Site Report: Alaska Commercial Co. - Margaret Bay
| Site Name: | Alaska Commercial Co. - Margaret Bay |
|---|---|
| Address: | Margaret Bay Subdivision, Unalaska, AK 99685 |
| File Number: | 2542.38.027 |
| Hazard ID: | 1903 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 53.883641 |
| Longitude: | -166.553672 |
| 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
During site preparation work for building the AC store, abandoned underground storage tanks (USTs) and fuel-contaminated soil was identified. Research on the site indicated that a WWII Fort Mears Gas Station had been present on the property. The presence of ten 6,000-gallon USTs was confirmed (9 gasoline and 1 diesel fuel). The gas station USTs were used to service motor vehicles. The site is located approximately 100 feet south of the Dutch Harbor Post Office and currently is capped with asphalt and part of the AC Value Center parking lot. The ten USTs were removed along with 2,950 cy of petroleum-contaminated soil which was taken offsite and thermally treated. Confirmation samples were taken in undisturbed soil along the perimeter of the excavation, with the highest concentrations of GRO and DRO being 89 ppm and 181 ppm, respectively. Lead was found at 30.1ppm in one sample, and groundwater, although observed intermittently, was not sampled. The site is owned by Ounalashka Corp. and leased to Alaska Diversified Corp. and subleased to Alaska Commercial. Margaret Bay Subdivision, excluding lot 2 block 1, filed under plat number 92-3, Aleutian Islands Recording District, Third Judicial District, State of Alaska. (This site was formerly tracked under Hazard ID 25818, file number 2542.38.029, but all information has been consolidated into Hazard ID 1903, file number 2542.38.027.)
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 9/23/1993 | Site Added to Database | Petroleum contamination. | Former Staff |
| 10/1/1993 | Site Ranked Using the AHRM | Initial ranking. | Former Staff |
| 7/25/1996 | Leaking Underground Storage Tank Corrective Action Underway | LUST corrective action underway. | John Halverson |
| 8/23/1996 | Interim Removal Action Approved | ADEC received the 1996 Field Effort Workplan for Margaret Bay and General's Hill UST Remedial Action; Pre WWII Tank Farm Remedial Investigation, dated August 1996 (Jacobs Eng.). It called for removal of the USTs, excavation and thermal treatment of contaminated soil. | John Halverson |
| 8/3/1998 | Site Characterization Workplan Approved | ADEC received the Workplan Addendum UST Pipeline Removals, Thermal Operations, Other RI, IRA and SI Tasks, dated July 1998 (Jacobs Eng.). The plan included a section on installing groundwater monitoring wells at the Fort Mears Gas Station (aka Alaska Commercial). | John Halverson |
| 8/5/1998 | Update or Other Action | ADEC received the 1996 Interim Removal Action/Investigation Report, dated August 1998 (Jacobs Eng.). It documents that 10 USTs were removed from the former Fort Mears Gas Station; approximately 3000 cubic yards of contaminated soil were removed and thermally treated on Island; installation of groundwater monitoring wells was recommended. | John Halverson |
| 8/25/1999 | Update or Other Action | ADEC received the 1998 SI/RI/IRA Report on Amaknak and Unalaska Islands, dated August 1999 (Jacobs Eng.). Six soil borings and monitoring wells were installed at the former gas station site. Groundwater sample results met the Table C groundwater cleanup levels. The report recommends evaluating whether the low level DRO could pose a potential risk to surface water (will be addressed in the comprehensive RI report). | John Halverson |
| 6/5/2000 | Site Characterization Report Approved | ADEC received the final Comprehensive Remedial Investigation Report - Amaknak and Unalaska Islands, May 2000, by Jacobs Engineering for the Corps of Engineers. The groundwater monitoring data shows arsenic and zinc above background levels. There was conflicting data between the soil boring log (showed fuel contamination) and the groundwater sample result (met cleanup levels) from MW2. Further groundwater monitoring planned in 2000. | John Halverson |
| 9/5/2001 | Update or Other Action | ADEC received the final 2000 Island-wide SI, IRA, RI Report from Jacobs Engineering. Groundwater at MW2 was resampled and analyzed. No contaminants were found above applicable cleanup levels. | John Halverson |
| 12/28/2001 | Update or Other Action | ADEC received the final Monitoring Well Decommissioning Report for several sites on Amaknak and Unalaska Islands. The Corps contractor had resampled MW2 and requested a rush analysis. In accordance with the workplan, the contractor permanently closed monitoring wells at the Fort Mears Gas Station (AC Store site) after receiving confirmation sample results that groundwater meets applicable cleanup levels. No further fieldwork is planned. This site is proposed for no further action and will be included in a future proposed plan and decision document. | John Halverson |
| 7/12/2006 | Update or Other Action | File number issued 2542.38.027. | Aggie Blandford |
| 5/14/2008 | Exposure Tracking Model Ranking | Initial ranking with ETM completed. | John Halverson |
| 7/6/2017 | Update or Other Action | A duplicate site record was discovered. This site was formerly tracked under Hazard ID 25818, file number 2542.38.029, but all information has been consolidated into Hazard ID 1903, file number 2542.38.027. | Mitzi Read |
| 8/29/2017 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 72881 Military USTs. | Linda (Qi) Liu |
| 9/5/2017 | Cleanup Complete Determination Issued | ADEC issued a closure letter after completing a review of environmental records associated with the site. | Linda (Qi) Liu |
| 7/5/2019 | 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 |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | < Method 2 Most Stringent | Soil | The DRO detections found at the site never exceed the most restrictive ADEC Method 2 soil cleanup level of 230 mg/kg. |
| GRO | < Method 2 Most Stringent | Soil | The GRO detections found at the site never exceed the most restrictive ADEC Method 2 soil cleanup level of 260 mg/kg. |
| Lead - Total | < Method 2 Most Stringent | Soil | The lead detections found at the site never exceed the most restrictive ADEC Method 2 soil cleanup level of 400 mg/kg. |
| DRO | < Table C | Groundwater | The DRO detections found at the site never exceed the ADEC Method 2 groundwater cleanup level of 1.5 mg/L. |
| DRO | < Method 2 Most Stringent | Soil | The DRO detections found at the site never exceed the most restrictive ADEC Method 2 soil cleanup level of 230 mg/kg. |
| GRO | < Method 2 Most Stringent | Soil | The GRO detections found at the site never exceed the most restrictive ADEC Method 2 soil cleanup level of 260 mg/kg. |
| Lead - Total | < Method 2 Most Stringent | Soil | The lead detections found at the site never exceed the most restrictive ADEC Method 2 soil cleanup level of 400 mg/kg. |
Control Type
| Type | Details |
|---|---|
| No ICs Required | |
| 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) | |
| 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.