Site Report: BPX Term Well C
| Site Name: | BPX Term Well C |
|---|---|
| Address: | Spine Road; 1.5 Miles South of S Pad, Prudhoe Bay, AK 99734 |
| File Number: | 300.38.282 |
| Hazard ID: | 25388 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 70.332700 |
| Longitude: | -149.054300 |
| 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
1991 soil samples reportedly contained benzene concentrations above ADEC cleanup levels, however the data have not been provided. A soil-gas survey in 2000 found one area of anomalous CO2 readings and heavy sheening was noted in surface water bodies adjacent the pad.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 4/8/2009 | Site Added to Database | A new site has been added to the database | Mitzi Read |
| 4/9/2009 | Exposure Tracking Model Ranking | Initial ranking with ETM completed for source area id: 78750 name: Historic diesel contamination | Bill O'Connell |
| 4/10/2009 | Site Characterization Workplan Approved | Received Phase II Site Assessment Work Plan Term Well C. The pad is approximately 6-8 feet above tundra grade and includes a reserve pit and potential flare pit. One well was drilled at the site that was suspended in 1979. The primary background investigation at this site occurred in 2001 with a CO2 survey, visual observation, and discrete soil and surface water sample collection. The CO2 survey indicated one are of potential hydrocarbon contamination and sheen was noted in several surface water bodies surrounding the pad. The 2009 investigation will include 35 boreholes at the gravel pad, 5 boreholes in the tundra and additional boreholes in the reserve pit and flare pit. Samples will be analyzed for DRO/RRO with about 25% of the samples also analyzed for BTEX. Additional site inspection will occur later in 2009. | Bill O'Connell |
| 9/21/2010 | Site Visit | Site visit with BPXA and consultant | Bill O'Connell |
| 10/25/2010 | Document, Report, or Work plan Review - other | Reviewed Phase II Site Assessment Report and Corrective Action Plan for Term Well C. 35 boreholes were driven into the gravel pad and reserve pit berms to a depth of approximately 5-8 feet and sampled. DRO was detected in one sample at 10,800 mg/kg in borehole GP-14. Two other boreholes contained DRO concentrations indicative of contamination include boreholes GP-12, where DRO was detected at 441 mg/kg at 2.5-3 feet bgs and GP-27, where DRO was detected at 552 mg/kg near the surface. Generally hydrocarbons were not detected in Phase II samples and the main gravel pad appears relatively free from significant quantities of contaminated material. Soil samples from two test pits excavated at the suspected location of the former flare pit did not contain detectable concentrations of contaminants. Proposed corrective action at the site includes removal of the entire gravel pad, access road, and reserve pit berms, excavating drilling waste and backfilling the reserve pit. Clean gravel not used as onsite backfill will be staged off site for reuse. It is anticipated that approximately 1,000 cubic yards of contaminated gravel will be excavated and hauled to East Dock landfarm for treatment. If it is necessary to create stockpiles in order to manage material onsite, samples will be collected from the stockpiles to characterize the material. | Bill O'Connell |
| 3/21/2012 | Document, Report, or Work plan Review - other | Reviewed Term Well C Corrective Action Report. The entire gravel pad and access road were removed from the site including approximately 875 cy of hydrocarbon contaminated material and over 37,000 cy of clean gravel. The contaminated material, consisting of gravel and tundra, was transported to the East Dock Landfarm for treatment. Clean gravel was used onsite to backfill the reserve pit and gravel pad excavations and the remainder was hauled offsite for reuse. Following removal of the gravel pad, confirmation soil samples were collected from the base of the excavation at locations where contaminants were detected during Phase II sampling. Confirmation samples contained DRO up to 570 mg/kg. The gravel pad excavation was backfilled to tundra grade using clean gravel, then topped with 6-12 inches of organic overburden to promote rehabilitation at the site. | Bill O'Connell |
| 4/6/2012 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 78750 Historic diesel contamination. | Bill O'Connell |
| 5/16/2012 | Cleanup Complete Determination Issued | The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) has completed a review of the environmental records associated with BPX Term Well C located in Prudhoe Bay, Alaska. 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 this site will be closed. | Bill O'Connell |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | > Method 1 (Arctic only) | Soil |
Control Type
| Type | Details |
|---|---|
| No ICs Required |
Requirements
| Description | Details |
|---|---|
| Advance approval required to transport soil or groundwater off-site. |
No associated sites were found.