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1410/71-51-1C <br /> area of approximately 60,000 square feet, or roughly one-third of the Shop 10 facility area <br /> Because the porosity of the sal is unknown and the depth of the contaminated <br /> groundwater area is also not known, an estimate of the volume of contaminated <br /> groundwater cannot be made <br /> The presence of high diesel contamination at 1,800 mg/kg in SB 17 at 1 5 feet below <br /> grade is most likely attributable to the asphalt and asphalt emulsion used in the placement <br /> of the asphalt pavement The low level of diesel (5 3 mg/kg) detected in the soil in MW13 <br /> at 40 feet below grade is an isolated result and does not appear to have migrated from <br /> the former tank location In any case, the low level does not appear to be at a level of <br /> concern <br /> The low level of chloroform at 11 ug/L detected in MW19 is an isolated finding and <br /> appears to be a contaminant in the laboratory apparatus used in the analysis <br /> Review of laboratory QA/QC information reveal the following <br /> o Surrogate percent recoveries fall within the acceptable range of percent <br /> (ACP) of 80-120% <br /> o Matrix Spike (MS) percent recoveries fall within the ACP of 80-120%for MS <br /> o Matrix Spike Duplicate (MSD) percent recoveries fall within the ACP of 80- <br /> 120% for MSD <br /> o Relative percent differences (RPD) fall within the ACP of 0-20% for RPD <br /> These findings indicate that good quality analytical data was provided by the laboratories <br /> which conducted the chemical analyses <br /> 20 <br />