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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-16 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be"- ===> x=In(}'/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 2.99E+05 1.70E+10 <br /> Constant a -9.24E-05 -4.27E-04 <br /> Starting date for current trend: 11/18/1997 6/27/1994 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 20.55 4.45 <br /> Estimated Date to Reach WQO: (x=In(y/b)/a) Mar 2115 Jul 2026 <br /> t TPHg 9Benzene --Depth to Groundwater <br /> 100,000 <br /> 0 <br /> TPHg:y=299E+05e-9 2 E- - <br /> 10,000 IP <br /> 7 O <br /> i w <br /> b 1,000 14 3 <br /> go <br /> o <br /> V <br /> 0 100 <br /> U9 <br /> Benzene:y=1.70E+10e 21 a <br /> v <br /> A <br /> 10 28 <br /> h 5 ti M <br /> Date FIGURE <br /> C-39 <br /> Shell Stockton Ternunal ® MW-16: <br /> 3515 Navy Drive <br /> Stockton,California TPHg and Benzene Concentrations <br /> CONESrOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />