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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-22 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b e' ===> x=In(y/b)/a <br /> where: y=concentration inµg/L a=decay constant <br /> b=concentration at time(x) x=time(x)in days <br /> Total Petroleum <br /> Hydrocarbons as <br /> Gasoline <br /> Constituent (TPHg) Benzene <br /> Given <br /> WQO: 210 46 <br /> Constant b 7.20E+07 7.78E+13 <br /> Constant. a -2.47E-04 -7.16E-04 <br /> Starting date for current trend: 3/24/1994 6/27/1994 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 7.68 2.65 <br /> Estimated Date to Reach WQO: (x=h1(y/b)/ a) Mar 2041 Aug 2007 <br /> t TPHg tBenzene —Depth to Groundwater <br /> 100,000 0 <br /> TPHg:y=7.20E+07e-z'1JE� <br /> 10,000 M 3 <br /> H <br /> a <br /> m 1,000 6 N <br /> � m <br /> o 'd <br /> b 100 9 0 <br /> a <br /> u o <br /> C <br /> U <br /> 10 IV MhpR <br /> 12 v <br /> Benzene:y=7.78E+13e-7.16E-0 A <br /> 1 15 <br /> x� <br /> 1 1 ti ti ti 1 S 1 1 1 1 1 1 FIGURE <br /> Date C-53 <br /> Shell Stockton Terminal MW-2Z- <br /> 3515 Navy Drive <br /> Stockton,California TPHg and Benzene Concentrations <br /> CONESiOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />