Site Report: ConocoPhillips DS 2A Diesel Spill
| Site Name: | ConocoPhillips DS 2A Diesel Spill |
|---|---|
| Address: | Kuparuk Oil Field, Prudhoe Bay, AK 99734 |
| File Number: | 300.38.153 |
| Hazard ID: | 3976 |
| Status: | Cleanup Complete - Institutional Controls |
| Staff: | IC Unit, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 70.302800 |
| Longitude: | -150.015500 |
| 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
While excavating soil from a 1200 gallon produced water spill on DS 2A, unknown/historic contamination was discovered. Diesel range organic (DRO) levels ranged from 234 mg/kg to 15,300 mg/kg (base of northern sidewall under the manifold building). The historic spill is located within the central part of the pad which is greater than 250' away from the edge of the pad. URS (consultant) stated that off-site migration is unlikely. They state that the area containing DRO concentrations in excess of 500 mg/kg DRO does not extend more than 50' in any direction. Transferred from PERP 12/23/02.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 1/2/2003 | Site Added to Database | DRO contamination exists in the center of the pad. Site transferred from PERP. | Deborah Williams |
| 10/12/2007 | Exposure Tracking Model Ranking | Initial ranking | Bill O'Connell |
| 9/28/2010 | Update or Other Action | Spill response activities at the site included the removal and disposal of approximately 14 cubic yards (cy) of impacted snow and approximately 100 cy of contaminate gravel. Gravel excavation was limited as the spill impacted an area beneath the manifold module which could not be fully excavated. Confirmation samples collected following excavation activities contained DRO up to 15,300 mg/kg at the base of the excavation. Delineation of the impacted area occurred in July 2002 when soil gas screening and additional analytical sampling was conducted. The results of the investigation indicated the contaminated area did not extend beyond the area already characterized and did not impact other areas of the pad. | Bill O'Connell |
| 9/29/2010 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 74950 Produced water spill. | Bill O'Connell |
| 10/7/2010 | Cleanup Complete Determination Issued | The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) has completed a review of the environmental records associated with ConocoPhillips DS 2A Diesel Spill located near Kuparuk, Alaska. Based on the information provided to date and the administrative record, it has been determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment and no further remedial action will be required as long as the site is in compliance with established institutional controls (ICs). | Bill O'Connell |
| 10/14/2010 | Institutional Control Record Established | Institutional Controls established and entered into the database. | Bill O'Connell |
| 5/30/2012 | Institutional Control Compliance Review | IC review conducted and reminder system set-up for 2015 follow-up with responsible party. Project manager changed from Bill O'Connell to IC Unit. | Kristin Thompson |
| 12/4/2014 | Update or Other Action | Staff name changed from IC Unit to McLoone | Evonne Reese |
| 11/16/2015 | Institutional Control Periodic Reporting | Email on today's date from Conoco confirming this pad is still be used as a production drill site and the Manifold Module is also still in use. | Keather McLoone |
| 9/28/2016 | Update or Other Action | At this time, the project manager chooses to retain management of this site which has institutional controls. | IC Unit |
| 3/2/2021 | Institutional Control Compliance Review | An IC compliance review was started on this date. A letter to the RP will be issued in early 2021 and land use conditions will be verified. | Evonne Reese |
| 3/19/2024 | Institutional Control Update | DNR-SAIL added as affiliate (Office of Primary Responsibility). For DNR LAS information: ADL# 420775 | Jennifer McGrath |
| 5/31/2024 | Institutional Control Compliance Review | IC compliance review completed on this date. An IC reminder letter was e-mailed to the landowner. The next review will be in five years’ time. | Gaige Robinson |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | > Method 1 (Arctic only) | Soil |
Control Type
| Type | Details |
|---|---|
| Signed CS Determination |
Requirements
| Description | Details |
|---|---|
| Advance approval required to transport soil or groundwater off-site. | |
| When Contaminated Soil is Accessible, Remediation Should Occur |
No associated sites were found.