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Site Report: Alyeska PS 01 Therminol Contamination

Site Name: Alyeska PS 01 Therminol Contamination
Address: Spine Road, Pipeline Mile 0, Deadhorse, AK 99734
File Number: 330.38.008
Hazard ID: 1744
Status: Cleanup Complete
Staff: ,
Latitude: 70.257900
Longitude: -148.620110
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.


In 1980, Therminol-44 leaked from Pump Station 01 (PS 01) and deteriorated the insulation on the existing pipe causing thawing of the soils underneath. In 1990, a pipe releveling and reinsulation project was conducted to fix the problem resulting in the excavation and stockpiling of 10,000 cubic yards of soil. Therminol-44 is a heat transfer fluid composed of hydrocarbons. The releveleing and reinsulation project was located adjacent to the turbine fuel/diesel offloading area at PS 01. PS 01, the origin of the pipeline, is currently pumping oil through the Trans-Alaska Pipeline System.

Action Information

Action Date Action Description DEC Staff
8/19/1991 Update or Other Action ADEC received the PS1 Releveling/Reinsulation Project Request for Backfilling Excavated Soils dated August 16, 1991 submitted by Alyeska Pipeline. Six borings were advanced in the area of the releveling/ insulation project. Seven soil samples collected at 5 and 9 feet below ground surface (bgs) and analyzed for VOCs contained PCE up to 0.025 mg/kg, which is above the ADEC method 2 MTG cleanup level of 0.25. Grant Lidren
10/28/1992 Site Added to Database Therminol 44 contaminated gravel. No Longer Assigned
10/28/1992 Update or Other Action (Old R:Base Action Code = NFA - No Further Action Required (CERCLA)). No Longer Assigned
1/15/1993 Update or Other Action ADEC received the Report of Findings Pump Station 1 Stockpile Assessment dated January 1993 submitted by CH2MHILL. During the pipe releveling and reinsulation project, 10,000 cubic yards of Therminol-44 contaminated soil was excavated and stockpiled in containment dikes. From the containment dikes, 3,200 cubic yards of stockpiled soils containing TPH concentration greater than 100 mg/kg was thermally remediated. It is assumed the remaining 6,800 cubic yards of soil was reused as fill at PS 01, some of which was used for construction of the extension of the pad in 1992. Grant Lidren
8/5/2002 Update or Other Action Correspondence sent to Alyeska (Andy Church) regarding discrepency in volume of soil that was thermally remediated and documentation of the verification of sampling that was agreed to of the less than 100 ppm therminol contaminated soils to assure off-site migration is not occurring. Deborah Williams
12/26/2007 Exposure Tracking Model Ranking Initial ranking with ETM completed. Keather McLoone
11/3/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 72722 Therminol leak. Workload prioritizaton info also updated. Keather McLoone
5/12/2014 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 01 Therminol Contamination. 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
5/12/2014 Institutional Control Record Removed Institutional Controls have been removed. Grant Lidren

Contaminant Information

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

Control Type

Type Details
No ICs Required


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

Missing Location Data

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