Site Report: Granite Mountain AFS AOC15
| Site Name: | Granite Mountain AFS AOC15 |
|---|---|
| Address: | ~30 Miles North of Koyuk, U.C. Disposal Area H, Koyuk, AK 99753 |
| File Number: | 610.38.001 |
| Hazard ID: | 817 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 65.432250 |
| Longitude: | -161.236083 |
| Horizontal Datum: | NAD83 |
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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
Former disposal and drum storage area; undocumented storage and disposal; stained soils observed. Also see file 610.15.002 and archived file 610.23.001. EPA ID #AK5570028659. In 1994, the site was surveyed by a metal detector, field screening, and soil sampling. The metal detector indicated that drums were not buried at the site. Soil samples were analyzed for VOCs, SCOVs, DRO, GRO, psticides/PCBs, metals, and mercury. During the 1999 RI two test pits were advanced to investigate surface staining. Samples tested for GRO, DRO, RRO, metals, pesticides, PCBs, VOCs, and SCOVs, and one sample was additionally analyzed for TOC. Results indicated the staining was likely a result of a surface spill; petroleum concentrations were below the health based cleanup levels applied to the site, but samples detected low levels of PCB contamination. During the 2009 removal action, approximately 4 cubic yards of stained soil were excavated from the site. Confirmation samples from the excavations did not detect PCBs above the cleanup level of 1 mg/kg. This site is closed under CERCLA and state regulations. No further remedial action is required and no institutional controls are necessary.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 6/15/2001 | Update or Other Action | 1999 RI Activities - Samples: 2 test pits excavated to maximum depth of 3 feet. 3 surface or subsurface soil samples collected. Analyses: Fixed lab: GRO, DRO, RRO, VOCs, SVOCs, pesticides, PCBs, metals, TOC, soil bulk density; CSL: DRO and RRO. Significant RI Findings - Concentrations of all detected chemicals were below ADEC cleanup standards with the exception of arsenic and PCB Aroclor 1260 in one surface soil sample at 1.4 mg/kg. Arsenic in two soil samples (5.9 and 6.0 mg/kg) exceeded ADEC cleanup standards, but concentrations are consistent with background levels. | 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 review and sent comments on 11 Decision Documents. It has been determined that there is no complete migration to groundwater pathway at the top camp. PCB contaminated soil and heavily stained RRO contaminated soil is to be excavated and shipped offsite for treatment. DRO contaminated soil will be remedied using landspreading technology on-site. | Patrice Buck |
| 12/16/2005 | GIS Position Updated | Verified 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 more details. | Colin Craven |
| 2/9/2007 | Exposure Tracking Model Ranking | Initial ranking. | Lisa Maserjian |
| 5/12/2009 | Document, Report, or Work plan Review - other | The final Engineering Evaluation and Cost analysis (EECA)was reviewed and approved. The EECA describes excavation and disposal of PCB contaminated soil with concentrations between 1 and 10 mg/kg at three sites SS003, OT01, and AOC15. The soil will be placed in an permitted onsite landfill. | Kim DeRuyter |
| 3/2/2010 | Exposure Tracking Model Ranking | A new updated ranking has been completed for source area 71796 AOC15. The ETM was updated based on the results of the 2009 Remedial Action report. Contaminated soil from AOC15 was segregated and either placed in the PCB cell, or treated onsite, and used as daily cover for the construction and debris landfill. Confirmation samples taken from the limits of the excavations did not detect contamination above the applicable cleanup level. All exposure pathways ranked as incomplete, de-minimis exposure or exposure controlled. | 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 | Cleanup Complete Determination Issued | 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 |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| PCBs - Total | < Method 2 Most Stringent | Soil | |
| RRO | < Method 2 Most Stringent | Soil |
Control Type
| Type | Details |
|---|---|
| No ICs Required |
Requirements
| Description | Details |
|---|---|
| Advance approval required to transport soil or groundwater off-site. |
No associated sites were found.