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TABLE 1 <br /> TPHg MASS BALANCE CALCULATIONS <br /> (Dissolved TPHg 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 7r(13')(10')(15')=6,126 ft3 <br /> Pore Volume 6,126 ft3 (30%porosity) = 1,838 ft3 <br /> TPHg = 1,100 ppb=(1,100 lb TPHg/1 x 109 lb H20) <br /> 1,838 ft3(7 48 gal/ft')(8 328 lb H20/gal)(1,100 lb TPHg/1x109 lb 1-120) =0 13 lb TPHg <br /> Zone 2 (50 ppb contour interval) <br /> Volume [7r(45')(3?')(15')] —fir(13')(10')(15')] =61,732 ft3 <br /> Pore Volume 61,732 ft3 (30%porosity)= 18,520 ft3 <br /> TPHg = 102 ppb=(102 lb TPHg/1 x 109 lb H20) <br /> 61,732 ft3(7 48 gal/ft3)(8 328 lb H20/gal)(102 Ib TPHg/1x109 lb H20) 0 39 lb TPHg <br /> Total dissolved TPHg in groundwater 0 52 lb <br />