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f� APPENDIX H <br /> GROUNDWATER MASS BALANCE CALCULATION <br /> Based on the assumption presented in the section entitledGroundwater Mass Balance Calculations, <br /> the mass of contaminant can be calculated using the following equation <br /> High C 1 + C 2 <br /> (A1 — A2) 2 (T)(r]) = Mass contaminant in Groundwater <br /> Low <br /> Al 1257 Area of outer isoconcentration area ft <br /> A2 Area of inner isoconcentration area ft <br /> C1 500 Concentration of outer isoconcentration µg/L <br /> C2 Concentration of inner isoconcentration µg/L <br /> T 10 Plume Thickness ft <br /> n 0 35 Solids <br /> ,y <br /> 7 lbs. of IlBenzenellremaining in groundwater <br /> pL <br /> I? 8 5' <br /> Chevron 9-2033 <br /> 1 <br /> f <br />