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MASS BALANCE CALCULATIONS <br /> (Benzene in Groundwater) <br /> Zone 1:Volume: 38'x20'x3'=Z280 0 <br /> Pore Volume: 2,280 0 (30%porosity)=684 ft3 <br /> Benzene =760 ppb(Benzene concentration from 4/03 QM report) <br /> 684 ft3(7.48 gal/ft3)(8.328 lb H2O/gal)(760 lb Benzene/lxl09 lb H20)=0.032 lb Benzene <br /> Zone 2:Volume: 38'x24'x3'=2,736 ft3 <br /> Pore Volume: 2,736 0 (30%porosity)= 821 ft3 <br /> Benzene = 3.4 ppb(Benzene concentration from 4/03 QM report) <br /> 821 ft3(7.48 gal/ft3)(8.328 lb H2O/gal)(3.4 lb Benzene/1x109 lb H20)=0.0002 lb Benzene <br /> Zone 3:Volume: 43'x7'x3'=903 0 <br /> Pore Volume: 903 ft3 (30%porosity)=271 ft3 <br /> Benzene =760 ppb(Benzene concentration from 4/03 QM report) <br /> 271 ft3(7.48 gal/ft3)(8.328 lb H2O/gal)(760 lb Benzene/1x109 lb H20)=0.013 lb Benzene <br /> Zone 4:Volume: 39'x35'x3'=4,095 ft3 <br /> Pore Volume: 4,095 ft3 (30%porosity)= 1,229 ft3 <br /> Benzene = 382 ppb(Benzene concentration from 4/03 QM report) <br /> 1,229 ft3(7.48 gal/ft3)(8.328 lb H2O/gal)(382 lb Benzene/ix109 lb H20)=0.029 lb Benzene <br /> Zone 5:Volume: 20'x20'x3' = 1,200 ft3 <br /> Pore Volume: 1,200 ft3 (30%porosity)=360 ft3 <br /> Benzene =3.4 ppb(Benzene concentration from 4/03 QM report) <br /> 360 ft3(7.48 gal/ft3)(8.328 lb H2O/gal)(3.4 lb Benzene/lxl09 lb H20)=0.0001 lb Benzene <br /> Total dissolved Benzene in groundwater: 0.074 lb <br />