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Site Report: ConocoPhillips West Sak River State B-10

Site Name: ConocoPhillips West Sak River State B-10
Address: Kuparuk River Unit, E of Ugnuravik River, ~26 Miles SW of Prudhoe Bay, Prudhoe Bay, AK 99734
File Number: 300.38.192
Hazard ID: 4582
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 70.202916
Longitude: -149.772792
Horizontal Datum:WGS84

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

Inactive oil and gas exploration site. Gravel pad was installed for drilling activities, which comenced on February 1978. The pit was plugged and abandoned March 1978. During a 2000 sampling event, soil samples indicated DRO up to 1,230 mg/kg. This contaminated soil was put into the bottom of the pit and capped with 18 inches of clean gravel. During a 2002 site investigation soil samples were taken 2"-6" bgs from an area with visual iron staining. Samples indicated DRO up to 986 mg/kg and benzene up to 0.0558 mg/kg. A proposed rehabilitation plan was received by the ADEC March 18, 2003.

Action Information

Action Date Action Description DEC Staff
7/15/2001 Update or Other Action West Sak River State B-10 final Report submitted by URS Grant Lidren
5/13/2002 Update or Other Action Final Cleanup Report for West Sak River State B-10 dated 4/25/2002 submitted by ConocoPhillips and recieved by ADEC on this date. Grant Lidren
3/18/2003 Update or Other Action West Sak River State B-10 Gravel Pad Investigation dated 12/9/2002 submitted be USR and recieved by ADEC on this date. Grant Lidren
3/18/2003 Update or Other Action Rehabilitation plan for west sak B10, Kuparuk Oilfield, Alaska dated 3/7/2003 submitted by ABR and recieved by the ADEC on this date Grant Lidren
11/30/2003 Update or Other Action On May 22, 2009, ADEC received Rehabilitation of West Sak B10 Exploratory Well Site 2003 Progress Report, submitted by ADR. Inc., dated November 30, 2003 Grant Lidren
3/15/2005 Update or Other Action On May 22, 2009, ADEC received Rehabilitation of West Sak B10 Exploratory Well Site 2004 Progress Report, submitted by ADR. Inc., dated March 2005 Grant Lidren
1/29/2008 Site Added to Database Site added to the database. Mitzi Read
1/29/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Grant Lidren
6/10/2009 Institutional Control Record Established Institutional Controls established and entered into the database. Grant Lidren
6/10/2009 Cleanup Complete Determination Issued There may be contamination remaining above established cleanup levels at West Sak River State B-10, but ADEC has determined there is no unacceptable risk to human health or the environment, and this site will be granted a Cleanup Complete- Institutional Controls Determination subject to the following: 1.Any future change in land use may impact the exposure assumptions cited in this document. If land use and/or ownership changes, current ICs may not be protective and ADEC may require additional remediation and/or ICs. Therefore ConocoPhillips shall report to ADEC concurrent with the reporting schedule for rehabilitation outlined in the Rehabilitation Plan dated July 2001 (with subsequent updates) or as soon as ConocoPhillips becomes aware of any change in land ownership and/or use, if earlier. The report should include any changes in land use and visual observations of sheen, thermokarsting, or other disturbances. The report can be sent to the ADEC project manager or electronically to DEC.ICUnit@alaska.gov. 2.A Notice of Residual Contamination will be recorded on the ADEC database to document that there is contamination remaining on site above the most stringent ADEC cleanup levels. 3.Any proposal to transport soil or groundwater off site requires ADEC approval in accordance with 18 AAC 75.325(i). 4.Movement or use of potentially contaminated soil in a manner that results in a violation of 18 AAC 70 water quality standards is unlawful. This determination is in accordance with 18 AAC 75.380(d) and does not preclude ADEC from requiring additional assessment and/or cleanup action if future information indicates that this site may pose an unacceptable risk to human health or the environment. Grant Lidren
7/22/2009 Update or Other Action ADEC received signed CC-IC agreement Grant Lidren
6/13/2012 Update or Other Action Staff changed from Grant Lidren to IC Unit. Kristin Thompson
7/9/2012 Institutional Control Compliance Review IC review conducted and additional details added to the reminder system record. Evonne Reese
7/29/2014 Institutional Control Update An IC reminder letter was issued to the responsible party on this date. Kristin Thompson
12/4/2014 Update or Other Action Staff name changed from IC Unit to McLoone. Evonne Reese
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
4/3/2017 Document, Report, or Work plan Review - other Reviewed the Rehabilitation of West Sak B-10 Exploratory Well Site, dated March 2017. A rehabilitation summary was provided, along with information from the most recent 2016 monitoring event. In summary, all performance standards have been met for the capped reserve pit, the former gravel pad, and the former reserve pit and flare pit berms. At this time, rehabilitation of West Sak B-10 is considered complete, and no further treatment or monitoring is planned. Joshua Barsis
2/3/2021 Institutional Control Compliance Review IC compliance review started. A combined letter for all ConocoPhillips sites with ICs will be issued in early 2021 and land use will be verified. Evonne Reese
5/30/2024 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
12/2/2024 Institutional Control Compliance Review The landowner responded to the IC reminder letter and provided a written confirmation that land use has not changed Gaige Robinson

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
Signed CS Determination

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.

No associated sites were found.

Missing Location Data

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
TDD: 800-770-8973
Physical Location: 410 Willoughby