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IMM Mir M <br /> Mass balance calculations for Benzene in groundwater <br /> (413)*(31416) r1 * Q * r3 <br /> volume of impacted <br /> groundwater(elipsoid)= 419 * 13 * 13 * 7 25 <br /> Volume of impacted <br /> groundwater= 5,132 ft3 <br /> Average concentration of <br /> contaminant in groundwater <br /> 67 pg/L <br /> Chemical BENZENE <br /> mass= 5,132 ft' * 2832 L * 03 _ * 67 pg/ * 0000000001 kg <br /> ft3 L pg/L <br /> mass= 000029 kg <br /> mass= 000064 lbs <br /> r1 and r2 denote one half the width of contaminant zone(26 ft), r3 denotes one half of the thickness of the contaminant <br /> zone(gwt to bottom of screen=14 5ft) <br /> Average concentration equals the mean concentration of benzene in borings SB, SB2, and MW1 <br /> Assume 30% porosity <br /> i <br /> i <br />