| Action Date |
Action |
Description |
DEC Staff |
| 3/8/2011 |
CERCLA PA |
Submit comments on the Pacific Air Forces Comprehensive Site Evaluation (CSE) Phase I/II Work Plan - Military Munitions Response Program (MMRP) for 11 Alaska Air Force Facilities, including Indian Mountain. The work plan identifies PA/SI level investigation activities that will be conducted to determine if any MMRP eligible sites are present at the installations. |
Tamar Stephens |
| 8/18/2011 |
CERCLA PA |
Submit approval letter for MMRP CSE Phase I/II work plan for 11 Air Force installations in AK. Indian Mountain is included in the plan. |
Tamar Stephens |
| 10/17/2012 |
CERCLA PA |
Submit comments on the Draft Final CSE Phase I/II MMRP report for Indian Mountain MMRP. Report documents the results of archival research, interviews with personnel familiar with the facility, and site investigation activities. Based on the information presented in the report ADEC concurs that there are two sites at the Indian Mountain LRRS that are eligible for inclusion into the MMRP program. The sites include a small arms range and an area used for disposal of small arms ammunition by burning. |
Tamar Stephens |
| 7/31/2013 |
CERCLA SI |
Submit approval letter for Final CSE Phase I/II MMRP Report for Indian Mountian LRRS. Two source areas were entered into the database to account for the two Munition Response Sites identified for further investigation in the report. |
Guy Warren |
| 8/2/2013 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 8/5/2013 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 79491 name: AB938 |
Mitzi Read |
| 8/5/2013 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 79490 name: SR937A |
Mitzi Read |
| 4/29/2015 |
Document, Report, or Work plan Review - other |
Submit comments to the US Air Force on the MMRP Feasibility Study for sites AB938 and SR937. The report evaluates alternatives for addressing lead impacted soil at the small arms range (SR937) and the open burn area (AB938). Alternatives include LUCs, capping, debris removal, and off-site disposal. |
Guy Warren |
| 9/7/2016 |
Document, Report, or Work plan Review - other |
ADEC reviewed the draft version of the Indian Mountain LRSS MMRP Sites AB938 & SR937 ROD and all comments have been addressed. DEC has requested a final version for approval. The proposed remedy includes soil excavation and removal and LTM. |
Holly Weiss-Racine |
| 4/28/2017 |
CERCLA ROD Approved |
The Final Record of Decision (ROD )for Indian Mountain LRSS MMRP Open Burn/Open Detonation AB938 & Small Arms Range SR937 was signed on this date. The ROD explains that during previous investigations, neither munitions and explosive of concern (MEC) nor munitions debris (MD) were found at these sites and lead was the only contaminant of concern identified above ADEC (2016)cleanup levels. Lead also exceeded USEPA soil screening levels for ecological receptors. The selected remedy is debris and soil removal and treatment (stabilization with Eco-Bond) followed by onsite disposal in the Indian Mountain Landfill. |
Kim DeRuyter |
| 3/6/2018 |
Meeting or Teleconference Held |
DEC met with US Air Force (USAF) staff to review and discuss cleanup progress at all the Indian Mountain sites. The only ongoing work is the long-term monitoring (LTM) work at eight sites (SD001, LF004, LF005, LF006, SS011, SS002, SS009, SS010). Tentatively, there is additional work at OT008, Upper Camp PCB Spill and MMRP sites planned for 2019, pending funding from the USAF. The other sites; LUST, 2004 Spill Arctec, Fuel Offload Area (PL510) and the Incinerator Fuel Line were reviewed and discussed for a cleanup path forward. |
Erica Blake |
| 8/31/2018 |
Site Visit |
DEC conducted a brief 4-hour site visit at the Indian Mountain Long Range Radar Station sites. DEC observed sites at both the Upper and Lower Camp areas. A lot of the Lower Camp sites extend into thick brush and wooded areas, and because time on the ground was limited, not all of those areas were inspected closely. At the Upper Camp, some of the sites are on the sides of very steep slopes, and were not visited. Warning signs were recently installed, and were visible at all the areas of concern. |
Erica Blake |
| 6/25/2019 |
Site Visit |
DEC conducted a brief site visit at the Indian Mountain Long Range Radar Station sites as part of scoping for contractor bids. DEC observed sites at both the Upper and Lower Camp areas. The MMRP shooting range site was visited. The OB/OD site was not reliably located during the visit. |
Kevin Fraley |
| 10/30/2019 |
Meeting or Teleconference Held |
A scoping teleconference was held with USAF and contractors to discuss plans for lead soil removal or remediation at Indian Mountain MMRP sites in 2020. This meeting was to work through issues in advance of preparing a work plan for the activities. |
Kevin Fraley |
| 11/26/2019 |
Meeting or Teleconference Held |
A teleconference was held with the Air Force and contractors to further discuss cleanup of lead-contaminated MMRP sites at Indian Mountain. The Air Force indicated they would like to excavate, immobilize, and cap the lead contaminated soil in place under CS authority. This may require an ESD as the ROD remedy was to place the soil in an on-site landfill, but CS Solid Waste Division has indicated they are not willing to accept this option. A work plan for the MMRP sites is expected winter 2019-2020 |
Kevin Fraley |
| 3/18/2021 |
Document, Report, or Work plan Review - other |
DEC Approved the 2020 UFP-QAPP for Remedial Action - Construction at OT008, SS011, AB938 and SR937. The work plan was originally sent in April 2020, and an approval letter was planned to be sent. However, upon subsequent review of the files, the letter was not drafted before work was conducted at the site. |
Tim Sharp |
| 2/18/2022 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 79490 SR937A. |
Tim Sharp |
| 2/18/2022 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 79491 AB938. |
Tim Sharp |
| 3/9/2022 |
Document, Report, or Work plan Review - other |
DEC sent comments for the Indian Mountain LRRS Draft Remedial Action - Construction (RA-C) Report.
At OT008, three areas of polychlorinated biphenyls (PCB) contaminated soil were delineated, excavated, and capped based on the levels of contamination. Soil with PCB contamination between 1 mg/kg and 10 mg/kg was capped between two feet of gravel and a liner at the former White Alice Communication System (WACS) Station area. Soil above 10 mg/kg was excavated and removed for disposal offsite as non-Toxic Substances Control Act (TSCA) hazardous waste, and soil greater than 50 mg/kg was disposed of as TSCA regulated waste.
At SS011, samples were taken to characterize the remaining petroleum contamination in the soil in advance of implementing the record of decision (ROD) remedy of in-situ land farming. An area to the south of the release could not be fully delineated due to the active runway present.
At the two Military Munitions Response Program (MMRP) sites AB938 and SR937, lead-contaminated soil was treated with FreeFlow Technologies and sampled. All samples fell below applicable cleanup levels.
Comments for the document included concerns of waste transport and disposal approval, lack of confirmation samples collected, and concrete/transformer removal without sampling/discussion with the Solid Waste Program.
|
Tim Sharp |
