Division of Spill Prevention and Response

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Site Report: King Salmon AS GWZ 6 Rapids Camp Septic


Site Name: King Salmon AS GWZ 6 Rapids Camp Septic
Address: Groundwater Zone 6 (OT32), aka ST01 Septic Tank, King Salmon, AK 99613
File Number: 2569.38.020.04
Hazard ID: 706
Status: Cleanup Complete - Institutional Controls
Staff: Linda (Qi) Liu, linda.liu@alaska.gov
Latitude: 58.727602
Longitude: -157.015936
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.


Problems/Comments

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 Camp Generator Pad (SS004) is a former generator pad within Rapids Camp/Zone 6 (OT032) used by the Air Force between 1952 and 1977. During Generator Pad remediation in 1991, Septic Tank (ST001) was discovered. No evidence of contamination was associated with the tank, however, the septic system falls within the contaminated generator pad area. Therefore, the septic tank area and the generator pad area have been treated as one. Please see the CS Database entry: 2569.38.020.02 -King Salmon AS Rapids Camp Gen Pad (SS004 Generator Pad), Hazard ID: 701 for additional information on contamination at the septic tank/generator pad area. A ROD for all of Rapids Camp/Zone 6 was signed in June of 2000. The selected remedy includes land use restriction institutional controls (ICs) and continued groundwater monitoring, with no further remedial action planned. ICs include no excavation of soils deeper than 5-feet bgs within the boundary of the former generator pad (SS004) or the former septic tanks (ST001) and no installation of drinking water wells within 100 feet of the boundary of the two sites. 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 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 Update or Other Action 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). The objective was to further define the extent of contamination in the subsurface. The generator pad/septic system area was identified as a source of contamination. Louis Howard
9/6/1995 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 9/6/95. 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
2/21/1997 Site Added to Database Site added by Shannon and Wilson, Inc. Potential petroleum hydrocarbons, waste oil, and metals contamination from discharge of connected piping. S&W-Miner
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
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
5/26/1999 Update or Other Action Intrinsic Remediation Study, King Salmon Airport, Groundwater Zone 6 (draft dated May 1999; no final produced). 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. Gretchen Pikul
1/31/2007 Update or Other Action File number issued 2569.38.020.04. 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. Septic tank and generator pad groundwater monitoring wells MW-11 and MW-16 were decommissioned because the contaminant levels in the groundwater had reached the applicable Remedial Action Objective. The wells were removed from the ground and the annulus filled with bentonite chips, in addition to other material. There were no comments submitted on this report. Holly Weiss-Racine
7/1/2015 Update or Other Action Final Land Use Control Management Plan – Pacific Air Forces Regional Support Center Installations is published which includes the following land use controls at the Rapids Camp Septic Tank/Generator Pad area: no excavation of soils deeper than 5-feet bgs within the boundary of the former generator pad (SS004) or the former septic tanks (ST001) and no installation of drinking water wells within 100 feet of the boundary of the generator pad. 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 2569.38.020.04 - King Salmon AS Rapids Camp Septic (WP002 Septic Tanks/ST001), Hazard ID: 706. Long Term Monitoring of ICs will continue. Holly Weiss-Racine

Contaminant Information

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


Control Type

Type Details
Land Use Plan / Maps / Base Master Plan Land Use Restrictions are presented in the U.S. Air Force Land Use Control Plan 2015.


Requirements

Description Details
Excavation / Soil Movement Restrictions Restricts soil excavation within 100 feet of the generator pad. Former septic tank is encompassed within this area. Five-Year Review
Groundwater Use Restrictions Restricts groundwater well installation within 100 feet of the generator pad. Former septic tank is encompassed within this area. 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)

There are no documents for this site report.