| Action Date |
Action |
Description |
DEC Staff |
| 1/15/1992 |
Site Added to Database |
This site is included in the state EPA Eielson FFA 100.38.011. |
Former Staff |
| 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 |
| 7/15/1993 |
Update or Other Action |
(Old R:Base Action Code = DD - Decision Document (CERCLIS)). Letter in response to Draft RI document. There is a question as to whether this is active or inactive as an EOD area. There are also drums in the valley nearby. |
Rielle Markey |
| 8/15/1993 |
Meeting or Teleconference Held |
Meeting in Seattle to discuss disposition of site. Because of the toxicity of RDX, TNT and lead contaminants, this site will need more consideration, but will not go through the normal FS process. |
Rielle Markey |
| 10/18/1993 |
Site Ranked Using the AHRM |
Initial ranking. |
Former Staff |
| 9/30/1995 |
Update or Other Action |
Eielson AFB Operable Units 3, 4 and 5 ROD includes 20 source areas that have been combined because of commonalities in contamination. These source areas are DP44, WP45, SS57, SS56, S61, P25, T27, P33, S35, S36, S37, S39, S63, T58, SS64, LF02, LF03, FT09, LF04, and LF06. |
Clint Adler |
| 2/16/1996 |
Update or Other Action |
(Old R:Base Action Code = RA - Remedial Action). Received Remedial Action Workplan. |
Clint Adler |
| 4/15/1996 |
Update or Other Action |
(Old R:Base Action Code = RD - Remedial Design). Air Force Comments on Draft Remedial Design for OU-3, 4 and 5. |
Clint Adler |
| 5/10/1996 |
Update or Other Action |
(Old R:Base Action Code = RD - Remedial Design). OU-3, 4, and 5, RDRA Workplan, EAFB. |
Clint Adler |
| 6/28/1996 |
Site Characterization Report Approved |
(Old R:Base Action Code = FS - Feasibility Study (General)). Markey/Adler: Remedial Action Objectives Technical Memorandum, Remedial Action Objectives, OU-5, Feasibility Study, Fort Wainwright, Alaska, Contract DACA85-94-D-008, Delivery Order 0013, received June 28, 1996. |
Rielle Markey |
| 9/24/1996 |
Record of Decision |
Final Site-Wide Record of Decision, September 1, 1996; two documents received. |
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 10/23/95. |
S&W |
| 12/19/2001 |
Long Term Monitoring Established |
Site is in Long-term Monitoring. Staff received Draft 2001 Site-Wide Monitoring Report. Four wells were sampled for GRO, DRO, VOCs, SVOCs, and metals. DRO and Arsenic exceeded MCLs and background levels in all 4 wells. Thallium exceeded the MCL (2 ppb) in one well at a concentration of 2.52 ppb. |
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 |
| 1/15/2002 |
Site Number Identifier Changed |
Changed Workplan from X1 to X9 to reflect presence of a hazardous substance. |
Ann Farris |
| 1/15/2002 |
Site Ranked Using the AHRM |
Changed Toxicity Value from 3 to 4 due to the presence of solvents. |
Former Staff |
| 9/2/2002 |
Institutional Control Record Established |
When the OU-3,4,5 ROD was signed in 1995, it established institutional controls for this site. These ICs include: maintaining the existing access restrictions already in place due to the site being an EOD site. Any construction or other activity that may result in exposure to subsurface soil or groundwater at LF04 will comply with general access procedures outlined in the Base Construction Plan |
Ann Farris |
| 10/1/2002 |
Update or Other Action |
Staff reviewed the 2002 Siteweide Monitoring Report for this site. Historically, metals such as Arsenic, Chromium, and lead have exceeded the MCLs. At certain wells, such as 04M04, 04M03, and 04M01, concentrations have decreased. However, at 04M02, 04M07 arsenic concentrations have increased. In 2002, data was collected from 04M04, 04M01, and 04M08. Results show arsenic below the MCL, however, other wells with arsenic concentrations above the cleanup levels were not sampled. In 04M08, a new push well that was developed without a filter pack, contamination exceeded arsenic, barium, and benzene cleanup levels. |
Emily Youcha |
| 1/21/2003 |
Update or Other Action |
The 5-year review is scheduled in 2003 to evaluate the long-term monitoring trends. |
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 |
| 4/1/2004 |
Update or Other Action |
Staff reviewed the 2003 Sitewide Monitoring Report. Well 04M08 was replaced with a new pushwell, 04M08B, located 8 ft from the original location of 04M08. Benzene was not detected, but arsenic was still detected above the MCL. Arsenic was detected above the MCL in wells 04M01, 04M08B, 04M09. |
Emily Youcha |
| 8/26/2004 |
GIS Position Updated |
Position acquired using "Base MW Map 2004" CAD drawing from EIAFB georeferenced to QuickBird Satellite imagery, NAD27. Also updated Section to 7 from 8. |
Torsten Ernst |
| 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 |
| 10/11/2006 |
Update or Other Action |
Staff reviewed the draft 2006 sitewide monitoring program workplan and the schedule included this site to be monitored for BTEX and metals, but it was not included in the workplan. Staff provided comments. If the site is not monitored in 2006, it should be in 2007. |
Emily Youcha |
| 5/9/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
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 |
| 12/12/2013 |
Document, Report, or Work plan Review - other |
During landfill inspection, area A has debris scattered around, including polyethylene drums, tires, segments of training explosives, and other wastes. There was also an area of distressed vegetation at the location of the debris. Area B contains debris from training exercises and includes spent smoke canisters and bullet casings. There are four shot holes in this area that appear to be still in use with munitions debris centralized around them. |
Kim DeRuyter |
| 3/18/2014 |
Document, Report, or Work plan Review - other |
2012-Final installation-wide monitoring program report received June, 24 2013. During the 2012 season four new monitoring wells were installed. 8 wells were purged and sampled (4 new and 4 existing), lead (1 well) was the only COCs (Contaminant of concern) detected at a concentration exceeding the FRG. However, this elevated lead concentration may be due to elevated turbidity in the sampled groundwater, as the well was pumped dry during purging and allowed to recover 80% before sampling. 3 COPC (Contaminant of potential concern) Petroleum Hydrocarbons-DRO (1 well), Arsenic (17 wells), and Chromium, mercury, and nickel (1 well) were detected in levels that exceeded current MCL (Maximum contaminant level) or ADEC groundwater levels. COCs historically detected at concentrations exceeding the FRGs at Source Area LF04 include benzene and lead. Benzene was not detected in any wells at concentrations above the FRG in 2012. Lead was only detected in one well, but elevated turbidity during sampling could be the result of that. Therefore no new plume data was gathered for this site. DRO, arsenic, chromium, lead, mercury, and nickel were detected at concentrations exceeding the current standards in groundwater in 2012. A background metals study is being completed for the base to allow identification of naturally occurring metals concentrations in groundwater. Following completion of this study, the significance of the metals concentrations detected can be better evaluated |
Anna Iverson |
| 5/1/2014 |
Document, Report, or Work plan Review - other |
2013-Draft installation-wide monitoring program (IWMP) report received March, 26 2014. During the spring monitoring event, four IWMP wells were sampled (3 could not be sampled due to frozen groundwater), and 7 IWMP wells were sampled in the fall. No COCs exceeded ROD FRGs. DRO (1 well fall (was not sampled in spring)) and Arsenic (7 wells in fall, 4 in spring (3 other wells could not be sampled) exceeded COPC standards. DRO levels have exceeded standards in this well since 2012, and were detected prior to 2012; however, changed analytical procedures preclude a direct comparison of these concentrations to current standards for GRO and DRO, as well as to GRO and DRO concentrations. Arsenic levels are believed to be naturally occurring, so a background metals study is being completed to determine naturally-occurring metal concentration in groundwater. Following completion of this study, the significance of the metals concentrations detected will be evaluated. Future sampling results will be used to confirm absence of ROD COCs exceeding FRGs in groundwater. |
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 |
| 9/22/2015 |
CERCLA RI Plan Approved |
Joint approval issued by EPA and DEC for the final "Remedial Investigation / Feasibility Study Management Plan For Operable Units 3, 4, and 5 Source Areas, Eielson Performance-Based Remediation, Eielson Air Force Base, Alaska" dated September 2015 (OU 3, 4 & 5 RI/FS MP). The OU 3, 4 & 5 RI/FS MP describes planned remedial investigations at 23 contaminated sites at Eielson Air Force Base, including LF04. |
Melinda Brunner |
| 10/9/2015 |
CERCLA RI Plan Approved |
DEC and EPA jointly approved the "2015 Annual Field Sampling Plan, Eielson Performance-Based Remediation, Eielson Air Force Base, Alaska" dated September 2015 (FSP). The FSP describes remedial investigations planned for 2015 at 21 contaminated sites at Eielson Air Force Base, including LF04. The FSP is meant to be used in conjunction with the appropriate remedial investigation/feasibility study (RI/FS) management plan(i.e. OU 3,4,& 5) and the Programmatic Quality Assurance Project Plan. |
Melinda Brunner |
| 12/21/2015 |
Update or Other Action |
DEC and EPA issued a letter jointly approving the "Operations and Maintenance (O&M) and Implementation Plan for Landfills LF001 Through LF007, Eielson Air Force Base, Alaska" dated November 2015 (the Landfill OMIP). The Landfill OMIP describes the inspection, maintenance, and repair activities to be performed at Landfills LF001 through LF007 at Eielson Air Force Base. |
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 |
| 8/5/2016 |
Document, Report, or Work plan Review - other |
DEC Reviewed the OU 3,4,5 RI/RA report. This report summarizes the characterization efforts for multiple sites. |
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 |
| 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 |
| 8/6/2018 |
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 |
| 8/10/2018 |
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 issued a secondary round of comments on the, "Draft Final Supplemental Remedial Investigation/Risk Assessment Report for OU3,4,5 Source Areas, Eielson Performance-Based Remediation, Eielson Air Force Base, Alaska," dated October 2018. |
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 |
| 10/17/2019 |
Document, Report, or Work plan Review - other |
DEC provided a response to the air force responses to DEC comments for the Supplemental Remedial Investigation/Risk Assessment Report for OU3,4,5 Source Areas, Eielson Performance-Based Remediation, Eielson Air Force Base, Alaska. A comment resolution meeting was recommended. |
Dennis Shepard |
| 8/11/2020 |
Document, Report, or Work plan Review - other |
DEC received a response to comments and a Final Revision 1 Supplemental Remedial Investigation/Risk Assessment Report for OU- 3,4,5 Source Areas, Eielson Performance Based Remediation, Eielson Air Force Base, Alaska, dated August 2020. This report summarizes remedial investigation (RI)/risk assessment (RA) activities conducted from 2015 through 2018 at Source Areas LF001, LF002, LF003/FT009, LF004, LF006, WP032, WP033, SS036, SS037, DP044, WP045/SS057, DP055, ST056, SS061, and SS064 on Eielson Air Force Base. |
Dennis Shepard |
| 2/26/2021 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 71359 Former landfill. |
Cascade Galasso-Irish |
| 6/2/2021 |
CERCLA RI Report Approved |
The U.S. Environmental Protection Agency (EPA) and Alaska Department of Environmental Conservation (DEC) provided joint approval of the Final Supplemental Remedial Investigation/Risk Assessment Report for OU3,4,5 Source Areas, Eielson Air Force Base (May 2021). The report summarizes remedial investigation (RI)/risk assessment (RA) activities conducted from 2015 through 2018 at Source Areas LF001, LF002, LF003/FT009, LF004, LF006, WP032, WP033, SS036, SS037, DP044, WP045/SS057, DP055, ST056, SS061, and SS064 on Eielson Air Force Base. |
Dennis Shepard |
| 8/29/2022 |
Document, Report, or Work plan Review - other |
DEC provided backcheck review comments for the Final Supplemental Remedial Investigation Work Plan, Eielson Air Force Base, Alaska (August 2022). The Supplemental Remedial Investigation (RI) Work Plan describes the 2022 RI activities to be conducted at Eielson Air Force Base, Alaska. The scope of the Supplemental RI is to address current data gaps at the CERCLA source areas on Eielson AFB for all operating units. |
Dennis Shepard |
| 9/19/2022 |
CERCLA RI Plan Approved |
EPA and DEC provided a joint approval for the Final Supplemental Remedial Investigation Work Plan Eielson Air Force Base, Alaska (September 2022). The scope of this Supplemental RI is to address current data gaps at the CERCLA source areas on Eielson AFB. The data gaps are generally related to the incomplete characterization of site contaminants under the 2015-2021 Performance Based Remediation (PBR) and emerging contaminants identified since the 2015-2021 PBR. |
Axl LeVan |
