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� • i <br /> GROUNDWATER RESIDUAL MASS BALANCE CALCULATION <br /> Constituents Residual <br /> of concern Area Height Volume COC Concentration Mass <br /> Calculation GW GW Lower Upper <br /> (COC) Total area area Content Volume Contour Contour Average Average <br /> (ft2) (ft2) ft (f13) (L) NO (L) (ppb) (ppb) (ppb) (kg/L) (kg) <br /> MTBE C 33,000 22,000 30 6 60E+05 l 87E+07 25% 4 67E+06 - 50 25 2 50E-09 0 012 <br /> B 11,000 6,600 30 1 98E+05 5 60E+06 25% 1 40E+06 50 10 75 7 50E-09 0 011 <br /> A 4,400 4,400 30 1 32E+05 3 74E+06 25% 9 34E+05 10 16 13 1 30E-08 0 012 <br /> 30 0 00E+00 0 00E+00 25% 0 00E+00 - - - 0 00E+00 <br /> Total 0 034 <br /> 1,2-DCA C 33,000 19,000 30 5 70E+05 1 61E+07 25% 4 03E+06 - 20 10 1 OOE-09 0 004 <br /> B 14,000 9,600 30 2 88E+05 8 15E+06 25% 2 04E+06 20 50 35 3 50E-09 0 0071 <br /> A 4,400 4,400 30 1 32E+05 3 74E+06 25% 9 34E+05 50 57 54 5 35E-09 0 005 <br /> 30 0 OQE+00 0 00E+00 25% 0 00E+00 - - - 0 00E+00 - <br /> Total 0 016 <br /> TPHd B 5,800 3,200 30 9 60E+04 2 72E+06 25% 6 79E+05 - 100 50 5 OOE-08 0 034 <br /> A 2,600 2,600 30 7 80E+04 2 21E+06 25% 5 52E+05 100 610 355 3 55E-07 020 <br /> 30 0 00E+00 0 00E+00 25% 0 00E+00 - - - 0 00E+00 - <br /> 30 0 00E+00 0 00E+00 25% 0 00E+00 - - - 0 00E+00 - <br /> Total 023 <br />