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1 <br /> I <br /> TABLE 2 <br /> BENZENE MASS BALANCE CALCULATIONS <br /> (Dissolved Benzene in Groundwater August 12, 2004) <br /> Parkinson's Hammer I-5 Arco <br /> 3250 West Hammer Lane, Stockton, California <br /> Zone 1: (50 ppb contour interval) <br /> Volume: 71(10')(10')(15')=4,712 ft3 <br /> Pore Volume: 4,712 ft3 (30%porosity)= 1,414 ft3 <br /> Benzene =86 ppb=(86 lb Benzene/lx109 lb H20) <br /> 1,414 ft3(7.48 gal/ft3)(8.328 lb H2O/gal)(86 lb Benzene/lxl09 lb H20)=0.008 lb Benzene <br /> Zone 2: pp <br /> 5 b contour interval <br /> ( <br /> Volume: [n(25')(24')(15')]—[n(10')(10'M 5')] =2 3,5 62 ft3 <br /> Pore Volume: 23,562 ft3(30%porosity)=7,069 ft3 <br /> Benzene = 27.5 ppb=(27.5 lb Benzene/1x109 lb H20) <br /> it <br /> 7,069 ft3(7.48 gal/ft3)(8.328 lb H2O/gal)(27.5 lb Benzene/lxl09 lb H20)=0.012 lb Benzene <br /> Zone 3: (0.5 ppb contour interval) <br /> Volume: [7c(50')(40')(15')]—[71(25')(24')(15')] =65,974 ft3 <br /> -t Pore Volume: 65,974 ft3 (30%porosity)= 19,792 ft3 <br /> Benzene =0.93 ppb=(0.93 lb Benzene/1x109 lb 1420) <br /> 19,792 ft3(7.48 gal/ft3)(8.328 ib H20/gal)(0.93 lb Benzene/lxl09 lb H20)=0.011 lb Benzene <br /> l <br /> Total dissolved Benzene in groundwater:0.031 lb <br /> 1 <br /> 1 <br />