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Site Report: Alyeska PS 06 Former Turbine Fuel Loading

Site Name: Alyeska PS 06 Former Turbine Fuel Loading
Address: Mile 55 Dalton Highway, Pump Station 6 - Alyeska MP 355, Stevens Village, AK 99774
File Number: 330.38.074
Hazard ID: 1731
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229
Latitude: 65.854018
Longitude: -149.735280
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.


Soil contamination was discovered at Pump Station (PS) 06 during a September 1992 upgrade project involving the installation of a lined spill containment cell beneath the turbine fuel loading area. Approximately 1,400 cubic yards of soil containing petroleum hydrocarbon concentrations exceeding ADEC target levels were excavated. This area was near the Pump Station office within the fenced portion of PS 06 - to be differentiated from 330.38.007 (Alyeska PS 06 Leach Field /Fuel Island) which is to the northeast and outside the fenced area. PS 06 is now referred to as the Yukon Response Base by Alyeska.

Action Information

Action Date Action Description DEC Staff
12/16/1992 Update or Other Action Received Corrective Action Report - Pump Station 6 - Turbine Fuel Loading Dike Area. Excavation of 1,400 cubic yards petroleum contaminated soil . Groundwater seeped into the excavation and fuel floated on its surface in some areas. Excavation extent was limited by the presence of buildings and piping, was stopped at a depth of 8 feet when frozen ground was encountered, and not completed beneath the liner footprint that was being installed. Two samples collected after excavation had detectable concentrations of benzene (0.18 and 1.05 mg/kg) and many DRO results above criteria up to 21,000 mg/kg. Highest concentrations remaining beneath utilities and piping. Keather McLoone
8/13/1993 Update or Other Action Received Contamination Assessment Report for the Turbine Fuel Offloading Area at Pump Station 6. In efforts to determine the extent of contamination, eight bore holes were advanced with five completed as temporary monitoring wells. Soil samples were collected from depths of 3 to 21.5 feet bgs in the borings. Only three of the borings located within the area of remaining contamination, contained DRO up to 3,000 mg/kg and benzene up to 0.06 mg/kg from samples collected 7 to 15 feet bgs. Seasonal saturation zone groundwater samples collected from five temporary monitoring wells were below drinking water MCLs (benzene 0.0003 mg/L). Prior to sampling, sheen was noted on two of the temporary monitoring wells located within the area of remaining contamination. Groundwater was encountered 6.68 to 10.44 feet bgs. Investigation of the vertical extent of contamination was limited be by the liner in the loading arm source areas. Frozen soil was encountered at 8 feet bgs. Keather McLoone
1/16/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Keather McLoone
11/12/2014 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 06 Former Turbine Fuel Loading. 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
11/12/2014 Institutional Control Record Established Institutional Controls established and entered into the database. Grant Lidren
12/17/2014 Update or Other Action ADEC received a signed CC-IC agreement from Alyeska on this date. 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 November 2019. Nathan Maxwell
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 SoilOutdoor Air
Benzene Between Method 2 Migration to Groundwater and 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.
Groundwater Use Restrictions Installation of groundwater wells at this site will require approval from ADEC.
When Contaminated Soil is Accessible, Remediation Should Occur The soil contamination located under the offloading building with associated electric and turbine fuel lines is currently inaccessible. When the offloading building with associated electric and turbine fuel lines are decommissioned and/or the soil becomes accessible, the soil must be evaluated to the satisfaction of 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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