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Site Report: Dutch Hbr-Upper Unalaska Vly 165th Road and Ugadaga Road UST 3860

Site Name: Dutch Hbr-Upper Unalaska Vly 165th Road and Ugadaga Road UST 3860
Address: 3 Miles SE of City of Unalaska; SW of 165th Road, Unalaska, AK 99685
File Number: 2542.38.023
Hazard ID: 25811
Status: Active
Staff: Kathleen Iler-Galau, 9074512153 kathleen.iler-galau@alaska.gov
Latitude: 53.852817
Longitude: -166.483330
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

In 1997 a 3' diameter heating oil tank associated with a former mess hall in Unalaska Valley north of 165th Road. UST 3860 was full of slightly turbid water that had a fuel odor. The tank was decommissioned in place in 2000 and 280 gallons of water was removed and disposed off site. One sample was collected from each end of the tank and analyzed for DRO, RRO, VOC and PAH. The southwest boring was placed three feet from the end of the tank and advanced to 5 feet bgs. Both borings were advanced to below the bottom of the tank and both encountered a strong fuel odor throughout the borings. DRO was found in exceedance at 275 mg/kg and 1,070 mg/kg. TOC results were used to calculate site-specific method 3 ACLs. Site is adjacent of ADEC site "Dutch Hbr-Upper Unalaska Vly 165th Road and Ugadaga Road UST 3760," Hazard ID 25810. Soil samples were collected in 2015 to verify the 2000 results. DRO was detected up to 6,800 mg/kg, below the prior ACL calculations. However, naphthalene was detected above the Method 3 calculated ACL (.3 mg/kg), at a maximum concentration of .572 mg/kg.

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 Document, Report, or Work plan Review - other 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. DOR was observed in test pits at this site blow the site specific cleanup level (7,390 mg/kg). Water was noted seeping into test pit TP01 at about 4 feet BGS. 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. Holly Weiss-Racine
10/23/2017 Update or Other Action ADEC approved final Dutch Harbor Limited Removal Action Report. Linda (Qi) Liu
3/8/2022 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79240 name: UST 3860 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
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
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
4/17/2025 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79240 UST 3860. Juliana Smit

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details
Hazard ID Site Name File Number
25810 Dutch Hbr-Upper Unalaska Vly 165th Road and Ugadaga Road UST 3760 2542.38.023

Missing Location Data

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