| Action Date |
Action |
Description |
DEC Staff |
| 6/20/1994 |
Site Characterization Workplan Approved |
(Old R:Base Action Code = RI - Remedial Investigation). Reviewed Draft RI/FS Work Plan and Sampling Analysis Plan dated June 1994. Final plan will include more specific sampling plans for tank site. ADEC faxed work plan approval 6/21/94. |
Laura Noland |
| 10/1/1995 |
Update or Other Action |
(Old R:Base Action Code = FS - Feasibility Study (General)). Final Indian Mountain LRRS, Alaska, Remedial Investigation/Feasibility Study Report and Appendices, received 7/2/1996. |
Tamar Stephens |
| 1/1/1996 |
Update or Other Action |
(Old R:Base Action Code = RI - Remedial Investigation). Final Indian Mountain LRRS, Alaska, Addendum to Remedial Investigation/Feasibility Study Report (October, 1995), received 7/2/1996. |
Tamar Stephens |
| 9/6/2001 |
Site Characterization Workplan Approved |
Approval of Draft Site Investigation at LF05, LF06, OT08, SS11, and SS02/AOC07 Work Plan at Indian Mountain LRRS. |
Patrice Buck |
| 8/22/2002 |
Meeting or Teleconference Held |
Buck and Pingree met with an AFCEE risk assessor, Jody Wireman who will be reviewing the 1995 RA for Indian Mt. We have agreed to review a work plan that AFCEE will develop based on the previous Indian Mt LRRS risk assessments, an upcoming site visit, and a review of ADEC guidance. The goal is to evaluate whether the previous human health and ecological risk assessments meet the needs of current ADEC and AF guidance and determine whether changes in guidance will result in a need to prepare new risk assessments for some Indian Mt LRRS sites. ADEC will wait for the work plan and completion of this review prior to evaluating the current RA. |
Patrice Buck |
| 3/7/2003 |
Meeting or Teleconference Held |
Buck and DEC contractor, and the AF met to discuss DEC's comments (sent 2/28/03) on AFIERA's Risk Assessment Work Plan. |
Patrice Buck |
| 3/7/2003 |
Meeting or Teleconference Held |
Staff, Air Force, and DEC consultants held a teleconference to discuss the draft risk assessment work plan for Indian Mountain Long Range Radar Station. The Air Force explained that they plan to retain the site for industrial commercial use in the foreseeable future. Therefore, there is no need to consider a residential use scenario at this time. However, the AF agreed to evaluate the site in terms of residential use for future land use planning. The participants agreed to the following items. 1) The Air Force will prepare a conceptual site model (CSM) using a commercial industrial scenario for current land use. 2) A residential scenario will be used to develop an additional CSM for future use of the site. 3) The highest concentrations of contaminants of concern detected at the site will be used to screen against risk-based exposure levels. 4) If use of the highest concentrations results in an unreasonably conservative exposure scenario, a statistical approach for evaluating exposure pathways may be explored. If the risk assessment indicates that contaminant levels are too high for residential use, the Air Force will propose institutional controls to restrict residential land use at the site. |
Patrice Buck |
| 3/27/2003 |
Update or Other Action |
Staff sent a Request For Proposal (RFP) to contract with environmental consulting firm to review the statistical analysis for background concentrations documents at the Indian Mountain Long Range Radar Site (LRRS) There are two documents to review. The first is the Remedial Investigation / Feasibility Study Report (RI/FS) Section 3.1, prepared by a consultant for the Air Force in 1995. The second is the proposed narrative discussion on background in the draft decision documents (in development). |
Patrice Buck |
| 1/16/2004 |
Update or Other Action |
Staff will have a teleconference on January 15 with the Air Force and Montgomery Watson Harza (MWH) to discuss the transfer of the risk assessment project for Indian Mt LRRS from Brooks AFB technical support to MWH. The Brooks' team had developed a work plan that DEC commented on last February; unfortunately no further work has been done. In order to continue with the project the 611th has contracted with MWH to continue developing a revised risk assessment work plan. The teleconference will discuss what work needs to be done. |
Patrice Buck |
| 11/26/2004 |
Update or Other Action |
Staff received another Risk Assessment Work Plan titled Draft Final Human Health and Ecological Risk Assessment at OT08 and SS10 Workplan. The 1995 RI/FS Risk Assessment was not approved by ADEC. The previous 2002 sitewide Risk Assessment Workplan for Indian Mtn was not approved by ADEC. Staff has hired a contractor to review the new work plan. |
Emily Youcha |
| 2/18/2005 |
Site Added to Database |
PCB contamination. |
Deborah Williams |
| 2/18/2005 |
GIS Position Updated |
Reference map used was TopoZone using NAD 83. |
Deborah Williams |
| 2/18/2005 |
Update or Other Action |
Site was added to the database. Other entries for this site may be included in the general Indian Mountain LRRS database entry. Information is provided in the 1995 RI/FS for Indian Mountain. |
Emily Youcha |
| 2/18/2005 |
Update or Other Action |
A risk assessment workplan was reviewed by ADEC and the ADEC term contractor. ADEC requests the workplan also include the following information: 1) Discussion of data gaps, 2) Maps showing the extent of contamination, 3) toxicity tables, and 4) exposure assumptions. Additionally, it was previously agreed that pesticides will be evaluated in an area-wide pesticide investigation and risk assessment, rather than including pesticides in each individual site risk assessment. |
Emily Youcha |
| 4/13/2005 |
Meeting or Teleconference Held |
Staff received updated figures and discussion describing fate and transport at the site. Contamination above Method Two Soil cleanup levels exists in the footprint of OT08 and generally decreases downgradient. Only one sample was collected further downgradient (350 ft) to evaluate transport offsite and PCB contamination was detected, but below cleanup levels, staff responded with minor comments. Staff received the toxicity values and exposure assumptions and responded with minor comments. Staff expects to receive a discussion of data gaps to review before the workplan is finalized. |
Emily Youcha |
| 6/15/2005 |
Update or Other Action |
The spring Restoration Advisory Board (RAB) meeting in Hughes for the Indian Mountain LRRS was cancelled by the 611th Civil Engineer Squadron due to difficulty obtaining permission for travel from the Air Force. A RAB meeting has not been held in Hughes since 2003. Additionally, a field visit that was to be conducted in July by the Air Force and Contaminated Sites staff was cancelled due to similar problems. |
Emily Youcha |
| 7/11/2005 |
Update or Other Action |
Risk Assessment workplan Approved. Because the Air Force expects to retain management of this land, this risk assessment is tailored to the industrial-use scenario. However, if there is ever a change in land use, the Air Force will be required to re-evaluate risk at the site under residential and subsistence land-use scenarios.
ADEC has concerns about the site characterization efforts at OT08 and potential data gaps regarding the downgradient migration of polychlorinated biphenyls (PCBs). A significant amount of PCB-contaminated soil and PCB oil was removed from the site in 1985 and ADEC is concerned the current amount of data collected at OT08 does not provide sufficient evidence that PCBs are not migrating. Moreover, PCB contamination below a human health cleanup level could still cause an ecological risk particularly because PCBs can biomagnify and bioaccumulate. Although ADEC agrees that migration is probably limited to within the upper slopes of Indian Mountain, the delineation of PCB-contaminated soils in the downgradient area of Upper Camp is a data gap that could impact site management decisions in the future. ADEC would like to see a more detailed discussion about this data gap in the risk assessment report and how this data gap impacts the human health and ecological conceptual site model at OT08 and the risk assessment calculations.
Although ADEC has some concerns, the current workplan is a considerable improvement over the previous workplan submittals for Indian Mountain, and is approved. |
Emily Youcha |
| 9/23/2005 |
Update or Other Action |
Staff received the Draft Risk Assessment and forwarded a copy to the ADEC Risk Assessor for review. |
Emily Youcha |
| 9/30/2005 |
Update or Other Action |
Staff visited the Indian Mtn LRRS and visited the IRP and compliance sites with the contractor operating the radar station (Arctec). Weather conditions limited a visit to the top of Upper Camp. |
Emily Youcha |
| 9/30/2005 |
Update or Other Action |
Staff commented on the Indian Mtn Draft Risk Assessment for SS10/OT08. Comments include the following: 1) the likelihood of contaminant spreading during demolition activities and the implications this would have on the risk estimate, 2) subsistence users of the site would be better represented by the ADEC standard default exposure duration for residents of 30 years, 3) If the future land use or ownership changes, the risk estimates presented for OT08 and SS10 will need to be reevaluated 4) ADEC was able to replicate dose calculations for surface soil, but not for subsurface soil, and 5) PCB concentration in excess of 1 mg/kg is an appreciable level from a human health perspective. Since PCBs are bioaccumulative, concentrations below 1 mg/kg may also be considered appreciable from an ecological perspective. |
Emily Youcha |
| 1/26/2006 |
Risk Assessment Report Approved |
The human health risk assessment evaluated potential risks for present and future industrial site use for adult site workers, adult site visitors, and the subsistence fisher/hunter/gatherer. The residential scenario was not evaluated because the current industrial scenario is not anticipated to change. Contract personnel (site workers) operating the minimally attended radar facility at Upper Camp were assumed to be the reasonable maximum exposure scenario for the human health risk assessment. The risk assessment compared its findings with the State of Alaska risk management standards. Based on the information currently available, DEC concurs with the following specific human health risk assessment conclusions in this report.
1. Lifetime cancer risks exceed the risk management standard of 1 in 100,000 (1.0 x 10-5) for the OT08 site worker. Cancer risk results from the exposure to polychlorinated biphenyls (PCBs), specifically Aroclor 1260, and Isophorone through soil ingestion, dermal contact with soil, and dust inhalation. The primary compound contributing to this carcinogenic risk is Aroclor 1260.
2. Non-cancer risks exceed the risk management standard of hazard index of 1.0 for the OT08 site worker. Non-carcinogenic risk results principally from exposure to Aroclor 1260 through soil ingestion, dermal contact with soil, and dust inhalation.
A two-tiered approach was used for the ecological risk assessment. Conservative screening (Tier I) was first conducted to evaluate whether the chemical concentrations exceed protective screening criteria. A more detailed Tier II assessment would be performed if chemical concentrations exceeded protective screening criteria. However, it was found in the Tier II qualitative exposure analysis that the contaminants of potential ecological concern did not pose a significant ecological hazard. Therefore a quantitative Tier II ecological risk assessment was not performed. If the land-use scenario or ownership at this site changes, this risk assessment should be reevaluated. This risk assessment does not propose risk-based cleanup levels. Therefore, DEC approval of cleanup levels is not included in approval of this risk assessment. |
Emily Youcha |
| 2/1/2006 |
Institutional Control Record Established |
The 611th CES Base General Plan indicates land-use controls for this site. LUCs are not final but state that no action or activity should occur at this site. The 611 CES should be contacted if any work is proposed in the vicinity of the site. |
Emily Youcha |
| 5/5/2006 |
Update or Other Action |
Contaminated Sites staff provided comments on the Indian Mountain Long Range Radar Station Focused Feasibility Study for Upper Camp site OT08. A risk-based cleanup level of 77 mg/kg for polychlorinated biphenyls (PCBs) was calculated based on the results of the risk assessment. The site is located on a mountain top with limited access and site workers access the site less than 24 days per year. The Air Force estimated approximately 50 yards of soil is contaminated above 77 mg/kg and evaluated several different remedies for treatment including excavation and off-site disposal/treatment. Staff requested the Air Force evaluate the feasibility of cleaning the PCB-contaminated soil to 1 mg/kg and 10 mg/kg, in addition to the 77 mg/kg cleanup level. Additionally, staff commented that general DEC policy requires a soil cap on any PCBs left in place above 1 mg/kg. Staff requested additional evaluation of the petroleum contamination at the site. |
Emily Youcha |
| 5/25/2006 |
Meeting or Teleconference Held |
Contaminated Sites staff participated in a comment-resolution meeting for a feasibility study at Indian Mountain Long Range Radar Station Upper Camp site OT08, which has polychlorinated biphenyl (PCB) contaminated surface soil. Staff requested further evaluation of cleanup options to 1 mg/kg in addition to the risk-based alternative cleanup level of 77 mg/kg. The Air Force responded that they may not have enough funding for further evaluation of cleanup levels. Staff also indicated that DEC will require a soil cap on contamination above 1 mg/kg and the Air Force requested written documentation of this requirement. Staff will arrange a meeting with DEC supervisors to further discuss the issues at this site. |
Emily Youcha |
| 6/8/2006 |
Meeting or Teleconference Held |
Staff met with DEC manager to discuss institutional controls at this site. DEC will require ICs and engineering controls according to 18 AAC 75.375 to be protective of human health and the environment. A cap will be required on any PCB contamination left in place between 1-77 mg/kg in order to eliminate migration of PCBs from erosion. |
Emily Youcha |
| 12/5/2006 |
Update or Other Action |
DEC staff Tamar Stephens reviewed and sent comment letter on Final Focused Feasibility Study (FFS). The final FFS does not adequately address some significant concerns in DEC comments on the draft FFS, and therefore lacks important information for making valid site decisions. Final FFS does not recommend a preferred remedy for the site. DEC concerns listed in comment letter: (1) The FFS proposes cleanup level of 77 mg/kg based on risks calculated for site workers or visitors, thus will require engineering and institutional controls in accordance with 18 AAC 75.375, conformance with 18 AAC 60 and 18 AAC 63 Article 2, and will require at a minimum a two-foot-thick soil cap, institutional controls, and long term monitoring and maintenance of the soil cap. (2)Characterization of this site is limited, particularly subsurface soil where fines would be found. (3) DEC comments on the draft FFS report asked for an evaluation of the costs and benefits of cleaning up to 1 mg/kg (residential) and 10 mg/kg (commercial/industrial) to provide information on costs of doing additional cleanup versus costs of engineering and institutional controls; this evaluation was not done in the final report. (4) FFS fails to provide actual costs of some of the remedies. (5) FFS does not address whether proposed remedies will provide protection from off-site migration resulting from upgradient petroleum-contaminated water flowing through the site. |
Tamar Stephens |
| 3/28/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
Tamar Stephens |
| 2/5/2010 |
Document, Report, or Work plan Review - other |
Reviewed and rejected draft Proposed Plan because the proposed remedy, institutional controls, is not protective of human health or the environment and does not comply with regulations. |
Tamar Stephens |
| 8/8/2011 |
Document, Report, or Work plan Review - other |
Reviewed and sent comments on pre-draft 2011 Remedial Investigation Work Plan for Sites OT008 and SS010. The following activities are proposed. (1) Sampling at site OT008, consisting of the former White Alice Site, a former pump house near the upper camp area, and a stained pit area at upper camp. These three areas have been confirmed to have polychlorinated biphenyl (PCB) and petroleum contaminated soil. Proposed sampling will better delineate the extent of contamination. (2) Sampling of surface water and sediment samples from surface seeps associated with site SS010. SS010 is at the upper camp area above the shelf where OT008 is located. (3)Evaluation of the effectiveness of the cut-off trench associated with the SS010 seeps. |
Tamar Stephens |
| 1/12/2012 |
CERCLA RI Plan Approved |
Approved final 2011 Remedial Investigation Work Plan for Sites OT008 and SS010. |
Tamar Stephens |
| 2/6/2012 |
Document, Report, or Work plan Review - other |
Reviewed and sent comments on draft Follow-on Remedial Investigation Report for Sites OT008 and SS010. |
Tamar Stephens |
| 5/1/2012 |
CERCLA RI Report Approved |
Approved final Follow-on Remedial Investigation Report for Sites OT008 and SS010. Based on sampling results, this report estimates the following volumes of soil exceed cleanup levels at OT008. (1)White Alice Site: 1,485 cubic yards of soil with PCBs and/or comingled PCBs and petroleum (diesel range organics), and 419 cubic yards of soil with only petroleum contamination. (2) Stained Soil Area: 11 cubic yards of soil with PCBs comingled with petroleum (diesel range organics). (3)Pump House: 2 cubic yards of soil with PCBs comingled with petroleum. |
Tamar Stephens |
| 5/3/2012 |
Document, Report, or Work plan Review - other |
Reviewed draft Feasibility Study for OT008. This report screens and evaluates remedial alternatives for cleanup of soil contaminated with polychlorinated biphenyls (PCBs) and/or petroleum at the Indian Mountain Long Range Radar Station, at site OT008, which consists of the former While Alice communications site, located in the Upper Camp area, and two smaller areas, a former pump house and a stained soil area, also in the Upper Camp area. |
Tamar Stephens |
| 7/6/2012 |
CERCLA FS |
Approved Indian Mountain Long Range Radar Site Final Feasibility Study for Site OT008 (June 2012). The remedial alternatives evaluated to address PCB contaminated soil are: (1) No action; (2) Offsite disposal of PCB-contaminated soil greater than 1 mg/kg; (3) Grain size separation and off-site disposal of PCB-contaminated soil greater than 1 mg/kg; and (4) Grain size separation and off-site disposal of PCB-contaminated soil greater than 25 mg/kg and solidification and capping of PCB contaminated soil between 1 and 24.9 mg/kg. The remedial alternatives evaluated to address petroleum contaminated soil are: (1) No action; (2) Grain size separation and onsite landspreading of petroleum, oil, and lubricant contaminated soil above the direct contact cleanup level; and (3) Grain size separation and off-site disposal of petroleum, oil, and lubricant contaminated soil above the direct contact cleanup level. |
Tamar Stephens |
| 11/16/2012 |
CERCLA Proposed Plan |
DEC approved the Air Force Proposed Plan for Indian Mt OT008. The selected remedy calls for grain size seperation and off-site disposal of PCB contaminated soil containing > 1 mg/kg PCB and grain size separation and landfarming for petroleum contaminated soil. |
John Halverson |
| 3/26/2013 |
Update or Other Action |
DEC received a draft ROD for Indiant Mt OT008. Subsequently the Air Force contacted DEC and requested the ROD review be put on hold as the AF is re-evaluating its preferred remedy. |
John Halverson |
| 12/23/2013 |
Update or Other Action |
Site transferred to Guy Warren. |
Rebecca Bryan |
| 1/14/2015 |
Update or Other Action |
Submit comments on the Draft Feasibility Study (FS) for Site OT008. US Air Force updated FS to address changes to anticipated soil volumes and to evaluate additional remedial alternatives. |
Guy Warren |
| 4/10/2015 |
CERCLA FS |
Received Final FS for Indian Mountain LRRS Site OT008. The FS evaluates various alternatives for addressing PCB and petroleum contamination remaining at the site. PCB alternatives range from off-site disposal to onsite consolidation and capping of PCB contaminated soil. |
Guy Warren |
| 5/19/2015 |
Update or Other Action |
Submit approval letter for OT008 Feasibility Study to US Air Force. |
Guy Warren |
| 9/7/2016 |
Document, Report, or Work plan Review - other |
The AF provided the draft OT008 ROD and RTCs on August 29, 2016. ADEC provided additional questions and requested clarification on several AF responses on September 7, 2016. ADEC is presently waiting on those responses before requesting a final copy of the OT008 ROD for approval. |
Holly Weiss-Racine |
| 6/30/2017 |
Document, Report, or Work plan Review - other |
The Final Record of Decision (ROD) for Indian Mountain LRRS site OT008, was signed on this date. The ROD explains that during previous investigations polychlorinated biphenyls (PCBs) and diesel range organics (DRO) were the primary contaminants in the soil above ADEC cleanup levels. The selected remedy for PCB contaminated soil includes onsite consolidation and capping. Onsite landfarming will address the DRO issue. The selected remedy if implemented correctly, should address both the PCB and DRO contamination, as well as other potentially commingled contaminants. |
Kim DeRuyter |
| 9/19/2017 |
Document, Report, or Work plan Review - other |
DEC has approved the 'Final Supplemental Work Plan 2017-2018 Remedial Action Operations, Land Use/Institutional Control, Indian Mountain Long Range Radar Station (LRRS), dated September 2017. This Work Plan presented long-term monitoring (LTM) activities at nine Indian Mountain LRRS sites; LF004, LF005, LF006, SD001, SS002, SS009, SS010, SS011 and OT008. LTM activities were; institutional control inspections [land use control (LUC) inspections and installation of signs] at all sites, analytical groundwater, surface water and sediment sampling at Site LF004, and analytical groundwater sampling at Site SS009. |
Erica Blake |
| 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 |
| 6/10/2019 |
Document, Report, or Work plan Review - other |
Report approved: 2017-2018 long term monitoring (LTM) activities at the Indian Mountain LRRS site which is located 18 miles east of Hughes, Alaska. Eight sites are included in this report; LF004, LF005, LF006, SS002, SS009, SS010, SS011 and OT008. Sites SS010 and OT008 are located in an area called Upper Camp and sites LF004, LF005, LF006, SS002, SS009, and SS011 are located in an area called Lower Camp. Groundwater and water samples from LF004 showed no exceedances for metals, although sediment samples showed lead over the probable effects level. Groundwater samples from SS009 showed exceedances of DRO and TCE. DRO contamination was stable or decreasing, but TCE was found to be increasing. The institutional control (IC) inspection found that IC’s were properly in place. One groundwater monitoring well had no water and thus was not sampled. |
Kevin Fraley |
| 6/11/2019 |
Document, Report, or Work plan Review - other |
A 2019 supplemental work plan was approved, and presents proposed 2019 work and institutional control inspections at Indian Mountain Long Range Radar Station sites SS002, LF004, LF005, LF006, SS009, SS010, SS011, and OT008. Groundwater samples will be collected from monitoring wells at site SS009 and analyzed for diesel range organics (DRO) and trichloroethylene (TCE). Additionally, an institutional control inspection will be conducted at sites SS002, LF004, LF005, LF006, SS009, SS010, SS011, and OT008.
|
Kevin Fraley |
| 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 OT008 WACS, Pump House, and Stained Soil sites were visited and land use control signage was in place. |
Kevin Fraley |
| 10/30/2019 |
Meeting or Teleconference Held |
A scoping teleconference was held with USAF and contractors to discuss 2020 activities at this site in advance of a work plan being prepared. PCB and POL contaminated soil will be excavated and removed or capped at the WACS site, pending the appropriate steps being taken to modify the ROD remedy. |
Kevin Fraley |
| 6/19/2020 |
Offsite Soil or Groundwater Disposal Approved |
Soil transport request approved. |
Eric Breitenberger |
| 7/25/2020 |
CERCLA SI |
DEC approved the “Final Perfluorooctanoic Acid, Perfluoroctane Sulfonate, and Perfluorobutane Sulfonate Site Inspections, Uniform Federal Policy-Quality Assurance Project Plan Work Plan, Six Remote Radar Stations, Alaska” dated July 2020. This work plan was prepared by United States Air Force to guide investigation of the potential presence of perfluorooctanoic acid (PFOA), perfluorooctane sulfonate (PFOS), and perfluorobutane sulfonate (PFBS) at six remote radar sites in Alaska through the sampling of surface water, groundwater, soil and sediment. Sampling is planned for Cape Newenham, Cape Romanzof, Indian Mountain, Point Barrow, Sparrevohn and Tatalina, |
Melinda Brunner |
| 8/5/2020 |
Document, Report, or Work plan Review - other |
DEC received and provided comments for the 2020 Draft Supplemental Work Plan for sites LF004, LF005, LF006, SS002, SS009, SS010, SS011, and OT008. Work mainly involved IC management such as inspecting landfill caps. 5 monitoring wells will be sampled for DRO and TCE at SS009. DEC requested that debris exposed by erosion at LF004 be removed, as recommended by the 2019 Report. No other comments were necessary. |
Tim Sharp |
| 9/1/2020 |
Document, Report, or Work plan Review - other |
DEC Approved the 2020 Final Supplemental Work Plan for Remedial Action Operations, Land Use/Institutional Controls at LF004, LF005, LF006, OT008, SD001, SS002, SS009, SS010, and SS011. The Proposed LTM and LUC/IC inspection activities include sampling 5 groundwater monitoring wells for analysis of DRO and TCE at SS009, landfill cap inspection at LF004 and LF005, and general IC inspections at all sites. Debris removal from LF004 due to erosion is scheduled to occur in 2021. |
Tim Sharp |
| 2/9/2021 |
Lien Recorded |
On February 9, 2021 Notice of environmental Contamination was recorded for OT008. Summarizing the residual contamination at the site and Institutional Controls in place. |
Daniela Fawcett |
| 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 |
| 4/14/2021 |
Document, Report, or Work plan Review - other |
DEC sent comments on the 2020 RAO LUC/IC Report for LF004, LF005, LF006, OT008, SD001, SS002, SS009, SS010, and SS011. The majority of these sites were subject to basic IC monitoring such as sign maintenance and cap inspections. Site specific information in next comment. |
Tim Sharp |
| 4/14/2021 |
Document, Report, or Work plan Review - other |
Recommendations include discouraging site use and continuing inspections. |
Tim Sharp |
| 5/12/2021 |
Document, Report, or Work plan Review - other |
DEC sent comments for the Draft Work Plan RAO/LTM. The report details current conditions at several sites. It proposes LUC and IC inspections, landfill inspections, MW repairs, and MW sampling at LF004 and SS009. The majority of the comments focused on discrepancies between the unfinalized 2020 LTM Report and this 2021 LTM WP. DEC intends to approve a final report before finalizing the work plan if at all possible. |
Tim Sharp |
| 5/18/2021 |
Institutional Control Periodic Reporting |
DEC Approved the Final 2020 RAO LUC/IC Report for sites LF004, LF005, LF006, OT008, SD001, SS002, SS009, SS010, and SS011. Recommendations for each site stayed largely the same as indicated previously. |
Tim Sharp |
| 7/12/2021 |
Document, Report, or Work plan Review - other |
DEC Approved the Final 2021 RAO and LTM Work Plan, with the understanding that several DEC recommendations put forward will be taken into consideration under a separate contract. This includes drum removal, potential installation of additional monitoring wells, and erosion control methods. |
Tim Sharp |
| 11/18/2021 |
Update or Other Action |
DEC sent comments for the Explanation of Significant Differences (ESD) for site OT008. USAF discovered 466 cy of DRO-impacted soil that wasn’t identified in the ROD that also contains PCBs below 10 mg/kg, meaning they can’t landfarm it. They are planning to, instead of landfarming (as was the original intention with DRO-impacted soil), they will combine it with other PCB contaminated soil and cap it all. This will eliminate any landfarming plans and change to just capping 66,000 sq ft. As the site has an NEC filed Feb 2021, no UECA NAUL is necessary. |
Tim Sharp |
| 12/3/2021 |
Update or Other Action |
DEC approved the Final ESD for OT-008, which proposes to combine an additional 466 cubic yards (cy) of contaminated soil containing polychlorinated byphenyls (PCBs) with the other PCB contaminated soil present on the site to be capped. This will eliminate any landfarming plans and increase the capped area to 66,000 square feet. |
Tim Sharp |
| 2/9/2022 |
Update or Other Action |
DEC signed the Final ESD after all other signatures were acquired and the document was compared to the approved Final ESD. |
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 |
| 6/12/2023 |
Document, Report, or Work plan Review - other |
DEC reviewed and provided comments regarding the Draft Final Remedial Action-Operation and Long-Term Management Report Indian Mountain Long Range Radar Site Sites LF004, LF005, LF006, OT008, SD001, SS002, SS009, SS010, and SS011, dated May 2023.This report describes the long-term management and remedial action-operation activities performed at sites LF004, LF005, LF006, OT008, SD001, SS002, SS009, SS010, and SS011 at the Indian Mountain Long Range Radar Site (LRRS) during August of 2022. The report recommends continued monitoring at all the sites and the replacement of land use control signs at the LF006 and SS009 sites. |
Ginna Quesada |
| 8/31/2023 |
Document, Report, or Work plan Review - other |
DEC provided comments for the draft Notice of Activity and Use Limitations (NAUL) to the U.S. Air Force. Polychlorinated biphenyls (PCBs) and diesel range organics (DRO) remains in the soil above human health levels. |
Erica Blake |
| 9/6/2023 |
Document, Report, or Work plan Review - other |
DEC received a redlined version of the draft Notice of Activity and Use Limitations (NAUL). All comments were addressed, and DEC accepted the redline requesting a clean final for approval. |
Erica Blake |
| 9/12/2023 |
Document, Report, or Work plan Review - other |
DEC provided an approval letter for the Notice of Activity and Use Limitations (NAUL) for Indian Mountain Long Radar Range Station (LRRS) site OT008. All revisions were incorporated as requested. DEC approved the final document requesting a final version for signature. |
Dennis Shepard |
| 9/13/2023 |
Document, Report, or Work plan Review - other |
DEC submitted responses to comments regarding the redline Final Remedial Action-Operation and Long-Term Management Report Indian Mountain Long Range Radar Site Sites LF004, LF005, LF006, OT008, SD001, SS002, SS009, SS010, and SS011, Dated September 2022. |
Ginna Quesada |
| 10/12/2023 |
Document, Report, or Work plan Review - other |
DEC approved the Final Remedial Action-Operation and Long-Term Management Report Indian Mountain Long Range Radar Site Sites LF004, LF005, LF006, OT008, SD001, SS002, SS009, SS010, and SS011, dated October 2023. |
Ginna Quesada |
| 5/8/2024 |
Document, Report, or Work plan Review - other |
DEC provided comments for Draft-Final 2023 Five-Year Review Report For LF004, LF005, LF006, SS002, SS010, SD011, SD001, And OT008 At Indian Mountain Long Range Radar Station, Alaska (not dated). Draft was received on April 15, 2024. This was the first Five-Year Review for SD001, SD011, and OT008 and the second for LF004, LF005, LF006, SS002 SS009, and SS010. There are several comments where DEC disagrees with the response and is asking for additional clarification. |
Brian Watts |
| 5/29/2024 |
Document, Report, or Work plan Review - other |
Responded to comments for Draft Final 2023 Five-Year Review for LF004, LF005, LF006, SS002, SS009, SS010, SS011, SD001, and OT008 at Indian Mountain Long Range Radar Station, Alaska (undated). There are comments where DEC continues to disagree and others requiring information and clarification. |
Brian Watts |
| 7/2/2024 |
Document, Report, or Work plan Review - other |
DEC provided final comments and approval for the Final 2023 Five-Year Review Report For LF004, LF005, LF006, SS002, SS009, SS010, SS011, SD001, and OT008 At Indian Mountain Long Range Radar Station, Alaska (undated). DEC accepts all comments with the expectation that Notices of Activity Use and Limitations (NAULs) be created for sites with remaining contamination. |
Brian Watts |
| 9/19/2024 |
Document, Report, or Work plan Review - other |
DEC provided comments and responses to comments for the Draft Final 2023 Remedial Action-Operation and Long-Term Management Report Indian Mountain Long Range Radar Site Sites LF004, LF005, LF006, OT008, SD001, SS002, SS009, SS010, and SS011, dated August 2024.This report describes the long-term management and remedial action-operation activities performed at sites LF004, LF005, LF006, OT008, SD001, SS002, SS009, SS010, and SS011 at the Indian Mountain Long Range Radar Site (LRRS) during September of 2023. The report recommends continued monitoring at all the sites and the installation of additional land use control signs at the SD001. The report also recommended the decommissioning of the monitoring wells SS09-MW01 and SS09-MW04R at the SS009 site. |
Ginna Quesada |
