| Action Date |
Action |
Description |
DEC Staff |
| 1/17/1992 |
Site Added to Database |
This site is included in the state EPA Eielson FFA 100.38.011. |
Former Staff |
| 5/17/1992 |
Update or Other Action |
Move fire station parking lot to Operable Unit 3. |
Former Staff |
| 9/8/1992 |
Site Ranked Using the AHRM |
Initial ranking. |
Former Staff |
| 9/24/1992 |
Update or Other Action |
Verified that this source is in OU3. Summer field activities identified in Addendum III of OU -3, 4 and 5 Management Plan. |
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 |
| 3/23/1993 |
Site Characterization Workplan Approved |
(Old R:Base Action Code = MP - Management Plan (CERCLIS)). Received workplan for natural attenuation of organic contaminants, Sources 45 and 57. |
Rielle Markey |
| 4/21/1993 |
Update or Other Action |
(Old R:Base Action Code = CORR - Correspondence (General)). Sent correspondence regarding review of workplan for natural attenuation study for site. |
Rielle Markey |
| 8/12/1993 |
Update or Other Action |
(Old R:Base Action Code = DD - Decision Document (CERCLIS)). This source will proceed to a Feasibility study. |
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, SS61, DP25, ST27, WP33, SS35, SS36, SS37, SS39, SS63, ST58, SS64, LF02, LF03, FT09, LF04, and LF06. |
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 |
Intrinsic REE/CA for site 45/57 (Septemeber 1995), EAFB. |
Rielle Markey |
| 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 |
| 9/24/1996 |
Record of Decision |
Final Site-Wide Record of Decision, September 1, 1996; two documents received (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 10/23/95. |
S&W |
| 12/26/2001 |
GIS Position Updated |
Worked with Heather Goldman obtaining GIS latitude and longitude from 1:63,300 topographic map. |
Heather Goldman |
| 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: 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 |
| 10/6/2002 |
Update or Other Action |
ADEC was notified that the Air Force had been using Well C, which is located within the TCE plume associated with WP45/SS57. A meeting between the Air Force and ADEC on 10/5/02 resulted in an agreement to decommission Well C (as was supposed to be done previously). The Air Force is going to look into using another backup well at Building 1301. The Air Force indicated Well C would be taken offline immediately and money would be programmed to properly decommission. |
Ann Farris |
| 1/21/2003 |
Update or Other Action |
The Air Force's Remedial Process optimization team plans to do further groundwater sampling in this area to better delineate the TCE plume. |
Ann Farris |
| 1/21/2003 |
Long Term Monitoring Established |
This site is included in the Sitewide Monitoring Program. This site is monitored with site WP45. Monitoring will occur in 2004 and re-evaluated in 2008 during ROD Review. |
Emily Youcha |
| 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 |
| 8/9/2005 |
Update or Other Action |
Staff requested Eielson sample the nearby building for vapour intrusion. Staff received results from Bioenvironmental group. They used a PID to detect VOCs within the building and no VOCs were detected (0.0 ppm). Staff concurred with the results and method because they would use industrial air quality standards (OSHA) which are in the ppm range. Staff recommended for future sampling, charcoal tubes or passive diffuser sampling techniques should be used. |
Emily Youcha |
| 8/9/2005 |
Meeting or Teleconference Held |
Staff requested Eielson evaluate the feasiblity of enhanced biodegredation at this site. TCE exists in the ground water up to 61 mg/L. Staff would like to see the ground remediated and does not concur with Eielson that reductive dechlorination is occuring at the site because biodegradation products are not found and geochemistry is no longer conducive to anaerobic degredation. Staff participated in a meeting with Eielson, and they stated they would start a programming document for enhancing bioremediation at the site, even though funds would probably not be available to conduct the project for several years. |
Emily Youcha |
| 8/9/2005 |
Update or Other Action |
Staff received the results from the 2004 Sitewide Monitoring Report. TCE concentrations in well 45MW08 continue to remain elevated and variable. Recent measurment was 4.1 mg/L TCE. In 2001, TCE was found up to 61 mg/L nearby well 45MW08. The dissolved phase TCE plume for WP45/SS57 is probably about 5 acres. |
Emily Youcha |
| 11/22/2005 |
Meeting or Teleconference Held |
Staff participated in a meeting with the EPA and Eielson AFB regarding this site. The Air Force is in the process of nominating the site for a SERDP sponsored research project for carbon source injection at the site. If the project is not accepted for the research initiative, Eielson AFB will request FY07 HQ/PACAF validation for a project to add a carbon donor at the source area. The purpose of the carbon donor project will be to enhance the natural degradation of the TCE and breakdown components. Proposed sampling frequencies to evaluate the carbon donor project will be discussed under the proposed Work Plan phase of the annual Sitewide Monitoring Program. |
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 |
| 5/25/2006 |
Update or Other Action |
Contaminated Sites staff reviewed a dewatering permit with DEC Division of Water staff for Eielson Air Force Base. Dewatering will occur 1500 feet upgradient from this contaminated site. Staff requested the contractor to estimate the radius of influence for each dewatering project under the worst-case pumping scenario. It was determined that the contaminated site would likely not be impacted by dewatering. |
Emily Youcha |
| 6/15/2006 |
Meeting or Teleconference Held |
Staff participated in a meeting to discuss site WP45/SS57 enhanced bioremediation project. The Air Force is going to evaluate whether to use a carbon donor to get the chlorinated solvents to degrade via reductive dechlorination. This summer's effort will be plume delineation and collection of geochemical indicators as part of the remedial action operations (RAO) process. Water levels, VOCs, and geochemistry data will be collected. Staff expects a workplan within the next few weeks. |
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 |
| 8/16/2006 |
Update or Other Action |
Contaminated Sites staff received a request to treat investigative derived waste from two sites at Eielson Air Force Base consisting of trichloroethylene and petroleum with lead contaminated ground water at Organic Incineration Technologies (OIT). Staff consulted with Doug Bauer who indicated that it may be possible to treat low concentrations of chlorinated solvents, but the water is sprayed on soil from other facilities and Eielson could be held partly responsible for all the contamination if the soil treatment fails and/or OIT goes out of business. Staff recommended taking water with hazardous substances to Eielson's hazardous waste accumulation point for offsite disposal or to an approved facility. |
Emily Youcha |
| 9/11/2006 |
Site Characterization Workplan Approved |
Staff approved the Aug 2006 remedial action objectives workplan for site characterization of the TCE contaminated soil and ground water at SS57 site. Approximately 20 or more wells will be installed and soil samples will be collected. Wells will be surveyed to deterimine the ground-water flow direction. This characterization is to plan for the remedial design of enhanced bioremediation project. |
Emily Youcha |
| 2/1/2007 |
Update or Other Action |
The Draft Remedial Action Operation Report for Operable Unit 3 was received. Four monitoring wells were installed, and 23 soil boring/groundwater sampling points were advanced in an area that overlaps portions of the WP45 and SS57 source areas. Soil samples were collected at 3 and 8 feet below ground surface. Nearly all of the samples detected TCE above the soil cleanup level of 20 ug/kg with concentrations up to 110,000 ug/kg. Groundwater samples were collected at 12 feet below ground surface. Most of the sample results exceeded the groundwater cleanup level of 5 ug/L with concentrations up to 89,000 ug/L. The extent of the plume was not delineated vertically or laterally. |
Kim DeRuyter |
| 9/25/2007 |
Leaking Underground Storage Tank Corrective Action Underway |
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 |
| 1/30/2008 |
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 |
| 9/27/2010 |
Update or Other Action |
Due to comingled groundwater plumes, this site is managed with Eielson AFB Photo Lab (OU3) WP45; Hazard ID #383. Please see the WP45 site for current site updates. |
Kim DeRuyter |
| 6/14/2011 |
Site Visit |
Contaminated Sites staff participated in an all-day site visit that included WP45/SS57, SS67, LF03/FT09, ST10/SS14, DP25, ST27, SS35, SS37 and the stockpile containment area. Drums were seen in and adjacent to the pond at SS35 and both petroleum and biogenic sheens were observed on the surface of the pond. All stockpiles in the containment area were covered but two stockpiles were not labeled and from unknown locations. |
Kathleen Beutel |
| 6/14/2011 |
Site Visit |
Contaminated Sites staff participated in an all-day site visit that included WP45/SS57, SS67, LF03/FT09, ST10/SS14, DP25, ST27, SS35, SS37 and the stockpile containment area. Drums were seen in and adjacent to the pond at SS35 and both petroleum and biogenic sheens were observed on the surface of the pond. All stockpiles in the containment area were covered but two stockpiles were not labeled and from unknown locations. |
Kim DeRuyter |
| 6/23/2011 |
Site Characterization Workplan Approved |
Contaminated Sites staff and the Environmental Protection Agency provided comment on a brief letter workplan submitted by EA Engineering on behalf Eielson Air Force Base. EA plans to survey monitoring wells and conduct a soil gas survey at WP45/SS57 to further delineate trichloroethylene and other volatile organic compounds in soil and groundwater. Groundwater monitoring at WP45/SS57 will be described in the Quality Assurance Project Plan which is due this week. |
Kim DeRuyter |
| 7/12/2011 |
Document, Report, or Work plan Review - other |
Contaminated Sites and EPA staff provided joint comments on the draft Quality Assurance Program Plan, received on June 24, for a supplemental remedial investigation (SRI) at WP45/SS57. The objectives of the SRI are to delineate the soil and dissolved-phase contamination, evaluate the risk of vapor intrusion and obtain basic hydrogeologic information. Comments noted that the vapor intrusion investigation should follow a phased approach, requested specific information about how the Triad process will be implemented and asked for inclusion of all source areas (two dry wells, one maintenance shed, one fire training area) on figures. |
Kathleen Beutel |
| 7/12/2011 |
Document, Report, or Work plan Review - other |
Contaminated Sites and EPA staff provided joint comments on the draft Quality Assurance Program Plan, received on June 24, for a supplemental remedial investigation (SRI) at WP45/SS57. The objectives of the SRI are to delineate the soil and dissolved-phase contamination, evaluate the risk of vapor intrusion and obtain basic hydrogeologic information. Comments noted that the vapor intrusion investigation should follow a phased approach, requested specific information about how the Triad process will be implemented and asked for inclusion of all source areas (two dry wells, one maintenance shed, one fire training area) on figures. |
Kim DeRuyter |
| 8/16/2011 |
Update or Other Action |
Sites WP45 and SS57 are managed together. Please see DEC file 107.38.022/Hazard ID 383 for updates. |
Kathleen Beutel |
| 12/7/2011 |
Meeting or Teleconference Held |
Contaminated Sites staff participated in the final weekly triad meeting for the Eielson Air Force Base WP45/SS57 site. Eielson has completed horizontal delineation of the comingled TCE and benzene plumes that originate from a former fuel hydrant line, fire training pits and two dry wells. A treatability study conducted from 2008 – 2010 appears to have degraded TCE to DCE and vinyl chloride in the heart of one of the TCE source areas, but large portions of the TCE source areas were not treated because the extent of the source areas was previously unknown. A tech memo summarizing 2011 field work will be submitted this winter. Field work next summer will include vertical plume delineation and placement of permanent monitoring wells. |
Kathleen Beutel |
| 12/7/2011 |
Meeting or Teleconference Held |
Contaminated Sites staff participated in the final weekly triad meeting for the Eielson Air Force Base WP45/SS57 site. Eielson has completed horizontal delineation of the comingled TCE and benzene plumes that originate from a former fuel hydrant line, fire training pits and two dry wells. A treatability study conducted from 2008 – 2010 appears to have degraded TCE to DCE and vinyl chloride in the heart of one of the TCE source areas, but large portions of the TCE source areas were not treated because the extent of the source areas was previously unknown. A tech memo summarizing 2011 field work will be submitted this winter. Field work next summer will include vertical plume delineation and placement of permanent monitoring wells. |
Kim DeRuyter |
| 3/17/2014 |
Document, Report, or Work plan Review - other |
The AF submitted Draft QAPP Addendum No.2 for Vapor Intrusion Study WP45/SS57. Received 2/24/14. This VI study will help to delineate the horizontal and vertical extent of the groundwater plume as well as the plume stability. Additionally, TCE concentrations in soil and further information into the vapor intrusion pathway for indoor air is to be investigated. The study plans to collect vapor intrusions samples (sub-slab, indoor and outdoor air) at 5 building throughout the plumes (1206, 1190, 1183, 1168, and 3180). |
Anna Iverson |
| 6/26/2014 |
Site Visit |
CS staff participated in an all-day site visit with EPA and USAF personnel. Sites visit included WP45/SS57, ST58, SS67, SS62, DP44, LF02, LF06 and LF07. Construction was on going at WP45/SS57, during construction no high level reading of TCE has been found. ICs remain in place at site, with some monitoring wells experiencing frost heave. |
Anna Iverson |
| 11/10/2014 |
Document, Report, or Work plan Review - other |
The AF submitted 2013 Final Supplemental Remedial Investigation for WP45/SS57. Received November 2014. This RI hopes to better delineate contaminants currently found on site, through analysis of including TCE (Trichlorothene), DRO, cis-DCE (cis-1, 2-dichloroethene), VC (vinyl chloride), and benzene in both soil and groundwater. Soil analysis shows DRO and TCE, generally are found together, and in areas where TCE is found alone, much lower TCE concentration were noted. In shallow groundwater TCE, cis-DCE and VS are found in high concentrations, TCE appears to be low in deep aquifers. Vapor intrusions studies were conducted, but due to the incomplete nature of the vapor intrusion assessment additional studies are needed. There was also a lack of sampling for perfluorinated compounds, which are believed to be present at this site. |
Anna Iverson |
| 8/7/2015 |
Document, Report, or Work plan Review - other |
DEC and EPA provided joint comments to the USAF on the "Draft After-Action Report, Vapor Intrusion Investigation for Source Area WP45/SS57, July-August 2014 and February 2015 Sampling Events" dated June 30 2015 (WP45/SS57 VI report). The WP45/SS57 VI report describes portions of a supplemental remedial investigation at Eielson Air Force Base, focused on vapor intrusion risks at buildings in the WP45/SS57 source area. |
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 SS57. |
Melinda Brunner |
| 9/22/2015 |
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 SS57. 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 |
| 12/25/2015 |
Update or Other Action |
DEC & EPA issued a joint letter concurring with the USAF's proposal to defer completion of the remedial investigation (RI) and feasibility study (FS) at WP045 and SS057 to 2018. The proposal was based on the need to do further investigation beyond the already completed supplemental RI and vapor intrusion investigation. |
Melinda Brunner |
| 12/29/2015 |
Site Characterization Report Approved |
DEC and EPA issued a joint approval letter for the "After-Action Report, Vapor Intrusion Investigation for Source Area WP45/SS57, July-August 2014 and February 2015 Sampling Events" dated 4 December 2015. |
Melinda Brunner |
| 5/17/2016 |
Site Visit |
Brunner & Breitenberger conducted a site visit to observe the implementation of a site-specific sampling and analysis plan during the upgrade of the fueling station at Building 1207. |
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 included the characterization of 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 |
| 3/1/2021 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 71339 Fire Station Parking Lot. |
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 |
