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Site Report: Alyeska Remote Gate Valve 35A

Site Name: Alyeska Remote Gate Valve 35A
Address: ~600 Feet SW of MP 218 Dalton Highway; ~40 Miles N of Coldfoot; Pipeline MP 193.96, Coldfoot, AK 99701
File Number: 330.38.125
Hazard ID: 26247
Status: Cleanup Complete
Staff: ,
Latitude: 67.798093
Longitude: -149.819348
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 6/12/13 crude oil was discovered in the galvanized steel sump at Alyeska pipeline remote gate valve (RGV) 35A. RGV 35A is located at Trans Alaska Pipeline milepost 193.96, near milepost 218 of the Dalton Highway. Initial response activities included recovery of 21 gallons of crude oil and removal of 2 cubic yards of contaminated soil. Additionally, 8 drums of water/oil saturated soils were removed. Analytical results indicated the presence of weathered hydrocarbons upgradient and downgradient of the vault. Diesel range organics and residual range organics were confirmed in groundwater above DEC cleanup levels, however soil samples collected were below.

Action Information

Action Date Action Description DEC Staff
6/23/2014 Site Characterization Workplan Approved The Alaska Department of Environmental Conservation (ADEC) Contaminated Sites Program (CSP) has received and reviewed the 2014 Work Plan RGV-35A submitted by SLR and dated May 2014. ADEC has no objections to the Work Plan and Alyeska may proceed with the following conditions: 1. The groundwater must be analyzed for GRO and BTEX; 2. This site appears to be below the 68o North latitude which is defined as the Arctic Zone in 18 AAC 75.990. Therefore it is assumed this site is in the Under 40 Inch Zone. However, if SLR believes this site is located within the arctic zone, ADEC will require additional site specific data for our records. Grant Lidren
6/27/2014 Spill Transferred from Prevention Preparedness and Response Program Spill transferred by PERP staff John Ebel. Spill no. 13399916302; spill date = 6/12/13; substance = crude oil; quantity = unknown; PERP file no. 330.02.053. Mitzi Read
7/7/2014 Site Added to Database A new site has been added to the database Mitzi Read
7/7/2014 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79643 name: Crude Oil - Remote Gate Valve 35A Mitzi Read
7/10/2014 Potentially Responsible Party/State Interest Letter PRP letter sent to Alyeska on this date. Grant Lidren
1/9/2015 Site Characterization Report Approved On this date, ADEC received the 2014 Groundwater Monitoring Report Remote Gate Valve 35A submitted by SLR dated December 2014. MW-3 sampled on 7/25/14 for DRO and RRO contained detectable levels of DRO and RRO, but below ADEC Table C groundwater cleanup levels. MW-3 sampled again on 8/25/14, for GRO, DRO, RRO, and BTEX did not contain detectable levels of contaminants. Grant Lidren
3/3/2015 Cleanup Complete Determination Issued The Alaska Department of Environmental Conservation (ADEC), Contaminated Sites Program, has completed a review of the environmental records associated with this site. 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
7/8/2015 Update or Other Action On this date; MW-1, MW-2, and MW-3 were decommissioned. SLR pulled the 1/4-inch outer diameter tubing connected to the stainless sampling points and filled the holes to the maximum extent possible with powdered bentonite. Grant Lidren

Contaminant Information

Name Level Description Media Comments
DRO < Table C Groundwater
RRO < Table C Groundwater

Control Type

Type Details
No ICs Required


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

Missing Location Data

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