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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 7E(10')(10')(15')=4,712 ft3 <br /> Pore Volume 4,712 ft(30% porosity)= 1,414 ft3 <br /> Benzene = 86 ppb= (86 lb Benzene/1x109 lb H20) <br /> 1,414 ft3(7 48 gal/ft)(8 328 lb H20/gal)(86 lb Benzene/1x109 lb H20) =0 008 lb Benzene <br /> Zone 25 b contour interval <br /> ( PP ) <br /> Volume [7c(25')(24')(15')] — [7r(10')(10')(15')] =23,562 ft3 <br /> Pore Volume 23,562 ftp (30%porosity) =7,069 ft3 <br /> Benzene = 27 5 ppb= (27 5 lb Benzene/1x109 lb H20) <br /> 7,069 ft3(7 48 gal/ft)(8 328 lb H20/gal)(27 5 lb Benzene/I x 109 lb H20)=00 12 lb Benzene <br /> Zone 3 (0 5 ppb contour interval) <br /> Volume [7c (50')(40')(15')] — [7c(25')(24')(15')] =65,974 ft3 <br /> Pore Volume 65,974 ft3 (30%porosity)= 19,792 ft3 <br /> Benzene =0 93 ppb=(0 93 lb Benzene/1x109 lb H20) <br /> 19,792 ft3(748 gal/W)(8 328 lb H20/gal)(0 93 lb Benzene/Ix1091b H20) =0 011 Ib Benzene <br /> i <br /> Total dissolved Benzene in groundwater 0 031 lb <br />