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S E C O R <br />ATTACHMENT D <br />SOIL MASS BALANCE CALCULATION <br />Based on the assumption presented in the section titled Estimated Mass of Petroleum <br />Hydrocarbons in Soil, the mass of contaminant can be calculated using the following equation: <br />Nish Cl + C2 Mass Contaminant in Soil <br />Y, (A1- A2)� 2 (T)(1- 71)(Pd) <br />Low <br />Where-.(Al-A2)-� Outer isoconcentr iArea <br />a mincent ation added to the inneus inner isoconcentration ea. <br />(C1 }C2)/2 - Concentration ofouter <br />isoconcentration divided by two. <br />(T) -- Plume Thickness <br />(n) - Porosity <br />(1-n) - Solids <br />(Pd) - Particle Density <br />