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HWAAP-B26
BUILDING 103-6 POL PIT
SITE DESCRIPTION
HWAAP-B26 is an inactive unlined surface impoundment located north of Building 103-6. The impoundment measures 25-ft x 85-ft x 8-ft. The impoundment operated  from the 1940s to 1980s and received steam line blowdown water, fuel oil, crude oil and other waste petroleum, oil, and lubricants (POL) products. There is visible evidence of POL-stained soils in and around the pit. In 1992 the impoundment was backfilled with soil to almost grade level. The pit is currently characterized by a depressed area approximately twice as large as the originally reported size of the impoundment. Remedial investigation work in 1994 included surface soil and hand auger sampling and cone penetrometer soundings. Two hand auger samples and two cone penetrometer soil samples were collected from within the pit and analyzed for explosives, metals, SVOCs, VOCs, PCBs, and TPH. All groups of chemicals were detected in the surface and subsurface soil. 16,000 mg/kg of TPH-D and 120 mg/kg of TNT were detected in one sample at 6 to 6.5 feet below ground surface (bgs) and 0.17 mg/kg of TNT was detected at a depth of 5 feet bgs. There are no known groundwater issues at this site. Estimated depth to groundwater is 95 feet bgs.
PROPOSED PLAN
Additional investigation was conducted in July 2010 to determine the extent of TPH-diesel and TPH-Bunker C in soil and groundwater. Results of the investigation have not been submitted as of September 2010.
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