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Site Report: Alyeska PS 04 Deadleg Excavation

Site Name: Alyeska PS 04 Deadleg Excavation
Address: Mile 269 Dalton Highway, Pipeline Mile 144, Anaktuvuk Pass, AK 99721
File Number: 330.38.020
Hazard ID: 167
Status: Active
Staff: Pax Templeton, 9072697691 pax.templeton@alaska.gov
Latitude: 68.422955
Longitude: -149.358226
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

Crude oil was observed in shot rock and water (meltwater) exposed at a reported depth of approximately 12 feet below ground surface in the excavation dug to enable the reinsulation of the pipeline deadleg at PS 04. According to Alyeska, the suspected source of contamination was a May 5, 1984 spill of 210 gallons of crude oil due to the failure of a seal on the pig launcher in the manifold building.

Action Information

Action Date Action Description DEC Staff
12/27/1993 Document, Report, or Work plan Review - other Date on document received January 5,1994 entitled Results of Water Sample Analysis, PS-4 Deadleg Excavation (1984 Spill Referenced in Alyeska Notification Letter No. 84-3669-C). A sample and duplicate was collected from the oily water directly from the meltwater surface. Results were 119 and 271 mg/L total recoverable petroleum hydrocarbon, 0.0033 and 0.0030 benzene, 0.0011 and 0.0010 mg/L toluene, 0.0024 and 0.0020 mg/L ethylbenzene, 0.0079 and 0.0062 mg/L p/m xylenes, and 0.0016 and 0.0014 mg/L o xylene. Soil samples were not collected for confirmation as the matix was described as too large to fit in standard sample containers (coarse gravel to cobble-sized clasts) at the base of the hole. Keather McLoone
3/16/1994 Update or Other Action Most recent document in file is DEC letter requesting a site assessment workplan based on the previously submitted report. Keather McLoone
1/22/2001 Site Added to Database Historical contamination by Crude Oil. Bruce Wanstall
1/22/2001 Site Ranked Using the AHRM Preliminary ranking. Deborah Williams
1/28/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Pam Clemens
2/1/2008 GIS Position Updated Updated using Arc GIS SPAR_StatewideLocator (ArcReader) Grant Lidren
11/1/2011 Update or Other Action File review to determine if this site can be considered a languishing site. Email on this date sent to Alyeska asking if the additional work recommended in the December 27, 1993 Emcon report was conducted. Keather McLoone
11/2/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 71147 manifold building piping AND update to workload prioritization to indicate this site appears to be "stalled" or "languishing". 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 (almost 30 years ago) and small estimated volume of crude involved (~210 gallons), some natural attenuation is likely. Richard Bernhardt
7/31/2018 Site Visit Visited site on this date with Alyeska and SLR. Grant Lidren
6/26/2019 Document, Report, or Work plan Review - other On this date, ADEC approved the Work Scope, Preparation of CSM; PS04 Deadleg Excavation Site submitted by SLR and dated June 25, 2019. Grant Lidren
10/22/2019 Document, Report, or Work plan Review - other On this date, ADEC received the PS04 Deadleg Excavation Site Conceptual Site Model Report submitted by SLR and dated October 21, 2019. Grant Lidren

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