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MASS BALANCE CALCULATIONS <br /> (Groundwater) <br /> Zone 1 11' bgs to 20' bgs= 9' water column (fluctuation zone of groundwater from <br /> historic high depth-to-water(DTW) to historic low DTW) <br /> Porosity = 0 30 (sandy soil) <br /> Volume 172x155x9' =239,940 ft' <br /> Pore Volume 239,940 ft3 (0 30) = 71,982 ft' <br /> XTPHg =(<50+<50+<50)13 = 50 ppb (TPHg concentrations from 11198 QM report) <br /> 71,982 ft3 (7 48 gal/ft3)(8 328 lb H20)(50 lb TPHg/1x109) lb H20)= 0 2 lb TPHg <br /> Zone 2 20' bgs to 31' bgs= 11' water column(measured from historic low DTW to <br /> bottom of well) <br /> Porosity =0 50 (silty and clayey soil) <br /> Volume 172x155x9' =239,940 ft3 <br /> Pore Volume 293,260 ft3 (0 50) = 146,630 ft3 <br /> XTPHg = (<50+<50+<50)/3 = 50 ppb (TPHg concentrations from 11198 QM report) <br /> 146,630 ft3 (7 48 gaUft)(8 328 lb H20)(50 lb TPHg/1x10') lb H20) =05 LB TPHg <br /> Total dissolved TPHg: approximately 0.71b TPHg in groundwater beneath the <br /> site. <br />