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Site Report: Bernice Lake Power Plant


Site Name: Bernice Lake Power Plant
Address: 55244 Chevron Road, Nikiski, AK 99635
File Number: 2323.38.054
Hazard ID: 25878
Status: Cleanup Complete
Staff: ,
Latitude: 60.693639
Longitude: -151.387743
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 initial investigation conducted May 1, 2012 for a property transfer, diesel range organics was detected at one foot below ground surface at 644 mg/kg and at two feet below ground surface at 3,310 mg/kg in the samples collected next to transformer TRF-116. The oil release was determined to be from oil leaking from seals on the transformer. PCBs was also deteceted at 0.052 mg/kg at one foot below ground surface and 0.0813 mg/kg at two feet below ground surface next to the transformer.

Action Information

Action Date Action Description DEC Staff
6/6/2012 Site Added to Database A new site has been added to the database Alyce Hughey
6/6/2012 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79292 name: Transformer TRF-116 Alyce Hughey
6/19/2012 Report or Workplan Review - Other Approved Work Plan for Cleanup of Mineral Oil Spill at Bernice Lake Power Plant received June 5. Field work to take place June 21. Peter Campbell
9/21/2012 Conceptual Site Model Submitted Conceptual Site Model submitted with the Final Report for Cleanup of Mineral Oil Spill at Bernice Lake Power Plant report, dated August 2012, prepared by Restoration Science & Engineering. Alyce Hughey
9/21/2012 Final Cleanup Report Reviewed Reviewed the Final Report for Cleanup of Mineral Oil Spill at Bernice Lake Power Plant, dated August 2012, prepared by Restoration Science & Engineering. On June 25, 2012 a total of 97.62 tons of contaminated soil was excavated from the former area of transformer TRF-116 location. Soil samples analyzed from the stockpile indicated that the soils were acceptable for disposal at the Kenai Peninsula Borough Landfill, and transported on August 3, 2012 for disposal. Confirmation soil analytical results taken within the excavation limits were non-detect for DRO, RRO and PCBs at depths of 7 to 8 feet below ground surface. A composite grid sample was collected to determine if historic PCB track-out represented an issue. Analytical results showed 0.139 mg/kg PCBs at a depth of 0.3 feet below ground surface. The 2,703-gallons of transformer oil, was disposed of at Emerald Alaska. Alyce Hughey
10/2/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79292 Transformer TRF-116. Alyce Hughey
10/19/2012 Cleanup Complete Determination Issued Cleanup Complete Determination Issued. Following the completion of remedial actions performed at this site from 2011 to 2012, residual soil contamination has not been reported to remain at this site exceeding the ADEC's Method Two Migration to Groundwater soil cleanup levels at depths exceeding eight feet below ground surface. ADEC has determined there is no unacceptable risk to human health or the environment. Groundwater which has been reported at a depth of 55 feet below ground surface, was not encountered and has not been affected by this transformer oil release. This property and adjacent developed properties use groundwater for drinking water and potable water. No municipal public water system is currently available in this locale. Althogh a Cleanup Complete determination is being granted, ADEC approval is required for off-site soil disposal of soils located in the area of the former transformer TRF-116. If future information indicates that this site may pose an unacceptable risk to human health or the environment, ADEC will require additional assessment and/or cleanup action. Peter Campbell

Contaminant Information

Name Level Description Media Comments
DRO < Method 2 Most Stringent Soil
Aroclor 1260 < Method 2 Most Stringent Soil

Control Type

Type Details
No ICs Required

Requirements

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

Missing Location Data

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