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Site Report: Alyeska PS 01 Solar Generator


Site Name: Alyeska PS 01 Solar Generator
Address: Spine Road, Pipeline Mile 0, Deadhorse, AK 99734
File Number: 330.38.095
Hazard ID: 3708
Status: Active
Staff: Grant Lidren, 9072698685 grant.lidren@alaska.gov
Latitude: 70.257472
Longitude: -148.618995
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

On August 10, 2000, a fuel leak associated with the solar generator fuel piping and day tank was discovered. An estimated 25 gallons of turbine fuel was released into the surrounding gravel pad. Approximately 90 cubic yards of contaminated soil was removed from the excavation and stockpiled at PS1 according to the Linewide Stockpile Management Plan. No documentation of excavation confirmation samples. Three soil borings were advanced parallel to the south wall of the Control Building. DRO was detected in two of the three soil borings at 2,920 ppm and 3,510 ppm at 3 to 6 feet below ground surface. Gravel pad location is parallel to the south wall of the Control Building (Generator Building). File nos. 330.38.095. 330.38.107, and 330.38.110 are being monitored and reported together under 330.38.107.

Action Information

Action Date Action Description DEC Staff
1/17/2001 Update or Other Action 2000 Soil Sampling Report, PS 1 Generator Building Contamination Assessment Alyeska Spill Number 2000049 was submitted to ADEC. DRO was detected in SB2 and SB3 at 2,920 ppm and 3,510 ppm respectively. Sample results results from SB2 and SB3 confirm that contamination was present at 3 to 6 feet below ground surface. IT recommends additional site characterization in the summer 2001 to delineate the extent of soil contamination in the area of the primary generator and address the migration to surface water pathway for this site. Deborah Williams
1/22/2001 Site Added to Database Turbine fuel spill. Bruce Wanstall
1/22/2001 Site Ranked Using the AHRM Preliminary ranking. Deborah Williams
8/6/2001 Site Characterization Workplan Approved Approval to conduct a subsurface assessment at the generator area. Renee Evans
4/3/2002 Update or Other Action Received Contamination Assessment Report for Solar Generator Area. Wells installed in test pits excavated with a vac truck. Groundwater and soil sampled. Highest contaminant concentrations found in groundwater and soil in the vicinity of MW-4 and MW-8 (18.6 and 56 mg/L DRO and 0.0173 and 0.0117 mg/L benzene respectively for groundwater) suggesting source may have been the former fuel tank and containment area adjacent to the generator shed. SLR recommended annual groundwater monitoring. Soil concentrations not above Ingestion/Inhalation/Direct Contact for Arctic Zone. Keather McLoone
4/9/2003 Update or Other Action Received Solar Generator Groundwater Monitoring report. Another well installed and groundwater sampled for DRO, BTEX, and PAHs. MW-8 sampled for full list SVOCs and glycols also. Benzene and DRO above groundwater cleanup levels in four wells. Some concentrations higher than in 2001 and some lower. Groundwater flow appears to be SSW. Keather McLoone
5/1/2003 Update or Other Action Received Solar Generator Monitoring Workplan Keather McLoone
3/30/2004 Update or Other Action ADEC received SLR's report on 2003 Pump Station 1 Solar Generator Groundwater Monitoring Report. Benzene and DRO were detected in concentrations exceeding ADEC groundwater cleanup levels from monitoring wells at the source and downgradient of the Solar Generator. Because of the detection of CFCs and chlorinated organic compounds in the sample from B-MW-10, SLR recommends sampling monitoring wells B-MW-10, MW-8, B-MW-GB and B-MW-8 for volatile organic compounds in order to help determine the extent and distribution of these compounds. Glycols were no longer detected in samples collected near the Generator, and are believed to have a short residence time in water. SLR recommends discontinuing laboratory analysis for glycols. Deborah Williams
3/15/2005 Update or Other Action ADEC received SLR's PS1 Solar Generator 2004 Groundwater Monitoring Report. According to the report, concentrations of benzene and DRO in groundwater samples collected from the source area and downgradient of the source exceeded ADEC groundwater cleanup levels. DRO exceedances were found in MW-1, MW-10, B-MW-8, and B-MW-10. The lateral extent of benzene-impacted groundwater appears to encompass a similar area as the DRO plume. Deborah Williams
6/28/2006 Update or Other Action The Solar Generator, Gas Building, and Gas Compressor Building sites have overlapping groundwater contamination. Therefore, the monitoring for this site will be considered a part of the PS 1 West Pad site which is found in 330.38.107. Deborah Williams
3/14/2007 Update or Other Action Future monitoring of these wells will be handled under a combined report called PS 1 2006 West Pad Ground Water Monitoring Report (file number 330.38.107). Deborah Williams
1/3/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Keather McLoone
11/2/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 74683 turbine fuel/day tank. Keather McLoone

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details

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