in situ vapor extraction pilot study work …in-situ vapor extraction pilot study work plan remedial...

WARZYN

90

Final Report15340.12

In-Situ Vapor ExtractionPilot Study Work Plan

Remedial Design/Remedial ActionSource Control Operable Unit

Hagen Farm SiteTown of Dunkirk, Wisconsin

^ Prepared for:Waste Management of Wisconsin, Inc.

Westchester, Illinois

Prepared by:Warzyn Inc.

Madison, Wisconsin

January 1992

THE PERFECT BAIANCEBETWEEN TECHNOLOGY

AND CREATIVITY

MADISONONE SCIENCE COURT

PO BOX 5385MADISON, V(1 53~05

January 17,1992

Mr. Jae LeeRemedial Project ManagerRemedial and Enforcement Response Branch (5HS-11)U.S. Environmental Protection Agency230 South Dearborn StreetChicago. Illinois 60604

Re: Final In-Situ Vapor Extraction Pilot Study Work PlanHagen Farm RD/RATown of Dunkirk, Wisconsin

Dear Mr. Lee:

On behalf of Waste Management of Wisconsin Inc., enclosed are fivecopies of the Final In-Situ Vapor Extraction Pilot Study Work Plan forthe Hagen Farm Site Remedial Design/Remedial Action project.Responses to U.S. EPA and WDNR comments on the Draft In-situVapor Extraction Pilot Study Work Plan will be submitted shortly.

Please call if you have any questions regarding these documents.

Sincerely,

WARZYN INC.

Steven Termont-Schenk, P.E.Project Manager

STS/vlr/STS/GEA/SBH(mad-110-57b)15340.12

Enclosure: Final In-Situ Vapor Extraction Pilot Study Work Plan

cc: Mr. Jeffrey A Cahn - U.S. EPA (1 copy)Ms. Terry Evanson - WDNR (4 copies)Ms. Dee Brncich - WMWI (4 copies)Mr. Timothy Wright - The Jesup Group (1 copy)

FAX (608)2-3-2513

In-Situ Vapor ExtractionPilot Study Work Plan

Remedial Design/Remedial ActionSource Control Operable Unit

Hagen Farm SiteTown of Dunkirk, Wisconsin

January 1992

TABLE OF CONTENTS

1. INTRODUCTION....................................................................................................... 1-1

2. SCOPE OF WORK .................................................................................................... 2-1Pilot Study Protocol............................................................................................... 2-5

Optimization of Vacuum Pressure and Air Flow Rate ........................... 2-6Operation in Area of Less ConcentratedIndustrial Waste Burial ................................................................................. 2-8Screened Interval Effects................................................................................ 2-9Multiple Well Operation...'.............................................................................. 2-9Extended System Operation........................................................................... 2-10Pulsed System Operation ................................................................................ 2-11

Sampling Protocol................................................................................................... 2-11Air Flow Rates .................................................................................................. 2-11Exhaust Gas Measurements .......................................,..................:................ 2-11Chemical Sampling..........................................................................:................ 2-14Geotechnical & Biological Treatability Sampling ..................................... 2-15

ISVE Pilot Study Report ...................................................................................... 2-15Schedule/Milestones .............................................................................................. 2-16

3. CONCEPTUAL DESIGN ......................................................................................... 3-1Background............................................................................................................... 3-1Design Approach..................................................................................................... 3-2System Start-Up ...................................................................................................... 3-4Air Treatment.......................................................................................................... 3-4Conclusions............................................................................................................... 3-5

4. REFERENCES............................................................................................................. 4-1

FIGURES

Figure 1 - Proposed Vapor Extraction Well and Monitoring Probe LocationsFigure 2 - Typical Vapor Extraction Test WellFigure 3 - Typical Monitoring Probe NestFigure 4 - Conceptual Full-Scale Vapor Extraction System

lmad-602-21z]

SECTION 1INTRODUCTION

This document presents the in-situ vapor extraction (ISVE) Pilot Study Work Plan thatwill be implemented as part of the Remedial Design/Remedial Action (RD/RA)

. activities for the contaminant source at the Hagen Farm Site (Site). ISVE has beenspecified as part of the Source Control Operable Unit Record of Decision (ROD)issued by the United States Environmental Protection Agency (U.S. EPA) for the Site.The approved June 1991 RD/RA Work Plan (RD/RA Work Plan) specifies the tasksto be completed in order to comply with the ROD. Conducting an ISVE pilot study atthe Site (RD Task 5) is discussed in Section 3.0 of the RD/RA Work Plan. Resultsfrom the pilot study will be used to evaluate the potential effectiveness of a full-scaleISVE system as a method of volatile organic compound (VOC) source removal. Thedata will also be used to design the full-scale ISVE system as needed for sourcecontrol.

\The portion of the Site previously designated as "Area A" in the RemedialInvestigation (RI) Report is referenced as the "capped landfill" for purposes of theISVE Pilot Study Work Plan.

The ISVE pilot study will be concentrated within the southern portion of the cappedlandfill based on data collected during the RI (Figure 1). Data collected duringgroundwater and test pit sampling indicates that the co-disposal of industrial liquid andsludge with municipal refuse was concentrated within the southeastern portion of thecapped landfill (refer to Sections 5.3.4, .5.3.5, 5.3.6, 5.3.7, and 9.0 of the RI).Tetrahydrofuran (THF) and methyl ethyl ketone (MEK), the primary VOCs detectedin, and downgradient of, former source characterization wells SCW3 and SCW4, areindicative of industrial rather than municipal waste disposal. The concentrations ofTHF and MEK detected in source characterization wells SCW3 and SCW4 were anorder-of-magnitude or more higher than levels detected in wells located throughoutthe southwestern and northern portions of the capped landfill. Source characterizationwells SCW3 and SCW4 were properly abandoned during landfill cap constructionactivities.

~ . Pilot Study Work PlanHagen Farm RD/RA

January 17,1992Page 1-2

Based upon the preceding information, the pilot study and potential full-scaleinstallation has been proposed to target the southeastern portion of the cappedlandfill where the co-disposal of industrial waste is believed to have been concentrated.The full-scale ISVE system may be expanded to include the southwestern and northernportions of the capped landfill if the pilot study results indicate that effective VOCremoval, as described in Section 3, "Background", can also be achieved in the areas ofless concentrated industrial waste disposal. I

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Pilot Study Work PlanHagen Farm RD/RA


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SECI1ON2SCOPE OF WORK

The scope and duration of the pilot study required, to properly design a full-scale ISVEsystem for the specific conditions of contaminant distribution and concentrations, and.soils/slratigraphic characteristics at the Site need not be excessive. The pilot study willconsist of a series of tests, performed to obtain information required to optimize thedesign and operation of a full-scale system. The pilot study will aid in evaluating thefollowing:

• The optimum air flow rate necessary to maximize contaminant removal whileminimizing energy requirements;

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• The radius of influence of each individual recovery well;

• Contaminant removal rates in order to estimate requirements for a VOC airemissions permit, and if required, design of an air treatment system;

• The influence of buried waste and garbage on air flow paths and extractionwell radius of influence;

• The potential effectiveness of ISVE in treating source areas of lessconcentrated industrial waste disposal;

• The effect of varying extraction well flow rates, including cyclic shutdown ofwells, on contaminant removal rates and system energy requirements;

• The influence of ISVE on groundwater surface elevation, and its resultingimpact on the screening interval length available to uniformly influence theentire depth of the vadose zone; and

• The effect on refuse temperature from air intrusion into the landfill during thepilot test.

The pilot study will likely consist of four vapor extraction wells (EW1, EW1A, EW2,and EW3) and eight gas probe nests (GP1, GP2, GP3, GP4, GP5, GP6, GP7, andGP8). Extraction wells EW1, EWiA, and EW2 will be located within the southeasterncorner of the capped landfill (centered around former source characterization wellSCW4), which corresponds to the highest VOC groundwater concentrations andvolume of industrial waste burial (refer to Figure 1). Extraction well EW3 will belocated within the southwestern portion of the capped landfill in order to measure theVOC removal rate in an area of lower levels of groundwater contamination and less


January 17,1992- Page 2-2

concentrated industrial waste disposal. The gas probe nests, which are used tomeasure the pressure gradients caused by the induced air flow to the extraction well(s).will be located radially in two different directions from EWI and EWIA, and will benested approximately at 5-foot increments. The gas probe nests will be spaced atapproximately 10 ft, 45 ft, 90 ft, and 120 ft from extraction wells EWI and EWIA(Figure 1). Gas probe nests will be spaced at the specified intervals in order to directlymeasure or extrapolate the radius of influence. The effect of subsurface non-homogeneity on air flow paths and the radius of influence with depth due to buriedwaste and garbage presence can be determined through the use of monitoring nests,and their placement in two different radial directions from EWI and EWIA, theprimary pilot study extraction wells.

s,

The pilot study will be performed in two phases. The first phase will involve theinstallation of extraction wells EWI and EWIA, as well as the eight gas probe nests.Extraction wells EWI and EWIA will be operated both individually and incombination. Optimization and screened interval tests, as described in the "PilotStudy Protocol" subsection, will be conducted using extraction wells EWI and EWIAin order to select the air flow rate, well spacing, and screening interval to be used forthe remaining tests.

Installation of extraction wells EW2 and EW3 will follow initial operation and testingof extraction wells EWI and EWIA Extraction wells EW2 and EW3 will be spacedand screened at the optimum interval determined during the optimization andscreened interval tests using EWI and EWIA If the first phase pilot study resultsusing extraction wells EWI and EWIA show significant VOC removal can be achievedfrom both the fill zone and the subsurface soils by screening them separately, thesecond phase extraction wells will also be installed in a nested fashion (i.e., twoextraction wells will be installed in each location). The additional extraction wells willbe used to obtain data from other areas of the Site, and to run the multiple well,extended system operation, and pulsed system operation tests as described in the M"Pilot Study Protocol" subsection.

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Pilot Study Work Plan' Hagen Farm RD/RA


All wells and probes will be installed using a drill rig equipped with hollow stemaugers. The extraction wells will be 4 inches in diameter and the monitoring probes 1inch in diameter. Extraction well EW1 will be screened from approximately 3 ft intothe water table to 8 ft below, the top of the constructed cap, while the screeninginterval for extraction well EW1A will be from approximately 5 ft into the water tableto the fill zone/subwaste soils interface (approximately 5 ft above the water table). Theresults from the screened interval tests involving extraction wells EW1 and EW1A willbe used to determine the screening interval for extraction wells EW2 and EW3.Extraction wells EW1 or EW1A will be properly abandoned during the installation ofextraction wells EW2 and EW3 if a single screening interval is selected for theremainder of the tests and full-scale installation. The screening intervals for all of thepilot study extraction wells will extend into the water table to allow for additionalremoval of adsorbed VOCs from the saturated zone during future periods offluctuating groundwater levels, for monitoring groundwater levels, and for determiningthe influence of ISVE on the water table, as discussed later in this report. Thesefactors are important to optimize the removal efficiency of the extraction wells. Thegas probes will be nested at intervals of approximately 8 to 10.5 ft, 14 to 16.5 ft, and 20 .to 22.5 ft in order to monitor air flow gradients at different depths and zones of thecapped landfill (e.g., fill zone and subwaste soils). Typical extraction well and gasprobe nest construction details are presented in Figures 2 and 3, respectively.

Four subwaste soil samples and one composite aquifer matrix sample will be collectedduring the installation of the pilot study extraction wells and submitted for chemical,geotechnical, and biological treatability parameter analysis. Standard penetration testsubwaste soil samples using split-spoon samplers (i.e., ASTM D1586) will be collectedat 2.5-foot intervals from borings corresponding to the Installation of all extractionwells. One discrete sample will be collected per extraction well for chemical analysis.The interval sample will be determined in the field using a photoionization detector(FID). One composite sample per extraction well will be collected for geotechnicaland biological treatability analysis. The aquifer matrix sample to be analyzed forgeotechnical and biological treatability parameters will be composited from extraction


. January 17,1992Page 2-4

wells EW1 and EW1A. If PID screening indicates adsorbed VOC contamination mayexist in the aquifer matrix soils, a discrete aquifer matrix sample will be collectedduring the installation of extraction well EW1A for chemical analysis. Refer to the"Sampling Protocol" subsection for a discussion of analytical parameters and methods ~to be included as part of the chemical, geotechnical, and biological treatability *sampling program. The data will be used, if required, as a baseline for the _bioenhancement feasibility study, described in the RD/RA Work Plan (RD Task 7). |,,

It is not anticipated that either an air discharge permit or air treatment will be £required to perform the pilot study. The Wisconsin Department of Natural Resources'(WDNR) April 11, 1991, guideline for soil venting and air stripper systems and *corresponding air pollution regulations exempts systems emitting less than 5.7 pounds "*"'per hour total VOCs from air permit requirements, and systems emitting less than 9.0 Wpounds per hour from total VOC treatment requirements. Exhaust concentrationsduring the pilot study would have to exceed 3500 to 5200 parts per million (ppm) using ifan average air flow rate of 100 cubic feet per minute (cfm) and assuming an averagemolecular weight of 106 grams/mole (xylene) and 72 grams/mole (THF), respectively, »to exceed the air permit limitations. Exhaust concentrations are expected to be well "•below these levels based on soil gas data collected during the RI and past experience m.with ISVE systems. Exhaust gas measurements will be taken during the pilot study as Idescribed in the "Sampling Protocol" subsection. Carbon adsorption canisters will bekept on-Site as a contingency for use in the event applicable air emission levels areexceeded during the pilot study.

It is also not anticipated that applicable Wisconsin air toxics emission levels (NR 445)will be exceeded. The following is a listing of contaminants detected in groundwater fsamples collected at the Site which are regulated under NR 445 and theircorresponding emission levels above which air treatment would be required: T

Benzene: 300 pounds/year (Table 3, Group A) •Ethyl Benzene: 36 pounds/hour (Table 1, < 25-foot stack height) INaphthalene: 4.16 pounds/hour (Table 1, < 25-foot stack height)Tetrahydrofuran: 49 pounds/hour (Table 1, < 25-foot stack height) _Toluene: 31 pounds/hour (Table 1. < 25-foot stack height) |Vinyl Chloride: 300 pounds/year (Table 3, Group A)



Since allowable air emission levels are typically determined on a site specific basis, it isrequested that either the WDNR or U.S. EPA state its position in writing as part ofthe review and comment process for this submission as it relates to VOC-emissionsassociated with the Hagen Farm ISVE pilot study. This position statement shouldinclude the following: ,

• Concurrence that air treatment would not be required for the pilot study; or

• The circumstances, if any, that would require the inclusion of air treatment '(e.g. allowable VOC emission levels and required sampling intervals);

• The methodology for determining if allowable VOC emission levels have beenexceeded (e.g. single sampling event versus average concentration over time);and

• Actions that must be taken if allowable VOC emission levels are exceeded (e.g.discontinuation of the pilot study, inclusion of air treatment, reduction of airflow rate).

PILOT STUDY PROTOCOLThe ISVE pilot study will consist of a series of short-term tests (the longest test willrun about one to two weeks) designed to provide specific information required tofurther evaluate and design a full-scale system. Tests will be run using the variousextraction wells under varying air flow rates and well vacuum conditions. Specific testswill be performed to determine:

• Optimum vacuum pressures and air flow rates over the study area;

• Radius of influence of extraction wells under optimum operating conditions asdetermined above;

• Optimization of a multiple well configuration;

• The limitations of VOC diffusion recovery;

• Air treatment requirements;

• Effects of screened interval lengths on VOC removal; and

• The magnitude of groundwater mounding that is induced by the operation ofthe vapor extraction system.



The specific tests to be performed during the pilot study are discussed individuallybelow. The tests are presented in sequential order according to when they would beperformed during the pilot study. Field observations and measurements may dictatethe need to modify the testing protocol and time frames presented in this section.These decisions will be made in the field during the performance of the pilot study andcommunicated accordingly. •

Temperature of the refuse will be monitored during all tests when a vacuum is appliedto the landfill. If the refuse temperature increases significantly, due to aerobicbiodegradation resulting from air intrusion, the design parameters (air flow rate,vacuum pressure, screening interval, etc.) will need to be re-evaluated beforeproceeding with the pilot study. Significant increases in refuse temperature are notanticipated as methane production, an indication of anaerobic degradation, has notbeen observed at the Site. This may infer that insufficient materials or conditions existin the landfill which would be readily subject to biological degradation. Enhancedbiological degradation of the refuse materials may occur, however, upon inducement ofaerobic conditions during operation of the ISVE system. .

Optimization of Vacuum Pressure and Air Flow RateOne or two day tests, as dictated by field conditions and results, will be run usingextraction wells EW1 and EW1A, both separately and in combination, to determine anoptimum vacuum pressure, air flow rate, and screening interval to be used for theremainder of the pilot study and design of the full-scale ISVE system. The air flowrate will be varied between 20 and 120 cubic feet per minute (cfm). ApproximateVOC removal rates will be monitored as the flow rate is varied using aphotoionization detector (FID) and colorimetric tubes calibrated for the principle Sitecontaminants. A representative number of samples will be collected for laboratoryanalysis in order to calibrate results obtained using colorimetric tube screeningtechniques against analytical results. Submitting samples for laboratory analysis willalso more accurately quantify VOC removal rates throughout the duration of the pilotstudy (refer to "Sampling Protocol" subsection).



A baseline measurement of carbon dioxide, oxygen, and methane concentrations in the"J exhaust gas will be taken at system startup. Changes in concentrations of these

compounds during operation of the ISVE system will be used as an indicator of• enhanced biological activity. If VOC removal rates are high, and there is evidence of

significant enhanced biological activity during the pilot study, the work scope may need—• to be expanded to include a bioventing pilot study. An amended pilot study work plan

would be prepared and submitted to the U.S. EPA and the WDNR for approval at the..— completion of the pilot study activities outlined in this Work Plan prior to remobilizing-* to the field to conduct the bioventing pilot study. The bioventing pilot study would be

designed to reduce VOC emissions, and subsequent air treatment costs, by selecting aminimum air flow rate which still enhances in-situ biological degradation of VOCs.Data from the bioventing pilot study, if conducted, would be incorporated into thedesign of the full-scale ISVE system. A bioventing pilot study would not supersede thebioenhancement feasibility study outlined in the RD/RA Work Plan (RD Task 7).

VOC removal rates are not expected to exceed WDNR treatment requirements basedon the RI soil gas data, the high water solubilities of the primary ketone-contaminants-and THF, and the interference of landfill refuse materials with ISVE treatment. Thepresence of landfill refuse materials will likely limit the removal efficiency of the ISVEsystem by impeding the direct contact of air with source areas. The absorption ofliquids into the municipal refuse will also prevent direct air contact. VOC removal insource areas where direct contact with air is impeded would be limited because of theneed for vapor phase contaminants to migrate by slower diffusion mechanisms tosubsurface regions where air flow has not been impeded. Low air emissionconcentrations are likely because of the expected reliance on diffusion to achieve VOCremoval. The mass of remaining source area contaminants may also be relatively lowbecause of the high water solubilities of the ketones and THF, anjd the past leaching ofthese contaminants into groundwater. Maximized VOC removal will be the preferredapproach if any of the above-mentioned conditions exist at the Site. A bioventing pilotstudy would then be unnecessary.

The selection of a vacuum and air flow rate combination to complete the pilot studywill be based on optimizing VOC removal rates versus energy costs for operation (i.e.,the point at which exhaust is becoming diluted by clean air or the capacity of pilotstudy pump has been reached). Other factors such as the volume of entrained water inthe air stream (recovered in moisture knockout drum) may also influence the selection

Pilot Study Work Plan f ' " 'Hagen Farm RD/RA ft „

January 17, 1992 IPage 2-8 !

of an optimum vacuum and air flow rate. Entrained water generated during the pilot ~Tstudy will be pumped into the On-Site holding tank in the Site decontamination area, fand disposed of as a F039 RCRA listed hazardous waste (i.e., leachate generated from ™ ~Ta RCRA landfill).

Pressures at the gas probes will be measured using vacuum magnehelic gauges in order «to estimate vadose zone air permeability-values and extraction well radius of influence, Las well as predict air flow paths. The nested screening intervals and radial locations ofthe gas probe nests will allow for the measurement of the impacts of the buried waste Land garbage on air flow paths and radius of influence. Gas probe readings versusdistance can also be used to calibrate a three dimensional air flow model (i.e.,groundwater flow model modified for air flow) that may be used to locate and spaceextraction wells for the full-scale design. Because the landfill is capped, it is assumedat the present time that radial flow conditions will exist and three dimensionalmodeling will not be required. Air flow modeling for this Site may not prove feasiblebecause subsurface landfill refuse may interfere with air flow paths, and subsequentlyinfluence air permeability measurements.

Groundwater levels will be continuously measured in the extraction wells using apressure transducer with data logger system. Localized water table impacts will beevaluated by measuring initial and at least two subsequent groundwater levels fromnearby monitoring wells.

Similar tests will also be run at extraction wells EW2 and EW3 after their installation Lin order to monitor the effects of non-homogeneous contaminant, buried waste, andgarbage distribution on well vacuums, air flow paths, VOC removal rates, and radius of ^influence.

Operation in Area of Less Concentrated Industrial Waste BurialA one to two day test using extraction well EW3 will be run in order to measure VOC Tremoval rates in an area of less concentrated industrial waste burial. VOCs weredetected in groundwater samples collected from monitoring well SCW2, but at •*significantly lower concentrations than samples collected from SCW3 and SCW4. *Minimal VOC removal may be achievable from the southwestern and northern

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portions of the capped landfill which showed lower levels of VOCs in groundwater andsoil gas during the RI. The full-scale ISVE system will be limited to the southeasternportion of the capped landfill unless the pilot study shows that effective VOC removalis achievable from the other areas. Industrial waste burial appears to have beenconcentrated in the southeastern portion of the capped landfill.

Screened Interval EffectsResults from the testing of extraction wells EWI and EWIA will be used to evaluatethe effects of extraction well screening intervals on well vacuum, VOC removal rates,air flow paths, and radius of influence. Extraction well EWIA will be screened fromapproximately 5 ft into the water table to the fill zone/subwaste soils interface(approximately 5 ft above the water table). Screening at a lower interval couldenhance VOC removal if a significant amount of contamination has migrated down tothe water table and below the waste depth as expected. It is also possible that air flowthrough the buried waste and garbage could be improved by the increased verticalgradient that would result by screening extraction wells at a lower interval. Extractionwell EWIA, as well as EWI and EWIA in combination, will be run for -a one to two •day period. Groundwater levels will be continuously measured as previously describedsince the smaller screen interval could increase the magnitude of groundwatermounding. If groundwater mounding causes a significant loss of the screening interval,second phase extraction wells will only be installed down to a depth just abovegroundwater.

Multiple Well OperationExtraction wells EW2 and EW3 will be installed following completion and evaluationof the optimization and screened interval tests conducted at extraction wells EWI andEWIA. EW2 and EW3 will be spaced and screened based on radius of influence andoptimal screening interval data collected during the initial tests. Extraction wells EWI(or EWIA), EW2, and EW3 will be operated concurrently in order to provide dataneeded to design the full-scale ISVE system. The effects of multiple well operationdesign parameters, such as overall system pressure drop and the distribution of air flowand VOC removal, will be used to establish the design and operating requirements ofthe full-scale system. An estimation of overall system pressure drop is necessary to size

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Pilot Study Work Plan mHagen Farm RD/RA •

January 17,1992 •-Page 2-10

a vacuum pump which wih1 achieve the design vacuum and air flow rate at each of theextraction wells in the full-scale installation. Additional tests will be run using variouscombinations of the multiple extraction wells, if needed, to calibrate a threedimensional air flow model (i.e., groundwater flow model modified for air flow) thatmay be used to locate and space extraction wells for the full-scale design. Because thelandfill is capped, it is assumed at the present time that radial flow conditions will existand three dimensional modeling will not be required. Air flow modeling for this Sitemay not prove feasible because subsurface landfill refuse may interfere with air flowpaths, and subsequently influence air permeability measurements.

Extended System OperationExtraction wells EW1 (or EW1A), EW2, and EW3 will be allowed to continuously runfor approximately one to two weeks, depending on field conditions. Wellheadvacuum, pressure gradients, VOC removal rates, and enhanced biological activity willbe measured every two to three days in order to predict the impact of welldevelopment and VOC diffusion recovery rates on the long-term operation of thesystem. Upon the removal of three to four estimated pore volumes of ain thelimitations of VOC diffusion recovery rates on the long-term soil gas concentrationsand resulting removal rates will be evaluated. The time period for the removal of onepore volume of air will be estimated in the field using the following expressiondeveloped for radial flow (Johnson, P.C. et. al.):

t = (eTTR2H)/Q

where: e - air-filled void fractionR - radius of influenceH - thickness of zone of contaminationQ - air flow rate

If a significant reduction in VOC exhaust gas concentrations is not observed at the endof the time frame estimated for the removal of three to four air pore volumes, it willbe assumed that VOC diffusion recovery rates will not be a limiting factor during the _initial operation of the full-scale system. The removal of at least one air pore volume ftduring the extended system operation test, which is necessary to evaluate VOCdiffusion recovery rates, will be further supported by calculating air flow velocities and ft

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travel times using pilot study data during the preparation of the pilot study report.Groundwater levels will be continuously measured as previously described to provideadditional information on the influence of the vapor extraction system on localizedgroundwater levels.

Pulsed System Operation 'If a significant decrease in VOC removal concentrations is observed during the one. totwo week multiple well extended system operation test, the system will be shut downfor approximately two to three days at its completion in order to measure VOCdiffusion recovery. During this recovery period, the system will be restarted briefly atincreasing time intervals (2 hours, 4 hours, 1 day, etc) to obtain a VOC sample. Theresults of this test will be used to determine VOC diffusion recovery rates. Knowledgeof VOC diffusion recovery periods can be used to determine possible long-term VOCremoval rates, as well as evaluate any potential benefits and energy cost savings thatcould be realized by intermittent or pulsed operation of individual extraction wells.

SAMPLING PROTOCOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Air Flow RatesA variable speed positive displacement pump designed to operate at constant air flowrates will be used during the pilot study. The pump can be set to operate at constantair flow rates of 50, 75, 100, and 120 cfm, depending on the motor speed selected. Inorder to verify the pump air flow rate setting, air flow measurements will be taken atthe start-up of each test by installing a rotameter calibrated for air flow in the suctionline of the system. A rotameter will also be used if the pump is throttled in order toyield an air flow rate which varies from the above-mentioned settings.

Exhaust Gas MeasurementsAir samples for comparison with baseline measurements will be collected from asampling port located at the exhaust pipe on the discharge side of the pump. Sampleswill be collected using a 250 milliliter glass cylinder with stopcocks on the inlet andoutlet ports. A Sensidyne pump and selected colorimetric tubes will be used to draw asample from the glass cylinder and measure contaminant concentrations. Thesemeasurements will be used to estimate the overall soil gas composition, as well as



provide a method of comparing VOC removal rates for the various pilot study testsand design variables. At a minimum, samples will be collected for comparison withbaseline measurements at the beginning and before the end of each individual pilotstudy test, or as otherwise indicated in Section 2. Additional samples may be collectedon an as needed basis if additional data is required or as dictated by field observations.

Because numerous contaminants were detected at the Site and colorimetric tubes aretypically calibrated for a single compound, several colorimetric tubes will be used atthe beginning of the pilot study in order to initially estimate the overall soil gascomposition as a baseline for screening and comparison of VOC removalconcentrations for different design variables and parameters as the pilot studyprogresses. The use of colorimetric tubes will allow for numerous sampling events, aswell as immediate comparison in the field of the various design parameters in order toselect optimum air flow rates, etc. to be used for the duration of the pilot study. Thenumber and types of colorimetric tubes used for screening and comparison purposeswill be limited to a representative number of indicator compounds based on the initialmeasurements. The following colorimetric tubes and available concentration rangeswill be used to estimate the overall soil gas composition at the beginning of the pilotstudy:

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Compound

AcetoneBenzeneEthyl Ether (Toluene)Ethyl Ether (THF)Gasoline HydrocarbonsMethyl Ethyl Ketone4-Methyl PhenolPetroleum DistillatesTetrahydrofuranTolueneXyleneVinyl Chloride

Manufacturer'sConcentration Range

50-12,000 ppm or 0.01-2.0%2.5-120 ppm0.02-0.85%0.01-0.8%

30-1,000 ppm or 0.015-1.2%0.02-0.6%1-30 ppm

0.5-2.8 mg/120-800 ppm

1-100 ppm or 5-600 ppm10-500 ppm

0.1-8.8 ppm or 0.28-54 ppm

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where: ppm = parts per millionmg/1 = milligrams per liter

Notes:= 10,000 ppm1. ivc = iu,uuuppm

2. Conversion from ppm on z volume of contaminant per volume of air basis tomilligrams of contaminant per liter of air (mg/1) can be made using thefollowing expression t-Johnson, et. al.):

ppm = mg/1 x (.08211-atm/mol °K) x (298QK)MWxlO-o

where: l-liters atm-atmospheresm-mole oK-degree KelvinMW-molecuIar weight in milligrams per mole

In order to calibrate results obtained using colorimetric tube screening techniques, aswell as provide a more accurate overall compositional analysis for test comparison, airpermitting, and treatment design purposes, at least one sample will be collected duringeach pilot study test for laboratory analysis. Samples will also be collected forlaboratory analysis at the beginning of the optimization test (i.e., initial start-up) and atthe end of the one to two week extended operation test. Additional samples may becollected for laboratory analysis on an as needed basis if additional data is required oras dictated by field observations. Additional samples will be collected for laboratoryanalysis if a significant change in colorimetric tube indicator compound concentrationsis observed during the course of a particular pilot study test. Significant changes inexhaust gas concentrations can occur if non-homogeneous distribution of contaminantsor source areas exist in the subsurface (i.e., slugs of contaminants could reach theextraction well on a non-continuous basis).

A personal sampling pump with Tenex/Tenex-charcoal collection tubes will be used tocollect the samples from a sampling port located at the exhaust pipe on the dischargeside of the pump. The samples will be analyzed for Target Compound List (TCL)volatile organic compounds (VOCs), semi-volatile organic compounds (SVOCs), andtentatively identified compounds (TICs) using SW846 Methods 8240 and 8270(GC/MS).

Pilot Study Work Plan . 'Hagen Farm RD/RA •

January 17,1992 * "1Page 2-14

IDuring each sampling event, VOC levels will also be measured using a photoionization * ~]detector (PID). PID readings will be used as another method for screening and • 'comparing VOC removal rates for the various pilot study tests and design variables. • ""!They can also be used in conjunction with the colorimetric tube and analytical _ •sampling results, which are the control, to estimate total VOC concentrations for I --y.analysis of whether an air emission permit would be needed. I

I -A baseline measurement of carbon dioxide, methane, and oxygen will be taken at the |beginning of optimization test (i.e., initial start-up). Carbon dioxide concentrations will Ibe measured using either colorimetric tubes calibrated for carbon dioxide or aninfrared gas analyzer. Methane concentrations will be measured using either anorganic vapor analyzer (OVA) calibrated for methane or an infrared gas analyzer. ^Oxygen concentrations will be measured using either an explosimeter or other Vappropriate instrumentation. Measurements will also be taken during each VOCsampling event for all of the pilot study tests. If these indicators for enhanced Wbiological activity do not show any significant changes during the pilot study, they will \be used as a baseline for the comparison of future measurements taken during the full- m •-scale operation. * I"

f iChemical Sampling "I*Four discrete subwaste soil samples and possibly one discrete aquifer matrix soil i^sample will be submitted for chemical analysis. One discrete split-spoon sample will be Jcollected per extraction well installation for chemical analysis. The interval sample will £be determined in the field using a PID. If PID screening indicates adsorbed VOCcontamination may exist in the aquifer matrix soils, a discrete aquifer matrix .samplewill be collected during the installation of extraction well EW1A for chemical analysis.The samples will be analyzed for Target Compound List (TCL) VOCs, SVOCs, andTICs using SW846 Methods 8240 and 8270 (GC/MS). |

. Pilol Study Work PlanHagen Farm RD/RA


Geotechnical and Biological Treatability SamplingFour composite subwaste soil samples and one aquifer matrix sample will be collectedduring the installation of the pilot study extraction wells and submitted forgeotechnical and biological treatability parameter analysis. The soil samples will beanalyzed for the following parameters:

Parameter Analytical Method

Grain Size Analysis ASTMD422-90Percent Moisture ASTMD2216-90Total Organic Carbon Content ASTM D2974-87Permeability U.S. Army CorpsPorosity EstimatedNitrogen (Ammonia) E350.3Nitrogen (Total Kjeldahl) E351.3Nitrogen (Nitrate/Nitrite) E353.2Total Phosphorous E365.2Total Potassium SW846 Method 7610Bacterial Plate Count ' Conventional Plate Count

Method or Equivalent

ISVETILOT STUDY REPORT • - - -At the completion of the pilot study tests, an ISVE pilot study report will be preparedand submitted to the U.S. EPA and WDNR. The report will include:

• A summary of field installation methodologies, testing protocol, and relevantresults and findings; ,

• Analysis of the conceptual full-scale design approach (Section 3) and possibledeviations from this approach;

• Selected optimum well vacuum and air flow rate for use in scale-up of the finalISVE system design;

• Recommendations for extraction well spacing and screening interval to be usedin the final design using appropriate radial flow or three dimensional air flowmodels and VOC removal objectives based on pilot study results and aninferred VOC source area and mass;

• Estimate of air emissions and need for air treatment; and

• The rate of moisture removal requiring on-Site treatment.

A schedule for the design, construction, and start-up of the full-scalesystem will also be provided in the ISVE pilot study report.


January-17,1992Page 2-16

FSCHEDULE/MILESTONESThe schedule presented in the RD/RA Work Plan calls for theinstallation of the pilot study extraction wells and monitoring probes inFebruary 1992, following the completion of waste consolidation andlandfill cover construction activities. This is scheduled to occur while thecover soils are still frozen to minimize damage to the landfill cover. It isanticipated that well installation will be completed in two weeks. TheISVE pilot study will likely begin in March or April 1992, following thecompletion of well installation activities. Since the freezing of entrainedwater in hoses and other equipment inhibits the effective performance ofvapor extraction, the pilot study cannot begin until thawing conditionsoccur. It is anticipated that the pilot study tests will be completed overan eight week period. .

The schedule presented in the RD/RA Work Plan shows the submissionof a draft ISVE pilot study report following its completion. This reportwill be submitted within eight weeks of the completion of the pilot studywork scope.

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Pilot Study Work Plan• Hagen Farm RD/RA


SECTION 3CONCEPTUAL DESIGN

This section outlines the preliminary design approach for the full-scale ISVE system.The information contained in this section constitutes the 30% complete full-scale ISVEdesign specified in the RD/RA Work Plan. Implementation of this conceptual systemdepends on the results of the pilot-scale test. Results from this test will be used toverify this conceptual design approach. The design presented in this report may bemodified based on results of the pilot tests. Modifications may range from installingno additional wells (i.e., the pilot scale system would become the full-scale system) toexpanding the conceptual design (e.g., adding more wells as needed).

BACKGROUNDThe data summarized in the RI report suggests that the primary source areas ofindustrial waste burial and resulting VOC groundwater contamination are locatedthroughout the southeastern portion of the capped landfill (former Area A). Thehighest concentrations of THF, ketones, xylene, etc., were encountered around formersource characterization wells SCW3 and SCW4, and appear to be migratingdowngradient in groundwater to the south and southeast. The concentrations of VOCsdetected in monitoring wells located throughout the southwestern and northernportions of the capped landfill were an order-of-magnitude or more lower than thosefound in wells SCW3 and SCW4.

The conceptual design for the full-scale ISVE system is presented in Figure 4. Itassumes, for conceptual design purposes, that sufficient VOC removal will be achievedfrom Jhe southwestern portion of the capped landfill during the pilot study. The full-scale ISVE installation would be limited to the southeastern portion of the cappedlandfill if sufficient VOC removal is not realized from the southwestern portion. It isnot anticipated that vapor extraction would be performed throughout the remainder ofthe capped landfill unless the pilot study results from extraction well EW3 indicate thateffective VOC removal can also be achieved in other areas of less concentrated

!• industrial waste disposal. Extraction wells would be screened based on the pilot studyfindings. In the absence of significant groundwater mounding, the screening interval

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Pilot Study Work PlanHageii Farm RD/RA

January 17.1992Page 3-2

would extend into the water table to allow for additional removal of adsorbed VOCsfrom the saturated zone during periods of fluctuating groundwater levels.

VOC emissions from extraction well EW3 measured during the pilot study will be oneof the criteria used to evaluate potential VOC removal rates from the southwesternand northern portions of the capped landfill since it is located in an area of lessconcentrated industrial waste burial. Estimated treatment time frame cannot be usedto define effective treatment for this Site since the nature of the buried waste andgarbage do not allow for the quantification of VOC mass in the source areas. Instead,if the total VOC mass removal rate from extraction well EW3 exceeds a criteria ofapproximately 0.02 pounds per hour (approximately 25 gallons of liquid per year),consideration will be given to the expansion of the vapor extraction system to includethe southwestern and northern portions of the capped landfill. This assumes that theradius of influence of extraction well EW3 does not extend into areas of thesoutheastern portion of the capped landfill where more concentrated industrial waste Vburial occurred. The selected criteria is based on consideration of a reasonable VOC *removal rate, as well as past experience with vapor extraction capabilities. A •comparison of VOC removal rates from extraction wells EW3 versus EW1 and EW2, 1as well as VOC concentrations in groundwater measured during the RI, will also be _considered in the evaluation of expanding the vapor extraction system to include the 1southwestern and northern portions of the capped landfill. A pilot study test wouldlikely be run in the northern portion of the capped landfill prior to its inclusion in the §_full-scale installation.

[DESIGN APPROACHThe permeable nature of the subsurface soils and fill materials would typically yield a •radius of influence of 100 to 150 ft per extraction well based on past experience withISVE and landfill gas extraction systems. However, the presence of buried waste and Vgarbage is expected to interfere with air flow paths and result in a non-homogeneousgradient. In order to allow for maximum potential air contact, a grid system of eight 9extraction wells, spaced at 100-foot intervals, has been proposed as the most likely

Pilot Study Work FlanHagen Farm RD/RA


approach for the southern portion of the capped landfill. A ninth extraction well hasbeen located near former source characterization well SCW4 to allow the flexibility todirect the vapor extraction air flow paths more toward the highest areas ofgroundwater contamination, if necessary. If significant VOC removal can be achievedfrom both the fill zone and subsurface soils by screening them separately, the full-scaleextraction wells would be installed in a nested fashion (i.e., two extraction wells wouldbe installed in each location). Depending on the radius of influence and air flowgradients observed during the pilot study, individual wells could be operated eitherconcurrently or intermittently and well spacing may vary. Intermittent operation wouldperiodically alter the air flow paths and gradients, which would serve to maximize thepotential for air contact and subsequent diffusion of VOCs into the vapor, phase.Additional extraction wells, staggered at greater intervals, may be installed to cover theremainder of the capped landfill if the pilot study results indicate that effective VOCremoval can be achieved in these areas. Figure 4 presents the proposed conceptualdesign layout for the ISVE system.

Since the VOC concentrations in soil gas samples collected during the RI wererelatively low, operation at higher air flow rates would likely only result in the dilutionof the exhaust gas concentrations and would not increase the VOC removal rates. Anair flow rate of 50 cfm per operating extraction well has, therefore, been assumed forpurposes of the conceptual design. Using past experience, available vapor extractiondesign equations presented in U.S. EPA (February 1990), and an assumed airpermeability for sand and gravel soil conditions, a 50 cfm per well air flow rate wouldcorrespond to an operating well vacuum of approximately 25 inches of water. Theactual well vacuum requirements will be determined during the pilot study.

If it is assumed that a maximum of four extraction wells would be operatedconcurrently, a 200 cfm capacity positive development vacuum pump would berequired. A vacuum capacity of 68 to 95 inches of water (i.e., 5 to 7 inches ofmercury) is estimated to account for manifold pressure drop losses in order to providethe required well vacuums. A variable speed pump is recommended in order toprovide the necessary flexibility to vary the overall air flow rate as field conditions andVOC removal rates change with time. In order to avoid operational problems

Pilol Study Work PlanHagen Farm RD/RA


associated with the freezing of entrained water during winter operation, the majority ofextraction well headers and manifold piping would be situated underground below thefreeze line. Any portions of the system located above the freeze line would have to beinsulated and electrically heat traced.

SYSTEM START-UPBaseline concentrations of VOCs and indicator parameters of biological activity will bemeasured from each of the full-scale installation extraction wells and gas probes priorto start-up of the ISVE system. Periodic measurements will continue throughout theduration of the ISVE system operation. This data will be used to monitor remediationprogress and make any necessary future ISVE system adjustments or modifications. Afield gas chromatograph will likely be used to perform each round of VOCmeasurements. Changes in VOC concentrations and biological activity must bemonitored over a longer period of time (i.e., removal of numerous air pore volumes)than what is allowed by the pilot study tests in order to adequately evaluate theeffectiveness of the ISVE system and the stimulation of in-situ biological activity. Thelonger time frame is also necessary to evaluate the source of any enhanced biologicalactivity that may be observed (i.e.. landfill refuse could be the primary source ofbiological activity as opposed to the VOC source contaminants). The specification of avariable speed vacuum pump or multiple pumps with control valves will provide theflexibility to make future adjustments to air flow rates as the remediation progressesand VOC removal rates decrease, or if bioventing is determined to be a more costeffective approach to the completion of the remediation process.

AIR TREATMENTIt is not anticipated that either a permit or air treatment would be required for thefull-scale installation. Exhaust concentrations would have to exceed 1800 to 2600 ppmusing an average air flow rate of 200 cfm in order to exceed WDNR's total VOC limitof 5.7 pounds per hour for air permit requirements. Relevant NR445 air toxicemission levels are also not expected to be exceeded (refer to discussions presented inSection 2). Two to three carbon adsorption canisters could be operated in series if airtreatment is required.

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, . • Pilot Study Work Plan•-- . - . ' , '• f - - - - - : - <"• . ; - - Hagen Farm RD/RA

- . . , -. ' January 17,1992" V- ? l - • : : . . . ' " . . " " • . . " ' ' " ' ' ' ' . . ' - ' . . . ' . Page3-5

If the pilot study ISVE,data shows that effective VOC removal can be achieved fromless concentrated areas of industrial disposal, and that VOC air emissions from onlythe southeastern portion of the capped landfill require treatment, separate ISVEsystems can be installed (refer to Figure 4). The ISVE system operated on thesoutheastern portion of the capped landfill could be operated with air treatment andthe systems on the southwestern and/or northern portions without.

CONCLUSIONS ' v ' .Implementation of this conceptual system depends on the results of the pilot scale test.Results from this test will be used to verify this conceptual design approach, j Thisdesign may be modified based on results of the pilot test. Modifications may tangefrom installing no additional wells (i.e., the pilot scale system would become the full-scale system) to expanding the conceptual design (e.g., adding more wells as needed).

As stated in the RD/RA Work Plan, cleanup standard determination will.begin within90 days after the 2-year anniversary of the start of the full-scale ISVE system. At thistime, a model will be submitted to the agencies describing the relationship between soilgas concentrations and groundwater concentrations for each VOC detected in the soilgas and/or groundwater. The model will be used to determine the concentration ofVOCs in the waste and subwaste soils necessary to achieve the protective level ofVOCs in the groundwater. The model will incorporate data collected during the pilotscale test, the 2-year period of full-scale ISVE operation, and previous sampling andmonitoring activities performed at the Site. The purpose of the cleanup standarddeveloped for the ISVE system is to eliminate source area contaminant loading to theaquifer and assist in achieving the cleanup standards to be developed for groundwater.

If there is enough data to develop a model to determine cleanup standards prior to the2-year anniversary of the commencement of the full-scale ISVE system, then thisrequest will be made to the U.S. EPA. This request .will include pertinent data tosupport the decision to submit the model earlier.



SECTION 4REFERENCES

Johnson, P.C., Stanley, C.C., Kemblowski, M.W., Byers, D.L., and Colthart, J.D.. "APractical Approach to the Design, Operation, and Monitoring of In-Situ SoilVenting Systems", Groundwater Monitoring Review, Spring 1990, p. 159.

U.S. Environmental Protection Agency, Soil Vapor Extraction Technology, February1990.

U.S. Environmental Protection Agency, Superfund Remedial Design and RemedialAction Guidance, Office of Emergency and Remedial Action Guidance, Officeof Emergency and Remedial Response, OSWER Directive 93366.0-4A, June1986.

U.S. Environmental Protection Agency. 1990. Declaration for the Record ofDecision, Hagen Farm Site, WI, Source Control Operable Unit, September 17,1990.

Warzyn Engineering Inc., 1987. Site Evaluation Report, Hagen Farm Site, WarzynJob No. 13114.

Warzyn Engineering Inc., 1989a. Alternatives Array Document Source ControlOperable Unit, Remedial Investigation/Feasibility Study, Hagen Farm Site,Warzyn Job No. C13452.

Warzyn Engineering Inc., 1989b. Technical Memorandum - Number 1, RemedialInvestigation/Feasibility Study, Hagen Farm Site, Warzyn Job No. C13452.

Warzyn Engineering Inc., 1990a. Technical Memorandum - Number 2, RemedialInvestigation/Feasibility Study, Hagen Farm Site, Warzyn Job No. C13452.

Warzyn Inc., 1990b. Feasibility Study, Source Control Operable Unit, Hagen FarmSite, Warzyn job No. 13452.74.

I


January 17,1992• Page 4-2

Warzyn Inc., 1991a. Technical Memorandum "- Number 3, RemedialInvestigation/Feasibility Study, Hagen Farm Site, Warzyn Job No. C13452.15.

Warzyn Inc., 199Ib. Technical Memorandum - Number 4, Pumping Test/CarbonTreatability Study, Hagen Farm Site, Warzyn Job No. C13452.25.

Warzyn Inc., 1991c. Remedial Design/Remedial Action Work Plan, Source ControlOperable Unit, Hagen Farm Site, Warzyn Job No. 15340.01.

Warzyn Inc., 1991d. Alternatives Array Document, Groundwater Control OperableUnit, Remedial Investigation/Feasibility Study, Hagen Farm Site, July 1991,Warzyn Job No. 13452.39.

Warzyn Inc., 199le. Final Remedial Investigation Report, Hagen Farm RI/FS,November 1991, Warzyn Job No. 13452.35.

MSR/vlr/MAL/SBH/GEA/njt/STSlmad-602-21d]1534010/122 .

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ATTACHMENT C

November 4,1991

Mr. Jae Lee, RPMU.S. Environmental Protection AgencyRegion V230 South Dearborn Street, 5HS-11Chicago, Illinois 60604

Re: Conference Call of October 23,1991Hagen Farm RI/FS

Dear Mr. Lee:

A conference call at 2:30 p.m. on October 23, 1991 was initiated byWarzyn on behalf of Waste Management of Wisconsin (WMWI) inorder to discuss U.S. EPA comments and concerns on the Draft RIReport, specifically regarding monitoring well nest 34. This lettersummarizes that conference call.

The following individuals were involved:

• Mr. Jae Lee (U.S. EPA)• Mr. Craig Thomas (U.S. EPA)• Ms. Dee Brncich (WMWI)• Mr. Steven Termont-Schenk (Warzyn)• Mr. James Moser (Warzyn)

It was agreed by all parties that a deeper well was not required at wellnest 34. You stated that no additional documentation is required in theFinal RI report with respect to placement of the screen in monitoringwell P34B. You requested that a reference to this conference call andAttachment B3 from the "Responses to Agency Review Comments onTechnical Memoranda Nos. 1 through 4" dated September 3, 1991, beincluded in WMWI's responses to U.S. EPA review comments on theDraft RI report.

It was agreed that the downgradient plume has been sufficientlycharacterized to complete the RI for the Groundwater ControlOperable Unit and that no data gaps exist for purposes of the RI. Itwas further agreed that additional characterization of the southernportion of the downgradient. off-site plume would be required duringthe initial phase of the remedial design phase in order to effectivelyimplement remedial actions.

You stated that WMWI had 45 days from October 9,1991 to respond tothe U.S. EPA comments on the Draft RI (August 30, 1991) report;responses are due by November 15, 1991. Concurrent with theresponses submittal WMWI should submit the Final RI report. Youfurther stated that the U.S. EPA and WDNR are pleased with thef°rmat and content of the Draft RI report and that WMWI does not

AND CRT.™™ need to respond to Versars comments, but suggested that WMWI

MADISONONE SCIENCE COrKT

PO BOX 5.-WMADISON, VS1 y-05

(608) 2.11-r-rFAXf 60812-3-2513

X&RZYNMr. Jae Lee

.' U.S.EPANovember 4.1991

Page 2

enhance the summary section of the RI report. You stated that therewere no U.S. EPA comments on the Baseline Risk Assessment (BRA)and that the BRA required no revision.

You further stated that the schedule for issuance of the Record ofDecision has been revised to June 1992.

If you have any questions or concerns regarding this document, pleasecall.

Sincerely,

'ARZYN INC

lames E. Mose;Project Hydrogeologist

Steyen Termont-Schenk, P.E.Project Manager

STS/kml/STS/GEAlmad-111-89]

. 13452.35

cc: Ms. Terry Evanson. WDNRMs. Dee Brncich, WMWI

SPOT ELEVATION

GBOUNO CONTOUR (CONTOUR INTERVAL: JFT)

FENCE UNE

TREES AND SHRUBS

ACCESS ROAD

APPROXIMATE PROPERTY UNE

UMITS OF LANDFILL

GHOUNOWATER MONTTORINQ WELL LOCATION AND NUMBER

'*•** 6ROUNOWATER PIEZOMETER NEST LOCATION AND »»>MBER

ABANDONED SOURCE CHARACTERIZATION WELL LOCATIONAND NUMBER

OBSERVATION WELL LOCATION AND NUMBER

RECOVERY WELL LOCATION AND NUMBER

PROPOSED VAPOR EXTRACTION WELL KLO.)

PROPOSED PRESSURE MOMTORWO NEST 0 - f ID.WELLS SCREENED AT SUCCESSIVE rtTEPVALS)

• i ^r>—^. *CW1*! I 06'-5^i"OHeo)*'V ! ^EW3«**>7

MQIES1. BASE MAP DEVELOPED FROM AN ACMAL SURVEY PERFORMED BY

AEROJHETHICENOINeB«Na»lC, DATED M7-W. HORIZONTALAND VERTICAL CONTROL ESTABUSHED THROUGH AERIALPHOTOQRAMMETRY.

TOPOGRAPHY IS SHOWN IN U.3.0.3. DATUM. ELEVATIONS SHOWNREPRESENT CONDITIONS PRIOR TO WASTE CONSOUOATION ANDLANDFILL COVER CONSTRUCTS

9. ORID BASED ON STATE PLANE COORDWATE SYSTEM.

'% |-*__.

863.2X

200B2|

SCAlYlN FEET FIGURE 1

PRESSURE MONITORINGPORT

TOP OFLANDFILL COVER— i

-WELL HEAD ASSEMBLY(FITTED TO WELL IN FIELDDURING PILOT TEST)

>—PVC TEE WITH[V/^ THREADED PLUGp3——~TO VACUUM PUMP

cna>EXISTINGNR500 COVER

I.E

REFUSE/WASTE ->.

^SUBWASTEUNSATURATED SOILS

WATER TABLE— i1

^

p\v\\

CONCRETE SURFACE SEAL

PIPE\ \ \ \ \ \ \ \ \ \

HYDRATED GRANULAR BENTONITE SEAL

•0.010" SLOTTED PVC WELLSCREEN (APPROXIMATE SCREENINTERVAL 8.0' TO 28.01)

PEA GRAVEL

NOTES1.

2.

EXTRACTION WELLS EW1. 2 AND 3 ASSHOWN HERE.

NOT TO SCALEHOLE

DIAMETER

EXTRACTION WELL EW1A ISFROM APPROXIMATELY 5* INTO THEWATER TABLE. TO THE FILL ZONE/SUBWASTE SOILS INTERFACE (APPROXIMATELY5' ABOVE THE WATER TABLE).

BASED ON RESULTS FROM EWI AND EW1A.EW2 AND EW3 COULD CONSIST OF TWOSEPERATE WELLS. ONE SCREENED INWASTE. THE OTHER IS SCREENED INSUBWASTE SOILS.

FIGURE 2

VAPOR EXTRACTION TEST WELL Drown TPB/JLH Checked_______EXTRACTION PILOT STUDY Revisions^ CLARIFIED NOTE 2. ADDED

REMEDIAL DESIGN / REMEDIAL ACTION NOTE 3HAGEN FARM SITETOWN OF DUNKIRK. DANE COUNTY. WISCONSIN______________________

Dote

1 5340 A8

,*,*A.t&« .A. __.^U

N

N

PRESSURE MONITORINGPORT ——

TOP OFLANDFILL COVER-.

^^\\\^NCOEXISTING 5' VVVA\V\NR500 COVER\<O\\\^\\\\\\^

T^ REFUSE/

WASTE -^X

PEA GRAVEL ——

^SUBWASTEUNSATURATED SOILS -^

WATER TABLE-iI V

'—

^x;L.

'* ' '•

' •*-^

Ii-I•':'/.•'.•'. ^

i

— WELL HEAD ASSEMBLY(FITTED TO WELL IN HELDDURING PILOT TEST)r PVC TEE WITH

THREADED PLUG

II

|Xr '.'.'

!_ • •E v:

............. . . . . . . . . . .. . . . . . . . . . . . .

^-CONCRETE SURFACE SEAL

VV2" I.D. SCH. 40 PVC PIPEx\ \ \ \ \ \ \ \ \ \ \^XHYDRATED GRANULAR BENTONITE\\\\\\\\\\\\x

^0.010" SLOTTED PVC WELLSCREEN (APPROXIMATE SCREENINTERVAL 8.0' TO 10.5')

ji — HYDRATED GRANULAR' BENTONITE SEAL

/-^0.010" SLOTTED PVC WELLSCREEN (APPROXIMATE SCREENINTERVAL 14.0' TO 16.5')

—— ——— *>> —— — — — -^ _- —— HYDRATED GRANULAR

BENTONITE SEAL

^0.010" SLOTTED PVC WELLSCREEN (APPROXIMATE SCREENINTERVAL 20.0' TO 22.5')

SEAL

| 8" |* HOLE *DIAMETER

NOT TO SCALE

NOTES

1. INSTALLATION DEPTHS ANDLENGTHS WILL BE DETERMINEDIN THE FIELD BASED ONGROUNDWATER ELEVATION.

FIGURE 3

WARZYNTYPICAL MONITORING PROBE NEST Drown Checked

HAGEN FARM SITETOWN OF DUNKIRK. DANE COUNTY. WISCONSIN

LENGTHS Dote,0.

1 5340 A9

X 907.2 SPOTELEVATION

— 880—- GROUND CONTOUR (CONTOUR INTERVAL 2 FT)

X——— FENCEUNE

TREES ANO SHRUBS

——— ——— ACCESSROAO

__»^_v APPROXIMATE PROPERTY UNE

_.«.._._ LIMITS OF LANDFILL

N 332.500 ft"*7 GROUNDWATER MONITORING WELL LOCATION AND NUMBER

GROUNDWATER PIEZOMETER NEST LOCATION ANO NUMBER

ABANDONED SOURCE CHARACTERIZATION WELL LOCATIONAND NUMBER

OBSERVATION WELL LOCATION ANO NUMBER

RECOVERY WELL LOCATION AND NUMBER

PROPOSED VAPOR EXTRACTION WELL H" LDJ

CONCEPTUAL APPROACH TO VAPOR EXTRACTION SYSTEM

EXISTING NR50QyQVERED LAN

ALTERNATIVE USE OF SECOND VACUUM EXTRACTION PUMPWITH NO AH TREATMENT

APPROXIMATE EXTENT OF ISVE ASSUMING A 100 FTRADIUS OF INFLUENCE FOR EACH EXTRACTION WEU.

AIRTREATMENT

"7OPTIOMAL)1. BASE MAP DEVELOPED FROM AN AERIAL SURVEY PERFORMED BY

AERO-METRIC ENGINEERING INC. DATED 1-I747. HORIZONTALANO VERTICAL CONTROL ESTABUSHED THROUGH AERIALPHOTOGRAMUETRY.

1. TOPOGRAPHY IS SHOWN IN U.S.tS. DATUM. ELEVATIONS SHOWNREPRESENT CONDITIONS PRIOR TO WASTE CONSOUOATtON ANDLANDFILL COVER CONSTRUCTION.

3. GRID BASED ON STATE PLANE COORDINATE SYSTEM.

LTUTJ———ISCALE IN FEET

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WARZYN INC.CHICAGO • DETROIT • MADISON • MILWAUKEE • NEW YORK • PHILADELPHIA

FOR MORE'INFORMATION CALL: 1-800-388-0288

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