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- ,. 150 , 000 ft3. <br /> ;y;C,45 <br /> A. WATER <br /> 1. VERTICAL DISTRIBUTION <br /> Based on the work reported by JPCA, the reported hydrocarbon <br /> contamination in the groundwater was detected between <br /> approximately ten and twenty feet below surface level, the <br /> aquifer is approximately 95% solids. <br /> 5 0 <br /> 2 . LATERAL DISTRIBUTION <br /> The area outlined in Figure 6 for groundwater contamination is <br /> approximately 5, 400 ftz. <br /> The calculated volume of the contaminated groundwater aquifer is <br /> approximately 54, 000 ft3. The groundwater volume is <br /> approximately 2 , 700 ft3. <br /> 8 . TECHNOLOGY USED TO CLEAN SITE <br /> Because only minor concentrations of hydrocarbon contamination <br /> were found in the soil and groundwater at the subject site, it <br /> was our judgement that natural attenuation by bioremediation was <br /> the least pervasive, most logical and efficient method for the <br /> remediation of this site. <br /> 9 . MASS BALANCE CALCULATIONS <br /> A. ASSUMPTIONS AND RATIONAL <br /> 1 . The hydrocarbon contamination found on the subject property <br /> originated from and at the former UST. <br /> 2 . The calculated volume of contaminated soil is approximately <br /> 150, 000 ft3. <br /> 3 . The contaminated water appears to be in the shallow aquifer <br /> and not used for human consumption, the aquifer is approximately <br /> 95% solids. The calculated groundwater volume is approximately <br /> 2 , 700 ft3. <br /> > 9 <br />