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• ATTACHMENT J <br />GROUNDWATER MASS BALANCE CALCULATION <br />Based on the assumption presented in the section entitled Groundwater Mass Balance <br />Calculations, the mass of contaminant can be calculated using the following equation <br />Y(Al — A2) Cl 2 C2 (T)Q7) = Mass Contaminant in Groundwater <br />Low <br />Where (A1 -A2) —Outer isoconcentration Area minus inner isoconcentration area <br />(C1+C2)/2 — Concentration of outer isoconcentration added to the inner <br />isoconcentration divided by two <br />(T) — Plume Thickness <br />(n) - Porosity <br />• <br />0 <br />