march 26, 2020 lead environmental engineer land

1020 Holland Drive

Suite 104

Boca Raton, Florida 33487

Tel: 561-962-2294

Mobile – (561) 866-8202

March 26, 2020

Mr. Robert Taylor

Lead Environmental Engineer

Land Acquisition Support Division

South Florida Water Management District

3301 Gun Club Road

West Palm Beach, Florida 33406

Re: Evaluation of Stockpiled Soils and Soil Management Plan

STA-1West Expansion

Palm Beach County, Florida

COM_323591

Job # 60616094

Dear Mr. Taylor:

1.0 INTRODUCTION

AECOM Technical Services, Inc. (AECOM) is pleased to present this letter report ) for the

evaluation of stockpiled soils located in the southeast area of the Stormwater Treatment

Area (STA) 1West Expansion # 1 just south of the STA footprint and west of the District’s

L-7 Canal and G-310 pump station. The STA-1West Expansion # 1 is located in the west

central portion of Palm Beach County, and consists of a series of perimeter impoundment

embankments, canals and flow control structures. The U.S. Fish and Wildlife Service

Wildlife Conservation Area is located to the southeast of the STA; agricultural land is

located to the west. The stockpile soil is physically located in Township 44 South, Range

34, Section 34. A general site vicinity map illustrating the stockpile location in reference

to the STA-1West is included on Figure 1.

The soil stockpile is an estimated 378,640 cubic yards, approximately six acres in area, is

approximately 12 feet high, and covered with sparse vegetation. The stockpiled soils

originated from two areas: A portion of these soils were scraped from 2,000 acres within

the interior of the STA-1West Expansion area during construction of the STA-1West

Expansion Area # 1, and the remaining soils originated from interior roads in the STA-

1West Expansion Area # 1 that were degraded and re-located to the stockpile area. Soils

Robert Taylor

Soil Stockpile Sampling and Soil Management Plan

STA-1West Expansion # 1

March 26, 2020

of 9

in 2,000 acres of the central portion of the STA-1 West Expansion Area # 1, referred to as

the former Knight property exceeded the ecological risk screening levels for copper, and

organochlorine pesticides (OCPs), specifically chlordane, 4,4-DDE, and toxaphene, and

selenium.

Therefore soils in the stockpile have the potential to have elevated concentrations of

copper, OCPs, and other metals. According to the District, the degraded road-base

material was stockpiled in the western half of the stockpile.

This project is to evaluate the soil quality of the stockpiled soils, with respect to copper,

OCPs and select metals in order to identify potential ecological risks that may be present

in the event that the District re-uses these stockpiled soils. Based on correspondence

with the District and District subcontractors, there is no documentation of pesticides or

herbicides applied to the stockpile, therefore these agrochemicals were not tested for.

Also, based on the soil quality of the stockpiled soils, a Soil Management Plan (SMP) has

been formulated for the re-use of the soils within the STA-1West Expansion Area # 2.

2.0 OBJECTIVES

The objective is to evaluate the soil quality within the stockpiled soil area and evaluate

the viability of utilizing the stockpile soils as fill material in an area that will be inundated in

the STA-1West Expansion Area # 2.

3.0 RESULTS

In order to complete the above objective, AECOM completed the following tasks.

3.1Test Pits, Soil Sampling and Analysis

AECOM and Air, Water & Soil Engineering Inc. (AWSE), a District approved contractor

mobilized to the project area on January 22 and January 23, 2020 to collect soil samples

along the soil stockpile in STA-1 West. The soil stockpile was divided into 15 sections.

AWSE used a backhoe to excavate one trench in each section approximately 7 feet (ft.)

long by 3 ft. wide, with depths ranging from 5 ft. to 7 ft deep. Table 1 lists the global

Robert Taylor



March 26, 2020

of 9

positioning system locations and depths of the trenches. The soil stockpile consisted of

primarily black, organic material with some peat, gray clay, and crushed limestone.

Representative soils were collected from the base of each excavation using a stainless-

steel spoon and placed in a stainless-steel bowl. The soil was then thoroughly mixed with

the spoon to form a composite sample and containerized in two, 4-ounce glass jars. The

bowls and spoons were decontaminated per Florida Department of Environmental

Protection (FDEP) standard operating procedures after the collection of each sample.

These were submitted to Jupiter Environmental Laboratories, a licensed and District

approved laboratory located in Jupiter, Florida, and one split sample at SS-7 was

submitted to Eurofins Test America Tampa, a licensed laboratory in Florida. A duplicate

sample (DUP-1) was collected at SS-7 as well. These samples were analyzed for OCPs by

EPA Method 8081 and metals barium, chromium, copper, mercury, and selenium by EPA

Method 6020. The bowls and spoons were decontaminated per Florida Department of

Environmental Protection (FDEP) standard operating procedures after the collection of

each sample. Figure 2 illustrates the sample locations.

Results – Organochlorine Pesticides

Total chlordane (summation of alpha and gamma chlordane isomers) concentrations

were detected above the 18 micrograms per kilogram (ug/kg) Probable Effect

Concentrations (PEC) Sediment Quality Assessment Guidelines (SQAG) in soil samples

SS-1, SS-2, SS-4 through SS-7, DUP-1, SS-13, and SS-14, with a maximum

concentration of 302 micrograms per kilogram (µg/kg) in the duplicate soil sample DUP-

1 (SS-7 duplicate). Total chlordane concentrations were above the Threshold Effects

Concentrations (TEC) SQAG in the soil samples SS-3, SS-11, SS-12, and SS-15. It should

be noted that none of the soil samples exhibited total chlordane above the Professional

Services Inc. (PSI) 2014 Screening Level Ecological Risk Assessment (SLERA) site

specific cleanup target level of 820 ug/kg. Total chlordane detected in the soil samples

SS-1 through SS-7, SS-11 through SS-15 were above the Leachability Based on Surface

Water Criterial Surface Water Criteria (LSW) Soil Cleanup Target Level (SCTL) of 3 ug/kg.

The concentration of 4,4’-DDE was detected above the SQAG PEC standard in the split

sample in soil sample SS-7, with a concentration of 47 µg/kg. The 4,4’-DDE

concentrations were above the TEC standard in soil samples SS-1, SS-7, and DUP-1 (SS-

7 duplicate). The 4,4-DDE detected in the soil sample SS-7(split) was above the LSW

Robert Taylor



March 26, 2020

of 9

SCTL of 40 ug/kg. None of the soil samples exhibited 4-4’DDE above the PSI 2015

Expanded Ecological Risk Assessment (EERA) site specific cleanup target level of 1.6

mg/kg.

The concentration of 4,4’-DDD was above the SQAG TEC standard for the sample

collected in soil sample SS-1, with a concentration of 6.72 µg/kg. The dieldrin

concentrations detected in soil samples SS-7 and DUP-1 (SS-7) were above the TEC and

LSW SCTL at concentrations of 12.3 ug/kg and 14.1 ug/kg, respectively. The dieldrin

concentrations in the remaining soil samples were below the laboratory method

detection limit (MDL), however, the MDL exceeded the LSW SCTL of 0.1 ug/kg. The

concentrations of 4,4’-DDD and dieldrin detected in the soil samples were below the PSI

2014 SLERA site specific cleanup target levels of 8.9 ug/kg and 950 ug/kg, respectively.

The total toxaphene concentration was above the PEC standard of 32 ug/kg in soil sample

SS-5, with a concentration of 708 µg/kg. The total toxaphene concentrations in the

remaining soil samples were below the MDL; however, the MDL exceeds the LSW SCTL

of 3 ug/kg. The MDL for total toxaphene was above the PEC standard in the split soil

sample SS-7 and above the TEC standard for all other samples collected. None of the

soil samples exhibited total toxaphene above the PSI 2015 EERA site specific cleanup

target level of 4.7mg/kg.

Results – Metals

Barium concentrations were above the PEC standard in all soil samples except for soil

sample SS-8, with a maximum concentration of 130 mg/kg at SS-12. The barium

concentration was above the TEC standard in the sample collected at SS-8. The barium

concentrations exceeded the LSW SCTL of 0.4 mg/kg in the 15 soil samples.

Copper concentrations were above the TEC standard at SS-1 through SS-7, SS-11, SS-

13, SS-14 and SS-15, but below the 150 mg/kg benchmark for muck soils with a maximum

concentration of 120 mg/kg in soil sample SS-4.

One soil sample, SS-7(split) exhibited mercury above the LSW SCTL of 0.01 mg/kg. The

other samples were below the MDL; however, the MDL exceeds the LSW SCTL and TEC.

Robert Taylor



March 26, 2020

of 9

A selenium concentration was detected above the TEC standard in the split soil sample

SS-7 (split) sample, with a concentration of 2.1 mg/kg. The other samples were either

less than 2 mg/kg, or MDL, however, the MDL exceeds the LSW SCTL of 0.5 mg/kg.

Synthetic precipitation leaching procedure (SPLP) was performed on soil samples SS-9,

for selenium. This sample had the highest detected selenium in the sections targeted to

be relocation. Soil samples SS-11, and SS-12 were also analyzed by SPLP for barium

chromium, and copper. These two samples had the highest detected concentrations of

barium, chromium and copper in the sections targeted for relocation. The results of the

SPLP testing indicated that soils with these metals would not leach into the groundwater

nor surface water at concentrations that would exceed groundwater and surface water

cleanup target levels.

Figure 3 illustrates the OCP concentrations, Figure 4 illustrates the metal concentrations

and Figure 5 illustrates the TEC and PEC exceedances. Table 2 summarizes the soil

analytical results. Table 3 summarizes the SPLP results.

3.2 Soil Management Plan (SMP)

As part of the STA-1 West Expansion # 2, an estimated 102,000 cubic yards of fill are

required to raise an area in Cell 10 approximately two feet from 7 feet NAVD to 9 feet

NAVD. The area to be raised is approximately 5.5 miles south of the soil stockpile. Figure

6 illustrates the proposed area to be raised with respect to the soil stockpile. Based on

the recent stockpile soil sample results AECOM recommends using the stockpiled soil

from Sections 8, 9, 10, 11, and 12, to use in Cell 10. Soils in these five sections have either

low or non-detectable concentrations of OCPs, specifically total chlordane. However,

elevated levels of barium, above the TEC and PEC are present. An estimated 130,612

cubic yards of stockpile soils are available to be relocated from these five sections. Table

4 lists the estimated cubic yards in these sections.

Based on the recent sampling elevated barium concentrations ranging from 51 mg/kg to

130 mg/kg are present in these five sections, with an average concentration of 85 mg/kg.

The average barium concentration is within the range of background barium

concentrations in Florida soils of 1.67 mg/kg and 112 mg/kg, as report by Chen et. Al

(1999) indicating the barium concentrations in the stockpiled soils are representative of

background concentrations. In addition, 111 samples from remote freshwater systems

throughout Florida were collected to determine background metal concentration levels in

2002 by Carvalho and Schropp. Barium concentrations ranged from 2.3 to 420 mg/kg,

Robert Taylor



March 26, 2020

of 9

suggesting the barium concentrations detected in the soil stockpile in STA-1 West are

unlikely to be associated with risk to aquatic organisms.

AECOM has contracted Formation Environmental to research sediment toxicity data for

barium in fresh water and has not, to date, identified any studies that directly show toxicity

of barium in freshwater sediment to benthic macroinvertebrates. Since no other barium

sediment benchmarks are available, the SQAGs should be considered as an initial

screening level as discussed in the District’s Sediment Quality Benchmark (SQB)

guidance (Formation 2019). These benchmarks should be considered as highly

conservative and remedial actions should not be based on the use of the benchmarks as

a main source of evidence supporting the potential for risk due to barium toxicity.

Barium in the environment is generally highly insoluble, existing as either barite (barium

sulfate) or witherite (barium carbonate), both of which are highly insoluble and

subsequently have very low bioavailability. Review of the SQAG guidance document

provides no information regarding the derivation of the TEC and PEC benchmarks for

barium. The barium SQAGs are not representative of the typical consensus-based

benchmarks provided for most of the metal contaminants in the SQAG guidance and no

discussion regarding the assumptions behind the benchmarks is provided. A review of

the referenced source for the benchmarks indicates that the author of the SQAG

guidance obtained the benchmarks from a secondary source in a draft document (SAIC

1991). The Washington State Sediment Quality Guidelines (WADOE 1997) reviewed the

source of the SQAGs and indicated that the benchmarks cited in the USEPA (1977)

guidance were developed by USEPA Region V in order to classify Great Lakes harbor

sediments. The document notes that the values are “‘somewhat arbitrary and are not well

founded scientifically” and that they were only adequate for ‘determining the suitability of

dredged material for open water disposal.’ The barium benchmarks appear to be based

not on benthic toxicity but on a general ‘contamination classification’ scheme. As a result,

the use of the USEPA (1977) benchmark to predict risk from barium is highly uncertain.

Recent toxicity testing indicating that barium concentrations detected in soil samples do

not present a risk to ecological receptors is further supported by the Expanded Ecological

Risk Assessments (EERAs) conducted by the District in the vicinity of the STA-1 West

Expansion Area # 1 project area:

Robert Taylor



March 26, 2020

of 9

• Subchronic toxicity testing was conducted using bulk muck soil samples collected

from the U.S. Sugar Corporation Properties which contained barium, 4,4’-DDD, 4,4’-DDE,

4,4’-DDT, chlordane, and/or Toxaphene at concentrations exceeding their SQAG-PECs

(Newfields, 2008). Toxicity was not observed in six samples containing barium at

concentrations ranging from 40 to 142 mg/kg. Toxicity was noted in four samples

containing barium at concentrations ranging from 105 to 152 mg/kg but those samples

also had at least one organochlorine pesticide at a concentration greater than 10 times

its PEC.

• Subchronic and chronic toxicity (42 days and life cycle, respectively) testing using

H. azteca and C. tentans was conducted using bulk soil samples collected immediately

south of the STA-1 West Expansion # 1Area, from the proposed STA 1-West Expansion

Area #2 (Formation, 2020). Bulk muck soil samples contained barium at concentration

ranging from 87 to 140 mg/kg and concentrations exceeded the PEC in all samples

collected at the Site. The soils at the Site also contained copper, chlordane, and 4,4’-DDE

at concentrations exceeding their SQAG-TECs or SQAG-PECs. Sediment samples were

also collected and analyzed for Simultaneously Extract Metals (SEM) and Acid Volatile

Sulfides (AVS). In the STA 1-West Expansion Area #2 samples, all SEM/AVS samples

contained adequate AVS to bind the SEM and the report concluded that the risks to

macroinvertebrates from copper and barium were low. Based on those data, the effects

observed versus field reference samples in samples containing were due to elevated

concentrations in of OCPs and not the copper or barium.

The effect of TOC which inhibits the bioavailability of divalent metals and OCPs has been

widely demonstrated and the results of the above District studies correlate well with the

existing scientific data.

Based on the likelihood of the barium concentrations observed in the stockpiled soils

being within the range of natural background, a lack of a consensus-based barium

SQAGs, the results of the District toxicity tests in muck soils, and the large amount of TOC

in the Site soils, the guidelines should be considered an initial screening level and all

potential risk-based lines-of-evidence should be considered as part of the assessment

of sediment risk from barium.

Considering that barium concentrations detected in soil samples collected from the

stockpiled soils were within the range of concentrations established for healthy biological

communities and results for subchronic and chronic toxicity tests using comparable soils

Robert Taylor



March 26, 2020

of 9

have not suggested toxic effects to benthic invertebrates due to elevated barium

concentrations, exposure of ecological receptors is not expected to be associated with

significant risks.

In addition, the stockpiled soils, scraped from STA-1West Expansion Area # 1, targeted

to be re-used in the STA-West Expansion Area #2 where the aforenoted EERA was

conducted are similar in nature - organic rich muck, and had similar type of agricultural

use – vegetable and sugarcane.

Summary

Based on the soil analytical analysis soils in sections 8 through 12 are being consider for

soil relocation to raise the area in the STA 1 W Expansion Area # 2. The laboratory analysis

indicated that samples from these locations exhibited barium above the PEC SQAG . Soils

in the remaining sections, based on the elevated concentrations residual agrochemicals

are not being proposed for relocation to areas that may be potential inundated.

Prior to relocating the soils from Grids 8 through 12, additional soil sampling is

recommended to confirm the results of this sampling. AECOM does not anticipate

unacceptable risk associated with barium, as barium concentrations detected were

similar to concentrations used in the toxicity studies, barium’s low bioavailability, and

concentrations were within the range of naturally occurring barium in Florida .

The proposed toxicity tests will consist of subchronic toxicity test using the 10-day

method for H. azteca and C. tentans using EPA Method 100.1 and EPA Method 100.2,

respectively. Chronic toxicity to H. Azteca will be evaluated using a 42-day bioassay using

Method 100.4. Chronic toxicity to C.tentan will be evaluated using a life cycle test per

Method 100.5A life cycle test.

Additional soil samples should be collected from sections 8 through 12 and submitted for

laboratory analysis of OCPs, barium, and selenium to confirm that initial soil sample results

to ensure that the stockpiled soils targeted for relocation do not have elevated

concentrations of the constituents previously detected. Soils should also be analyzed for

iron and aluminum to allow use of the FDEP Metals Interpretive Tool for Assessment of

FIGURES

STA1W-Expansion #1

Project Boundary

SOIL STOCK PILE

FIGURE:

1

SITE VICINITY MAPSTA1W - EXPANSION #1

South of County Road 880


SS-15

SS-14

SS-13

SS-12

SS-11

SS-5

SS-6

SS-10

SS-7

SS-9

SS-8

SS-3

SS-4

Proposed Concrete Lined Connection Canal

SS-1

SS-2

FIGURE:

2

STOCKPILE AREA

SAMPLE LOCATIONS

STA1W - EXPANSION #1



SS-15

SS-14

SS-13

SS-12

SS-11

SS-5

SS-6

SS-10

SS-7

SS-9

SS-8

SS-3

SS-4


SS-1

SS-2

FIGURE:

3

STOCKPILE AREA

SOIL ANALYTICAL MAP

PESTICIDES




2.8 U

3.2

LEGEND:

Bold

14.7

8.61

18.6

12.3

20.4

14.1

7.43

14.9

6.72

13.4

- Soil Sample Location

- Section exceeds one or more PECs

(either Pesticides or Metals)

BDL- Below Laboratory Detection Limit

U - indicates that the compound was analyzed

for but not detected above the listed value

I - The reported value is between the

laboratory method detection limits (MDL) and the

laboratory practical quantitation limit (PQL).

- exceeds Leachability based on

groundwater criteria

- shaded exceeds the TEC SQAG

- shaded exceeds the PEC SQAG

Organochlorine results are expressed in

micrograms per Kilogram (ug/Kg)

Samples SS-1 through SS-5 and SS-11 through SS-15

were collected on 1-22-2020

Samples SS-6 through SS-10 were collected on 1-23-2020

SS-15

SS-14

SS-13

SS-12

SS-11

SS-5

SS-6

SS-10

SS-7

SS-9

SS-8

SS-3

SS-4


SS-1

SS-2

FIGURE:

4

STOCKPILE AREA

SOIL ANALYTICAL MAP

METALS





U - indicates that the compound was analyzed

for but not detected above the listed value

I - The reported value is between the laboratory

method detection limits (MDL) and the

laboratory practical quantitation limit (PQL).

A - STA-1 West Site Specific Expanded Ecological

Risk Assessment Value

B - Formation Environmental LLC C-9 and C-11

Selenium Bioaccumulation Study and Expanded

Ecological Risk Assessment dated June 2012

Selenium Value





Results are expressed in milligrams

per Kilogram (mg/Kg)

Samples SS-1 through SS-5 and SS-11 through

SS-15 were collected on 1-22-2020

Samples SS-6 through SS-10 were collected on

1-23-2020

2.8 U

3.2

Bold

LEGEND:

66

120

80

79

65 73 85 J3

2.1

73

91

51

60

77

110

52

SS-15

SS-14

SS-13

SS-12

SS-11

SS-5

SS-6

SS-10

SS-7

SS-9

SS-8

SS-3

SS-4


SS-1

SS-2

FIGURE:

5

STOCKPILE AREA

SOIL ANALYTICAL MAP

TEC AND PEC EXCEEDANCES




2.8 U

3.2

LEGEND:

Bold


- Section exceeds one or more PECs

(either Pesticides or Metals)

J3 - Estimated Value





Metal results are expressed in

milligrams per Kilogram (mg/Kg)

Samples SS-1 through SS-5 and SS-11 through

SS-15 were collected on 1-22-2020

Samples SS-6 through SS-10 were collected on

1-23-2020

23.3

85

73

6.72

13.4

7.43

99

91

SS-6

SS-10

SS-7

SS-9

SS-8

53.5

120

134

708

100

80

81

100

79

268

81

65

18.6

12.3

302

91

20.4

14.1

73

85 J3

51 J3

2.1

51

78

77

89

60

130

100

77

93

110

96

52

96

52

Constituent

Concentration

8.51

50.8

120

66

14.9

14.7

120

SOIL RELOCATION AREA

SOIL STOCK PILE

FIGURE:

6SOIL RELOCATION MAP




TABLES

Location LATITUDE LONGITUDE COMMENTS

SS-1 26.59780 -80.44775

SS-2 26.59706 -80.44804

SS-3 26.59630 -80.44815

SS-4 26.59570 -80.44805

SS-5 26.59521 -80.44812

SS-6 26.59465 -80.44846

SS-7 26.59380 -80.44895

Duplicate and split sample collected

SS-8 26.59251 -80.44941

SS-9 26.59312 -80.44948

SS-10 26.59453 -80.44947

SS-11 26.59533 -80.44925

SS-12 26.59581 -80.44925

SS-13 26.59645 -80.44897

SS-14 26.59700 -80.44862

SS-15 26.59767 -80.44841

Notes:- Coordinates were collected in Latitude/Longitude in decimal degrees using North American Datum (NAD) 83

- Soil samples were collected from base of trench and composited in a stainless steel bowl.

AECOM Job # 60616094

TABLE 1Soil Sample Locations

STA- 1 West Soil Stockpile


1 of 1

Table 2

Soil Analytical Results

STA 1 West Soil Stockpile

Everglades Agricultural Area, Palm Beach County, Florida


1/22/2020 1/22/2020 1/22/2020 1/22/2020 1/22/2020 1/23/2020 1/23/2020 1/23/2020 1/23/2020

Laboratory Analyses TEC1

PEC1

SCTL_Res2

SCTL_Ind3

SCTL_Leach4

SCTL_Leach5 SS-1 SS-2 SS-3 SS-4 SS-5 SS-6 SS-7 DUP-1 (SS-7) SS-7 (split)

Organochlorine Pesticides by EPA Method 8081A/8081B (µg/kg)

4,4'-DDD 4.9 28 4,200 22,000 5,800 10 6.72 0.256 U 0.424 U 0.310 U 0.323 U 0.207 U 0.268 U 0.303 U 0.96 U

4,4'-DDE 3.2 31 2,900 15,000 18,000 40 13.4 0.276 U 0.456 U 0.334 U 0.348 U 2.51 18.6 20.4 47

Dieldrin 1.9 62 60 300 2 0.1 0.215 U 0.268 U 0.443 U 0.325 U 0.338 U 0.217 U 12.3 14.1 1.1 U

Total Chlordane (a+g) 3.2 18 2,800 14,000 9,600 3 50.8 23.3 7.43 53.5 134 81 268 302 14 U

Total Toxaphene 0.10 32 900 4,500 31,000 2 8.05 U 10.0 U 16.6 U 12.2 U 708 8.14 U 10.5 U 11.9 U 53 UOther EPA 8081B Constituents NA NA NA NA NA NA BDL BDL BDL BDL BDL BDL BDL BDL BDL

Metals by 6020B (mg/kg)

Barium 20 60 120 130,000 1,600 0.4 120 85 99 120 100 100 81 91 85 J3

Chromium 43 110 210 470 38 4.2 8.8 9 6.6 9.1 8 6.6 7.4 7 6.5

Copper 32 85A / 150

B 150 89,000 * * 66 73 91 120 80 79 65 73 51 J3

Mercury 0.18 1.1 3 17 2.1 0.01 0.20 U 0.26 U 0.43 U 0.30 U 0.31 U 0.20 U 0.28 U 0.31 U 0.082 I

Selenium 2A

4.2C 440 11,000 5.2 0.5 0.75 U 1.4 I 1.6 U 1.1 U 1.2 I 0.77 U 1.2 I 1.2 U 2.1

Notes:mg/Kg - milligrams per Kilogram

µg/Kg - micrograms per Kilogram1 Development and Evaluation of Numerical Sediment Quality Assessment Guidelines (SQAGs) for Florida Inland Waters, Table 5.1 (MacDonald et al 2003)

3 FAC Chapter 62-777, Table 2-Technical Background Document, Direct Exposure

Commercial/Industrial SCTLs

4 FAC Chapter 62-777, Table 2-Technical Background Document, Leachability Based

on Groundwater Criteria Soil Cleanup Target Levels SCTLs

5 FAC Chapter 62-777, Table 2-Technical Background Document, Leachability Based on Surface Water Criteria Soil Cleanup Target Levels SCTLs

TEC = Threshold Effect Concentration

PEC = Probable Effect Concentration

NA - Not Applicable

BDL= Below Laboratory Detection Limit

U - indicates that the compound was analyzed for but not detected above the listed value

I - The reported value is between the laboratory method detection limits (MDL) and

the laboratory practical quantitation limit (PQL).

J3 - estimated valueA - U. S. Fish and Wildlife Service Interim Value

B - STA-1 West site-specific Expanded Ecological Risk Assessment Copper Value of 150 mg/Kg

C - Formation Environmental, LLC C-9 and C-11 Selenium Bioaccumulation Study and Expanded

Ecological Risk Assessment dated June 2012 - Selenium Value

* Leachability values may be derived using SPLP Test to calculate site-specific SCTLs.

Italicized - analytical result exceeds the Freshwater Leachability SCTL

BOLD - analytical result exceeds Leachability Based on Groundwater Criteria

Shaded - analytical result exceeds the TEC SQAG

Shaded - analytical result exceeds the PEC SQAG

2 FAC Chapter 62-777, Table 2-Technical Background Document, Direct Exposure Residential Soil Cleanup Target Levels (SCTLs)

GUIDANCE CONCENTRATIONS

SAMPLE IDENTIFICATION

1 of 2


Laboratory AnalysisTEC

1

(mg/Kg)

PEC1

(mg/Kg)

SCTL2

(mg/Kg)

SCTL3

(mg/Kg)

SCTL4

(mg/Kg)

GCTL 5, 6

(µg/L)

SWCTL7

(µg/L)

SPLP

mg/l

SPLP

mg/l

SPLP

mg/l

Metals - EPA Method 6010B (mg/Kg)

Barium 20 60 120 1,600 0.4 2,000 5 ND 78 NA 89 0.026 130 0.053

Chromium 43 110 210 38 4.2 100 5

11 7 7 NA 7 0.0020i 9.9 0.0032i

Copper 32 85A / 150

B 150 * * 1000 6 3.7 21 NA 60.00 0.012 27 0.0064i

Selenium 2A 4.2

C 440 5.2 0.5 50 5

5 7 1.0I 0.0021U 0.74U NA 0.87 NA

Notes:

Soil Resutls expressed in milligrams per kilogram (mg/kg)1 Development and Evaluation of Numerical Sediment Quality Assessment Guidelines (SQAGs) for Florida Inland Waters, Table 5.1 (MacDonald et al. 2003)

2 Chapter 62-777, F.A.C., Table 2-Technical Background Document, Direct Exposure Residential Soil Cleanup Target Levels (SCTLs)

3 Chapter 62-777, F.A.C., Table 2-Technical Background Document, Soil Cleanup Target Levels (SCTLs), Leachability Based on Groundwater Criteria

4 Chapter 62-777, F.A.C., Table 2-Technical Background Document, SCTLs, Leachability Based on Freshwater Surface Water Criteria

5 Chapter 62-550, F.A.C., Table 1 - Primary Drinking Water Standards

6 Chapter 62-550, F.A.C., Table 6 - Secondary Drinking Water Standards

7 F.A.C., Chapter 62-302.530, Table I - Criteria for Surface Water Quality Classifications, Class III - Predominately Fresh Waters




A - U. S. Fish and Wildlife Service Interim Value


C - Formation Environmental, LLC C-9 and C-11 Selenium Bioaccumulation Study and Expanded Ecological Risk Assessment dated June 2012 - Selenium Value

Synthetic Precipitation Leaching Procedure (SPLP) results are expressed in micrograms per liter (µg/L)

BOLD - Sample analytical result exceeded the SWCTL

Shaded - analytical result exceeds the TEC SQAG or Service Interim Value


ND - Not developed for Class III Freshwater NA - Not analyized

GUIDANCE CONCENTRATIONS SS-9 SS-11 SS-12

TABLE 3

SUMMARY OF METAL SOIL ANALYTICAL RESULTS AND SPLP ANALYTICAL RESULTS

STA-1 West Soil Stockpile

PALM BEACH COUNTY, FLORIDA


Section Estimated Area (sq ft) Estimated Volume (cubic yard COMMENTS

SS-8 74,085.27 23,997.42

SS-9 70,272.08 23,699.70

SS-10 66,236.82 25,347.25

SS-11 80,119.10 31,223.38

SS-12 73,048.95 26,344.64

Total 363,762.22 130,612.39

TABLE 4Section Volumes




1 of 1

Table 2

Soil Analytical Results


Everglades Agricultural Area, Palm Beach County, Florida


Laboratory Analyses TEC1

PEC1

SCTL_Res2

SCTL_Ind3

SCTL_Leach4

SCTL_Leach5

Organochlorine Pesticides by EPA Method 8081A/8081B (µg/kg)

4,4'-DDD 4.9 28 4,200 22,000 5,800 10

4,4'-DDE 3.2 31 2,900 15,000 18,000 40

Dieldrin 1.9 62 60 300 2 0.1

Total Chlordane (a+g) 3.2 18 2,800 14,000 9,600 3

Total Toxaphene 0.10 32 900 4,500 31,000 2Other EPA 8081B Constituents NA NA NA NA NA NA

Metals by 6020B (mg/kg)

Barium 20 60 120 130,000 1,600 0.4

Chromium 43 110 210 470 38 4.2

Copper 32 85A / 150

B 150 89,000 * *

Mercury 0.18 1.1 3 17 2.1 0.01

Selenium 2A

4.2C 440 11,000 5.2 0.5

Notes:mg/Kg - milligrams per Kilogram

µg/Kg - micrograms per Kilogram1 Development and Evaluation of Numerical Sediment Quality Assessment Guidelines (SQAGs) for Florida Inland Waters, Table 5.1 (MacDonald et al 2003)

3 FAC Chapter 62-777, Table 2-Technical Background Document, Direct Exposure

Commercial/Industrial SCTLs

4 FAC Chapter 62-777, Table 2-Technical Background Document, Leachability Based

on Groundwater Criteria Soil Cleanup Target Levels SCTLs

5 FAC Chapter 62-777, Table 2-Technical Background Document, Leachability Based on Surface Water Criteria Soil Cleanup Target Levels SCTLs



NA - Not Applicable

BDL= Below Laboratory Detection Limit

U - indicates that the compound was analyzed for but not detected above the listed value

I - The reported value is between the laboratory method detection limits (MDL) and

the laboratory practical quantitation limit (PQL).

J3 - estimated valueA - U. S. Fish and Wildlife Service Interim Value


C - Formation Environmental, LLC C-9 and C-11 Selenium Bioaccumulation Study and Expanded

Ecological Risk Assessment dated June 2012 - Selenium Value


Italicized - analytical result exceeds the Freshwater Leachability SCTL

BOLD - analytical result exceeds Leachability Based on Groundwater Criteria

Shaded - analytical result exceeds the TEC SQAG

Shaded - analytical result exceeds the PEC SQAG

2 FAC Chapter 62-777, Table 2-Technical Background Document, Direct Exposure Residential Soil Cleanup Target Levels (SCTLs)

GUIDANCE CONCENTRATIONS 1/23/2020 1/23/2020 1/23/2020 1/22/2020 1/22/2020 1/22/2020 1/22/2020 1/22/2020

SS-8 SS-9 SS-10 SS-11 SS-12 SS-13 SS-14 SS-15

1.71 0.248 U 0.199 U 0.187 U 4.23 0.270 U 0.353 U 0.210 U

0.144 U 0.267 U 0.214 U 0.201 U 0.239 U 0.291 U 0.380 U 1.09 I

0.140 U 0.259 U 0.208 U 0.195 U 0.232 U 0.283 U 0.370 U 0.219 U

0.325 U 0.602 U 0.484 U 14.9 14.7 24.8 127 8.61

5.24 U 9.72 U 7.81 U 7.33 U 8.71 U 10.6 U 13.9 U 8.23 U

BDL BDL BDL BDL BDL BDL BDL BDL

51 78 77 89 130 100 93 96

6 7.4 5.9 7.3 9.9 7.9 8.1 7.5

10 21 16 60 27 77 110 52

0.18 U 0.24 U 0.20 U 0.19 U 0.23 U 0.27 U 0.35 U 0.21 U

0.70 U 1.0 I 0.78 U 0.74 U 0.87 U 1.0 U 1.3 U 0.81 U


2 of 2

march 26, 2020 lead environmental engineer land

Documents