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Site Report: Alyeska PS 08 Former Fire Training Area


Site Name: Alyeska PS 08 Former Fire Training Area
Address: 7945 Johnson Road; Pump Station 8; Off MP 330 Richardson Highway, Salcha, AK 99714
File Number: 330.38.124
Hazard ID: 26205
Status: Active
Staff: Grant Lidren, 9072698685 grant.lidren@alaska.gov
Latitude: 64.540037
Longitude: -146.830806
Horizontal Datum:NAD83

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

In 2012, the former fire training area at Alyeska pump station 8 was decommissioned and regraded. As part of the removal, the 10 foot by 10 foot concrete slab, used as a base for firefighting props during training excersises, was excavated and removed. In 2013, 19 testpits excavated to a depth of 1.0 to 1.5 feet below ground surface contained diesel range organics up to 3,690 mg/kg. Test pit 11 contained a strong hydrocarbon odor and test pit 3 contained a black-stained soil layer. A black liner was observed in test pit 10.

Action Information

Action Date Action Description DEC Staff
2/12/2014 Site Added to Database A new site has been added to the database Mitzi Read
2/13/2014 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79606 name: Former Fire Training Area Mitzi Read
5/22/2014 Update or Other Action ADEC approved the Fire Training Area 2014 Remediation Work Plan for Pump Station 8 submitted by SLR, dated April 2014 with one condition; the stockpile must be segregated. Grant Lidren
7/7/2014 Offsite Soil or Groundwater Disposal Approved On this date, approved up to 50 cy of petroleum impacted soil to be transported to OIT in North Pole. Grant Lidren
2/12/2015 Site Characterization Report Approved On this date, ADEC received the Remediation Report 2014 Pump Station 8 Fire Training Area submitted by SLR dated January 2015. Prior to soil removal, three soil samples were collected from the area most suspected of contamination and analyzed for PFOA and PFOS. The soil samples contained detectable levels of PFOA and PFOS, but below the most stringent MTG draft cleanup levels. Contaminated soil was excavated in areas identified as contaminated in 2013. Several plastic liners and metal debris were encountered during excavating of 90 cy of contaminated soil in July. A total of 11 soil samples were collected from the excavation sidewalls and bottom and analyzed for DRO and RRO. Soil samples collected from the bottom did not contain contaminant concentrations above the most stringent MTG cleanup levels. Three soil samples collected from the sidewalls contained DRO concentrations of 285 mg/kg, 473 mg/kg, and 1,510 mg/kg. Based off these results, excavating was commenced again in August. The open excavation contained free standing water with a thick film of green algae. A dewatering drainage ditch was dug to dewater prior to excavation activities. An additional 30 cy of contaminated soil was removed and additional liners with petroleum hydrocarbon odors were observed. Two soil samples collected from an excavation sidewall were below the most stringent MTG cleanup levels. A test trench advanced 19 feet to the east to determine the extent of the liners contained petroleum impacted soils. Additional excavation activities are planned for 2015. A total of 120 cy of contaminated soil was transported to OIT for thermal treatment in 2014. Metal debris was disposed offsite. Grant Lidren
5/29/2015 Site Characterization Report Approved On this date, ADEC received the PS08 Fire Training Area 2015 Remediation Work Plan submitted by SLR dated May 2015. Grant Lidren
3/29/2016 Site Characterization Report Approved On this date, ADEC received the Remediation Report 2015 Pump Station 8 Fire Training Area submitted by SLR dated March 2016. Several plastic liners, charred wood, glass bottles, and metal debris were encountered during excavating of 160 cy of contaminated soil. A total of 16 soil samples, analyzed for DRO, were collected from the five excavation sidewalls, excavation bedrock bottom, and from testpits north of the excavation. Soil samples collected from the bedrock bottom did not contain DRO concentrations above the most stringent MTG cleanup levels. Two of the five sidewalls, located at the north western side of the excavation, contained DRO concentrations of 871 mg/kg, and 597 mg/kg. Soil samples collected from three of the six test pits locate north of the north western sidewall contained DRO at 1,740 mg/kg, 582 mg/kg, and 467 mg/kg. A total of 160 cy of contaminated soil was transported to OIT for thermal treatment in 2015. Metal debris was disposed offsite. Additional excavation activities are planned for 2016. Grant Lidren
6/6/2016 Site Characterization Workplan Approved The Alaska Department of Environmental Conservation (ADEC) Contaminated Sites Program (CSP) has received and reviewed the Pump Station 8 Fire Training Area 2016 Remediation Work Plan submitted by SLR and dated May 2016. ADEC has no objections to the Work Plan and SLR may proceed. Grant Lidren
7/5/2016 Offsite Soil or Groundwater Disposal Approved On this date, ADEC approved the transport of up to 150 cy of stockpiled soil - generated from 2014 and 2015 excavations - to OIT Grant Lidren
2/15/2017 Risk Assessment Report Approved On this date, ADEC received the 2016 Remediation Report for Pump Station 8 Fire Training Area submitted by SLR dated January 2017. Buried building materials, liners, charred wood, and metal debris were encountered during excavating of 205 cy of contaminated soil. A total of 14 soil samples, analyzed for DRO, were collected from the five excavation sidewalls and excavation bedrock bottom. One out of seven soil samples collected from the bedrock bottom contained DRO above cleanup levels at 408 mg/kg. One of the six sidewalls samples, collected from the north sidewall, contained DRO above cleanup levels at 304 mg/kg. A total of 205 cy (276 tons) of contaminated soil was transported to OIT for thermal treatment in 2015. Metal debris was disposed offsite. The excavation was backfilled with clean fill. Grant Lidren

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

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Description Details

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