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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-38 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b ee' ===> 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 (rPHg) Benzene <br /> Given <br /> WQO: 210 46 <br /> Constant b 3.96E+14 NA <br /> Constant a -6.89E-04 NA <br /> Starting date for current trend: 8/28/2008 NA <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 2.75 NA <br /> Estimated Date to Reach WQO: (x=1n(y/b)/a) Mar 2012 Below WQO <br /> t TPHg t Benzene —Depth to Groundwater <br /> 1,000.0 0 <br /> 100.0 5 O <br /> TPHg:y=3.96E+14e6� H <br /> a <br /> m <br /> 0 10.0 10 <br /> m <br /> 0 <br /> c t7 <br /> G � <br /> U 1.0 15 a <br /> v <br /> Q <br /> 0.1 20 <br /> IN titi <br /> FIGURE <br /> Date C-7^ <br /> Shell Stockton Terminal ® MW-38: <br /> 3515 Navy Drive <br /> Stockton,California TPHg and Benzene Concentrations <br /> CM )VERS and Depth to Groundwater <br /> A ASSOCIATES <br />