Site Report: Dutch Hbr-Unalaska Vly UST 2667
| Site Name: | Dutch Hbr-Unalaska Vly UST 2667 |
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| Address: | 1037 E Broadway Avenue, UST 2667 New DPW Building, Unalaska, AK 99685 |
| File Number: | 2542.38.023 |
| Hazard ID: | 2876 |
| Status: | Active |
| Staff: | Kathleen Iler-Galau, 9074512153 kathleen.iler-galau@alaska.gov |
| Latitude: | 53.863390 |
| Longitude: | -166.511889 |
| Horizontal Datum: | WGS84 |
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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
Diesel fuel contamination from abandoned underground fuel storage tanks, most related to heating fuel. The 1000 gallon heating oil tank was removed along with 160 cubic yards of impacted soil in 1998. Confirmation sampling indicated up to 6600 mg/kg DRO remaining. Amaknak and Unalaska Islands were used by the military during World War II. The Japanese bombed Dutch Harbor and Fort Mears in 1941. Following the bombing the military dispersed its troops moving back up into Unalaska Valley and Pyramid Valley to minimize the potential for damage if future air raids occurred. The Corps of Engineers had a contractor tear down the abandoned buildings and debris and dispose of them in various landfills during the mid - late 1980s. Underground fuel tanks were abandoned in place. In the mid-1990s the Corps started working on the sites again under the Formerly Used Defense Sites (FUDS) program. Site inspections were done around the former buildings to look for remaining underground fuel tanks and other potential contaminant sources. This site has been prioritized by the Amaknak Restoration Advisory Board Committee for FUDS site, along with four other UST sites in Unalaska Valley. Site is capped by the Department of Public Works building. FUDs is seeking institutional controls and an environmental covenant for the site due to the soil remaining above MTG cleanup levels.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 8/25/1999 | Site Characterization Report Approved | ADEC received the final report titled "1998 SI, RI, IRA Amaknak and Unalaska Islands" dated August 1999, by Jacobs Engineering. The tank, tank contents, and contaminated soil were removed from the site. Confirmation samples were taken and the excavation was partially backfilled. Bedrock and groundwater were encountered at 7 feet bgs. DRO was sampled at 12,000 ppm before excavation. Aresenic was present at concentrations above cleanup levels but below background. 1,4 dichlorobenzene was detected exceeding cleanup levels, but because soil was excavated to bedrock and new construction of a DPW building has occurred, no further action is recommended for this site. | Meghan Dooley |
| 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. NFA is recommended for this site as the UST has been removed along with POL impacted soil. | Meghan Dooley |
| 1/23/2003 | Site Added to Database | Unalaska Valley expanded into a total of 26 unique sites from one. | John Halverson |
| 12/1/2003 | GIS Position Updated | Montana | Debra Caillouet |
| 6/10/2005 | Update or Other Action | File number issued 2542.38.023. | Aggie Blandford |
| 6/17/2008 | Exposure Tracking Model Ranking | Initial ranking with ETM completed. | Jill Taylor |
| 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 2667. Remaining DRO was excavated to fractured bedrock and is capped by the DPW building. The source has been removed to the extent practicable and remaining concentrations do not exeed the ingestion or inhalation cleanup levels. Remaining contamination may require action if building conditions change. | Meghan Dooley |
| 11/9/2021 | Update or Other Action | Site is being prioritized in the Amaknak Restoration Advisory Board, along with several other UST sites in Unalaska Valley. As of the November RAB meeting, FUDs PM will be working with the City Manager to develop an environmental covenant to place institutional controls at the site. DRO exceeds migration to groundwater soil cleanup levels and is capped by the Department of Public Works. | Cascade Galasso-Irish |
| 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.