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MASS BALANCE CALCULATIONS <br /> (MtBE in Groundwater) <br /> Zone 1:Volume: 21'x20'x3'= 1,260 0 <br /> Pore Volume: 1,260 ft3 (30%porosity)=378 0 <br /> MtBE =280 ppb(MtBE concentration from 4/03 QM report) <br /> 378 ft3(7.48 gal/ft3)(8.328 lb H2O/gal)(280 lb MtBE/lx109 lb H20)=0.007 lb MtBE <br /> Zone 2:Volume: 60'x14'x3'=2,520 ft3 <br /> Pore Volume: 2,520 ft3 (30%porosity)= 756 ft3 <br /> MtBE = 770 ppb(MtBE concentration from 4/03 QM report) <br /> 756 ft3(7.48 gal/ft3)(8.328 lb H2O/gal)(770 lb MtBE/1x109 lb H20)=0.036 lb MtBE <br /> Zone 3:Volume: 60'x10'x3'= 1,800 ft3 <br /> Pore Volume: 1,800 ft3 (30%porosity)= 540 ft3 <br /> MtBE = 10,335 ppb(MtBE concentration from 4/03 QM report) <br /> 540 ft3(7.48 gal/ft3)(8.328 lb H20/gal)(10,335 lb MtBE/lx109 lb H20)=0.348 lb MtBE <br /> Zone 4:Volume: 60'x18'x3' =3,240 0 <br /> Pore Volume: 3,240 0 (30%porosity)=972 ft3 <br /> MtBE = 20,500 ppb(MtBE concentration from 4/03 QM report) <br /> 972 ft3(7.48 gaUft3)(8.328 lb-H20/gal)(20,500 lb MtBE/1x109 lb H20)= 1.241 lb MtBE <br /> Zone 5:Volume: 23'x10'x3' =690 0 <br /> Pore Volume: 690 ft3 (30%porosity)=207 ft3 <br /> MtBE =20,500 ppb (MtBE concentration from 4/03 QM report) <br /> 207 ft3(7.48 gal/ft3)(8.328 lb H2O/gal)(20,500 lb MtBE/lxl09 lb H20)=0.264 lb MtBE <br /> Zone 6:Volume: 20'x20'x3' = 1,200 0 <br /> Pore Volume: 1,200 ft3 (30%porosity)= 360 ft3 <br /> MtBE = 3,600 ppb(MtBE concentration from 4/03 QM report) <br /> 360 ft3(7.48 gal/ft3)(8.328 lb H2O/gal)(3,600 lb MtBE/lxl09 lb H20)=0.081 lb MtBE <br /> Zone 7:Volume: 39'x35'x3' =4,095 ft3 <br /> Pore Volume: 4,095 ft3 (30%porosity)= 1,229 ft3 <br /> MtBE = 12,050 ppb(MtBE concentration from 4/03 QM report) <br /> 1,229 ft3(7.48 gal/ft3)(8.328 lb H2O/gal)(12,050 lb MtBE/1x109 lb H20)=0.923 lb MtBE <br /> Total dissolved MtBE in P-roundwater: 2.90 lb <br />