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13 Sofl Qualify Data <br /> In June 1990, two diesel UST's (300 gallon and 550 gallon) located beneath the on-site <br /> building were closed in place by removing all product, triple rinsing, pumping of rinsate, and <br /> filling with cement slurry Four soil borings (SSI, SS2, SS3, and SS4) were hand bored <br /> beneath the building near the abandoned tanks Soil borings SSI and SS4 were bored near <br /> the south (fill) and northeast ends of the 550 gallon tank Analysis of soil samples collected <br /> at 7 5 feet and 10 5 feet below the basement floor from boring SS1, revealed diesel <br /> concentrations of 990 ppm and 870 ppm respectively Analysis of soil samples collected <br /> from boring SS4 at 7.5 feet and 10.5 feet below the basement floor (bbf) revealed no <br /> detectable diesel concentrations <br />' Soil borings SS2 and SS3 were bored near the northeast and northwest (fill) ends of the 300 <br /> gallon tank Analysis of soil samples collected at 6 9 feet and 9.9 feet bbf revealed diesel <br /> concentrations of 13,000 ppm and 12,000 ppm respectively Analysis of soil samples <br /> collected from boring SS3 at 8 3 feet and 9 9 feet bbf revealed diesel concentrations of 17,000 <br /> ppm and 22,000 ppm <br /> Recent drilling efforts were positioned so as to examine current soil quality in areas <br /> previously observed to contain petroleum hydrocarbon concentrations. Recent boreholes VW- <br /> 1, VW-2 and VW-3 were positioned adjacent to the original boreholes SS2, SSI and SS3 <br /> respectively. Upon analysis, two of the three samples collected from soil boring VW-1 and <br /> one of the two samples collected from boring VW-3 were found to contain detectable volatile <br /> petroleum hydrocarbons (BTEX) Total BTEX concentrations ranged from 0.008 ppm to <br /> 0.025 ppm Two of the three samples collected from borehole VW-1 and both of the samples <br /> from borehole VW-3 contained the detectable diesel concentrations of 14,000 ppm and 21,000 <br /> ppm 1n VW-I and 8,500 ppm and 11,000 ppm 1n VW-3. <br /> One 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 /> of petroleum hydrocarbons 1n all three boreholes at 21 ppm, 0 15 ppm and 21 ppm in VW-1, <br /> VW-2 and VW-3 respectively. <br /> One sample collected from boring VW-3 was additionally analyzed for total organic matter. <br /> Analysis revealed the sample contained 0.63% organic matter One sample from boring <br /> NM09-06-94/UST/940138 mer 7 <br />