Site Report: BPX Pad 37
| Site Name: | BPX Pad 37 |
|---|---|
| Address: | 2 Miles South of W Pad, Prudhoe Bay, AK 99734 |
| File Number: | 300.38.273 |
| Hazard ID: | 4622 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 70.265916 |
| Longitude: | -149.096861 |
| 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
Preliminary investigation conducted in 2001 indicated potential hydrocarbon contamination in portions of the gravel pad.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 4/8/2008 | Site Added to Database | Site added to the database. | Mitzi Read |
| 4/9/2008 | Site Characterization Workplan Approved | Received Phase II work plan for Pad 37. 29 boreholes are planned for the gravel pad and 4 for the surrounding tundra. Following field screening, samples will be analyzed fro DRO/RRO with 25% of samples also analyzed for GRO/BTEX. Additional characterization will be performed in summer 2008 in accordance with a supplemental work plan on an as-needed basis. | Bill O'Connell |
| 10/21/2008 | Site Characterization Report Approved | Received Phase II Report and Corrective Action Plan (CAP) for Pad 37. During the Phase II investigation, 32 boreholes were advanced at the gravel pad and four in the surrounding tundra. DRO was detected in gravel pad samples up to 3,410 mg/kg, GRO up to 1,190 mg/kg and benzene up to 0.049 mg/kg. Tundra samples contained DRO up to 2,790 mg/kg but were not analyzed for GRO/BTEX. See next entry for CAP details. | Bill O'Connell |
| 10/21/2008 | Cleanup Plan Approved | Using data collected during the Phase II investigation, areas of the gravel pad will be segregated into areas of clean, conditional use, restricted use, and contaminated gravel. Approximtely 2,500 cy of conditional use gravel (DRO < 500 mg/kg) will be used as backfill in the reserve pit. Clean gravel will be used on site as needed or transported offsite for storage and reuse. Contaminated gravel surrounding the wellheads is considered E&P RCRA exempt and will be hauled to DS4 for injection. Approximately 5,700 cy of contaminated gravel from the pad, as well as impacted tundra material from four areas will be hauled to east dock for landfarming. Excavation of impacted gravel will be guided using a PID to field screen samples and analysis of selected samples for TPH by method 418.1. After field screening indicates contaminated material has been removed, composite soil samples consisting of 3-5 subsamples will be collected from the base of the excavation in areas where contaminated gravel had been identified. If chosen for GRO/BTEX analyses, composite samples will remain frozen until placed into the sample container with the appropriate preservative. Samples for DRO analyses will be thawed, thoroughly mixed, then placed into sample containers. Composite samples will be collected at a ferquency of one sample per 5,000 square feet of excavation bottom where restricted use and contaminated gravel was present. If excavation proceeds into the underlying tundra material, this frequency will be increased to one sample per 2,500 square feet. A discrete sample will be collected from any location where DRO exceeded 2,000 mg/kg during Phase II sampling. | Bill O'Connell |
| 10/24/2008 | Exposure Tracking Model Ranking | Initial ranking with ETM completed for source area id: 78577 name: Historical DRO contamination | Bill O'Connell |
| 11/16/2009 | Document, Report, or Work plan Review - other | Reviewed Pad 37 Corrective Action Report. The entire gravel pad and former access road were removed and the gravel classified as clean, conditional use, restricted use, and contaminated based on Phase II data plus additional stockpile sampling where necessary. Appropximately 63,845 cy of clean gravel was removed, largely from the former road and transported off site for reuse, with another 23,700 cy of clean gravel used onsite for backfill. Gravel from several areas of the pad was stockpiled on site then sampled to determine reuse. Approximately 450 cy of conditional use gravel from Area F and 1,350 cy of conditional use gravel from Areas A and C were used as backfill in the bottom of the reserve pit. Approximately 5,240 cy of restricted use and contaminated gravel and tundra material was transported to East Dock Landfarm for treatment. Confirmation samples were collected from areas of the pad footprint where hydrocarbon impacted gravel had been removed. Confirmation samples contained DRO up to 459 mg/kg. BTEX and PAHs were not detected above cleanup levels | Bill O'Connell |
| 11/17/2009 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 78577 Historical DRO contamination. | Bill O'Connell |
| 11/24/2009 | 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 Pad 37 located near 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 | Other | 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.