Site Report: Hilcorp Construction Camp 2A Fire Training Ground
| Site Name: | Hilcorp Construction Camp 2A Fire Training Ground |
|---|---|
| Address: | NE corner of Construction Camp 2A in Western Operating Area, Prudhoe Bay, AK 99734 |
| File Number: | 300.38.331 |
| Hazard ID: | 27974 |
| Status: | Active |
| Staff: | Laura Jacobs, 9074512911 laura.jacobs@alaska.gov |
| Latitude: | 70.326399 |
| Longitude: | -148.866758 |
| 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
Fire training activities at Construction Camp 2A (CC2A) were reported to have been conducted once per week for six years. Foaming chemicals used were either aqueous film forming foam (AFFF) in a 3 percent solution, or AFFF/alcohol type concentrate (ATC) in 3 to 6 percent solutions. The preliminary site investigation activities were performed in June, July, August, and September 2019. Six soil borings were completed, and six monitoring wells were installed outside the CC2A site liner. Soil and water samples were collected and analyzed, and pad porewater elevation data was collected. Analytical results for soil samples collected from the six soil borings indicated PFOA/PFOS were not present at concentrations above their respective ADEC cleanup levels for Arctic Zone soils in 2021. Analytical results for pad porewater samples collected for PFOA were reported at concentrations below the ADEC cleanup levels (0.40 micrograms per liter [µg/L]) in all the monitoring wells. The highest concentration of PFOA was 0.34 µg/L at MW-03 on the west side of the liner. Analytical results for pad porewater samples collected for PFOS were reported at concentrations above the ADEC CL (0.40 µg/L) in all the monitoring wells. The highest concentration of PFOS was at MW-03 at 40 µg/L.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 10/11/2024 | Site Added to Database | A new site has been added to the database | Evonne Reese |
| 10/16/2024 | Potentially Responsible Party/State Interest Letter | A Potentially Responsible Party letter was sent to the Responsible Party as notice of the liability for contamination identified at the Hilcorp Construction Camp 2A Fire Training Ground within the Prudhoe Bay Unit via a Certified Mail. | Laura Jacobs |
| 10/30/2024 | Document, Report, or Work plan Review - other | The 2023 Fire Training Ground PFOA/PFOS Investigation Report received March 1, 2024 was reviewed. Water quality monitoring activities consisted of collecting water from four surface water locations: SW-01, SW-03, SW-06, and SW-07. The surface water samples were submitted for analysis of two analytes of per- and poly-fluoroalkyl substances (PFAS). No deviations from the previously approved work plan were reported. The surface water samples from four locations had detections of both perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), with exceedances of DEC’s Table C. Groundwater Cleanup Level for PFOS in all four surface water samples. In addition to requesting a copy of the laboratory results, DEC requested additional remediation efforts to reduce the extent of contaminant release to area surface waters. | Laura Jacobs |
| 1/23/2026 | Document, Report, or Work plan Review - other | There are continued exceedances in surface water results (2020, 2021, 2022 and 2023) and in porewater results across the pad in: six monitoring wells in 2020, nine of 10 wells in 2021, and in both wells in 2022. The extent of the continued release into area surface waters of levels of PFAS above the Table C. Groundwater Cleanup Levels from the pad requires some immediate remediation efforts. The continued release of hazardous substances from the pad into area surface waters must be prevented as required by 18 AAC 75.325 which states a responsible person shall to the maximum extent practicable meet the applicable cleanup levels determined under 18 AAC 75.340 – 18 AAC 75.350 as required to protect human health, safety, and welfare, and the environment. DEC has asked for additional work that will address this concern. | Laura Jacobs |
Contaminant Information
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Requirements
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There are no documents for this site report.
No associated sites were found.