| 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 |
| 7/23/1992 |
Update or Other Action |
(Old R:Base Action Code = DD - Decision Document (CERCLIS)). Draft remedial investigation and baseline risk assessment received. |
Former Staff |
| 7/29/1992 |
Update or Other Action |
Potential source is abandoned UST near Building 3224 or leaching of contaminants from soils where direct releases have occurred in past. Site water supply wells A and B are located approximately 400 and 600 feet to NE and E, respectively. |
Former Staff |
| 8/20/1992 |
Update or Other Action |
(Old R:Base Action Code = CORR - Correspondence (General)). 20 day extension requested. |
Former Staff |
| 9/16/1992 |
Meeting or Teleconference Held |
Conference call regarding Draft RI between Project Manager. |
Former Staff |
| 9/30/1992 |
Update or Other Action |
(Old R:Base Action Code = DD - Decision Document (CERCLIS)). Response sent regarding remedial investigation and baseline risk assessment. |
Former Staff |
| 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. |
Former Staff |
| 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. |
Former Staff |
| 10/19/1993 |
Site Ranked Using the AHRM |
Initial ranking. |
Former Staff |
| 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 |
| 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, 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. |
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 10/18/95. |
S&W |
| 12/19/2001 |
Long Term Monitoring Established |
Site is in Long-term Monitoring mode. The remedy selected in the ROD was to monitor for 5 years (1995 to 2000) and then evaluate for closure. The closure evaluation will occur in this coming year (2003). |
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 |
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 |
| 6/30/2005 |
Update or Other Action |
This site was closed under CERCLA during the 2003 ROD Review. Apparently DEC did not close the site due to possible remaining DRO and GRO contamination in the ground water and/or soil. Confirmation sampling for DRO/GRO should occur before site can be closed under 18 AAC 75. |
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 |
| 4/25/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
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 |
| 7/27/2012 |
Site Visit |
During a site visit EPA and Eielson contractors discovered a buried UST near the former bakery. EAFB staff reported that this tank was used in response to a sheen that developed on Garrison Slough. It is unclear in what manner the tank and piping were utilized, but there appears to be a mixture of oily water in the tank. During the site visit, new monitoring wells were being installed as part of the 2012 Installation Wide Monitoring work plan. The driller reported that the well cores were contaminated and that the contamination smelled like PCE. |
Kim DeRuyter |
| 12/12/2013 |
Document, Report, or Work plan Review - other |
Passive Soil Gas/Ground Penetrating Radar/Landfill Survey Tech Memo Received 12-4-2013. The source of contamination at Source Area ST11 is suspected to be diesel fuel leaks from buried piping associated with former Building 3224. The PSG survey at this location was designed to provide additional data to focus future investigation efforts. Sampling showed similar trends for both chlorinated (TCC) and volatile organic compounds (VOC), with detection mainly on the western side of the site. TCC appear to dissipate at a faster rate as they move eastward. A single petroleum detection was found in the southeast section of the site, were both TCC and VOC had been detected.
Geophysical surveys were conducted to identify subsurface anomalies, was conducted in the vicinity of former Building 3224 to locate buried debris and drums.
|
Kim DeRuyter |
| 2/11/2014 |
Document, Report, or Work plan Review - other |
2012-Final installation-wide monitoring program (IWMP) report received June, 24 2013. During the 2012 season four monitoring wells were installed. Two of these wells replaced historic wells that had been decommissioned and two were installed in new locations. Only one COCs (Contaminant of concern) Benzene (1 well) exceeded the final remediation goal. DRO (1 well) was the only COPC (Contaminant of potential concern) that detected in levels that exceeded current MCL (Maximum contaminant level) or ADEC groundwater levels. Pesticides, SCOVs, and metals detected historically in groundwater at concentrations exceeding standards, including arsenic, beryllium, and manganese have the potential to impact groundwater at this source area, but were not included in the 2012 monitoring event. Based on 2012 and historical results it appears residual petroleum impacts may remain in soil within the zone of groundwater fluctuation resulting in occasional detections of benzene at concentrations slightly exceeding the FRG. |
Anna Iverson |
| 5/1/2014 |
Document, Report, or Work plan Review - other |
2013-Draft installation-wide monitoring program (IWMP) report received March, 26 2014. 4 monitoring wells located in the source are where sampled in both spring and fall of 2013 for VOCs (including EDB), PAHs, GRO, DRO, and RRO. Benzene in 1 well (Spring & Fall) was the only COC and DRO 2 wells (spring) was the only COPC that exceeded MCL (Maximum contaminant level) or ADEC groundwater levels. Benzene concentrations are relatively consistent in this well over 2012 and 2013 sampling, so no trend can be identified. Analytical procedures changes between 2012 and 2013 for total petroleum hydrocarbons, make it so a direct comparison between current GRO and DRO levels and past levels to determine a trend difficult. |
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 four monitoring wells at ST011 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 |
| 3/23/2016 |
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. ST011 is included in the RI/FS MP. |
Melinda Brunner |
| 7/22/2016 |
Document, Report, or Work plan Review - other |
DEC and EPA issued joint review comments on the "Draft Work Plan for Treatment System Decommissioning at Source Area ST011, Eielson Air Force Base, Alaska" dated July 2016 (ST011 WP). The ST011 WP describes the: 1) sampling of surface water and soil, as applicable, in the culverts; 2) excavation and removal of three culverts; and 3) sampling of the excavation bases once the culverts are removed. The field work is scheduled for 2016. |
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 |
| 11/30/2016 |
Document, Report, or Work plan Review - other |
DEC and EPA approved the Work Plan for Treatment System Decommissioning at Source Area ST011 |
Monte Garroutte |
| 12/22/2016 |
Update or Other Action |
DEC approved the Remedial Investigation / Feasibility Study Management Plan for Operable Unit 2 Source Areas, Eielson Air Force Base, Alaska (November, 2016). This applies to 7 source areas inside OU2 and 21 source areas outside of OU2. |
John O'Brien |
| 12/23/2016 |
Document, Report, or Work plan 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 |
| 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 |
| 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 |
| 8/6/2018 |
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 |
| 8/21/2019 |
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 draft Decision Document (1 Part B) was submitted for Eielson Source Areas: MY512, MY518, SO504, SS078, and ST011. All of the sites have underlying PFAS contamination and are within the PFOS/PFOA groundwater plume. PFOS/PFOA contamination associated with groundwater in these areas will be addressed under the CERCLA regulatory program in accordance with the Eielson federal facilities agreement. |
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 |
