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Site Report: Eielson AFB (SO073) Bldg 6164 Igloo

Site Name: Eielson AFB (SO073) Bldg 6164 Igloo
Address: Building 6164; Engineer Hill Road, Eielson AFB, AK 99702
File Number: 107.38.138
Hazard ID: 26516
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 64.734871
Longitude: -147.046417
Horizontal Datum:WGS84

We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.

Problems/Comments

Source Area SO073 is located at Building 6164 (Facility 1434) on Engineer Hill. Facility 1434 was built in 1957 for the storage of explosive munitions. Contamination sources are suspected to include leaks, spills, and direct discharge from former USTs, ASTs, tank piping, and a condensate drain. Various site investigations have revealed that the substrate at Engineer Hill is geologically distinct from the fluvial soil found at lower elevations elsewhere on the main part of Eielson AFB due to near surface fractured and weathered bedrock. The Engineer Hill substrate is demonstrated to contain concentrations of arsenic well above those seen for the soil types described in the Eielson background study. While high levels of arsenic have been detected at SO073, the concentrations have been determined to be naturally occurring due to the site lithology and the lack of an anthropogenic source. Groundwater is typically encountered at 150-200 feet below ground surface (ft bgs) within the Engineer Hill area of Eielson AFB. During the 2012 Phase 1 Source Evaluation Report (SER) investigation, soil borings were advanced at SO073. This historical release was discovered in June 2012 during sampling for a Phase I Source Evaluation Report investigation of the Engineer Hill sites. The sampling identified benzo(a)anthracene, benzo(a)pyrene, benzo(b)fluoranthene, thallium, arsenic, and chromium in soil in concentrations above the Method Two cleanup levels. Arsenic and chromium concentrations were later attributed to background levels. In 2015, a source area inspection was conducted inside and outside of Building 6164. Two floor drains were identified inside the building; the discharge points were not confirmed during the inspection. No ASTs, UST fill pipes, or vents were identified. In 2016, surface soil samples were collected to the southeast of Building 6164 adjacent to the drainage outfalls, and across Engineer Hill Road. Surface soil samples collected at the drainage outfalls were analyzed for GRO, DRO, RRO, PAHs, and metals. Surface soil samples collected along the parking area and road south of Building 6164 were analyzed for PAHs and metals. One near surface soil boring was advanced adjacent to the 2012 thallium exceedance. The near surface soil sample was analyzed for metals. In 2025 the site was evaluated for closure.

Action Information

Action Date Action Description DEC Staff
3/4/2013 CERCLA PA DEC and EPA provided joint comments to the U.S. Air Force on the "Draft Source Evaluation Report for Multiple Sites at Eielson Air Force Base, Alaska" dated January 2013. The report describes the investigation of 37 sites at Eielson that been reported or suspected of historical contaminant releases or activities that may have affected soil and water at the site. The investigation of SO073 as documented in the report includes a preliminary assessment, as well as sampling results. Sampling at the site identified benzo(a)pyrene, benzo(a)anthracene, benzo(b)fluoranthene, chromium thallium, and arsenic in soil in concentrations above DEC's Method Two cleanup levels. Melinda Brunner
6/12/2013 Update or Other Action DEC and EPA provided joint comments to the U.S. Air Force on the "Draft Final Source Evaluation Report for Multiple Sites at Eielson Air Force Base, Alaska" dated April 2013. The report describes investigations at SO073. Melinda Brunner
6/21/2013 Update or Other Action The U.S. Air Force (USAF) provided a letter dated 21 June 2013 indicating that in response to DEC's and EPA's comments made on the "Draft Final Source Evaluation Report for Multiple Sites at Eielson Air Force Base, Alaska" dated April 2013, the USAF would add a table to the final version of the document that described the SER recommendation for additional action at each site and the USAF selected path forward for each site. The letter indicates the USAF will pursue a remedial investigation/feasibility study at SO073. Melinda Brunner
9/22/2015 CERCLA RI Plan Approved DEC and EPA jointly approved the final "Remedial Investigation / Feasibility Study Management Plan For Non-Operable Unit Source Areas, Eielson Air Force Base, Alaska" dated September 2015 (Non-OU RI/FS MP). The Non-OU RI/FS MP describes planned remedial investigations at 17 contaminated sites at Eielson Air Force Base, including SO073. The Non-OU RI/FS MP is designed to work in concert with the Programmatic Quality Assurance Project Plan; Health and Safety Plan; and site specific Field Sampling Plans. Field work is scheduled to begin at SO073 in 2016. Melinda Brunner
2/5/2016 Site Added to Database A new site has been added to the database Mitzi Read
4/25/2017 Update or Other Action DEC reviewed and provided comments on the Draft Programmatic Quality Assurance Project Plan, Addendum No. 2, Eielson Air Force Base, Alaska (March, 2017). John O'Brien
3/9/2018 Document, Report, or Work plan Review - other DEC issued comments on the Draft Site Characterization Report I Source Areas ST011, SD021, SD022, SD024, DP025, ST027, SS030, ST058, SO065, SO069, SO070, SO071, SO073, SO075, SS078, SS084, SO504, TU506, MY512, and MY518 dated February 2018. Bri Clark
6/25/2018 Document, Report, or Work plan Review - other DEC issued comments on the Draft Site Characterization Report I Source Areas ST011, SD021, SD022, SD023, SD024, DP025, ST027, SS030, ST058, SO065, SO069, SO070, SO071, SO073, SO075, SS078, SS084, SO504, TU506, MY512, and MY518, Eielson Air Force Base, Alaska, dated February 2018. Bri Clark
8/21/2019 Site Characterization Report Approved DEC Approval for the Final Site Characterization Report 1, Source areas ST011, SD021, SD022, SD023, SD024, DP025, ST027, SS030, ST058, SO065, SO069, SO070, SO071, SO073, SO075, SS078, SS084, SO504, TU506, MY512, and MY518, Eielson Performance Based Remediation, Eielson AFB, Alaska, May 2019 Sara Marshall
5/12/2020 Update or Other Action A 2 party draft Decision Document (1 Part A) for Source Areas: SO065, SO069, SO070, SO071, SO073, SO075, SS084, and TU506, Eielson Air Force Base, Alaska, May 2020 was submitted. The sites have no known PFAS contamination associated with them. Any CERCLA contaminants will be addressed under CERCLA regulatory program in accordance with the Eielson Air Force Base, Federal Facilities Agreement. Dennis Shepard
2/9/2022 Update or Other Action DEC approved and signed the Decision Document for Performance Based Remediation Source Areas SO065, SO069, SO070, SO071, SO073, SS084, AND TU506, Eielson Air Force Base, Alaska (May 2021). Decision Document describes the remedial actions at Eielson Source Areas SO065, SO069, SO070, SO071, SO073, SS084, and TU506, all of which are associated with potential contamination resulting from petroleum, storage, distribution, and/or use. The U.S. Air Force (USAF) is managing remediation of petroleum, oil, and lubricants (POL) or petroleum-related contamination at these source areas in accordance with the State-Eielson Agreement (USAF 2014e), the two-party agreement. Any Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) constituents remaining will be addressed by transferring source areas back to the Eielson Air Force Base, Federal Facility Agreement Under CERCLA Section 120 (USAF 2013a), the three-party agreement. Dennis Shepard
8/25/2025 Cleanup Complete Determination Issued DEC has completed a review of the environmental records associated with the Eielson AFB (SO073) Bldg 6164 Igloo located at Facility 1434; Engineer Hill Road in Eielson Air Force Base (AFB). Based on the information provided to date, it has been determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment and no further remedial action will be required unless information becomes available that indicates residual contaminants may pose an unacceptable risk. Sarah Bernhardt

Contaminant Information

Name Level Description Media Comments
2-Methylnaphthalene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Max contaminant conc. remaining in soil 1.9 mg/kg (0.387 mg/kg 95% UCL). MTG pathway determined incomplete.
Benzo(a)anthracene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Max contaminant conc. remaining in soil 5.8 mg/kg (1.151 mg/kg 95% UCL). MTG pathway determined incomplete.
Benzo(a)pyrene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Max contaminant conc. remaining in soil 6.8 mg/kg (1.342 mg/kg 95% UCL). MTG pathway determined incomplete.
Benzo(b)fluoranthene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Max contaminant conc. remaining in soil 7.2 mg/kg (1.455 mg/kg 95% UCL). MTG pathway determined incomplete.
Dibenzofuran Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Max contaminant conc. remaining in soil 1.37 mg/kg J. MTG pathway determined incomplete.
Indeno(1,2,3-cd)pyrene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Max contaminant conc. remaining in soil 3.7 mg/kg (2.153 mg/kg 95% UCL). MTG pathway determined incomplete.
Naphthalene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Max contaminant conc. remaining in soil 5.4 mg/kg (1.055 mg/kg 95% UCL). MTG pathway determined incomplete.
Pentachlorophenol Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Max contaminant conc. remaining in soil 0.19 mg/kg. MTG pathway determined incomplete.
Thallium - Total Other Soil Thallium exceeded DEC’s human health CUL in both surface and subsurface soil samples with a maximum detection of 2.7 mg/kg. However, many of the 2012 thallium results were qualified due to method blank contamination. Based on the qualified 2012 thallium results, the widespread soil detections at similar levels for multiple source areas during the 2012 sampling event (subsequently demonstrated to be uncontaminated during sampling of excavated soil during removal actions), and the absence of similar thallium detections in recent sampling events, thallium was not retained as a contaminant of potential concern at affected sites including SO073.

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70)

No associated sites were found.

Missing Location Data

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