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5. Xylene . 15/106 x 56lbs/ft3 x 150,OOOft3 = 1.26 pounds <br /> b. Final Mass Contaminants = Concentration x density x volume <br /> 1. TPHG 68/106 x 43lbs/ft3 x 150,OOOft3 = 439 pounds <br /> 2. Benzene . 14/106 x 56lbs/ft3 x 150,OOOft3 = 1.2 pounds <br /> 3. Toluene .09/106 x 56lbs/ft3 x 150,OOOft3 = 0. 76 pounds <br /> 4. Ethyl B 0.38/106 x 56lbs/ft3 x 150,OOOft3 = 3. 2 pounds <br /> 5. Xylene 0.08/106 x 56lbs/ft3 x 150,OOOft3 = . 67 pounds <br /> 1. GROUNDWATER <br /> a Original Mass Contaminants = Concentration x density x <br /> volume <br /> 1. TPHG . 35/106 x 43lbs/ft3 x 2700ft3 = 0 .04 pounds <br /> 2. Benzene . 1/106 x 56lbs/ft3 x 2700ft3 = 0.02 pounds <br /> 3. Toluene 0 . 11/106 x 56lbs/ft3 x 2700ft3 = 0.002 pounds <br /> 4. Ethyl B 0 .09/106 x 56lbs/ft3 x 2700ft3 = 0.014 pounds <br /> S. Xylene 0 .038/106 x 561bs/ft3 x 2700ft3 = 0.006 pounds <br /> 6. MTBE 0.003/106 x 44lbs/ft3 x 2700ft3 = 0.0004 pounds <br /> b Final Mass Contaminants = Concentration x density x volume <br /> 1. TPHG 0.0/106 x 43lbs/ft3 x 2700ft3 = 0.0 pounds <br /> 2. Benzene 0 .003/106 x 56lbs/ft3 x 2700ft3 = 0.0005 pounds <br /> 3. Toluene 0.0/106 x 56lbs/ft3 x 2700ft3 = 0.0 pounds <br /> 4. Ethyl B 0.0005/106 x 56lbs/ft3 x 2700ft3 = 0.00008 pounds <br /> 5. Xylene 0.00005/106 x 561bs/ft3 x 2700ft3 = 0.000008 pounds <br /> 6. MTBE 0.0022/106 x 44lbs/ft3 x 2700ft3 = 0.0003 pounds <br /> 12 <br />