Site Report: Dutch Hbr-Unalaska Vly USTs 2762 AB
| Site Name: | Dutch Hbr-Unalaska Vly USTs 2762 AB |
|---|---|
| Address: | Choate Lane, UST UV-2762 A & B, Unalaska, AK 99685 |
| File Number: | 2542.38.023 |
| Hazard ID: | 2881 |
| Status: | Active |
| Staff: | Sarah Bernhardt, 9072697527 sarah.bernhardt@alaska.gov |
| Latitude: | 53.854722 |
| Longitude: | -166.502778 |
| Horizontal Datum: |
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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
Building 2762 was a two-story barracks on Choate Lane near the upper Broadway Avenue Bridge. Two heating oil tanks were present at the UV-2672 barracks. UV-2762A 300 gallons, UV-2762B 600 gallon. Both tanks were removed in 1997 with 60 cubic yards of soil removed from A and 40 cubic yards from B. In 2000, a 25 foot by 12 foot area was excavated to a depth of 8 feet below ground surface where groundwater was encountered. 50 cubic yards of contaminated soil was removed and backfilled with clean soil. Removal actions were hindered by the presence of an active electrical line and the foundation of the building. DRO remains up to 32,000 mg/kg and 400 mg/kg GRO. Update 11/2021 - Site is being prioritized under the Amaknak RAB along with several other UST sites in the Unalaska Valley.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 6/5/2000 | CERCLA RI Report Approved | The Comprehensive Remedial Investigation Report was received. This document discusses the field activities and results from 1996, 1997, 1998, and 1999. Activities included site investigations (SI), Interim Removal actions (IRA) and Remedial Investigations (RI). These various activities were performed at 56 sites throughout the entire Amaknak/Unalaska FUDS. Sampling was conducted to determine both site-specific as well as background levels of contaminants of concern. 93 USTs, 1 AST, associated piping, and 230 drums, contaminated liquid, sludge, and soil were removed during the IRA. Soil borings were drilled, monitoring wells installed and samples were taken to determine type and extent of contamination. Where appropriate a Method Three ACL was calculated. 31 sites are recommended for no further action (NFA) and 25 sites were recommended for further remedial action. DRO and GRO contamination remains at this site, and further action is necessary. The report recommends excavation, confirmation sampling, TOC and Method 3 calculations, and groundwater sampling to be compared to surface water standards. | Meghan Dooley |
| 1/23/2003 | Site Added to Database | Unalaska Valley expanded into a total of 26 unique sites from one. | John Halverson |
| 12/8/2003 | GIS Position Updated | TopoZone. | Debra Caillouet |
| 6/10/2005 | Update or Other Action | File number issued 2542.38.023. | Aggie Blandford |
| 6/26/2008 | Exposure Tracking Model Ranking | Initial ranking with ETM completed. | Daniel Fremgen |
| 9/14/2010 | CERCLA Proposed Plan | ADEC received the draft final Proposed Plan #7 addressing Unalaska Valley Management Area 11. The plan recommends Alternative 2 (Corrective Action Complete/Cleanup Complete with ICs) for UST 2762 A and B. Remaining DRO and GRO contamination is isolated near the building foundation. The source has been removed to the extent practicable. Remaining contamination may require further action if the building conditions change. | Meghan Dooley |
| 4/24/2023 | Document, Report, or Work plan Review - other | Bulk action entry for Unalaska Valley UST sites: on this date, DEC received and approved the Final Work Plan - CON/HTRW Limited Removal Action Unalaska Valley Amaknak FUDS - F10AK0841-13, Unalaska, Alaska Dated April 7, 2023. The fieldwork will consist of a combination of drilling, excavation, soil sampling, groundwater sampling, and surface water sampling, in addition to an optional task of drafting environmental covenants for select properties. | Cascade Galasso-Irish |
| 1/25/2024 | Document, Report, or Work plan Review - other | Bulk action entry for review of the Draft Restoration Summary Report Containerized Hazardous, Toxic, and Radioactive Waste, Amaknak Formerly Used Defense Sites, recommending closure at 53 sites. DEC received the draft summary report on April 2023, and provided comments on June 2023. On January 15, 2024, FUDS submitted a final summary report. Comment resolution has not been performed and is not complete. Further coordination is necessary with FUDS. | Cascade Galasso-Irish |
Contaminant Information
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Control Type
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Requirements
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No associated sites were found.