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'J <br /> Based on the work reported by SMITH and JPCA, the reported <br /> hydrocarbon contamination in the groundwater was detected between <br /> approximately ten and twenty feet below surface level, the <br /> aquifer is approximately 95% solids. <br /> 2. LATERAL DISTRIBUTION <br /> The area outlined in Figure 6 for groundwater contamination is <br /> approximately 5, 400 ft2. <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 /> S. 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 /> 4. The values in Table A listed below are used for contamination <br /> calculations. <br /> TABLE A <br /> 9 <br />