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Site Report: Dutch Hbr-Unalaska Vly UST 3260

Site Name: Dutch Hbr-Unalaska Vly UST 3260
Address: Northern Ski Bowl Road, UST 3260, Unalaska, AK 99685
File Number: 2542.38.023
Hazard ID: 2890
Status: Active
Staff: Kathleen Iler-Galau, 9074512153 kathleen.iler-galau@alaska.gov
Latitude: 53.868889
Longitude: -166.498611
Horizontal Datum:

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 3260 was a former mess hall located in the northern valley of the Ski Bowl area. UST 3260 is believed to have been a 300 gallon heating oil UST for the former mess hall building 3260. In 1997, an 88 square foot area was excavated and the tank was removed. Confirmation sampling indicated DRO remained in soil up to 11,000 mg/kg. Update 11/2021 - Site is being prioritized under the Amaknak Restoration Advisory Board, along with several other UST sites in the Amaknak Valley. Site is a candidate for FUDs soil removal and resampling.

Action Information

Action Date Action Description DEC Staff
6/5/2000 Site Characterization Report Approved ADEC received a Comprehensive Remedial Investigation Report, dated May 2000 and prepared by Jacobs Engineering. It documents the ~ 300 gal. UST was removed in Sept. 1997. Due to site access issues no soil was removed from the site, soil excavated to remove the tank was used as backfill on-site. Field screening and observations indicate a release ocurred. Two test pits were installed to screen for downgradient impacts, none were evident. Confirmation samples collected from the initial excavation contained DRO up to 11,000 mg/kg, RRO up to 1,300 mg/kg, and low level BTEX and PAHs (below cleanup levels). The report recommends further work including evaluating additional soil removal and conducting groundwater and surface water monitoring. John Halverson
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
7/9/2008 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 3260. Excavation of remaining contamination is impractical due to very shallow groundwater and potential release into surface waters, therefore as an IC residual contamination will be documented to assist in future land management planning. Meghan Dooley
2/4/2011 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 73866 name: UST Bianca Reece
11/9/2021 Update or Other Action Site is being prioritized under the Amaknak Restoration Advisory Board, along with several other UST sites in the Amaknak Valley. Site is a candidate for FUDs soil removal, resampling, and groundwater monitoring. 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
7/17/2023 Document, Report, or Work plan Review - other DEC received a work plan addendum for the Amaknak FUDS Unalaska Valley work plan, regarding two requested deviations to the work plan. These deviations were for USTs 3065 and 3260, and included: 1. the incorporation of silica gel cleanup methods to limit biogenic interference in the laboratory analytical results 2. the use of an excavator to install monitoring wells within the source areas during excavation/backfill activities. DEC reviewed and approved the work plan addendum on July 17, 2023. 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

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details

No associated sites were found.

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
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