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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-1 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be" ===> x=ln(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 2.02E+20 4.19E+16 <br /> Constant a -9.24E-04 -7.62E-04 <br /> Starting date for current trend: 8/16/2004 8/16/2004 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 2.05 2.49 <br /> Estimated Date to Reach WQO: (x=In(y/b)/ a) Aug 2022 Sep 2023 <br /> t TPHg -+-Benze<ie —Depth to Groundwater <br /> 10,000,000 5 <br /> 1,000,000 15 <br /> TPHg:y=2.02E+20e-9.24ED4x <br /> F <br /> 100,000 25 �. <br /> i m <br /> 0 10,000 35 v <br /> mto <br /> c 1,000 45 $ <br /> u a <br /> 100 55 O <br /> Benzene:y=4.19E+16e-7-62E-0 <br /> 10 65 <br /> FIGURE <br /> Date C—^ <br /> Shell Stockton Terminal ® MW-1: <br /> 3515 Navy Drive <br /> Stockton,California TPHg and Benzene Concentrations <br /> t l&ASSOCIATES RS and Depth to Groundwater <br /> &ASSOCIATES <br />