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Site Report: Granite Mountain AFS LF02

Site Name: Granite Mountain AFS LF02
Address: ~30 Miles North of Koyuk, U.C. Solid Waste Disposal, Koyuk, AK 99753
File Number: 610.38.001
Hazard ID: 820
Status: Cleanup Complete - Institutional Controls
Staff: Dennis Shepard, 9074512180 dennis.shepard@alaska.gov
Latitude: 65.428000
Longitude: -161.234700
Horizontal Datum:WGS84

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

Permitted landfill. Also see file 610.15.002 and archived file 610.23.001. EPA ID #AK5570028659. The 1994 PA/SI identified DRO to 2,260, RRO to 78,800 ppm, lead to 190 ppm and arsenic to 56 ppm in a surface soil stain. The site was further characterized in 1999. 4 test pits were placed in locations that would not disturb buried materials and samples were taken. A sample was taken from the same soil area identified in 1994. In 2008, activity involved revisiting select sites to fill data gaps, and specifically to compare RCRA metals levels to background levels and Action Level. Arsenic (31mg/kg) and Chromium (29.9mg/kg) exceeded Action Level, and Lead (46.7mg/kg) exceeded the background level but not the action level. Background levels are approximations based on prior USGS surveying. A remedial action conducted in 2009 removed approximately 80 cubic yards of contaminated soil from LF002. Confirmation samples at the limits of the excavation did not detect contamination above the applicable clean up levels. The excavated soil was landspread at upper camp and when analytical results indicated that contaminant concentrations were below the health based cleanup levels, the excavated soil was used as cover in the construction and debris landfill. This site is closed under CERCLA and state regulations. No further remedial action is required but, because buried debris remains on-site and may contain hazardous substances, institutional controls will be applied. The institutional controls are to restrict excavation, disturbance or movement of buried solid waste and documenting the location and restrictions in land use records.

Action Information

Action Date Action Description DEC Staff
6/15/1999 Update or Other Action 1999 RI Activities - Samples: 4 test pits excavated to maximum depth of 4.5 feet. 4 surface and subsurface soil samples collected. 1 monitoring well installed and sampled. 1 surface water sample collected. 3 sediment samples collected. Analyses: Fixed lab: GRO, DRO, RRO, VOCs, SVOCs, pesticides, PCBs, metals, TOC, bulk density; CSL: DRO and RRO. Significant RI Findings - Heavily stained soils were observed near the center of the site. At this location, concentrations of RRO (up to 25,000 mg/kg) exceeded ADEC cleanup standards to a depth of 2 feet within the stained area. The full vertical extent of contamination was not defined. Lead concentration in subsurface soil at TP01 (985 mg/kg) exceeded ADEC cleanup standard. Concentrations of arsenic (7.4 to 39.9 mg/kg) were above ADEC cleanup standard but are consistent with regional background soils data. Former Staff
12/26/2001 Site Added to Database RRO. Former Staff
12/26/2001 Site Ranked Using the AHRM Initial ranking. Former Staff
2/26/2002 Update or Other Action Staff commented on Granite Mountain RRS, Draft Decision Documents. Action entered by Sarah Riddle. Patrice Buck
12/16/2005 GIS Position Updated Updated the site location data. Colin Craven
1/10/2006 Meeting or Teleconference Held DEC meeting with Air Force project manager. See the sitewide "Granite Mountain AFS" database entry for details. Colin Craven
2/23/2007 Exposure Tracking Model Ranking Initial ranking. Lisa Maserjian
12/30/2008 Document, Report, or Work plan Review - other The SRI further delineated the stained soil and lead contmaination previously described in the 1999 RI (2001 RI Report). Three samples surrounding the previous lead detection, contained 22 to 70 mg/kg lead. Five test pits detected RRO from 90 to 8,560 mg/kg, the highest concentration was detected at 3 feet below ground surface. Kim DeRuyter
3/2/2010 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 71799 LF02. The ETM was updated based on the results of the 2009 Remedial Action Report. The facility was demolished and contaminated soil was excavated and treated onsite, then used as daily cover in the permitted construction and debris monofill. Confirmation samples taken from the limits of the excavations did not detect contamination above the applicable cleanup level. All exposure pathways ranked as incomplete, exposure controled, or de-minimis exposure. Kim DeRuyter
1/19/2011 Update or Other Action The CERCLA ROD and Petroleum DD were submitted to the department. Staff provided comments on several versions of the documents. Initially, petroleum contamination at sites with CERCLA contaminants were covered in the ROD. The structure of the CERCLA ROD did not allow for adequate coverage of the petroleum at these sites. Since the petroleum and CERCLA contaminants were not co-located it was decided that the petroleum cleanups at the CERCLA contaminated sites could be covered in the Petroleum Decision Document. Staff provided comments on the draft and draft final versions of these restructured documents. The ROD and Decision Document are currently being prepared for signature. Kim DeRuyter
2/10/2011 CERCLA ROD Approved ROD and Decision Document signed by the department and the Air Force. The selected remedy for this site is No Further Action. Kim DeRuyter
2/10/2011 Institutional Control Record Established This site is closed under CERCLA and state regulations. No further remedial action is required but, because buried debris remains on-site and may contain hazardous substances, institutional controls will be applied. The institutional controls are to restrict excavation, disturbance or movement of buried solid waste and documenting the location and restrictions in land use records. Kim DeRuyter
6/10/2014 Update or Other Action Alaska Department of Natural Resources was added as Landowner of site. U.S. Air Force Elmendorf remains responsible party. Anna Iverson
7/22/2014 Cleanup Complete Determination Issued The Granite Mountain Decision Document applies institutional controls to this site, restricting excavation or movement of solid waste. ICs are documented in the 611th CES Land Use Control Management Plan. The Decision Document was approved by DEC on January 10, 2011. LF002 is also included in the CERCLA Record of Decision for Granite Mountain. Under CERCLA, the selected remedy for LF002 was No Further Action. Eric Breitenberger
5/18/2023 Document, Report, or Work plan Review - other DEC provided comments for the Draft Final Work Plan, Long Term Management at Granite Mountain Radio Relay Station, Alaska Dated May 2023. The Work Plan presents the approach and procedures for long-term management (LTM) at the Granite Mountain Radio Relay Station. The purpose of the LTM project is to conduct institutional control (IC) inspections, a landfill cover inspection at Site OT001, and sign maintenance, as needed, for the following sites to maintain compliance with U.S. Air Force (USAF) and regulatory requirements: DA020, DA021, DP009, DP010, LF002, OT001, SS016, SS017 and SS019. Dennis Shepard
8/15/2023 Document, Report, or Work plan Review - other DEC provided approval for the Final Work Plan, Long Term Management at Granite Mountain Radio Relay Station, Alaska Dated June 2023. The work plan presents the approach and procedures for long-term management (LTM) at the Granite Mountain Radio Relay Station. The purpose of this LTM project is to conduct institutional control (IC) inspections, a landfill cover inspection at Site OT001, and sign maintenance, as needed, for the following sites to maintain compliance with U.S. Air Force (USAF) and regulatory requirements: DA020, DA021, DP009, DP010, LF002, OT001, SS016, SS017 and SS019. Dennis Shepard
3/15/2024 Long Term Monitoring Workplan or Report Review DEC provided comments for the 2023 Long-Term Management Report Granite Mountain Radio Relay Station Sites DA020, DA021, DP009, LF002, OT001, SS016, SS017, and SS019 (dated February 2024). Visual inspections were conducted at the Lower Camp Area sites (DA021 and DP010) on July 5, 2023 and at Upper Camp Area sites (DA020, DP009, LF002, OT001, SS016, SS017, and SS019) on September 16, 2023. Landfill caps and other surface coverings were found to be in good condition. Institutional Control (IC) signage was inspected and signs were repaired and/or replaced as needed with the exception of site DA021 which was recommended for repairs at the next LTM inspection in 2028. Brian Watts
7/5/2024 Long Term Monitoring Workplan or Report Review DEC provided responses to comments for the 2023 Long-Term Management Report Granite Mountain Radio Relay Station Sites DA020, DA021, DP009, LF002, OT001, SS016, SS017, and SS019 (dated May 2024). The report describes long-term management activities completed July 5 and September 16, 2023. All comments were accepted, pending a final comment backcheck to the requested final report. Brian Watts
8/20/2024 Long Term Monitoring Workplan or Report Review DEC provided approval for the Final 2023 Long-Term Management Report Granite Mountain Radio Relay Station Sites DA020, DA021, DP009, LF002, OT001, SS016, SS017, and SS019 (dated August 2024) to the U.S. Air Force. Activities consisted of a visual inspection, sign repair or replacement, and photo documentation of each site. The only institutional control/land-use control recommendation was to install an institutional control sign at DA021 during the long-term monitoring work planned for 2028. Erica Blake

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details
Institutional Control Management Plan Included in 611th CES LUC Management Plan.

Requirements

Description Details
Excavation / Soil Movement Restrictions Restrictions on excavation or disturbance of buried solid waste to prevent the release of potential contamination or placement of solid waste in environmentally sensitive areas. Restrictions on movement of buried solid waste without prior ADEC approval.
Advance approval required to transport soil or groundwater off-site.

There are no documents for this site report.

No associated sites were found.

Missing Location Data

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
TDD: 800-770-8973
Physical Location: 410 Willoughby