Division of Spill Prevention and Response

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Site Report: Big Mountain RRS LF005


Site Name: Big Mountain RRS LF005
Address: LF005 Landfill aka POI-5, Iliamna, AK 99606
File Number: 2518.38.001
Hazard ID: 77
Status: Cleanup Complete - Institutional Controls
Staff: Linda (Qi) Liu, linda.liu@alaska.gov
Latitude: 59.390833
Longitude: -155.225833
Horizontal Datum:


We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.


Problems/Comments

The Big Mountain Radio Relay Station (RRS) is located approximately 220 air miles southwest of Anchorage, AK on the southern shore of Iliamna Lake. The RRS consisted of two main camp areas referred to as the Lower Camp and the Upper Camp. The Lower Camp facility included a gravel airstrip and former operational support facilities. The Upper Camp was an antennae array and support facilities, including living quarters for site personnel who supported the installation’s operational mission. The landfill was used during the facility operation. Since it is no longer in use, the landfill has been covered and graded over. The landfill limits are confined by a beaver pond to the north, a steep glacial moraine to the south, and a creek to the west that emanates from the beaver pond and flows away from the landfill area. The landfill was capped with material from a local borrow source when it was closed in 1979. The landfill was again capped in 2004 and seeded with native vegetation. Approximately 117 cubic yards of PCB contaminated soil was removed from the site during removal actions in 2011 and 2012. The contaminated soil was placed in an onsite industrial landfill (SS014). The excavated area was backfilled and contoured after the removal. Contamination remains onsite at the landfill. Approximately 1,500 cubic yards of sediment is contaminated with pesticides and PCBs, and an undetermined volume of groundwater is contaminated with VOCs. The landfill requires institutional controls and long-term monitoring of the sediment and groundwater. Former file number 2518.38.004 consolidated with 2518.38.001.



Action Information

Action Date Action Description DEC Staff
6/13/1988 Update or Other Action Hazardous Materials Technical Center Preliminary Assessment identified small quantities of hazardous materials at site. Several lead-acid batteries were observed ruptured from being frozen, asbestos tiling in various stages of decomposition due to reaction from spilled chemicals were found on building floors. A mound 4' above surrounding landscape may be a landfill site or burial site for construction debris. No organic vapors were detected with PID and no hazardous wastes were reported to have been disposed of in this area. No Longer Assigned
5/4/1989 Preliminary Assessment Approved Preliminary Assessment (dated April 1989) prepared for HQ AAC/DEPV and by Hazardous Materials Technical Center; received by ADEC on May 4, 1989. Gretchen Pikul
2/5/1997 Update or Other Action Final Environmental Assessment Big Mountain Radio Relay Station Demolition (dated October 1996) received on February 5, 1997. Gretchen Pikul
10/29/1997 Update or Other Action Final Management Action Plan (dated October 24, 1997). Gretchen Pikul
1/9/1998 Site Added to Database Site added by staff. Gretchen Pikul
6/15/1998 Update or Other Action ADEC participated in a site visit. Gretchen Pikul
7/15/1998 Update or Other Action Community Relations Plan (dated July 1998). Gretchen Pikul
7/20/1998 Meeting or Teleconference Held Preliminary Draft: Human Health and Ecological Risk Assessment Work Plan comment resolution meeting and workplans were not approved. Gretchen Pikul
7/24/1998 Site Characterization Workplan Approved Remedial Investigation / Feasibility Study work plans (draft version dated June 1998, final version dated August 1998 and received on October 4, 1999). Gretchen Pikul
8/6/1998 Meeting or Teleconference Held ADEC participated in public meetings regarding the RI/FS workplan in Iliamna/New Halen on August 6 and in Kokhanok on August 7. Gretchen Pikul
5/3/1999 Update or Other Action ADEC review and comment on 1st draft version of RI/FS report - report not complete, therefore ADEC review not complete. Gretchen Pikul
5/6/1999 Update or Other Action Site Characterization Technical Memorandum (dated December 1998); received by ADEC on May 6, 1999. Gretchen Pikul
10/1/1999 Update or Other Action ADEC review and calls on 2nd draft RI/FS version. A complete ADEC review and comment letter cannot be produced until necessary information and tables (requested in May 1999) are forwarded. Gretchen Pikul
10/26/1999 Meeting or Teleconference Held ADEC participtated in a meeting regarding 2nd draft RI/FS version (dated July 1999). A complete ADEC review and comment letter cannot be produced until necessary information and tables (requested in May 1999) are forwarded. December 20, 1999 ADEC received some of the requested data from the October meeting. Gretchen Pikul
11/10/1999 Update or Other Action ADEC review and comment on Risk Assessment portions of RI/FS (dated June 1999); please note that ADEC did not approve the risk assessment workplan and the decision during the comment resolution meeting was to set aside the risk assessment until it was determined whether or not one would be necessary, based on the future RI/FS data. These risk assessment portions of the RI/FS were also not approved by ADEC; risk assessment fundamentals were missing in the report. Gretchen Pikul
3/8/2000 Meeting or Teleconference Held Comment resolution meeting for Risk Assessment portions of RI/FS on 3-8-00 - decision to consider report a risk evaluation instead of a risk assessment - Air Force not ready to address ADEC comment letter dated 11-99, but discussed general direction - human health risk evaluation needs extensive reworking. Gretchen Pikul
4/7/2000 Update or Other Action ADEC comment letter on 2nd version of draft RI/FS. Gretchen Pikul
6/7/2000 Update or Other Action ADEC sent out community update letter. Gretchen Pikul
7/20/2000 Update or Other Action Hazardous Substances Investigation at Big Mountain White Alice Communication Systems Site (dated August 1983) prepared for the Village of Levelock and by DOWL Engineers; received by ADEC on July 20, 2000. Gretchen Pikul
7/20/2000 Update or Other Action Draft Preliminary Assessment Report (dated February 12, 1993, no final submitted) prepared for USAF 11 CEOS/DEVR and by Science Applications International Corporation; received by ADEC on July 20, 2000. Gretchen Pikul
7/20/2000 Update or Other Action Proposed Big Mountain Communication Relay Station - Final Environmental Baseline Survey Report (dated September 1995) prepared for Bristol Bay Housing Authority and by DOWL Engineers; received by ADEC on July 20, 2000. Gretchen Pikul
8/28/2000 Meeting or Teleconference Held ADEC participated in 2 meetings (August 25 and 28) with Air Force, COE and their consultant for update and discussion of project general direction. Gretchen Pikul
8/29/2000 Meeting or Teleconference Held ADEC participated in public meetings in Iliamna. Gretchen Pikul
4/15/2001 Update or Other Action Final RI/FS report (dated Feburary 2001) received February 21, 2001; ADEC comment letter dated April 15, 2001 - still outstanding issues not addressed in this 3rd version; contract end, this version considered final and ADEC comment letter listing outstanding issues is attached. Gretchen Pikul
10/10/2001 Update or Other Action Year 2000 Clean Sweep Environmental Survey Report (dated August 20, 2001) received on October 10, 2001. Gretchen Pikul
12/4/2001 Meeting or Teleconference Held July 31, 2001 meeting with Air Force to discuss general project direction and upcoming Proposed Plans and Decision Documents; November 21, 2001 (electronic copy) and November 29, 2001 (hard copy) received Preliminary Draft Proposed Plan; comment resolution meeting on December 4, 2001; draft final version anticipated by end of December. Gretchen Pikul
1/24/2002 Proposed Plan Proposed Plan for 6 sites: Interim Remedial Actions for ST001, SS002, LF005, and SS014; Site Closure for SS013 and SS015. Draft Preliminary Proposed Plan received on November 29, 2001; ADEC comments dated December 3, 2001; comment resolution meeting December 4, 2001; Draft final received January 10, 2002; ADEC internal briefing and comment resolution meeting on January 11, 2002; Final Proposed Plan dated January and received January 24, 2002; public comment period January 21 - February 22, 2002, but extended to April 1, 2002; public meetings held in Iliamna on January 30, 2002 and in Kokhanok on February 19, 2002. Gretchen Pikul
12/3/2002 Record of Decision The Final Record of Decision was signed by ADEC on December 3, 2002. The migration to groundwater cleanup level for soil was applied. The interim remedy for ST001, SS002, and SS014 is excavation and thermal treatment of the DRO-contaminated soil. Further investigation of groundwater conditions and potential impacts to nearby wetlands will also be performed. The interim remedy for LF005 is a limited landfill cap. An ecological risk assessment and annual long-term monitoring of groundwater, surface water, and sediment will be performed at LF005 and ST001. A 5-year review will be conducted for all 4 interim remedial action sites. The Final Decision Documents for these interim remedial action sites will address the any remaining contamination discovered by the additional investigation activities. Gretchen Pikul
5/12/2003 Meeting or Teleconference Held Meeting on draft newsletter and 2003 field work. Gretchen Pikul
6/5/2003 Meeting or Teleconference Held ADEC participated in public meetings at Iliamna and Kokhanok, and a site visit. Gretchen Pikul
6/12/2003 Update or Other Action The Big Mountain RRS Newsletter (draft received May 26, 2003; ADEC comments on May 27, 2003; final dated May 31, 2003 and received June 12, 2003). Gretchen Pikul
7/2/2003 Meeting or Teleconference Held ADEC participated in meeting for 2003 work plan and 2004 scope of work; draft work plan is due July 15. Gretchen Pikul
9/26/2003 Update or Other Action Work Plan Clean Sweep Demolition - Phase I (draft dated May 19, 2003; final dated August 27 and received September 26, 2003). Gretchen Pikul
11/13/2003 Update or Other Action The Big Mountain RRS Newsletter (dated October 13, 2003) received on November 13, 2003. Gretchen Pikul
11/13/2003 Meeting or Teleconference Held Meeting on 2003 field work and results: RI findings and data gaps; Feasibility Study and cleanup volumes; 2004 sampling to fill data gaps and refine cleanup; and POL remedial options. Remediation projects have been delayed until 2005 due to funding. Gretchen Pikul
2/6/2004 Update or Other Action Clean Sweep Demolition Volume 1 – Phase I Report (final dated February 6, 2004; draft called Interim Report Clean Sweep Demolition - Phase I, dated October 31, 2003, and received on November 5; ADEC approval letter dated November 10, 2003). Gretchen Pikul
6/7/2004 Update or Other Action Clean Sweep Phase 2 work plan; draft dated May 7, 2004 and received on May 10, Air Force requested expedited review; ADEC sent comments via e-mail on May 21, 2004; ADEC received Air Force Comment Response on June 3, and sent approval letter on June 4; final dated June 2 and received on June 7. Gretchen Pikul
6/24/2004 Update or Other Action 2004 Remedial Investigation / Feasibility Study and Environmental Monitoring work plan; draft dated and received on June 14, expedited review requested by Air Force; ADEC comment letter dated June 24. Gretchen Pikul
9/2/2004 Update or Other Action Ecological Risk Assessment (Sites: 42,000-gallon fuel oil AST (ST001) and Landfill (LF005) work plan; draft dated and received electronic version on May 14, 2004; ADEC received the Air Force Comment Response on June 8; comment resolution teleconference on June 15; Air Force final Comment Response and draft final ERA work plan received on June 22; ADEC final comments sent June 24; ADEC received final ERA work plan on July 2. Gretchen Pikul
11/10/2005 Update or Other Action Phase 2 Clean Sweep Demolition Report for Big Mountain RRS; draft dated January 2005 submitted December 2, 2004; ADEC approval letter dated March 14, 2005; Final dated March 11 received November 10, 2005. Jeff Norberg
2/3/2006 Update or Other Action Report - Ecological Risk Assessment [Sites: 42,000-gallon fuel oil AST (ST001) and Landfill (LF005)]; draft ERA dated August 12, 2005 received November 7, 2005; meeting with Air Force and contractor to discuss review of draft RI/FS and ERA on January 25, 2006; ADEC comment letter dated January 26; Comment Response on January 31; ADEC approval via email issued February 1; Final ERA report dated February 3, 2006. (also see entry for February 14, 2006) Jeff Norberg
2/14/2006 Update or Other Action Remedial Investigation Report for Sites ST001, SS002, SS003, SS004, SS011, and LF005; draft RI dated April 15, 2005 received June 8; ADEC review on-hold pending submittal of Ecological Risk Assessment for Sites ST001 and LF005; Air Force submitted ERA dated August 12, 2005 received November 7, 2005; meeting with Air Force and contractor to discuss review of draft RI/FS and ERA on January 25, 2006; ADEC comment letter dated January 26; Comment Response on January 31; ADEC approval via email issued February 1; Final RI/FS report dated February 10, 2006 received February 14. Jeff Norberg
3/18/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Jonathan Schick
4/1/2008 Update or Other Action Staff submitted comments on the 2006-2007 Environmental Monitoring Report for sites LF005, ST002, and SS001. The Draft version of the Report was recieved on March 12, 2008. Jonathan Schick
5/6/2008 Update or Other Action File number changed from CS77.08-1 to 2518.38.004. Nicole Hurt
7/15/2008 Site Visit ADEC staff conducted a site visit at the Big Mountain RRS and inspected all of the sites that have been documented at the Radio Relay Station(RRS). USAF staff and their contractores accompanied ADEC staff on the site visit. Community meetings were organized to talk to citizens in the surrounding communities about the environmntal restoration work that is on-going at the Big Mountain RRS. Jonathan Schick
8/6/2008 Site Characterization Workplan Approved ADEC staff approved the work plan for site monitoring activities at the LF005 site at Big Montain RRS. The approval was conditional on including additional surface soil samples and one -two additional sediment sample sin the beaver pond adjacent to the land fill area. Jonathan Schick
2/20/2009 Update or Other Action ADEC recieved a copy of the Draft Environmental Monitoring Report for LF005. The report summarizes the findings and observations from the annual landfill inspection and sampling and analysis of th groundwater, surface water and sediment. Jonathan Schick
3/5/2009 Update or Other Action ADEC reviewed and submitted comments on the Draft Environmental Monitoring Report for Site LF005 at Big Mountain. The State is concerned about the levels of PCBs in the sediments adjacent to the landfill and beaver pond. The state also has concerned about some of the storage practices with regards to the sampling equipment. Jonathan Schick
3/17/2009 Update or Other Action ADEC recieved response to comments from the LF005 Monitoring Report. A meeting will be scheduled to discuss the items that still need attention. Jonathan Schick
3/24/2009 Update or Other Action ADEC recieved a copy of the final version of the Big Mountain LF005 Environmental Monitoring Report. Submitted comments were resplved in a mereting and monitoring will continue to address the potential contaminant leaching from the landfill into the adjacent wetland. Jonathan Schick
3/24/2009 Update or Other Action ADEC recieved a copy of the final version of the Big Mountain LF005 Environmental Monitoring Report. Submitted comments were resplved in a mereting and monitoring will continue to address the potential contaminant leaching from the landfill into the adjacent wetland. Jonathan Schick
8/20/2009 Update or Other Action Air Force contractor traveled to the Big Mountain RRS to conduct long term monitoring sample collection at the Landfill LF005. THe contractor was also tasked with locating adn characterizing the contents of a barrel that had been previosly identified in the Beaver Dam adjacent to the Landfill. Jonathan Schick
11/5/2009 Update or Other Action ADEC staff recieved a copy of te Draft Long Term Monitoring Report for LF005 at Big Mountain. The contractor collected samples from 5 monitoring wells, 5 surface water samples and 5 sediment samples as well as 4 surface soil samples. The results show that low level PCB contamiation is present in the surface soils at 2 of the 4 surface soil locations and at two of the sediment sample locations. Additionally, 1,3 DCB and 1,4 DCB were found to exceed the groundwater cleanup level at one monitoring well. Jonathan Schick
11/18/2009 Update or Other Action ADEC submitted comments on the Draft Long Term Monitoring Report for LF005. The State expressed concern about the DCB that is impacting the groundwater at one monitoring well location, as well as the persistent PCB detections. The 5 year review for this site is due in the near future and the State is waiting to see what the recommendaitons are in that document. The majority of the comments were editorial in nature. Jonathan Schick
3/30/2010 Update or Other Action ADEC Staff recieved a copy of the Draft Five-Year Review Report for Landfill LF005 for our review. Jonathan Schick
4/28/2010 CERCLA ROD Periodic Review ADEC submitted comments on the Draft 5-year review report for the Landfill LF005 site at the lower camp at Big Mountain. The State's main concern with the document is that it did not adequately address the State's concerns regarding the development and implementation of Institutional Controls. Additionally, there were other sites involved in the Interim Record of Decision associated with this 5-year review that were not addressed in this document and will need to be reviewed in another draft of this 5-year review or under a separate cover. Jonathan Schick
6/10/2010 Update or Other Action ADEC recieved response to comments on the Five Year Review document for LF005. Responses seem acceptable and the document will be sent up for signature. Jonathan Schick
9/16/2010 Site Visit Contaminated Sites staff travelled to Big Mountain Radio Repeater Site via Navajo on Thursday Septermber 16 to look at the various contaminated sites and to perform a fieldwork oversight inspection. The contractors on-site demonstrated an understanding of the workplan and of the tasks that were being conducted at the site during the visit. These activities included collection of a Multi-Incrimental sample from a treatment stockpile at lower camp, completion of a newly installed groundwater monitoring well at LF005 and collection of step-out samples to delineate the extent of PCB impacts on the mountain top at SS010. The landfill caps appear to be in good condition with no observed cracking or carsting. However, the runway at lower camp is being used for unauthorized purposes (i.e. hunter staging area) and access controls should be revisited for this site. Jonathan Schick
2/18/2011 Update or Other Action Contaminated Sites Staff recieved the Draft Initial Screening of Alternativesfor Big Mountain Sites LF005, ST001, SS010a and SS010b (aka SS009). Jonathan Schick
4/4/2011 Update or Other Action Contaminated Sites Staff recieved a Draft copy of the Long Term Monitoring Report for LF005 and ST001 at Big Mountain. The LTM report details the results of the 2010 field work that included groundwater, surface water, sediment, and surface soil. THe surface soil sampling was an effort to delineate the extent of the PCB impacts in the vicinity of MW-06 at LF005 and along the conatinment berm at ST001. Jonathan Schick
4/4/2011 Update or Other Action Contaminated Sites Staff recieved a Draft copy of the Supplemental Field Investigation Report that addressed samples collected during the 2010 field event at LF005, ST001, SS010a and SS010b. The work also included collecting survey data to document the boudaries of sites SS002 and SS014 for the purpose of the Institutional Controls for the site. The main objective of the work was to delineate the PCB impacted soils at SS010a and SS010b for the proposed excavation work scheduled to be conducted in 2011. Jonathan Schick
4/7/2011 Update or Other Action Contaminated Sites Staff submitted a letter to the USAF with comments on the Draft Initial Screening of ALternatives Document. The State's main concerns were regarding the lack of analysis of the alternative that ADEC and USAF had discussed in scoping which proposed removing all of the PCB impacted soils from the sites and creating a new landfill where the soils impacted from 1 to 10 parts per million would be contained. Additional concerns were commented on regarding the land use as a subsistence hunting and gathering area, as well as other technical issues. Jonathan Schick
4/8/2011 Update or Other Action Contaminated Sites Staff submitted a letter to the 611th CES Remedial Project Manager with comments on the Draft Long Term Monitoring Report for LF005 and ST001 at Big Mountain. The LTM report details the results of the 2010 field work that included groundwater, surface water, sediment, and surface soil. THe surface soil sampling was an effort to delineate the extent of the PCB impacts in the vicinity of MW-06 at LF005 and along the conatinment berm at ST001. Our concerns were concerning the incomplete delineation of the PCB soils at LF005 and the trend of chlorinated hydrocarbons being observed in the groundwater. The DRO concentration at ST001 has dropped below the cleanup level, however, another round of sampling demonstrating that the DRO concentration remains below cleanup levels will be required before the site can be granted a cleanup complete determination. Jonathan Schick
4/8/2011 Update or Other Action Contaminated Sites Staff submitted a letter to the USAF 611th CES project manager with comments on the Draft Supplemental Field Investitgation Report for several sites at Big Mountain. ADEC's main concerns were regarding the field screening samples at the upper camp sites where the field screening results were biased low. This low biascould lead to an underestimation of the amount of PCB impacted soils will need to be removed from the site. The other issue with this report is that it detailed only a portion of the work at LF005 and ST001 which was investigated during the same field mobilization but reported on under a separate Long-Term Monitoring report. Jonathan Schick
4/25/2011 Update or Other Action Contamintated Sites Staff recieved a copy of the Final Initial Screening of Alernatives for the four reaminaing active sites at the Big Mountain Radio Repeater Station. The comments submitted to the USAF were addressed in the Final version. Jonathan Schick
5/5/2011 CERCLA FS Contaminted Sites Staff recieved a copy of the Draft Feasibility Study for the 4 remaining active sites at Big Mountain including LF005, ST001, SS010a, and SS010b. Jonathan Schick
5/5/2011 CERCLA Proposed Plan Contaminated Sites Staff recieved a Draft version of the Proposed Plan for the 4 remaining active IRP sites at Big Mountian including LF005, ST001, SS010a, and SS010b. Jonathan Schick
5/17/2011 CERCLA FS Contaminated Sites Staff submitted a letter to the USAF regarding the Draft Feasibility Study for the remaining 4 sites at Big Mountain. The State's main concerns with the Draft FS was that benzene, DDT, and lead were left off the list of contaminants of concern. Additionally, the alternatives were rated incorrectly meaning that a moderate score was given to alternatives for the overall protectiveness of the environment, and compliance with ARARs. The two Threshold Criteria should only be scored as pass or fail. Moderately complying with ARARs is not an option in this process. Jonathan Schick
5/19/2011 Update or Other Action Contaminated Sites staff submitted a letter to the USAF approving the final version of the Initial Screening of Alternatives as all of our comments were addressed in the Final Version of the document. The Final version will be filed in our office. Jonathan Schick
6/10/2011 CERCLA Proposed Plan Contaminated Sites Staff submitted comments on the Proposed Plan for remedial work at Big Mountain to the Air Force remedial project manager. Comments were sent via email including a word version of the Proposed Plan with changes and numerous comments in an effort to make the plan more readable to the intended audience. Jonathan Schick
7/7/2011 CERCLA Proposed Plan Contaminated Sites Staff sent a letter to the Air Force approving the Proposed Plan to be presented at Public Meetings in the commmunities surrounding th Big Mountain Project site. Public meetins are scheduled to be conducted in villages surrounding the site over the 12th through the 14th of July. Jonathan Schick
7/13/2011 Site Visit Contaminated Sites Staff participated in a site visit and Public Meetings to present the Propsed Plan for Remedial Action at Big Mountain in the villages of Iliamna, Newhalen, and Igiugig. The main purpose of the site visit was to inspect the proposed location for a landfill that will contain the PCB soils that are to be excavated from three contaminated sites at Big Mountain. Jonathan Schick
7/14/2011 Update or Other Action Contaminated Sites Staff recieved a Draft Work Plan for Remedial Action at 4 sites at Big Mountain Radio Relay Station. The Work Plan details the excavation work planned at LF005, SS009, and SS010 for PCBs and sampling groundwater, surface water, and sediment for sites ST001, and LF005. This work is to be associated with the Draft Record of Decision for Remedial Action for the sites. Jonathan Schick
8/10/2011 Update or Other Action Contaminated Sites Staff submitted a letter to the US Air Force Remedial Project Manager with comments on the Draft Work Plan for remedial work scheduled to begin this summer at the Big Mountain Radio Relay Station. The work plan lacked the detail that ADEC requires for this type of remedial action and that detail was requested in the letter so that the work can be looked at after completion and compared to the plan to determine if the work was conducted correctly. The plan in its current state did not achieve this benchmark and was too vague for a field team to carry out the work. A comment resolution meeting will be held to discuss the necessary additions to the plan to make it usable in the field. Jonathan Schick
8/25/2011 Update or Other Action Contaminated Sites Staff sent a letter to the US Air Force Remedial Project Manager with comments on the Draft Record of Decision. The Record of Decision details the planned remedial activity at the site including the removal of PCB impacted soils from several sites, but also includes language for managing sediment contamination and long term management of the landfill at the lower camp. Jonathan Schick
8/29/2011 Update or Other Action Contaminated Sites Staff submitted a letter to the US Air FOrce approving the design document for the to-be consturcted landfill to hold PCB impacted soils excavated at the site. The design is for the area of Site ST014 which was an old Above Ground Storage Tank site which has a large earthen berm around the outside of the area to be filled with PCB soils. The soils that are located within the berm may be impacted with petroleum hydrocarbons and so they will stay within the boundaries of the site and used as backfill and cap material for the landfill. Jonathan Schick
8/29/2011 Meeting or Teleconference Held Contaminated Sites Staff and US Air Force representatives met to discuss the status of comments and responses on the Draft Final Record of Decision for the 4 remaining sites at Big Mountain that will require additional remedial work. The meeting was held to finalize any outstanding issues and agree on language to move forward with the document. The main issues that required resolution were the handling of the sediments at the lower camp sites and how they would be managed and what endpoint would be the remedial action objectives since natural attenuation does not work well for PCB impacts. Jonathan Schick
8/31/2011 CERCLA FS Contaminated Sites Staff recieved the Final Version of the Feasibility Study for the 4 remaining sites at Big Mountain Radio Relay Station. The Feasibility Study reviewed the various alternatives and determined that the preferred alternative for the PCB impacted sites was excavation and off-site disposal for soils impacted at concentrations greater than 10 parts per million and on-site disposal of the soils impacted between 1 and 10 parts per million. At the Lower camp long term monitoring was selected as the preferred remedy to monitor the contaminant levels in the groundwater adn sediment at the 2 remaining lower camp sites. Jonathan Schick
8/31/2011 Update or Other Action Conatminated Sites Staff recieved the Final Version of the Supplemental Field Investigation that augmented the previous Remedial Investigation to further delineate the extent of PCB impacted soils at several sites at Big Mountain Radio Relay Station. Jonathan Schick
9/8/2011 Site Characterization Workplan Approved Contaminated Sites Staff submitted a letter to the US Air Force approving the implementation of the work plan for PCB soil removal at several sites at the Big Mouinatin Installation. The plan details the excavation and segregation activities for PCB soil remediation where any soils impacted with over 10 parts per million of PCBs will be packaged and shipped off site for disposal and soils impacted between 1 and 10 parts per milion will be disposed of in an on-site monofill located at the upper camp. Jonathan Schick
9/9/2011 CERCLA ROD Approved The CERCLA Record of Decision for the 4 remaining sites at Big Mountain was signed and delivered to our office. The Record of Decision details the remaining remedial activities that will be completed at the lower and upper camps at the site mostly regarding the removal and disposl aof PCB impacted soils where any soils with PCBs in excess of 10 parts per million will be packaged and shipped off-site to a hazardous waste disposal landfill and the soils impacted between 1 and 10 parts per million will be buried in the newly constructed landfill located at the upper camp. Jonathan Schick
9/9/2011 Site Characterization Workplan Approved Contaminated Sites Staff recieved a Final version of the work plan for remedial action to be conducted at the Big Mountain Radio Relay Station. Additional details were added to aid in the execution of the work and the usability of the document. Most of the work detailed in the plan is regarding the excavatino and disposal of PCB impacted soils at several sites at Big Mountain. Jonathan Schick
5/22/2012 Update or Other Action Contaminated Sites Staff recieved a request for a waiver for the requirement for an impartial third party sampler for the ongoing project at Big Mountain. The request for a waiver for this requirement was granted for the project during the 2011 field season. Jonathan Schick
5/23/2012 Update or Other Action Contaminated Sites Staff responded to the request for the waiver for the third party sampler at Big Mounatain stating that we would like to see an interim report detailing the work that had been completed in 2011 and how the sampling program was implemented before granting the request again. Jonathan Schick
5/29/2012 Update or Other Action Contaminated Sites Staff recieved an interim report for the work completed at the active sites at Big Mountain in 2011. we reviewed the report and submitted comments and suggestions as to what type of information we were looking for in the report to support the third party waiver that was requested. Jonathan Schick
6/1/2012 Update or Other Action Contaminated Sites staff recieved an amended version of the interim report from the 2011 field activities. The report satisfied the State's requirement that the sampling and analysis program be summarized and the field activites were described in more detail. Jonathan Schick
6/1/2012 Update or Other Action Contaminated sites staff submitted a letter to the Air Force Project Manager approving the requested waiver for an independant third party sampler for the field program in 2012. Air Force personnel will collet and deliver the samples to an onsite laboratory for the analysis of PCBs. Jonathan Schick
9/30/2013 Report or Workplan Review - Other The ADEC Contaminated Site Program approved the 2013 Work Plan for Environmental Monitoring at Sites LF005, ST001, LF010 (SS014), Big Mountain Long RRS, Alaska. The scope of work for the project was to conduct long term monitoring of groundwater, surface water, and sediment; and to perform landfill inspections as part of the institutional controls for the installation. Jessica Morris
4/9/2014 Update or Other Action The ADEC Contaminated Sites Program approved the March 2014 Remedial Action Report, Environmental Restoration at SS010a and SS010b, LF005, and Monitoring Well Decommissioning at ST001, Big Mountain Radio Relay Station, Alaska. The report summarizes the excavation and disposal activities for PCB-impacted soil at LF005. Soil confirmation samples indicate that PCB concentrations in the soil remaining at the landfill are less than the ADEC cleanup level. Jessica Morris
7/25/2014 Report or Workplan Review - Other The ADEC Contaminated Site Program approved the 2014 Big Mountain Long Radio Relay Station, Environmental Monitoring Work Plan Addendum. Jessica Morris
11/5/2014 Institutional Control Record Established Institutional Controls established and entered into the database. Jessica Morris
11/6/2014 Cleanup Complete Determination Issued The ADEC Contaminated Sites Program submitted a letter to the USAF indicating that a cleanup complete with institutional controls determination was made for the site. Jessica Morris
4/10/2015 Report or Workplan Review - Other The ADEC Contaminated Site Program approved the 2014 Report for Environmental Monitoring at Sites LF005, ST001, LF010 (SS014), Big Mountain Long RRS, Alaska. Additional groundwater, surface water, and sediment monitoring was recommended at LF005 per the ROD. Jessica Morris
4/10/2015 Report or Workplan Review - Other The ADEC Contaminated Site Program approved the 2014 Report for Environmental Monitoring at Sites LF005, ST001, LF010 (SS014), Big Mountain Long RRS, Alaska. Additional groundwater, surface water, and sediment monitoring was recommended at LF005 per the ROD. Jessica Morris
11/5/2015 Report or Workplan Review - Other The ADEC Contaminated Site Program approved the 2015 Big Mountain Long Radio Relay Station, Environmental Monitoring Work Plan Addendum Jessica Morris
3/15/2016 CERCLA ROD Periodic Review The ADEC Contaminated Site Program approved the 2015 Big Mountain Long Radio Relay Station Five-Year Review Report for Sites SS002, LF002, and ST001. Jessica Morris
4/7/2016 Report or Workplan Review - Other The ADEC Contaminated Site Program approved the 2015 Report for Environmental Monitoring at Sites LF005, ST001, LF010 (SS014), Big Mountain Long RRS, Alaska. Additional groundwater, surface water, and sediment monitoring was recommended at LF005 per the ROD. Jessica Morris
8/15/2016 Report or Workplan Review - Other The ADEC Contaminated Site Program approved the 2016 Big Mountain Long Radio Relay Station, Environmental Monitoring Work Plan Addendum. Jessica Morris
3/10/2017 Report or Workplan Review - Other The ADEC Contaminated Site Program received the 2016 Draft Report of Environmental Monitoring for Sites LF010, LF005, and ST001 at Big Mountain Long Radio Relay Station. Linda (Qi) Liu
3/28/2017 Update or Other Action Former file number 2518.38.004 consolidated with 2518.38.001. Mitzi Read
5/5/2017 Report or Workplan Review - Other Response letter with comments on draft 2016 LTM report was sent out. Linda (Qi) Liu
5/25/2017 Meeting or Teleconference Held A comment resolution meeting was held on to resolve outstanding issues on the draft 2016 LTM report. Linda (Qi) Liu
6/21/2017 Report or Workplan Review - Other Final 2016 LTM report has been reviewed and approval letter with condition was mailed out. Linda (Qi) Liu
9/28/2017 Institutional Control Update ADEC received Air Force Statewide Land Use Control Management Plan dated Sept. 2017. The sites LF005, SS014 & ST001 were in place and being monitored on annually base. The site SS002 was accidently left out but Air Force agreed to conduct a IC status update in 2018 and add the site to 2018 LTM workplan. Linda (Qi) Liu
9/29/2017 Report or Workplan Review - Other ADEC received 2017 Long Term Monitoring Work Plan addendum that addressed the deviations from 2013 Work Plan along with additional debris inventory during 2017 field season. The scope of work for LTM at the Site, although different from proposed in 2013, has been documented in the reports and is still consistent with 2011 ROD. But ADEC recommended and AF agreed to collect samples (surface water and sediment at LF005 and sediment at ST001) at alternate locations since the historical samples have always been collected from selected locations and there might be data gap in between those locations. Since AF has intent to pursue closure or reduction of LTM frequency, it is better to check if those locations that hasn't been sampled in the past few years do and do not exhibit contamination. The Work Plan only covers sites LF005, ST001, SS014. SS002 will be added into 2018 work plan. Linda (Qi) Liu

Contaminant Information

Name Level Description Media Comments
PCBs - Total Other Sediment - Freshwater


Control Type

Type Details
Signed CS Determination


Requirements

Description Details
Periodic Review
Advance approval required to transport soil or groundwater off-site.