Site Report: Dutch Hbr-Unalaska Vly UST 2060
| Site Name: | Dutch Hbr-Unalaska Vly UST 2060 |
|---|---|
| Address: | Unalaska Valley, UST 2060 Old Mess Hall, Unalaska, AK 99685 |
| File Number: | 2542.38.023 |
| Hazard ID: | 2877 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 53.870088 |
| Longitude: | -166.518370 |
| 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. A 300 gallon heating oil UST was removed along with 880 cubic yards of impacted soil in 1998. Confirmation sampling indicated DRO remaining at 670 mg/kg. 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.
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. Sixteen soil samples were collected from the project area and stockpile. Two samples exceeded DRO cleanup levels with concentrations of 360 and 670 ppm. NFA is recommended at this site as further excavation may impact the gravel road and small pond nearby. | 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 source has been removed as well as 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 |
| 6/13/2003 | CERCLA SI | The 2001/2002 Islandwide SI/RI/IRA Report was received. The report documents the work completed during the 2001 and 2002 field seasons at various sites throughout Amaknak and Unalaska. Sediment samples were collected in 2002 along the trench lining at the site to determine if contamination was still present and migrating off site. Sheen was observed on the water surface, however no odor was detected. The site is recommended for no further action becuase no cleanup levels exist for DRO in the sediment and the downgradient sample was less than the 95% UCL calculated for the site. | Meghan Dooley |
| 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 1 (Corrective Action Complete/Cleanup Complete with NDAI) for UST 2060. Remaining contamination is minimal, near the building foundation, and less than the calculated Method 3 ACLs. | Meghan Dooley |
| 9/12/2019 | Update or Other Action | Site location was updated on this date. Coordinates for this site are used to determine the presence and position of the site on BLM’s ANCSA Conveyed Land web map. | Rebekah Reams |
| 11/3/2023 | Cleanup Complete Determination Issued | On this date, DEC issued a Cleanup Complete Determination for the site. Based on the information provided to date, it has been determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment, and no further remedial action will be required unless information becomes available that indicates residual contaminants may pose an unacceptable risk. | Cascade Galasso-Irish |
| 2/22/2024 | Document, Report, or Work plan Review - other | On this date, DEC reviewed and approved the redline final, RTCs, and final Restoration Summary Report for the Amaknak Formerly Used Defense Sites F10AK0841-13, -14, -15, -16, -18, -20, Unalaska Valley, Pyramid Valley-Port Levashef, Summer Bay-Humpy Cove, Margaret Bay-Airport, Mount Ballyhoo, and Little South America in Unalaska, Alaska. Of the 53 sites included in this report, 39 of these sites are either closed in the Contaminated Sites database or are not eligible active sites. Fourteen (14) sites remain open in the CS database, either pending further coordination on the pathway to closure or are currently with DEC management for closure decision. This letter is documenting the approval of the final document but does not preclude the need for further investigation of sites included in the report. | Cascade Galasso-Irish |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | Other | Soil | DRO contamination remains in soil remain at a maximum concentration of 870 mg/kg, below the calculated most stringent ACL for ingestion at 7,500 mg/kg based on a site-specific FOC of 0.034 g/g. |
Control Type
| Type | Details |
|---|---|
| No ICs Required |
Requirements
| Description | Details |
|---|---|
| Advance approval required to transport soil or groundwater off-site. | |
| Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70) |
No associated sites were found.