Site Report: Swanson River Well Pad 31-16
| Site Name: | Swanson River Well Pad 31-16 |
|---|---|
| Address: | ~2 Mile Swanson River Production Facility Road, Swanson River Oil Field; ~12 Mile North of Stirling, Sterling, AK 99672 |
| File Number: | 2334.38.057 |
| Hazard ID: | 26335 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 60.706889 |
| Longitude: | -150.864444 |
| 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
On July 13, 2011 contaminated soil was discovered during excavation activities at Swanson River Well Pad 31-16. The contamination was in the area of a riser valve for an inactive flow line. The pipelines passing through the area were reported to be intact. The source of the release has not been determined. Field conditions indicate that the contamination is due to a release of produced water in an unknown quantity. There were no indications that there was an active spill and current operations and management programs are in place to prevent future releases of this nature. No remedial actions have taken place, but will be addressed during future well pad abandonment.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 1/15/2015 | Spill Transferred from Prevention Preparedness and Response Program | Spill transferred by PERP staff Don Fritz. Spill no. 11239919401; spill date = 7/13/11; substance = produced water; quantity = unknown. | Mitzi Read |
| 1/22/2015 | Site Added to Database | A new site has been added to the database | Mitzi Read |
| 1/28/2015 | Exposure Tracking Model Ranking | Initial ranking with ETM completed for source area id: 79729 name: Swanson River Well Pad 31-16 | Mitzi Read |
| 2/6/2015 | Potentially Responsible Party/State Interest Letter | Request for workplan to delineate the extent of contamination. | Peter Campbell |
| 8/2/2017 | Document, Report, or Work plan Review - other | Review and approve Removal Action Work Plan for SCU 34-9. This is a change in the pad name from the original Pad 31-16. The work plan calls for the field screening and excavation of what is estimated to be a small quantity (1-2 cy) of contaminated material. | Peter Campbell |
| 10/30/2017 | Update or Other Action | Hilcorp has excavated approximately 8 cubic yards of material, with one cubic yard of contaminated soil contained in a super sack on site. Chromium VI is driving the cleanup at this point. Hilcorp has proposed placing an indicator liner and backfilling the excavation for the winter. ADEC will allow backfill. | Peter Campbell |
| 10/9/2019 | Document, Report, or Work plan Review - other | Review the Remedial Action for Swanson Creek Unit (SCU) 34-9 which is where the abandoned well 31A-16 was located. This report covered additional excavation at the well site to address elevated DRO, total chromium and arsenic. An additional cubic yard of material was removed from the site, confirmation samples indicate that no residual contamination remains at the site. Site is ready for closure. | Peter Campbell |
| 10/14/2019 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 79729 Swanson River Well Pad 31-16. | Peter Campbell |
| 10/16/2019 | Cleanup Complete Determination Issued | Peter Campbell |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| Chromium +6 | < Method 2 Most Stringent | Soil |
Control Type
| Type | Details |
|---|---|
| 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) |
No associated sites were found.