| 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. Contaminants of concern include benzene, DCE, TCE, barium and vinyl chloride in groundwater. Contaminants of concern in soil include TPH, chromium and PAHs. |
Rielle Markey |
| 8/12/1993 |
Meeting or Teleconference Held |
Meeting in Seattle with EAFB and EPA. This site will be addressed with a feasibility study. |
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, S57, 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 |
(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 |
| 1/21/1998 |
Update or Other Action |
Remedial design completed and implemented by ADEC 1997. Issues resolved at weekly teleconference with Base/EPA. |
Ronan Short |
| 12/19/2001 |
Long Term Monitoring Established |
Landfarm is closed, site is in long-term monitoring. Staff received draft 2001 Monitoring Report. 5 wells sampled for VOCs, GRO, DRO, SVOCs, and metals. 1 well sampled for just PCBs. Benzene (15ppb), PCE (13 ppb), TCE (22 ppb), and vinyl chloride (2.37 ppb) found above MCLs each in just one well, but all different wells. |
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 |
| 1/14/2002 |
Site Number Identifier Changed |
Changed Workplan from X1 to X9 to reflect presence of a hazardous substance. |
Ann Farris |
| 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 |
| 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 |
| 4/21/2004 |
Meeting or Teleconference Held |
Staff met with personnel from Eielson Air Force Base regarding some dewatering activities planned for this summer. One project was determined to not be near any contaminated sites so is being dealt with under the normal wastewater discharge permits. The second project actually calls for installing a drinking water well for a dog kennel and the contractor is requesting to discharge the development water directly to the land. Staff is working with the Air Force personnel and the contractor to ensure the well is in a safe location. |
Ann Farris |
| 10/11/2004 |
GIS Position Updated |
Updated site location using handheld GPS measurements made by Emily Youcha during a site visit. |
Torsten Ernst |
| 6/24/2005 |
Update or Other Action |
Staff recieved the workplan for the 2005 sitewide monitoring. Five wells will be sampled for VOCs, SVOCs, and metals. Lower detection limits are needed for VOCs and SVOCs. Sample results from previous sampling events indicate detection limits for vinyl chloride, pentachlorophenol, and bis(2-ethylhexyl)phthalate were above cleanup levels. ADEC recommended the use of EPA Method 8270 SIM to lower detection limits. This years sampling event will focus on monitoring potential contaminant migration toward Garrison Slough. |
Emily Youcha |
| 6/24/2005 |
Update or Other Action |
Staff received the results of the 2004 sampling efforts. Samples were collected from 6 wells for VOC, SVOC, and metals analysis. VOCs remain in the ground water at concentrations above cleanup criteria. Sample results from 03M19 show an increase in benzene concentration since the well was installed in 2003. VOCs exceeded cleanup criteria in the LF03 source area well 03M08 in 2002 and trace amounts of cis-1,2-DCE were detected in six 2004 samples collected between the source areas and Garrison Slough. |
Emily Youcha |
| 11/22/2005 |
Meeting or Teleconference Held |
EPA and ADEC would like Eielson to define the solid waste management units more clearly for LF03/FT09. Eielson indicated that burial areas exist further to the west than the existing boundaries and currently contamination occurs in that western area, approaching Garrison Slough. |
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 |
| 3/6/2006 |
Update or Other Action |
Staff reviewed the 2005 long-term monitoring results. Well 03M08, located within the landfill boundary on the eastern edge, shows decreasing concentrations of benzene and TCE. Well 03M13, located downgradient and outside the boundary of the landfill and the firetraining area, shows an overall decreasing benzene concentration trend since 1989, but stable since 2001. Well 03M019, also located downgraident and outside the boundary of the landfill and the firetraining area and adjacent to Garrison Slough, shows a drop in benzene concentrations from 11 ppb in 2004 to 7.0 ppb in 2005. The area of contaminated ground water to the northwest of LF03 source area (near Garrison Slough) is of some concern to DEC. This area of benzene,TCE, and PCE-contaminated ground water is outside of the defined LF03 source area boundary. Upgradient wells within the LF03 boundary (03M07, 03M06, 03M05, and 03M02) have been shown to be clean during the past 10 years of sampling. This general area is also thought to have additional buried drums and debris outside the boundary of LF03. It is unclear as to whether the contamination migrated out of the LF03 boundary or is from an additional source area; DEC requested additional clarification regarding this issue within the report text. The results of the data show the need for properly defining and characterizing burial areas or solid waste management units, and delineating and tracking contaminant plumes over time. |
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 |
| 5/7/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
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 |
| 6/2/2011 |
Update or Other Action |
Contaminated Sites and Environmental Protection Agency (EPA) staff co-signed a letter to Eielson Air Force Base regarding the base landfill and fire training area (LF03/FT09). The regulatory agencies are concerned that the decision to use a permeable cover rather than an impermeable cover to prevent movement of groundwater through the landfill may not be protective of human health and the environment because this decision was based on a 1994 sampling event that suggested benzene concentrations had dropped below action levels. Benzene has since been detected at concentrations that are well above cleanup levels in monitoring wells downgradient of the landfill. The letter requests that Eielson fully delineate the groundwater contamination and suggests locations for five new monitoring wells and five downgradient surface water samples from Garrison Slough. Proposed 2011 field activities at LF03/FT09 will be submitted as part of the Uniform Federal Policy – Quality Assurance Program Plan that is due on August 05. |
Kim DeRuyter |
| 6/14/2011 |
Site Visit |
Contaminated Sites staff participated in an all-day site visit that included 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 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 |
| 5/7/2013 |
Site Visit |
Site visit conducted in preparation for the FYR, roughly 600 IDW drums were observed in one of the contaminated soil containment cells. All of the old soil stockpiles have been sent to OIT. EAFB was actively recycling and transporting recycled asphalt (RAP) off site. A a large laydown yard has been constructed on the landfill. A thick layer of RAP was placed over the landfill cap in this area which is located over several of the landfill trenches. The area is fenced and bermed to contain runoff in the event of a spill. The RAP was contoured to allow runoff to drain to all of the corners of the lot which had sumps to pump out the run off. Water from melting snow was ponded in the NE and NW corners. The water was free of sheen. |
Kim DeRuyter |
| 9/11/2013 |
Spill Transferred from Prevention Preparedness and Response Program |
Spill transferred by PERP staff Ashley Adamczak. Spill no. 13309922101; spill date = 8/9/13; substance = investigation-derived waste; quantity = 30 cubic yards of soil spread at cell 1 of landfill 03; PERP file no. 107.02.004. |
Mitzi Read |
| 12/5/2013 |
Document, Report, or Work plan Review - other |
Passive Soil Gas/Ground Penetrating Radar/Landfill Survey Tech Memo Received 12-4-2013. The PSG sampling at Source Areas LF03/FT09 was focused in two areas, on the west side of LF03 above an abandoned buried pipeline and to the north of FT09 where a benzene groundwater plume is present. Sampling showed a high concentration of chlorinated compounds in the southeast corner of the LF03, no notable concentration were found in FT09. Slight peak in Petroleum concentration in the Northeast section of FT09, no notable concentrations were seen in remaining of FT09 and LF03.
Geophysical surveys were conducted to identify subsurface anomalies, the objective was to delineate an abandoned fuel pipeline that was believed to run along the northern edge of the landfill.
During landfill inspection, some of this vegetation appeared to be stressed near the polychlorinated biphenyl landfills at the southwest corner of LF03. There does not appear to be settling on the landfill surface; however, during rainfall, some small puddles and ponding were noted. There was minimal debris around the source area that may have been left from construction and/or fire training exercises.
|
Kim DeRuyter |
| 1/30/2014 |
Conceptual Site Model Submitted |
The AF submitted a Conceptual Site Model Update (Draft) for sites LF03/FT09 and SS37 Received 1/30/14. Due to close proximity of sites and possible plume overlap LF03/FT09 and SS37 are all contained in one report. Soil, ground water, and surface water from Garrison Slough between LF03/FT09 and SS37 were sampled and analyzed for GRO, DRO, VOC, PCE, PCB, TEC and PAH. LF03 /FT09 Sampling shows the DRO plume may be expanding, but does not appear to move offsite and the benzene plume is still present, and may be growing slightly, but appears to not be leeching into surface water. Two VOC plumes and a TCE plume are also present on site, with the VOC plume being roughly twice as large as originally expected. The DRO plume at SS37 is now well-delineated, and the benzene plume is fairly well defined. Through sampling it now appears that no plumes overlap between LF03/FT09 and SS37. |
Anna Iverson |
| 2/11/2014 |
Document, Report, or Work plan Review - other |
2012-Final installation-wide monitoring program report received June, 24 2013. During the 2012 season twelve monitoring wells were installed. Six of these wells replaced historic wells that had been decommissioned and six were installed in new locations. 27 wells were purged and sampled (12 new and 15 existing), two COCs (Contaminant of concern) benzene (6 wells), and vinyl chloride (1 well) exceeded the FRG (final remediation goal). 4 COPC (Contaminant of potential concern) Petroleum Hydrocarbons-DRO (1 well), PAHs-Dubenco (a, h) anthracene (1 well), SVOCs – 3&4 methylphenols (1 wells), and Arsenic (17 wells) were detected in levels that exceeded current MCL (Maximum contaminant level) or ADEC groundwater levels. Pesticides and radioactively contaminated photographic chemicals have the potential to impact groundwater at this source area, but were not included in the 2012 monitoring event.
In general, based on the comparison between the historical and 2012 concentrations and plume extents, the groundwater impacts from COCs have decreased, indicating a general decline in plume mass. Moreover, comparison of the historical 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 in wells 03M13, 03M19, and 09M02B, and for PCE in well 03M08. Results of analyses performed in 2012 indicated a slightly more easterly location for the vinyl chloride impacted groundwater (based on one well with a concentration exceeding the FRG); results of further monitoring will be used to confirm this.
|
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 and fall 2013 monitoring events, all 27 IWMP wells were sampled. 4 COCs benzene (4 wells spring & fall; 1 well fall only), PCE (1 well spring & fall), TCE (1 well spring only), and vinyl chloride (1 well spring and 1 well fall) exceeded the FRG (final remediation goal). All COCs exhibit a decreasing trend, except Vinyl Chloride which concentrations have varied over the years and therefore trends are inconclusive. 3 COPCs, Petroleum Hydrocarbons-DRO (1 well spring and fall), SVOCs – 3&4 methylphenols (1 well spring only), and Arsenic (20 monitoring wells total in 2013, including 15 monitoring wells in the spring and 19 monitoring wells in fall) were detected in levels that exceeded current MCL (Maximum contaminant level) or ADEC groundwater levels. Arsenic levels are believed to be naturally occurring, so a background metals study is being completed to determine naturally-occurring metal concentration in groundwater. COPC trends could not be determined since exceedances occurred in a single well. |
Anna Iverson |
| 8/19/2015 |
Site Visit |
Brunner and Breitenberger visited LF03 to inspect the investigation-derived waste (IDW) being staged on-site, pending analysis and final disposition (as appropriate). |
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 LF03. |
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 LF03. 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 |
| 6/22/2016 |
Site Visit |
Brunner and Breitenberger visited LF003 to inspection Holding Cell #1 where drummed investigation-derived waste is be temporarily stored pending analytical results and disposal. Observed drums were appropriately labeled and secured. |
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 |
| 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 |
| 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 |
| 12/30/2022 |
Document, Report, or Work plan Review - other |
DEC provided review comments for the Draft Uniform Federal Policy-Quality Assurance Project Plan, Environmental Construction and Services, Remedial Action – Construction LF003 Holding Cell Repair, United Air Force Civil Engineer Center dated December 2022. During site activities, the field team will manage and treat any standing surface water, excavate and dispose of up to approximately 10,000 cy of soil from the holding cells, collect confirmation characterization soil samples of underlying soils after excavation and liner removal, install a new 10-mil thick geo-textile liner in each holding cell, replace approximately 10,000 cy of soil to rebuild the holding cells, install gravity flow concrete sumps in each holding cell, grade the backfilled soil, contour and revegetate the soil berms around each holding cell. |
Dennis Shepard |
