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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-19 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be' x=In(y/b)/a <br /> where: y=concentration in gg/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: y 210 46 <br /> Constant b NA N;% <br /> Constant a NA NA <br /> Starting date for current trend: NA \A <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 NA NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Below WQO Below WQO <br /> t TPHg i Benzene —Depth to Groundwater <br /> 1,000.0 0 <br /> 100.0 4 O <br /> E~ <br /> a <br /> A <br /> 0 10.0 g <br /> m <br /> G 2 <br /> u <br /> q <br /> V 1.0 12 <br /> n, <br /> v <br /> Q <br /> 0.1 16 <br /> FIGURE <br /> Date <br /> C-45 <br /> Shell Stockton Terminal MW-19: <br /> Stockton,California g Navy Drive TPH and Benzene Concentrations <br /> Stoc <br /> CONE ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />