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TABLE 2 <br /> MTBE MASS BALANCE CALCULATIONS <br /> (Dissolved MtBE in Groundwater June-July 2003) <br /> Parkinson's Hammer I-5 Arco <br /> 3250 West Hammer Lane, Stockton, California <br />' Zone l (5,000 ppb contour interval) <br /> Volume x(57')(17')(15')= 45,663 ft3 <br /> Pore Volume 45,663 ft(30% porosity)= 13,699 ft3 <br /> MtBE = 12,000 ppb=(12,000 lb MtBE/1x109 lb H20) <br /> 13,699 ft3(7 48 gal/ft)(8 328 lb H2O/gal)(12,000 lb MtBE/1x109 lb H20)= 10 24 lb MtBE <br /> Zone 2 (500 ppb contour interval) <br /> Volume [x(112')(42')(15')]— [x (57')(17')(15')] = 176,008 ft3 <br /> Pore Volume 176,008 ft3 (30%porosity)= 52,802 ft3 <br /> MtBE = 1,890 ppb= (1,890 lb MtBE/1x109 lb H20) <br /> 52,80.2 ft3(7 48 gal/ft)(8 328 lb H20/gal)(1,890 lb MtBE/Ix109 lb 1120)=6 22 lb MtBE <br /> Zone 3 (50 ppb contour interval) <br /> Volume [x (133')(70')(15')]—[x(112')(42')(15')] =217,052 ft3 <br /> Pore Volume 217,052 ft3 (30%porosity)=65,116 ft3 <br /> MtBE = 176 ppb=(176 lb MtBE/1x109 lb H20) <br />' 65,116 ft3(7 48 gal/ft)(8 328 lb H20/gal)(I76 lb MtBE/1x109 lb H20)= 0 71 Ib MtBE <br /> Zone 4 (5 ppb contour interval) <br /> Volume [n(167')(87')(15')] — [x (133')(70')(15')] =245,940 fl <br /> Pore Volume 245,940 ft3 (30% porosity)=73,782 ft3 <br /> MtBE = 27 5 ppb=(27 5 lb MtBE/Ix109 lb H20) <br /> 73,782 ft3(7 48 gal/ft)(8 328 lb H20/gal)(27 5 lb MtBE/1x109 lb 1120)=0 13 lb MtBE <br />' Total dissolved MtBE in groundwater 17 30 lb <br /> 1 <br /> 1 <br />