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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 /> Nigh C 1 + C 2 <br /> (A1 — A2) 2 (T)(r7) = Mass contaminant in Groundwater <br /> L, w <br /> Al 850 Area of outer isoconcentration area ft <br /> A2 Area of inner isoconcentration area ft <br /> C1 6800 Concentration of outer isoconcentration µg/!- <br /> C2 <br /> glLC2 Concentration of inner isoconcentration fig& <br /> T 10 Plume Thickness ft <br /> n 035 Solids <br /> • fi3l-71 lbs of 11 TPHg 11remaining in groundwater <br /> a. 3d <br /> Chevron 9-2033 ,`�1��f <br /> 1 <br />