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ATTACHMENT L <br />SOIL MASS BALANCE CALCULATION <br />Based on the assumption presented in the section entitled Soil Mass Balance Calculations, <br />the mass of contaminant can be calculated using the following equation <br />(A1- A2)I (Cl f C22 (T)(1- q)(p,) -Mass Contaminant in Soil <br />Where <br />(A1 -A2) - Outer isoconcentration Area minus inner isoconcentration area <br />(C1+C2)12 - Concentration of outer >soconcentrat>on added to the inner <br />isoconcentration divided by two <br />(T) - Plume Thickness <br />(n) - Porosity <br />(1-n) - Solids <br />(Pd) - Particle Density <br />• <br />0 077 41991 04319-5775PAR doc <br />