 millimeter

Suspended sediment, fall diameter, percent finer than 0.500 millimeter

Suspended sediment, fall diameter, percent finer than 0.250 millimeter

70345

70344

do.

do.

45

Table 2. Properties, associated parameter codes t and water years included in statistical summaries Continued

Water Years

Property

STORE?parameter AOPCE

code stations

USGS stationsAGC CE

NASQAN___cooperativeasedimentSuspended sediment, 70343

fall diameter,percent finer than0.125 millimeter

Suspended sediment, 70342fall diameter,percent finer than0.062 millimeter

Suspended sediment, 70331sieve diameter,percent finer than0.062 millimeter

Bed material, sieve 80172diameter, percentfiner than 16.00millimeters



Bed material, fall 80163diameter, percentfiner than 2.00millimeters

Bed material, sieve 80169diameter, percent,finer than 2.00millimeters

Bed material, fall 80162diameter, percentfiner than 1.00millimeter

Bed material, sieve 80168diameter, percentfiner than 1.00millimeter


1975-85

do.

1980, 1985 do,

1980, 1985 do,

do.

do.

do.

do.

do.

do.

do.

do.

46

Table 2. Properties, associated parameter codes, and water years included in statistical summaries Continued

Water Years

Property

STORETparameter ADPCE

code stations

USGS stationsAGC CE

NASQAN cooperative sedimentBed material, fall 80160

diameter, percentfiner than 0.250millimeter



do.

do.

do.

Among the different AGC cooperative network stations there is some variation from the time periods shown.USGS values for lead prior to water year 1979 are available in NWIS but were omitted from the statistical analyses in this report. Data for stations sampled by ADPCE and which are also part (table 1) of the USGS networks shown above included lead values from both agencies. All lead values prior to water year 1979 were omitted for these Jointly sampled stations.

Table 3. Values assigned as greatest detection limits used by Arkansas Department of Pollution Control and Ecology and U.S. Geological Survey laboratories between 1974 and 1985

[Actual detection limits are not known to exceed values shown. mg/L=milligrams per liter, jjLg/L=micrograms per liter, BTM=bottom material, jjig/kg=micrograms per kilogram]

____Assigned greatest detection limitArkansas Departmentof Pollution Control U.S. Geological

Property and units______________and Ecology____________Survey

Dissolved sulfate (mg/L) 1.0 5.0Dissolved fluoride (mg/L) .10Total phosphorus (mg/L) .01 .01Total nitrogen (mg/L) .10Total organic nitrogen (mg/L) .10Total nitrite + nitrate (mg/L) .05 .10Total ammonia (mg/L) .10 .01Turbidity (nephelometric turbidity units) 1 1Total arsenic (jig/L) 10 1Total recoverable cadmium (jig/L) 20 20Total recoverable chromium (jig/L) 20 20Total recoverable copper (jig/L) 20 20

Total recoverable iron (jig/L) 30 a

Total recoverable lead (jig/L) 20 2

Total recoverable manganese (ng/L) 27 aTotal recoverable zinc (jig/L) 20 20Aldrin (jig/L) .002 .01Aldrin in BTM (jig/kg) .1Chlordane (jig/L) .1Chlordane in BTM (jig/kg) 1.0DDD (jJig/L) .01DDD in BTM (ng/kg) .1DDE (jig/L) 0.002 .01DDE in BTM (ng/kg) .1DDT (jJig/L) .004 .01DOT in BTM (ng/kg) .1Diazinon (ng/L) .01Diazinon in BTM (jig/kg) -- .1Dieldrin (jig/L) .002 .01Dieldrin in BTM (jig/kg) .1Endosulfan (ng/L) .01Endosulfan in BTM (jig/kg) -- .1Endrin (ng/L) .002 .01Endrin in BTM (ng/kg) -- .1Ethion (ng/L) .01Ethion in BTM (jig/kg) .1Heptachlor (ng/L) .01Heptachlor in BTM (ng/kg) .1Heptachlor epoxide (»xg/L) .01

48

Table 3. Values assigned as greatest detection limits used by Arkansas Department of Pollution Control and Ecology and U.S. Geological Survey laboratories between 1974 and 1985 Continued

Assigned greatest detection limitArkansas Departmentof Pollution Control U.S. Geological

Property and units______________and Ecology____________Survey

Heptachlor epoxide in BTM (iig/kg)

Lindane (ng/L) cLindane in BTM (ng/kg)Malathion (iig/L) 0.05Malathion in BTM (ng/kg)Methoxychlor (ng/L)Methoxychlor in BTM (ng/kg)Methyl parathion (ng/L) .04Methyl parathion in BTM (jig/kg)Methyl trithion (ng/L)Methyl trithion in BTM (ng/kg)Mirex (ng/L)Mirex in BTM (ng/kg)Parathion (ng/L)Parathion in BTM (ng/kg)Per thane (ng/L)Toxaphene (ng/L) 2Toxaphene in BTM (ng/kg)Trithion (ng/L)Trithion in BTM (ng/kg)

2,4-D (ng/L) c2,4,5-T (ng/L)Silvex (ng/L)

.1

0.01.1.01.1.01.1.01.1.01.1.01.1.01.1.1

110

.01

.1

.01

.01

.01

o values below a detection limit in the data set

A detection limit of 100 micrograms per liter was used by the Geological Survey during all or parts of water years 197^ through 1978. Because of the large improvement in detection limits, all Geological Survey values for lead prior to water year 1979 were omitted from the statistical analyses in this report.

Detection limits used could not be determined.

Table 4. Results of Seasonal Kendall trend analysis for St. Francis Riverat St. Francis. Ark.. 07040100

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SCL is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equation that could be used in flow adjustment was hyperbolic (HYP6)]

Raw data Flow-adjusted data

Pro- Water perty Period years

Proba bility Estimated Water Equation of no trend years type r*~ of no

Proba- Esti- 2 bility mated

trend(inclu- trend sive)

(inclu sive)

trend

SC

SAR

so4

Cl

FC

TP

TNH

All

All

All

All

All

All

All

1975-85

ID

1975-83

1975-83

1975-83

1975-83

1975-83

0.31

< .01

.06

.04

.31

.52

NS

+0.63

+ .29

-5.0

NS

NS

1975-85 HYP6 0.63 0.37

ID

ID

ID

ID

ID

ID

NS

__

50

Table 5. Results of Seasonal Kendall trend analysis for St. Francis Riverat Lake City, Ark., 07040450

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SOj. is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were quadratic (QUAD) and hyperbolic (HYP?)]

Raw data

Pro perty

SC

SC

SAR

SAR

so4

so4Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

Water years (inclu sive)

1975-85

1975-85

ID

ID

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1977-83

1977-83

Probability of no trend

0.49

.41

< .01

.03

.15

.05

.04

.23

.58

.63

< .01

.24

Estimated trend

NS

NS

-»-0.63

+ .65

NS

+ .55

-5.0

NS

NS

NS

- .015

NS

Flow-adjusted dataProba-

Water Equation ^ bility years type r of no (inclu- trend sive)

1978-85 HYP7 0.70 0.08

1978-85 QUAD .71 .43

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

Estimated trend

-4.8

NS

51

Table 6. Results of Seasonal Kendall trend analysis for Right Hand Chute of Little River at Big Lake Outlet near Manila, Ark., 07046500

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SOj. is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected]


Property

WaterPeriod years

(inclusive)

Probabilityof notrend

Estimatedtrend

Wateryears(inclusive)

Equation ^type r


Estimatedtrend

SC

SAR

Cl

FC

TP

TNH

All

All

All

All

All

All

All

1975-81

ID

1975-83

1975-83

1975-83

1975-83

1975-83

0.84

.71

.25

.50

.20

.49

NS

NS

NS

NS

NS

NS

ID

ID

ID

ID

ID

ID

ID

52

Table 7. Results of Seasonal Kendall trend analysis for Pemiscot Bayouat Dell t Ark., 07047400

[Properties: SC is specific conductance, in raicrosieraens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SCL is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equation that could be used in flow adjustment was log-linear (LOGLIN). NONE indicates that none of the flow-adjusted equations were used. DL indicates that flow-adjustment procedures were not performed because more than 5 percent of the water-quality property data paired with discharge data were censored]


Pro perty

SC

SAR

so4

Cl

FC

TP

TNH

Period

All

All

All

All

All

All

All


1975-80

ID

1975-83

1975-83

1975-83

1975-83

1977-83


0.17

.96

.03

< .01

.09

.16

Estimated trend

NS

NS

+0.32

-110

- .034

NS


ID

ID

1976-83

1976-83

ID

ID

1978-83

Proba-Equation 2 bility

type r of no trend

NONE

LOGLIN 0.15 0.67

DL

Estimated trend

NS

53

Table 8. Results of Seasonal Kendall trend analysis for Tyronza Rivernear Twist. Ark.. 07047700

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SCL is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected]



(inclu- __________sive)

Proba bility Estimated Water Equation ~ of no trend years type r trend (inclu- _____ ______ sive) _____

Proba- Esti- bility mated of no trend trend

SC

SAR

Cl

FC

TP

TNH

All

All

All

All

All

All

All

1975-80

ID

1975-83

1975-83

1975-83

1975-83

1977-83

0.16

.03

1.00

.04

.11

.10

NS

-2.50

NS

-20.8

NS

NS

ID

ID

ID

ID

ID

ID

ID

Table 9. Results of Seasonal Kendall trend analysis for St. Francis Riverat Parkin. Ark.. 07047800

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SCL is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31625), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were log-log (LOGLOG) and hyperbolic (HYP4 and HYPY6). NONE indicates that none of the flow-adjustment equations were used. DL indicates that flow- adjustment procedures were not performed because more than 5 percent of the water-quality property data paired with discharge data were censored]

Raw data

Pro perty

SC

SC

SAR

SAR

so4

so4

Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1977-85

1977-85

1975-85

1975-85

ID

ID

Proba bility of no trend

0.57

1.00

.04

.18

.36

1.00

.02

.38

.72

.04

.04

.42

_-

Estimated trend

NS

NS

+<0.01

NS

NS

NS

+ .23

NS

NS

- 100

-.013

NS


1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1977-85

1977-85

1975-85

1975-85

ID

ID

Flow-adjusted dataProba- Esti-

Equation 2 bility mated type r of no trend

trend

NONE

HYP4 0.66 0.79 NS

NONE

NONE

HYP6 .45 .12 NS

DL

NONE

NONE

NONE

NONE

LOGLOG .24 .01 Decrease

NONE

__ __ __ __

55

Table 10. Results of Seasonal Kendall trend analysis for St. Francis Bayat Riverfront, Ark., 07047900

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SOj, is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal - coliform bacteria (parameter code 31625), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant(p<0.10) trend was detected. The regression equations that could be usedadjust-HYPY6).

Property

SC

SC

SAR

SAR

so4

so4

Cl

Cl

FC

FC

TP

TP

TNH

TNH

mentNONE

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

were log-linear (LOGLIN)indicates that none of the


1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1977-85

1977-85

1975-85

1975-85

ID

ID

Raw dataProbabilityof notrend

0.46

.83

.49

.66

.90

.64

.38

.86

.28

.75

< .01

.02

__

, log-log (LOGLOG) and hyperbolicin flow(HYP3-

flow-adjustment equations were used]

Flow-adjusted

Estimatedtrend

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

-0.012

- .012

__


1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1977-85

1977-85

1975-85

1975-85

ID

ID

Equationtype

HYP5

LOGLIN

LOGLOG

NONE

HYP6

HYP6

LOGLOG

HYPS

NONE

NONE

HYP4

HYP3

__

2r

0.70

.66

.11

.48

.68

.21

.09

.08

.27

__

dataProbabilityof notrend

0.61

.11

.51

.14

.26

.65

.86

< . 0 1 -0

.14

__

Esti-matedtrend

NS

NS

NS

NS

NS

NS

NS

.013

NS

56

Table 11. Results of Seasonal Kendall trend analysis for L'Anguille Rivernear Colt. Ark., 07047942

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SCL is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31625), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indi cates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were log-linear (LOGLIN), log-log (LOGLOG), log-quadratic log (LOGQUAD) and hyperbolic (HYP5-HYP6). NONE indicates that none of the flow-adjustment equations were used]

Raw data

Pro perty

SC

SC

SAR

SAR

so4

SO^

Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1977-85

1977-85

1975-85

1975-85

1980-85

1980-85


0.27

.96

.86

.78

.78

.48

.87

.40

< .01

.05

.50

.68

.94

.23

Estimated trend

NS

NS

NS

NS

NS

NS

NS

NS

-22.1

-55.2

NS

NS

NS

NS


1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1977-85

1977-85

1975-85

1975-85

1980-85

ID

Flow-adjusted

Equation ^ type r

NONE

LOGQUAD 0.25

LOGLIN .32

NONE

HYP5 .45

NONE

HYP6 .56

NONE

NONE

NONE

LOGLOG .05

NONE

NONE

__

dataProba bility of no trend

0.21

.58

.67

.17

.62

__

Esti mated trend

NS

NS

NS

NS

NS

__

57

Table 12. Results of Seasonal Kendall trend analysis for L'Anguille Riverat Marianna, Ark.. 07047964

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SOn is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected]


Property

WaterPeriod years

(inclusive)


Estimatedtrend


Equation 2type r


Estimatedtrend

SC

SAR

Cl

FC

TP

TNH

All

All

All

All

All

All

All

1975-81

ID

1975-85

1975-85

1975-85

1975-85

1977-85

0.73

.78

.20

1.00

.22

.66

NS

NS

NS

NS

NS

NS

ID

ID

ID

ID

ID

ID

ID

58

Table 13. Results of Seasonal Kendall trend analysis for St. Francis Rivernorth of Helena. Ark.. 07047968

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SOj, is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected]

Raw data

Pro perty

SC

SC

SAR

SAR

so4

so4

Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1975-81

1975-81

ID

ID

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1977-83

1977-83


0.77

.56

.76

.66

.76

.34

.39

.47

.47

1.00

< .01

.16

Estimated trend

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

-0.018

NS


Water Equation _ bility mated years type r of no trend (inclu- trend sive)

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

59

Table 14. Results of Seasonal Kendall trend analysis for White Riverat Oil Trough. Ark.. 07061105



Property

WaterPeriod years

(inclusive)


Estimatedtrend


Equation 2type r


Estimatedtrend

SC

SAR

so4

Cl

FC

TP

TNH

All

All

All

All

All

All

All

1975-85

ID

1975-85

1975-85

1975-85

1975-85

1977-85

0.04

< .01

.34

.63

< .01

< .01

+5.5

-i- .50

NS

NS

-i- .002

- .005

ID

ID

ID

ID

ID

ID

ID

60

Table 15. Results of Seasonal Kendall trend analysis for Black Rivernear Corning, Ark.. 07064000

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SCL is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were log-linear (LOGLIN), inverse (INV), and hyperbolic (HYP6). NONE indicates that none of the flow-adjustment equations were used. DL indicates that flow-adjustment procedures were not performed because more than 5 percent of the water-quality property data paired with discharge data were censored]



(inclu- ___________sive)

Proba- Proba- Esti-bility Estimated Water Equation 2 bility matedof no trend years type r of no trendtrend (inclu- trend_____ _____sive) ___________

SC

SAR

Cl

FC

TP

TNH

All

All

All

All

All

All

All

1975-80

ID

1975-83

1975-83

1975-83

1975-83

1977-83

0.61

.06

.20

.02

.63

.03

NS 1975-80 HYP6 0.76

ID

+0.38 1975-83 INV .04

NS

NS

1975-83 LOGLIN .24

0.73

.16

.44

NS

NS

NS

-12.1 1975-83 NONE

1975-83 NONE

- .007 1977-83 DL

61

Table 16. Results of Seasonal Kendall trend analysis for Current Rivernear Pocahontas. Ark., 07068850

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SCL is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were quadratic (QUAD) and log-log (LOGLOG). NONE indicates that none of the flow-adjustment equations were used. DL indicates that flow-adjustment procedures were not performed because more than 5 percent of the water-quality property data paired with discharge data were censored]


Pro perty

SC

SAR

so4

Cl

FC

TP

TNH*

Period

All

All

All

All

All

All

All


1975-80

ID

1975-85

1975-85

1975-85

1975-85

1977-85


0.52

< .01

.22

.67

.27

< .01

Estimated trend

NS

+0.33

NS

NS

NS

- .005


1975-80

ID

1975-85

1975-85

1975-85

1975-85

1977-85

Equation 2 type r

NONE

DL

QUAD 0.16

LOGLOG .22

NONE

DL


0.27

.09

Estimated trend

NS

Decrease

Frequency of occurrence of censored data (three detection limits that decreased during 1977-85) may be high enough to substantially affect trend analysis results. The probability of no trend may have been higher in the absence of censored data.

62

Table 17. Results of Seasonal Kendall trend analysis for Black Riverat Pocahontas. Ark.. 07069000

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SOj, is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were log-linear (LOGLIN), log-log (LOGLOG), and hyperbolic (HYP3 and HYP6). NONE indicates that none of the flow-adjustment equations were used. DL indicates that flow-adjustment procedures were not performed because more than 5 percent of the water-quality property data paired with discharge data were censored]


Pro perty

Water Period years

(inclu- ____sive)


Estimated trend

Water Equation years type (inclusive)


Esti mated trend

SC All ID

SC Irrig. ID

SAR All ID

ID

ID

ID

SAR

so4Cl

Cl

FC

FC

TP

TP

TNH

TNH

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

ID

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

0.09

.01

< .01

.01

.50

.38

.88

.86

< .01

.38

+0.22

+ .68

- .25

- .33

NS

NS

NS

NS

- .007

NS

ID

1978-85

1978-85

1978-85

1978-85

1977-85

1978-85

1978-85

1978-85

1978-85

1978-85

DL

DL

HYP6 0.19 <0.01

NONE

LOGLOG .11 .96

NONE

HYP3 .29 .06

LOGLIN .35 .34

DL

NONE

__

-0.26

NS

+ .138

NS

__

63

Table 18. Results of Seasonal Kendall trend analysis for Black Riverat Black Rock, Ark. t 07072500

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SCL is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31625), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were log-log (LOGLOG) and hyperbolic (HYPU). NONE indicates that none of the flow-adjustment equations were used. DL indicates that flow-adjustment procedures were not performed because more than 5 percent of the water-quality property data paired with discharge data were censored]

Raw data

Pro perty

SC

SC

SAR

SAR

sou

sou

Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1975-85

1975-85

1975-85

1979-85

1979-85

1979-85

1979-85

1979-85

1977-85

1977-85

1975-85

1975-85

1980-85

1980-85


0.17

.11

.11

.45

.49

.80

.63

.20

.62

.29

.18

.27

< .01

.55

Estimated trend

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

+ .010

NS


1975-85

1975-85

1975-85

1979-85

1979-85

1979-85

1979-85

1979-85

1977-85

1977-85

1975-85

1975-85

1980-85

ID

Flow-adjusted data

Equation ? type r

NONE

NONE

NONE

NONE

NONE

NONE

NONE

NONE

LOGLOG 0.11

NONE

HYP4 . 10

DL

DL

__


0.31 NS

.02 -0.004

__ __

64

Table 19. Results of Seasonal Kendall trend analysis for Black River at Jacksonport. Ark., 07074490

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; S0j, is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected]

Raw data

Pro perty

SC

SC

SAR

SAR

so4

so4

Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1975-80

1975-80

ID

ID

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1977-83

1977-83


0.34

.23

.02

.52

.17

.11

.12

< .01

1.00

.20

.02

.67

Estimated trend

NS

NS

+0.40

NS

NS

NS

NS

-24.8

NS

NS

- .008

NS


Water Equation 2 bility mated years type r of no trend (inclu- trend sive)

inX \J

ID

inX U ~

ID

ID

in _X U

ID

in __X U

inX U ~

ID

inj. U ~

ID

in _X U

inX LJ

65

Table 20. Results of Seasonal Kendall trend analysis for White Riverat Newport, Ark.. 07074500

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SCL is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31625), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equation that could be used in flow adjustment was hyperbolic (HYP4 and HYP6). NONE indicates that none of the flow- adjustment equations were used]

Raw data

Pro perty

SC

SC

SAR

SAR

sou

so4

Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

ID

ID


0.17

.34

.77

.90

.57

.79

.82

.29

.07

.02

.76

.77


Estimated Water Equation ^ bility mated trend years type r of no trend

(inclu- trend sive)

NS

NS

NS

NS

NS

NS

NS

NS

-10.8

-14.3

NS

NS

__

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

1978-85

ID

ID

HYP4 0.73 0.30 NS

HYP4 .64 .26 NS

NONE

NONE

NONE

HYP6 .28 .43 NS

NONE

NONE

NONE

NONE

NONE

NONE

__ __

66

Table 21. Results of Seasonal Kendall trend analysis for White Rivernear Augusta. Ark.. 07074850

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SOj. is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were inverse (INV) and log-log (LOGLOG). NONE indicates that none of the flow-adjustment equations were used]

Raw data

Pro perty

SC

SC

SAR

SAR

so4

so4

Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1975-80

1975-80

ID

ID

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1977-83

1977-83


0.01

.28

< .01

.02

.03

.01

.18

.03

.65

.30

< .01

.04

Estimated trend

+8.4

NS

+ .40

+ .40

+ .12

+ .21

NS

-12.8

NS

NS

- .008

- .011


ID

ID

ID

ID

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1977-83

1977-83

Flow-adjusted data

Equation ~ type r

NONE

NONE

INV 0.37

NONE

NONE

NONE

LOGLOG .13

NONE

NONE

NONE


0.09 +0.16

.56 NS

__

67

Table 22. Results of Seasonal Kendall trend analysis for Little Red River at Judsonia. Ark.. 07076634

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SCL is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected]


Pro perty

SC

SC

SAR

SAR

so4

so4

Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1975-80

1975-80

ID

ID

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1977-83

1977-83


<0.01

.42

< .01

.02

.13

.32

.71

.38

.05

.41

.18

.03

Estimated trend

+2.6

NS

+ .25

+ .33

NS

NS

NS

NS

+ .005

NS

NS

- .017

Water Equation 2 years type r (inclu sive)

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID


__ __

68

Table 23. Results of Seasonal Kendall trend analysis for White River at DeValls Bluff. Ark. t 07077000

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; S(X is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were log-linear (LOGLIN), log-log (LOGLOG), and hyperbolic (HYP4). NONE indicates that none of the flow-adjustment equations were used. DL indicates that flow-adjustment procedures were not performed because more than 5 percent of the water-quality property data paired with discharge data were censored]

Raw data

Pro perty

SC

SAR

so4

Cl

FC

TP

TNH

Period

All

All

All

All

All

All

All


1975-81

ID

1975-85

1975-85

1975-85

1975-85

1977-85


0.86

.05

.97

.43

.97

< .01

Estimated trend

NS

+0.17

NS

NS

NS

- .007


1975-81

ID

1975-85

1975-85

1975-85

1975-85

1977-85

Flow-adjusted data

Equation 2 type r

HYP4 0.53

NONE

LOGLIN .24

LOGLOG .08

NONE

DL


0.49

.42

.51

_

Estimated trend

NS

NS

NS

__

69

Table 24. Results of Seasonal Kendall trend analysis for Cache River near Cash. Ark.. 07077400

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SOn is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were inverse (INV), log-log (LOGLOG), and hyperbolic (HYP1). NONE indicates that none of the flow-adjustment equations were used. DL indicates that flow-adjustment procedures were not performed because more than 5 percent of the water-quality property data paired with discharge data were censored]

Raw data

Pro perty

SC

SC

SAR

SAR

so4

so4Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1975-81

1975-81

ID

ID

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1977-83

1977-83


0.04

.04

< .01

.33

.02

.03

.12

.47

.13

.94

< .01

.01

Estimated trend

+9.8

+27.8

+ .75

NS

+ .59

+ .98

NS

NS

NS

NS

- .030

- .033


1975-81

1975-81

ID

ID

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1977-83

ID

Flow-adjusted data

Equation 2 type r

NONE

INV 0.33

NONE

DL

LOGLOG .43

LOGLOG . 35

NONE

NONE

LOGLOG .05

NONE

NONE

HYP1 .32


0.03

.74

Esti mated trend

+20.9

NS

.01 INCREASE

.07 INCREASE

.11

NS

70

Table 25. Results of Seasonal Kendall trend analysis for Cache River at Patterson. Ark.. 07077500

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; S(X is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31625), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indi cates that no significant (p<0.10) trend was detected. ID indicates that insufficient data were available]

Raw data

Pro perty

SC

SC

SAR

SAR

so4

so4

Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1977-85

1977-85

1975-85

1975-85

1980-85

1980-85


0.20

.30

.09

.08

.20

.04

.09

.01

< .01

.08

.01

< .01

.87

.68

Estimated trend

NS

NS

+0.01

+ .02

NS

+ .65

+ .25

+ .45

-12.0

-19.6

- .007

- .009

NS

NS

Flow-adjusted data


ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

Proba- Esti-bility mated of no trend trend

__ __

71

Table 26. Results of Seasonal Kendall trend analysis for Cache River at Brasfield, Ark.. 07077600




(inclu sive)

Proba bility Estimated Water Equation ~ of no trend years type r trend (inclu

sive)


SC

SAR

so4

Cl

FC

TP

TNH

All

All

All

All

All

All

All

1975-81

ID

1975-83

1975-83

1975-83

1975-83

1977-83

0.33

.22

.13

.06

.48

.01

NS

NS

NS

- 8.7

NS

- .015

ID

ID

ID

ID

ID

ID

ID

72

Table 27. Results of Seasonal Kendall trend analysis for Bayou DeView near Gibson. Ark.. 07077660

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SCL is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were log-log (LOGLOG) and hyperbolic (HYP8). NONE indicates that none of the flow-adjustment equations were used]


Pro perty

SC

SC

SAR

SAR

so4

so4

Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1975-80

1975-80

ID

ID

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1977-85

1977-85


0.34

.23

.16

.17

.47

.15

.02

< .01

.75

.53

< .01

< .01

Estimated trend

NS

NS

NS

NS

NS

NS

-80.0

-91.3

NS

NS

- .072

- .177


ID

ID

ID

ID

1977-85

1975-85

1977-85

1975-85

1975-85

1975-85

1975-85

ID

1977-85

1977-85

Equation 2 type r

HYP8 0.08

NONE

NONE

LOGLOG .17

NONE

NONE

LOGLOG .24

NONE

NONE


0.09 +0.79

.92 NS

.96 NS

__

73

Table 28. Results of Seasonal Kendall trend analysis for Bayou DeView at Morton, Ark.. 07077700

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SOj. is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31625), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indi cates that no significant (p<0.10) trend was detected. ID indicates that insufficient data were available]

Raw data

Pro perty

SC

SC

SAR

SAR

so4

so4

Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1977-85

1977-85

1975-85

1975-85

1980-85

1980-85


0.56

.62

.53

.86

1.00

.54

.05

.16

.68

.16

.51

.70

.57

1.00

Estimated trend

NS

NS

NS

NS

NS

NS

+0.26

NS

NS

NS

NS

NS

NS

NS

Flow-adjusted data


ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID

ID


__

Table 29. Results of Seasonal Kendall trend analysis for Bayou DeView near Brasfield. Ark., 07077750



Pro perty

SC

SAR

so4

Cl

FC

TP

TNH

Period

All

All

All

All

All

All

All


1975-81

ID

1975-83

1975-83

1975-83

1975-83

1977-83


0.61

.03

1.00

.06

.42

< .01

Estimated trend

NS

+0.50

NS

- 4.2

NS

- .015

Proba-Water Equation 2 bility years type r of no (inclu- trend sive)

ID

ID

ID

ID

ID

ID

ID

Estimated trend

75

Table 30. Results of Seasonal Kendall trend analysis for White River at Clarendon, Ark., 07077800

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SOj. is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31625), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were quadratic (QUAD), log-quadratic log (LOGQUAD), and hyperbolic (HYP6). NONE indicates that none of the flow-adjusted equations were used. DL indicates that flow-adjustment procedures were not performed because more than 5 percent of the water-quality property data paired with discharge data were censored]

Raw data

Pro perty

SC

SC

SAR

SAR

SO^

so4Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1977-85

1977-85

1975-85

1975-85

1977-81

1977-81


0.57

.35

.34

.09

.27

1.00

.27

.08

.78

.34

.42

.53

< .01

.01

Estimated trend

NS

NS

NS

-K0.01

NS

NS

NS

- .10

NS

NS

NS

NS

+ .015

+ .016


1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1977-85

1977-85

1975-85

1975-85

1977-81

1977-81


Equation ^ bility type r of no

trend

QUAD 0.48 0.49

LOGQUAD .30 .71

NONE

NONE

NONE

NONE

HYP6 .05 1.00

NONE

NONE

NONE

NONE

NONE

DL

NONE

Esti mated trend

NS

NS

NS

76

Table 31. Results of Seasonal Kendall trend analysis for White River at St. Charles. Ark.. 07077820



Pro perty

SC

SAR

so4

Cl

FC

TP

TNH

Period

All

All

All

All

All

All

All


1975-80

ID

1975-84

1975-85

1975-85

1975-85

1977-85


0.38

< .01

.12

.02

.46

< .01

Estimated trend

NS

+0.45

NS

- 3.5

NS

- .005


ID

ID

ID

ID

jn __ _J. U

jn __ _J. U

ID


--

__ __

77

Table 32. Results of Seasonal Kendall trend analysis for Big Creek near Watkins Corner. Ark. t 07077960

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SCL is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equation that could be used in flow adjustment was hyperbolic (HYP6). NONE indicates that none of the flow-adjusted equations were used. DL indicates that flow-adjustment procedures were not performed because more than 5 percent of the water-quality property data paired with discharge data were censored]



(inclu- __________sive)

Proba bility Estimated Water Equation of no trend years type trend (inclu- _____________sive)___________

Proba- bility of no trend

Esti mated trend

SC All 1975-80 0.16

SC Irrig. 1975-80 .23

SAR All ID

NS 1975-80 NONE

NS 1975-80 HYP6 0.60 0.77

ID

NS

SAR

SO^

so4

Cl

Cl

FC

FC

TP

TP

TNH

TNH

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

ID

1975-83

1975-83

1975-83

1975-83

1975-83

1975-80

1975-83

1975-83

1977-83

1977-83

1.00

.60

.01*

.21

< .01

.18

.22

< .01

.01

.60

NS

NS

-0.50

NS

-27.7

NS

NS

+ .022

- .017

NS

ID

1975-80

1975-80

1975-80

1975-80

1975-80

1975-80

1975-80

1975-80

ID

ID

NONE

DL

NONE

HYP6 .32 .89

NONE

NONE

HYP6 .07 .79

NONE

_ _ _ _ __

NS

NS

__

78

Table 33. Results of Seasonal Kendall trend analysis for White River at Arkansas Post Canal near Nady, Ark., 07078285

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; S(k is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected]


Pro perty

SC

SAR

so4

Cl

FC

TP

TNH

Period

All

All

All

All

All

All

All


1975-81

ID

1975-83

1975-83

1975-83

1975-83

1977-83


0.33

< .01

.53

< .01

.50

.15

Estimated trend

NS

+0.50

NS

- 5.0

NS

NS

Water Equation ? years type r (inclu sive)

ID

ID

ID

ID

ID

ID

ID


__ __

79

Table 34. Results of Seasonal Kendall trend analysis for Arkansas River at Murray Dam at Little Rock, Ark. t 07263450

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SO. is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were log-linear (LOGLIN), quadratic (QUAD), and hyperbolic (HYP5). NONE indicates that none of the flow-adjusted equations were used. DL indicates that flow-adjustment procedures were not performed because more than 5 percent of the water-quality property data paired with discharge data were censored]



(inclu- __________sive)

Proba- Proba- Esti- bility Estimated Water Equation 2 bility mated of no trend years type r of no trend trend (inclu- trend _____________sive)______________________

SC All 1975-83 0.92 NS 1975-83 HYP5 0.08 0.90 NS

SAR All ID ID

SOjj All 1975-85 .52 NS 1975-85 LOGLIN .21 .09 -1.36

Cl All 1975-85 .85 NS 1975-85 HYP5 .06 .59 NS

FC All 1975-85 .21 NS 1976-85 NONE

TP All 1975-85 .11 NS 1975-85 QUAD .40 .84 NS

TNH All 1977-85 .02 -0.005 1977-85 DL

80

Table 35. Results of Seasonal Kendall trend analysis for Arkansas River at David D. Terry Lock and Dam below Little Rock, Ark., 07263620

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SCL is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved cnloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31625), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were quadratic (QUAD), log-log (LOGLOG), and hyperbolic (HYP5-HYP7). NONE indicates that none of the flow-adjusted equations were used]

Raw data

Pro perty

SC

SC

SAR

SAR

SO^

so4

Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1977-85

1977-85

1975-85

1975-85

ID

ID


0.92

.28

.38

.59

.28

.61

.63

.41

< .01

< .01

.38

.22

Estimated trend

NS

NS

NS

NS

NS

NS

NS

NS

-131

-338

NS

NS


1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1975-85

1977-85

1977-85

1975-85

1975-85

ID

ID

Flow-adjusted data

Equation 2 type r

HYP5 0.06

NONE

LOGLOG .03

NONE

HYP6 . 05

NONE

HYP7 .03

NONE

NONE

NONE

NONE

QUAD . 18


0.82 NS

.72 NS

.14 NS

.87 NS

.77 NS

__

81

Table 36. Results of Seasonal Kendall trend analysis for Arkansas River at Lock and Dam 3 near Swan Lake, Ark., 07263750

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SCL is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equation that could be used in flow adjustment was hyperbolic (HYP7). NONE indicates that none of the flow-adjusted equations were used]


Pro perty

SC

SAR

so4

Cl

FC

TP

TNH

Water Period years

(inclu sive)

All

All

All

All

All

All

All

1975-81

ID

1975-83

1975-83

1975-83

1975-83

1977-83


0.20

.09

.02

< .01

.06

.38

Proba-Estimated Water Equation 2 bility

trend years type r of no (inclu- trend sive)

NS

+ 1.61

+7.54

-22.7

+ .004

NS

1975-81

ID

1975-83

1975-83

1975-83

1975-83

1977-83

HYP7 0.10 0.12

HYP7 .16 .49

HYP7 .07 .01

NONE

NONE

NONE

Estimated trend

NS

NS

+6.00

82

Table 37. Results of Seasonal Kendall trend analysis for Bayou Metonear Lonoke. Ark., 07264000

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SCL is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equation that could be used in flow adjustment was hyperbolic (HYP7). NONE indicates that none of the flow-adjusted equations were used]

Raw data

Pro perty

SC

SC

SAR

SAR

so4

so4

Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1975-81

1975-81

ID

ID

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1977-83

1977-83


0.38

.08

.22

1.00

.40

.87

< .01

.23

.35

.28

.17

.59


Estimated Water Equation bility trend years type r of no

(inclu- trend sive)

NS

-53.4

NS

NS

NS

NS

-27.4

NS

NS

NS

NS

NS

1975-81

1975-81

ID

ID

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1977-83

1977-83

NONE

NONE

HYP7 0.08 0.60

NONE

NONE

NONE

NONE

NONE

HYP7 .04 .83

NONE

NONE

NONE

Estimated trend

NS

NS

83

Table 38. Results of Seasonal Kendall trend analysis for Bayou Two Prairie near Cabot. Ark. t 07264050

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SOj. is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were log-linear (LOGLIN), log-log (LOGLOG), and hyperbolic (HYPS). NONE indicates that none of the flow-adjusted equations were used]


Pro perty

SC

SC

SAR

SAR

so4

so4

Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1975-81

1975-81

ID

ID

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1977-83

1977-83


0.24

.44

.04

.26

.75

.50

.28

.29

< .01

.03

.01

.12

Estimated trend

NS

NS

+0.42

NS

NS

NS

NS

NS

+ .032

+ .064

+ .071

NS


1975-81

1975-81

ID

ID

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1975-83

1977-83

1977-83

Equation 2 type r

LOGLOG 0.74

LOGLIN .44

NONE

NONE

LOGLOG .53

HYP8 .16

NONE

NONE

NONE

NONE

NONE

NONE


Esti mated trend

0.05 Increase

1.00

.31

.30

--

NS

NS

NS

84

Table 39. Results of Seasonal Kendall trend analysis for Bayou Metonear Bayou Meto, Ark., 07265099

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SOj. is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31616), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were log-log (LOGLOG), and hyperbolic (HYP7-HYP8). NONE indicates that none of the flow- adjusted equations were used]



(inclu- __________sive)

Proba-bility Estimated Water Equation of no trend years type trend (inclu- _____________ sive)

Proba- bility of no trend

Esti- mated trend

SC All 1975-80 0.66

SAR All ID

SOjj All 1975-85 .05

Cl All 1975-85 .28

FC All 1975-85 .69

TP All 1975-85 .31

TNH All 1977-85 < .01

NS 1975-80 HYP7 0.63 0.84 NS

ID

+0.35 1975-85 HYP8 .13 .07 +0.29

NS 1975-85 HYPS .38 .21 NS

NS 1975-85 NONE

NS 1975-85 LOGLOG .35 .15 NS

- .008 1977-85 NONE

85

Table 40. Results of Seasonal Kendall trend analysis for Arkansas River at Dam No. 2 near Gillett, Ark., 07265283

[Properties: SC is specific conductance, in microsiemens per centimeter at 25 degrees Celsius; SAR is sodium adsorption ratio; SCL is dissolved sulfate, in milligrams per liter (mg/L); Cl is dissolved chloride, in mg/L; FC is fecal- coliform bacteria (parameter code 31625), in colonies per 100 milliliters; TP is total phosphorus, in mg/L; and TNH is total ammonia, in mg/L. Information in "Period" column describes data included in trend analysis January through December (All) or June through September (Irrig.). Water year ranges indicated are generalized; some years within range shown may have no data. ID indicates that insufficient data were available. Estimated trend is the Seasonal Kendall Slope Estimator expressed in units per year; NS indicates that no significant (p<0.10) trend was detected. The regression equations that could be used in flow adjustment were log-log (LOGLOG), and hyperbolic (HYP5-HYP6). NONE indicates that none of the flow-adjusted equations were used]

Raw data

Pro perty

SC

SC

SAR

SAR

so4

so4

Cl

Cl

FC

FC

TP

TP

TNH

TNH

Period

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.

All

Irrig.


1975-85

1975-85

1979-85

1979-85

1975-85

1975-85

1975-85

1975-85

1979-85

1979-85

1975-85

1975-85

1977-81

1977-81


0.47

.78

< .01

.22

.50

.54

.80

.87

.57

1.00

.83

.74

.05

.16

Estimated trend

NS

NS

-0.25

NS

NS

NS

NS

NS

NS

NS

NS

NS

- .014

NS


1975-85

1975-85

1979-85

1979-85

1975-85

1975-85

1975-85

1975-85

1979-85

1979-85

1975-85

1975-85

1977-81

1977-81

Flow-adjusted data

Equation 2 type r

HYP5 0.10

NONE

LOGLOG .13

NONE

HYP6 .09

NONE

HYP6 .08

NONE

NONE

NONE

NONE

NONE

NONE

NONE


0.24 NS

< .01 Decrease

.21 NS

.37 NS

__

86

Table 41. Statistical summary of selected water-quality properties for St. Francis River at Fisk. Mo., 07040000

[N=number of observations, mm=millimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), and sediment particle-size distribution (percent)]

Property

Discharge*Dissolved oxygenPHSpecific conductanceSuspended sediment

concentrationfiner than 1 mm (fd)finer than 0.5 mm (fd)finer than 0.25 mm (fd)finer than 0.125 mm (fd)finer than 0.062 mm (fd)finer than 0.062 mm (sd)

Bed materialfiner than 16 mm (sd)finer than 8 mm (sd)finer than 4 mm (sd)finer than 2 mm (sd, fd)finer than 1 mm (sd, fd)finer than 0.5 mm (fd)finer than 0.25 mm (fd)finer than 0.125 mm (fd)finer than 0.062 mm (fd)

N

92929394

92828282828210

888888889090909090

25th Min- per- imum centile

384.86.079

111009444242132

100634233322915

11

1966.97.6151

3610010095817349

100100100100100965643

Median

9418.87.8190

4810010098938557

1001001001001009873106

Mean

1,7909.17.8190

6110010096877956

1009998989895711911

75th per-

centile

2,86011.28.0224

7010010099979165

10010010010010099863016

Stand ard

Max- devi- imum at ion

10,40014.88.7343

29210010010010010078

100100100100100100997458

2,1542.4.553

45018151813

059101011201812

^Includes only discharges corresponding to a water-quality sample.

87

Table 42. Statistical summary of selected water-quality properties for St. Francis River near Powe. Mo. t 07040057

[N=number of observations, mm=millimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 "Celsius), and sediment partice-size distribution (percent)]

Property




N

74000

7366666666667

696969697171717171

25th Min- per- imum centile Median

82

171009456191729

1001001001009780500

282

6510010095676043

1001001001001009536

11

1,220

9910010098857857

100100100100100985332

Mean

1,970

23910010095797354

100100100100100965154

75th per-

centile

3,160

21410010099959066

100100100100100996854

Stand ard


10,400

3,660100100100999968

100100100100100100963725

2,290 ----

486017182014

000014

2075


88

Table 43. Statistical summary of selected water-quality properties for St. Francis River near Glennonville, Mo.. 07040060

[N=number of observations, mm=millimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), and sediment particle-size distribution (percent)]

Property




N

82111

8276767576766

797979798080808080

Min imum

9612.36.2131

13100924598

49

10010010010097852500

25th per-

centile Median

37112.36.2131

7010010096645651

1001001001001009971

10

1,53012.36.2131

13910010098827459

1001001001001009978

11

Mean

2,46012.36.2131

30610010095766963

100100100100100997732

75th per-

centile

3,44012.36.2131

31110010099948972

100100100100100998432

Max imum

1 1 , 20012.36.2131

2,8701001001001009997

100100100100100100992828

Stand ard devi ation

2,680.0.0.0

480019

222417

0000021244


89

Table 44. Statistical summary of selected water-quality properties for Wilhelmina Cutoff near Campbell, Mo.. 07040070

[N=number of observations, nun=millimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius, and sediment particle-size distribution (percent)]

Property




N

83000

8377777777776

787878788181818181


109

191009767191434

10010010010099934700

338

10110010097594648

1001001001001009984

11

1,320

20410010098807066

100100100100100998921

Mean

2,420

40410010097746565

100100100100100998763

75th per-

centile

3,460

36110010099908283

1001001001001001009363

Max imum

1 1 , 900

7,430100100100999995

100100100100100100995726


2,770

865014

212321

0000019

104


90

Table 45. Statistical summary of selected water-quality properties for St. Francis River at St. Francis. Ark.. 07040100

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected, mm=millimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), trace metals and pesticides (total or total recoverable in micrograms per liter) and sediment particle-size distribu tion (percent). Alkalinity and hardness are reported as CaCO~, sulfate is reported as SO^., and the phosphorus and nitrogen species are reported as Pand N. Some discharge and other water-quality separate main-channel and overbank samples]

data are associated with

PropertyDischarge*Dissolved oxygenPHSpecific conductanceTotal alkalinityTotal hardnessDissolved magnesiumSodium adsorption ratioDissolved sulfateDissolved chlorideDissolved solidsTotal phosphorusTotal nitrite +

nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (3 1679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDDTDieldrinEndrinLindaneMala th ion

N951851831522351115

9597608747

8089961533397849934352578141414141414116

Min imum87

4.55.9653538

6.4.1

< 1.02.272

< .01< .05

< .101.1

2207.5

< 10< 20< 20< 20< 2014093

< 20< .002< .002< .004< .002< .002ND

< .05

25th percentile

4347.47.41355374

7.4.1

7.04.7111.09

< .05

< .102.3204022

< 10< 20< 20< 20< 201,300220

< 20< .002< .002< .004< .002< .002ND

< .05

Median1,3409.07.81867190

9.4.1

9.06.0128.13.09

< .103.051

21030

< 10< 20< 20< 20< 20

2,30034027

< .002< .002< .004< .002< .002ND

< .05

Mean2,360

9.27.71928194

10.3.1

9.67.8146.19.15

.083.1 46--__--21

3,20038051______ __

75th percentile

3,41010.98.0240100120

13.0.2

12.07.5163.19.25

< .103.6138

5,00050

< 10< 20< 2020

< 203,700

48053

< .002< .002< .004< .002< .002ND

< .05

Max imum

9,74014.68.8363180180

17.0.2

27.031.04681.90.49

.949.5

11,00030,000

34010

< 20< 20520300

27,0001,800650

< .002< .002

.010

.010< .002ND

< .05

Stan dard devi ation2,470

2.1.4713731

3.3.0

4.55.761.26.14

.131.1 56 59

3,90026092 __ __

91

Table 45. Statistical summary of selected water-quality properties forSt. Francis River at St. Francis, Ark.

Property

Methyl parathionToxaphene2,4-DSuspended sediment


Bed materialfiner than 16 mm (sd)finer than 8 mm (sd)finer than 4 mm (sd)finer than 2 mm (sd,fd)finer than 1 mm (sd,fd)finer than 0.5 mm (fd)finer than 0.25 mm (fd)finer than 0.125 mm (fd)finer than 0.062 mm (fd)

N

404024

19684848483846

878787878888888888

Min imum

<0.04< 2ND

271009677322248

1001009390896930

10

25th percentile

<0.04< 2ND

8610010098827462

1001001001001009780154

Median

<0.04< 2ND

15010010098948985

10010010010010099912918

, 07040 100- -Continued

Mean

--

24710010098878277

10010010010010097864027

75th per-

centile

<0.04< 2ND

226 210010099979587

10010010010010099976745

Max imum

<0.04< 2ND

,960100100100999989

100100100100100100999999

Stan dard devi ation

.. --

376013

151816

001125153028


92

Table 46. Statistical summary of selected water-quality properties for St. Francis River near Piggott. Ark.. 07040110

[N=number of observations, mm=millimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius, and sediment particle-size distribution (percent)]

Property

Discharge*Dissolved oxygenPHSpecific conductance

N

107000


48

336

1,000

Mean

1,790

75th per-

centile

2,740

Stand ard


7,940 --

1,920

Suspended sedimentconcentrationfinerfinerfinerfinerfinerfiner

thanthanthanthanthanthan

1 mm (fd)0.5 mm (fd)0.250.1250.0620.062

mm (fd)mm (fd)mm (fd)mm (sd)

107979797979711

21988222

11

44

9910010096746650

14010010098857761

2661009995827667

21310010099959182

9,62010010010010010094

923029

161818

Bed materialfinerfinerfinerfinerfinerfinerfinerfinerfiner

thanthanthanthanthanthanthanthanthan

1 6 mm8 mm4 mm2 mm1 mm

(sd)(sd)(sd)(sd, fd)(sd, fd)

0.5 mm (fd)0.250.1250.062

mm (fd)mm (fd)mm (fd)

95959595104104104104104

1009488847923300

100100100100998838

11

100100100100100945621

1001001001009991581915

1001001001001009878144

100100100100100100999794

01123

11273330


93

Table 47. Statistical summary of selected water-quality properties for St. Francis River at Holly Island. Ark.. 07040130

[N=nuraber of observations, mm=millimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius, and sediment particle-size distribution (percent)]

Property




N

101011

10091919191919

888888909696969696


20 6.8290

20999145201650

989285735844

100

482

6.8290

8510010095787266

100100100100977320

11

1,540 6.8290

11410010097938882

10010010010099904233

Mean

1,990

6.8290

19010010095868277

10010099989785451613

75th per-

centile

3,280 6.8290

20810010099979691

10010010010010097681813

Stand ard


5,620 6.8290

1,07010010010010010095

100100100100100100999896

1,650 .00

203019

161815

0135715292624


Table 48. Statistical summary of selected water-quality properties for Varney River near Senath, Mo.. 07040150

[Nmumber of observations, mm=millimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius, and sediment particle-size distribution (percent)]

Property

Stand- 25 th 75th ard

Min- per- per- Max- devi- N imum centile Median Mean centile imum ation

Discharge*Dissolved oxygenpHSpecific conductanceSuspended sediment



30303031

9555554

999999999

04.56.7144

7010010095766958

10010010010010098844210

06.27.5310

9310010097878166

10010010010010099947869

07.77.8328

237100100100989793

100100100100100100979185

217.87.8304

27910010099949186

100100100100100100968678

429.28.1336

317100100100999898

1001001001001001001009998

17512.39.6340

1,000100100100999998

1001001001001001001009999

412.0.555

288002101219

00000151928


95

Table 49. Statistical summary of selected water-quality properties for Big Slough Ditch near Paragould, Ark., 07040350


Property

Stand-25th 75th ard

Min- per- per- Max- devi- N imum centile Median Mean centile imum ation

Discharge* Dissolved oxygen pH Specific conductance Suspended sediment

concentrationfinerfinerfinerfinerfinerfiner


10.0.0.0.0.

mm (fd)5 mm (fd)25 mm (fd)125 mm (fd)062 mm (fd)062 mm (sd)

71 66 66 68

17999998

0 4.5 6.7 70

3910010097969274

0 7.8 7.7 284

6210010099979678

0 8.7 7.9 330

98100100100999985

133 9.0 7.9 303

28210010099989787

0 9.8 8.2 350

217100100100999998

3,030 14.0 8.5 430

2,00010010010010010099

429 1.9 .4 79

49000113

10Bed material

finerfinerfinerfinerfinerfinerfinerfinerfiner


1684210.0.0.0.

mm (sd)mm (sd)mm (sd)mm (sd, fd)mm (sd, fd)5 mm (fd)25 mm (fd)125 mm (fd)062 mm (fd)

171717171717171717

1001001001001009995206

10010010010010099988363

100100100100100100999692

100100100100100100998679

1001001001001001001009898

10010010010010010010010099

0000002

2027


96

Table 50. Statistical summary of selected water-quality properties for Locust Creek Ditch near Paragould, Ark.. 07040424


Property


concentrationfiner than 1 mm (fd)finer than 0.5 nun (fd)finer than 0.25 mm (fd)finer than 0.125 mm (fd)finer than 0.062 mm (fd)finer than 0.062 mm (sd)


N

64596262

8666662

888888888


03.96.269

571009995706452

100100100100100998464

07.27.4225

9510010097827952

100100100100100998784

Median

08.27.8315

18010010099939075

100100100100100100962816

75th per-

Mean centile

268.67.7290

17010010098908775

100100100100100100944438

09.98.0380

24010010099979598

100100100100100100999288

Stand ard


48222.08.9420

28710010099989898

100100100100100100999694

842.8.5

105

81002101233

0000006

4041


97

Table 51. Statistical summary of selected water-quality properties for Eightmile Ditch near Paragould. Ark., 07040428

[N=number of observations, mm=millimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 "Celsius, and sediment particle-size distribution (percent)]

Property




N

61586161

4235353535357

363636364040404040


04.66.260

291009528131327

1001001001009645

100

08.07.5231

531009880646131

1001001001009980611

Median

139.87.9280

7910010094858251

100100100100100871522

75th per-

Mean centile

349.57.8271

1261009987787358

100100100100100841954

2211.08.1311

14710010098958982

100100100100100932944

Stand ard


66914.09.4485

542100100100999699

10010010010010099877265

922.1.578

12001

18232329

00001

13171110


98

Table 52. Statistical summary of selected water-quality properties for St. Francis River at Lake City, Ark.. 07040450

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected, mm=millimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), trace metals and pesticides (total or total recoverable in micrograms per liter) and sediment particle-size distribu tion (percent). Alkalinity and hardness are reported as CaCO~, sulfate is reported as SOn, and the phosphorus and nitrogen species are reported as P and N. Some discharge and other water-quality data are associated with separate main-channel and overbank samples]

PropertyDischarge*Dissolved oxygenPHSpecific conductanceTotal alkalinityTotal hardnessDissolved magnesiumDissolved sulfateDissolved chlorideDissolved solidsTotal phosphorusTotal nitrite + nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (31679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDOTDieldrinEndrinLindaneMalathionMethyl parathionToxaphene2,4-D

N12822522720321509

999957964476104981236508056984156608644444444444415434323

Min imum1163.76.124326

4.8< 1.0

3.0106

< .01< .05< .10

.52

2010

< 10< 20< 20< 20< 2040032

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th per-

centile8186.37.41356372

8.07.05.5138.12

< .05< .10

2.1306730

< 10< 20< 20< 20< 201,600

160< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median1,2607.77.719210793

10.010.06.5164.18.09

< .102.68019540

< 10< 20< 20< 20< 20

3,800310

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean2,410

8.17.620210097

9.910.57.4181.20.16.112.7 64

3,90036023 __

75th per-

centile2,220

9.87.9267136129

11.512.08.0192.26.23.123.222335265

< 10< 20< 20< 20< 20

5,20054030

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

31,00014.58.838818021016.046.024.0960.60

1.00.815.5

3,50011,000

34010

< 20< 20

170< 20

15,000930110

< .002< .002

.004

.002

.002ND

< .05< .04

< 2ND


2.3.4814541

3.16.33.4112.11.19.130.9 69

2,80023020

99

Table 52. Statistical summary of selected water-quality properties forSt. Francis

Property

River at Lake City, Ark.

N


, 07040450 Continued

Mean

75th per- Max-

centile imum




10.0.0.0.0.

mm (fd)5 mm (fd)25 mm (fd)125 mm (fd)062 mm (fd)062 mm (sd)

12611111111111111116

19100925329177

591009994847750

10310010097938973

1171009994878366

13510010099969586

72910010010010010090

93017151723



1684210.0,0.0.

mm (sd)mm (sd)mm (sd)mm ( sd , f d )mm ( sd , f d )5 mm (fd)25 mm (fd)125 mm (fd)062 mm (fd)

115116116116120120120120120

10098969289501600

100100100100100945221

10010010010099986863

1001001001001009566117

1001001001001009980169

100100100100100100977473

000127181311

*Includes only discharges corresponding to a water-quality sample.

100

Table 53. Statistical summary of selected water-quality propertiesfor St. Francis River at Lake City, Ark., 07040450 (Junethrough September) Cont inued

Property

Toxaphene 2,4-D Suspended sediment



100000

mm (fd).5 mm (fd).25 mm (fd).125 mm (fd).062 mm (fd).062 mm (sd)

N

2611

3733333333334


< 2 ND

301009580675780

< 2 ND

6910010097898582

< 2 ND

9110010098969388

75th per-

Mean centile

10510010097928987

< 2 ND

12010010099989690

Stan dard


< 2 ND

342100100100999890

58014894



16 mm (sd)84210000

mm (sd)mm (sd)mm (sd,fd)mm (sd,fd).5 mm (fd).25 mm (fd).125 mm (fd).062 mm (fd)

343434343535353535

10010010010098502700

100100100100100955021

100100100100100987363

1001001001001009568106

1001001001001009984167

100100100100100100934232

000009

20117

"Includes only discharges corresponding to a water-quality sample,

102

Table 53. Statistical summary of selected water-quality properties for St. Francis River at Lake City, Ark.. 07040450 (June through September)

[Nmumber of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected, mm=millimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), trace metals and pesticides (total or total recoverable in micrograms per liter), and sediment particle-size distribution (percent). Alkalinity and hardness are reported as CaCCL, sulfate is reported as SCL, and the phosphorus and nitrogen species are reported as P and N]

Property

25th Min- per-

N imum centile Median

75th per-

Mean centileMax imum

Standard devi ation

Discharge* 41 Dissolved oxygen 74 pH 72 Specific conductance 64 Total alkalinity 6 Total hardness 14 Dissolved magnesium 3 Dissolved sulfate 35 Dissolved chloride 36 Dissolved solids 19 Total phosphorus 32 Total nitrite + 15

nitrateTotal ammonia 27 BOD 36 Fecal coliforms(3l6l6) 35 Fecal strep.(31679) 5 Turbidity 13 Arsenic 16 Cadmium 28 Chromium 19 Copper 35 Lead 13 Iron 18 Manganese 19 Zinc 32 Aldrin DDE DOTDieldrin Endrin Lindane Malathion Methyl parathion

2123.77.21284349

8.01.04.5117.01.05 <

.10 <.93

9020

< 10 << 20 << 20 << 20 << 20 <1,500 3

160< 20 <

26 < .00226 .00226 .00426 < .00226 .00226 ND9 < .05

26 < .04

494 8795.2 6.07.5 7.7170 24691 10976 104

8.0 9.05.0 7.06.5 7.5152 171.15 .20.05 .07

.10 < .102.3 2.744 120140 20030 4010 < 1020 < 2020 < 2020 < 2020 < 20

,000 4,000380 54020 < 20

< .002 < ,< .002 < ,< .004 < ,< .002 < ,< .002 < ,

1,0806.07.8242119106

11.07.69.2220.21.10

.102.8 46

4,60053025

,002.002,004.002.002

ND ND< .05 << .04 <

.05

.04

1,330 4,3606.7 8.78.0 8.5305 388168 180123 210

16.0 16.010.0 16.011.4 24.0203 960.26 .60.15 .36

.12 .533.4 5.5250 600305 37060 85

< 10 < 10< 20 < 20< 20 < 20< 20 170< 20 < 20

5,600 15,000 2680 93040 80

< .002 < .002 < .002 < .002 < .004 < .004 < .002 .002 < .002 < .002

ND ND < .05 < .05 < .04 < .04

8151.1.3764940

4.43.24.7185.11.08

.10.9 20

,90019020

101

Table 54. Statistical summary of selected water-quality properties for Cockle Burr Slough Ditch near Monette, Ark.. 07040496


Property




N

65616363

2928282828280

282828282828282828


04.87.0155

2610095916447--

100100100100100957041

07.17.9390

44100100979483

1001001001001009885177

Median

07.98.1409

51100100999691

10010010010010099943413

75th per-

Mean centile

1198.18.0391

67100100989486

10010010010010099914119

2139.28.2418

681001001009895--

100100100100100100986020

Stand ard


55811.88.5462

242100100100100100

100100100100100100999888

1851.7.352

47012814

0000018

2720

^Includes only discharges corresponding to a water-quality sample,

103

Table 55. Statistical summary of selected water-quality properties for Right Hand Chute of Little River at Big Lake Outlet near Manila. Ark., 07046500

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 "Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness are reported as CaCO~, sulfate is reported as SOn, and the phosphorus and nitrogen species are reported as P and N]

PropertyDischarge*Dissolved oxygenPHSpecific conductanceTotal alkalinityTotal hardnessDissolved magnesiumDissolved sulfateDissolved chlorideDissolved solidsTotal phosphorusTotal nitrite +

nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (31679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDOTDieldrinEndrinLindaneMalathionMethyl parathionToxaphene2,4-D

N0

1051017722519

9999589644

7710210011355486571044363679245454544454516434322

Min imum

2.76.7371532

5.02.01.4103.06

< .05

< .10.9

13

6.8< 10< 20< 20< 20< 20220

< 27< 20

< .002< .002< .004< .002< .002

ND< .05< .04

< 2ND

25th per-

centile

6.27.51907184

8.010.08.0171.12

< .05

< .102.0

85020

< 10< 20< 20< 20< 20

94078

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median

8.07.8269951309.014.013.0207.19.05

< .102.3207325

< 10< 20< 20< 20< 20

2,000140

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean

8.17.7261104126

10.614.512.5200.22.17

.112.6 62

3,10016029

75th per-

centile

10.08.0338140168

15.018.016.0233.26.30

.163.05312080

< 10< 20< 20< 20< 20

4,40020030

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

13.18.344619026417.028.023.0321.63.92

.696.6405

5,40034019203011050

15,000460610

< .002< .002< .004

.010

.002ND

< .05< .04

4ND


2.4.4994751

4.15.94.947.14.23

.121.1 78

3,2009971

MIncludes only discharges corresponding to a water-quality sample.

104

Table 56. Statistical summary of selected water-quality properties for Right Hand Chute of Little River at Rivervale, Ark.. 07046600


Property

25thMin- per-


75th per-

Mean centile

Stand ard

Max- devi- imum ation

Discharge* 96 111 642Dissolved oxygen 93 5.0 7.1pH 96 5.7 7.7Specific conductance 96 64 246 Suspended sediment

concentration 96 34 59finer than 1 mm (fd) 83 97 100finer than 0.5 mm (fd) 83 97 100finer than 0.25 mm (fd) 83 70 96finer than 0.125 mm (fd) 83 38 89finer than 0.062 mm (fd) 83 32 83finer than 0.062 mm (sd) 13 29 63

Bed materialfiner than 16 mm (sd) 92 100 100finer than 8 mm (sd) 92 100 100finer than 4 mm (sd) 92 100 100finer than 2 mm (sd, fd) 92 97 100finer than 1 mm (sd, fd) 95 96 100finer than 0.5 mm (fd) 95 61 96finer than 0.25 mm (fd) 95 2 49finer than 0.125 mm (fd) 95 0 9finer than 0.062 mm (fd) 95 0 4

1,560 3,2708.4 8.68.0 7.9337 317

11710010098969179

10010010010010098793117

18210010097918774

10010010010010096703525

3,76010.08.2407

26710010099989792

10010010010010099935634

26,30013.28.6560

80610010010010010094

100100100100100100100100100

4,7102.0.5

114

162015

111420

000016

273026


105

Table 57. Statistical summary of selected water-quality properties for Pemiscot Bayou at Dell t Ark., 07047400

[Nmumber of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (micro- Siemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinityand hardness are reported as CaCO~, sulfate is reported phosphorus and nitrogen species are reported as P and N]

as SO, and the


nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (31679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDDTDieldrinEndrinLindaneMalathionMethyl parathionToxaphene2,4-D

N3797945720508

9292578643

7494901135488254993957608737373837383715373924

25th Min- per- imum centile0.43.56.9666556

12.03.33.0127.13

< .05

< .10.82

203.0

< 10< 20< 20< 20< 20710180

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

8.47.07.5270154122

12.716.09.0238.42.37

< .103.8455915

< 10< 20< 20< 20< 201,800360

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median20

9.17.7444205178

17.523.511.5277.70.63

.315.42859025

< 10< 20< 20< 20< 20

2,60052030

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

75th per-

Mean centile49

9.87.7396190167

16.724.112.12691.01.65

.416.1 869 2926

5,00058071

4812.07.949723620619.028.815.03011.16.90

.547.99203303512

< 20< 20

3020

4,10079080

< .002< .002< .004< .002< .002

ND< .05< .04

< 2ND

Max imum194

20.29.2137025928022.068.040.0458

4.601.90

3.8022.0

40,00027,0001,000

342035

269320

50,0001,500820

< .002< .002< .004

.030

.010ND

< .05.04

< 2ND


643.7.4

2005553

3.511.45.652.92.40

.513.4

2307 4669

7,600270117


106

Table 58. Statistical summary of selected water-quality properties for Tyronza River near Twist. Ark., 07047700

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness are reported as CaCCL, sulfate is reported as SOn, and the phosphorus and nitrogen species are reported as P and N]


nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (31679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDDTDieldrinEndrinLindaneMa lath ionMethyl parathionToxaphene2^4-D

N0

94916020458

91 <89548642 <

70 <92828

32488353965059628541 <41 <42 <41 <42 <4215 <41 <4123

Min imum

3.56.7432836

7.71.02.0134.06.05

.10.2210

9.5< 10< 20< 20< 20< 20

30< 27< 20.002.002.004.002.002ND.05.04< 2

ND

25th per-

centile

7.17.7290130110

11.019.06.0245.17

< .05

< .102.2405230

< 10< 20< 20< 20< 202,200

230< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median

7.97.947119520818.032.07.5306.26.08

< .103.211012250

< 10< 20< 20< 20< 20

4,40031040

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean

8.47.8410192194

20.630.68.8293.38.33

.123.2

250__ 2634

6,50032065 __

75th per-

centile

10.08.0543266270

27.738.08.5343.44.47

.154.0355280300

< 10< 20< 20

3020

8,60039082

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

14.08.3739280360

40.0110.0145.05021.852.30

.517.0

4,200490

2,70016

< 2048

230957

30,0001,000350

< .002< .002< .004

.010

.010ND

< .05.14

4ND


2.0.4

1727883

10.716.914.8

73.37.47

.111.3

530 35

1366,200

15075 ____


107

Table 59. Statistical summary of selected water-quality properties for St. Francis River at Parkin, Ark. t 07047800

[N=number of observations, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.=streptococci, BTM=bottom material, ND=not detected, mm=millimeter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conduct ance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), trace metals and pesticides (total or total recoverable in micrograms per liter), and pesticides in bottom material (total in micrograms per kilogram). Alka linity and hardness are reported as CaCOS, sulfate is reported as SOj,., silica is reported as SiOp, and the phosphorus and nitrogen species are reported as P and N]

PropertyDischarge*Dissolved oxygenpHSpecific conductanceTotal alkalinityTotal hardnessDissolved calciumDissolved magnesiumDissolved sodiumSodium adsorption ratioDissolved potassiumDissolved sulfateDissolved chlorideDissolved fluorideDissolved silicaDissolved solidsTotal phosphorusTotal nitrogenTotal organic

nitrogenTotal nitrite + nitrateTotal ammoniaFecal coliforms(3l625)Fecal strep. (31673)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinAldrin in BTM

N102871021021011021021021021021021021021021021011027743

83487564583031313116313131268

25th Min- per- imum centile2883.86.9651727

7.31.82.5.2.3

< 5.02.4

< .14.143.10.47.24

< .10< .01

115

2.82

< 20< 20< 20

21,500

120< 20

< 0.01< .1

9666.27.62138393

25.06.86.5.3

2.314.04.7.1

11.0137.23

1.10.77

.20

.0367170383

< 20< 20< 20

62,800

26030

< 0.01< .1

Median1,6757.57.8308130140

38.011.08.9.3

2.719.06.1.2

14.0188.32

1.701.20

.41

.09170400885

< 20< 20< 20

117,600

32060

< 0.01< .1

75th per-

Mean centile2,329

7.97.7300131139

38.810.38.4.3

2.718.26.4.2

13.6187.43

1.971.28

.58

.12 160

5 142115

8,10032069

2,8209.28.0394172180

51.314.010.0

.43.0

22.08.0.2

17.0236.53

2.501.60

.76

.19430

1,450220

7< 20

202721

12,00037080

< 0.01< .1

Max imum

11,80012.68.451625025071.019.014.0

.95.433.0

13.6

23.0302

5.306.102.50

4.30.50

3,400169,000

80010

< 204012053

20,000670300

< 0.01< .1


2.1.3

1135857

16.14.22.6.1.8

5.52.2.1

4.064.53

1.19.59

.61

.11 190

2 8

2212

5,40010052-___

108

Table 59. Statistical summary of selected water-quality properties forSt. Francis

PropertyChlordaneChlordane in BTMDDDDDD in BTMDDEDDE in BTMDDTDDT in BTMDiazinonDizainon in BTMDieldrinDieldrin in BTMEn do su If anEndosulfan in BTMEndrinEndrin in BTMEthionEthion in BTMHeptachlorHeptachlor in BTMHeptachlor epoxideHeptachlor epoxide in BTMLindaneLindane in BTMMa lath ionMa lath ion in BTMMethoxychlorMethoxychlor in BTMMethyl parathionMethyl parathion in BTMMethyl trithionMethyl trithion in BTMMirexMirex in BTMParathionParathion in BTMPerthaneSilvexToxapheneToxaphene in BTMTrithionTrithion in BTM2,4-D2,4,5-TSuspended sediment

concentrationfiner than 0.062 mm (sd)

River at Parkin, Ark.

25th Min- per-

N imum centile Median268

264

264

265

266

26812

268

266

268

268

268

266

268

266

26612

2661

14268

2661414

9696

< .1< 1.0< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1

< .01< .1< .01< .1< .01< .1< .01< .1

< .01< .1

< .01ND

< .01< .1

< .01< .11< .01< .1

< .01< .1

< .01ND

< .1< .01

< 1<10

< .01< .1

< .01< .01

1424

< .1< 1.0< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1

< .01< .1< .01< .1< .01< .1< .01< .1

< .01< .1

< .01ND

< .01< .1

< .01< .1< .01< .1

< .01< .1

< .01ND

< .1< .01

< 1<10

< .01< .1

< .01< .01

9788

< .1< 1.0< .01< .1< .01< .1< .01< .1< .01< .1< .01

.6< .01< .1

< .01< .1< .01< .1< .01< .1< .01< .1

< .01< .1

< .01ND

< .01< .1

< .01< .1< .01< .1

< .01< .1

< .01ND

< .1< .01

< 1<10

< .01< .1

< .01< .01

17496


Mean ____ 1.2 __ __ ______ __ ____ __

29490

75th per-

centile< .1< 1.0< .01

10< .015.0

< .0114

< .01< .1< .01

1.8< .01< .1< .01

.1< .01< .1< .01< .1< .01< .1

< .01< .1

< .01ND

< .01< .1

< .01< .1< .01< .1

< .01< .1

< .01ND

< .1< .01

< 1190

< .01< .1

< .01< .01

37698

Max imum

< .17.0.01

14< .01

6.6.06

27.02

< .1.02

4.0< .01< .1

.031.8.01

< .1.01.1.01.6

.01< .1

< .01ND

< .01< .1

.50< .1< .01< .1

< .01< .1

< .01ND

< .1< .01

< 1410

< .01< .1

.46

.01

1,500100

Stan dard devi ation---.--.--.___-----_-.--_--1.3 ---------_---- --______ -- __________ ---___----

28916

Includes only discharges corresponding to a water-quality sample.

109

Table 60. Statistical summary of selected water-quality properties for St. Francis River at Parkin. Ark., 07047800 (June through September)

[Nmumber of observations, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.=streptococci, BTM=bottom material, ND=not detected, mm=millimeter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), trace metals and pesticides (total recoverable in micrograms per liter), and pesticides in bottom material (total in micrograms per kilogram). Alkalinity and hardness are reported as CaCO~, sulfate is reported as SOj,, silica is reported as SiOp, and the phosphorus and nitrogen species are reported as phosphorus ana nitrogen.]

PropertyDischarge*Dissolved oxygenPHSpecific conductanceTotal alkalinityTotal hardnessDissolved calciumDissolved magnesiumDissolved sodiumSodium adsorption ratioDissolved potassiumDissolved sulfateDissolved chlorideDissolved fluorideDissolved silicaDissolved solidsTotal phosphorusTotal nitrogenTotal organic

nitrogenTotal nitrite + nitrateTotal ammoniaFecal coliforms(3l625)Fecal strep. (31673)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinAldrin in BTM

N31273131313131313131313131313131312614

26142218187888488892

Min imum

3203.87.0901839

10.03.45.0.2

1.8< 5.0

3.8< .1

6.792.12.53.70

< .10< .01

1688225

< 20< 20< 20

21,700

16030

< .01< .1

25th per-

centile9235.57.6260114120

32.09.27.8.3

2.313.05.0.2

13.0159.24

1.10.85

< .10.0364142475

< 20< 20< 20

35,300

23038

< .01< .1

Median1,5806.07.9350155160

44.012.010.0

.32.717.06.3.2

15.0211.32

1.601.20

.26

.08100375666

< 2020

< 208

7,90034065

< .01< .1

Mean1,9605.97.8338148157

43.311.79.5.3

2.716.96.8.2

14.6208.38

2.001.28

.49

.12 125

7 __197

8,50032060

75th per-

centile2,250 10

6.48.1423186190

52.014.011.0

.43.0

21.08.6.3

17.0252.49

2.501.60

.59

.23450 3635 169163

9< 20 <

202610

12,000 1541070

< .01 << .1 <

Max imum

,2007.78.351625025068.019.014.0

.93.7

29.013.0

.620.03001.106.102.10

4.30.35

,400,000620

920204010

,00042090

.01.1


.9

.3985250

13.93.72.3.1.5

5.62.2

.13.056.19

1.33.45

.83

.11 140

2 __114

4,3009521

110

Table 60. Statistical summary of selected water-quality propertiesfor St. Francis River at Parkin, Ark,., 07047800 (June throughSeptember) Cont inued

PropertyChlordaneChlordane in BTMDDDDDD in BTMDDEDDE in BTMDDTDDT in BTMDiazinonDiazinon in BTMDieldrinDieldrin in BTMEn do su If anEndosulfan in BTMEndrinEndrin in BTMEthionEthion in BTMHeptachlorHeptachlor in BTMHeptachlor epoxideHeptachlor epoxide in BTMLindaneLindane in BTMMalathionMa lath ion in BTMMethoxychlorMethoxychlor in BTMMethyl parathionMethyl parathion in BTMMethyl trithionMethyl trithion in BTMMi rexMirex in BTMParathionParathion in BTMPerthaneSilvexToxapheneToxaphene in BTMTrithionTrithion in BTM2,4-D2,4,5-TSuspended sediment con

centration finer than0.062 mm (sd)

N92919191929200919292929292929292009204929244

3030


< .1< 1.0< .01< .1< .01< .1< .01< .1< .01< .1< .01

1.1 --

< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1

< .01< .1

< .01< .1

----

< .01< .1

....

< .01< 1< 10< .01< .1< .01< .01

4765

< .1< 1.0< .01< .1< .01< .1< .01< .1< .01< .1< .01

1.1----

< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1

< .01< .1

< .01< .1

< .01< .1

< .01< 1< 10< .01< .1< .01< .01

9690

75th per-

Median Mean centile< .1< 1.0< .01< .1< .01< .1< .01< .1< .01< .1< .012.6 2.6

< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1

< .01< .1

< .01< .1

____

< .01< .1

....

< .01< 1

120< .01< .1< .01< .01

146 26196 93

< .1< 1.0< .01< .1< .01< .1< .01< .1< .01< .1< .01

4.0----

< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1

< .01< .1

< .01< .1 --

< .01< .1

__

< .01< 1250

< .01< .1< .01< .01

37198

Max imum

< .1< 1.0< .01< .1< .01< .1< .01< .1< .01< .1< .01

4.0 .03

< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1

< .01< .1

< .01< .1

< .01< .1

< .01< 1250

< .01< .1< .01< .01

1,510100


2.0

2868

Includes only discharges corresponding to a water-quality sample, 111

Table 61. Statistical summary of selected water-quality properties for St. Francis River Floodway near Marked Tree. Ark.. 07047810


Property




N

199949796

19417617617617617618

185186185186192192192192192


04.55.766

281009356261219

533834323124

100

4896.97.4140

871009991757156

100100100100999032

11

1,7008.27.7211

13610010097908579

100100100100100955063

Mean

2,9108.67.7218

1611009993838070

999897969591511915

75th per-

centile

4,38010.58.0289

19910010099979587

10010010010010098743022

Max imum

15,00014.68.6403

55610010010010010094

100100100100100100989693


3,1702.3.587

104019171923

5912141414262522


112

Table 62. Statistical summary of selected water-quality properties for Cross County Ditch near Birdeye, Ark., 07047815


Property




N

92111

92828282828210

878787879090909090


778.08.2289

261009447768

10060585149331400

1,1108.08.2289

891009994665722

1001001001001009650

10

3,2508.08.2289

16410010097837762

100100100100100986521

Mean

5,7208.08.2289

2381009994787253

100999998989663118

75th per-

centile

8,7908.08.2289

26310010098949082

100100100100100997762

Max imum

26,1008.08.2289

2,150100100100999989

100100100100100100999593


6,040.0.00

277018192130

057589

202421

^Includes only discharges corresponding to a water-quality sample

113

Table 63. Statistical summary of selected water-quality properties for Straight Slough near Birdeye, Ark., 07047882

[N=number of observations, mm=inillimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius, and sediment particle-size distribution (percent)]

Property




N

74707473

64535353535311

616161626464646464


04.56.071

31100945543

39

28151411118300

1067.67.6269

5610010095826953

10086768190853321

Median

2169.17.9392

9810010098939077

100100100100100988033

75th per-

Mean centile

6328.97.8349

2351009994857974

91858282828063118

38810.08.2461

28210010099979593

1001001001001009990149

Stand ard


9,55012.38.8522

1,900100100100999999

100100100100100100989795

1,4001.8.5

135

346019

202220

182732333333321815


114

Table 64. Statistical summary of selected water-quality properties for St. Francis Bay at Riverfront. Ark.. 07047900

[N=number of observations, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.=streptococci, mm=millimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 "Celsius), bacteria (colonies per 100 milliliters), turbid ity (nephelometric turbidity units), trace metals and pesticides (total or total recoverable in micrograms per liter), and sediment particle-size distribution (percent). Alkalinity and hardness are reported as CaCO~, sulfate is reported as SOu, silica is reported as SiOp, and the phosphorus and nitrogen species are reported as P and N. Some discharge and other water-quality data are associated with separate main-channel and overbank samples]


nitrogenTotal nitrite + nitrateTotal ammoniaFecal coliforms(3l625)Fecal strep. (31 673)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZinc

N200186202202107106107106107106107107 <107107 <1071071077643

82 <48 <8070643031313115313030

Min imum1584.55.66824277.02.31.5.1.2

5.02.8.1

3.955.04.24.20

.10

.0153

1.51

< 20< 20< 20

387070

< 20

25th percentile

1,1407.27.51786878

20.16.35.2.3

1.911.05.0.1

9.0111.15.82.64

< .10.022351252

< 20< 20< 20

51,900

16020

Median3,120

8.57.8246102110

29.09.06.9.3

2.214.06.1.2

12.0152.21

1.10.95

.17

.0666190582

< 20< 20< 20

103,500

21050

75th per-

Mean centile6,080

8.87.8257110116

31.59.27.4.3

2.215.06.6.2

11.8160.25

1.27.96

.24

.09 793 15165

4,60024049

3,15010.28.1328150150

41.012.09.2.4

2.419.07.7.2

14.0201.30

1.601.30

.32

.14170

1,000110

4< 20202014

5,40030060

Max imum

39,00013.88.6474214230

65.016.014.0

.54.7

30.013.0

.622.0290.68

3.301.90

1.10.37

4,30020,000

3107

< 203011018

19,000670170


1.9.4

1005149

13.93.52.8.1.7

5.32.2.1

3.958.14.65.40

.22

.08 72

1 6

2248

3,90012031

115

Table 64. Statistical summary of selected water-quality properties forSt. Francis Bay at Riverfront, Ark. , 07047900 Continued

Property N

Aldrin 0 DDE 0 DOT 0 Dieldrin 0 Endrin 0 Lindane 0 Malathion 0 Methyl para th ion 0 Toxaphene 02,4-D 0Suspended sediment 197

concentration 96finer than 1 mm (fd) 89finer than 0.5 mm (fd) 89finer than 0.25 mm (fd) 89finer than 0.125 mm (fd) 89finer than 0.062 mm (fd) 89finer than 0.062 mm (sd)110

Bed materialfiner than 16 mm (sd) 90finer than 8 mm (sd) 90finer than 4 mm (sd) 90finer than 2 mm (sd,fd) 90finer than 1 mm (sd,fd) 93finer than 0.5 mm (fd) 93finer than 0.25 mm (fd) 93finer than 0.125 mm (fd) 93finer than 0.062 mm (fd) 93


2114

1009666252421

10010010010097821600

I 879710010095746469

1001001001001009744

11

Median

14417410010098867884

100100100100100996021

Mean

I 19329410010095807479

1001001001001009860117

Stan- 75th dard per- Max- devi- centile imum ation

23937610010099959093

100100100100100997964

959 162

1,500 289100 0100 1100 7100 18100 20100 18

100 0100 0100 0100 0100 0100 399 2397 2395 17


116

Table 65. Statistical summary of selected water-quality properties for St. Francis Bay at Riverfront, Ark.. 07047900 (June through September)

[N=number of observations, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.=streptococci, mm=millimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimer at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter), and sediment particle-size distribution (percent). Alkalinity and hardness are reported as CaCCL, sulfate is reported as SCL, silica is reported as SiOp, and the phosphorus and nitrogen species are reported as P and N. Some discharge and other water-quality data are asso ciated with separate main-channel and overbank samples]


nitrogenTotal nitrite + nitrateTotal ammoniaFecal coliforms(3l625)Fecal strep. (31673)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZinc

N66596363323132313231323232323232322414

241425212178884888

Min imum1585.05.61103146

12.03.93.5.2

1.1< 5.0

3.7< .1

7.693.10.24.20

< .10< .01

55

1.53

< 20< 20< 20

32,100

16030

25th percentile

9376.67.8245105110

28.39.06.9.3

1.910.55.8.2

12.3149.18.76.61

< .10.023340303

< 20< 20< 20

43,200 4

20040

Median1,9607.28.2301134140

38.011.08.6.3

2.214.57.1.2

14.5180.22

1.05.93

.14

.066780524

< 20< 20< 20

8,600 430050

Mean2,7607.38.0300135138

37.810.98.7.3

2.214.77.3.2

14.3188.24

1.24.91

.17

.07----644

_-__--8

,80030051

75th per-

centile3,490

8.08.3373180180

48.514.010.7

.42.418.88.6.2

16.0237.27

1.751.25

.21

.13109235765

< 2020

< 2013

6,40039060

Max imum

13,60010.88.6460210220

62.016.013.0

.54.7

29.013.0

.622.0290.53

3.301.50

1.00.23

4,30020,000

3107

< 20203014

8,10042080


1.1.5854543

12.73.02.5.1

0.66.32.1.1

3.153.10.70.42

.1.07 70

1 4

2,0009916

117

Table 65. Statistical summary of selected water-quality propertiesfor St. Francis Bay at Riverfront, Ark., 07047900 (June throughSeptember) Continued

Property

Aldrin DDE DDT Dieldrin Endr in Lindane Mala th ion Methyl parathion Toxaphene 2,4-D Suspended sediment



100000

mm (fd).5 mm (fd).25 mm (fd).125 mm (fd).062mm (fd).062 mm (sd)

25th Min- per-

N iraum centile Median

0 0 0 0 0 0 0 0 0 0

62313131313132

351009769252439

9310010097817678

13710010098908588

75th per-

Mean centile

17310010095858084

19410010099969395

Max imum

875100100100999999


144018181815



16 mm (sd)84210000

mm (sd)mm (sd)mm (sd,fd)mm (sd,fd).5 mm (fd).25 mm (fd).125 mm (fd).062 mm (fd)

313131313131313131

100100100100100821600

1001001001001009841

11

1001001001001009959

11

100100100100100985697

100100100100100997041

100100100100100100999795

000003

222319


118

Table 66. Statistical summary of selected water-quality properties for Clark Corner Cutoff near Colt, Ark.. 07047904


Property


concentrationfiner than 1 mm (fd)finer than 0.5 mm (fd)finer than 0.25 mm (fd)finer than 0.125 ram (fd)finer than 0.062 mm (fd)finer than 0.062 mm (sd)

Bed materialfiner than 16 mm (sd)finer than 8 mm (sd)finer than 4 mm (sd)finer than 2 mm (sd, fd)finer than 1 ram (sd, fd)finer than 0.5 mm (fd)finer than 0.25 mm (fd)finer than 0.125 mm (fd)finer than 0.062 mm (fd)

N

81100

81696969696912

626262626565656565


2219.6

291009059464252

1001001001009754

100

1,2409.6

8510010095807374

100100100100100841922

3,9609.6

14810010098928778

100100100100100966083

Mean

7,0309.6

2021009995868178

1001001001001009050147

75th per-

centile

9,6209.6

26210010099979486

10010010010010099782110

Max imum

35,5009.6 --

985100100100999994

100100100100100100988134


7,800.0

168029151711

00001

1232157


119

Table 67. Statistical summary of selected water-quality properties for St. Francis River at Madison, Ark.. 07047907

[N=number of observations, inm=millimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius, and sediment particle-size distribution (percent)]

Property



Bed materialfiner than 16 mm (sd)finer than 8 mm (sd)finer than 4 mm (sd)finer than 2 mm (sd,fd)finer than 1 mm (sd,fd)finer than 0.5 mm (fd)finer than 0.25 mm (fd)finer than 0.125 mm (fd)finer than 0.062 mm (fd)

N

100979999

99878787878712

898989899595959595


983.76.465

221009549393845

100856248459300

1,0106.87.4171

8810010096908480

10010010010098691621

3,0408.27.9231

12910010098969285

100100100100100833463

Mean

5,8808.67.8246

18610010095918781

1001009998978041158

75th per-

centile

8,78010.48.1319

22910010099989793

1001001001001009362187

Max imum

34,20013.68.5458

633100100100999998

100100100100100100999588


6,8002.1.497

145019121417

0268918302114


120

Table 68. Statistical summary of selected water-quality properties for L'Anguille River near Cherry Valley. Ark., 07047936

[N=nurober of observations, mm=millimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius, and sediment particle-size distribution (percent)]

Property




N

63626262

6262626262620

575757585858585858


02.26.792

3510091877673--

463426201713922

424.17.1117

120100100989794--

1001008479746248118

Median

1255.77.3163

173100100999897

1001001001009996672418

75th per-

Mean centile

1896.27.4217

178100100989795

979387858480623329

2178.37.7267

225100100999999

10010010010010099794844

Stand ard


1,42012.08.4647

430100100100100100

--

10010010010010099989492

2362.6.4

133

8401256

--

111822242526232726


121

Table 69. Statistical summary of selected water-quality properties for L'Anguille River near Colt. Ark.. 07047942

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, BTM=bottom material, mm=millimeter, fd=fall diameter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter), pesticides in bottom material (total in micrograms per kilogram), and sediment particle-size distribution (percent). Alkalinity and hardness are reported as CaCO.~, sulfate is reported as SOj., silica is reported as SiCL, and the phosphorus and nitrogen species are reported as P and N]


nitrogenTotal nitrite + nitrateTotal ammoniaBODFecal coliforms(3l625)Fecal strep. (31673)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZinc

N1981591621645550505050505052525228251009840

99in96776419131313139131313

25th Min- per- imum centile Median0.02.16.4511517

4.41.5.7.0.4

< 5.01.9

< .16.263.07.46.30

< .10< .01

1.235

8.21

< 20< 20< 20< 21,100

130< 20

1564.77.21034551

12.84.76.4.4

2.59.67.2.1

9.6111.18

1.20.83

.20

.102.583152292

< 20< 20< 20

51,40031020

4205.97.41767075

19.06.69.5.5

3.315.011.5

.211.5139.23

1.601.10

.30

.153.2200370843

< 20< 20< 20

81,70049030

75th per-

Mean centile7036.57.4230100102

25.39.412.4

.53.715.613.1

.213.6167.28

1.661.10

.37

.213.5----853

----__10

4,20059040

9638.17.7329167153

37.315.019.3

.74.7

21.718.0

.320.0212.34

2.001.38

.46

.214.0430862140

4< 20< 20< 20

134,500

90060

Max imum

6,14013.18.3638260260

62.026.034.0

19.6

29.032.01.0

24.03681.104.702.20

3.602.1012.0

620,000580,000

1907

< 20203323

23,0001,200

80


8442.4.4

1517369

16.46.88.2.2

1.97.47.3.1

5.584.16.71.40

.39

.321.7 602 6

6,00036022

122

Table 69. Statistical summary of selected water-quality properties forL'Anguille River near Colt, Ark., 07047942--Continued

PropertyAldrinAldrin in BTMChlordaneChlordane in BTMDDDDDD in BTMDDEDDE in BTMDOTDDT in BTMDiazinonDiazinon in BTMDieldrinDieldrin in BTMEn do su If anEndosulfan in BTMEndrinEndrin in BTMEthionEthion in BTMHeptachlorHeptachlor in BTMHeptachlor epoxideHeptachlor epoxide in BTMLindaneLindane in BTMMalathionMala th ion in BTMMethoxychlorMethoxychlor in BTMMethyl parathionMethyl parathion in BTMMethyl trithionMethyl trithion in BTMMirexMirex in BTMParathionParathion in BTMPerthaneSilvexToxapheneToxaphene in BTMTrithionTrithion in BTM2,4-D2,4,5-T

N171017101710171017101571710901510157171017101710157126157157

1101575181791571818


<<<<<<<

<

<<<

<

<<<<<<<<<<<<<<<<<<<

<<<<

<<<<

0.01 <.1 <.1 <

1.0 <.01 <.1.01 <

3.2.01

1.0.01 .1 <.01 <.3.01 < .01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <

.01 <

.1 <

.1 <

.01 << 1<10.01 <.1 <.01 <.01

( 0.01 <( .1< .1 <( 1.0 << .01 <5.6

( .01 <6.4

( .01 <3.5

( .01 <( .1 <( .012.4

( .01 <--

( .01 <( .1( .01 <( .1 <( .01 <( .1 <( .01 <( .1 <( .01 <C .1 <C .01 <C .1 <C .01 <C .1 <C .01 <C .1 <C .01 <C .1 <C .01 <

--

: .01 <: .1 <: .1 <: .01 <

< 1<10

: .01 <: .1 <: .01

.02

C 0.01.6

c .1( 1.0( .01

17C .01

16( .015.6

( .01( .1

.013.8

C .01

( .01.4

C .01C .1C .01C .1C .01C .1C .01C .1C .01C .1C .01C .1C .01c .1: .01c .1: .01

C .01: .1: .1: .01

< 1<10

: .01: .1

.04

.05

75th per-

Mean centile <

0.8

17 <18

<19

.014.1

<.4

<

.

0.01

0.130.32

C 0.011.6

C .1( 1.0( .01

31C .01

34C .01

22C .01( .1

.016.2

C .01--

C .01.6

C .01C .1C .01C .1C .01( .1( .01C .1C .01C .1: .01

.2C .01: .1C .01: .1C .01

-_: .01: .1: .1

.01< 122

: .01: .1

.18

.34

Max imum

< 0.012.1

< .123.0135

< .0139.01

110.01

< .1.02

8.7< .01

--< .01

1.0< .01< .1< .01< .1< .01

.3< .01

.2< .01< .1< .01

.7

.25< .1< .01< .1< .01

--.01

< .1< .1

.03< 145

< .01< .1

.592.8


--0.8 --12 13--33 .002.6------.3 -- ------------ ----------_-.01---- __.18.67

123

Table 69. Statistical summary of selected water-quality properties forL'Anguille River near Colt, Ark.

Property N



75th per-

Mean centile

Stan dard




1 mm (fd)0.5 mm (fd)0.25 mm (fd)0.1250.0620.062

mm (fd)mm (fd)mm (sd)

77626262626115

201009690878366

8910010098979679

14110010099989890

17610010098979687

19410010099999995

97510010010010010098

1540123410



16 mm8 mm4 mm2 mm1 mm

(sd)(sd)(sd)(sd,fd)(sd,fd)

0.5 mm (fd)0.250.1250.062

mm (fd)mm (fd)mm (fd)

616161616162616161

1005243403827222019

10010010010010099989796

10010010010010099999898

1009998989796959392

10010010010010099999999

100100100100100100100100100

069

101112131617


124

Table 70. Statistical summary of selected water-quality properties for L'Anguille River near Colt. Ark.. 07047942 (June through September)

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= strep tococci, BTM=bottom material, mm=millimeter, fd=fall diameter, sd=sieve dia meter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter), pesticides in bottom material (total in micrograms per kilogram), and sediment particle-size distribution (percent). Alkalinity and hardness are reported as CaCCL, sulfate is reported as SO^, silica is reported as Si00 , and the phosphorus and nitrogen species are reported as P and N]

Property N

25thMin- per- imum centile Median Mean

Stan-75th dardper- Max- devi-

centile imum ation

Discharge* Dissolved oxygen PHSpecific conductance Total alkalinity Total hardness Dissolved calcium Dissolved magnesium Dissolved sodium Sodium adsorption ratio Dissolved potassium Dissolved sulfate Dissolved chloride Dissolved fluoride Dissolved silica Dissolved solids Total phosphorus Total nitrogen Total organic

nitrogenTotal nitrite + nitrate Total ammonia BODFecal coliforms(3l625) Fecal strep.(31673) Turbidity Arsenic Cadmium Chromium Copper Lead IronManganese Zinc

645350521413131313131314141465

303012

6.42.16.91106476

19.06.9.7.0

2.45.09.6.2

11.0143.07.62.61

3012292319422220222

< .10< .01

1.4221108.2

4< 20< 20< 20

1,40049040

1524.27.5251108115

27.511.012.0

.62.814.015.0

.214.8181.16

1.28.73

.20

.082.8130370144

: 20 : 20 : 20

2164.87.7369173160

38.016.020.0

.73.1

20.518.0

.321.0244.21

1.701.05

.36

.153.4230720405

2020

1,40049040

< 20

2,70070045

4814.77.7354168166

40.515.917.9

.63.219.217.8

.319.3253.23

1.651.08

4745.37.9462218220

56.519.522.5

.83.4

26.020.5

.323.3330.27

2.001.45

.40

.143.4 43

5

.49

.193.8440

1,20075

6< 20< 20< 20

6,1406.08.2638260260

62.026.030.0

.84.7

28.026.0

.524.0368.49

3.701.60

.99

.227.2

1,5002,400

846

< 20 < 20 < 20

2,700 4,000700 90045 50

4,00090050

865.9.3

1356161

14.66.07.9.2.6

8.24.0.1

5.084.10.62.35

.25

.06 1.2

321

1,800290

7

125

Table 70. Statistical summary of selected water-quality properties forL'Anguille River near Colt, Ark., 07047942 (June through September) Continuec

Property

AldrinAldrin in BTMChlordaneChlordane in BTMDDDDDD in BTMDDEDDE in BTMDDTDDT in BTMDiazinonDiazinon in BTMDieldrinDieldrin in BTMEndosulfanEndosulfan in BTMEndrinEndrin in BTMEthionEthion.BTMHeptachlorHeptachlor in BTMHeptachlor epoxideHeptachlor epoxide in BTMLindaneLindane in BTMMalathionMa lath ion in BTMMethoxychlorMethoxychlor in BTMMethyl parathionMethyl parathion in BTMMethyl trithionMethyl trithion in BTMMi rexMirex in BTMParathionParathion in BTMPerthaneSilvexToxapheneToxaphene in BTMTrithionTrithion in BTM2,4-D2,4,5-T

N

6363636363526330635263636352415252405216625266

Min imum

< .01.3

< .1<1.0

< .0118

< .0115

< .015.3

< .01< .1< .01

4.1< .01

< .01< .1

< .01< .1< .01< .1

< .01< .1

< .01< .1

< .01< .1< .01< .1

< .01< .1< .01< .1< .01

< .01< .1< .1

< .01< 1

< 10< .01< .1< .01

.11

25th per-

centile

< .01.3

< .1<1 .0

< .0118

< .0115

< .015.3

< .01< .1

.014.1

< .01__

< .01< .1

< .01< .1< .01< .1

< .01< .1

< .01< .1

< .01< .1< .01< .1

< .01< .1< .01< .1< .01

--

< .01< .1< .1

< .01< 1

< 10< .01< .1< .01

.24

Median

< .01.7

< .1<1 .0

< .0130

< .0119

< .015.8

< .01< .1

.015.7

< .01--

< .01.6

< .01< .1< .01< .1

< .01< .1

< .01< .1

< .01< .1< .01< .1.03

< .1< .01< .1< .01

--< .01< .1< .1.01< 122

< .01< .1

.21

.53

Mean

.8 ----27__23__11 -_.015.8 --_- -- -- -- .06 ---------_.01-- __.25.87

75th per-

centile

< .011.4< .1<1 .0

< .0133

< .0136

< .0122

< .01< .1

.017.7

< .01

< .01.6

< .01< .1< .01< .1

< .01< .1

< .01< .1

< .01< .1< .01< .1.14

< .1< .01< .1< .01

< .01< .1< .1.02< 145

< .01< .1

.501.4

Stan dard

Max- devi- imum ation

< .011.4< .1<1 .0.0133

< .0136.0122

< .01< .1

.027.7

< .01--

< .01.6

< .01< .1< .01< .1

< .01< .1

< .01< .1

< .01< .1< .01< .1.25

< .1< .01< .1< .01

--< .01< .1< .1.03< 145

< .01< .1

.592.8

.6

7.9 11

9.5 .001.8 .10

.01

.24

.99

126

Table 70. Statistical summary of selected water-quality properties for L'Anguille River near Colt. Ark., 07047942 (June through September) Continued

___

25th 75th dardMin- per- per- Max- devi-

Property N imum centile Median Mean centile imum ation



10.0.0.0.0.

mm (fd)5 (fd)25 (fd)125 mm (fd)062 mm (fd)062 mm (sd)

2321212121212

431009790888394

11710010097969494

18010010099989896

25910010098979696

280100100100999998

97510010010010010098

229012343



1684210.0.0.0.

mm (sd)mm (sd)mm (sd)mm (sd,fd)mm (sd,fd)5 mm (fd)25 mm (fd)125 mm (fd)062 mm (fd)

212121212121212121

1001001001009997959493

10010010010010099999897

10010010010010099999999

10010010010010099999898

10010010010010099999999

10010010010010010010010099

000001112


127

Table 71. Statistical summary of selected water-quality properties for L'Anguille River near Palestine. Ark.. 07047950


Property




N

55555555

4643434343432

414141414141414141


02.66.680

471009892878079

10048383635343375

2134.97.194

7910010097949379

1001001001009893846357

Median

4765.97.3159

11410010098979689

10010010010010097938983

75th per-

Mean centile

6206.57.4223

13310010098969489

1009998979692857875

1,0107.87.7355

16510010099989898

10010010010010099989491

Stand ard


2,04012.18.1620

35710010010010010098

100100100100100100999897

5732.2.4

158

770023413

08

11121314172222


128

Table 72. Statistical summary of selected water-quality properties for L'Anguille River at Marianna. Ark. t 07047964

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hard ness are reported as CaCO~, sulfate is reported as SOn, and the phosphorus and nitrogen species are reported as P and N]



N0

12812865225910

1201228411367

941241151855601148212062616410653535453545416545423

Min imum

2.46.4592325

3.02.02.5102.07

< .05

< .10.52

3320

< 10< 20< 20< 20< 2080

< 27< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th per-

centile

5.77.0983252

8.28.07.5156.20.17

.102.25213440

< 10< 20< 20< 20< 202,400

140< 20

< .002< .002< .004< .002< .002

ND< .05< .04

< 2ND

Median

6.67.31739574

12.512.011.5189.27.30

.142.813018470

< 10< 20< 20< 20< 20

4,90027020

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean

7.07.323292100

13.614.713.2208.33.33

.243.1

100

5,20048038

75th per-

centile

8.27.6329133144

17.319.717.6241.37.43

.213.4370538110

< 10< 20< 20< 20< 20

7,30055030

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

12.88.1654230310

34.0100.046.0382

3.501.30

3.407.5

42,0009,3001,000

56< 20

305066

20,0004,900

515< .002

.004

.010

.010

.003ND

< .05.14< 2ND


2.1.4

1545764

8.911.07.468.34.23

.461.3 140

3,80070079


129

Table 73. Statistical summary of selected water-quality properties for L'Anguille River at Marianna, Ark., 07047964 (June through September)

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbid ity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness are reported as CaCCL, sulfate is reported as SCL, and the phosphorus and nitro gen species are reported as P and N]



N4

4546227

16144643283723

3444408

20164130412319213631313231323210323213

Min imum4023.96.8618244

10.04.04.0129.07

< .05

< .101.0

43325

< 10< 20< 20< 20< 20

80< 27< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th per-

centile4485.17.2212130113

11.08.012.0175.19.18

< .102.2649735

< 10< 20< 20< 20< 201,400245

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median9945.97.6336142147

15.014.018.0203.25.33

.112.815016648

< 10< 20< 20< 20< 20

2,50043020

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean1,2705.87.5339145153

18.514.318.2226.35.37

.223.1 75

3,50045035

75th per-

centile2,360

6.47.8439153194

29.519.222.0273.34.51

.183.448849772

< 10< 20< 20< 20< 20

3,60056028

< .002< .002< .004< .006< .002ND

< .05< .04

< 2ND

Max imum

2,6807.78.1654230310

34.028.046.0382

3.50.80

3.407.5

4,6003,000

26015

< 20< 20

2066

11,0001,300460

< .002.004.010.010.003ND

< .05.090< 2ND


1.0.3

1594462

10.66.58.474.55.21

.571.5 63

3,20027089

.003


130

Table 74. Statistical summary of selected water-quality properties for St. Francis River north of Helena, Ark.. 07047968

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hard ness are reported as CaCCL, sulfate is reported as SOj., and the phosphorus and nitrogen species are reported as P and N]


nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (31679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDDTDieldrinEndrinLindaneMala th ionMethyl parathionToxaphene2,4-D

N0

1021027321469

9495609143

73101901833468057844150538246464746474616474725

Min imum

3.06.3721922

4.0< 1.0

3.5101.03

< .05

< .10.323

4.0< 10< 20< 20< 20< 2026032

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th per-

centile

6.67.31636683

6.510.06.5169.14.13

< .102.4183035

< 10< 20< 20< 20< 201,800

100< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Med ian

7.97.628098129

12.013.08.0199.19.30

.113.259

42750

< 10< 20< 20< 20< 20

4,00017020

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean

8.07.6264110128

12.013.48.3205.27.38

.143.3 98

4,90021054

75th per-

centile

9.57.8342166161

16.516.09.5235.34.51

.173.9145

1,775160

< 10< 20< 20< 20< 20

6,80028040

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

12.68.272122138824.026.016.0431

2.601.50

.9610.0

4,5006,000

35030

< 20305043

26,000880930.010

< .002.010.010.050ND

< .05.05

< 2ND


2.1.3

1235866

6.55.22.557.29.34

.131.4 96

4,400160150 __


131

Table 75. Statistical summary of selected water-quality properties for St. Francis River north of Helena, Ark.. 07047968 (June through September)

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= strep tococci, ND=not detected. Units are milligrams per liter (mg/L) except dis charge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness are reported as CaCO~, sulfate is reported as SOn, and the phosphorus and nitrogen species are reported as P and N]

Property

Discharge* Dissolved oxygen PH Specific conductance Total alkalinity Total hardness Dissolved magnesiumDissolved sulfateDissolved chlorideDissolved solidsTotal phosphorusTotal nitrite +

nitrateTotal ammoniaBODFecal coliforms( 31616)Fecal strep. (31679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDOTDieldrinEndr inLindaneMa lath ionMethyl parathionToxaphene2,4-D

N

0 38 39 26 7 13 4

39 <36213116

28 <3935814132922281414162829 <29 <29 <29 <29 <2910 <29 <2913


3.0 5.7 7.2 7.5 102 211 66 150 84 96

10.0 10.51.0 10.05.0 7.6103 160.03 .15.07 .15

.10 < .10.3 3.22 20

20 204.0 29

< 10 < 10< 20 < 20< 20 < 20< 20 < 20< 20 < 20260 1,10032 160

< 20 < 20.002 < .002.002 < .002.004 < .002.002 < .002.002 < .002ND ND.05 < .05.04 < .04< 2 < 2

ND ND

6.9 7.7 321 171 140

12.013.09.0194.19.23

< .103.8845838

< 10< 20< 20< 20< 20

2,800 5240

< 20< .002< .002< .002< .002< .002ND

< .05< .04

< 2ND

Mean

6.7 7.7 310 161 145

14.513.09.2204.31.38

.114.1 57 --

,600280102 -- ----

75th per- Max- centile imum

7.8 7.9 370 180 166

21.016.011.0253.30.50

.154.5230

1,85866

< 10< 20< 20< 20< 20

7,80034038

< .002< .002< .002< .002< .002ND

< .05< .04

< 2ND

10.0 8.2 517 221 300

24.024.016.0310

2.601.20

.4410.0

4,5006,000

25030

< 20< 20

3030

26,000640930

< .002< .002

.010

.010

.050ND

< .05.04

< 2ND


1.7 .3

101 48 56 6.44.72.458.45.35

.091.6 59 --

7,200170249

includes only discharges corresponding to a water-quality sample.

132

Table 76. Statistical summary of selected water-quality properties for White River at Oil Trough. Ark.. 07061105

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (micro- Siemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness are reported as CaCO~, sulfate is reported as SO^, and the phosphorus and nitrogen species are reported as P and N]



N0

1161195920598

1101147711263

92115116

95445867789563133752020202020204

20209

Min imum

6.47.516511063

10.0< 1.0

2.5133

< .01.07

< .10.4212

2.5< 10< 20< 20< 20< 20< 30< 27< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th per-

centile

9.28.0255129130

11.24.04.5150.02.18

< .101.21617

3.9< 10< 20< 20< 20< 20

16052

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median

9.88.1279136140

13.06.05.5160.03.27

< .102.149326.0

< 10< 20< 20< 20< 2024073

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean

10.18.1278137140

12.96.45.6161.05.28

2.2 18 .

4909716

75th per

cent ile

11.48.2295150150

13.78.06.5171.06.35

< .102.92138515

< 10< 20< 20< 20< 2052010020

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

13.88.4523160190

17.025.013.0197.64.57

.227.0

13,00022012012

< 2093

860< 202,100

63060

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Stan dard devi ation 1.5.2451324

2.13.11.615

.07

.12

1.2 28 _-

56011013 -- .


133

Table 77. Statistical summary of selected water-quality properties for Black River near Corning, Ark.. 07064000

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, NDmot detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (micro- Siemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinityand hardness are reported as CaCCL, sulfate is reported phosphorus and nitrogen species are reported as P and N]

as SO, and the

Property NDischarge* 104Dissolved oxygenPHSpecific conductanceTotal alkalinityTotal hardnessDissolved magnesiumDissolved sulfateDissolved chlorideDissolved solidsTotal phosphorusTotal nitrite +

nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (31679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDDTDieldrinEndrinLindaneMa lath ionMethyl parathionToxaphene2.4-D

96946019499

85 <915790 <43 <

70 <98921535477757774240437418 <18 <18 <18 <18 <1810 <17 <1714


10.01.02.597.01.05

.10.1213

7.0< 10< 20< 20< 20< 20

7036

< 20.002.002.004.002.002ND.05.04< 2

ND

5927.57.61688685

11.56.04.5121.06.12

< .101.5273020

< 10< 20< 20< 20< 20940110

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median1,1208.67.9234107116

14.08.05.0142.09.16

< .102.1568025

< 10< 20< 20< 20< 201,300

180< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean1,9708.87.8220108113

14.38.05.3138.11.19

2.2 30

1,400180 __

75th per-

centile2,27010.08.0267139139

16.59.06.0152.13.25

< .102.616529040

< 10< 20< 20< 20< 20

2,000230

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

19,30012.38.3313156200

22.019.012.0247.68.66

.625.2

3,40018,000

8520

< 20205225

3,300390240

< .002< .002< .004< .002

.002ND

< .05< .04

< 2ND


1.7.3572934

3.73.41.426.09.12

1.0 17

75087


134

Table 78. Statistical summary of selected water-quality properties for Current River near Pocahontas, Ark., 07068850

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hard ness are reported as CaCO~, sulfate is reported as SOn, and the phosphorus and nitrogen species are reported as P and N]


nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (31679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDDTDieldrinEndrinLindaneMa lath ionMethyl parathionToxaphene2,4-D

N961201226120618

1091187912065

95120120145746868084612930781919191919199

191913

Min imum1,0606.67.1268530

14.0< 1.0

1.5114

< .01.07

< .10.428

2.0< 10< 20< 20< 20< 2016028

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th percentile

1,5108.47.9229124127

15.52.03.5149.02.17

< .101.1819

3.6< 10< 20< 20< 20< 2023050

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median2,400

9.28.0290144150

17.54.04.0166.04.25

< .101.52047

6.0< 10< 20< 20< 20< 2036077

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean3,310

9.58.0269142146

18.44.14.2163.06.25

--1.7 19--____----

48012020 __ -- --

75th per cent ile

3,84010.48.2314163177

20.55.05.0178.07.33

< .102.29914510

< 10< 20< 20< 20< 2057011026

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

15,60014.78.3364180230

26.019.09.0267.33.50

.784.6

9,100230280

< 10< 20

2411095

1,600970140

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND


1.4.2642735

3.82.81.224.06.10

«_.9 41---___

37017024 --

includes only discharges corresponding to a water-quality sample,

135

Table 79. Statistical summary of selected water-quality properties for Black River at Pocahontas, Ark.. 07069000

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (micro- Siemens per centimeter at 25 "Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness are reported as CaCO~, sulfate is reported as SO^, and the phosphorus and nitrogen species are reported as P and N]

PropertyDischarge*Dissolved oxygenpHSpecific conductanceTotal alkalinityTotal hardnessDissolved magnesiumDissolved sulfateDissolved chlorideDissolved solidsTotal phosphorusTotal nitrite +

nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (31679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDOTDieldrinEndrinLindaneMala th ionMethyl parathionToxaphene2,4-D

N6088922912520

8193808964

8686870

5732756574441719681111111111114

11119

Min imum1,4006.47.41297656

< 1.02.0111

< .01.06

< .10.12

2.3< 10< 20< 20< 20< 2019070

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th percentile

2,0207.87.7207103102

3.03.5136.04.17

< .101.420 15

< 10< 20< 20< 20< 2038089

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median4,420

8.77.9258135138

5.04.5157.06.22

< .102.044 20

< 10< 20< 20< 20< 20750130

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

75th per-

Mean centile6,090

9.07.9250133135

5.24.6155.07.23

.052.1 25 ----

1,10016020--------------

9,09010.08.1301168164

6.55.5176.09.28

< .102.6170 32

< 10< 20< 20< 20< 201,000

19029

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

21,50013.78.9339170390

20.016.0218.26.46

.234.9

2,100 9013

< 20< 20

35036

5,80041094

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND


1.6.3573250

2.91.923.05.09

.031.1 17------ --

1,5009419--------------------


136

Table 80. Statistical summary of selected water-quality properties for Black River at Pocahontas. Ark.. 07069000 (June through September)

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbid ity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness are reported as CaCCL, sulfate is reported as SOn, and the phosphorus and nitro gen species are reported as P and N]

Property

Discharge*Dissolved oxygenPHSpecific conductanceTotal alkalinityTotal hardnessDissolved magnesiumDissolved sulfateDissolved chlorideDissolved solidsTotal phosphorusTotal nitrite +

nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (31679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDOTDieldrinEndrinLindaneMa lath ionMethyl parathionToxaphene2,4-D

N

33333493

160

2733293123

3029300

22102621251645

225555552554


1,3806.97.623412056

< 1.02.5124

< .01.06

< .10.62

2.3< 10< 20< 20< 20< 2041070

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

1,9307.77.9260120122

3.04.0152.05.17

< .101.424 20

< 10< 20< 20< 20< 2044078

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median

2,9007.98.0294170140

4.05.0165.06.22

< .102.056 25

< 10< 20< 20< 20< 20700130

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean

3,2408.08.0288153133

4.85.2163.06.23

.042.1 26

1,900160

75th per-

centile

3,9108.58.1313170150

6.05.5176.07.28

< .102.6133 35

< 10< 20< 20< 20< 20

4,600240

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

9,2009.48.9338170170

20.016.0188.12.43

.104.8

1,100 5011

< 20< 20

3036

5,80033094

< .002< .002< .004< .002< .002ND

< .05.01< 2

ND


1,8100.60.2342928

3.92.615

.02

.09

.031.0 12

2,600100


137

Table 81. Statistical summary of selected water-quality properties for Black River at Black Rock, Ark. t 07072500

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, BTM=bottom material, ND=not detected, mm=millimeter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), trace metals and pesticides (total or total recoverable in micrograms per liter), pesticides in bottom material (total in micrograms per kilogram), sediment particle-size distribution (percent). Alkalinity and hardness are reported as CaCCL, sulfate is reported as SCL, silica is reported as SiO? , and the phosphorus and nitrogen species are reported as P and N]

PropertyDischarge*Dissolved oxygenPHSpecific conductanceTotal alkalinityTotal hardnessDissolved calciumDissolved magnesiumDissolved sodiumDissolved potassiumDissolved sulfateSodium adsorption ratioDissolved chlorideDissolved fluorideDissolved silicaDissolved solidsTotal phosphorusTotal nitrogenTotal organic

nitrogenTotal nitrite + nitrateTotal ammoniaBODFecal coliforms(3l625)Fecal strep. (31673)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrin

N90828686474343434343434343432020838132

843577625317999979993

Min imum

2,2305.47.21687881

17.02.41.1.1

< 5.0.0

2.1< .1

6.3124

< .01.13.10

< .10< .01

.610

1.0< 1< 20< 20< 20< 223050

< 20< 0.01

25th per- centile4,050

7.67.7244112120

26.013.01.81.1

< 5.0.1

2.6< .1

7.2156.04.45.29

.20

.021.42262

3.6< 1< 20< 20< 20

237060

< 20< 0.01

Median6,860

8.68.0296148150

31.018.02.21.25.4.1

2.9.1

8.0169.05.62.43

.25

.051.75217013

1< 20< 20< 20

44907020

< 0.01

Mean9,530

8.97.9288143145

30.516.82.51.45.8.1

3.1.1

8.0169.06.75.61

.25

.061.9 13

1-- 4

70080


10.18.2334170180

36.021.02.41.56.7.1

3.3.1

8.8191.09.81.64

.30

.092.023091518

1< 20< 20< 20

58809530

< 0.01

Max imum

56,10013.88.7380200190

41.023.019.06.312.0

.97.5.2

9.9208.33

3.002.70

.53

.305.08,60019,000

541

< 20< 20< 20

71,900

15030

< 0.01


1.7.3553334

6.44.62.6.9

2.1.1.9.0

1.124.05.48.60

.08

.06.9 130 2

51031

138

Table 81. Statistical summary of selected water-quality properties forBlack River

PropertyAldrin in BTMChlordaneChlordane in BTMDDDDDD in BTMDDEDDE in BTMDDTDDT in BTMDiazinonDiazinon in BTMDieldrinDieldrin in BTMEndosulfanEndosulfan in BTMEndrinEndrin in BTMEthionEthion in BTMHeptachlorHeptachlor in BTMHeptachlor epoxideHeptachlor epoxide in BTMLindaneLindane in BTMMalathionMala th ion in BTMMethoxychlorMethoxychlor in BTMMethyl parathionMethyl parathion in BTMMethyl trithionMethyl trithion in BTMMirexMi rex in BTMParathionParathion in BTMPer thaneSilvexToxapheneToxaphene in BTMTrithionTrithion in BTM2,4-D2,4,5-TSuspended sediment


N333333333333320333333333333323333303323333333

11

at Black Rock,


<<<<

<

<<<<<<<

<<<<<<<<<<<<<<<<<<<

<<<<

<<<<

.1

.11.0.01.2.01.2.01.1.01.1.01.1.01 .01.1.01.1.01.1.01.1.01.1.01.1.01.1.01.1.01.1.01 .01.1.1.01< 1

< 10.01.1.01.01

1392

< .1< .1< 1.0< .01

.2< .01

.2< .01< .1< .01< .1< .01

.1< .01

--

< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01

--

< .01< .1< .1< .01

< 1<10

< .01< .1< .01< .01

1392

Ark. 7

Med ian<<

<

<

<<<<<

<

<<<<<<<<<<<<<

<<<<<

<<<<

<<<<

.

.1.

.

.

.

.

.

.

.

.

.

.

.-...................-09,,<<9

9

9

*

1392

11001301301101101101 01101101101101101101601101101-

011101

1100110101

07072500 Continued

75th per-

Mean centile < . <

2. <

0.4 <

0.4 < < < < < < . < < < < . < < < < < . < < <

1.<

< < < < _ < < < »*» x »

<<

< < < < .

1392

11001801801301101401-01101101101101101101101101101-

011101

1100110101

1392

Max imum

< .1< .12.0

< .01.8

< .01.8

< .01.3

< .01< .1< .01

.4< .01

--< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01

1.1< .01< .1< .01< .1< .01

_-

< .01< .1< .1< .01

< 1< 10

< .01< .1< .01< .01

1392

Stan dard devi ation --.3 .3 -- -- -- ------ --______ -- ______--

00

Includes only discharges corresponding to a 139

water-quality sample,

Table 82. Statistical summary of selected water-quality properties for Black River at Black Rock, Ark., 07072500 (June through September)

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, BTM=bottom material, ND=not detected, mm=millimeter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 millimeters), turbidity (nephelometric turbidity units), trace metals and pesticides (total or total recoverable in micrograms per liter) pesticides in bottom material (total in micrograms per kilogram), sediment particle-size distribution (percent). Alkalinity and hardness are reported as CaCO^, sulfate is reported as SO^, silica is reported as Si00 , and the phosphorus ana nitrogen species are reported as P and N]

Property

Discharge*Dissolved oxygenPHSpecific conductanceTotal alkalinityTotal hardnessDissolved calciumDissolved magnesiumDissolved sodiumSodium adsorption ratioDissolved potassiumDissolved sulfateDissolved chlorideDissolved fluorideDissolved silicaDissolved solidsTotal phosphorusTotal nitrogenTotal organic

nitrogenTotal nitrite + nitrateTotal ammoniaBODFecal coliforms(3l625)Fecal strep. (31673)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZinc

N

282829291615151515151515151577

26269

28112720196Q0000000

Min imum

2,3505.47.318510192

22.02.41.1.1.7

< 5.02.2

< .16.9124

< .01.27.18

.12< .01

.65

225.0 -- --

25th per-

centile

3,4707.07.7263123120

27.014.02.0.1

1.1< 5.0

2.6< .1

8.5133.04.46.34

.20

.021.3296011------ -- --

Median

4,7957.58.0308157150

32.018.02.2.1

1.3< 5.0

2.9.1

9.6158.05.66.47

.25

.051.56116014

Mean

6,0107.38.0298150147

31.616.63.3.1

1.75.53.2.1

9.0163.07.74.56

.25

.065.7 19

75th per-

centile

7,1607.88.2335172170

36.020.02.4

.11.76.13.3.1

9.7196.09.85.86

.30

.112.071048025

Max imum

16,0008.58.7364200190

40.023.019.0

.96.312.05.4.2

9.9204.33

1.601.10

.48

.16106.08,60019,000

54


3,700.7.3482931

5.25.14.4.2

1.42.91.0.031.130.06.37.33

.07

.0520.1 18

140

Table 82 . Statistical summary of selected water-quality properties for Black River at Black Rock. Ark.. 07072500 (June through September) Continued

___

dardMax- devi-

Property_____________N imum centile Median Mean centile imum at ion

25thMin- per- imum centile Median

75th per-

centile

Aldrin 0Aldrin in BTM 0Chlordane 0Chlordane in BTM 0DDD 0DDD in BTM 0DDE 0DDE in BTM 0DDT 0DDT in BTM 0Diazinon 0Diazinon in BTM 0Dieldrin 0Dieldrin in BTM 0EndosuIfan 0Endrin 0Endrin in BTM 0Ethion 0Ethion in BTM 0Heptachlor 0Heptachlor in BTM 0Heptachlor epoxide 0Lindane 0Malathion 0Malathion in BTM 0Methoxychlor 0 Methoxychlor in BTM 0Methyl parathion 0 Methyl parathion in BTM 0Methyl trithion 0 Methyl trithion in BTM 0Mirex 0Parathion 0Parathion in BTM 0Perthane 0Silvex 0Toxaphene 0Toxaphene in BTM 0Trithion 0Trithion in BTM 02,4-D 02,4,5-T 0Suspended sediment 0^Includes only discharges corresponding to a water-quality sample.

141

Table 83. Statistical summary of selected water-quality properties for Black River at Jacksonport, Ark.. 07074490

[Nmumber of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hard ness are reported as CaCO~, sulfate is reported as SCL, and the phosphorus and nitrogen species are reported as P and N]

PropertyDischarge* Dissolved oxygen PH Specific conductance Total alkalinity Total hardnessDissolved magnesiumDissolved sulfateDissolved chlorideDissolved solidsTotal phosphorusTotal nitrite +

nitrateTotal ammoniaBODFecal coliforms( 31616)Fecal strep. (3 1679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDDTDieldrinEndrinLindaneMalathionMethyl parathionToxaphene2,4-D

N0

92 93 56 18 446

8886529039

7089929

3043615063362931551515151515154151510

Min imum

6.7 7.6 188 98 92

13.0< 1.0

3.5132

< .01< .05

< .10.307

5.0< 10< 20< 20< 20< 20230

< 27< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th per

cent ile

8.2 7.9 246 131 130

15.23.04.5167.05.08

< .101.3101419

< 10< 20< 20< 20< 20

71091

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median

9.2 8.1 289155 164

17.54.05.5183.07.23

< .102.0207725

< 10< 20< 20< 20< 201,400

140< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean

9.5 8.1 293 154 158

19.24.85.8180.09.22

2.3 31

1,500160

75th per

cent ile

10.7 8.2 343 182 180

22.26.06.5193.11.31

< .102.613013535

< 10< 20< 20< 20< 201,800220

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

13.6 8.6 403 200 260

32.020.012.0211.36.52

.236.6

2,70035011021

< 20< 20

63030

4,80047080

< .002< .002< .004< .002< .002

ND< .005< .04

< 2ND


1.6 .2 56 29 33

6.63.11.618

.06

.14

1.3 22

1,00098


142

Table 84. Statistical summary of selected water-quality properties for Black River at Jacksonport. Ark. f 07074490 (June through September)

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness are reported as CaCCL, sulfate is reported as SCL, and the phosphorus and nitrogen species are reported as P and N]

Property


nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (31679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDDTDleldrinEndrinLindaneMala th ionMethyl parathlonToxaphene2,4-D

N

03837225132

3334203316

28333551215221823129

10226666662665


6.77.819313192

16.0< 1.0

4.0156.01

< .05

< .10.737

8.0< 10< 20< 20< 20< 20380

< 27< 20

< .002.002.004

< .002.002ND

< .05< .04

< 2ND

7.77.9281136128

16.02.05.0177.06.06

< .101.2121321

< 10< 20< 20< 20< 20770127

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median

8.38.1309165150

16.54.06.0185.08.14

< .102.3307725

< 10< 20< 20< 20< 201,500

180< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean

8.58.1309165146

16.54.06.4184.09.16

2.5 27

1,700171 ___- .

75th per-

centile

9.28.3343195172

17.06.07.0195.10.26

< .103.114022034

< 10< 20< 20< 20< 20

2,300212

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

12.48.6403200182

17.010.012.0208.36.34

.236.6

2,70035045

< 10< 20< 20

2630

3,80031045

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND


1.2.2493027.7

2.32.014

.07

.11

1.5

9.3

1,10077 . __


143

Table 85. Statistical summary of selected water-quality properties for White River at Newport, Ark.. 07074500

[N=number of observations, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.=streptococci, mm=millimeter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter), sediment particle-size distribution (percent). Alkalinity and hardness are reported as CaCCL, sulfate is reported as SOn, silica is reported as SiCL, and the phosphorus and nitrogen species are reported as P and N.]

PropertyMin-

N imum

25thpercent ile Median

75thper-

Mean cent ileMaximum

Standarddeviation


nitrogenTotal nitrite + nitrate Total ammonia Fecal coliforms(3l625) Fecal strep.(31673) Turbidity Arsenic Cadmium Chromium Copper Lead IronManganese Zinc

73606161615858595958606161615960593636

37375759561819191917181819

4,1707.07.41052849

14.03.4.9.0.3

< 5.0.7

< .12.778

< .01.45.15

< .10< .01

12

1.0< 1< 20< 20< 20< 2

8030

< 20

11,3008.28.0257120120

30.012.02.3.1

1.26.03.5

< .14.9142.03.65.40

18,1009.08.1282130140

34.014.02.7.1

1.47.54.2.1

5.5159.06.79.50

27,1009.38.1276132139

32.913.82.9.1

1.47.54.5

5.6155.06.84.57

28,60010.48.3307150160

36.016.03.3.1

1.58.75.0.1

6.3173.09

1.08.74

296,00014.08.4345170180

41.020.08.9.3

2.112.019.0

.28.0214.18

1.401.10

37,2001.5.2452824

4.93.31.3.0.3

1.92.5--1.126.04.25.23

.17

.012036

9.31

< 20< 20< 20

6470 70 30

.25

.02679016

1< 20< 20< 20

1076010040

2503

231

1186012043

.34

.0422043023

1< 20< 20< 20

171,100

15050

.41

.27,200,900160

2203013020

,40028090

.09

.05

280

66007422

144

Table 85. Statistical summary of selected water-quality properties forWhite River at Newport, Ark., 0707^500- -Continued

Property

AldrinDDEDDTDieldrinEndrinLindaneMalathionMethyl para th ionToxaphene2,4-DSuspended

concentrationfiner than 0.062 (sd)

N

0000000000

6060

Minimum

------------

1014

25thpercent ile Median

39 5968 80

75thper-

Mean cent ile

63 7377 87

Standard

Max- devi-imum at ion

__ ____ ________ ____ __ sediment

195 3899 15

*Includes only discharges corresponding to a water-quality sample

145

Table 86. Statistical summary of selected water-quality properties forWhite River at Newport. Ark.. 07074500 (June through September)

[N=number of observations, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.=streptococci, mm=millimeter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimer at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter), sediment particle-size distribution (percent). Alkalinity and hardness are reported as CaCO.~, sulfate is reported as SOn, silica is reported as SiCL, and the phosphorus and nitrogen species are reported as P and N]

Property

Discharge*Dissolved oxygenPHSpecific conductanceTotal alkalinityTotal hardnessDissolved calciumDissolved magnesiumDissolved sodiumSodium adsorption ratioDissolved potassiumDissolved sulfateDissolved chlorideDissolved fluorideDissolved silicaDissolved solidsTotal phosphorusTotal nitrogenTotal organic

nitrogenTotal nitrite +

nitrateTotal ammoniaFecal coliforms(3l625)Fecal strep. (31673)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZinc

N

27232323232222222222232323232223221414

14

1422232266665666

Min imum

4,8207.27.4254110120

30.09.72.0.1.3

< 5.03.0

< .13.5143.02.48.39

< .10

< .0112

4.5< 1< 20< 20< 20

45707020

25th percentile

10,7007.88.1269130138

34.812.82.5.1

1.36.03.9

< .15.0159.04.68.43

.10

.0126409.3

1< 20< 20< 20

76007828

Median

14,3008.28.2302147150

36.015.02.9.1

1.47.04.6.1

6.0171.06.79.51

.24

.01638911

1< 20< 20< 20

1389016055

Mean

16,3008.38.2297144150

35.515.03.3.1

1.47.05.5.1

5.9172.06.83.58

.22

.03 --16

1_-15--13

1,10017055

75th percentile

24,8008.68.3318152160

37.317.03.5.1

1.58.05.2.1

6.9185.08

1.00.72

.36

.03150140192

< 2023

< 2018

1,50028083

Max imum

31,6009.48.4345170180

40.019.08.9.3

2.112.019.0

.28.0214.14

1.20.99

.41

.181,9004,800

702

< 20307518

2,10028090


7,480.6.2271616

2.72.71.5.1.4

2.43.4.0

1.317

.03

.20

.19

.14

.05 --14

1--8 6

5909227

146

Table 86. Statistical summary of selected water-quality properties for WhiteRiver at Newport, Ark., 07074500 (June through September) Continued

Stan dard

Max- devi- Property______________N imum centile Median Mean centile imum ation

25thMin- per- imum centile Median

75th per-

Mean centile

Aldrin DDE DDTDieldrin Endrin Lindane Malathion Methyl parathion Toxaphene 2,4-DSuspended sediment

concentration

0000000000

23finer than 0.062 mm (sd) 23

2360

4369

5679

5877

6983

15793

2810


147

Table 87. Statistical summary of selected water-quality properties for White River near Augusta. Ark,. 07074850

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hard ness are reported as Ca(XL, sulfate is reported as SO^, and the phosphorus and nitrogen species are reported as P and N]


nitrateTotal ammoniaBODFecal coliforms( 31616)Fecal strep. (31679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDOTDieldrinEndrinLindaneMalathionMethyl parathionToxaphene2.4-D

N58991015918496

91 <925797 <43 <

73 <93961136466354683630336512 <12 <12 <12 <12 <124 <12 <129


866.07.01749649

11.01.03.0124.01.05

.10.325

5.4< 10< 20< 20< 20< 2021080

< 20.002.002.004.002.002ND.05.04< 2

ND

8,5708.57.9239128129

12.54.05.0153.04.16

< .101.3

72016

< 10< 20< 20< 20< 20

660100

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median14,700

9.48.1284144144

16.55.05.5167.06.22

< .101.92519025

< 10< 20< 20< 20< 2092015020

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean24,100

9.68.1272138143

16.75.35.9164.09.23

2.2 33

1,20016032

75th per-

c en tile26,000

10.68.2310150163

20.77.06.5179.10.30

< .102.578

31040

< 10< 20< 20< 20< 20

1,80021041

< .002< .002< .004< .002< .002

ND< .05< .04

< 2ND

Max imum

245,00013.28.535217022023.013.010.0195.74.47

.307.1

1,62546519018

< 2030

66070

3,300390140

< .002< .002< .004

.010< .002ND

< .05< .04

< 2ND


1.5.2452034

4.42.41.217

.09

.09

1.4 31

7307431


148

Table 88. Statistical summary of selected water-quality properties for White River near Augusta, Ark.. 07074850 (June through September)

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbid ity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness are reported as CaCO~, sulfate is reported as S0|., and the phosphorus and nitro gen species are reported as P and N]

Property


nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (3 1679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDDTDieldrinEndrinLindaneMalathionMethyl parathionToxaphene2,4-D

N

27353521513

13132183215

2629325

1112171519979183333331333


5,6606.07.617413149

17.0< 1.0

4.5143.01

< .05

< .10.72

209.5

< 10< 20< 20< 20< 20210120

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

10,2008.18.0287141140

17.03.05.5158.04.20

< .101.412

12515

< 10< 20< 20< 20< 20590130

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Med ian

13,8008.58.1303150144

17.04.06.0171.06.25

< .101.84231025

< 10< 20< 20< 20< 2090016026

< .002< .002< .004< .002< .002

ND< .05< .04

< 2ND

Mean

13,8008.58.1290151140

17.04.66.3170.07.22

2.1 29 16

93019033

75th per-

centile

16,5009.18.3317162155

17.06.07.0180.09.27

< .102.611039240

< 10< 20< 20

21< 201,20024045

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

25,00010.68.5336163184

17.09.08.5195.23.30

.304.7

1,6254656014

< 20< 20

4029

1,90030096

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND


5,2301.0.2451332-

2.01.014

.05

.07

1.0 16 11

5306527


149

Table 89. Statistical summary of selected water-quality properties for Little Red River at Judsonia. Ark. t 07076634

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 "Celsius), bacteria (colonies per 100 milliliters), turbid ity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness are reported as CaCO~, sulfate is reported as SO^,, and the phosphorus and nitro gen species are reported as P and N]


nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (31679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDDTDieldrinEndrinLindaneMa lath ionMethyl parathionToxaphene2.4-D

N0

1011026018496

92 <945799 <42

74 <95931136478055843649498112 <12 <1£ <13 <12 <124 <12 <129

Min imum

6.96.236912

1.01.02.5

6.01.05

.10.327

4.2< 10< 20< 20< 20< 2017030

< 20.002.002.004.002.002ND.0$.04< 2

ND

25th per-

centile

8.86.9471517

1.03.04.036.04.18

< .101.13540

7.9< 10< 20< 20< 20< 20

390140

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median

9.77.05117202.04.04.545.06.24

< .101.58813022

< 10< 20< 20< 20< 2069019030

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

75th per-

Mean centile

9.77.0531727

3.04.04.746.09.46

.101.7 23 26

1,10022036

10.57.2572128

6.05.05.054.10.45

.122.022024025

< 10< 20< 20

3030

1,00024043

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

13.67.888251306.011.09.0129.85

2.20

.447.4

2,4001,300

11011

< 202519070

6,0001,500

160< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND


1.3.3104

212.42.01.217

.10

.53

.07.9 18 36

1,10021028


150

Table 90. Statistical summary of selected water-quality properties for Little Red River at Judsonia, Ark., 07076634 (June through September)

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.=streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness are reported as CaCO~, sulfate is reported as SOn, and the phosphorus and nitrogen species are reported as P and N]



N0

3535215

132

3132183215

2629315

1113251626101315254444442444

Min imum

6.96.2391616

1.0< 1.0

2.56

.01

.05

< .10.72

4015

< 10< 20< 20< 20< 2026030

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th per-

centile

8.36.9481618

1.01.04.035.04.14

< .101.2525220

< 10< 20< 20< 20< 20500170

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median--9.07.15117202.03.04.044.06.21

< .101.511013025

< 10< 20< 20< 20< 2068022030

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean

9.07.0521824

2.03.14.344.07.21

.091.6 24 23

1,10021039

75th per-

centile

9.77.3562028

3.04.04.547.08.25

.121.921031525

< 10< 20< 20

30< 201,10027046

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

10.57.5662167

3.08.08.0129.20.44

.283.447039030

< 10< 20< 20

11070

4,600470140

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Stan dard devi ation .9.37213

1.41.7.924.04.09

.07.7

4.5 25

1,20011033


151

Table 91. Statistical summary of selected water-quality properties for White River at DeValls Bluff, Ark. t 07077000

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbid ity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness are reported as Ca(XL, sulfate is reported as SOj., and the phosphorus and nitro gen species are reported as P and N]

PropertyDischarge*Dissolved oxygenPHSpecific conductanceTotal alkalinityTotal hardnessDissolved magnesiumSodium adsorption

ratioDissolved sulfateDissolved chlorideDissolved solidsTotal phosphorusTotal nitrite +


N92129129662360125

1201228811371

98131119135550988294573638802929292929269

272814

Min imum

5,0905.27.21346311

8.0.1

< 1.02.5106

< .01< .05

< .10.6

12

6.8< 10< 20< 20< 20< 20190

< 27< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th percentile

9,7608.37.8206110106

12.2.1

4.05.0137.05.11

< .101.6101520

< 10< 20< 20< 20< 20

76083

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median16,200

9.38.0243120128

13.0.1

5.06.0147.07.20

< .102.1406725

< 10< 20< 20< 20< 201,200

110< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean24,100

9.48.0237121125

13.6.1

5.35.9149.09.22

.062.2----31 -_--

2,00020022


10.48.2269132142

14.7.1

6.07.0161.10.30

< .102.710014840

< 10< 20< 20< 20< 20

2,00017021

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

85,90013.18.6314160330

23.0.1

16.018.0198

1.10.71

.656.6

1,60060513013203012028

9,0001,100

180< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND


1.5.3422340

3.6.0

2.42.117

.11

.15

.08.9 --19 -_-_

2,20025037 ----

^Includes only discharges corresponding to 152

a water-quality sample.

Table 92. Statistical summary of selected water-quality properties for White River at DeValls Bluff, Ark.. 07077000 (June through September)

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbid ity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness are reported as CaCO«, sulfate is reported as SOj., and the phosphorus and nitro gen species are reported as P and Nl


nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (31679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDOTDieldrinEndrinLindaneMalathionMethyl para th ionToxaphene2,4-D

N4549502611208

4946334128

3951414

2018363136241516311414141414114

13145

Min imum

5,8205.27.21769096

10.0< 1.0

3.4106

< .01< .05

< .10.621010

< 10< 20< 20< 20< 2022054

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th percentile

9,2707.97.9244115130

13.03.05.0141.06.05

< .101.8102420

< 10< 20< 20< 20< 20410102

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median15,000

8.38.1261120137

13.55.06.0149.07.15

< .102.4647625

< 10< 20< 20< 20< 20

1,200140

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2.01

Mean17,200

8.38.0255125147

13.45.26.3150.09.18

--2.4-- 26 ------

2,80033025-_-_-_-_----------.02


8.98.2278139150

14.76.07.0162.10.29

< .103.016047530

< 10< 20< 20< 20< 20

3,90049030

< .002< .002< .004< .002< .002ND

< .05< .04

< 2.04

Max imum

58,00010.58.631415033015.016.018.0179.30.51

.654.3

1,2006055013

< 2030120200

9,0001,100

170< .002< .002< .004< .002< .002

.01< .05< .04

< 2.04


1.0.33418461.63.12.414

.06

.14

--.8----10--------_-

3,20034035-_-_____---_------.02


153

Table 93. Statistical summary of selected water-quality properties for Cache River near Cash, Ark., 07077400



nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (3 1679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDOTDieldrinEndrinLindaneMalathionMethyl parathionToxaphene2,4-D

N72100977521509

9392569043

7697901334538059955155588338383838383815373721

Min imum

.02.76.529168

1.9< 1.0

3.03

.01< .05

< .101.1

21025

< 10< 20< 20< 20< 2028037

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th per-

centile44

6.57.2862642

4.06.06.5184.22.11

< .102.5403760

< 10< 20< 20< 20< 202,400

17020

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median2007.87.51596363

5.09.09.0212.30.20

.153.594150100

< 10< 20< 20< 20< 20

4,80030040

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean6308.07.51948180

7.110.610.6223.36.31

.223.7

200 3021

6,50041056

75th per-

centile7729.97.9315140115

11.013.513.0258.43.37

.254.5232

1,375180

< 10< 20< 20

2822

8,30058070

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

7,50012.88.743620021013.051.030.04722.002.50

2.3010.0

4,6004,8001,000

242030

230275

39,0001,800460

< .002< .002< .004

.020

.002

.01< .05< .04

2ND

Stan dard devi ation1,1202.2.5

1196249

3.97.05.676.26.41

.301.7

250 4842

7,00035063


154

Table 94. Statistical summary of selected water-quality properties for Cache River near Cash, Ark., 07077400 (June through September)

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbid ity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness are reported as CaCO~, sulfate is reported as S(k, and the phosphorus and nitro gen species are reported as P and N]

PropertyDischarge*Dissolved oxygenpHSpecific conductanceTotal alkalinityTotal hardnessDissolved magnesiumDissolved sulfateDissolved chlorideDissolved solidsTotal phosphorusTotal nitrite +

nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (3 1679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDOTDieldrinEndrinLindaneMa lath ionMethyl parathionToxaphene2,4-D

N373735286

143

3433183015

27343551217292136161920342222222222228

222211


264.67.1793432

4.0< 1.0

4.5154.09

< .05

< .101.1162040

< 10< 20< 20< 20< 2028037

< 20< .002

.002

.004< .002

.002ND

< .05< .04

< 2ND

1356.17.41516682

4.05.08.0191.18.10

< .102.1603056

< 10< 20< 20< 20< 201,500230

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median2606.87.82991291069.07.012.0219.24.16

< .103.313015068

< 10< 20< 20< 20< 20

3,50032026

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean3936.87.82591251148.79.712.4221.26.27

.143.7 82 2933

5,20042053 __ -_

75th per-

centile4657.58.0338185150

13.012.016.3252.32.45

.195.22701925

94< 10< 20< 20

2826

5,40057073

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

2,22012.28.743620021013.051.025.0292.58.88

.5510.0

3,6003,100

21012

< 20< 20

169275

30,0001,600220

< .002< .002< .004

.020

.002ND

< .05< .04

< 2ND


4321.4.4

1156351

4.58.623.7

39.11.29

.152.1 47 4568

6,60036058 ____


155

Table 95. Statistical summary of selected water-quality properties for Cache River at Patterson, Ark., 07077500

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, BTM=bottom material, mm=millimeter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter), pesticides in bottom material (total in micrograms per kilogram), and sediment particle-size distribution (percent). Alka linity and hardness are reported as CaCCL, sulfate is reported as SCL, silica is reported as SiO? , and the phosphorus and nitrogen species are reported as P and N]


nitrogenTotal nitrite + nitrateTotal ammoniaBODFecal coliforms( 31625)Fecal strep. (31673)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZinc

N369099999998989999989999 <9999 <7571999741

99 <41 <96736228131313138131313


330.06.4447

153.71.42.8.3.4

5.01.7.1

2.741.12.40.11

.10

.01.8103

171

< 20< 20< 20

370070

< 20

3205.37.08422266.32.55.8.4

2.27.35.1.1

7.175.18

1.10.76

.17

.102.179

200362

< 20< 20< 20

31,000

160< 20

Median8306.97.31324043

10.53.78.8.6

2.910.07.3.1

11.0104.22

1.501.10

.33

.152.5130320942

< 20< 20< 20

52,200

31030

75th per-

Mean centile1,370

7.17.31696362

15.55.59.8.6

3.010.27.5.2

11.6114.26

1.591.17

.37

.162.7----130

3------10

3,10044050

1,2308.57.62409488

22.37.512.0

.73.713.09.5.2

15.0140.31

2.001.35

.50

.193.2250682220

4< 20< 20< 20

124,000

67040

Max imum

6,30013.68.2449205180

46.016.027.0

17.6

26.020.0

.428.0242.59

3.403.00

1.10.506.4

1,70014,000

3307

< 20302337

10,0001,300360


1085345

11.73.85.2.2

1.34.13.4.1

5.652.10.70.64

.23

.091.0 110

2 11

3,00039095

156

Table 95. Statistical summary of selected water-quality properties forCache River

PropertyAldrinAldrin in BTMChlordaneChlordane in BTMDDDDDD in BTMDDEDDE in BTMDDTDDT in BTMDiazinonDiazinon in BTMDieldrinDieldrin in BTMEndosulfanEn do su If an in BTMEndrinEndrin in BTMEthionEthion in BTMHeptachlorHeptachlor in BTMHeptachlor epoxideHeptachlor epoxide in BTMLindaneLindane in BTMMalathionMala th ion in BTMMethoxychlorMethoxychlor in BTMMethyl parathionMethyl parathion in BTMMethyl trithionMethyl trithion in BTMMirexMi rex in BTMParathionParathion in BTMPerthaneSilvexToxapheneToxaphene in BTMTrithionTrithion in BTM2,4-D2,4,5-TSuspended sediment con

centration finer than0.062 mm (sd)

N7757777777556740775577775755547555305526775566

1716

at Patter son, Ark., 07077500--Continued

25th 75th Min- per- per- imum centile Median Mean centile

<<<<<

<

<<<<<

<

<<<<<<<<<<<<<<<<<<<

<<<<

<<<

.01 <

.1 <

.1 <1.0 <.01 <.4.01 <.6.01 <.1.01 <.1 <.01 <.1.01 < .01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <

.01 <

.1 <

.1 <.01 << 1< 10.01 <.1 <.01 <.02

3070

: .01 <: .1 <: .1 <: 1.0 <: .01 <

1.0: .01 <

1.7: .01 <

.2c .01 <: .1 <: .01 <

.2: .01 <

--' .01 <: .1 <: .01 <: .1 <: .01 <: .1 <: .01 <: .1 <: .01 <: .1 <: .01 <: .1 <: .01 <: .1 <: .01 <: .1 <: .01 <: .1 <: .01 <

--: .01 <: .1 <: .1 <: .01 <

< 1<10

: .01 <: .1 <: .01

.02

6178

: .01 -- <c .1 <: .1 -- <C 1.0 <' .01 -- <2.2 5.7

c .01 <2.5 5.7

C .01 -- <4.1 4.9

: .01 -- <c .1 -- <C .01 <

.4 .8c .01 <

C .01 -- <: .1 .2: .01 -- <' .1 <C .01 -- <: .1 <C .01 <: .1 -- <c .01 -- <: .1 <: .01 <c .1 <C .01 <C .1 -- <: .01 -- <: .1 <: .01 <c .1 -- <: .01 -- <

: .01 -- <: .1 <: .1 <: .01

< 1<10

: .01 -- <: .1 -- <

.02 .02

.06 .06

88 10993 88

: .01' .1c .1C 1.0: .019.0

C .019.2

C .017.6

: .01c .1C .01

1.2: .01

--c .01

.3C .01C .1C .01; .1: .01: .1C .01C .1: .01' .1C .01C .1: .01c .1C .01: .1: .01

--: .01c .1' .1

.03< 1<10

: .01: .1

.05

.08

17097

Max imum

< .01.2

< .11.0

< .0119

< .0118

< .0117

< .01< .1< .012.7

< .01--

< .01.3

< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01

--

< .01< .1< .1

.08< 126

< .01< .1

.07

.10

22098


----------

6.6--

6.2--

6.1----__.9------.1-- ---------- ---- --------------------.03.03

6210

^Includes only discharges corresponding to a water-quality sample. 157

Table 96. Statistical summary of selected water-quality properties for Cache River at Patterson. Ark.. 07077500 (June through September)

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, BTM=bottom material, ND=not detected, mm=millimeter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 millimeters), turbidity (nephelometric turbidity units), trace metals and pesticides (total or total recoverable in micrograms per liter) pesticides in bottom material (total in micrograms per kilogram), sediment particle-size distribution (percent). Alkalinity and hardness are reported as CaCCL, sulfate is reported as SOj., silica is reported as Si00 , and the phosphorus ana nitrogen species are reported as P and N]


nitrogen *Total nitrite + nitrateTotal ammoniaBODFecal coliforms(3l625)Fecal strep. (31673)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZinc

N12283030303030303030303030302221303013

3013302118722220222

Min imum1991.56.8852025

6.12.45.0.4.8

< 5.03.4

< .17.367.12.40.11

.10< .01

1.11170294

< 20< 20< 20

__2,200

27030

25th per-

centile3524.67.41656160

15.05.59.0.6

2.47.95.8.2

12.0115.16

1.00.65

.22

.072.293

230344

< 20< 20< 20

--2,200

27030

Median6435.17.62078377

19.56.912.5

.62.710.08.1.2

15.0139.20

1.601.00

.50

.112.4180400586

< 20< 20< 20

6,100340195

Mean93**5.07.624710194

23.68.313.6

.62.810.68.0.2

15.3153.23

1.60.97

.50

.132.9----576 __

6,100340195

75th per- Max-

cent ile imum1,1605.77.8346146140

35.011.318.0

.73.212.39.8.2

19.0208.26

2.001.25

.69

.143.2315617767

< 203023

10,000400360

3,7706.58.1434205180

46.016.024.0

.94.5

26.013.0

.422.0229.50

3.401.80

1.10.506.4670

14,000100

7< 20

3023

10,000400360


9901.0.3

1045345

11.63.95.0

.1

.74.62.5.1

4.350.10.71.43

.27

.121.3 262

5,50092

233

158

Table 96. Statistical summary of selected water-quality properties for CacheRiver at Patterson, Ark., 07077500 (June through September) Continued

PropertyAldrinAldrin in BTMChlordaneChlordane in BTMDDDDDD in BTMDDEDDE in BTMDOTDDT in BTMDiazinonDiazinon in BTMDieldrinDieldrin in BTMEndosulfanEndosulfan in BTMEndrinEndrin in BTMEthionEthion in BTMHeptachlorHeptachlor in BTMHeptachlor epoxideHeptachlor epoxideLindaneLindane in BTMMala th ionMala th ion in BTMMethoxychlorMethoxychlor in BTMMethyl parathionMethyl parathion inMethyl trithionMethyl trithion inMi rexMirex in BTMParathionParathion in BTMPer thaneSilvexToxapheneToxaphene in BTMTrithionTrithion in BTM2,4-D2,4,5-TSuspended sediment

concentrationfiner than 0.062

N21112121211111102111212

in BTM 11111102

BTM 11

BTM 1001101211111

2mm (sd)2

Min imum

< .01< .1< .1<1 .0

< .011.0

< .012.1

< .014.9

< .01< .1< .01

.2< .01

< .01< .1

< .01< .1< .01< .1

< .01< .1

< .01< .1

< .01< .1< .01

< .01< .1< .01< .1

--

< .01< .1

< .01< 1<10

< .01< .1< .01

.08

6195

25th per-

centile< .01< .1< .1<1 .0

< .011.0

< .012.1

< .014.9

< .01< .1< .01

.2< .01

< .01< .1

< .01< .1< .01< .1

< .01< .1

< .01< .1

< .01< .1< .01

< .01< .1< .01< .1

< .01< .1

< .01< 1<10

< .01< .1< .01

.08

6195

Median Mean< .01< .1< .1<1.0

< .011.0 1.0

< .012.1 2.1

< .014.9 4.9

< .01< .1< .01

.2 .2< .01

< .01< .1

< .01< .1< .01< .1

< .01< .1

< .01< .1

< .01< .1< .01

< .01< .1< .01< .1

< .01< .1

__ __

< .01< 1<10

< .01< .1< .01

.08 .08

120 12095 95

75th per-

centile< .01< .1< .1< 1 .0

< .011.0

< .012.1

< .014.9

< .01< .1< .01

.2< .01

< .01< .1

< .01< .1< .01< .1

< .01< .1

< .01< .1

< .01< .1< .01

< .01< .1< .01< .1

__

< .01< .1

< .01< 1<10

< .01< .1< .01

.08

17995

Stan dard

Max- devi- imum at ion< .01< .1< .1< 1 .0

< .011.0

< .012.1

< .014.9

< .01< .1< .01

.2< .01

< .01< .1

< .01< .1< .01< .1

< .01< .1

< .01< .1

< .01< .1< .01

< .01< .1< .01< .1

----

< .01< .1

< .01< 1<10

< .01< .1< .01

.08

17995

.0 .0

.0 .0 -- -- __-- --

.00

830

"Includes only discharges corresponding to a water-quality sample,159

Table 97. Statistical summary of selected water-quality properties for Cache River at Brasfield. Ark.. 07077600

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hard ness are reported as CaCO~, sulfate is reported as SCk, and the phosphorus and nitrogen species are reported as P and N]

PropertyDischarge*Dissolved oxygenPHSpecific conductanceTotal alkalinityTotal hardnessDissolved magnesiumSodium adsorption



N0

107107772550125

98 <99659548 <

79 <107951632558562934357619046 <46 <46 <46 <46 <4320 <44 <4325


3.96.651516

1.0.5

1.03.597.02.05

.10.92

2010

< 10< 20< 20< 20< 20290

< 27< 20.002.002.004.002.002ND.05.04< 2

ND

5.67.0902941

7.0.6

4.07.5155.13.13

< .101.9207032

< 10< 20< 20< 20< 201,700

120< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median--

6.97.31425562

8.7.7

6.012.0182.20.22

.132.56729075

< 10< 20< 20< 20< 20

3,700210

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

75th per-

Mean centile

7.27.31676772

9.3.6

7.113.2185.22.28

.142.9 93 __

4,00031025 -_ __

8.67.6232110100

13.6.7

9.016.0210.31.37

.203.3230487150

< 10< 20< 20< 20< 20

5,70046030

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

12.78.1435164190

17.0.7

22.055.0302.45

1.20

.5112.0

3,9007,800

20015

< 2050108200

9,300980230

< .002.010.010.004.010ND

< .05.11< 2.04


2.10.4924339

4.7.1

4.28.543.10.22

.091.7 61 --

2,40026037-- -_


160

Table 98. Statistical summary of selected water-quality properties for Bayou DeView near Gibson, Ark.. 07077660

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hard ness are reported as CaCO~, sulfate is reported as SCL, and the phosphorus and nitrogen species are reported as P and N]



N581161155919608

1101127610664

93110106

75546103761195757601023030303030308

303011

Min imum

.0

.76.4511513

2.4< 1.0

2.581.08

< .05

< .101.0

210

6.4< 10< 20< 20< 20< 20650

< 27< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th per-

centile5.25.77.11173439

3.211.710.0149.48.34

< .103.1862020

< 10< 20< 20< 20< 202,400

25020

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median17

8.57.419068555.016.017.0202.97.68

.184.939510045

< 10< 20< 20< 20< 20

3,60036030

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean83

8.07.52367575

6.419.220.82101.60.94

1.659.1 67 25

4,70048051

75th per-

centile58

10.27.835210794

8.722.328.8254

2.001.08

.659.0

2,07518080

< 10< 20< 20

20< 20

6,00068060

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum1,90015.38.857815058015.0

230.071.0375

10.004.10

37.00157.8

122,0008605503630

< 20250170

20,0001,500420

< .002< .002< .004

.010< .002

ND< .05< .04

< 2ND


2553.3.5

1464476

4.222.013.770

1.69.91

5.1717.5 85 43

3,70035067


161

Table 99. Statistical summary of selected water-quality properties for Bayou Deview near Gibson. Ark. t 07077660 (June through September)

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbid ity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness arereported as CaCO~, sulfate is reported as SOn, gen species are reported as P and N]

Property



N

304139215172

3939263422

3236363

201535274222171838191919191919419196


.0

.76.710010742

9.0< 1.0

5.5145.08

< .05

< .101.0

21406.4

< 10< 20< 20< 20< 2065086

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

3.14.17.415611975

9.013.017.0223.49.05

< .102.79214020

< 10< 20< 20< 20< 202,200

230< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

126.37.834314094

12.019.027.0249.97.62

.114.526018025

< 10< 20< 20< 20< 20

2,90044030

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

and the phosphorus and

75th per-

Mean centile

406.37.7324135130

12.020.926.92541.51.76

2.317.6 53 23

4,60061040

538.58.0438149130

15.028.036.0291

2.351.05

.9411.0

2,52586038

< 10< 20< 2022

< 207,4001,100

60< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

27612.38.857815058015.048.058.0375

4.703.10

37.0030.0

122,00086055036

< 20< 20

16690

11,0001,500

150< .002< .002< .004

.010< .002ND

< .05< .04

< 2ND

nitro-

Stan- dard devi ation

692.8.4

15418

1234.210.112.7

611.43.84

6.897.1 118 33

3,30045035

"Includes only discharges corresponding to a water-quality sample.

162

Table 100. Statistical summary of selected water-quality properties for Bayou DeView at Morton. Ark.. 07077700

[N=number of observations, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.=streptococci, BTM=bottom material, ND=not detected, mm=millimeter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conduct ance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), trace metals and pesticides (total or total recoverable in micrograms per liter) and pesticides in bottom material (total in micrograms per kilogram). Alka linity and hardness are reported as CaCO~, sulfate is reported as SOj.__ 1 _ _ _ _!__! __ ft S\ 1 t 1 Jl _ I_ _ __J _ *____ ___ ____ __ _ ^silica is reported reported as P and N]

as Si00 , and the phosphorus and nitrogen species are


nitrogenTotal nitrite + nitrateTotal ammoniaBODFecal coliforms(3l625)Fecal strep. (31673)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinAldrin in BTM

N368999999899999998989999 <9999 <7568999841

99 <41967460281213131381313135 <4 <

25th Min- per- imum centile0.01.66.2497

154.21.13.3.2.5

5.02.0.1

3.449.03.69.31

.10

.02.845172

< 20< 20< 20

4850160

< 20.01.1

834.47.0952630

7.62.76.6.5

2.39.05.8.1

6.684.18

1.28.83

.15

.083.053112352

< 20< 20< 20

51,20022020

< .01< .1

Median2606.17.21464344

11.03.99.4.6

3.113.08.7.2

9.8119.24

1.801.20

.30

.183.7130320932

< 20< 20< 20

61,80044030

< .01.2

Mean5586.47.31876668

17.55.810.7

.63.613.39.6.2

11.0129.27

1.861.25

.35

.233.9-_--120

2----__6

2,60048028__--

75th percentile

6028.47.62559195

24.08.214.0

.74.517.012.0

.214.0164.34

2.301.70

.47

.284.5372

1,223170

3< 20< 20< 20

74,200

67030

< .01.8

Max imum

2,53011.98.1463210200

52.017.026.0

113.034.028.0

.526.0275.94

4.103.30

1.00.918.6

3,90016,000

4305

< 2020299

7,2001,200

50< .01

.9


6662.6.4

1155450

13.14.15.3.2

2.05.64.9.1

5.357.13.75.58

.25

.191.5

1101

------2

2,10029012

163

Table 100. Statistical summary of selected water-quality properties forBayou DeView

PropertyChlordaneChlordane in BTMDDDODD in BTMDDEDDE in BTMDDTDDT in BTMDiazinonDiazinon in BTMDieldrinDieldrin in BTMEndosulfanEndosulfan in BTMEndrinEndrin in BTMEthionEthion in BTMHeptachlorHeptachlor in BTMHeptachlor epoxideHeptachlor epoxide in BTMLindaneLindane in BTMMalathionMala th ion in BTMMethoxychlorMethoxychlor in BTMMethyl parathionMethyl parathion in BTMMethyl trithionMethyl trithion in BTMMirexMi rex in BTMParathionParathion in BTMPer thaneSilvexToxapheneToxaphene in BTMTrithionTrithion in BTM2,4-D2,4,5-TSuspended sediment


N53545454535420545254545453313352305326545266

1716

at Morton, Ark., 07077700 Cont inued

25th Min- per- imum centile Median Mean

<<<

<

<

<<<

<

<<<<<<<<<<<<<<<<<<<

<<<<

<<<

.1 <1.0 <.01 <

2.8.01 <

2.1.01 <.4.01 <.1 <.01 <.4.01 < .01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <.1 <.01 <

.01 <

.1 <

.1 <

.01 << 1<10.01 <.1 <.01 <.03

1878

: .1: 1.0: .014.3

: .012.9

: .011.4

: .01: .1: .01

1.6: .01

__C .01C .1C .01c .1C .01C .1C .01c .1C .01C .1C .01C .1C .01: .1C .01: .1C .01c .1C .01

--C .01C .1c .1C .01

< 1<10

: .01: .1C .01

.04

5087

< .1< 1.0< .01

9.3 9.1< .01

7.6 9.1< .01

5.6 5.1< .01< .1

.015.6 4.6

< .01

< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01

< .01< .1< .1< .01

< 1<10

< .01< .1

.05 .04

.08 .11

101 11594 92

75th percentile< .1

9.0< .01

14< .01

17< .018.3

< .01< .1

.016.6

< .01--

< .01.2

< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01

--

< .01< .1< .1

.01< 130

< .01< .1

.06

.17

15697

Max imum

< .19.0

< .0115

< .0119

< .018.9

< .01< .1

.016.8

< .01-_

< .01.2

< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01

--

< .01< .1< .1

.02< 140

< .01< .1

.08

.27

289100


--5.2--

5.0

7.3--

3.6 ----

2.8-------------- ------------ -- -- -------_---- --__.03.09

796

*Includes only discharges corresponding to a water-quality sample,

164

Table 101. Statistical summary of selected water-quality properties forBayou Deview at Morton, Ark.. 07077700 (June through September)

[Number=number of observations, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.=streptococci, BTM=bottom material, ND=not detected, mm=millimeter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), trace metals and pesticides (total or total recoverable in micrograms per liter), and pesticides in bottom material (total in micrograms per kilogram). Alkalinity and hardness are reported as CaCO.~, sufate is reported as SOj., silica is reported as SiOp, and the phosphorus and nitrogen species are reported as P and N]


nitrogenTotal nitrite + nitrateTotal ammoniaBODFecal coliforms(3l625)Fecal strep. (31673)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinAldrin in BTM

N12283030303030303030303030302222303013

301329221771222022211

Min imum.0

1.66.91142538

8.03.26.6.4

1.1< 5.0

4.3< .1

8.064.03.73.67

< .10.031.61170225

< 20< 20< 20

1,60025030

< .01< .1

25th per-

centile91

3.37.42157665

17.06.611.0

.62.313.07.7.2

12.0148.15

1.35.83

.19

.093.180175365

< 20< 20< 20

1,60025030

< .01< .1

Median2144.47.6294110105

27.09.014.0

.62.915.09.7.2

17.5174.18

1.901.20

.43

.163.9155320435

< 20< 20< 20

4,40030040

< .01< .1

Mean3864.27.6290115113

29.49.514.6

.62.916.310.4

.216.4180.21

1.861.27

.46

.244.2 585

------_-

4,40030040

75th per-

centile4015.07.8366161150

40.312.318.2

.73.2

20.313.0

.321.0219.23

2.331.70

.66

.375.0375745905

< 2020

< 20--

7,20035050

< .01< .1

Max imum1,6707.08.1463210200

52.017.026.0

.85.2

34.020.0

.526.0275.56

3.102.00

1.00.707.5

1,9006,700

1005

< 2020

< 20--

7,20035050

< .01< .1


5111.1.3

1065551

13.74.15.0

.1

.96.33.8.1

5.357.11.68.44

.28

.191.5

30.0

4,0007114

165

Table 101. Statistical summary of selected water-quality properties for BayouDeview at Morton, Ark., 07077700 (June through September) Continued

PropertyChlordaneChlordane in BTMODDODD in BTMDDEDDE in BTMDDTDOT in BTMDiazinonDiazinon in BTMDieldrinDieldrin in BTMEndosulfanEndosulfan in BTMEndrinEndrin in BTMEthionEthion in BTMHeptachlorHeptachlor in BTMHeptachlor epoxideHeptachlor epoxideLindaneLindane in BTMMalathionMa lath ion in BTMMethoxychlorMethoxychlor in BTMMethyl parathionMethyl parathion inMethyl trithionMethyl trithion inMirexMirex in BTMParathionParathion in BTMPerthaneSilvexToxapheneToxaphene in BTMTrithionTrithion in BTM2,4-D2,4,5-TSuspended sediment

concentration

N101111111111001111111

in BTM 11111001

BTM 11

BTM 1001101111111

2finer than 0.062 mm (sd)2

Min imum

< .1

< .019.7

< .015.3

< .016.6

< .01< .1

.015.1

< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1

< .01< .1< .01< .1

< .01< .1

< .01< 1

< 10< .01< 0.1

,05.27

7496

25th per

cent ile Median Mean< .1

< .019.7

< .015.3

< .016.6

< .01< .1

.015.1

< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1

< .01< .1< .01< .1

< .01< .1

< .01< 1<10

< .01< .1

.05

.27

7496

< .1

< .019.7 9.7

< .015.3 5.3

< .016.6 6.6

< .01< .1

.01 .015.1 5.1

< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1

< .01< .1< .01< .1

< .01< .1

< .01< 1<10

< .01< .1

.05 .05

.27 .27

163 16396 96

75th per- Max-

cent ile imum< .1 < .1

< .01 < .019.7 9.7

< .01 < .015.3 5.3

< .01 < .016.6 6.6

< .01 < .01< .1 < .1

.01 .015.1 5.1

< .01 < .01< .1 < .1< .01 < .01< .1 < .1< .01 < .01< .1 < .1

< .01 < .01< .1 < .1< .01 < .01< .1 < .1< .01 < .01< .1 < .1

< .01 < .01< .1 < .1< .01 < .01< .1 < .1

< .01 < .01< .1 < .1

< .01 < .01< 1 < 1<10 <10

< .01 < .01< .1 < .1

.05 .05

.27 .27

251 25197 97


------0

--0

--0

----00 ---------- ---------- ---- --------------------

0.00

1251


166

Table 102. Statistical summary of selected water-quality properties for Bayou DeView near Brasfield. Ark., 07077750




N0

1021026219457

93 <93609043 <

74 <102981433468557924857608931 <31 <31 <31 <31 <315 <

30 <3010

Min imum 1.86.6551921

3.01.04.0109.03.05

.10.425

8.4< 10< 20< 20< 20< 20550

< 27< 20.002.002.004.002.002ND.05.04< 2

ND

25th per-

centile

5.27.0842536

6.05.06.5131.13.05

< .101.2225725

< -10< 20< 20< 20< 201,800

110< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median

6.17.21314550

8.07.010.0154.21.09

.101.5629750

< 10< 20< 20< 20< 20

3,70018030

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean

6.57.21455159

9.38.510.3163.21.14

.122.0 61 -- 2036

3,80039051

75th per-

centile

7.97.41877069

14.010.013.2192.28.18

.142.211025598

< 10< 20< 20

2030

5,20025060

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

13.18.2347139160

16.029.022.0286.46.52

.4712.0

1,8002,900

18033

< 2030

230878

9,6008,000

290< .002

.010

.010

.003

.004ND

< .05< .04

< 2ND


2.4.3693030

4.65.54.238.10.12

.081.7 42 36126

2,3001,100

57


167

Table 103. Statistical summary of selected water-quality properties for White River at Clarendon, Ark., 07077800

[N=number of observations, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.=streptococci, BTM=bottom material, ND=not detected, mn=millimeter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), trace metals and pesticides (total or total recoverable in micrograms per liter), pesticides in bottom material (total in micrograms per kilogram), sediment particle-size distribution (percent). Alkalinity and hardness are reported as CaCO~, sulfate is reported as SCL, silica is reported as SiCL, and the pnosphorus and nitrogen species are reported as P and N]


nitrogenTotal nitrite + nitrateTotal ammoniaFecal coliforms( 31625)Fecal strep. (31673)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinAldrin in BTM

N1009798999899999998989998 <9898 <999999 <7545

80 <49 <726355923838381838383622 <8 <


845.56.91124048

12.04.31.6.1.4

5.02.4

.1

.668.01.16.14

.10

.0120

1.0< 1< 20< 20< 20

244060

< 20.01.1

10,6007.57.62039197

23.09.52.9.1

1.45.63.7.1

5.0118.06.58.46

.11

.01114017

1< 20< 20< 20

799012020

< .01< .1

Median17,800

8.47.9238110120

27.011.03.6.1

1.67.14.7.1

5.8131.09.77.59

.20

.033312026

1< 20< 20< 20

131,600

14030

< .01< .1

Mean25,100

8.87.8236109115

27.611.23.9.2

1.67.45.1.1

5.9135.11.90.72

.26

.04 33

1 1717

2,00015045

75th per-

centile33,500

10.18.1278128140

32.013.04.3.2

1.89.05.6

.16.7153.11

1.00.82

.27

.0691

460412

< 20< 20

2118

2,40017057

< .01< .1

Max imum

102,00012.88.8326168170

39.018.019.0

.83.1

24.028.0

.321.0196

1.806.202.60

5.10.14730

3,100100

3< 20

4010098

6,500370150

< .01.1


21,9001.7.4482525

5.82.72.1.1.4

2.72.9.1

2.026.18.77.50

.56

.03----25

1----1821

1,4006435----

168

Table 103. Statistical summary of selected water-quality properties forWhite

Property N

River

Min imum

at Clarendon, Ark., 07077800 Continued

25th per-

centile Median

75th per-



ChlordaneChlordane in BTMODDODD in BTMDDEDDE in BTMDDTDDT in BTMDiazinonDiazinon in BTMDieldrinDieldrin in BTMEn do su If anEndosulfan in BTMEndrinEndrin in BTMEthionEthion in BTMHeptachlorHeptachlor in BTMHeptachlor epoxideHeptachlor epoxideLindaneLindane in BTMMalathionMa lath ion in BTMMethoxychlorMethoxychlor in BTMMethyl parathionMethyl parathion inMethyl trithionMethyl trithion inMirexMirex in BTMParathionParathion in BTMPer thaneSilvexToxapheneToxaphene in BTMTrithionTrithion in BTM2,4-D2,4,5-TSuspended sediment

concentration

218

218

228

228

206

22822

228

206

218

21in BTM 8

218

216

218

21BTM 6

20BTM 6

62

2062

15228

206

1515

92finer than 0.062 mm(sd)92

< .1 << 1< .01 << .1 << .01 << .1 << .01 << .01 << .01 << .1 << .01 << .1 << .01 << .1 << .01 << .1 << .01 << .1 << .01 << .1 << .01 << .1 << .01 << .1 << .01 << .1 << .01 << .1 << .01 << .1 << .01 << .1 << .01 << .1 << .01 << .1 << .1 << .01 <

< 1<10

< .01 << .1 << .01 << .01 <

819

C .1 <C 1 <C .01 <C .1 <C .01 <C .1 <C .01 <C .1 <C .01 <C .1 <C .01 <C .1 <C .01 <C .1 <C .01 <C .1 <C .01 <C .1 <C .01 <C .1 <C .01 <C .1 <C .01 <C .1 <C .01 <( .1 <C .01 <C .1 <C .01 <C .1 <C .01 <C .1 <C .01 <C .1 <C .01 <( .1 <C .1 <C .01 <

< 1<10

( .01 <: .1 <: .01 <: .01 <

4976

.11.01.1.01.1.01.1.01.1.01.1.01.1.01.1.01.1.01.1.01.1.01.1.01.1.01.1.01.1.01.1.01.1.01.1.1.01

< 1<10.01.1.01 0.01.01

63 7987 82

< .1< 1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1

.1< .01

< 1<10

< .01< .1

.01

.01

9894

< .15

< .01.8

< .01.4

< .01< .1

.02< .1< .01

.3< .01< .1< .01

.1

.01< .1

.01< .1

.01< .1< .01< .1< .01< .1

< .01< .1< .01< .1< .01< .1< .01< .1< .01< .1

.1

.01< 1<10

< .01< .1

.03

.03

337100

--

-- --

__

__

.01

5517

*Includes only discharges corresponding to a water-quality sample

169

Table 104. Statistical summary of selected water-quality properties forWhite River at Clarendon, Ark., 07077800 (June through September)

[N=number of observations, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, BTM=bottorn material, ND=not detected, mm=millimeter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 "Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), trace metals and pesticides (total recoverable in micrograms per liter), pesticides in bottom material (total in micrograms per kilogram), sediment particle-size distribution (percent). Alkalinity and hardness are reported as CaCCL, sulfate is reported as SOn, silica is reported as SiOp, and the phosphorus and nitrogen species are reported as P and N]

Property

25thMin- per-


75thper-

Mean centileMaximum

Standarddeviation


nitrogen Total nitrite +

nitrate Total ammonia Fecal coliforms(3l625) Fecal strep.(31673) Turbidity Arsenic Cadmium Chromium Copper Lead IronManganese Zinc

363535363636363636363636 <3636 <3636362921

1255.66.91818291

21.09.22.2.1.6

5.02.6.1.6

106.02.23.14

10,6007.07.8237102113

26.311.03.2.1

1.35.43.9.1

5.5127.06.52.40

14,0007.38.0251116120

30.012.03.8.2

1.67.05.1.1

6.3146.08.66.54

17,0007.48.0255118125

29.912.24.1.2

1.67.45.2.1

6.2146.08.88.57

23,8008.08.2283130140

33.014.04.6.2

1.89.05.6.1

7.1161.10.82.66

62,4008.58.8318160160

39.016.010.0

.42.8

24.014.0

.38.5192.18

6.201.40

1 1 , 900.7.3331918

4.22.01.5.1.4

3.92.0.0

1.422.03

1.06.28

30 < .10 < .10 .19 .32

21 <262621141414145141414

.012013

< 1< 20< 20< 20

2860120

< 20

.01103022

1< 20< 20< 20

31,200

13020

.0130

101262

< 20< 20< 20

71,800

15030

.03-- 272

--15259

1,70017029

.26

.0495

200332

< 20 20 40 17

2,20018033

5.10

.14300820483

< 204010020

3,20032060

.91

.04

8.71

9258

6605412

170

Table 104. Statistical summary of selected water-quality properties for WhiteRiver at Clarendon . Ark ., 07077800 (June through September) Continued

PropertyAldrinAldrin in BTMChlordaneChlordane in BTMDDDDDD in BTMDDEDDE in BTMDOTDOT in BTMDiazinonDiazinon in BTMDieldrinDieldrin in BTMEn do su If anEn do su If an in BTMEndrinEndrin in BTMEthionEthion in BTMHeptachlorHeptachlor in BTMHeptachlor epoxideHeptachlor epoxide in BTMLindaneLindane in BTMMalathionMalathion in BTMMethoxychlorMethoxychlor in BTMMethyl par at hi onMethyl trithionMethyl trithion in BTMMirexMirex in BTMPara th ionPara th ion in BTMPerthaneSilvexToxapheneToxaphene in BTMTrithionTrithion in BTM2,4-D2,4,5-TSuspended sediment


N707070707070700070707070707070070407005707055

3333


< .01

< .1--

< .01--

< .01

< .01__

< .01--

< .01------

< .01__

< .01--

< .01

< .01

< .01--

< .01__

< .01

< .01

< .01--

< .01----

< .01<1

< .01-_

< .01< .01

823

< .01

< .1

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01<1

< .01

< .01< .01

5780

Median< .01

< .1

< .01--

< .01

< .01--

< .01--

< .01------

< .01--

< .01

< .01

< .01

< .01--

< .01--

< .01

< .01

< .01

< .01----

< .01<1

< .01__

.01< .01

7489

75th per- Max-

Mean centile imum < .01 ~ < .1 -- < .01 < .01 -- < .01 -- < .01 -- < .01

< .01 -- < .01 _-

-- < .01 -- < .01 -- < .01

~ < .01

~ < .01 < .01 ~ < .01

< .01 __

.

~ < .01<1

~ < .01__ __

.01 .01

.01 .02

90 9884 95

< .01

< .1

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

.

< .01<1

< .01__

.02

.03

33798

Stan dard devi ation ---------- -------------------------- ---------- ------______ ____.01.01

6816

Includes only discharges corresponding to a water-quality sample,

171

Table 105. Statistical summary of selected water-quality properties for White River at St. Charles. Ark. t 07077820

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hard ness are reported as CaCO~, sulfate is reported as SOj,, and the phosphorus and nitrogen species are reported as P and N]

PropertyDischarge*Dissolved oxygenpHSpecific conductanceTotal alkalinityTotal hardnessDissolved magnesiumSodium adsorption


nitrateTotal ammoniaBODFecal coliforms( 31616)Fecal strep. (31679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDDTDieldrinEndrinLindaneMalathionMethyl parathionToxaphene2,4-D

N3

132127692566155

1241208512073

99127122205558817784522930772626262626249

262615

25th Min- per- imum centile Median7,020

5.57.21205836

3.0.1

< 1.02.561.02

< .05

< .10.522

2.0< 10< 20< 20< 20< 2030037

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

7,0207.87.71888195

9.0.2

4.05.0131.07.13

< .101.7

91425

< 10< 20< 20< 20< 201,100

81< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

7,7208.77.9235110117

12.0.2

5.06.0144.09.20

< .102.3276235

< 10< 20< 20< 20< 201,500

120< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

75th per-

Mean centile13,500

9.07.9225105115

11.1.2

5.66.3144.10.22

.052.5-- 37----------

2,100130--__________------

25,90010.48.1258122133

14.0.2

7.07.4159.13.29

< .103.15816050

< 10< 20< 20< 20< 20

2,800140

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

25,90013.68.532117027017.0

.2

12.025.0185.33.85

.236.055051010012

< 20307026

7,80034040

< .002< .002< .004< .002< .002ND

< .05.26< 2.03


1.80.3492835

3.9.1

2.32.522.05.14

.041.1-- 20----------

1,60067----______-_------


172

Table 106, Statistical summary of selected water-quality properties for Big Creek near Watkins Corner. Ark. t 07077960




N36106106652147109999619244

75106931733468157903854588645454545454514444422

Min imum5.82.76.6421926

4.0< 1.0

3.01

.04< .05

< .10.72

4935

< 10< 20< 20< 20< 20570

< 27< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th per-

centile1325.37.1862846

5.85.06.5158.19.19

.111.84010055

< 10< 20< 20< 20< 202,00022020

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median3806.67.41445381

14.08.010.0198.31.29

.182.410031080

< 10< 20< 20< 20< 20

5,40035035

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean7617.17.422185103

14.79.912.0203.42.34

.213.3

200 . 1822

7,60053050

75th per-

centile9578.77.7303120160

21.714.017.0256.47.45

.253.2295

2,750155

< 10< 20< 20

2031

9,50074064

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

4,10012.28.173931227233.045.034.0372

2.70.85

.8175.0

110,00013,0001,400

17< 20

3026080

33,0002,100

190< .002

.020

.080

.020

.030ND

< .05.52

2ND


9952.2.4

1777767

9.36.87.174.42.20

.157.1

320 3521

7,60043043


173

Table 107. Statistical summary of selected water-quality properties for Big Creek near Watkins Corner. Ark., 07077960 (June through September)


Property



N

263839236

124

3936212916

28393281312272031141619302828282828289

272712

Min imum

5.82.76.7422342

9.0< 1.0

3.51

.04< .05

< .10.92

4935

< 10< 20< 20< 20< 2057010

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th per-

centile

1284.67.21263480

10.05.07.3113.17.22

< .101.9557645

< 10< 20< 20< 20< 201,300340

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median

2905.37.626972140

15.08.012.5212.28.41

.132.422018565

< 10< 20< 20< 20< 20

3,40060026

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

75th per-

Mean centile

5835.37.531480137

15.79.213.4205.52.43

.194.4

250 22

6,80077046

6855.87.949012020522.213.017.8287.53.63

.253.3575875122

< 10< 20< 20< 20

279,8001,300

61< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

4,8008.38.164217823024.024.031.0372

2.70.85

.7475.0

4,6004,5001,400

10< 20

225075

28,0002,100

190< .002

.020

.080

.020

.030ND

< .05.252

ND


9401.1.4

2045667

6.45.57.3100.67.23

.1911.6

449 20

8,10054051 --


174

Table 108. Statistical summary of selected water-quality properties for White River at Arkansas Post Canal near Nady. Ark.. 07078285

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness are reported asCaCO~, sulfate is reported reported as P and N]

Property


nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (31679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDOTDieldrinEndrinLindaneMalathionMethyl parathionToxaphene2.4-D

N

01051027821501099955810047

751011022235535953593727276139384040403910393918

as SOj., and the phosphorus and nitrogen species are

Min imum

2.26.61015826

5.5<1.03.5103

< .01< .05

< .101.0

25

7.8< 10< 20< 20< 20< 20340

< 27< 20

< .002< .002< .004< .002< .002

ND< .05< .04

< 2ND

25th percentile

..7.77.518770816.74.06.0134.07.09

< .101.8

93030

< 10< 20< 20< 20< 2091055

< 20< .002< .002< .004< .002< .002

ND< .05< .04

< 2ND

Median

..8.67.922497108

10.56.07.0152..11.16

< .102.62915535

< 10< 20< 20< 20< 201,700

100< 20

< .002< .002< .004< .002< .002

ND< .05< .04

< 2ND

Mean

..8.77.822796108

10.66.67.5150.11.19

.112.8-- 45-- --

1,900110 ------__ --

75th percentile

9.98.0272117139

13.78.08.5166.15.26

< .103.477

36560

< 10< 20< 20< 20< 20

2,600130

< 20< .002< .002< .004< .002< .002

ND< .05< .04

< 2ND

Max imum

«.«.

12.78.5329160170

16.019.017.0191.33.59

.486.6

1,1002,700

18014

< 202036

< 206,600

48050

< .002< .002< .004

.002

.003ND

< .05.05< 2ND


. .

2.0.4562836

3.83.02.521.06.13

.061.2----30 ----

1,30092----------------------

Includes only discharges corresponding to a water-quality sample,

175

Table 109. Statistical summary of selected water-quality properties for Arkansas River at Murray Dam at Little Rock. Ark.. 07263450

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units),and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hard ness are reported as CaCCL, sulfate is reported as SOu, and the phosphorus and nitrogen species are reported as P and N]



N

25th Min- per- imum c en tile Median

80 800.01201198718618

1131067611165 <

94 <118117135459947711269565510422 <22 <22 <22 <22 <225 <

22 <2211

6.66.71045024

5.05.02.577.04.05

.10.721

2.8< 10< 20< 20< 20< 20< 30

10< 20.002.002.004.002.002ND.05.04< 2

ND

75th per-

Mean centile10,800 29,200 46,700

8.17.63307078

7.028.044.5210.06.09

< .10 <1.3

62

9.5< 10< 20< 20< 20< 2050073

< 20< .002 << .002 << .004 << .002 << .002 <ND

< .05 << .04 <

< 2ND

9.17.9494821099.0

39.077.5299.08.32

.101.6205625

< 10< 20< 20< 20< 2092011021

.002

.002

.004

.002

.002ND.05.04< 2

ND

9.77.9501851079.7

41.092.0312.09.36

.072.0 32 29

1,20012039

Max imum

63,200 218,00011.28.1617101139

11.751.5120.0409.12.53

< .102.311011041

< 10< 20< 20< 20

371,700

14045

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

14.18.7

1,240115170

18.0120.0550.0

579.27

1.60

.2224.088028515028

< 20< 20

70169

3,300790580

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND


1.9.4

2191837

4.018.469.5122.04.26

.042.2 28 35

82012067


176

Table 110. Statistical summary of selected water-quality properties for Arkansas River at David D. Terry Lock and Dam below Little Rock, Ark.. 07263620

[N=number of observations, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.=streptococci, mm=millimeter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), trace metals and pesticides (total or total recoverable in micrograms per liter), and sediment particle-size distribution (percent). Alkalinity and hardness are reported as CaCO.~, sulfate is reported as SOj., silica is reported as Si00 , and the phosphorus and nitrogen species are reported as P and N]

Property

25th Min- per-


75th per-


Standard devi ation



nitrate Total ammonia Fecal coliforms (31625) Fecal strep. (31673) Turbidity Arsenic Cadmium Chromium Copper Lead IronManganese Zinc

1081011091091081071071081081071081091091091081081097842

32966.1.1

135

1238

11411

<

< ...

3643.0.1.5.6.3.0.0.1.286011135

84 < .10

48 < .01 80 68 643233333317333333

1 1

2.0 < 1 <20 <20 <20 < 2 180 40 <20

6,740 16,900 35,9007.47.73646289

25.06.1

36.32

2.729.550.5

.21.2205.08.85.62

8.87.951480120

34.07.7

55.02

3.439.083.0

.23.7286.10

1.00.77

9.27.853279113

32.77.6

60.12

3.439.691.3

.23.9295.10

1.14.84

56,200 162,00010.88.067495140

40.09.1

77.73

3.948.0120.0

.25.3367.12

1.30.98

15.88.6

1,040140170

50.013.0

150.06

6.077.0

220.0.6

48.0558.28

4.803.30

40,2002.1.4

1982131

9.02.2

29.51

.913.047.3

.14.8106.04.68.45

.11

.067822

5.51

<20<20<20

5460 60 20

.24

.104008217

1<20<20<2012

6808030

.29

.11

302

2414

8107932

.43 .70

.13,400280312

<20<203017

9609540

.4616,00010,000

6604

1603011063

2,600140110

.17

.08

821

2414

5702319

177

Table 110. Statistical summary of selected water-quality propertiesfor Arkansas River at David D. Terry Lock and Dam below LittleRock, Ark., 07263620--Continued

Property

AldrinDDEDDTDieldrinEndrinLindaneMalathionMethyl parathionToxaphene2,4-DSuspended sediment


N

1111111110

103103

Minimum

< .01< .01< .01< .01< .01< .01< .01< .01

< 1

214

25thper-

centile

< .01< .01< .01< .01< .01< .01< .01< .01

< 1

2061

Media Mean

< .01< .01< .01< .01< .01< .01< .01< .01

< 1

27 5179 73

75thper-centile

< .01< .01< .01< .01< .01< .01< .01< .01

< 1

4690

Standard


< .01< .01< .01< .01< .01< .01< .01< .01

< 1

644 8499 20

*Includes only discharges corresponding to a water-quality sample,

178

Table 111. Statistical summary of selected water-quality properties for Arkansas River at David D. Terry Lock and Dam below Little Rock. Ark. t 07263620 (June through September)

[N=number of observations, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.=streptococci, mm=millimeter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimer at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), trace metals and pesticides (total or total recoverable in micrograms per liter), and sediment particle-size distribution (percent). Alkalinity and hardness are reported as CaCCL, sulfate is reported as SCL, silica is reported as Si00 , and the phosphorus ana nitrogen species are reported as P and N]

Property

25thMin- per-


75thper-

Mean centileMaximum

Standarddeviation

Discharge* Dissolved oxygen pHSpecific conductance Total alkalinity Total hardness Dissolved calcium Dissolved magnesium Dissolved sodium Sodium adsorption ratio Dissolved potassium Dissolved sulfate Dissolved chloride Dissolved fluoride Dissolved silica Dissolved solids Total phosphorus Total nitrogen Total organic


nitrate Total ammonia Fecal coliforms(3l625) Fecal strep.(31673) Turbidity Arsenic Cadmium Chromium Copper Lead IronManganese Zinc

37373838383737383837383838383838382817

1,2906.17.03615672

20.05.4

42.02

2.633.058.0

.1

.2204

< .01.48.41

1829262691010106101010

.0212

12.0

12020202

40060

< 20

5,9506.97.851880120

35.07.9

53.02

3.440.084.3

.2

.8294.08.80.61

12,200 26,2007.37.963592130

40.08.5

74.53

3.846.0110.0

.23.5353.10.96.78

7.38.065989133

38.38.9

77.73

3.848.4120.4

.24.3363.10

1.18.96

36,400 158,0007.98.277499150

42.510.0

100.044.2

52.3160.0

.35.3427.11

1.281.10

9.78.61020112170

47.013.0

140.05

6.077.0

220.0.6

48.0542.22

4.003.30

34,000.8.3

1671522

6.11.8

27.3.9.8

10.846.2

.17.686.04.79.66

29 < .10 < .10

.065720

4.92

< 20< 20< 20

452068

< 20

.15

.0839048122

< 20< 20< 20

7640 70 25

.22

.09

422

13218

6707729

.39 .70

.121,750

89272

< 20203013

7609238

.1816,0002,500

6604

< 20204914

1,10010070

.19

.04

1301

5135

2001521

179

Table 111. Statistical summary of selected water-quality properties for Arkansas River at David D. Terry Lock and Dam below Little Rock, Ark. t 07263620 (June through September) Continued

Sfcan _dard

Max- devi- Property N imum centile Median Mean centile imum ation

25th 75thMin- per- per-

N imum centile Median Mean centile

AldrinDDEDOTDieldrinEndrinLindaneMala th ionMethyl parathionToxaphene2,4-DSuspended sediment


1111111110

3737

< .01< .01< .01< .01< .01< .01< .01< .01

<1

228

< .01< .01< .01< .01< .01< .01< .01< .01

< 1

2058

< .01< .01< .01< .01< .01< .01< .01< .01

<1

2577

~ < .01~ < .01 < .01 < .01 < .01-- < .01 < .01 < .01

<1

37 3972 90

< .01< .01< .01< .01< .01< .01< .01< .01

< 1

28196

------------ --

4620


180

Table 112. Statistical summary of selected water-quality properties for Arkansas River at Lock and Dam 3 near Swan Lake. Ark. t 07263750

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units),and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hard ness are reported as CaCO~, sulfate is reported as SO^., and the phosphorus and nitrogen species are reported as P and N]



N66103100752050109996569947 <

75 <100991935466455745139437747 <46 <46 <47 <47 <4717 <46 <4724

Min imum0.05.57.01673124

3.27.0.567.02.05

.10.622

2.8< 10< 20< 20< 20< 20160

< 27< 20.002.002.004.002.002ND.05.04< 2

ND

25th per-

centile4,900

8.37.73976374

5.727.060.0232.08.13

< .101.585

8.0< 10< 20< 20< 20< 2039071

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median22,900

9.37.9497741118.0

40.085.5324.12.33

< .102.1802020

< 10< 20< 20< 20< 2097012032

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean37,000

9.77.8521751097.339.897.6346.13.33

.092.4 32 2831

1,50016060

75th per-

centile48,200

10.88.0631901409.048.0150.0464.16.46

.122.632016350

< 10< 20< 20

2130

2,30016057

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

158,00018.98.6

1,1501072509.087.0

280.0598.76.79

.2413.0

2,90057015028

< 2020

350340

5,2001,100900

< .002< .002< .004

.006

.050ND

< .05.043

ND


2.0.3

2021942

2.016.155.4127.09.20

.051.6 130 6353

1,300200117 --


181

Table 113. Statistical summary of selected water-quality properties for Bayou Meto near Lonoke. Ark., 07264000

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 "Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units),and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hard ness are reported as CaCO~, sulfate is reported as SCk, and the phosphorus and nitrogen species are reported as P and N]


nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (3 1679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDOTDieldrinEndrinLindaneMa lath ionMethyl parathionToxaphene2,4-D

N100991007417468

96 <91569644

74 <93921733457350863652548418 <18 <18 <18 <18 <186 <18 <1811


6.2391811

1.61.09.077.08.19

.10.52

253.0

< 10< 20< 20< 20< 20260

< 27< 20.002.002.004.002.002ND.05.04< 2

ND

203.67.01572636

4.28.018.0115.20.36

< .102.187

20520

< 10< 20< 20< 20< 201,000

130< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median1065.27.227461589.012.038.0163.25.50

.142.715550035

< 10< 20< 20< 20

201,80027027

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

75th per-

Mean centile2965.67.23326080

7.717.462.1220.29.48

.173.2 42 1725

2,00036040 __ ____

4567.37.542888120

11.020.062.0250.35.60

.223.437170052

< 10< 20< 20

2030

2,40048050

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum1,97011.28.1

1,53012325011.0

130.0550.01,120

.85

.98

.5012.0

7,40012,000

10022

< 20208970

6,3001,500320

< .002< .002

.010

.006

.006ND

< .05< .04

< 2ND


4092.7.4

2743358

3.718.088.4177.13.18

.121.9 28 1416

1,30033053 __


182

Table 114. Statistical summary of selected water-quality properties for Bayou Meto near Lonoke, Ark., 07264000 (June through September)

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbid ity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness arereported as CaCO^, sulfate is reported gen species are reported as P and N]

Property


nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (3 1679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDDTDieldrinEndrinLindaneMa lath ionMethyl par at hi onToxaphene2,4-D

N

453335265133

3531193215

2731295

1113241626121616296666661772

Min imum

1.00.86.7397644

9.0< 1.0

17.0135.14.23

< .10.52

4006.0

< 10< 20< 20< 20< 2046010

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th per-

centile

102.47.22597765

9.08.037.0162.20.38

< .102.210047020

< 10< 20< 20< 20< 20820390

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

as SCL,

Median

303.17.542398120

11.016.050.0247.23.56

.172.721062030

< 10< 20< 20< 2020

1,60053022

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

and the phosphorus and

Mean

833.17.438491108

10.319.759.0249.28.51

.193.9 33 __2120

1,50063043 ._-_- .

75th per-

centile

664.07.6479103132

11.026.074.0309.33.61

.225.151570040

< 10< 20< 20

2129

2,20080045

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

8485.58.0660107190

11.093.0170.0458.58.71

.5012.0

5,00072010022

< 20< 20

8932

3,3001,500320

< .002< .002< .004

.006

.006ND

< .05< .04

< 2ND

nitro-

Stan- dard devi ation

1641.1.3

15814451.2

17.134.7

91.12.15

.132.9 25 __189

78045062 -- --

"Includes only discharges corresponding to a water-quality sample.

183

Table 115. Statistical summary of selected water-quality properties for Bayou Two Prairie near Cabot. Ark. t 07264050

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units),and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hard ness are reported as CaCO~, sulfate is reported as SOj., and the phosphorus and nitrogen species are reported as P and N]


nitrateTotal ammoniaBODFecal coliforms(3l6l6)Fecal strep. (3 1679)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZincAldrinDDEDDTDieldrinEndrinLindaneMalathionMethyl parathionToxaphene2,4-D

N5295986119476

90 <88539542 <

71 <83901132457752924259619039 <39 <39 <39 <38 <3913 <38 <3818


.0

.55.543913

2.01.04.545.01.05

.101.2

25

4.6< 10< 20< 20< 20< 20320

< 27< 20.002.002.004.002.002ND.05.04< 2

ND

3.02.76.5761320

2.75.08.083.21.18

.222.18838020

< 10< 20< 20< 20< 201,500

165< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Med ian16

4.56.81143536

5.58.011.5102.39.25

.392.918086030

< 10< 20< 20< 20< 201,90060023

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

75th per-

Mean centile65

4.96.81403840

5.88.113.7110.65.28

1.073.9 32 18

2,2001,200

42

646.67.11826256

8.710.018.0137.77.38

1.004.7332

1,60039

< 10< 20< 20

23< 20

3,2001,400

51< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum44511.77.68498291

11.021.039.02017.90.77

9.5020.0

4,4002,200

13030

< 20< 20

12752

4,40013,000

390< .002< .002< .004< .002< .002ND

< .05< .04

5ND


1112.6.4

1172521

3.44.27.535.95.17

1.692.8 24 20

1,0002,100

58


184

Table 116. Statistical summary of selected water-quality properties for Bayou Two Prairie near Cabot. Ark. t 07264050 (June through September)

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbid ity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hardness are reported as CaCO.~, sulfate is reported as SO^, and the phosphorus and nitro gen species are reported as P and Ml

Property



N

273132215

111

2827142913

23232959

12241526131919282323232322237

23238

Min imum

.01.56.4763526

4.0< 1.0

7.0102.01

< .05

.231.5485

6.2< 10< 20< 20< 20< 201,200

13< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th per-

centile

.02.36.91223641

4.04.010.5112.32.24

.352.213120214

< 10< 20< 20< 20< 202,400

700< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Median

32.67.01455455

4.06.513.0132.64.27

.542.822087030

< 10< 20< 20< 20< 20

3,3001,400

32< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean

143.37.01575652

4.07.215.7135.68.37

1.064.2 29 20

3,0002,400

35

75th per-

centile

254.37.32047964

4.09.7

21.0159.92.53

1.456.4350

1,55038

< 10< 20< 20

2120

3,7002,200

50< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

746.67.62698282

4.017.029.0187

2.85.77

6.6013.0

3,8002,200

65< 10< 20< 20

12752

4,30013,000

90< .002< .002< .004< .002< .002ND

< .05< .04

5ND


221.5.3532216-

3.86.128.53.22

1.343.1 18 26

9303,300

25 --

^Includes only discharges corresponding to a water-quality sample. Table

185

Table 117. Statistical summary of selected water-quality properties for Bayou Meto near Bayou Meto. Ark.. 07265099

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.= streptococci, ND=not detected. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units),and trace metals and pesticides (total or total recoverable in micrograms per liter). Alkalinity and hard ness are reported as CaCCL, sulfate is reported as SCL, and the phosphorus and nitrogen species are reported as P and N]



N6511811664206210

1131097310861

89109112214846927010653555810250494949505016495021

Min imum

.02.56.3691912

2.4< 1.0

4.556.03

< .05

< .10.3210

8.0< 10< 20< 20< 20< 20460

< 27< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

25th per-

centile56

4.86.91042738

3.07.011.0133.17.17

< .101.7204435

< 10< 20< 20< 20< 201,700

98< 20

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Med ian9526.07.216041487.09.016.0155.22.24

.102.36811055

< 10< 20< 20< 20< 20

2,900180

< 20< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Mean1,3486.37.21955064

7.010.618.5164.25.25

.122.4 100

3,70024023

75th per-

centile2,070

7.97.42537781

10.513.025.2180.30.33

.152.914860580

< 10< 20< 20< 20< 20

4,80028030

< .002< .002< .004< .002< .002ND

< .05< .04

< 2ND

Max imum

6,05011.48.3678110174

13.043.056.0390.95

1.00

.368.0

4,1674,0002,000

19< 20

206640

14,0001,400

110< .002

.010

.010

.010

.030ND

< .05.36< 2

ND


1243037

3.95.510.452.13.12

.071.2

280

2,90023019


186

Table 118. Statistical summary of selected water-quality properties for Arkansas River at Dam No. 2 near Gillett, Ark., 07265283

[N=number of observations, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.=streptococci, mm=millimeter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 "Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter), sediment particle-size distribution (percent). Alkalinity and hardness are reported as CaCO.-, sulfate is reported as SCk, silica is reported as and the phosphorus and nitrogen species are reported as P and N]

Property

Discharge*Dissolved oxygenPHSpecific conductanceTotal alkalinityTotal hardnessDissolved calciumDissolved magnesiumDissolved sodiumDissolved potassiumDissolved sulfateSodium adsorption ratioDissolved chlorideDissolved fluorideDissolved silicaDissolved solidsTotal phosphorusTotal nitrogenTotal organic

nitrogenTotal nitrite +

nitrateTotal ammoniaFecal coliforms(3l626)Fecal strep. (31673)TurbidityArsenicCadmiumChromiumCopperLeadIronManganeseZinc

N

95919495626258594949914989494961952525

38

434849483136334913474948


.05.97.01573623

4.23.0

21.01.7

10.01

21.0.1.3

139.02.68.33

< .10

< .0112

< 1.0< 10< 20< 20< 20< 220053

< 20

9,5007.87.73836181

23.55.5

40.02.8

28.02

56.0.2

1.6211.08

1.10.68

.16

.052323

6.4< 10< 20< 20< 20< 357090

< 20

Median

26,3008.87.950175110

33.57.7

56.03.3

40.03

78.0.2

4.2286.11

1.20.94

.42

.088518023

< 10< 20< 20< 20< 41,100

11020

Mean

40,8009.27.852277

11131.87.8

64.03.541.3

390.4

.24.8303.13

1.39.92

.42

.10 28-_ 12

1,50012040

75th per-

centile

61,70010.68.061698132

39.39.5

83.54.1

51.03

110.5.3

5.0379.15

1.601.20

.49

.1327064040

< 10< 20< 20

218

2,10016040

Max imum

166,00013.98.6

1,260117170

49.018.0

130.06.3

100.05

310.0.3

65.05401.304.201.50

2.70

.5190,00052,000

80< 10< 20< 20

12775

5,200260302


41,4001.8.3

2082334

9.92.831.81.0

17.41

51.7.1

9.0111.13.67.33

.42

.09 23__--__2621

1,2004454

187

Table 118 Statistical summary of selected water-quality properties for Arkansas River at Dam No. 2 near Gillett. Ark., 07265283 Continued

Property N

25th 75thMin- per- per-imum centile Median Mean centile

Stan dard


AldrinDDEDDTDieldrinEndrinLindaneMalathionMethyl parathionToxaphene2,4-DSuspended sediment

23 < .002 < .002 < .002 21 < .002 < .002 < .00222232300

22230

.004

.002

.002

.04 < 2

.004 <

.002 <

.002 <

.04 < 2

.004,002.002

.04 < 2

< .002 < .002< .002 < .002< .004 .004< .002 < .002< .002 .012

.04 < 2

.10 < 2

concentration 47 finer than 0.062 mm(sd) 47

4 12

15 54

43 67

61 67

77 86

531 98

89 22


188

Table 119. Statistical summary of selected water-quality properties for Arkansas River at Dam No. 2, near Gillett, Ark., 07265283 (June through September)

[N=nuraber of observations, five-digit numbers in parentheses=bacteria parameter codes (see table 2), strep.=streptococci, mm=millimeter, sd=sieve diameter. Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimer at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms per liter), sediment particle-size distribution (percent). Alkalinity and hardness are reported as CaCO~, sulfate is reported as SOn, silica is reported as SiO? , and the phosphorus ana nitrogen species are reported as P and N]

Property

25thMin- per-


75thper-


Standarddevi ation

Discharge* 36Dissolved oxygen 33pH 36Specific conductance 36Total alkalinity 24Total hardness 25Dissolved calcium 23Dissolved magnesium 23Dissolved sodium 19 Sodium adsorption ratio 19

.05.97.53135297

28.06.5

39.02

1.920.046.0

.1

.4198.02.98.44

Dissolved potassium 19Dissolved sulfate 36Dissolved chloride 36Dissolved fluoride 19Dissolved silica 19Dissolved solids 23Total phosphorus 36Total nitrogen 10Total organic 10

nitrogenTotal nitrite + 14 < .10

nitrateTotal ammonia 17 < .01Fecal coliforms(3l625) 18 6Fecal strep.(31673) 19 2Turbidity 19 <1.0Arsenic 10 < 10Cadmium 15 < 20Chromium 14 < 20Copper 19 < 20Lead 5 3Iron 18 270Manganese 18 66Zinc 19 < 20

3,5807.17.950679120

34.07.7

49.02

3.140.071.3

.2

.9294.07

1.10.82

< .10

.0326505.0

< 10< 20< 20< 20

449090

< 20

22,3007.68.059994130

38.08.065.0

33.5

44.098.5

.23.0354.11

1.201.05

.31

.0693

60019

< 10< 20< 20< 20

696010020

32,8007.88.064590132

38.09.0

76.13

3.850.0115.7

.22.9367.14

1.581.01

.46

.07----21------__19

1,10012029

41,200 144,0008.48.1770103140

41.010.0100.0

44.1

56.2147.5

.35.0451.14

1.651.30

10.48.61260110170

48.013.0

130.05

6.392.0310.0

.36.35401.304.201.40

.52

.10355

4,80030

< 10 < 20 < 20 < 20

411,300

14031

2.70

.1890,00052,000

80.0< 10< 20

2011075

4,600 200 140

37,1001.0.2

2021620

5.81

30

11556

991123

.12.097.20.96.33

.68

.05

21.8

311,000

4230

189

Table 119. Statistical summary of selected water-quality properties for Arkansas River at Dam No. 2, near Gillett, Ark.. 07265283 (June through September) Continued

___

dardMax- devi-

Property_____________N imum centile Median Mean centile imum ation

25th 75thMin- per- per-imum centile Median Mean centile

AldrinDDEDOTDieldrinEndrinLindaneMalathionMethyl parathionToxaphene2,4-DSuspended sediment

16 < .002 < .002 < .002 < .002 < .0021416161616016160

.002 < .002 < .002

.004 < .004 < .004

.002 < .002 < .002

.002 < .002 < .002ND ND ND

.04 < .04 < .04< 2 < 2 < 2

< .002 < .002< .004 < .004< .002 < .002< .002 < .002

ND

.04 < 2

ND

.10 < 2

concentration finer than 0. 062 mm (sd)

19 19

4 12

11 44

43 57

86 59

78 84

531 98

132 25


190

Table 120. Water quality of selected rivers in study area

[Ranges and single values shown are representative of medians for individual stations operated by Arkansas Department of Pollution Control and Ecology or U.S. Geological Survey as part of water-quality programs. Letters following typical values indicate most common directions of time trends (most common direction listed first): increasing (I), decreasing (D), or no trend (NT). °C= degrees Celsius, jiS = microsiemens per centimeter at 25 °Celsius, mg/L = milligrams per liter, CaCCL = calcium carbonate, mL = milliliters, and ng/L = micrograms per liter]

River and number of stations

Arkansas River (4)Bayou Meto-Bayou Two PrairieBlack River-Current River (5)Cache River-Bayou DeView (6)St. Francis River (4)St. Francis River tributariesWhite River (7)



Specificconductance

in jiS

490-520 (NT)(3) 110-275 (NT)

230-300 (NT)130-190 (NT)185-310 (NT)

(6) 245-470 (NT)225-285 (NT)

Dissolvedsulfate as

SCL, in mg/L

40 (NT)(3) 8-12 (I)

4- 8 (I)6-16 (NT, I)9-19 (I, NT)

(6) 12-32 (NT)5- 8 (I)

Total Total hard-alkalinity ness in mg^L

in mg/L as CaCCL

70- 8535- 65100-16040- 7070-13070-20095-145

Dissolvedchloride,in mg/L

75-85 (NT)10-40 (NT)3- 6 (NT)7-17 (I, NT)6- 8 (I, NT)6-13 (NT)4- 7 (NT)

as CaCCL

110-12035- 60115-16540- 6590-14075-110110-145

Dissolvedsolids,in mg/L

285-325100-165140-185100-210130-200140-310130-170

0-60 mg/L, soft; 61-120 mg/L, moderately hard; 121-180 mg/L, hard; greater than 180 mg/L, very hard (from Durfor and Becker, 1964, p. 27) in Hem, 1985, p. 159).

191

Table 120. Water quality of selected rivers in study area Continued



Total phosphorus as P, in mg/L

0.08- .12 (NT)(3) .20- .40 (NT)

.04- .09 (NT)

.20- .97 (NT)

.13- .32 (NT)(6) .21- .70 (NT)

.03- .11 (NT)

Total Total nitrite ammonia as plus nitrate N, in mg/L as N, in mg/L

<0.10- .10 (D) 0.20- .42.10- .40 (NT) .25- .50

< .10 (D) .15- .25.10- .20 (D) .10- .68

< .10- .11 (D) .09- .41< .10- .31 (NT) .05- .63

< .10 (D) .15- .27


5-day bio chemical

oxygen demand, in mg/L

Fecal coli- Turbidity, inform bacteria, nephelometriccolonies per turbidity

100 mL units

Arkansas River (4)Bayou Meto-Bayou Two Prairie (3)Black River-Current River (5)Cache River-Bayou DeView (6)St. Francis River (4)St. Francis River tributaries (6)White River (7)

1.5-2.52.3-2.91.5-2.12.5-4.92.6-3.22.3-5.41.9-2.6

20-400 (D,NT)70-180 (NT)20- 60 (NT)60-400 (D)50-170 (D,NT)20-285 (D,NT)25- 70 (NT,D)

15- 2530- 555- 2545-10030- 9025- 855- 35


Total Total Totalarsenic, recoverable recoverablein iJtg/L cadmium, in \ig/L chromium, in \ig/L


<20 <20 <20 <20 <20 <20 <20 <20

<20 <20 <20 <20 <20 <20 <20

192



Arkansas River (4)Bayou Me to-Bay ou Two PrairieBlack River-Current River (5)Cache River-Bayou DeView (6)St. Francis River (4)St. Francis River tributariesWhite River (7)


Arkansas River (4)Bayou Me to-Bay ou Two PrairieBlack River-Current River (5)Cache River-Bayou DeView (6)St. Francis River (4)St. Francis River tributariesWhite River (7)

Totalrecoverable

copper, in w?/L

<20(3) <20

<20<20<20

(6) <20<20

Totalrecoverable

manganese, in ng/L

80-120(3) 180-600

70-180300-440170-340

(6) 140-52070-150

Total Total

Total Totalrecoverable recoverable

iron, in |ig/L lead, in ng/L

700-1,1001,800-2,900350-1,400

1,800-4,8002,300-7,6001,700-4,900250-1,700

Totalrecoverable

zinc, in p.g/L

20-35<20-27

<20<20-40<20-60<20-50<20-40

Total TotalDDE, DDT, dieldrin, endrin,



in jig/L in jig/L

<0.01 <0.01(3) < .002 < .004

< .002 < .004< .01 < .01 << .01 < .01

(6) < .01 < .01 << .01 < .01

in jig/L in jig/L

<0.01 <0.01< .002 < .002< .002 < .002.01-. 01 < .01< .01 < .01.002-. 01 < .01< .01 < .01

< 20< 20< 20< 20< 20< 20< 20

Totalaldrin,in jig/L

<0.01< .002< .002< .01< .01< .01< .01

Totallindane,in jig/L

<0.01NDND

< .01ND

< .01< .01

193




Totalmalathion,in ng/L

<0.05< .05< .05< .05< .05< .05< .05

Totalmethylparathion,in jig/L

<0.04< .04< .04< .04< .04< .04< .04

Totaltoxa-phene ,in fig/L

<2<2<2<2<2<2<2

Total2,4-Din ng/L

NDNDND

ND-0.05ND

ND- .04ND


Suspended sedimentSuspended sediment, percent finer than ____in mg/L______0.062 millimeters


27- 43

67-101103-17451-23759- 74

67-79

93-94 74-96 65-97 80-87

194

Table 121. Statistical summary of daily discharge and suspended sediment data for Cache River at Patterson, Ark.. 07077500

[Water year 1988 summarized. Number of observations was 366. Highest suspended sediment concentrations occurred at discharges of 1,000 to 2,500 cubic feet per second. Suspended sediment concentrations seldom exceeded 75 milligrams per liter at discharges greater than 4,000 cubic feet per second]

Mean Mean discharge suspended sediment (cubic feet concentration per second) (milligrams per liter)

Minimum

10th Percentile

20th Percentile

30th Percentile

40th Percentile

50th Percentile

60th Percentile

70th Percentile

80th Percentile

90th Percentile

95th Percentile

99th Percentile

Maximum

5

22

63

247

393

603

824

1,050

1,610

2,870

3,600

8,200

9,110

18

37

46

55

64

72

82

98

132

183

235

292

310

Suspended sediment discharge

(tons per day)

<1

3

12

53

85

118

166

313

443

645

933

2,060

3,240

195

Table 122. Statistical summary of daily discharge and suspended sediment data for Cache River near Cotton Plant. Ark.. 07077555

[Water year 1988 summarized. Number of observations was 366. Highest suspended sediment concentrations occurred at discharges of less than 1,000 cubic feet per second. Suspended sediment concentrations seldom exceeded 60 milligrams per liter at discharges greater than 4,000 cubic feet per second]

Mean Mean discharge suspended sediment (cubic feet concentration per second) (milligrams per liter)

Minimum

10th Percentile

20th Percentile

30th Percentile

40th Percentile

50th Percentile

60th Percentile

70th Percentile

80th Percentile

90th Percentile

95th Percentile

99th Percentile

Maximum

25

50

107

257

492

723

987

1,200

1,810

3,490

5,520

8,690

9,290

22

38

46

54

63

71

81

92

116

154

207

263

346


(tons per day)

3

10

35

70

99

143

215

286

333

448

606

1,360

1,760

196

Table 123. Statistical summary of daily discharge and suspended sedimentdata for St. Francis

[Water years 1986 through 1988 The relation between suspended variable but highest suspended of approximately 1,000 to 5,000

Meandischarge (cubic feet per second)

Minimum 71

10th Percentile 82

20th Percentile 248

30th Percentile 362

40th Percentile 548

50th Percentile 826

60th Percentile 1,260






Maximum 11,600

River at St. Francis, Ark., 07040100

summarized. Number of observations was 1,096. sediment concentration and discharge is highly sediment concentrations occurred at discharges cubic feet per second]

Meansuspended sediment

concentration (milligrams per liter)

19

70

89

107

131

159

187

224

294

482

720

1,700

4,050


(tons per day)

4

49

84

129

208

359

629

1,150

1,780

3,100

5,090

20,300

43,200

197

Table 124. Statistical summary of pesticides data for a selected U.S. ArmyCorps of Engineersof Trumann, Ark.

station on Whitemans Creek about 4 miles northwest

[U.S. Army Corps of Engineers provided data upon which summary Concentrations in water are in micrograms per liter. Data are 1983 through August 1985]

Pesticide

Aldrin

Chlordane

DDD

DDE

DOT

Diazinon

Dieldrin

Endrin

Ethion

Ethyl pa rath ion

Heptachlor

Lindane

Malathion

Methoxychlor

Methyl par a th ion

Toxaphene

Number of

observation

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

9

Minimum

< 0.01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

Median

< 0.01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .01

< .5

is based, for August

Max imum

< 0.01

< .01

< .01

.02

< .01

< .01

< .01

< .01

< .01

< .01

< .01

.01

< .01

< .01

< .01

< .5

198

Table 125. Statistical summary of pesticides data for a selected U.S. ArmyCorps of Engineers station on Eightmileof Paragould, Ark.

[U.S. Army Corps of Engineers providedBTM=bottom material . Concentrations in

Creek about 5 miles southeast

data upon which summary is based.water are in

Concentrations in bottom material are in microgramsfor January 1986 through December 1987]

Numberof

Pesticide observation Minimum

Aldrin 9 <Aldrin in BTM 1 <Chlordane 9 <Chlordane in BTM 1 <DDD 9 <DDD in BTM 1 <DDE 9 <DDE in BTM 1 <DDT 9 <DDT in BTM 1 <Diazinon 9 <Diazinon in BTM 1 <Dieldrin 9 <Dieldrin in BTM 1 <Endrin 9 <Endrin in BTM 1 <Ethion 9 <Ethion in BTM 1 <Heptachlor 9 <Heptachlor in BTM 1 <Lindane 9 <Lindane in BTM 1 <Malathion 9 <Malathion in BTM 1 <Methoxychlor 9 <Methoxychlor in BTM 1 <Methyl parathion 9 <Methyl parathion in BTM 1 <Parathion 9 <Parathion in BTM 1 <Toxaphene 9 <Toxaphene in BTM 1 <

0.0110.01

10.01

10.01

10.01

10.01

10.01

10.01

10.01

10.01

10.01

10.01

10.01

10.01

10.01

10.5

500

microgramsper kilogram

Median

< 0.01< 10< .01< 10< .01< 10< .01< 10< .01< 10< .01< 10< .01< 10< .01< 10< .01< 10< .01< 10< .01< 10< .01< 10< .01< 10< .01< 10< .01< 10< .5< 500

per liter. Data a;

Max imum

< 0.01< 10< .1< 10< .1< 10< .1< 10< .1< 10

1.1< 10< .1< 10< .1< 10< .1< 10< .1< 10< .1< 10< .1< 10< .1< 10< .1< 10< .1< 10< .5< 500

199

Table 126. Bottom-material pesticide quality at selected locations in study area

[Values are medians in micrograms per kilogram. Data for basins are from Lamb (1979), Bryant and others (1979), Petersen (198la), Lamb (1978a) and Lamb (1978b)]

Aldrin

Bayou DeView at Mo r tonBlack River at Black RockCache River at PattersonFlat Bayou basinL'Anguille River near ColtL'Anguille River basinLark in Creek basinSt. Francis River at ParkinTyronza River basinVillage Creek basinWhite River at Clarendon

<<

<<<<<

0.2.1.1.1.6.4.1.1.1.1.1

Diazinon

Bayou DeView at MortonBlack River at Black RockCache River at PattersonFlat Bayou basinL'Anguille River near ColtL'Anguille River basinLarkin Creek basinSt. Francis River at ParkinTyronza River basinVillage Creek basinWhite River at Clarendon

<<<<<

<<<<<

0.1.1.1.1.1 .1.1.1.1.1

Chlordane ODD

o1

<1<1<1<1<1< 1<1<1<1

Dieldrin

5.6.1.4.1

3.82.51.0.6.1

< .1< .1

9.3.3

2.27617185.3

< .11.05.1

< .1

En do su If an

_

< .1

< .1< .1

DDE

7.6.3

2.51001616< .1< .11.15.9

< .1

Endrin

<0.1< .1< .12.6.4

< .1.2

< .1< .1< .1< .1

DOT

5.6< .14.1135.66.41.9

< .1.6

3.4< .1

Ethion

<0.1< .1< .1< .1< .1

< .1< .1< .1< .1< .1

200

Table 126. Bottom-material pesticide quality at selectedlocations in study area Continued

Heptachlor Heptachlor epoxide Lindane


<0.< .< .< .< .< .< .< .< .< .< .

,1111111111

Methylparathion


<0.< .< .< .< .

< .< .< .< .< .

!1111

11111

<<<

<<<<<<<

0.1.1.1.1.1.1.1.1.1.1.1

<0.1< .1< .1< .1< .1< .1< .1< .1< .1< .1< .1

Methyltrithion

<<<<<

<<<<<

.

.

.

.

.

.

.

.

.

,1111

11111

Mirex

< .1< .1

< .1

Malathion

<<<<<

<<<<<

Parathion

<<<<<

<<<<<

0.1.1.1.1.1 .1.1.1.1.1

0.1.1.1.1.1 .1.1.1.1.1

Toxa-phene

<<<<<<

<<<<

1010101010103010101010

Methoxy- chlor

<0.1'.6

< .1< .1< .1

< .1< .1< .1< .1< .1

Trithion

<0.1< .1< .1< .1< .1

< .1< .1< .1< .1< .1

201

Table 127. Selected water-quality standards and criteria

[Standards and criteria are often for specific conditions. Refer to cited reference for complete descriptions. M9/ L = microgram per liter, mg/L = milligrams per liter, NTU = nephelometric turbidity unit]

Property and

units

Aldrin (ug/L.)

Ammonia as N (mg/L)Arsenic (ug/L)Fecal coliform bacteria

(colonies/ 100 mL)Chlordane (ug/L)

Chloride (mg/L)

Copper (pg/L)DOT (ug/L)DDE (Mg/L)Dieldrin (ug/L)Endosulfan (ug/L)Endrin (ug/L)Heptachlor (ug/L)Iron (ug/L)

Lead (Mg/L)Lindane (ug/L)Malathion (ug/L)Methoxychlor (ug/L)Mirex (ug/L)

Oxygen, dissolved (mg/L)Parathion (ug/L)

Total phosphorus (ug/L)Solids, dissolved

(mg/L)Sodium adsorption

ratioSulfate (mg/L)

Turbidity (NTU)Toxaphene (ug/L)

Zinc (Mg/L)

Arkansas Freshwater water- aquatic life

qual ity acute

standards3 criteria

3.0----

d 2002.4

610-250

--1.11.12.5.22.18.52--

--.08------

2-5--

j .100

180-600

__20-100

45-75.73--

4.0C50-200

--

_-2.4

8609 181.1

1,0501.0.22.18.52--

9822.0.01----

h3.0

.065--

__

__--

--.73

9 120

Freshwater aquatic 1 i fe

chronic

criteria

__

C0.7-2--

__.0043

230g12.001--.0019.056.0023.00381,00093.2.08--.03.001

Vo.013--

-_

__--

Variable1".00029 110

Fish consumption Irrigation

criteria criteria

0.000079__

17,500

__.00048

f709

__.000024

--.000076159__.0002__

__.045____--

__--__

k500- 1,000

'IB--

__.0002--

Arkansas Department of Pollution Control and Ecology (1988)

U.S. Environmental Protection Agency (1986)

cRange based on pH of 7 to 8 and temperature range of 10 to 25 "Celsius. See U.S. Environmental Protection Agency (1986) for tables.

30-day geometric mean between April 1 and September 30 in primary contact waters

eNot to be exceeded in more than 1 of 10 samples collected during 30 to 360 days

20 mi 11iequivalents per liter (709 mg/L) (National Academy of Sciences-National Academy of Engineering, 1974)

9Value shown is for hardness of 100 mg/L

Warm-water instantaneous minimum to protect all but early life stages

Warm-water 7-day mean to protect early life stages ^Guidel ine onl y kCan have detrimental effects on sensitive crops (in U.S. Environmental ProtectionAgency, 1986 from National Technical Advisory Committee, 1968)

Sodium adsorption ratio of 8 to 18 generally considered usable for general crops (in U.S. Environmental Protection Agency, 1986 from National Technical Advisory Committee, 1968)

Settleable and suspended solids should not reduce the depth of the compensation point for photosynthetic activity by more than 10 percent from the seasonally established norm

202

Table 128. Detected water-quality differences between Little Red River at Judsonia (07076634) and Bayou Two Prairie near Cabot (07264050)

[Listed are properties with significantly different (p <0.10) mean values. June through September data were ranked and compared with a t-test. p is the probability associated with the computed t-statistic The five-digit numbers in parentheses are parameter codes]

PropertyRiver with higher mean value

Dissolved oxygen < 0.001

Specific conductance < .001

Total alkalinity .001

Total hardness < .001

Dissolved sulfate < .001

Dissolved chloride < .001

Dissolved solids < .001

Total phosphorus < .001

Total nitrite plus nitrate .011

Total ammonia < .001

Biochemical oxygen demand < .001

Fecal coliforms (31616) .009

Turbidity .027

Total recoverable iron < .001

Total recoverable manganese < .001

Toxaphene .003

Little Red River

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

203

Table 129. Minimum, median, and maximum values of selected water-quality properties for Wattensaw Bayou near Hazen. Ark.. 07076950 (water years 1984 through 198?)

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2). Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms perliter). Hardness is reported as CaCXL, sulfate is reported as phosphorus and nitrogen species are reported as P and N]

SO, and the

Property Minimum Median Maximum

DischargeDissolved oxygenPHTotal hardnessDissolved sulfateDissolved chlorideDissolved solidsTotal phosphorusTotal nitrite + nitrateTotal ammoniaBODFecal coliforms (31616)TurbidityCadmiumChromiumCopperLeadZincAldrinDDEDDTDieldrinEndrinLindaneMethyl parathionToxpahene

31444434424645414640414541414045393483338338

01.16.5

223.03.012

.05

.01< .011.347.8

<27<10<15<1

<10<.002<.001<.002<.001<.001<.01<.01

<1

247.27.3

658.014

145.17.17.06

2.617040

<27<10<15

430<.002<.001<.002<.001<.001<.01<.01

<1

76012.68.2

1703848

285.44

1.2.32

6.45,600

180<27102818

210.002

<.001<.002<.001.002

<.01<.01

<1


204

Table 130. Detected water-quality differences between White River at DeValls Bluff (07077000) and Bayou Two Prairie near Cabot (07264050)

[Listed are properties with significantly different (p <0.10) mean values. June through September data were ranked and compared with a t-test. p is the probability associated with the computed t-statistic, The five-digit number in parentheses is a parameter code]


Discharge < 0.001

Dissolved oxygen < .001

pH < .001


Total alkalinity < .001


Dissolved sulfate .022


Dissolved solids .073




Biochemical oxygen demand .015

Fecal coliforms (31616) < .001

Total recoverable cadmium .048

Total recoverable copper .055


Total recoverable zinc .025

2,4-D .074

White River

White River

White River

White River

White River

White River

Bayou Two Prairie

Bayou Two Prairie

White River

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

White River

205

Table 131. Detected water-quality differences between ArkansasRiver at David D. Terry Lock and Dam below Little Rock (07263620)and Bayou Meto near Lonoke (07264000)

[Listed are properties with significantly values. June through September data were t-test. p is the probability associated

Property p

Discharge < 0.001


pH < .001


Total hardness .026

Dissolved magnesium .098





Total nitrite plus nitrate < .001

Total ammonia .001

Turbidity < .001

Total arsenic .064

Total recoverable iron .001


Total recoverable lead .099

different (p <0.10) mean ranked and compared with

with the computed t-statis

River with higher mean value

Arkansas River

Arkansas River

Arkansas River

Arkansas River

Arkansas River

Bayou Meto

Arkansas River

Arkansas River

Arkansas River

Bayou Meto

Bayou Meto

Bayou Meto

Bayou Meto

Bayou Meto

Bayou Meto

Bayou Meto

Bayou Meto

206

Table 132. Detected water-quality differences between Arkansas River at David D. Terry Lock and Dam below Little Rock (07263620) and Bayou Two Prairie near Cabot (07264050

[Listed are properties with significantly different (p <0.10) mean values. June through September data were ranked and compared with a t-test. p is the probability associated with the computed t-statistic]


Discharge < 0.001


pH < .001


Total alkalinity .002








Turbidity .003

Total arsenic .092

Total recoverable cadmium .073

Total recoverable iron < .001


Arkansas River

Arkansas River

Arkansas River

Arkansas River

Arkansas River

Arkansas River

Arkansas River

Arkansas River

Arkansas River

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

Bayou Two Prairie

207

Table 133. Detected water-quality differences between Black River at Black Rock (07072500) and Bayou DeView near Gibson (07077660)


Property

Discharge

Dissolved oxygen

PH

Total hardness

Dissolved sulfate

Dissolved chloride

Dissolved solids

Total phosphorus

Total ammonia

Biochemical oxygen demand

Turbidity

P

< 0.001

.012

.004

.005

< .001

< .001

< .001

< .001

.053

< .001

< .001


Black River

Black River

Black River

Black River

Bayou DeView

Bayou DeView

Bayou DeView

Bayou DeView

Bayou DeView

Bayou DeView

Bayou DeView

208

Table 134. Detected water-quality differences between Black River at Black Rock (07072500) and Bayou DeView at Morton (07077700)

[Listed are properties with significantly different (p <0.10) mean values. June through September data were ranked and compared with a t-test. p is the probability associated with the computed t-statistic, The five-digit number in parentheses is a parameter code]

Property

Discharge

Dissolved oxygen

PH

Total alkalinity

Total hardness

Dissolved magnesium

Sodium adsorption ratio

Dissolved sulfate

Dissolved chloride

Total phosphorus

Total nitrite plus nitrate

Total ammonia


Fecal streptococci (31673)

Turbidity

P

< 0.001

< .001

< .001

.096

.027

< .001

< .001

< .001

< .001

< .001

.005

.002

< 001

.073

< .001


Black River

Black River

Black River

Black River

Black River

Black River

Bayou DeView

Bayou DeView

Bayou DeView

Bayou DeView

Bayou DeView

Bayou DeView

Bayou DeView

Bayou DeView

Bayou DeView

209

Table 135. Detected water-quality differences between Black River at Black Rock (07072500) and L'Anguille River near Colt (07047942)

[Listed are properties with significantly different (p <0.10) mean values. June through September data were ranked and compared with a t-test. p is the probability associated with the computed t-statistic, The five-digit numbers in parentheses are parameter codes]

Property

Discharge

Dissolved oxygen

pH

Specific conductance

Sodium adsorption ratio

Dissolved sulfate

Dissolved chloride

Dissolved solids

Total phosphorus


Total ammonia


Fecal coliforms (31625)

Fecal streptococci (31673)

Turbidity

P

< 0.001

< .001

< .001

.010

< .001

< .001

< .001

.034

< .001

.015

.010

< .001

.067

.002

< .001


Black River

Black River

Black River

L'Anguille River

L'Anguille River

L'Anguille River

L'Anguille River

L'Anguille River

L'Anguille River

L'Anguille River

L'Anguille River

L'Anguille River

L'Anguille River

L'Anguille River

L'Anguille River

210

Table 136. Detected water-quality differences between Black River at Black Rock (07072500) and L'Anguille River at Marianna (070*179610

[Listed are properties with significantly different (p <0.10) mean values. June through September data were ranked and compared with a t-test. p is the probability associated with the computed t- statistic]

Property

Discharge

Dissolved oxygen

PH

Dissolved sulfate

Dissolved chloride

Dissolved solids

Total phosphorus


Total ammonia


Turbidity

P

0.008

< .001

< .001

< .001

< .001

.037

< .001

.022

.016

< .001

< .001


Black River

Black River

Black River

L'Anguille River

L'Anguille River

L'Anguille River

L'Anguille River

L'Anguille River

L'Anguille River

L'Anguille River

L'Anguille River

211

Table 137. Detected water-quality differences between Black River at Black Rock (07072500) and Big Creek near Watkins Corner (07077960)


Property

Discharge

Dissolved oxygen

PH

Total alkalinity

Dissolved sulfate

Dissolved chloride

Dissolved solids

Total phosphorus


Total ammonia


Turbidity

P

< 0.001

< .001

< .001

.013

.009

< .001

.088

< .001

.015

.007

< .001

< .001


Black River

Black River

Black River

Black River

Big Creek

Big Creek

Big Creek

Big Creek

Big Creek

Big Creek

Big Creek

Big Creek

212

Table 138. Detected water-quality differences between White River at DeValls Bluff (07077000) and Big Creek near Watkins Corner (07077960)

[Listed are properties with significantly different (p <0.10) mean values. June through September data were ranked and compared with a t-test. p is the probability associated with the computed t-statistic The five-digit number in parentheses is a parameter code]

Property

Discharge

Dissolved oxygen

PH

Total alkalinity

Dissolved sulfate

Dissolved chloride

Dissolved solids

Total phosphorus


Total ammonia

Fecal conforms (31 61 6)

Turbidity

Total recoverable copper

Total recoverable lead

Total recoverable iron

Total recoverable manganese

2,4-D

P

< 0.001

< .001

< .001

.034

< .001

< .001

.039

< .001

< .001

< .001

.001

< .001

.098

.007

.048

.003

.073


White River

White River

White River

White River

Big Creek

Big Creek

Big Creek

Big Creek

Big Creek

Big Creek

Big Creek

Big Creek

Big Creek

Big Creek

Big Creek

Big Creek

White River

213

Table 139. Minimum, median, and maximum values of selected water-quality properties for Boat Gunwale Slash near Holly Grove. Ark., 07077862 (water years 1984 through 1987)

[N=number of observations, BOD=5-day biochemical oxygen demand, five-digit numbers in parentheses=bacteria parameter codes (see table 2). Units are milligrams per liter (mg/L) except discharge (cubic feet per second), pH, specific conductance (microsiemens per centimeter at 25 °Celsius), bacteria (colonies per 100 milliliters), turbidity (nephelometric turbidity units), and trace metals and pesticides (total or total recoverable in micrograms perliter). Hardness is reported as CaCO~, sulfate is reported as phosphorus and nitrogen species are reported as P and N]

SO, and the

Property

DischargeDissolved oxygenPHTotal hardnessDissolved sulfateDissolved chlorideDissolved solidsTotal phosphorusTotal nitrite + nitrateTotal ammoniaBODFecal coliforms (31616)TurbidityCadmiumChromiumCopperLeadZincAldrinDDEDDTDieldrinEndrinLindaneMethyl parathionToxpahene

N

041433439404440453939454440424241281688

11168

1116

Minimum

..0.16.1

241.02.0

34.06

< .01< .010.342.0

<27<10<15<1

<10<.002<.001<.002<.001<.001<.01<.10

<1

Median

..3.67.0

566.05.0

110.20.03.06

2.27015

<27<10<15

230<.002<.001<.002<.001<.001<.01<.10

<1

Max imum

10.67.8

1409413

2173.4.31

3.719

2,900360<2752322280<.002.002.006.003.004

<.01<.10

<1

214

Table 140. Statistical summary of selected water-quality properties of water from the alluvial aquifer in potential artificial recharge areas

[Number=number of observations, five-digit numbers in parentheses=bacteria parameter codes (see table 2), N0=not detected. Units are milligrams per liter except pH, turbidity (nephelometric turbidity units), bacteria (colonies per 100 mi I Ii1iters), and total and dissolved iron (micrograms per liter). Hardness and alkalinity arereported as CaCO^, sulfate is reported as

nitrate is reported as N]

SO, silica is reported as SiO, and

Property N Mini mum25th 50th 75th

percentile percentile percentile Maximum

Grand Prairie area (Arkansas, Lonoke, and Prairie Counties)

pHFecal col i forms

(31616)Fecal coliforms

(31625)Total hardnessTotal alkalinityDissolved calciumDissolved magnesiumDissolved sodiumDissolved potassiumDissolved sulfateDissolved chlorideDissolved fluorideDissolved silicaDissolved solidsTotal nitrateDissolved nitrateTotal recoverable ironDissolved iron

193

2

118112160581721421241991920592

489841

5.6

1

110112.21.12.3.40

52.0.1

8.688

.02

.01NDND

7.1

1

1150138338.4161.4516

.1015

186.02.07

4,40030

7.4

1

12401805514262.0

1028

.2026

260.04.12

1 2 , 000120

8.0

1

13502688221483.1

2257.30

33436

.07

.2217,000

980

8.6

1

1640474190441205.9

200400

.5042

832.07

5.240 . 0006.000

West of Crowleys Ridge (Cross, Poinsett, St. Francis, and Woodruff Counties)

pHFecal coliforms

(31616)Fecal col 1 forms

(31625)Total hardnessTotal alkalinityDissolved calciumDissolved magnesiumDissolved sodiumPotassiumSulfateChlorideFluorideDissolved si 1 icaDissolved solidsTotal nitrateDissolved nitrateTotal recoverable ironDissolved iron

30

0

030303030303030308

27110

113

28.

5.

--

--13102.1.3.

.

.1.

2.235

--

490ND

5

26917513

01

6.

--

--6677156.6.1.5.4.

m

25342

--

4903

7

470661

01

7.

--

--17018645139.1.9.6.

,

32369

--

3,70012

0

04742

02

7.6

--

--2602767220161.7

1511

.235

411--

.236,4001.100

8.

--

--3303419230453.

13023

.36

465--

6,4006.900

2

1

3

81

215 ft U.S. GOVERNMENT PRINTING OFFICE; 1990 748-130/20009

water-resources investigations report 90-4017 · tables (continued) page 59. st. francis river at...

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