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Site Report: Dutch Hbr-Unalaska Vly UST 2664

Site Name: Dutch Hbr-Unalaska Vly UST 2664
Address: Broadway & Whittern Lane, UST 2664, Unalaska, AK 99685
File Number: 2542.38.023
Hazard ID: 2878
Status: Active
Staff: Kathleen Iler-Galau, 9074512153 kathleen.iler-galau@alaska.gov
Latitude: 53.863108
Longitude: -166.513291
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

Building 2664 was a former warehouse located at the intersection of Broadway and Whitten Lane. It is unknown when the warehouse was demolished (approximately mid - late 1980s), however the foundation is still present and the site is in use. In 1997, a 680 gallon heating oil UST and 290 cubic yards of impacted soil were removed. Confirmation sampling from the excavation indicated DRO remaining up to 8700 mg/kg DRO. Groundwater sampling of three wells in 1998 exhibited no exceedances of Table C cleanup levels. 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 sites, along with four other UST sites in Unalaska Valley.

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. Seven samples were collected at this site however no results exceede cleanup levels. Two monitoring wells were installed downgradient from USTs 2667 and 2664 to determine flow direction, and no analytical samples exceeded cleanup levels. 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. Additional groundwater monitoring is recommended for this site as well as implementation of institutional controls for soil removal. 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
6/18/2008 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 2664. Remaining DRO is confined to beneath the building foundation and does not appear to be migrating to groundwater or affecting the municipal monitoring well. DRO concentrations do not exceed the inhalation levels and the site does not pose an dunacceptable risk to human health or the environment. Residual contamination may require further action if the 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. DRO exceeds MTGW and ingestion CULs. Current site use is industrial (C&G LLC yard). As of the November RAB meeting, the recommended path forward at this site is sampling of the groundwater at two wells to gauge current site conditions and if institutional controls will be effective. 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
11/6/2024 Meeting or Teleconference Held The Qawalangin FUDS Restoration Advisory Board (RAB) Meeting was held at the Unalaska Public Library. This regional RAB incorporates five FUDS in the Qawalangin region: Amaknak FUDS, Chernofski FUDS, Cape Wislow FUDS, Fort Learnard FUDS, and Ugadaga Bay FUDS. RAB Board Members, USACE-FUDS, DEC, and members of the public were in attendance in-person, with additional stakeholders participating virtually. FUDS PMs provided updates on the status of FUDS sites. The RAB membership also updated their charter and added new members. Kathleen Iler-Galau
3/11/2025 Document, Report, or Work plan Review - other Today, DEC replied to comments on the CON/HTRW Limited Removal Action Report, which includes this site. Cleanup activities in 1997 excavated POL-contaminated soil on the Northeast side of the building foundation near the utility room, where the UST was removed. Samples from the base of the excavation had 8,700 mg/kg DRO. Three monitoring wells were installed in 1998 and 2000. Samples in 2000 were below cleanup levels. USACE seeks closure of this site. Kathleen Iler-Galau

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details

No associated sites were found.

Missing Location Data

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State of Alaska Department of Environmental Conservation

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