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AAFAM <br /> Frr ,RaF <br /> v C C-'�' r"' <br /> J 1 # Working To Restore Nature <br /> 1710 Main Street 93' 0EC 23 PM 2: 5 f <br /> Escalon, CA 95320 <br /> Phone: (209) 838-3507 <br /> FAX: (209) 838-3509 <br /> December 20, 1993 <br /> Ms. Diane Hinson <br /> San Joaquin County PHS/EHD <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Subject: Nor-Cal Beverage Company, 1800 E. Fremont St., Stockton, California <br /> Dear Ms. Hinson: <br /> This letter is in response to the CRWQCB's September 22, 1.993 request for more information <br /> on the groundwater gradient and wells in the vicinity of the above referenced site (Figure 1). <br /> This report summarizes previous investigations at the site as well as data compiled from the <br /> Department of Water Resources (DWR) Central District Office, San Joaquin County Public <br /> Health Services, Environmental Health Division (PHSIEHD) records, and San Joaquin County <br /> Flood Control and Water Conservation District maps. <br /> SITE BACKGROUND <br /> The site was the location of three underground fuel storage tanks that were removed in January <br /> 1991. The tanks were used to store leaded and unleaded gasoline and possible diesel. <br /> Laboratory analysis of samples collected during tank removal indicated the presence of <br /> petroleum hydrocarbons in soils within the tank excavation (Table 1). Locations of the former <br /> tanks and soil samples are shown in Figure 2. <br /> Source removal excavation was conducted in March 1991. Confirmation samples were analyzed <br /> for benzene, toluene, ethylbenzene and xylenes (BTEX), total petroleum hydrocarbons as <br /> gasoline (TPHG) and total petroleum hydrocarbons as diesel (TPHD). Analytical results (Table <br />_ 1) indicated that contamination remained near the middle of the former 10,000 gallon tank _ <br /> location and beneath the center of the former 500 gallon tank location. <br /> In May 1991, a groundwater monitoring well (MW-1) was installed in the approximate center <br /> of the backfilled tank pit. Soil samples were collected during well installation. Analytical <br /> results are summarized in Table 1. Groundwater was encountered at approximately 69 feet <br /> L1293.FNL 1 r <br />