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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 historic high <br /> depth-to-water(DTW)to historic low DTW) <br /> Porosity=0 30(sandy soil) <br /> Volume 172xl55x9' =239,940 ft' <br /> Pore Volume 239,940 ft'(0 30)= 71,982 ft' <br /> XBenzene =(<o 5+<0 5+<0 5)/3 =0 5 ppb(Benzene concentrations from 11198 QM report) <br /> 71,982 ft' (7 48 gal/W)(8 3281b H20)(0 5 lb Benzene/1x10' Ib H20) =0 002 lb Benzene <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 172xl55x9' =239,940 ft' <br /> Pore Volume 293,260 ft' (0 50)= 146,630 ft' <br /> XBenzene=(<0 5+<0 5+<0 5)13 =0 5 ppb(Benzene concentrations from 11198 QM report) <br /> 146,630 ft' (7 48 gal/ft')(8 328 lb H20)(0 5 lb Benzene/1x109 Ib H20)=0 005 lb Benzene <br /> Total dissolved Benzene; approximately 0.007 lb Benzene in groundwater <br /> beneath the site. <br />