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May 6, 1996 +, Page 2 Available information indicates that the original product facilities included two steel I 0,000-gallon gasoline underground storage tanks (USTs), one steel 5,000-gallon gasoline UST, one steel 1,000-gallon used oil UST, two product islands, and one floor sump associated with the lube bay The gasohne USTs contained supreme, meddle- grade, and regular gasolene These product facilities were removed in September 1995 The product facilities recently installed at the site include three double-walled fiberglass 12,000-gallon gasolene USTs, one 250-gallon above ground used oil tank, and two product islands (Figure 2) SCOPE OF WORK To detererune if petroleum hydrocarbons are present in the soil and groundwater beneath the site, the following scope of work was performed • Permits. PACIFIC obtained the appropriate soil boring and ground- water monitoring well permits from San Joaquin County prior to initiating field work 0 Soil Boring and Well Installation. Four soil borings (B-1 through . B-4) and four groundwater monitoring wells (MW-I through MW-4) were installed on January 10 and 11, 1996 The soil borings and wells were installed to investigate soil and groundwater conditions in the vicinity of the former USTs, product piping, and product islands (Figure 2) • Well Elevation Survey, Well Development, and Well Sampling. The new wells were surveyed to MSL by a state-certified surveyor The wells were developed and sampled on February 12, 1996, by PACIFIC • Soil and Groundwater Analysis. Selected soil and groundwater samples were submitted to a California State-certified laboratory and analyzed for the presence of total purgeable petroleum hydrocarbons as gasolene (TPPH-g), benzene, toluene, ethylbenzene, xylenes (BTEX compounds), total extractable petroleum hydrocarbons calculated as diesel (TEPH-d), and methyl t-Butyl ether (MTBE) i 3201591A/REPORT