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Site Report: Eielson AFB (OU-1) (ST020) Refueling Loop

Site Name: Eielson AFB (OU-1) (ST020) Refueling Loop
Address: E-7, E-8 & E-9 Complexes, Eielson AFB, AK 99702
File Number: 107.38.069
Hazard ID: 346
Status: Active
Staff: Axl LeVan, 9074512156 axl.levan@alaska.gov
Latitude: 64.649041
Longitude: -147.058454
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

Aircraft refueling loop with three complexes: E-7, E-8 and E-9. Each complex includes an asphalt pad with adjacent areas of gravel and grass. Each complex has its own pump house (E-7: Bldg 1315, E-8: Bldg 1321, E-9: Bldg 1305), three 50,000-gallon USTs, one 25,000-gallon defueling UST and underground fueling and defueling lines. Groundwater is approximately 3-9 feet below ground surface. The large area enclosed by the taxiway loop north of E-7 contains surface water ponds. Garrison Slough is approximately 1,000 feet from E-7. Contamination is thought to be due to a variety of spills and leaks. Floating product up to 30-cm thick was measured above shallow groundwater at each of the three complexes. E-7: JP-4 leaks in subsurface fueling and defueling transfer pipes E-8: JP-4 surface spills from overfilling storage tanks E-9: (1) "extensive" leak detected Aug 1988, repairs Jun 1989, amount unknown; (2) leak on tarmac detected and repaired Jun 1989, amount unknown; (3) Leak in line to defueling tnak detected Jun 1992, repaired Jul 1992, amount unknown. Bioventing systems at E-7 and E-9 were used from 1991-2002. E-7 and E-8 were last monitored in 2002. Benzene at E-7 remains at concentrations up to 82.9 ug/L in groundwater. E-8 has benzene up to 46 ug/L. E-9 was most recently monitored in 2007. Several monitoring wells at E-7 and E-9 have shown fluctuations. 2011 field work will include further soil and groundwater site characterization. The Type III Hydrant Refueling System is a large compliance restoration site (DEC file 107.38.106/Hazard ID 4394) that encompasses ST20. This site also includes spill no. 17309906903; spill date = 3/10/17; substance = unknown; quantity = unknown; source = unknown; location = parking lot west of bldg. 1306, 64.650771, -147.056538, WGS84; PPRP file no. 107.02.004. Description: contamination discovered via field screening during geotechnical work (PID 50ppm in soil at 2.5 feet bgs). Soil cuttings were placed in drum #9129 and stored at LF003 pending analysis. Proposed COCs (Soil): GRO DRO Benzene Ethylbenzene 1,2-Dichloroethane 1,2,4-TMB 1,3,5-TMB Toluene Xylenes Benzo(a)anthracene Benzo(a)pyrene Benzo(b)fluoranthene Dibenzo(a,h)anthracene 1-Methylnaphthalene 2-Methylnaphthalene Naphthalene Proposed COCs (Groundwater): GRO DRO Benzene Ethylbenzene TCE 1,2,4-TMB 1,3,5-TMB Toluene Xylenes Benzo(a)anthracene Benzo(a)pyrene Benzo(b)fluoranthene 1-Methylnaphthalene 2-Methylnaphthalene Naphthalene Aluminum Antimony Arsenic Iron

Action Information

Action Date Action Description DEC Staff
1/16/1992 Site Added to Database This site is included in the state EPA Eielson FFA 100.38.011. Former Staff
7/29/1992 Update or Other Action Confirmed presence of floating product (hydrocarbons) and contaminated soils at E-8 and E-9) and TPH exceeded at E-8. PCB found in soil sample E-7. Benzene 481 ug/l exceeds MCL/ARAR /PMCLG of 5ug/l. BTEX in groundwater in excess of ARAR at all 3 locations. Former Staff
8/21/1992 Update or Other Action (Old R:Base Action Code = DD - Decision Document (CERCLIS)). Met with Eielson (Sam Gibboney), regarding ARARS for OU1B. Record of Decision. Rielle Markey
8/24/1992 Update or Other Action (Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Reviewed workplan for removal of NAPL. EA document. Rielle Markey
8/25/1992 Meeting or Teleconference Held Discussed additional activities in conference call - more product probes to determine extent of floating product. Rielle Markey
9/2/1992 Meeting or Teleconference Held Meeting by RPMs for discussion of ARARs. Former Staff
9/23/1992 Site Ranked Using the AHRM Initial ranking. Former Staff
9/25/1992 Update or Other Action (Old R:Base Action Code = DD - Decision Document (CERCLIS)). State signature on ROD for removal of floating product as an interim action. Former Staff
11/12/1992 Update or Other Action (Old R:Base Action Code = CORR - Correspondence (General)). 2 hour call. 1ST Scoping of OU1 draft RI to be continued 11-18. Rielle Markey
11/17/1992 Meeting or Teleconference Held 2 hour conference call resolving ROD alternatives workplan and remedial action workplan dates and issues. Rielle Markey
11/18/1992 Meeting or Teleconference Held 2 hour conference all resolving scoping issues for OU1-Management Plan due 1/15/93. Rielle Markey
11/20/1992 Update or Other Action (Old R:Base Action Code = CORR - Correspondence (General)). Letter sent initiating dispute on site 48 for dates of ROD and R action plan. Rielle Markey
12/7/1992 Meeting or Teleconference Held (Old R:Base Action Code = PUBP - Public Participation)). Public meeting at NP High School 7-9 PM. Former Staff
12/7/1992 Meeting or Teleconference Held (Old R:Base Action Code = PUBP - Public Participation)). Technical Review committee meeting. Former Staff
12/9/1992 Update or Other Action (Old R:Base Action Code = PUBP - Public Participation)). Reported Mr. Hank Wojcicki (488-2644) requested information regarding water testing of the CAC water supply well. He additionally reported dumping of paint removal wastes near the back of hanger 1348. Rielle Markey
2/9/1993 Update or Other Action (Old R:Base Action Code = RD - Remedial Design). 35% Design document received for ST20 E7. This document is the annual report for the bioventing project. Former Staff
2/10/1993 Update or Other Action (Old R:Base Action Code = RD - Remedial Design). Received 60% Design document for NAPL Recovery Project to satisfy interim action 1B. Rielle Markey
2/23/1993 Update or Other Action (Old R:Base Action Code = RPL2 - Site Information Request Letter). Sent PRP-CS database Notification Letter to RP requesting update and more environmental information concerning contaminated site. Department of the Air Force responded with update of requested site information on 3-17-93. Jeff Peterson
3/19/1993 Update or Other Action (Old R:Base Action Code = DD - Decision Document (CERCLIS)). Sent review comments on 60% Design for OU-1B NAPL Recovery Project Decision Document. Rielle Markey
3/23/1993 Site Characterization Workplan Approved (Old R:Base Action Code = MP - Management Plan (CERCLIS)). Received Schedule for OU-1. will discuss in a conference call on 3-24. Rielle Markey
10/18/1993 Site Ranked Using the AHRM Initial ranking. Former Staff
9/30/1994 Institutional Control Record Established When the OU-1 ROD was signed, it established institutional controls for this site. These ICs include: a prohibition on the installation or use of drinking water wells, a requirement that all monitoring wells are secured with locks, any activity that may result in exposure to contam. g.w. or moving contam. g.w. requires approval of CES/CEV, any activity disturbing a remedial action requires approval of CES/CEV, any activity that may result in exposure to or removal of contam. soil requires approval of CES/CEV, if contam soil or g.w.. are removed from the source, they must be disposed of or treated in accordance with regulation, and a requirement to notify ADEC and EPA of any proposal to change the existing land use or land use controls at the site. Ann Farris
9/24/1996 Cleanup Plan Approved Remedial action consists of bioventing and free product recovery. Emily Youcha
9/24/1996 Record of Decision Final Site-Wide Record of Decision, September 1, 1996, Environmental Restoration Program (QTRLOG). Rielle Markey
3/24/1997 Update or Other Action Site updated by Shannon and Wilson, based on the Air Force Relative Risk Evaluation Worksheet dated 10/19/95. S&W
1/21/1998 Update or Other Action Staff name changed from Kalu to Short. Bioventing pilot study ongoing at two sites: ST20 and ST48. Ronan Short
12/3/2001 Update or Other Action Bioventing ongoing, but part of the remedial process optimization study. Soil gas sampling and soil sampling completed in 2001 to determine if systems can be shut off. Awaiting results. Ann Farris
12/26/2001 GIS Position Updated Worked with Heather Goldman obtaining GIS latitude and longitude from 1:63,300 topographic map. Heather Goldman
8/27/2002 Update or Other Action Staff met with EPA, AF, and RPO team to discuss results of 2001 sampling. Soil gas and soil sampling indicated the soil was clean at E-7, with the exception of one small area. We agreed to shut down the bioventing system at E-7. At E-9 there was a larger area that was still contaminated, but it is questionable whether the existing bioventing system can treat the area. We agreed to leave the system operating until the results of 2002 groundwater sampling event are in. If those results show the plume is stable, then the system can be shut off and the remedy will be natural attenuation. Ann Farris
9/19/2003 Meeting or Teleconference Held Staff attended a meeting with Air Force and EPA personnel to resolve comments on the draft Eielson Five-Year Review. Issues with the document included event-driven groundwater sampling at several contaminated sites, which we denied pending further clarification of the process, and closing numerous sites under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), but keeping them open under the State until 18 AAC 75 diesel range organic cleanup levels are met. Ann Farris
1/9/2004 Update or Other Action Staff is reviewing the draft final Five-Year Review for Eielson Air Force Base. The majority of ADEC’s comments on the original draft document have been addressed. There are a few items that are still not satisfactory, but staff expects to get resolution on these items in the next week and have a document ready for signature by the end of the month. Ann Farris
1/28/2004 Update or Other Action The Five-year review was completed and approved by all three parties. ADEC agreed to the Air Force decommissioning the bioventing systems. The groundwater will continue to be monitored as part of the sitewide monitoring program and institutional controls will remain in place. Ann Farris
7/19/2004 Update or Other Action Bioventing systems have been decommissioned. Ann Farris
7/19/2004 Long Term Monitoring Established Site is included in the Sitewide Monitoring Program. Next monitoring will occur in 2005 at E7 and E9. E8 has been closed under CERCLA, however, site will not be closed under 18 AAC 75 until confirmation DRO/GRO samples are collected indicating ground water and soil is clean. Emily Youcha
7/28/2005 Update or Other Action Long-term ground-water monitoring was scheduled for 2005, but will be postponed until 2006 due to construction and re-paving at the site. Emily Youcha
3/1/2006 Update or Other Action Staff had a telephone call with Eielson AFB to discuss their long-term monitoring program optimization. Eielson would like to apply "event-driven monitoring" to many benzene-contaminated sites, where monitoring would occur when the concentration reached the MCL at a predicted time. They are using MAKSENS to do the statistical regressions and come up with a slope indicating benzene degradation rates. This slope would predict when the concentrations would reach the MCL and monitoring would occur at that time only. They would like to apply this slope to other "similar sites" to predict when the concentrations would reach the MCL. Eielson submitted the concept to AFCEE for review, but apparently AFCEE requested more data, which Eielson did not have. At this point, DEC has not reviewed any data on this concept and requested Eielson submit a report showing the data and justification of their assumptions. Emily Youcha
7/6/2006 Update or Other Action ADEC agreed to decrease sampling of the North Boundary Wells from annual sampling to biennial. Upcoming measurements will be summer 2007, 2009, 2011, etc. Concentrations of VOCs, SVOCs, and metals in the sentinel wells have been monitored annually since 1992 and there has been no detection of contamination. Emily Youcha
8/8/2006 Update or Other Action Samples were not collected in 2006 due to continued construction in this area. Samples should be required for summer 2007. Emily Youcha
9/20/2006 Update or Other Action Staff received a report from Nortech who worked on the environmental sampling during construction of the new taxiway at ST20. Widespread contamination was discovered in areas ouside of the E7, E8, and E9 fueling stations, but it is likely to be part of the entire fuel hydrant system. Two new additional spills were reported to PERP during the project. Staff met with PERP, Eielson, the Army Corps, and their contractors to discuss the contamination. It is unknown where the excavated contamination went, but it is highly likely it went back into the ground. ADEC staff was not involved in the sampling and analysis plan for this project, apparently the EPA project manager was involved. During the 5-year ROD review in 2008, I recommend that the site boundaries are better defined based on the new results. Emily Youcha
10/4/2006 Update or Other Action Staff received a request to treat a 2002 stockpile of petroleum contaminated soil from ST20 E8. The soil was from a 50 gallon spill at the pumphouse of JP8. About 20 cubic yards were dug up and placed in the CERCLA stockpile. Soil is likely compliance plus CERCLA soils. Soil was stockpiled and Eielson didn't have funding to treat it. The soil is contaminated with petroleum only but no lab reports are available (based on the COCs at the site, BTEX and DRO/GRO/RRO are the only COCs). I will approve treatement at OIT. Emily Youcha
9/25/2007 Meeting or Teleconference Held Contaminated Sites staff participated in a facilitated three-party meeting with the Air Force and Environmental Protection Agency (EPA) covering the environmental restoration at Eielson Air Force Base. The meeting was held in Seattle at the EPA Region 10 office. CS and the facilitator called for the meeting due to poor communication between the three parties and growing disagreements on matters fundamental to regulatory oversight on Eielson. Initially, each of the three parties was given an opportunity to talk generally about their involvement with the work at Eielson and their concerns. This lead to discussions of the Federal Facility Agreement (FFA) between the parties for base, as it appears that each party interprets specific sections of the FFA differently. Other topics discussed included the applicability of Freedom of Information Act exclusions applied to draft documents submitted to DEC, Eielson's plans for changing the frequency of groundwater monitoring for selected contaminated sites, vapor intrusion as a pathway to reconsider in the upcoming five-year review of records of decision, challenges posed by enforcing institutional controls as part of site remedies, and spill reporting coordination with DEC. Deborah Williams
10/9/2007 Exposure Tracking Model Ranking Completed a preliminary ranking for ST20. There were three source areas defined at E-7, E-8, and E-9. Deborah Williams
7/14/2008 Meeting or Teleconference Held ADEC participated in Eielson's 5 year ROD Review with EPA and Eielson. The sites covered in the ROD Review were the following: ST20, ST48, SS50-52, ST10/SS14, ST13/DP26, DP44, WP45/SS57, ST56, SS61, DP25, ST58, LF03/FT09, WP38 and SS67. Bioventing systems for ST10/SS14 and ST13/DP26 will cease operation during the summer of 2008. ADEC is concerned about LTM issues with SS35 and SS37 because of the potential for spills to be released from buried containerized wastes which are present at both of these sites. The vapor intrusion pathway will be evaluated at many of the sites where there are volatile compounds as a COC at the site and where there are potential receptors. All of these sites will be incorporated into Eielson's Land Use Control plan for the Base and the long term monitoring will be Event Driven Monitoring Program. Deborah Williams
11/24/2008 CERCLA ROD Periodic Review ADEC issued a letter of concurrence on the 2008 Five-Year ROD review for Eielson AFB. In the letter ADEC concurred with the current remedies but recommends further work on the following: the vapor intrusion pathway needs to be evaluated for all potential receptors at WP45/SS57 site along with further evaluation of the selected remedy to ensure the Remedial Action Objectives are going to be met. The buried drums remaining at SS35 may still contain product that may pose a potential risk to ecological and human health risk in the future. The area of buried drums identified outside of SS37 may pose a threat of an imminent release of hazardous substances and warrants further investigation or response action. As stated in the 2008 Five-Year ROD Review, the overall long-term protectiveness determination for the Sitewide OU/Garrison Slough remedy will be further investigated. A Land Use Control Management Plan should be developed and implemented. Deborah Williams
8/14/2012 Site Visit Conducted a site visit to observe well installation at ST20. Two drill rigs were installing monitoring wells in support of the 2012 Installation Wide Monitoring work plan. Both rigs were working at E7. During the visit, one well was placed downgradient of the former pumphouse. Field screening indicated that the soil boring was not contaminated. Another well was placed cross gradient close to the flightline. There was an obvious odor, and PID readings taken from the soil cores indicated that subsurface soil contamination was hottest near the water table with detections up to 690 ppm. Kim DeRuyter
5/7/2013 Site Visit Conducted a site visit in preparation for the Five Year Review. Late season snow still covered the E-7, E-8,and E-9 source areas at this site, but staff located several new monitoring wells. ST-20 is on the refueling loop within the Air Field fence so site acess is restricted. Ducks were observed in the ponded melt water from the late season snow at E-9. Kim DeRuyter
12/19/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78261 E-8 Complex contamination. Site was re-ranked based on IWMP 2012 report. Kim DeRuyter
2/11/2014 Document, Report, or Work plan Review - other 2012-Final installation-wide monitoring program (IWMP) report received June, 24 2013. Remedial actions that have taken place at ST20 since 1988 and remedies have included: NAPL removal through passive skimming; bioventing and soil vapor extraction to remediate soil contamination; and groundwater monitoring. During the 2012 season eighteen monitoring wells were installed at ST20. Fourteen of these wells replaced historic wells that had been decommissioned and four were installed in new locations. Groundwater samples were analyzed and 3 COCs (Contaminant of concern), Benzene, Ethylbenzene, and Toluene exceeded the final remediation goal in wells at both E-7 and E-9 complexes. 3 COPC (Contaminant of potential concern), VOCs (Volatile organic compound), GRO/DRO (Gasoline/ Diesel-range organics), and PAHs (Polycyclic aromatic hydrocarbon) exceeded current MCL (Maximum contaminant level) or ADEC groundwater levels in wells located on both E-7 and E-9 complexes. Based on the comparison between the 2012 and historical concentrations and plume extents, groundwater impacts from contaminant of concerns have decreased, indicating a general decline in contaminant mass. Moreover, comparison of the former plume traces with the 2012 extent of contamination indicates the plumes are shrinking. However, based on the limited data available, additional monitoring is needed to determine contaminant trends for ethylbenzene and toluene in replacement wells 20M04B and 53M04B. Anna Iverson
5/1/2014 Document, Report, or Work plan Review - other 2013-Draft installation-wide monitoring program (IWMP) report received March, 26 2014. There are a total of 21 wells located across the area (E-7 = 8 wells, E-8= 4 wells, E9= 9 wells) 19 of the 21 were sampled during the 2013 spring season, with 2 for E-8 not being sampled due to frozen ground and 21 of the 21 in the fall season. Groundwater samples were analyze and 2 COCs exceeded standards both Benzene and Toulene were both found in exceedence of ROD FRGs for sampling in E-7 (2- fall, and 4-spring), and E-9 (1 fall, and 2-spring). COPC (Contaminant of potential concern) exceeded current MCL (Maximum contaminant level) or ADEC groundwater levels for GRO (2 wells) and DRO (1 well) in E-7 and EDB (1 well), GRO (3 wells), DRO (2 wells), RRO (1 well), and Benzo(a)pyrene (1 well) in E-9. Continued monitoring is needed to further evaluate the contaminant trends on site Anna Iverson
5/21/2015 Site Characterization Workplan Approved DEC and EPA jointly approved the "2015 Installation-Wide Monitoring Program Quality Assurance Project Plan, Addendum No. 4, Eielson Air Force Base, Alaska (Final)" dated May 2015. Activities described in the plan include sampling 27 monitoring wells at ST020 to gauge whether/how the concentration and lateral extent of the known groundwater contamination has changed. The monitoring wells at this site shall be sampled twice in 2015, Spring and Fall, as part of the Installation-Wide Monitoring Program. Melinda Brunner
7/22/2016 Institutional Control Compliance Review DEC and EPA Approved the Final 2016 Installation-Wide Monitoring Program Quality Assurance Project Plan Addendum No. 5. The IWMP QAPP Add. 5 updates the 2012 IWMP QAPP for the 2016 field season. Changes and additions to the existing network of monitoring wells were described. Monte Garroutte
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
6/9/2017 Update or Other Action DEC Approved the 2017 Field Sampling Plan, Eielson Performance-Based Remediation, Eielson Air Force Base, Alaska. John O'Brien
7/18/2017 Document, Report, or Work plan Review - other DEC reviewed and provided comments on the Installation-Wide Monitoring Program, 2016 Groundwater Monitoring Report, Eielson Air Force Base, Alaska (June, 2017). John O'Brien
8/16/2017 Spill Transferred from Prevention Preparedness and Response Program Spill transferred by PPRP staff Jill Stockbridge. Spill no. 17309906903; spill date = 3/10/17; substance = unknown; quantity = unknown; source = unknown; location = parking lot west of bldg. 1306, 64.650771, -147.056538, WGS84; PPRP file no. 107.02.004. Description: contamination discovered via field screening during geotechnical work (PID 50ppm in soil at 2.5 feet bgs). Soil cuttings were placed in drum #9129 and stored at LF003 pending analysis. Mitzi Read
8/6/2018 CERCLA ROD Periodic Review DEC evaluated "Fifth Five-Year Review Report for Eielson Air Force Base, Alaska" draft dated April 2018 and issued comments. Bri Clark
8/9/2018 Document, Report, or Work plan Review - other DEC reviewed and provided a second round of comments on Explanation of Significant Differences (ESD) to the Records of Decisions for Eielson Air Force Base Operable Units, OU1, OU2, OU3,4,5, and OU6, dated November 2017. Bri Clark
8/10/2018 Institutional Control Periodic Reporting DEC and EPA reviewed the "Installation-Wide Monitoring Program 2017 Groundwater Monitoring Program" for Eielson Air Force Base, Alaska dated March 2018 and issued comments. Bri Clark
12/19/2018 Document, Report, or Work plan Review - other DEC reviewed and provided comments on the "Draft Installation-Wide Monitoring Program Quality Assurance Project Plan, Addendum No. 8, Eielson Performance-Based Remediation, Eielson Air Force Base, Alaska," dated November 2018. Bri Clark
2/13/2019 Institutional Control Periodic Reporting DEC and EPA approved the Installation-Wide Monitoring Program 2017 Groundwater Monitoring Report, Eielson Air Force Base, Alaska, dated January 2019. Bri Clark
3/4/2019 Institutional Control Periodic Reporting DEC issued comments on the Draft Installation-Wide Monitoring Program 2018 Groundwater Monitoring Report, Eielson Air Force Base, Alaska, dated January 2019. This report describes the groundwater monitoring activities conducted installation-wide in 2018. Bri Clark
8/23/2019 Site Characterization Report Approved DEC approved the Final Site Characterization Report II, Source areas ST010/SS014, SS012, ST013/DP026, ST015, ST016, ST018, ST019, ST020, WP038, SS039/SS063, SS047, ST048, SS050, SS051, SS052, SS053, AND DP054, Eielson Performance Based Remediation, Eielson AFB, Alaska, dated June 2019. Dennis Shepard
9/30/2019 Document, Report, or Work plan Review - other DEC issued comments on the "Draft Installation-Wide Monitoring Program Quality Assurance Project Plan, Addendum No. 9 Eielson Performance-Based Remediation, Eielson Air Force Base, Alaska", dated August 2019. This program addendum updates the monitoring program originally designed in 2012. Sara Marshall
2/19/2021 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78260 E-7 Complex contamination and E-9 complex. Axl LeVan
5/17/2022 Document, Report, or Work plan Review - other DEC provided comments for the Draft Work Plan, 2022 Installation-Wide Monitoring Program, Eielson AFB, Alaska, Revision 02, April 2022 Eielson Air Force Base, Alaska. The work plan identifies annual sampling requirements for 20 monitoring wells at site ST020. Dennis Shepard
9/20/2022 Document, Report, or Work plan Review - other The U.S. Environmental Protection Agency (EPA) and Alaska Department of Environmental Conservation (DEC) approved the Final 2021 Institutional Controls/Land Use Controls Annual Report, Eielson Air Force Base, Alaska (dated September 2022). The report provides inspection findings and reviews individual ICs established by the record of decision (ROD) documents for Installation Restoration Program source areas with enforceable ICs, as well as other contaminated sites currently with LUCs in effect. Dennis Shepard
11/1/2022 Document, Report, or Work plan Review - other DEC provided review comments for the Draft Supplemental Remedial Investigation (RI) Work Plan (WP) Addendum, Eielson Air Force Base, Alaska, September 2022. The Supplemental RI Work Plan Addendum is prepared with the intention of providing a detailed approach to support the objectives of characterizing contamination in general accordance with the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) and applicable state laws at 29 source areas within Operable Unit (OU) 1, OU2, OU4, and OU6 at Eielson AFB. This supplemental work plan addendum complements the primary planning documents Final Supplemental Remedial Investigation Work Plan Eielson Air Force Base, Alaska (September 2022) (Gaps 1 Work Plan) and the Risk Assessment Work Plan (USAF 2016). Dennis Shepard

Contaminant Information

Name Level Description Media Comments
Benzene > Table C Groundwater
DRO > Table C Groundwater
Toluene > Table C Groundwater

Control Type

Type Details
Interagency MOU OU1 Record of Decision

Requirements

Description Details
Groundwater Monitoring Long-term monitoring through the Sitewide Monitoring Program Annual Sitewide Monitoring Report (monitoring frequency for site varies)
Excavation / Soil Movement Restrictions Any activity disturbing a remedial action requires approval of CES/CEV, any activity that may result in exposure to or removal of contaminated soil requires approval of CES/CEV, if contam soil or groundwater are removed from the source, they must be disposed of or treated in accordance with regulations. Annual IC Report
Restricted to Industrial / Commercial Land Use Requirement to notify ADEC and EPA of any proposal to change the existing land use or land use controls at the site.
Groundwater Use Restrictions A prohibition on the installation or use of drinking water wells Annual IC report
Hazard ID Site Name File Number
4394 Eielson AFB (PL001)Type III Hydrant Refueling System 107.38.106

Missing Location Data

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Phone: 907-465-5066
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