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Site Report: Alyeska PS 10 Tank 209

Site Name: Alyeska PS 10 Tank 209
Address: Mile 218 Richardson Hwy Alyeska MP 586, 50 Miles S. of Delta Jct., Paxson, AK 99737
File Number: 330.38.024
Hazard ID: 2358
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229
Latitude: 63.424100
Longitude: -145.765500
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.


On February 16, 1994, Tank #209 was overfilled, spilling over 3,000 gallons of crude oil. The cause was thought to be failure of a fill-sensing instrument due to extremely cold weather. The spill was discovered on February 26, 1994. Spill response actions resulted in 3,000 gallons of crude oil being recovered. Residual crude oil remains in the fill soil overlying the geomembrane liner (2 feet below ground surface [BGS]) in the tank containment area. Two samples were collected 6 inches below ground surface but above the liner with results of 9,300 parts per million (ppm) and 15,000 ppm diesel range organics (DRO). Two samples were taken right above the liner (~2 feet BGS) with results of 1,000 ppm and 440 ppm DRO. Due to standing water in the area of contamination, the liner was assumed to be intact.

Action Information

Action Date Action Description DEC Staff
6/23/1994 Report or Workplan Review - Other Date of DEC letter stating that the gross contamination was removed and treated. Requests samples be collected and following that data collection, the spill response will be determined to be adequate. The intent was that the contamination be addressed when the tank is taken out of service. Keather McLoone
9/20/1994 Report or Workplan Review - Other Date of report for results of soil sampling and analysis. This release was contained over a geomembrane liner, but further investigation regarding integrity of liner was not conducted. However, standing water over the liner suggests that it remained intact. Keather McLoone
11/27/1994 Update or Other Action Date of letter from DEC stating that site work, including remediation, might be postponed until Tank 209 was taken out of service. Keather McLoone
12/28/2000 Site Added to Database Crude oil. Bruce Wanstall
1/10/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Keather McLoone
11/7/2011 Update or Other Action Email to Alyeska asking to confirm whether Tank 209 is still in service in preparation for writing a decision letter for this site if it is still in service. Keather McLoone
11/13/2012 Meeting or Teleconference Held Met with Alyeska (Jan Shifflett) and SLR International (Scott Rose) about conducting additional characterization in 2013. Given the age of the release event (approx. 19 years ago), small estimated volume of crude that was left in place, and inaccessibility of remaining petroleum.. Richard Bernhardt
5/24/2013 Site Characterization Workplan Approved Received and approved a work plan to collect soil samples in the area affected by the 1994 release. Richard Bernhardt
1/2/2014 Site Characterization Report Approved On this date, ADEC received the 2013 Soil Sampling Report for PS 10 Tank 209 submitted by SLR dated December 2013. Two test pits were advanced in the approximate location of the 1994 soil samples T209-2 and T209-1 and five soil samples were collected. Three soil samples collected from visibly contaminated soil encountered at 0.7 feet bgs contained DRO up to 5,340 mg/kg and RRO up to 16,000 mg/kg. Two soil samples collected from the GW interface above the liner at 1.7 feet bgs contained DRO up to 59 mg/kg and RRO up to 5,340 mg/kg. Groundwater with sheen and accumulating crude oil droplets in the test pits were noted. Grant Lidren
5/7/2014 Cleanup Complete Determination Issued The Alaska Department of Environmental Conservation (ADEC), Contaminated Sites Program, has completed a review of the environmental records associated with the Alyeska PS 10 Tank 209. Based on the information provided to date and the administrative record, the ADEC has determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment. No further remedial action will be required as long as the site is in compliance with established institutional controls. Grant Lidren
5/7/2014 Institutional Control Record Established Institutional Controls established and entered into the database. Grant Lidren
5/9/2014 Update or Other Action On this date, ADEC received the signed CC-IC agreement from Alyeska. Grant Lidren
11/23/2015 Institutional Control Compliance Review IC compliance review conducted, staff name changed from Lidren to IC Unit, and reminder system set to review the site record in May 2019. Nathan Maxwell
11/20/2017 Meeting or Teleconference Held Attended a meeting regarding the elimination of non-essential infrastructure at Pump Station 10. There are five Alyeska sites located at this pump station that have institutional controls and this site is one of them. Construction is in the planning stages and will not begin until 2019. The foundations for the buildings on the pad will remain in place so the residual contamination that may remain underneath the foundations will remain in place. Because of this, the project is not planning on addressing the known contaminated site issues. Verifying this detail should be included in the next IC compliance review. Evonne Reese
11/20/2017 Meeting or Teleconference Held Meeting with Alyeska on this date. Tank 209 will be removed in 2019 as part of the PS 10 Elimination of non-essential infrastructure. Grant Lidren
6/18/2018 Institutional Control Compliance Review IC compliance review conducted. Closure/IC Details updated. Kristin Thompson

Contaminant Information

Name Level Description Media Comments
DRO > Human Health/Ingestion/Inhalation Soil
RRO > Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
Signed CS Determination


Description Details
Advance approval required to transport soil or groundwater off-site. Standard condition.
When Contaminated Soil is Accessible, Remediation Should Occur The soil contamination located adjacent to Tank 209 is currently inaccessible. When the tanks and liner are removed and/or the soil becomes accessible, the soil must be evaluated to the satisfaction of ADEC.
Groundwater Use Restrictions Installation of groundwater wells at this site will require approval from ADEC.
Other Alyeska will report to ADEC every five years to document land use, or report as soon as they become aware of any changes in land ownership and/or use.
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) Standard condition.

Missing Location Data

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