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California Water Company Records indicate that there are nooundwater supply wells <br /> � PP Y <br /> within a mule of the site State Water Resources Control Board records show that water wells <br /> are (or were) present 1n 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 /> Ibeneath 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 supplies <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 /> IThe 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 /> soul 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 upgraduent 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 (downgraduent) and <br />' MW-1 (upgraduent) <br /> I 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 /> Iduring four consecutive quarterly sampling events, revealed no detectable petroleum <br /> hydrocarbons <br /> MZ/05-19-94/UST/94-0067 nbr 1-2 <br />