Site Report: Dutch Hbr-Pyramid Valley USTs and Bldg 5264
| Site Name: | Dutch Hbr-Pyramid Valley USTs and Bldg 5264 |
|---|---|
| Address: | Pyramid Creek Road; Unalaska Island, Unalaska, AK 99685 |
| File Number: | 2542.38.017 |
| Hazard ID: | 25722 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 53.851670 |
| Longitude: | -166.559090 |
| 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
This site is located east of the Crowley Dock. No stained soils or USTs were found during a site inspection in 1997. Two samples were taken in 2002 to characterize soil with a fuel odor. DRO was found to be at concentrations of 15,000 mg/kg. 31 cubic yards of soil were excavated in 2005 and was limited by the presence of groundwater and historical buildings. Confirmation samples revealed exceedances of cleanup levels and an ACL was calculated. One sample exceeded the ACL of 8,300 mg/kg at 25,200 mg/kg. In 2016, an additional 48.7 tons was excavated from the site. None of the eight confirmation samples exceeded the calculated ACL of 8,300 mg/kg, and the maximum detected of DRO was 1,670 mg/kg.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 9/16/2011 | Site Added to Database | A new site has been added to the database | Mitzi Read |
| 9/23/2011 | Exposure Tracking Model Ranking | Initial ranking with ETM completed for source area id: 79160 name: Dutch Hbr-Pyramid Valley USTs and Bldg 5264 | Meghan Dooley |
| 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. All samples collected from test pits TP01 and TP06 contained concentrations of DRO above the ADEC cleanup level. DRO was detected in concentrations as high as 27,100 mg/kg at 3 feet bgs in TP06. The site was recommended for further action. | Holly Weiss-Racine |
| 10/23/2017 | Update or Other Action | ADEC approved final Dutch Harbor Limited Removal Action Report. | Linda (Qi) Liu |
| 9/29/2023 | 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 |
| 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 |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | Other | Soil | DRO concentrations are below the site-specific Method Three ACL of 8,300 mg/kg, at a max concentration of 1,670 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.