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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-8 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b eaz ___> x=1n(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: y 210 46 <br /> Constant b 2.18E+04 2.56E+13 <br /> Constant a -4.80E-05 -6.73E-04 <br /> Starting date for current trend: 9/27/1994 3/25/1993 <br /> Calculate <br /> Attenuation Half Life (years): (-hi(2)/a)/365.25 39.54 2.52 <br /> Estimated Date to Reach WQO: (x=In(y/b)/a) Dec 2164 Jan 2010 <br /> -n-TPHg 0 Benzene —Depth to Groundwater <br /> 100,000 <br /> 0 <br /> TPHg:y=2.18E+04e4a8"5- <br /> 10,000 3 <br /> u <br /> 0 <br /> 1,000 6 v <br /> 3 <br /> e <br /> b v <br /> 100 9 <br /> V U <br /> 2 <br /> U 10 <br /> 12 a <br /> A <br /> Benzene:y=256E+13e4-msO4z <br /> 1 15 <br /> Date <br /> FIGURE <br /> C-15 <br /> Shell Stockton Terminal <br /> 3515 Navy Drive MW-8: <br /> Stockton,California TPHg and Benzene Concentrations <br /> CONESrOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />