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SB-1 through SB-4 and SB-6 upon analysis The water sample collected from SB-5 revealed <br /> 0 8 ppb toluene only, upon analysis <br /> In March 1993, IT submitted an "Offsite Investigation Report" to San Joaquin County Public <br /> Health Services (SJCPHS), Environmental Health Division, requesting site closure At this <br /> time, quarterly monitoring activities were halted, pending data evaluation by the regulatory <br /> agency In a letter dated June 1, 1993, SJCPHS representatives requested further investigation <br /> of soil quality beneath the site building <br /> In November 1993, three 25,000-gallon diesel USTs were removed from beneath the Lindsay <br /> Street sidewalk (adjacent to the Pacific Bell facilities north wall) by representatives of <br /> Aronson Engineering Incorporated Soil samples were collected from the excavation by <br /> representatives of Riedel Environmental Services Incorporated, which revealed detectable <br /> concentrations of diesel fuel (near the west end of the middle tank) upon analysis No <br /> detectable BTEX constituents were encountered in any of the samples <br /> Over excavation efforts were conducted on November 11, 1993 which extended the <br />. excavation to 17 5 feet below grade A senes of confirmatory soil samples were collected <br /> from the excavation Upon analysis, detectable diesel concentrations (up to 8,300 ppm) were <br /> encountered between 17 5 and 27 5 feet below grade near the west end of the middle tank <br /> No detectable BTEX concentrations were encountered <br /> Drilling efforts in July 1994 were positioned so as to examine current soil quality in the <br /> sidewalk area previously observed to contain detectable petroleum hydrocarbons (Figure 3) <br /> Analysis of these samples revealed no detectable BTEX concentrations No detectable diesel <br /> concentrations were encountered in the samples collected from borehole VW-A Diesel was <br /> encountered in the samples collected from borehole VW-B at 22 5 and 25 0 feet below grade <br /> only (110 ppm and 2 1 ppm, respectively) <br /> Additional drilling efforts in July 1994 were continued in the basement area. Three <br /> boreholes, VW-1, VW-2, and VW-3, were positioned adjacent to the original boreholes, SS2, <br /> SSI, and SS3, respectively Two of the three samples collected from borehole VW-1 and <br /> both of the samples from borehole VW-3 contained the detectable diesel concentrations of <br /> 14,000 ppm and 21,000 ppm in VW-1 and 8,500 ppm and 11,000 ppm in VW-3 <br /> MZJ04-06-95/UST/95-0089 3 <br />