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Site Report: Beaver Creek Pad 1A Dehydration Building


Site Name: Beaver Creek Pad 1A Dehydration Building
Address: Marathon Road, Kenai, AK 99611
File Number: 2320.38.074
Hazard ID: 25917
Status: Active
Staff: Peter Campbell, 9072623412 peter.campbell@alaska.gov
Latitude: 60.647458
Longitude: -151.036355
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

During an excavation for installation of a new pipeline associated with a compressor project on September 4, 2012, a historical release was discovered in the area of an abandoned subterranean pipe. Approximately 33 cubic yards of contaminated soil was stockpiled on site for further characterization. Soil samples collected from the floor of the excavation detected diesel range organics (DRO) at 320 to 8,200 milligrams per kilogram (mg/kg) at 3.5 to 4.5 feet below ground surface and gasoline range organics (GRO) at 340 mg/kg at 3.5 feet below ground surface. The sidewall sample collected at 2 feet below ground surface detected DRO at 590 mg/kg. The contamination was determined to be a release of natural gas condensate. The excavation measured approximately 12 feet by 25 feet at a depth of up to 4 feet, but generally 3 feet or less in depth. Following characterization activities the excavation was backfilled with clean soil upon pipeline project completion.

Action Information

Action Date Action Description DEC Staff
9/20/2012 Conceptual Site Model Submitted The Initial Conceptual Site Model was submitted with the Initial Site Characterization Report, Beaver Creek Pad 1A, dated September 19, 2012, prepared by Weston Solutions. Human health exposure pathway via subsurface soil and or groundwater is potentially complete for future residents, current and future commercial/industrial, current and future construction works, future farmers or subsistence harvesters, and future subsistence consumers. Human health bathway via biota ingestion is potentially complete for future residents, future farmers or subsistenace harvesters, and future subsistence consumers. Alyce Hughey
9/20/2012 Site Added to Database A new site has been added to the database Alyce Hughey
9/20/2012 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79337 name: Abandoned Subterranean Pipe Alyce Hughey
9/24/2012 Offsite Soil or Groundwater Disposal Approved Peter Campbell approved for approximately 35 cubic yards of contaminated soil to be transported to the Kenai Peninsula Borough Landfill for disposal. Alyce Hughey
11/6/2013 Potentially Responsible Party/State Interest Letter Certified mail return receipt received in Soldotna office on November 6, 2013. Alyce Hughey
9/25/2014 Report or Workplan Review - Other Review and approve work plan for the investigation of chronic releases at the Dehi building. Peter Campbell
10/9/2015 Report or Workplan Review - Other Review 2014 Soil and Groundwater Investigation Report. Nine soil borings were drilled to 25 feet. Five of the borings had groundwater samples with a Geoprobe sampler. Two of the groundwater samples had diesel range hydrocarbons at 1.77 and 2.38 mg/L. The direction of groundwater flow was not determined. The extent of contamination was not delineated. Contaminants appear to originate on the north side of the Dehydration Building. No delineation of contamination has been conducted to the south. Peter Campbell

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details

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