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tCalifornia Water Company Records indicate that there are no groundwater supply wells <br /> within a mile of the site. State Water Resources Control Board records show that water wells <br /> are (or were) present in the state hospital properties located approximately 2,000 feet <br /> northeast of the site. Water wells also occur approximately 2,000 feet to the east of the site. <br /> San Joaquin County, as well as state records, indicate that groundwater flows northeastward <br /> beneath the site and occurs at about 40-50 feet below surface. <br /> Pacific Bell facility UE042 presently contains one 25,000-gallon diesel UST which supplys <br /> fuel to stand by generators. <br /> 1.3 Site History <br /> The county and city have few records of the site. The site had been owned by AT&T from <br />' the mid-1940's until 1963 when a grant deed was issued to Pacific Bell. <br />' The vent and fill lines for two diesel USTs (300 gallon and 550 gallon) were removed and <br /> disposed by IT representatives in May 1990. Several borings were hand bored beneath the <br /> tanks in June 1990 and total petroleum hydrocarbons expressed as diesel were found in the <br /> soil as high as 22,000 ppm. In December 1990, the two diesel UST's (located beneath the <br /> basement floor in the center of the facility) were closed in place by rinsing the tanks and <br /> filling with a cement slurry (Figure 3). <br />' In December 1991, IT installed three monitoring wells in the streets around the site. In the <br /> soil samples analyzed, no total petroleum hydrocarbons as diesel, was observed; however, in <br />' the upgradient boring (MW-3} TPH as gasoline was observed (7.4 ppm). Benzene, toluene, <br /> ethyl benzene, xylenes (BTEX) were identified in soil samples in MW-2 (downgradient) and <br /> MW-1 (upgradient). <br /> BTEX constituents were not observed in any of the groundwater samples collected during the <br /> initial sampling; however, the groundwater samples from MW-1 and MW-2 contained 130 <br /> ppb and 52 ppb TPH as diesel, respectively. Analysis of groundwater samples, collected <br /> during four consecutive quarterly sampling events, revealed no detectable petroleum <br /> hydrocarbons. <br /> MZ/05-19-94/UST/94-0062.nbr 1-2 <br />