Site Report: Dutch Hbr-Unalaska Vly UST 2674
| Site Name: | Dutch Hbr-Unalaska Vly UST 2674 |
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| Address: | 1,200 Ft NW of Broadway Avenue and 165th Road, Unalaska, AK 99685 |
| File Number: | 2542.38.023 |
| Hazard ID: | 25812 |
| Status: | Active |
| Staff: | Kathleen Iler-Galau, 9074512153 kathleen.iler-galau@alaska.gov |
| Latitude: | 53.859263 |
| Longitude: | -166.506547 |
| 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
Building 2674 was a warehouse located on Broadway Avenue approximately 1,200 feet northwest of its intersection with 165th Road. Only the foundation remains. The former UST and piping located at the site, used to store heating oil for the building 2674 heating system, was discovered in 1997 northwest of the building foundation. 130 cubic yards of impacted soil was removed and soil samples were collected. One sample contained DRO at a concentration of 1,700 mg/kg. In 2000, 35 cy of soil surrounding the foundation was excavated, including the location of the 1997 exceedance. The excavation encountered bedrock at 4 feet bgs, and landowner did not want foundation removed for further excavation. Confirmation soil samples collected at bedrock contained DRO in exceedance of the ADEC Method Two cleanup criterion, with concentrations of 309 and 649 mg/kg. Groundwater was not encountered. The area was backfilled with clean material and 4 tons of new gravel was used to cover the excavation. Phase I and Phase II Site Investigations occurred in 2015 and 2016. Two test pits were advanced to verify prior detections of DRO and determine lateral extent of contamination. Both pit were advanced to bedrock at 2-3 feet. No groundwater was encountered. Two laboratory samples were collected and were below ADEC Method Two cleanup criteria. Highest concentration of DRO was 18.6 mg/kg, and RRO 698 mg/kg. Update 11/2021 - This site has been prioritized by the Amaknak Restoration Advisory Board Committee for FUDS site, along with four other UST sites in Unalaska Valley. Current landowner is building a structure to house equipment related to fuel storage and site is located 400 feet from municipal well.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 2/6/2012 | Site Added to Database | A new site has been added to the database | Mitzi Read |
| 6/5/2015 | Update or Other Action | Received a draft document titled: Dutch Harbor Limited Removal Action Work Plan, Amaknak and Unalaska Islands, Alaska. The work plan outlines the activities planned to investigate twelve formerly used defense sites (FUDS) on the two islands and remove contaminated soil as necessary. The field activities will be carried out in two phases: Phase I is the investigation and will be conducted during the summer of 2015; Phase II is the removal action which will be carried out in the summer of 2016. ADEC File Number 2542.38.009 will be used to track this project, and all paper and electronic files will be housed under this file number. Updates to this data base will be made to each individual site, which can be accessed by its individual file number or by its (Hazard ID) number. The sites are: 2542.38.014 (25716) Mount Ballyhoo Drums; 2542.38.017 (25722) Pyramid Valley USTs (Bldg. 5264); 2542.38.018 (25704) Rocky Point Bldg. 627; 2542.38.023 (25812) Unalaska Valley UST 2674; 2542.38.023 (2882) Unalaska Valley UST 2766; 2542.38.023 (25804) Unalaska Valley Ski Bowl Generator Bldg.; 2542.38.023 (25811) Upper Unalaska Valley 165th Rd. and Ugadaga Rd. UST 3860; 2542.38.027 (25822) Margaret Bay USTs; 2542.38.029 (1884) Fort Mears USTs, Amaknak Island; 2542.38.029 (25816) Fort Mears Hospital UST; 2542.38.029 (25823) Fort Mears UST 820; 2542.38.033 (25843) Summer Bay AST and 55-Gallon Drum. | Meredith Savage |
| 8/20/2015 | Site Characterization Workplan Approved | The ADEC Contaminated Sites Program received the Final Dutch Harbor Limited Removal Action Work Plan, Amaknak and Unalaska Islands, Alaska. The work plan was not formally approved, but ADEC does not object to the site characterization portions of the work plan. A report should be submitted documenting these site characterization activities. A separate work plan or work plan addendum should be submitted for the limited removal action anticipated for summer of 2016, which details the proposed work as required in 18 AAC 75.360. | Jessica Morris |
| 5/5/2016 | Update or Other Action | The 2015 Phase I Investigation Summary Dutch Harbor Limited Removal Action Amaknak and Unalaska Islands, Alaska was submitted on May 1, 2016 and approved by ADEC. This report discussed Phase I RA activities at 9 sites. No visual or olfactory indictors of contamination were observed in either test pit near UST 2674. All analytical sample results were below ADEC cleanup levels. Historical DRO detections (309 and 649 milligrams per kilogram [mg/kg]) (USACE 1999) have likely naturally attenuated or represent de minimis concentrations of DRO in soil. Since no groundwater was found at the site, the ADEC ingestion cleanup level applies (8,250 mg/kg) and historical DRO concentrations are below the ADEC ingestion cleanup level. No further action is recommended. | Holly Weiss-Racine |
| 10/21/2016 | Document, Report, or Work plan Review - other | The 2016 Phase II Dutch Harbor Limited Removal Action Report for 9 sites on Amaknak and Unalaska Islands, Alaska was submitted on October 4, 2016 for review by ADEC. This report repeated the language from the Phase I RA report; no further action recommended at this site due to inaccessible contamination. | Holly Weiss-Racine |
| 8/21/2017 | Exposure Tracking Model Ranking | Initial ranking with ETM completed for source area id: 79241 name: UST 2674 | Linda (Qi) Liu |
| 10/23/2017 | Update or Other Action | ADEC approved final Dutch Harbor Limited Removal Action Report. | Linda (Qi) Liu |
| 8/18/2021 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 79241 UST 2674. | Cascade Galasso-Irish |
| 11/9/2021 | Update or Other Action | Site is being prioritized under the Amaknak FUDs RAB. As of the October RAB meeting, plan going forward is to resample the groundwater via temporary well point and attempt to close without institutional controls. | 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 |
| 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
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Requirements
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No associated sites were found.