Site Report: Dutch Hbr-Unalaska Vly Ski Bowl Generator Bldg
| Site Name: | Dutch Hbr-Unalaska Vly Ski Bowl Generator Bldg |
|---|---|
| Address: | Ptarmigan Road, Unalaska, AK 99685 |
| File Number: | 2542.38.023 |
| Hazard ID: | 25804 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 53.864928 |
| Longitude: | -166.502480 |
| 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
This site is located in the Upper Unalaska Valley south of Ptarmigan Road. A concrete slab and 3 foot high building walls remain at the site. A test pit was dug in 2000 to investigate piping that was observed entering the building. 5 feet of piping and 10 cubic yards of contaminated soil were removed. Six soil samples were taken and analyzed for DRO, RRO, and PAHs. All samples exceeded the cleanup levels for DRO and ranged from 314 mg/kg to 4230 mg/kg. Three samples exceeded the cleanup level at the time for methylene chloride, ranging from 0.056 to 0.13 mg/kg. Three more soil samples were collected in 2001 near the previous excavation to determine the extent of contamination. Only one sample exceeded cleanup levels and contained DRO at 360 mg/kg. No groundwater was encountered at the site so no water samples were taken. TOC samples collected at the site were used to calculate a method three Alternative Cleanup Level for DRO, at 8,300 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 (25823) Fort Mears USTs; 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. Although some soil concentrations were above cleanup levels, groundwater was not encountered during 2015 sampling activities, therefore no further action was 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. | Holly Weiss-Racine |
| 10/23/2017 | Update or Other Action | ADEC approved final Dutch Harbor Limited Removal Action Report. | Linda (Qi) Liu |
| 11/1/2022 | Exposure Tracking Model Ranking | Initial ranking with ETM completed for source area id: 79236 name: Dutch Hbr-Unalaska Vly Ski Bowl Generator Bldg | Cascade Galasso-Irish |
| 11/1/2023 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 79236 Dutch Hbr-Unalaska Vly Ski Bowl Generator Bldg. | Cascade Galasso-Irish |
| 11/6/2023 | Cleanup Complete Determination Issued | On this date, a Cleanup Complete Determination was issued 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 | Remaining concentrations in soil are below the site-specific Method 3 ACL of 8,300 mg/kg. |
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.