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Description
The
Badger Chevron site is located at mile 0.5 of Badger
Road in North Pole, Alaska. The
site is currently operating as a Tesoro retail fuel
sales and service station. Six underground storage tanks (USTs) were originally
present on-site: (1) 500-gallon waste oil tank, (2)
unused 10,000 gallon tank, (3) 2,000-gallon unleaded
gasoline tank, (4) 2,000-gallon diesel tank, (5)
4,000-gallon regular gasoline tank, and (6) 8,000-gallon
unleaded gasoline tank. In 1992 line tightness testing
was performed. The line to the 2,000-gallon gasoline
tank failed. In October of 1993, three of the USTs
were excavated and removed; the 500-gallon waste
oil tank, the unused 10,000-gallon tank and the 2,000-gallon
gasoline tank. In September-October 1995, the remaining
three USTs were excavated and removed, along with
associated piping, dispenser pumps and island. Extensive
soil and groundwater contamination was identified
during the 1995 removal action.
Following
the removal action, a new 5,000-gallon, double walled
AST was
installed with new pumps, dispenser island, total
containment piping, and a leak detection
system. A 12,000-gallon tri-compartment UST was
installed in July 1996, replacing the 5,000-gallon
AST. Approximately
840-cubic yards of petroleum contaminated soils
were excavated and stockpiled on-site during the 1993
and 1995 tank removal activities. A site assessment
was performed in 1995 and reviewed/rewritten in 1996.
A release investigation was performed in 2001 to
determine the nature and extent of soil and groundwater
contamination. Included as part of the investigation
were drinking water sampling, groundwater sampling,
and segregation and treatment of the stockpiled soil.
Stockpile segregation, sampling, excavation and removal
took place during 2001 and 2002. A total of 721.1
tons of petroleum contaminated soil was transported
off-site and thermally remediated.
In 2003 a soil vapor extraction system was installed at the site as an interim cleanup action. The system actively removes volatile contaminants from the subsurface by pulling out the vapors from the soil. Additional groundwater and drinking water well samples were also collected to monitor water quality in this area. 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 (COCs) are primarily petroleum; diesel, gasoline and gasoline components (BTEX). Chlorinated solvents from an unknown source have also been identified during drinking water and groundwater sampling. Petroleum contaminated soil is remains on-site. Extensive impacts to the groundwater have been identified both on and off-site.
Current Status
Further assessment work is required to completely characterize the site. A soil vapor extraction system was installed in the fall of 2003 and remains operational.
More Information
Badger Chevron (PDF 427K) well sampling results, November 2002
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