Division of Spill Prevention and Response

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Site Report: Eielson AFB (OU-2) (DP26) T300 Sludge Pit


Site Name: Eielson AFB (OU-2) (DP26) T300 Sludge Pit
Address: Flightline & Hazmat Yard, Eielson AFB, AK 99702
File Number: 107.38.024
Hazard ID: 367
Status: Active
Staff: Monte Garroutte, 9074512131 monte.garroutte@alaska.gov
Latitude: 64.653324
Longitude: -147.076536
Horizontal Datum:


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

BACKGROUND ST13 (DEC file 107.38.066/Hazard ID 339) and DP26 (DEC file 107.38.024/Hazard 367) are managed together. ST13 included a fuel pump house, approximately 11 large USTs that stored JP-4, diesel and possibly AVGAS or MOGAS, five fuel outlets and an area used for filling and storing fuel bladders. DP26 included truck fuel stands, Tank 300 (a 420,000-gallon AST used for sludge from tank cleaning), ancillary piping and shallow trenches in which tank sludge was spread until 1980. ST13 and DP26 are located at the SE end of the main taxiway. Combined area is approximately 7 acres. Groundwater is 5-9 feet below ground surface. RELEASES Spills at ST13 occurred due to ruptured, leaking and overfilled bladders used to transport diesel and MOGAS by helicopter to remote areas. Spills or leaks (including of leaded fuels used in the 1950s-70s) at DP26 occurred prior to reconditioning Tank 300 and associated underground piping in 1987. The quantity of fuel released is unknown but NAPL and dissolved constituents have been found in GW. REMEDIATION Tank 300 was replaced and petroleum-impacted soil within the containment berm was excavated to groundwater and replaced with clean fill in 1987. A 1994 fuel hydrant system upgrade included removal of 10,250 cubic yards of soil, replacement of 4,000 feet of new utilidor and removal of 11 USTs. In 1995 six product recovery wells and a bioventing system were installed. The bioventing system was upgraded in 2005 and shut down in 2008. MOST RECENT ACTIONS Limited groundwater monitoring in 2007 detected benzene concentrations up to 12 ug/L. Additional site characterization is scheduled for 2011. ASSOCIATED SITES SS37 (DEC file 107.38.027/Hazard ID 372) and SS41 (DEC file 107.38.048/Hazard ID 376) are just north (downgradient) of ST13/DP26.



Action Information

Action Date Action Description DEC Staff
1/21/1992 Site Added to Database This site is included in the state EPA Eielson FFA 100.38.011. No Longer Assigned
12/3/1992 Update or Other Action Received documents from EAFB on OU 3,4 and 5. These documents are the quality-assured field sampling data. Markey is now reviewing them. Item # 35 and 36, from the CS/DOD bookcase. 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
5/6/1993 Site Characterization Report Approved (Old R:Base Action Code = FS - Feasibility Study (General)). Received draft FS from EAFB. The 3 volume document contains the FS and also includes Remedial Investigation and 02 appendices. No Longer Assigned
5/6/1993 Update or Other Action (Old R:Base Action Code = RI - Remedial Investigation). Received draft RI from EAFB. The 3 volume document contains the RI and also includes Feasibility study and 02 appendices. No Longer Assigned
10/19/1993 Site Ranked Using the AHRM Initial ranking. No Longer Assigned
9/30/1994 Institutional Control Record Established When the OU-2 ROD was signed in 1994, 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
1/16/1996 Update or Other Action Received Conceptual Site Model Memorandum, OU-2 Source Areas ST13 and DP26 Treatability Study, Informal Technical Information Report, Volumes 1 and 2. Kalu Kalu
2/20/1996 Update or Other Action Received "Informal Technical Information Report, Source Areas ST13/DP26. Volumes 1, 2 and 3. Kalu Kalu
8/1/1996 Update or Other Action Work Plan for Utilidor Investigation/Treatability Study, Contract Number DACA85-94-D-0011, Delivery Order Number 0009, Submittal 001-Draft, received 8/16/1996. Kalu Kalu
8/1/1996 Update or Other Action (Old R:Base Action Code = RD - Remedial Design). Amendment 002, Site Health and Safety Plan, Remedial Design for OU-2, Sites ST10/SS14 and ST13/DP26, Utilidor Investigation/Treatability Study, Contract DACA85-94-D0011, Delivery Orders 0007 and 0009, received 8/16/1996. Kalu Kalu
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
12/20/2001 Cleanup Plan Approved Site is undergoing active remediation via bioventing. The system was designed primarily to treat the soil by increasing biodegradation and has been operating since 1997. 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
1/21/2003 Update or Other Action Site is still undergoing active bioventing. The 5-year review is scheduled in 2003 to evaluate cleanup progress. 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
5/20/2004 Meeting or Teleconference Held Staff participated in a teleconference with Eielson Air Force Base regarding their plans for this field season and the polychlorinated biphenyls (PCBs) in Garrison slough. In 2004, they plan to upgrade the bioventing system at the ST10/SS14 tank farm site and do further delineation at the ST13/DP26 hazmat facility. Additionally, they will continue with the sitewide monitoring program. The results from the fish tissue sampling in Garrison Slough indicates that the fish are still accumulating unacceptable levels of PCBs. The Air Force agreed to complete a limited feasibility study in 2004 to evaluate further remedial alternatives for this site. Ann Farris
5/20/2004 Long Term Monitoring Established This site is included in the long-term monitoring program. Monitoring is concurrent with ST13. Monitoring will occur in 2004 and 2007. Emily Youcha
10/11/2004 GIS Position Updated Coordinates acquired by Emily Youcha using a hand-held GPS during a site visit. Torsten Ernst
12/20/2004 Meeting or Teleconference Held Staff attended a meeting with the Air Force to get an update on certain sites. The bioventing system at this site will be upgraded in summer 2005. Emily Youcha
6/24/2005 Update or Other Action The bioventing system at ST13/DP26 will be upgraded in 2005 with new air injection points and soil vapor monitoring points. The new air injection points will be screened from the lower vadose zone and into the water table to further enhance remediation. Operation and maintenance checks and respiration testing will be performed on the bioventing system and the product recover system will be operated continuously. Emily Youcha
6/24/2005 Update or Other Action Staff received the 2004 Sitewide Monitoring Report results. It was determined that contamination associated with ST13/DP26 is not the same source of contamination found nearby site SS37. Lead concentrations exceed the MCLs in the Technical Impracticibility (TI) waiver area, but outside the TI waiver area, concentrations are below the MCL. Benzene concentrations remain above the MCL and extends downgradient to Inner Loop Rd. Emily Youcha
11/22/2005 Meeting or Teleconference Held A meeting was held with the EPA and Eielson AFB. Ground-water monitoring will continue with the next measurement in 2007. 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
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
3/6/2008 Exposure Tracking Model On Hold This site was ranked in conjuntion with ST13. ST13 and DP26 have been handled together in the ROD and previous investigations. Any groundwater contamination from DP26 appears to be commingled with contamiantion from ST13. The source suspected at DP26 (buried sludge) was not found during Remedial Investigation work. Janice Wiegers
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
2/3/2011 Meeting or Teleconference Held Contaminated Sites staff met with representatives from Eielson AFB, Eielson's contractor, EPA and EPA's contractor to discuss Installation Restoration Program sites ST10/SS14 and ST13/DP26. GIS maps and site summaries were used to review historical information and identify data gaps, primarily pertaining to questions about whether soil contamination is still contributing to benzene contamination in the groundwater. Eielson personnel agreed to provide the Remedial Investigation/Feasibility Study (RI/FS) as well as any tank removal reports that can be located so that informed decisions can be made regarding future actions at these sites. A follow-up meeting was scheduled for next week. Kathleen Beutel
4/8/2011 Meeting or Teleconference Held A site scoping meeting for ST13/DP26 was held. Eielson's contractors created an annotated map and technical memorandum that summarized historic data, identified data gaps and described proposed field activities, including aquifer evaluation, soil borings and vertical and horizontal groundwater plume delineation. A work plan for ST13/DP26 will be included in the basewide UFP-QAPP to be submitted 22 July 2011. Kathleen Beutel
5/7/2013 Site Visit Site visit conducted in preparation for the Five Year Review. Workers were inspecting tank 4. No change in landuse was noted. Further site characterization is planned at this site this summer. Kim DeRuyter
2/11/2014 Report or Workplan Review - Other 2012-Final installation-wide monitoring program (IWMP) report received June, 24 2013. During the 2012 season four monitoring wells were installed at ST13/DP26. Two of these wells replaced historic wells that had been decommissioned and two were installed in new locations. 14 wells (4 new and 10 existing) were sampled, five COCs (Contaminant of concern) benzene (3 wells), ethylbenzene (1 well), toluene (2 wells) 2-methylnapthalene (1 well), and lead (1 well) exceeded the final remediation goal. 3 COPC (Contaminant of potential concern) Petroleum Hydrocarbons-GRO (2 wells) DRO (2 wells), PAHs (Polycyclic aromatic hydrocarbons)-1-methylnaphthalene (1 well) and VOCs (Volatile organic compound) - EDB (2 wells) were detected in levels that exceeded current MCL (Maximum contaminant level) or ADEC groundwater levels. In general, based on the comparison between the 2012 and historical concentrations, and plume extents, groundwater contamination of contaminants of concern have demonstrated an overall decreasing trend, which results in a decline of 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 benzene, toluene and lead. Results of analyses performed in 2012 indicated a slightly more westerly extent for the benzene plume; results of further monitoring will be used to confirm this. Anna Iverson
3/4/2014 Conceptual Site Model Submitted The AF submitted Conceptual Site Model Update (Draft) for sites ST13/DP26. Received 1/14/14. Soil and groundwater were sampled and analyzed for DRO, GRO, RRO and VOCs additionally groundwater was also sampled for EDB. At least 1 sample from each of the 20 (2 taken from each boring) soil borings exceeded screening levels for one or more analytes of GRO, DRO, and VOCS. RRO were detected below screening levels in 39 of 40 samples. Groundwater sampling showed no samples above screening levels for ROR, and 8 of 15 samples should concentration lower then screening level for EDB. DRO and GRO exceeded screening levels in 5 and 8 out of 15 samples respectively. Results confirm that levels of fuel-related compounds and some chlorinated compounds still exceed cleanup levels in both soil and groundwater, although the extent of the historical plume has diminished substantially. Anna Iverson
3/4/2014 Conceptual Site Model Submitted The AF submitted Conceptual Site Model Update (Draft) for sites ST13/DP26. Received 1/14/14. Soil and groundwater were sampled and analyzed for DRO, GRO, RRO and VOCs additionally groundwater was also sampled for EDB. At least 1 sample from each of the 20 (2 taken from each boring) soil borings exceeded screening levels for one or more analytes of GRO, DRO, and VOCS. RRO were detected below screening levels in 39 of 40 samples. Groundwater sampling showed no samples above screening levels for ROR, and 8 of 15 samples should concentration lower then screening level for EDB. DRO and GRO exceeded screening levels in 5 and 8 out of 15 samples respectively. Results confirm that levels of fuel-related compounds and some chlorinated compounds still exceed cleanup levels in both soil and groundwater, although the extent of the historical plume has diminished substantially. Anna Iverson
5/1/2014 Report or Workplan Review - Other 2013-Draft installation-wide monitoring program (IWMP) report received March, 26 2014. During the spring 2013 monitoring event, 12 monitoring wells were sampled (11 in spring) at ST13/DP26. Four of these wells are located within the source area, two are up-gradient, one is cross-gradient, and five are down-gradient of the source. 3 COCs exceeded the ROD FRGs, Benzene (1 well spring and 2 wells both sampling events), Lead (1 well both sampling events), and Toluene (1 well fall). 3 COPCs exceeded current MCL (Maximum contaminant level) or ADEC groundwater levels for GRO (1 well spring and 1 well both sampling events), DRO (1 both sampling events), EDB (1 well both sampling events, 1 well fall). Anna Iverson
6/10/2015 Site Characterization Workplan Approved Approval issued for the "Final Workplan for Additional Well Installations, Eielson Air Force Base, Alaska" dated 26 May 2015. The workplan describes the installation of 20 new monitoring wells at ten source areas (i.e. ST10/SS14, ST13/DP26, ST18, ST19, DP44, SS61, SS37, ST58, LF04, and SS534)across Eielson, as well as the redevelopment of drinking water well NWS56WH at Source Area ST56 (Engineer Hill). Melinda Brunner
3/26/2016 Update or Other Action DEC and EPA reviewed the "Draft Remedial Investigation/Feasibility Study Management Plan for Operable Unit 2 Source Areas, Eielson Air Force Base, Alaska" dated February 2016 (OU2 RI/FS MP) and provided joint comments to the U.S. Air Force. The RI/FS MP provides an overview of the activities associated with the investigation and evaluation of the 27 source areas at Eielson Air Force Base. DP026 is included in the RI/FS MP. 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
12/23/2016 Report or Workplan Review - Other DEC and EPA approved the OU2 RI/FS Management Plan. The RI/FS MP provides an overview of the activities associated with the investigation and evaluation of the 27 source areas (not including Garrison Slough) contained in the ROD that includes seven source areas in OU2 and 21 source areas outside of OU2. Monte Garroutte

Contaminant Information

Name Level Description Media Comments
Benzene Other SoilGroundwater
Lead - Total > Table C Groundwater
TPH > Table C Groundwater
Toluene > Table C Groundwater
Ethylbenzene > Table C Groundwater


Control Type

Type Details
Interagency MOU OU2 Record of Decision
Land Use Plan / Maps / Base Master Plan Basewide IC Plan incorporated into the Base Comprehensive Plan.


Requirements

Description Details
Groundwater Use Restrictions Prohibition on installation of drinking water wells. Any activity that may result in exposure to contaminated ground water or moving contaminated ground water requires approval of 354 CES/CEV. Annual IC Report
Groundwater Monitoring Site is included in the Sitewide Monitoring Program. A requirement that all monitoring wells are secured with locks. Sitewide Monitoring Program Report
New Construction Restrictions Any activity disturbing a remedial action requires approval of 354 CES/CEV Annual IC Report
Excavation / Soil Movement Restrictions Any activity that may result in exposure to or removal of contaminated soil requires approval of 354 CES/CEV Annual IC Report
Excavation / Soil Movement Restrictions If contaminated soil or ground water are removed from the source, they must be disposed of or treated in accordance with regulation. 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. Notify ADEC and EPA

There are no documents for this site report.