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Site Report: King Salmon AS GWZ 6 Rapids Camp Landfill

Site Name: King Salmon AS GWZ 6 Rapids Camp Landfill
Address: Rapids Camp Landfill, Groundwater Zone 6 (OT32), King Salmon, AK 99613
File Number: 2569.38.020.03
Hazard ID: 707
Status: Cleanup Complete - Institutional Controls
Staff: Sammi Castle,
Latitude: 58.640054
Longitude: -156.567611
Horizontal Datum:NAD83

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.


Rapids Camp was established as a recreational facility for troops stationed at the King Salmon Air Station (AS); waste oils, fuels and polychlorinated biphenyls (PCBs) were used and stored at the site. The King Salmon AS has been divided into seven Groundwater Zones for the purpose of site management. Rapids Camp is also referred to as Groundwater Zone 6 (OT032). Rapids Camp AS Landfill (LF003) is a former garbage landfill site within Rapids Camp/Zone 6 (OT032) used by the Air Force between 1952 and 1977. The landfill was capped and vegetated and groundwater monitoring well MW-15 was installed and monitored. A ROD for all of Rapids Camp/Zone 6 was signed in June of 2000. The selected remedy includes institutional controls (ICs), inspection and maintenance of the landfill cap and continued groundwater monitoring, with no further remedial action planned. ICs include no excavation or construction permitted within the boundary of the capped landfill (LF003) and no installation of drinking water wells within 100 feet of the boundary of the landfill. Zone-wide annual groundwater monitoring and base-wide Long Term Monitoring(LTM)of ICs were established. For additional information on groundwater monitoring and LTM at Rapids Camp including AS Landfill (LF003), see CS database entry: 2569.38.020 - King Salmon AS OT032 GW Zone 6, Hazard ID (ID): 2633.

Action Information

Action Date Action Description DEC Staff
6/15/1985 Preliminary Assessment Approved Installation Restoration Program Preliminary Assessment - Naknek Recreation Camps (dated April 1989). Preliminary Assessment performed to identify past spill or disposal sites that posed potential and actual hazards, or both, to public health or the environment. No Longer Assigned
6/15/1987 Update or Other Action Defense Environmental Restoration Account dated 1987. Field investigation performed to address debris material inventory, POL and hazardous material inventory, and disposal sites. No Longer Assigned
6/13/1988 Update or Other Action Hazardous Materials Technical Center Assessment: recommends that construction rubble, drums and barrels be removed from site#1 landfill. Install monitoring well system and soil sampling should be done with contaminated soil removed. Site#2 removal of all drums is recommended along with previous suggestions for monitoring/sampling. Site#3 soil sampling of stained area is suggested as well as disposal/removal. No Longer Assigned
6/15/1990 Site Ranked Using the AHRM Reconnaissance electromagnetic survey was conducted to search for buried drums, tanks, or other debris potentially buried on site, and to assist in choosing optimal drilling sites for soil borings and soil gas sample locations. The results of the soil gas survey were used to define areas of greatest potential environmental impact. No Longer Assigned
6/15/1991 Update or Other Action Partial site assessment performed to determine the presence or absence of contaminants reportedly released to subsurface at locations identified in the preliminary assessment. Louis Howard
6/15/1995 Site Characterization Report Approved Naknek Recreation Camps Remedial Investigation Report (final dated June 1995). Objective was to further define the extent of contamination in the subsurface. Two contamination sources were identified at Rapids Camp including the former generator pad and beach/dock area. Louis Howard
9/7/1995 Update or Other Action (Old R:Base Action Code = RDRA - Remedial Design / Remedial Action). RDRA action added by Shannon and Wilson, Inc., on 2/20/97, based on Relative Risk Evaluation Worksheet dated 9/7/95. S&W-Miner
1/10/1996 Update or Other Action Human Health and Ecological Risk Assessment Workplan for Naknek Recreation Camps (draft dated June 1995, received January 1996). Louis Howard
11/15/1996 Update or Other Action Aerial Photographic Analysis, King Salmon Airport Study Area. Prepared by EPA Region 10, Research and Development, Characterization, Research Division, TS-PIC-9710003S, dated November 1996. Gretchen Pikul
11/25/1996 Risk Assessment Report Approved Baseline Human Health and Preliminary Ecological Risk Assessment, Naknek Recreation Camps (final dated November 1996). Results indicated some remediation is required at both sites due to contaminant concentrations exceeding risk-based standards and the potential harm to wildlife from exposure to DRO, DDT, and heavy metals. Gretchen Pikul
12/3/1996 Update or Other Action Naknek Recreation Camps (Rapids Camp) Leaching Assessment (draft dated November 1996, received December 1996, no final report issued - report had many issues and Air Force did not produce a final report). Gretchen Pikul
2/20/1997 Site Added to Database Site added by Shannon and Wilson, Inc. Debris and drums of unknown contents. S&W-Miner
8/5/1997 Update or Other Action Management Action Plan report (draft dated December 1996, received March 1997, final dated June 1997, received August 1997). Gretchen Pikul
2/18/1998 Proposed Plan Rapids Camp Proposed Plan. Gretchen Pikul
3/25/1998 Update or Other Action Rapids Camp Modeling to Support Remedial Alternatives (draft dated March 5, 1998, no final report received). Gretchen Pikul
4/27/1998 Update or Other Action King Salmon, Naknek and South Naknek Native Villages Site Assessment Report (draft dated March 1998, received April 1998, no final received). Gretchen Pikul
9/4/1998 Update or Other Action King Salmon Residential Well Sampling, August 1997 Sampling Event, Analytical Results and Data Evaluation (dated March 1998, received September 1998). Gretchen Pikul
10/6/1998 Interim Removal Action Approved Rapids Camp workplan amendments for Interim Remedial Action (dated June 1998). Gretchen Pikul
12/3/1998 Update or Other Action Remedial Action Report, Rapids Camp, Volumes 1&2 (dated September 4, 1998, received December 1998). Gretchen Pikul
5/4/1999 Update or Other Action Feasibility Study, Installation Restoration Program, Naknek Recreation Camps (draft dated October 1995, final revised dated March 1997, draft dated March 1998, final dated April 1999, final insert pages received 1-18-00). Gretchen Pikul
10/14/1999 Site Ranked Using the AHRM Initial ranking. Gretchen Pikul
6/30/2000 Record of Decision Record of Decision for Final Remedial Action, Naknek Recreation Camp 1 (Rapids Camp/Site OT032) dated April 2000, signed by ADEC on April 11, 2000, and Air Force on June 30, 2000. The selected remedy for the site includes institutional controls (land use restrictions), inspection and maintenance of the landfill cap, and continued groundwater monitoring, with no further remedial action planned, as the final action for Rapids Camp. ICs have not yet been established. Gretchen Pikul
10/4/2000 Long Term Monitoring Established Annual groundwater monitoring will continue at the landfill site until the field and analytical data support the conclusion that contaminant levels remain below ADEC 18 AAC 75, Table C Groundwater Cleanup Levels. Monitoring may be discontinued after the five-year review and only with agency and community approval. Final Groundwater Zone 6 Work Plan received October 4. Gretchen Pikul
10/19/2001 Update or Other Action Groundwater Zones 4 and 6 Monitoring Report (draft dated April 6, 2001 and received on April 25, 2001; ADEC comment letter dated June 6, 2001). Gretchen Pikul
11/28/2001 Update or Other Action Work Plan - Inspection and Maintenance Activities for Groundwater Zone 4 and 6 Landfills - 2001 Monitoring Program (draft dated July 2, 2001 and received July 12, 2001; ADEC comment letter dated July 13, 2001; ADEC approval letter dated August 9, 2001; final dated November 28, 2001). Gretchen Pikul
1/25/2002 Site Ranked Using the AHRM Changed Observed Environmental Impacts value from 3 to 0 because an entry exists for Surface Water Environments. No Longer Assigned
1/31/2007 Update or Other Action File number issued 2569.38.020.03. Aggie Blandford
1/30/2009 Update or Other Action Well Decommissioning Report received detailing the decommissioning of several wells at the sites in the Rapids Camp area. Landfill groundwater monitoring well MW-15 was decommissioned because the contaminant levels in the groundwater had reached the applicable Remedial Action Objective. The well was removed from the ground and the annulus filled with bentonite chips, in addition to other material. There were no comments submitted on this report. Jonathan Schick
7/1/2015 Update or Other Action Final Land Use Control Management Plan – Pacific Air Forces Regional Support Center Installations published which includes the following land use controls at the Rapids Camp AS Landfill: no excavation or construction is permitted within the boundary of the capped landfill (LF003), and no installation of drinking water wells within 100 feet of the boundary of LF003 within OT032. Holly Weiss-Racine
5/3/2016 Cleanup Complete Determination Issued A Cleanup Complete Determination for Groundwater Zone 6 and associated sites at King Salmon Divert was issued on May 3, 2016. This includes a Cleanup Complete with Institutional Controls (ICs) determination for 2569.38.020.03 - King Salmon AS Rapids Camp Landfill (LF003 Landfill), Hazard ID: 707. Long Term Monitoring of ICs at the landfill will continue. Holly Weiss-Racine
5/5/2016 Institutional Control Record Established Institutional Controls established and entered into the database. Holly Weiss-Racine
10/3/2018 Report or Workplan Review - Other ADEC approved the Final 2017 Long Term Management Report for the King Salmon Divert on this date. Zone 1 recommendations include continuation of monitoring with no changes. Petroleum hydrocarbons and TCE were detected above cleanup levels in groundwater in Zone 2; recommendations include continued monitoring and updating cleanup levels in next 5 Year Review. In Zone 3, low levels of TCE and benzene were detected in the March 2018 SBTS sample, and gabions in King Salmon Creek are being pulled out of alignment; recommendations include reducing sampling at the North and South Bluffs to once every five years. In Zone 4, petroleum hydrocarbons were detected above cleanup levels in the A-aquifer but below cleanup levels in the B-aquifer; recommended that monitoring should continue due to drinking water wells and other sensitive receptors lying downgradient of this site. Monitoring will continue in Zone 5 without changes. Inspections of the Rapids Camp and Landfill were conducted in Zone 6; there were no observations of noncompliance at the landfill. Two of eight wells in Zone 7 exceeded RAO for DRO; 2015 soil samples from three LF01 locations indicated DRO contaminated soil above cleanup levels - this should be excavated and treated. Sammi Castle

Contaminant Information

Name Level Description Media Comments
DRO > Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
Land Use Plan / Maps / Base Master Plan ICs are required to be posted in Base General Plan; however, ICs were not included in the 2005 version of this document.
Land Use Plan / Maps / Base Master Plan ICs (Land Use Restrictions) are presented in the U.S. Air Force Land Use Control Plan 2015.


Description Details
Excavation / Soil Movement Restrictions Restricts soil excavation within 100 feet of the landfill. Five-Year Review
Groundwater Use Restrictions Restricts groundwater well installation within 100 feet of the landfill. Five-Year Review
Advance approval required to transport soil or groundwater off-site.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70)

Missing Location Data

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