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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 /> 244, 500 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 /> 7, 900 ft3. <br /> 4 . The values in Table A listed below are used for contamination <br /> calculations . <br /> TABLE A <br /> MATERIAL DENSITY POUNDS/GALLON POUNDS/FOOT' <br /> Gasoline 0 . 732 6 . 10 43 . 0 <br /> Benzene 0 . 879 7 . 32 56 .0 <br /> Toluene 0 . 866 7 . 20 56 . 0 <br /> Ethylbenzene 0 . 867 7 . 21 56 .0 <br /> Xylene 0 . 860 7. 18 56 .0 <br /> MTBE 0 . 740 6 . 18 44 . 0 <br /> 5 . The contamination concentrations approximate a straight line <br /> from the highest reported concentration at the former UST pit to <br /> the Non detected concentration limits noted in Figure 5 for soil <br /> and Figure 6 for groundwater <br /> 10 <br />