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Description
The former Lucky Sourdough gasoline service station site is located on the southwest corner of the intersection of Fourth Avenue and Barnette Street in Fairbanks, Alaska. The Fairbanks North Star Borough Planning Department classifies the lot as “High Density Core Area” for commercial development purposes. Significant petroleum soil contamination was initially identified by the City of Fairbanks during an excavation in 1986. Two 1,000-gallon underground storage tanks (UST's) were tested and appeared to be leaking. The service station was closed at the end of October 1986. The UST's were removed in 1992. Sampling data indicated that significant concentrations of petroleum hydrocarbons remained in the soil and groundwater, and that contamination had migrated beneath the building into inaccessible areas. The facility continues to receive grants through the State of Alaska Financial Assistance Program to fund cleanup activities.
Public Health and Environmental Concerns
The contaminants of concern (COC’s) are primarily petroleum: gasoline and gasoline components (BTEX). Gasoline-contaminated soil remains on-site and primarily in the smear zone and beneath the building. Extensive impacts to the groundwater have been identified both on and off-site, and the extent of a contaminant plume that has migrated offsite has been delineated.
Current Status
An Air Sparge/Soil Vapor Extraction (AS/SVE) system was installed and began operation in June 1996. The system was expanded in 1999 to more effectively remediate the impacted soils that remained in place. A new Dual Phase Extraction (DPE) system was installed in August 2002 and was operated through November 2002. Continued DPE operation and long term monitoring (LTM) is required. A monitoring program is in place to continually track groundwater concentrations both on and offsite, to ensure stability and to follow groundwater concentration trends over time.
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