Site Report: Granite Mountain AFS SS004
| Site Name: | Granite Mountain AFS SS004 |
|---|---|
| Address: | ~30 Miles North of Koyuk, U.C. Vehicle Maint. Bldg., Koyuk, AK 99753 |
| File Number: | 610.38.001 |
| Hazard ID: | 822 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 65.432194 |
| Longitude: | -161.236111 |
| 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
Shop wastes potentially discharged to floor drain, diesel day tank, and possible backdoor dumping may have caused contamination. Formerly AOC05. Also see file 610.15.002 and archived file 610.23.001. EPA ID #AK5570028659. Potential Institutional Control Established site due to contamination potentially extending under a building. The site was sampled during investigations in 1994, 1999, and 2008, cumulatively identifying approximately 3 cubic yards of soil with DRO concentration in excess of 10,250 mg/kg. Highest sample concentrations were 17,000 mg/kg DRO and 14,800 mg/kg RRO. The building was emptied of all debris and inspected for the presence of a floor drain during the 2009 remedial action. No floor drain was found. The contaminated soil was treated by landspreading onsite. When sample results indicated that the 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 and no institutional controls are necessary.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 6/15/1999 | Update or Other Action | 1999 RI Activities - Samples: 2 test pits excavated to maximum depth of 4 feet.; 3 subsurface soil samples collected from test pits. 57 surface soil samples collected for CSL analyses. Analyses: Fixed lab: GRO, DRO, RRO, VOCs, SVOCs, pesticides, PCBs, metals; CSL: DRO and RRO. Significant RI Findings - Soils in the vicinity of the day tank exceeded ADEC cleanup standards for DRO (up to 14,500 mg/kg) and RRO (up to 14,800 mg/kg). Contaminants were found to depths of 2 feet and potentially extend under building. | Former Staff |
| 12/26/2001 | Site Added to Database | RRO and DRO. | 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 | 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 details. | Colin Craven |
| 2/23/2007 | Exposure Tracking Model Ranking | Initial | Lisa Maserjian |
| 12/30/2008 | Document, Report, or Work plan Review - other | Seven test pits were dug beyond the limits of the area previously investigated to determine if petroleum contamination from the former day tank was the source of contamination in the shallow perched water table at AOC02 downgradient of this site. DRO was detected up to 1,080 mg/kg, but groundwater was not encountered, and the lack of significant soil contamination between the day tank and the down gradient site makes this scenario unlikely. Soil Contamination remains near the and diesel AST DRO (up to 14,500 mg/kg) and RRO (up to 14,800 mg/kg) according to the 1999 RI. | Kim DeRuyter |
| 3/2/2010 | Exposure Tracking Model Ranking | A new updated ranking has been completed for source area 71801 SS004. The ETM was updated based on the results of the 2009 Remedial Action Report. The building was demolished and contaminated soil was excavated and treated onsite, then used as daily cover in the permitted construction and debris monoflll. Confirmation samples taken from the limits of the excavations did not detect contamination above the applicable cleanup level. All exposure pathways ranked as incomplete 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 | The selected remedy for this site is No Further Action. | Kim DeRuyter |
| 2/10/2011 | Cleanup Complete Determination Issued | Kim DeRuyter |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | < 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.