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b. Final Mass Contaminants = Concentration x density x volume <br /> 1 . TPHG 0 . 15/106 x 43lbs/ft3 x 7900ft3 = 0. 05 pounds <br /> 2 . Benzene 0 . 003/106 x 56lbs/ft3 x 7900ft3 = 0. 0013 pounds <br /> 3 . Toluene 0 . 0003/106 x 56lbs/ft3 x 7900ft3 = 0 . 00013 pounds <br /> 4 . Ethyl B 0 . 0004/105 x 56lbs/ft3 x 7900ft3 = 0 . 00018 pounds <br /> 5 . Xylene 0 . 001/105 x 56lbs/ft3 x 7900ft3 = 0 .00004 pounds <br /> 13 <br />