ACAT FOIA Repository 42

United States ArmyCorps of EngineersFormerly Used Defense Sites ProgramProject Closeout ReportHazardous, Toxic, and Radioactive Waste (HTRW)Project # F10AK069603Gambell FUDSSt. Lawrence Island, AlaskaSeptember 2008F10AK069603_07.12_0500_a200-1-er:'m~Prepared By:U.S. Army Corps of Engineers - Alaska DistrictEnvironmental Engineering BranchP.O. Box 6898Elmendorf AFB, Alaska 99506-0898[PAGE INTENTIONALLY BLANK]DEPARTMENT OF THE ARMYU.S. ARMY ENGINEER DISTRICT, ALASKAP.O. BOX 6898ELMENDORF AFB, ALASKA 99506-0898October 6, 2009Environmental Special ProgramsPrograms and Project Management«Title» «FirstName» «LastName»«Company»«Address1»«City», «State» «PostalCode»Dear «Title» «LastName»:It has come to our attention through Sivuqaq, Inc., based in Gambell, Alaska, that a fewstatements regarding land usage in Gambell that were written in the HTRW Project CloseoutReport (Gambell FUDS) are in error. Errors occur specifically, in Section 2.0 on page 2, withinthe third paragraph. That third paragraph is hereby corrected by amendment as follows:The Gambell site was used by the military from 1948 until the late 1950’s1960’s. Variousfacilities were constructed by the U.S. Army and the U.S. Air Force near the village of Gambellto provide housing and operations, aircraft radar, communications, and other functions. Themilitary leasedArmy/Air Force used approximately 2,543 acres in Gambell under Special UsePermits and Public Land Order, of which the U.S. Air Force leased 1,807 acres and the U.S.Army leased the remaining acreage. The Air Force built a base camp in 1950 at the foot ofSevuokuk Mountain and a radar site directly above on the mountain top (both abandoned in1956). The Army occupied several sites during the late 1950s, with a main base camp locatedjust north of Troutman Lake. The Gambell Annex, Gambell Army Site No 1, Gambell Site No2, and Gambell Army Station were not relinquished to BLM until 1965. The Navy also laidcommunications cables from the village of Gambell, up Sevuokuk Mountain, and south toBrunnell Cape.F10AK069603_07.12_0501_a200-1ePlease add this letter amendment to the Gambell HTRW Project Closeout Report datedJune 2009. If you have any questions, please contact me at (907) 753-2689, or bye-mail atcarey.c.cossaboom@usace.army.mil.Sincerely,Carey CossaboomProject ManagerFIOAK069603_07.12_0501.pO:\ESP\Private\FUDS\yroperties\Gambell FlOAK0696\ccc Letters\ Gambell HTRW PCOAmendment_Info Rep & Stakeholder. docMerge with O:\ESP\Private\FUDS,-Properties\Gambell Fl OAK0696\Merge Files\ Amendmentdata source. docTABLE OF CONTENTSLIST OF ACRONYMS ................................................................................................................ IV1.0STATEMENT OF BASIS ...................................................................................................12.0SITE LOCATION AND DESCRIPTION ...........................................................................13.0DESCRIPTION OF THE SELECTED REMEDY AND IMPLEMENTATION ...............23.1 No DOD Action Indicated (NDAI)................................................................................43.1.1Site 5 ...................................................................................................43.2 Remedial Actions Completed ........................................................................................53.2.1Site 7 ...................................................................................................53.2.2Site 8A ................................................................................................63.2.3Site 12 .................................................................................................64.0HIGHLIGHTS OF COMMUNITY PARTICIPATION......................................................75.0CONCLUSION....................................................................................................................76.0REFERENCES ....................................................................................................................87.0FIGURES...........................................................................................................................10DECLARATION ...........................................................................................................................15Gambell HTRW Project Closeout ReportiiiLIST OF ACRONYMSADECBCSCERCLADERPEPADODFSFUDSHTRWIRAMWMWHNALEMPNCPNDAIOSCIPIDPOLRABUSACEAlaska Department of Environmental ConservationBristol Construction Services, LLCComprehensive Environmental Response, Compensation and Liability ActDefense Environmental Restoration ProgramU.S. Environmental Protection AgencyDepartment of DefenseFeasibility StudyFormerly Used Defense SiteHazardous, Toxic, or Radioactive WasteIndian Restoration Actmonitoring wellMontgomery Watson HarzaNative American Lands Environmental Mitigation ProgramNational Oil and Hazardous Substances Pollution Contingency PlanNo Defense Action IndicatedOil Spill Consultants, Inc.photoionization detectorpetroleum, oil, or lubricantsRestoration Advisory BoardU.S. Army Corps of EngineersGambell HTRW Project Closeout Reportiv1.0STATEMENT OF BASISAuthority for the Defense Environmental Restoration Program for Formerly Used Defense Sites(DERP-FUDS), Hazardous, Toxic, and Radioactive Wastes (HTRW) projects is derived from theDefense Environmental Restoration Program, 10 USC 2701-2707. The Gambell FUDS propertynumber is F10AK0696. The HTRW project number is F10AK069603.The response was consistent with the Comprehensive Environmental Response, Compensationand Liability Act (CERCLA), the National Oil and Hazardous Substances Pollution ContingencyPolicy (NCP) and the Defense Environmental Restoration Program (DERP). Under the DERP,HTRW projects include environmental response actions at an area of an eligible FUDS propertyas the result of Department of Defense (DoD) activities related to hazardous substances,pollutants, and contaminants as defined in CERCLA, petroleum, oil, or lubricants (POL),hazardous wastes or hazardous waste constituents. HTRW restoration activities can involve thecleanup of petroleum in soils or groundwater, even though it may not be subject to regulationunder CERCLA, where the Secretary of Defense determines that such activities will result incorrection of environmental damage posing imminent and substantial endangerment to the publichealth or welfare or to the environment.The decision to closeout this HTRW project is based on the results of a Remedial Investigation,Feasibility Study, implementation of remedial actions as selected in two Decision Documents,and other removal action activities conducted between 1994 and 2006.2.0SITE LOCATION AND DESCRIPTIONThe Native Village of Gambell is located on St. Lawrence Island, in the western portion of theBering Sea, approximately 200 air miles southwest of Nome, Alaska (see Figure 1). Gambell islocated at latitude 63° 46’ 49” North and longitude 171° 43’ 46” West. The village is situated ona gravel spit characterized by wave terraced beach areas with an elevation of approximately 30feet above mean sea level (MSL). Troutman Lake is located south of the village. SivuqaqMountain borders the gravel spit and Troutman Lake on the east, rising to an elevation of 619feet above MSL. St. Lawrence Island is currently owned jointly by Sivuqaq, Inc., in Gambell,Alaska, and the Kikulget, Inc., in Savoonga, Alaska. Non-Native land on St. Lawrence Island islimited to state land used for airstrips and related facilities in Gambell and Savoonga.The FUDS program has assigned the Gambell site property number # F10AK0696. The HTRWproject number for Gambell is #F10AK069603. The State of Alaska, Department ofEnvironmental Conservation (ADEC) tracks the entire site with reckey # 198532X917919, andalso lists individual areas of concern by separate reckeys. The United States EnvironmentalProtection Agency (EPA) identification number for Gambell is AKD981765894.Gambell is inhabited primarily by Native St. Lawrence Island Yupik people, who lead asubsistence-based lifestyle. The population of Gambell has been slowly increasing (2 percentper year growth) since 1990; this trend is expected to continue. U.S. Census data from 2000Gambell HTRW Project Closeout Report1reports the total population at 649 residents. Residential development is planned to expand to theeast of the Village of Gambell; supporting infrastructure for the village may expand to the southof Troutman Lake. Land use at the Gambell site is residential, recreational, and open space orundeveloped. The recreational and open space lands are primarily used for subsistence hunting,gathering, and eco-tourism.The Gambell area supports habitat for a variety of seabirds, waterfowl, and mammals that eitherbreed in or visit the area. The area surrounding the top of Sevuokuk Mountain, above theVillage of Gambell, supports a large bird rookery. The birds and bird eggs serve as a subsistencefood source for local inhabitants. The ocean surrounding the Gambell area is used extensivelyfor subsistence hunting of whales, walrus, seals, sea birds, and fish.The Gambell site was used by the military from 1948 until the late 1950’s. Various facilitieswere constructed by the U.S. Army and the U.S. Air Force near the village of Gambell to providehousing and operations, aircraft radar, communications, and other functions. The military leasedapproximately 2,543 acres in Gambell, of which the U.S. Air Force leased 1,807 acres and theU.S. Army leased the remaining acreage. The Air Force built a base camp in 1950 at the foot ofSevuokuk Mountain and a radar site directly above on the mountain top (both abandoned in1956). The Army occupied several sites during the late 1950s, with a main base camp locatedjust north of Troutman Lake. The Navy also laid communications cables from the village ofGambell, up Sevuokuk Mountain, and south to Brunnell Cape.3.0DESCRIPTION OF THE SELECTED REMEDY AND IMPLEMENTATIONThis project closure report covers impacts identified as HTRW. A total of 38 sites wereidentified in Gambell. A remedial response was selected for 37 of these sites under a DecisionDocument dated June 2005. A decision on Site 5 was postponed until after additionalmonitoring was conducted in 2005 and 2006. Site 5 was addressed in a Decision Documentdated September 2007. No further action was the selected response for 35 of these sites (Table1). Sites 7 and 12 required excavation of contaminated soil. Site 8A required debris removal.The sites discussed in this document are listed in Table 1 and depicted on Figure 2.Table 1 – Remedial Responses by Site LocationSite1ANorth Beach1BArmy Landing Area1CAir Force Landing Area2Military Burial Site3Communications Facility4AAir Force Radar Site4BFormer Quonset Huts4CDiscarded Drums4DFormer Transformers4EWestern Face of Sevuokuk MtnGambell HTRW Project Closeout ReportSelected Remedial ResponseNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further Action25678A8B8C8D910111213141516171819202122232425A25B262728Tramway/Water SupplyMilitary LandfillMilitary Power FacilityMarston MattingBuried DebrisNavy LandfillBeach AmmunitionAsphalt DrumsArmy/Air Force TrailsCommunication Cable RouteNayvaghat Lakes Disposal SiteRadar Power StationNavy Plane Crash SiteTroutman Lake Disposal SiteMunicipal Building SiteArmy LandfillsMain CampDiatomaceous EarthSchoolyardToe of Sevuokuk MountainFormer CAA HousingDebris from High SchoolSouth of Municipal BuildingGambell South Housing UnitsLow Drainage AreaPossible Debris Burial SiteDrum Storage AreaDisturbed GroundNo Further ActionNo Further ActionExcavation and off-site disposal of arsenic-contaminated soilRemoval and off-site recycling/disposal of exposed metal debrisNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionExcavation and off-site disposal of lead-contaminated soilNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionNo Further ActionThe Feasibility Study (USACE, 2004a) documented the processes by which environmentalresponse actions were identified and evaluated for the Gambell site. The Feasibility Study wasconducted in accordance with the Comprehensive Environmental Response, Compensation, andLiability Act (CERCLA), using the standard evaluation criteria. The study provided informationto support an informed risk management decision regarding the most appropriate remedy foreach Gambell site.A series of Remedial Investigations were performed prior to completing the Feasibility Study.During the remedial investigation process, soil, sediment, and shallow-aquifer groundwater weresampled and analyzed for a wide range of organic and inorganic constituents. Contaminantsdetected in the soil and shallow-aquifer groundwater were primarily fuels and metals.The selected remedy for the Gambell site was documented in two separate Decision Documents(USACE, 2005 and 2007) and supported by the Administrative Record for the site. This recordis available at the Information Repository within the Sivuqaq Lodge in Gambell, Alaska. Thedebris and contaminated soil excavated per the June 2005 Decision Document was shipped offIsland for recycling or disposal at a permitted landfill. Additional water sampling at Site 5 wasconducted during 2005-2006. The results of the water sampling demonstrated that no furtheraction was needed.Gambell HTRW Project Closeout Report33.1NO DOD ACTION INDICATED (NDAI)No further Department Defense action indicated was selected as the response for 35 out of the 38sites because there was no evidence of any remaining environmental hazards at these sites. Adetailed summary of the remedial investigation results, removal of debris and hazardousmaterials, and other previous activities is found in the Decision Documents dated June 2005 andSeptember 2007. Environmental investigations and cleanup activities at Gambell began in themid 1980’s. The first major environmental study, the remedial investigation, was performed atGambell in 1994. In 1996, the second phase of remedial investigation was performed.In 1997, a USACE contractor, Montgomery Watson, removed visible surface debris fromvarious sites around Gambell (MW, 1997). During the 1999 field season, Oil Spill Consultants,Inc. (OSCI) performed further cleanup activities in Gambell, including the removal of additionaldebris exposed by frost jacking after the 1997 cleanup activity (OSCI, 2001). OSCI removed atotal of 26.8 tons of hazardous and non-hazardous containerized wastes such as asphalt drums,paint, generators, batteries, empty drums, and transformer carcasses. OSCI also removed 71 tonsof exposed metal debris such as runway Martson matting, cable, fuel tanks and equipment parts;and excavated 72 tons of contaminated soil.A supplemental remedial investigation was conducted by Montgomery Watson Harza during the2001 field season, to verify previously collected confirmation data and investigate the nature andextent of contamination at four newly identified sites (MWH, 2002). The Corps of Engineerscompleted a Feasibility Study (FS) in February 2004 (USACE, 2004a). A Proposed Plan wasdistributed to the public in July 2004 which summarized site conditions, investigation results,and described the remedial alternatives evaluated in the FS (USACE, 2004b).Thirty two monitoring wells were installed throughout the Gambell FUDS during the remedialinvestigation. One well (MW26) was removed upon installation in 1994 due to lack of water, asecond well (MW23) was not constructed. One well (MW16) was removed between the Phase Iand Phase II remedial investigation (1996-1998), a second well (MW24) was removed by MWHduring on site removal actions in 2003. Seven wells surrounding Site 5 (MW 14, 15, 28, 29, 30,31, 32) were decommissioned by Village Safe Water in October 2007. Bristol EnvironmentalRemediation Service, Inc. searched for, removed and properly decommissioned all remainingwells according to ADEC procedures during August 2008 (BERS, 2008). According to fieldobservations, MW5 and MW7 had already been reclaimed by the ocean and were notrecoverable. MW25 and MW27 were flush mounted wells in the vicinity of Site 7 and could notbe located with a metal detector.3.1.1Site 5A Site 5 Decision Document was approved in September 2007 (USACE, 2007). The selectedremedy was no further action. Three additional rounds of well sampling around Site 5 wereconducted prior to the selection of the final remedy. There is no unacceptable risk to humanGambell HTRW Project Closeout Report4health and the environment caused by the current or future exposure of a resident tocontaminated soils or groundwater at Site 5.Site 5 is located at the base of Sevuokuk Mountain, northeast of Troutman Lake. Site 5 is theformer tramway corridor that provided access to the radar site on top of the mountain. The sitealso incorporates the current village water supply well at the base of the mountain and anassociated groundwater monitoring well array.Groundwater sampling conducted in 1998 at Site 5 indicated the potential for contamination withpetroleum (diesel) (MW, 1999a). Subsequent sampling of the monitoring wells surrounding thepublic water supply was conducted in 1999 (July, October), 2005 (September), and 2006 (July,August). These groundwater sampling events confirmed the aquifer is not contaminated withpetroleum hydrocarbons above regulatory cleanup levels. There is no evidence of a spill orsource area of contaminated soils. Additional details on the sampling results can be found in theGroundwater Sampling Reports (BCS, 2006a, 2006b, 2007), and the Decision Document(USACE, 2007).The 7 monitoring wells (MW 14, 15, 28, 29, 30, 31, 32) surrounding Site 5 (see Figure 3) werepulled and decommissioned in October 2007, by personnel with Alaska Village Safe WaterProgram.3.2REMEDIAL ACTIONS COMPLETEDThe Decision Document (USACE, 2005) selected a response action for two areas, Sites 7 and 12,based on the presence of contaminants at levels which may pose a risk to human health and theenvironment. The selected remedy was excavation and off-site disposal of contaminated soils.In addition, removal of exposed Marston matting metallic debris was the selected response actionfor Site 8A.3.2.1Site 7Site 7 is located north of the Gambell Municipal Building, and west of the Gambell School. Amilitary power facility was reportedly demolished and buried in this location. A military motorpool building was also believed to be located in this vicinity. Montgomery Watson removed allexposed surface debris in 1996. During 2003, MWH removed the concrete pad, underlyingsupport timbers, a buried 55-gallon drum, and 1 cubic yard of incidental contaminated soils(MWH, 2004). Soil confirmation samples collected from beneath the removed concrete pad andsupport materials indicated arsenic contamination was still present.A Feasibility Study was completed by USACE in 2004 which evaluated a range of remedialalternatives. A Decision Document (USACE, 2005) selected the final remedy as excavation andoff-site disposal of arsenic-contaminated soils at Site 7. During the summer of 2006, BristolConstruction Services (BCS) excavated an area approximately 10 by 20 feet and removed 6.93Gambell HTRW Project Closeout Report5tons of arsenic-contaminated soils from Site 7 (see Figure 4). The soil was transported to apermitted disposal facility in Arlington, Oregon. Soil confirmation samples were collected fromthe base of the excavation and all the results were below the site-specific cleanup level.Additional details regarding the removal action are presented in the Soil and Debris RemovalAction Report (BCS 2007b).3.2.2Site 8ASite 8A is located along the eastern edge of the airport runway. The Marston matting at Site 8Awas abandoned in place when the military demobilized from the area in the late 1950s. Thedebris posed a clear danger to local residents who frequently traverse the area on all-terrainvehicles (ATVs) and snowmachines due to the sharp and jagged edges which protrude above theground surface and create a navigation hazard during the winter. In 1999, OSCI removed somesurface debris from Site 8A, including scattered metal, small quantities of wood and concrete,and an exposed layer of Marston matting. However, the planned removal of the Marston mattingwas not completed because buried electrical lines prevented safe implementation of the fieldactivities.BCS completed the removal of Marston matting debris and old partially buried drums during thesummer of 2006. A total of 58.6 tons of metallic debris was removed and shipped offsite forrecycling. Approximately 14 drums were present within a 20 by 20 foot area. The drums werecrushed and initially thought to be empty. However upon arrival at the scrap metal recyclingfacility, it was discovered that some drums had a small amount of residual tar. The drums wereproperly disposed by General Environmental Management, Inc., in November 2006. Fieldscreening of the soil beneath the drums was conducted using a photoionization detector (PID)and did not indicate the presence of contamination. Three soil confirmation samples were alsocollected and analyzed for metals, gasoline range organics, diesel range organics, and residualrange organics. No contaminants exceeded site cleanup levels. Additional details are presentedin the Soil and Debris Removal Action Report (BCS 2007b).3.2.3Site 12Site 12 is located north of Nayvaghat Lakes on the southwest side of an ATV trail. The site isdivided into a north and a south area. The area south of Troutman Lake is within the City ofGambell boundary. The area is currently used primarily for recreation, subsistence foodgathering, and as a gravel borrow source. However, this site has the potential to be developedfor residential use in the future, given the flat topography and close proximity to a new drinkingwater source.In 1999, OSCI removed contaminated soil and debris from the site including drums, dried paint,and batteries from large vehicles consistent with former military use (OSCI, 2001). OSCIremoved 798 pounds of miscellaneous metal debris; 7,104 pounds of drums; 1,598 pounds ofRCRA hazardous materials (lead contaminated soil, lead acid batteries, and lead paint); andGambell HTRW Project Closeout Report67,237 pounds of petroleum-stained soil associated with the drums.Soil confirmation samples and a supplemental remedial investigation conducted in 2001 (MWH,2002) indicated soils remained with chromium and lead contamination. A Feasibility Study wascompleted by USACE in 2004 which evaluated a range of remedial alternatives. A DecisionDocument (USACE, 2005) selected the final remedy as excavation and off-site disposal ofchromium and lead contaminated soils at Site 12. During the summer of 2006, BristolConstruction Services (BCS) excavated an area approximately 10 by 20 feet and removed 7.0tons of chromium and lead contaminated soils from Site 12 (see Figure 5). The soil wastransported to a permitted disposal facility in Arlington, Oregon. Soil confirmation sampleswere collected from the base of the excavation and all the results were below the site-specificcleanup level. Additional details regarding the removal action are presented in the Soil andDebris Removal Action Report (BCS, 2007b).4.0HIGHLIGHTS OF COMMUNITY PARTICIPATIONThe USACE, Alaska District coordinated all community relations activities and ensured that thelocal community was informed about project-related activities and status by conducting periodicpublic meetings. A Restoration Advisory Board (RAB) comprised of concerned citizens ofGambell, Savoonga, Nome, and Anchorage was formed in 2000 and continues to meet 2 to 3times per year. Subsequent RAB meetings 1 were held to update the community on ordnanceawareness, hazardous and toxic waste remediation activities in Gambell and Northeast Cape, andother building debris and demolition removal work.5.0CONCLUSIONAll identified hazardous/toxic/radioactive wastes (HTRW) have been removed from the GambellFUDS. Contaminated soils were excavated and removed at various locations across the site. Allmonitoring wells installed during the remedial investigations have been searched for and properlydecommissioned to the extent practicable. There is no evidence of any additional hazardoussubstances based on previous military use of the area. The DoD has completed all necessaryremedial actions at the Gambell FUDS. No further DoD actions are necessary at this site.1RAB meetings were held January 15, 2004 (Savoonga); March 31, 2004 (Gambell); September 9, 2004(Savoonga); February 1, 2005 (Gambell); June 1, 2005 (Savoonga); September 15, 2005 (Gambell); January 25,2006 (Savoonga); July 18, 2006 (Gambell); January 25, 2007 (Gambell), July 24, 2007 (Savoonga); January 8, 2008(Savoonga); June 25, 2008 (Savoonga).Gambell HTRW Project Closeout Report76.0REFERENCESBristol Construction Services, LLC (BCS). 2006a. Groundwater Monitoring Report, GambellFUDS Remedial Action, Gambell, Alaska. Revision 1. February.BCS. 2006b. July 2006 Groundwater Sampling Report. Gambell FUDS Remedial Action,Gambell, Alaska. Revision 1. December.BCS. 2007a. August 2006 Groundwater Sampling Report. Gambell FUDS RemedialInvestigation, Gambell, Alaska. Final. May.BCS. 2007b. Gambell FUDS Remedial Action, Soil and Debris Removal Action Report.Revised Final. September.Bristol Environmental Remediation Services, Inc. (BERS). 2008. Technical Memorandum,Monitoring Well Decommissioning Report, Gambell, Alaska. September.Montgomery Watson (MW). 1995. Remedial Investigation, Gambell, St. Lawrence Island,Alaska. January.MW. 1997. Debris Inventory Update, Gambell, St. Lawrence Island, Alaska. October.MW. 1998. Phase II Remedial Investigation, Gambell, St. Lawrence Island. Final. December.MW. 1999a. Remedial Investigation, Groundwater Sampling, Site 5, Gambell, St. LawrenceIsland, Alaska. March.MW. 1999b. Phase II Remedial Investigation, Site 5, Gambell, St. Lawrence Island, Alaska.Final. May.MW. 1999c. Remedial Investigation, July 1999 Groundwater Sampling, Site 5, Gambell, St.Lawrence Island, Alaska. December.MW. 1999d. Remedial Investigation, October 1999 Groundwater Sampling, Site 5, Gambell,St. Lawrence Island, Alaska. December.Montgomery Watson Harza (MWH). 2002. Summary Report, 2001 Supplemental RemedialInvestigation, Gambell, St. Lawrence Island, Alaska. Final. May.MWH. 2004. Gambell NALEMP Removal Action Report, Gambell, St. Lawrence Island,Alaska. Final. February.Native Village of Gambell. 2008. Gambell NALEMP Cleanup Summary Report. Gambell, St.Lawrence Island, Alaska. In association with Travis/Peterson Environmental Consulting,Inc. February.Gambell HTRW Project Closeout Report8Oil Spill Consultants, Inc. (OSCI). 2001. Remedial Action Report for Debris Removal andContainerized Hazardous Waste and Toxic Waste Removal, Gambell, Alaska. Final.February 15.United States Army Corps of Engineers (USACE). 2004a. Feasibility Study, Gambell, St.Lawrence Island, Alaska. February.USACE. 2004b. Proposed Plan for Remedial Action, Gambell Formerly Used Defense Site, St.Lawrence Island, Alaska. July.USACE. 2005. Decision Document, Gambell Formerly Used Defense Site F10AK0696, St.Lawrence Island, Alaska. June.Gambell HTRW Project Closeout Report97.0FIGURES'0"NORTON//,,/,//SoutheastCape".,>1.::p created withv.ith 1tPOIO©20J4 NationalNatio:::n:l GeograpHcGecgcphcvlap~ @2004173°03'00" W171°53'00" W170°43'00" WNATIONALGEOGRAPHICS.n169°33'00" W25168°23'00" W"25, 50sp'"75167013'00" W757,5100125166°03'00" W164°53'00" WWGS84161031'OO" VrnF100Itp mlesmdes150175 km06/20/0Figure 1 – Site Vicinity MapGambell HTRW Project Closeout Report10Figure 2. Gambell Sites Overview238C1C22Sevuokuk Mountain1A1762772625B 25A 16 202624 188B19 2115Troutman Lake234E4A54D118AAirs trip4B1B910Bering Sea4C288D12±N13to14Gambell HTRW Project Closeout Report1000010002000 Feet11Figure 3. Site 5 Monitoring Well locationsLege,,,lLegelld-;j;-+-Monitoring Well()Soil Boring,\\~r£\\'--{~(E~=Gambell HTRW Project Closeout Report~ Spring//"//"/;)'( //"/);'12I~House+"Q" BUildint+,I+++:----_"-- --'-----+~-------~- .....................- ----__-- -__-- -__--..,-I.............-_/I\\.\\'tc----Site 7Soil removal areaII......\City Buildi--.,++/I/+\\') r-::'---) \(-+1\\\I{'-_.----~~:--_:---J+/~/:"\j)+o0Washteriawashl~aIL'-~L,,W+,,~1j--fWate- (w",TreatmentL.0-0>---0,0'''."...".......", ,Feel100 FeetI+Figure 4. Site 7 Soil Removal AreaGambell HTRW Project Closeout Report13++++~+~-,