Site Report: Selawik Water Treatment Plant
| Site Name: | Selawik Water Treatment Plant |
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| Address: | Across from 2600 Muskox Pkwy, Selawik, AK 99770 |
| File Number: | 500.38.008 |
| Hazard ID: | 27726 |
| Status: | Active |
| Staff: | Pax Templeton, 9072697691 pax.templeton@alaska.gov |
| Latitude: | 66.604100 |
| Longitude: | -160.012300 |
| 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
A tank overfill occurred in November 2020 when an employee began a tank tranfer at a 5,000 gallon day tank and walked away. It is estimated that approximately 7 hours passed before it was discovered and the rate is estimated to be 1000 gal/hour. There was an unknown amount of fuel in the tank before the transfer. A site assessment was performed in July 2021 and indicated soil contamination and visible sheen on the groundwater.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 12/2/2020 | Potentially Responsible Party/State Interest Letter | A PRP letter was sent by T. Huelskoetter on December 2, 2020 | Mandy Salminen |
| 3/9/2022 | Spill Transferred from Prevention Preparedness and Response Program | Selawik Water Treatment Plant Diesel Overfill; Spill #: 20389933001; File #: 500.02.002; PPR Staff: Kimberley Maher | Mandy Salminen |
| 3/17/2022 | Site Added to Database | A new site has been added to the database | Mandy Salminen |
| 3/29/2022 | Exposure Tracking Model Ranking | Initial ranking with ETM completed for source area id: 81176 name: Selawik Water Treatment Plant | Laura Jacobs |
| 4/8/2022 | Document, Report, or Work plan Review - other | Staff completed a review of the site assessment report submitted to document the release of diesel fuel near the day tank of the Water Treatment Plant. Soil samples resulted in levels of diesel range organics above the Human Health cleanup level in a test pit near the source area. Groundwater samples were not collected at the time although was very shallow and appeared in all of the nine test pits that were no deeper than six inches below ground surface. | Laura Jacobs |
| 6/24/2022 | Document, Report, or Work plan Review - other | A work plan was approved to conduct additional site characterization in an effort to determine treatment options. Well points will be installed and sampled in five locations, three locations along the edge of the dead vegetation, one upgradient of the spill area, and one directly adjacent to the source area. A drinking water sample from the raw water intake will be collected and analyzed for gasoline range organics, diesel range organics, volatile organic compounds, and polyaromatic hydrocarbons. Well points will be surveyed to document well locations and topography. The consultant also plans to conduct a drone survey of the spill site and surrounding areas to document the spill's impact to vegetation, and collect elevation data of the area. | Laura Jacobs |
| 12/20/2022 | Document, Report, or Work plan Review - other | The Selawik Water Treatment Plant Diesel Overfill Site Characterization Report was reviewed and approved. Petroleum contamination remains at the Selawik Water Treatment Plant (WTP) based upon soil pit data, and the extent of impacted vegetation. Standing water exhibits sheen when disturbed due to the depth of sedge vegetation/peat layer acting like a sponge. Surface water samples had concentrations of petroleum contamination exceeding the DEC cleanup level. There is not, however, a nexus that would connect the surface water from the spill to an offsite property to the north, beyond the road. The area appears to be a low point in comparison to other nearby areas. | Laura Jacobs |
Contaminant Information
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Control Type
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Requirements
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No associated sites were found.