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MASS BALANCE CALCULATIONS <br /> (Groundwater) <br /> Zone i 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 ft3 <br /> XMtBE=(<2 5+52+<2 5)13 = 19 ppb (MtBE concentrations from 11198 QM report) <br /> 71,982 ft' (7 48 gal/ft3)(8 3281b H20)(19 lb MtBE/1xl0' lb H20) = 0 09 lb MtBE <br /> Zone 2 20' bgs to 3 P bgs= l P 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 ft3 <br /> Pore Volume 293,260 ft' (0 50)= 146,630 ft' <br /> XMtBE_(5 7+5 2+<2 5)13 =20 ppb(MtBE concentrations from 11198 QM report) <br /> 146,630 ft3 (7 48 gal/ft3)(8 328 lb H20)(20 lb MtBE/lx109 lb H20)=0 18 lb MtBE <br /> Total dissolved MtBE: approximately 0.27 lb MtBE in groundwater beneath <br /> the site. <br />