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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)(r]) = Mass contaminant in Groundwater <br /> Low <br /> Al 1257 Area of outer isoconcentration area ft, <br /> A2 Area of inner isoconcentration area ft2 <br /> CI 120 Concentration of outer isoconcentration µg/L- <br /> C2 Concentration of inner isoconcentration µglL <br /> T 10 Plume Thickness ft <br /> n 0 35 ri 13olids- <br /> 1 X51 lbs of 11 TPHd 11remaining in groundwater <br /> 0.01f Y� <br /> Chevron 9-2033 5lll I <br /> � `3z8 L/ff <br />