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Working To Restore Nature 1710 Main Street Escalon, CA 95320 Phone: (209) 838-3507 FAX: (209) 838-3509 FILE June 3, 1993 Ms. Diane Hinson San Joaquin County Public Health Services Environmental Health Division P.O. Box 2009 Stockton, CA 95201 RE: Soil Excavation Report, Nor-Cal Beverage Co., Inc., 1800 E. Fremont St., Stockton, California Dear Ms. Hinson: The attached report describes the soil excavation and sampling conducted at the above referenced site (Figure 1). The scope of the work is based upon the findings from previous investigations. Due to the fact that petroleum hydrocarbon contamination was left in place during tank removal and subsequent initial excavation, RESNA Industries (RESNA), on behalf of Nor-Cal Beverage, removed the remaining petroleum hydrocarbon impacted soil. SITE BACKGROUND The site was the location of three underground fuel storage tanks. The tanks, which were used to store leaded and unleaded gasoline and possibly diesel, were removed in January 1991. During tank removal, field evidence and subsequent laboratory analyses indicated the presence of petroleum hydrocarbon constituents in the soils within the tank excavation. Locations of the former tanks and soil samples are shown in Figure 2. Analytical results are summarized in Table 1. Source removal excavation was conducted in March 1991. Fourteen verification samples were collected and the excavation was backfilled. Soil samples were analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX), total petroleum hydrocarbons as gasoline (TPHG) and total - petroleum hydrocarbons as diesel (TPHD). Three of the samples were reported to contain elevated concentrations of analytes (Table 1). These results indicated that contamination remained near the middle of the west side of the former 10,000 gallon tank location and beneath the center of the former 500 gallon tank location. PAR-0593.FNL