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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-39 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be' ===> x=1n(y/b)/a <br /> where: y=concentration in lig/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 (PPHg) Benzene <br /> Given <br /> WQO: y 210 46 <br /> Constant b Stable trend Stable trend <br /> Constant a Stable trend Stable trend <br /> Starting date for current trend: Stable trend Stable trend <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 Stable trend Stable trend <br /> Estimated Date to Reach WQO: (x=1n(y/b)/a) Stable trend Stable trend <br /> tTPHg I Benzene —Depth to Groundwater <br /> 10,000 0 <br /> U <br /> O <br /> E <br /> 1,000 5 <br /> i w <br /> n <br /> n 'd <br /> b <br /> 100 10 U <br /> 0 0 <br /> U w <br /> v <br /> A <br /> 10 15 <br /> 1°r tiDS 1Dr 1°� N'" FIGURE <br /> Date C-74 <br /> Shell Stockton Terminal �l <br /> 3515 Navy DriveNW-39: <br /> Stockton,California TPHg and Benzene Concentrations <br /> CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />