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INTERNATIONAL TECHNOLOGY CORPORATION <br /> 1.0 Introduction <br /> IT Corporation (1'T) was retained by Pacific Bell to execute the verification monitoring <br /> program proposed in the IT Corporation, Site Investigation Report, Pacific Bell, Facility No <br /> UE042, 345 North San Joaquin Street, Stockton, California, March 1992 <br /> The verification monitoring program consists of the sampling and analysis of groundwater <br /> samples collected from three off-site monitoring wells This report summanzes the quarterly <br /> monitoring event conducted during June 1992 <br /> 2.0 Site Background <br /> 1 The Pacific Bell facility located at 345 North San Joaquin Street in Stockton consists of a <br /> building which covers the entire site - half a block (Figures 1 & 2) In December 1990, two <br /> diesel UST's (300 gallon and 550 gallon) located beneath the basement floor in the center of <br /> the facility building were closed in place by filling with a cement slurry Several borings <br /> were hand bored beneath the tanks and total petroleum hydrocarbons expressed as diesel were <br /> found in the soil as high as 22,000 ppm. <br /> In December 1991 IT Corporation installed three monitoring wells the streets around the <br /> � g m <br /> site (Appendix A) In the soul samples analyzed, no total petroleum hydrocarbons as diesel, <br /> was observed, however, in the upgradnent boring, TPH as gasoline was observed (7 4 ppm) <br /> Benzene, toluene, ethyl benzene, and xylenes (BTEX) were identified in soil samples in MW- <br /> 2 (downgradient) and MW-1 (upgradient) <br /> BTEX constituents were not observed in any of the groundwater samples The groundwater <br /> samples from MW-1 and MW-2 contained 130 ppb and 52 ppb TPH as diesel, respectively <br /> (Table 3) <br /> 3. ivi i <br /> 0 Quarterly Act t es <br /> The wells were sampled and groundwater elevations recorded on June 30, 1992 (second <br /> quarterlyevent). Water-level data was collected so adient and flow direction could be <br /> �' <br /> calculated Sampling procedures conformed to California Regional Water Quality Control <br /> Board and San Joaquin County Environmental Health guidelines At least three well volumes <br /> m08-27-9Z04G/97 52.AER 1 <br />