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S E C O R <br />ATTACHMENT D <br />GROUNDWATER MASS BALANCE CALCULATION <br />Based on the assumption presented in the section titled Estimated Mass of Petroleum <br />Hydrocarbons in Groundwater, the mass of contaminant can be calculated using the following <br />equation: <br />High <br />)Cl C2 <br />E( <br />Al — A2 2 (T)(77) =Mass Contaminant in Groundwater <br />Low <br />Where: (Al -A2) — Outer isoconcentration Area minus inner isoconcentration area. <br />(CI +C2)12 — Concentration of outer isoconcentration added to the inner <br />isoconcentration divided by two. <br />(T) — Plume Thickness <br />(n) - Porosity <br />