site characterization delivery order no....

File: 18GD.B.

SITE CHARACTERIZATIONWORK PLAN FOR AOC-08

EIELSON AIR FORCE BASECONTRACT NO. DACA85-94-D-ooi1

DELIVERY ORDER NO. 0011

U.S. Army Corns of Engineers, Alaska DistrictP.O. Box 898

Anchorage, Alaska 99506-0898

Submitted by:

AGRA EARTH & ENVIRONMENTAL, INC.3504 INDUSTRIAL AVENUE, SUITE 5

FAIRBANKS, ALASKA 99701

7-024-05006-0

JUNE 1999

OAGRAE*SGIEERgNG GLOBAL SOLUPtONS

WORK PLAN FOR AOC-08EIELSON AIR FORCE BASE, ALASKA

CONTRACT NO. DACA85-94-D-0011DELIVERY ORDER NO. 001 1

June 1999

U.S. Army Corps of Engineers, Alaska DistrictP.O. Box 898

Anchorage, Alaska 99506-0898

7-024-05006-09

Ifz /1I f Doug S. Dusek

Environmental Scientist

t'4eZ~Kri ePalm5Staff Geologist

GAGRAENGINEERING GLOOAL SOLUTIJONS

Eielson Air Force Base 7-024-05006-0Site Characterization Work Plan AOC 08 June 1999Eielson Air Force Base Farm Road Pagei

TABLE OF CONTENTS

1.0 INTRODUCTION........................1.1. 1 Location........................21.2 Site History................................................. 21.3 Environmental Setting ......................................... 21.4 Data Summary............................................... 2

2.0 SITE CHARACTERIZATION ......................................... 122.1 Site Conceptual Model ........................................ 122.2 Geophysical Study...........................................1 52.3 Soil Sample Collection ........................................ 15

2.3.1 Field Screening .............................. ......... 152.3.2 Analytical Sampling.....................................1 52.3.3 Soil Boring Sampling.................................... 16

2.4 Decontamination Procedures.................................... 162.5 Management of Investigative-derived Waste......................... 172.6 Groundwater Investigation ..................................... 17

2.6.1 Groundwater Level Measurement ........................... 172.6.2 Purging Wells ........................................ 182.6.3 Sample Collection...................................... 182.6.4 Laboratory Analysis..................................... 19

2.7 Surface Water Sampling ................................... ... 19

3.0 UIST TANK REMOVAL ............................................. 203.1 Work Description............................................ 203.2 Documentary Sampling ....................................... 213.3 Investigative Derived Waste (IDW) ............................... 223.4 Site Safety ................................................ 22

4.0 QUALITY ASSURANCE PROGRAM PLAN............................... 23

5.0 SITE SAFETY AND HEALTH PLAN.................................... 23

6.0 REFERENCES................................................... 23

LIST OF FIGURES

Figure 1 State Map.................................................. 3Figure 2 Location Map .................. I............................. 4Figure 3 Site Map ................................................... 5Figure 4 Site Conceptual Model, Human Health Exposure Pathways ............. 13Figure 5 Site Conceptual Model, Ecological Exposure Pathways ................ 14

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LIST OF TABLES

Table I Organic and PCB Analytical Results for Soil.......................... 7Table 2 Organic and IP06 Analytical Results for Water........................ 8Table 3 Inorganic Analytical Results for Soils............................... 9Table 4 Inorganic Analytical Results for Water ............................. 1 0Table 5 Polynuclear Aromatic Analytical Results for Water .................... 1 1

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Elelson Air Force Base 7-024-05006-0Site Characterization Work Plan AOC 08 June 1999Eielson Air Force Base Farm Road Page 1

1.0 INTRODUCTION

Records of Ejelson Air Force Base (AFB) list AOC 08 as an old anti-aircraft artillery site built inthe early 1950's to provide protection to Eielson AFB. However, reports suggest that the site wasoccupied by Fort Wainwiight personnel. The site consisted of nine bunkers constructed using 55-gallon drums filled with sand that surrounded and provided protection for anti-aircraft guns andpersonnel manning the guns. Several additional support structures exist at AQO 08 includingfifteen concrete pads that served as foundations for various buildings within the compound. Visualobservations suggest that some uses may have included, but are not limited to barracks, bathhouses, maintenance shops, power generation, a kitchen, and dining hall.

During operations, the various facilities required heating fuel, diesel fuel, gasoline and solvents.Petroleum stained soils observed on a shallow slope at the site, along with a distinct petroleumodor have been detected in the immediate area. Limited investigations by AGRA Earth &Environmental (AGRA) and ASRC Contracting Company Inc. (ACCI) confirmed petroleumproducts have impacted the soil and groundwater. One underground storage tank has been foundat the site near one of the concrete pads and may or may not be contributing to the soil impacts.It is not known if heat was supplied to the various structures from a central location or if eachstructure had its own heating fuel tank and heating system.

In the area confirmed to be impacted by petroleum products, the soil surface has been reworkedby heavy equipment as evidenced by tire or track ruts. Abandoned 55 gallon drums are found inthe area and suggest that the reworked area may be an old landfill site.

The scope of work for this work plan is based on conversations with Jim McMillan at CES/CEV,Eielson AFB and consist of the following tasks:

* Evaluate source or sources of groundwater and soil impacts;

* Conduct a geophysical study using an EM31 metal detector to confirm the existence ofburied debris and the areal extent of buried debris;

* Use the EM31 metal detector to search for buried storage tanks and piping at or near theconcrete pads;

* Delineate the vertical and horizontal extent of soil and groundwater impacts at the site;

* Acquire information to make recommendations on cleanup methods and cleanup levelsoutlined in 18AAC75;

* Assess contaminant pathways and potential receptors;

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* Estimate groundwater flaw direction and velocity based on groundwater elevational data;

* Remove and dispose of a buried fuel tank and evaluate if the soil and groundwater wereimpacted by its presence; and

* Collect groundwater and sail parameters including hydraulic conductivity, hydraulicgradient, oxygen (02) carbon dioxide (C02), conductivity, pH, organic carbon content ofsoil, dry soil bulk density, water and air filled porosity and moisture content to helpdetermine proper cleanup method.

1.1 Location

Elelson AFB is located in the Fairbanks North Star Boraugh, 21 miles southeast of Fairbanksalong the Richardson Highway (Figure 1 and 2). AOC-8 is located one mile west of the ElelsonAFB property boundary near Piledriver Slough. The property is accessed by the Eielson FarmRoad previously known as Old Valdez Trail.

1.2 Site History

Eielson AFB was established in 1944. The primary mission of Eielson AFB is to train and equippersonnel for close air support of ground troops in an arctic environment. In carrying out thatmission, the storage and handling of fuels and solvents have led to soil and groundwatercontamination. On November 21, 1989, Eielson AFB was listed on the National Priorities List bythe U.S. Environmental Protection Agency (EPA). This designated the facility as a federalSuperfund site, subject to the requirements of the Comprehensive Environmental Response,Compensation and Liability Act (CERCLA).

1.3 Environmental Setting

The climate is typical of Interior Alaska, which is characterized by large diurnal and seasonaltemperature variations, low precipitation, and low humidity. The average summer temperaturesrange between 45 and 610F; average winter temperatures range between -14o F and 80F. Theextreme recorded high since 1944 was 920F, while the low has been -640F. The area receivesabout 11 inches of precipitation each year, deriving much of the moisture content fromapproximately 70 inches of snow annually. Drainage of the site is west toward the Tanana River.Immediate drainage from the impacted area forms a shallow pond about 1-foot to 2-feet deepcovering two acres. Most of the soil in the immediate vicinity consists of alluvial gravels andcoarse sands.

1.4 Data Summary

A limited field investigation was conducted by ACCI personnel on August 25, 1997. Soil sampleswere collected from seven locations at an approximate depth of 0.5 feet to 6 feet below groundsurface (Figure 3). ~A R

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170' 160' 150' 140' 130' 120'

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LOCAlTION MAPNO SCALE

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DESIGN: DSD DRAWN: PC2 IW/O:9-024-05005-O FILE: DTE:- 04/28/1 999 SCALE: AS SHOWN

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Water samples were collected from a shallow pond, a well, and a small pit. Samples wereanalyzed by the following methods:

* Diesel Range Organics (DRO) by Alaska Method AKlO2;* RCRA 8 Metals by EPA Method 6000/7000;* Semivolatile Organic Compounds (SVOC) by EPA Method 8270;* Volatile Organic Compounds (VOC) by EPA Method 8260;

PCFBs/Pesticides by EPA Method 8081; and* Polynuclear Aromatic Hydrocarbons (PAH) by EPA Method 610.

The sample results are presented in the tables I to 5 and are compared with cleanup levels fromTable 831 and Table C located in the ADEC Oil and Hazardous Substances Pollution ControlRegulations, 16 AAC 75.

Although the Practical Quantitation Limits (PQLs) exceeded the maximum concentration levels forseveral compounds, the results of ACCI's investigation indicated that the primary problem at thesite is DRO impacts to soil and groundwater.

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Ejelson Air Force Base 7-024-05006-0Site Characterization Work Plan AOC 08 June 1999

Ejelson Air Force Base Farm Road Page 12

2.0 SITE CHARACTERIZATION

AGRA personnel will perform an accelerated site characterization for a suspected petroleumrelease using ASTM standard guide E 1912 and EPA Expedited Site Assessment tools for USTSites: A Guide for Regulators. This work plan describes AGRA's process for collecting siteinformation using rapid sampling techniques with an ORS Chem Sensor equipped to detectpetroleum hydrocarbons in groundwater and a Hanby Kit to detect petroleum hydrocarbons in soilto facilitate on site field interpretations and decision making. The site conceptual model has beenused to design the data collection program. Based on information gained during the initial sitecharacterization, the site conceptual model may be refined to reflect additional information.

AGRA's focus will be to decide the degree and extent of the groundwater impacts at the site. Soilsampling and a geophysical study will help to evaluate if the source area is still contributing to thegroundwater impacts or if the source area has been depleted. A limited number of analyticalsamples may be submitted for BTEX, DRO, or other appropriate analysis during this phase of theinvestigation.

A Samnpling and Analysis Plan will be submitted as a separate document following completion ofthe initial site characterization work and will detail the number of samples, sample location, andanalytical methods.

2.1 Site Conceptual Model

At some sites, site-specific conditions may show that regulatory cleanup levels are moreconservative than necessary. The ADEC has developed several approaches for using site-specific conditions to establish alternative cleanup levels (ACLs) at a petroleum contaminated site.The methods are outlined in 18 AAC 75, Articles 3 and 9, which went into effect on January 22,1999 and allow the site assessor to establish risk-based ACLs. Using ACLs in conjunction witha corrective action may reduce the effort required for cleanup while protecting human health andthe environment. ACLs resulting from a risk assessment are levels that are protective of humanhealth and the environment based on exposure pathways identified at the site.

The process to establish ACLs begins with the development of a site conceptual model. The siteconceptual model depicts the exposure pathways expected to occur at the site based on thecurrent land use, and afuture land use scenario. Site conceptual models developed for this siteare found on in Figures 3 and 4. Further investigation will develop additional conceptual modelsfor future land use at the site.

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2.2 Geophysical Study

The first phase of the project will be to conduct a geophysical investigation designed to locateburied objects or debris. The specific objectives of the geophysical work include examining thepresence of miscellaneous buried debris that may be the source of impacts observed at the site.A hydroax will be used to remove existing brush and small trees to access the areas of concern.

AGRA proposes to use an EM 31 metal detector capable of detecting both ferrous and nonferrousmetals. Differences in ground conductivity are measured and later mapped, confirming thepresence of subsurface variations resulting from ferrous and nonferrous metallic objects. A gridwill be developed at the site using a cloth tape and compass. This grid will provide reference pointsfor the EM 31 survey. Data from the EM 31 survey will then be plotted on a map and contoured,providing a visual representation of the data. Areas showing highest readings suggest thepresence of metallic material below the surface. AGRA personnel will perform the survey and datainterpretation. The results.will provide additional information in planning the sampling effort andinformation regarding the size of the source area.

2.3 Soil Sample Collection

Soil samples will be collected from the presumed source area to assess conditions that may beimpacting the groundwater. Soil samples will be screened in the field and selected samples willbe submitted for laboratory analysis. The following sections describe the general sampling andhandling procedures as well as the collection methods specific to sampling from excavations andsoil borings.

2.3.1 Field Screening

Screening samples will be collected by filling a clean, sealable plastic bag approximately one-thirdfull of soil. The screening samples will be labeled directly on the bag using an indelible marker.For the headspace analyses, each sample will be warmed inside the field vehicle for approximately20 minutes prior to screening. Sample analysis for screening consists of inserting the PID probeintd a small opening at the top of the sample bag and allowing the headspace gas inside the bagto be pumped through the instrument. The PID provides a digital display, in parts per million (ppm),of the concentration of volatile organic compounds in the headspace gas. For each sample, themaximum reading observed on the display will be recorded 'as the gas concentration for thatsample.

2.3.2 Analytical Sampling

Analytical samples will be collected in laboratory-prepared sample jars using standard samplingtechniques. AGRA employees will be the only persons on the site authorized to collect and handlethe samples. The sampler will wear Nitrile gloves while collecting the samples and a new pair ofgloves will be worn for each sample. If equipment other than gloved hands is necessary to obtainthe sample, that equipment will be decontaminated before use. The sample jars will be completelyfilled with soil, the rims will be wiped clean before replacing the lids, and thjr will be tightly

ENGINEERING GLOBAt SOLUTIONS


capped. The jars will be labeled with the project number, sample identification number, the timeand date of sampling, the analytical method required, and the initials of the sampler. All sampleswill be stored in chilled coolers while on the site to maintain a sample temperature of approximately4 0C.

Duplicate samples will be collected at an approximate rate of one duplicate for every 1 0 primarysamples on a per analysis basis. Each duplicate sample will include a quality control (QC) blindduplicate sample and a quality assurance (QA) duplicate sample. Duplicate samples will becollected by placing a sufficient quantity of soil in a clean stainless steel bowl and thoroughly mixingthe soil before filling the jars. However, when sampling for volatile compounds, the duplicatesamples will be collected from immediately adjacent locations in the sampling media to avoid lossof the volatiles during the mixing process.

The analytical samples will be accompanied by trip blanks during site work and shipment to thelaboratory. The trip blanks will be analyzed for GRO and BTEX to quantify any effects due to thehandling process.

All samples will be shipped to COE-certified laboratories for analysis. Before shipment, theinformation on each sample label will be transferred to a chain-of-custody (COG) form. The COCform will accompany the samples to the laboratories and will include only those samples includedin that shipment. A copy of each COG form will be kept in the project file to allow tracking of thesamples and receipt of the analytical results.

2.3.3 Soil Boring Sampling

Soil samples from shallow borings (less than two feet deep) will be collected using hand augers.Samples taken at depths greater than two feet will be collected using a Minuteman portable drillrig to advance to the approximate sample depth. A hand auger will then be used to collect thesample at the proper depth. All work will be completed by AGRA personnel.

2.4 Decontamination Procedures

Whenever possible, samples will be collected using disposable sampling equipment to reduce thepotential for cross-contamination of samples. When decontamination of reusable equipment isnecessary, the decontamination process will continue as follows:

* The sampling equipment will first be scrubbed clean in a solution of Simple Green® orsimilar detergent;

* The equipment will then be double rinsed using clean tap water; and* The equipment will be final rinsed using distilled or deionized water. When rinsate samples

are required, they will be collected immediately following this final rinse.

All water and solutions used for equipment decontamination will be contained in buckets duringuse. The collected wash water and rinsate will be disposed by emptying the buckets onto thestockpile of potentially-impacted soil.*A R

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2.5 Management of Investigative-derived Waste

Investigative-derived waste resulting from this project is expected to consist of the following items:

* Potentially-impacted soils;* Decontamination solutions and rinse water;* Scrap metal and other buried debris; and* Miscellaneous materials including disposable sampling equipment and paper trash.

Decontamination water, purge water, and rinsate water will be containerized and delivered to theEielson Mobile Wastewater Treatment System for processing. Any rinsate water will be collectedin 55-gallon drums or other suitable containers. Samples of the water in each drum will besubmitted for laboratory analysis to assess disposal requirements. Contaminated water will betransported either to the Mobile Wastewater Treatment System or to the Eielson HazMat Yarddepending on the nature and type of contaminants present. Non-contaminated water will bediscarded on site. It is expected that the disposable sampling equipment and other accumulateddebris will not be hazardous and can be discarded as solid waste.

2.6 Groundwater Investigation

AGRA proposes installing temporary well points to gain access to the groundwater interface. Oncethe groundwater plume has been delineated, additional permanent monitoring wells will be installedto perform long-term monitoring.

2.6.1 Groundwater Level Measurement

The following procedure will be used to collect the depth to groundwater inside each well:

* Proper equipment operation will be verified before placement in wells. A Keck interfaceprobe or instrument capable of detecting hydrocarbons will be used to gauge all well.

* Measurements will be collected starting at the cleanest well and ending with the mostcontaminated well, if this information is available.

* The sensor head will be carefully lowered into the well opening by gently reeling out themeasuring tape.

* The sensor will be lowered until a signal is obtained. The sensor will be slightly raised andlowered to lock in the loudest signal.

* The tape will be held at the point which corresponds to the survey mark on top of wellcasing, or the highest point on the casing if there is no survey mark. Measurements will betaken from this paint.

* If the instrument has a direct reading measuring tape, the depth ~asurement will be

" N GlINEERING GtOBAL SOLUTIONS


recorded at the survey mark. If the tape is marked at five foot intervals, a tape measureor ruler will be used to measure from the point on the tape held at the survey mark to thenearest increment marker.

Exposed tape will not be reeled back into the instrument until it has been decontaminated.The probe and measuring tape will be decontaminated by rinsing with dleionized water.Under conditions of noticeable contamination, the probe and exposed tape will be washedwith a non-phosphatic detergent solution and rinsed with distilled water. If significant visibleor olfactory contamination is noted, the probe and tape will be rinsed with methanol followedby distilled water until clean. The probe will be dried with paper towels and reeled back intoits case.

If measurable hydrocarbon concentrations are indicated by the depth to water sounding,a clear polyethylene bailer will be slowly lowered down the well casing to intercept thegroundwater/hydrocarbon interface without being completely submersed. Care will betaken to avoid agitation of the water/hydrocarbons in the well. The apparent thickness ofhydrocarbons collected in the bailer will be measured with a steel tape to the nearest 0.01feet and recorded.

2.6.2 Purging Wells

The following method will be used to purge the wells:

* Using information on the total depth of the well, the diameter of the well casing, and thedepth to water, the amount of water in one casing volume will be calculated;

* Approximately three well casing volumes of water will be purged from the water columnwithin the well using a clean bailer or a pump. If the recharge is fast, it may be necessaryto remove more than the specified amount of purge water; and

* All equipment will be decontaminated as described below before insertion into the well.Bailer rope will be changed between wells.

2.6.3 Sample Collection

Before sampling, procedures for purging wells and using appropriate sample containers will befollowed.

* A new disposable polyethylene bailer will be used for each well. New polyethylene rope willbe used for lowering the bailer into the well;

* The bailer will be lowered slowly until it contacts the water surface. The depth togroundwater obtained before purging the well will be used to gage the distance the bailermust be lowered. After contact is made to the water table, the bailer will be allowed to sinkslowly and fill with a minimum of surface disturbance; AG R A

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Eielson Air Force Base 7-024-05006-0Site Characterization Work Plan AOC 08 June 1999Elelson Air Force Base Farm Road Page 19

* The filled bailer will be slowly raised to the surface. Effort will be made to avoid contact ofthe bailer line to the well casing and/or ground;

* A bottom emptying device will be inserted into the disposable bailer, and each samplecontainer will be carefully filled. When applicable, volatile organic sample vials will be filledfirst, to zero headspace, followed by other sample containers, if any;

* The steps above will be repeated until a sufficient sample volume is acquired; and

* Sample labeling, preservation, and transportation procedures will be followed, includingchain-of-custody documentation.

2.6.4 Laboratory Analysis

Soil field screening and other information gathered at the site will be used to select an appropriateanalytical method for sample analysis. The anticipated analytical methods that will be used in thisproject are listed below:

Alaska Method AK 1 01: Gasoline Range Organics (GRO), and Benzene, Toluene,Ethylbenzene, and Xylenes (BTEX);

Alaska Method AK 102: Diesel Range Organics (DRO);

EPA Method 8260: Halogenated and Aromatic Volatile Organics (HVOs); and

EPA Method 8270 Polynuclear Aromatic Hydrocarbons (PAHs).

The volatile samples (GRO, BTEX, and HVOs) will be collected in pre-cleaned, HCI-preserved 40-mL clear glass VOA vials with Teflon-lined silicon septa, and lids. Each sampled will be collectedin a way that reduces aeration and eliminates headspace in the vial. Maximum holding time beforeanalysis for these analytes is 14 days. DRO samples will be collected in pre-cleaned, HCI-preservedl1-L amber jars. The holding time for these samples are 7days. All of the samples willbe stored and transported at temperatures between 2 and 60 C.

2.7 Surface Water Sampling

Should surface waters require sampling, surface water samples will be collected in a way thatreduces the disturbance of sediments. If physically walking into the surface water source isrequired, the sample will be collected upstream from the sampler's position. Sample containerswill be totally submerged when possible to eliminate air pockets in the container (volatile analysisonly). The location of the sample will be indicated as precisely as possible, especially when naturalwater sources are being sampled. Samples will be described in the sample log with respect tocoloration, approximate degree of turbidity, and any other observations noted during sampling.

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Elelson Air Force Base 7-024-05006-0Site Characterization Work Plan AQO 08 June 1999Eielson Air Force Base Farm Road Page 20

The analyses for surface water samples are expected to be the same as those listed for thegroundwater samples. The surface water samples will be handled in the same manner as'thegroundwater samples.

3.0 UST TANK REMOVAL

During April 1999, AGRA personnel confirmed the presence of a storage tank buried about 200yards east of the petroleum stained soils. The tank was dipped, confirming three inches of liquidwith an odor similar to heating fuel.

3.1 Work Description

AGRA will coordinate and manage all activities required for the excavation, removal, and disposalof the buried tank and tank contents from the project site. All excavation, hauling, and handling ofcontaminated materials will be conducted by a licensed general contractor who will complete thework in accordance with the Alaska Department of Environmental Conservation (ADEC) Oil andHazardous Substances Pollution Control Regulations (18 AAC 75). The work will includeexcavating clean and potentially impacted soils in and around the tank area as directed by theAGRA on-site representative, stockpiling potentially contaminated soils in accordance withregulatory requirements, recovering the liquids and other semi-solids contained within the tank asnecessary, backfilling the excavation, and restoring the site to the original surface grade.Specifically, the scope of work for the project is described as follows:

1 . Initial site work includes creating a lined, bermed decontamination cell on the adjacentconcrete pad. The cell will be used as a temporary staging area to hold portions of thetank during cleaning and tank dismantling. The cell will also help contain rinse watergenerated during tank cleaning on site. Shte preparation will involve removing anymiscellaneous debris from the concrete pad to minimize the potential for materials topuncture or tear the cell bottom liner. The decontamination cell will be constructed usinga suitable minimum 20-mil bottom liner that satisfies applicable ASTM specifications for coldcracking (-600F) and tensile strength (125 lb). Sand bedding or suitable clean native soilshall be placed as a first layer on the liner to protect the liner from wear due to placingportions of the tank metal on the liner and associated equipment traffic at the cell entrance.The cell will be bermed on three sides to a height of 1.5 feet, with one end left flush tograde to enable entry to the cell by necessary equipment. The cell will be sized to store thetank and will mheasure 20 feet by 20 feet. The cell will be covered with a removable lO-milreinforced polyethylene plastic cover to shed excess rain water during site work.

2. After the tank is exposed, it will be prepared for removal in agreement with the guidelineslisted in API-RP 1604, Removal and Disposal of Used Underground Petroleum StorageTanks, which includes the following tasks:

a) The liquid will be removed from the tank and disposed of prior to further dismantlingthe tanks;

4AGRAENGINEERING GLOBAL SOLUTlIONS


b) The tanks will be inerted as necessary w ith dry ice and will be tested to check thatsafe conditions exist within the tank interior;

c) The tanks will be removed from the excavation and placed within thedecontamination cell described in Item 1. The disposal subcontractor will removeany tar or sludge from the tanks as needed to complete cleaning of the tankinternals; and

d) The drums generated in item 2c will be transported to Eielson AFB HazMat yard forsubsequent disposal. Any water contained in the tank will be delivered to the MobileWastewater Treatment system located approximately one mile from the project site.After removing the tank contents, subcontractor personnel will clean the tanks priorto disposal at the Fairbanks North Star Borough solid waste landfill.

3. As directed by the on-site AGRA representative, excavated soil will be segregated into twotypes: potentially clean and impacted. The potentially clean soils will be stockpiled adjacentto the work area for use as backfill material. Impacted soils will be placed in a temporarysoil stockpile lined and covered with 1O-mil reinforced polyethylene liner during the project.After excavation is completed, the subcontractor will place a suitable plastic

liner material within the excavation to mark the vertical extent of soil removal. Impacted soilremoved during site work will be replaced to Uts approximate original location.

4. After site work has been completed, the subcontractor will backfill the excavated areas.Backfill will consist of both the soils stockpiled on site and imported clean fill as needed toreplace the former in-place tank volume. Stockpiled soil will be used first so that importedfill can be placed in the upper portions of the excavations. The grade, drainage, andsurface finish will be equivalent to that prior to the start of site work. The work area will berestored to its original condition.

3.2 Documentary Sampling

Throughout site work, experienced AGRA personnel will be on site to observe and document theproject activities. Additional site-specific field documentation will include:

* Qualitative observations of the excavated soil (visual discoloration, staining);

* Field screening of the excavated soil using a photo-ionization detector (PID); and

* Field drawings showing excavation limits, sample locations, and screening measurements.

Direct field screening samples will be collected by filling a clean, sealable plastic bag approximatelyone-third full of soil. The screening samples will be labeled using the same number as thelaboratory sample, and the sample number will be written directly on the bag using an indeliblemarker. Before screening, each sample will be warmed for approximately 15 minutes inside the

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field vehicle. Sample analysis consists of inserting the PID probe into a small opening at the topof the sample bag and allowing the headspace gas inside the bag to be pumped through theinstrument. The PlO provides a digital display, in parts per million (ppm), of the concentration ofvolatile organic compounds in the headspace gas. For each sample, the maximum readingobserved on the display will be recorded as the headspace gas concentration for that sample.

Upon completing soil excavation, AGRA personnel will document soil conditions by collecting soilsamples for laboratory analysis in accordance with ADEC requirements. All laboratory sampleswill be placed into laboratory-prepared sample jars and stored in a chilled cooler while on site. Soilsample collection will be performed according to the following program:

1 . After excavation and removal of the tank is completed, soil samples will be collected fromthe base of the excavation. Up to three samples will be collected from under the tank. Itis anticipated that the samples will be collected at the depth of the water table. The resultsof these samples, combined with soil samples collected during the initial excavation, will beused to provide Eielson with a characterization of soil contamination near the tank.

2. A single duplicate soil sample will be collected.

3. All samples submitted for analysis will be shipped to Columbia Analytical (COE certified)in Anchorage Alaska. The samples will be tested for benzene, toluene, ethylbenzene, andxylenes (BTEX) by Alaska Test Method AKI 0l and diesel range petroleum hydrocarbons(DRO) by Alaska Test Method AK1O02 with a turnaround time of 7 to 1 0 working days fromthe time of sample collection.

3.3 Investigative Derived Waste (IDW)

Hazardous lOW generated during this project will be turned over to the appropriate Eielson AFBpersonnel. Arrangements will be made with Jim McMillan, Eielson AFB Remediation ProjectManager, for the treatment of this water at the Mobile Wastewater Treatment system. The waterwill be transported to the treatment system by the excavation subcontractor. However this disposalmethod is tentative, pending 'an evaluation of the complete laboratory results. Used PPEgenerated during this project is not expected to be hazardous and will be disposed of with otherconstruction debris at the Borough Landfill. All lOW will be managed in accordance with theEieison Air Force Base Installation Restoration Program Investigative Waste Management Plan.

3.4 Site Safety

Maintaining site safety and controlling access to the work area will be given utmost importanceduring the excavation and tank cleaning portions of the project. The excavation subcontractor willenclose the excavated areas using durable, temporary, safety fencing or equivalent at the closeof each work shift.

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4.0 QUALITY ASSURANCE PROGRAM PLAN

Through calendar year 1995, the ADEC required all firms conducting environmental work to havean approved, Quality Assurance Program Plan (QAPP) on file with the appropriate regional office.However, the ADEC document Guidance for Remediation of Petroleum-Contaminated Soil andwater and Standard Sampling Procedures dated September 22, 1995, was intended to eliminatethe need for individual QAPPs by providing standardized sampling procedures for UST projects.In accordance with that intent, AGRA has adopted the Guidance document as its QAPP for bothUST work and other environmental investigations. It is AGRA's intent to conduct this investigationfollowing the standards and procedures described in that document. The reader is referred to theADEC document for specific descriptions of those standards and procedures.

5.0 SITE SAFETY AND HEALTH PLAN

The Site Safety and Health Plan for this project has been prepared as a stand-alone document andhas been submitted under a separate cover.

6.0 REFERENCES

ASRC Contracting Company,lInc. 1997 AQCOOBBunker Demolition RemedialAction Report

AGRA Earth & Environmental. 1997. Work Plan for Site Investigations Multiple sites, Elelson AirForce Base, Alaska

Alaska Department of Environmental Conservation. 1998. Guidance on Cleanup StandardsEquations and input Parameters

Alaska Department of Environmental Conservation 1999. Draft Guidance on Developing SoilCleanup Levels Under Methods Two and Three. March 22, 1999

Alaska Department of Environmental Conservation. 1999. Oil and Hazardous Substances PollutionControl Regulations. 1 8 AAC 75, Articles 3 and 9 (As amended through January 22, 1999)

Alaska Department of Environmental Conservation. 1999. Draft Guidance on Developing SoilCleanup Levels Under Methods Two and Three

Alaska Department of Environmental Conservation. 1999. Risk Assessment Procedures ManualNovember 24, 1998

Engineering-Science. 1994. Final Site Assessment Report of the BX Service Station, Eielson AirForce Base, Fairbanks, Alaska

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