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t <br /> TABLE 3 <br /> MTBE MASS BALANCE CALCULATIONS <br /> (Dissolved MtBE in Groundwater August 12, 2004) <br /> Parkinson's Hammer I-5 Arco <br /> 3250 West Hammer Lane, Stockton, California <br /> Zone 1 (500 ppb contour interval) <br /> Volume 7c(13')(12')(15')=7,351 ft3 <br /> Pore Volume 7,351 ft3 (30%porosity) =2,205 ft3 <br /> MtBE = 2,500 ppb = (2,500 lb MtBE/1x109 lb H20) <br /> 2,205 ft3(748 gal/ft3)(8 328 lb H20/gal)(2,500 lb MtBE/1x109 lb H20) =0 34 lb MtBE <br /> Zone 250 b contour interval <br /> ( PP ) <br /> Volume [7r(35')(27')(15')] — [a (13')(12')(15')] =3 7,18 1 ft3 <br /> Pore Volume 37,181 ft3 (30% porosity) = 11,154 ft3 <br /> MtBE = 275 ppb=(275 lb MtBE/IxI09 lb H20) <br /> 11,154 ft3(748 gal/ft3)(8 328 lb H20/gal)(275 lb MtBE/lxl09 lb H20)=0 19 lb MtBE <br /> Zone 3 (5 ppb contour interval) <br /> Volume [7c(67')(48')(15')] — [n(35')(27')(15')] = 107,018 ft3 <br /> Pore Volume 107,018 ft3 (30% porosity)=32,106 ft3 <br /> MtBE = 19 25 ppb =(19 25 lb MtBE/1x109 lb H20) <br /> 32,106 ft3(748 gal/ft)(8 328 lb H20/gal)(19 25 lb MtBE/1x109 lb H20) = 0 04 lb MtBE <br /> Total dissolved MtBE in groundwater 0 57 lb <br />