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iPacific Bell facility UE042 presently contains one 25,000-gallon diesel UST which supplies <br /> fuel to standby 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 />' In February 1993, IT installed six off-site soil borings to examine the extent of petroleum <br /> hydrocarbon migration from the site. Analysis of soil samples from these boreholes revealed <br /> no detectable petroleum hydrocarbons. Analysis of groundwater samples, collected from the <br /> boreholes, revealed no detectable diesel concentrations. No detectable volatile hydrocarbons <br /> were encountered in the groundwater samples collected from borings SB-1 through SB-4 and <br />' SB-6 upon analysis The water sample collected from SB-5 revealed 0 8 ppb toluene only, <br /> upon analysis. <br /> i <br /> MZ/09-W94/UST/94-0138 mer 2 <br /> i <br />