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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 (Appendix A) indicate that the four USTs were installed in 1975. r 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 in 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 reported 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 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 and petroleum product odor were reported in the pipeline sample nearest the dispenser and in the sample beneath the dispenser itself. 2.2 SUMMARY OF PREVIOUS SITE CHARACTERIZATION WORK Soil samples collected from beneath the tanks were submitted to Canonie Environmental Laboratories for analysis of total volatile petroleum hydrocarbons (equivalent to total petroleum hydrocarbons as gasoline, TPHg) and benzene,. toluene,. ethyl benzene, and total xylenes (BTEX) by EPA Method 8015/8020; ethylene dibromide (EDB) by EPA Method 504, and organic lead by the Department of Health Services LUFT method. In addition to being analyzed for these constituents, samples from beneath the pipeline and dispenser were analyzed for total extractable hydrocarbons (equivalent to total petroleum hydrocarbons as diesel, TPHd) 2 98117MUSTINV_W M ' r