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2.0 SITE BACKGROUND The following sections present the site description and summarize previous characterization work at the site. Copies of pertinent background documents, such as the "Notice of Responsibility," "Application for Permit to Close," PHS/EHD "Tank Inspection Report," the tank removal contractor's notes, and the analytical laboratory results of samples collected I during the tank removal were included in Appendix A of the Work Plan (B&R, 1998). _! 2.1. SITE DESCRIPTION The site is located in the southeast portion of the Port of Stockton complex, about 150 feet north of Port Road M, and about 250 feet east of Port Road 21. The site is identified by PHS/EHD as "Site Code 1237."- The site is located between two northeast-trending railroad spur tracks, and adjacent to a metal-sided office building (Figure 2). The site had four 12,000 gallon USTs(PHS/EHD ID#39-1237-01 through: -04). According to the PHS/EHD inspection reports, two of the tanks (No.'s 1 and 2) contained regular gasoline, while the remaining two tanks contained unleaded gasoline. Product pipelines ran west from the tanks for approximately 140 feet, then turned south and ran approximately 50 feet along the west side of the building to a dispenser island (Figure 2). The Applications for Permit to Operate (B&R, 1998, Appendix A) indicate that the four USTs were installed in 1975. The tanks were removed on May 11, 1989 by Thorpe Oil, Inc. (Thorpe), under permit from " PHS/EHD. The PHS/EHD inspection reports indicated that the tanks were constructed of steel and were in "good" condition, with no visible holes. Approximately 50 yards of soil were excavated with the tanks to a depth of about 11 feet below ground surface (bgs). Soil samples were collected by Thorpe from twelve locations beneath the tanks (3 samples per tank collected from beneath each end and the middle of each tank) at depths of 14 feet bgs. No groundwater was encountered during excavation or sampling. Soils beneath the tanks were reported by PHS/EHD to be "clay loam" or "sandy clay loam." Slight petroleum product odors were detected from samples collected along the east side of Tanks #1 and #2, and from each of the samples collected beneath Tank #4. ` The product pipelines were removed by Thorpe on July 10, 1989. The PHS/EHD inspection i report indicated that the piping condition was "good" although the pipes were described as "rusted." A total of 9 soil samples were collected by Thorpe about every 20 linear feet along the pipeline at a depth of approximately 3 feet bgs. Soils beneath the dispenser were also sampled. Soils beneath the pipeline and dispenser were described by PHS/EHD as "loam and rock," "red," "black," and "gray clay," and "adobe clay with sand." Gray discolored soil 2 98117UNVRFT WUST1MV.RPr 1