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0 025 ppm Two of the three samples collected from borehole VW-I and both of the samples <br /> from borehole VW-3 contained the detectable diesel concentrations of 14,000 ppm and 21,000 <br /> Ippm in VW-1 and 8,500 ppm and 11,000 ppm in VW-3 <br /> IOne sample from each borehole was analyzed to determine the soluble threshold limit <br /> concentration of diesel Analysis of the samples revealed leachable (mobile) concentrations <br /> I of petroleum hydrocarbons in all three boreholes at 21 ppm, 0 15 ppm and 21 ppm in VW-1, <br /> VW-2 and VW-3, respectively <br /> IOne sample collected from boring VW-3 was analyzed for total organic matter Analysis <br /> revealed the sample contained 0 63% organic matter One sample from boring <br /> VW-1 was additionally analyzed for reactivity, corrosivity, and ignitability to facilitate <br /> disposal The sample was found to be non-reactive, non-ignitable, and had a pH of 7 85 A <br /> Isummary of basement soil sample analytical results are depicted in Figure 6 and listed in <br /> Table 1 <br /> 6.2 Summary of Sidewalk Area Soil Sample Analytical Data <br /> In November 1993, three 25,000-gallon diesel USTs were removed from beneath the Lindsay <br /> Street sidewalk Analysis of verification soil samples collected November 10, 1993 revealed <br /> the presence of 2,900 ppm diesel in the sample collected at the west end of the middle tank <br /> (approximately 15 feet below grade) No detectable diesel or BTEX concentrations were <br /> encountered in the eight remaining verification samples <br /> I <br /> The area was over excavated to 17 5 feet below grade and 10 verification samples were <br /> collected on November 11, 1993 Analysis of these samples revealed diesel concentrations in <br /> the north (8,200 ppm and 3,300 ppm) and south (16,000 ppm) limits of the newly excavated <br /> area Two of the verification samples were collected at approximately 20 feet below grade <br /> Analysis of these samples revealed a significant decrease in diesel concentrations (from 8,200 <br /> ppm to 820 ppm - north sample and from 16,000 ppm to 21 ppm - south sample) <br /> I <br /> A third round of verification soil samples was collected on November 17, 1993. Analysis of <br /> Ithese samples revealed no detectable diesel concentrations at 20 feet below grade at the <br /> southern extent of the overexcavated area Analysis of samples collected from the northern <br /> extent of the overexcavated area revealed detectable diesel concentrations at 20 feet below <br /> MZ/04-06-95/UST/95-0089 6 <br />