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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 = be' ===> 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 /> Diesel <br /> Constituent (TPHd) <br /> Given <br /> WQO: y 210 <br /> Constant b NA <br /> Constant a NA <br /> Starting date for current trend: NA <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Stable Trend <br /> tTFHd —Depth to Groundwater <br /> 1,000 0 <br /> 0 <br /> O <br /> F <br /> a <br /> s °= <br /> 0 100 10 b <br /> a <br /> b o <br /> 3 E <br /> U <br /> a <br /> v <br /> O <br /> 10 20 <br /> FIGURE <br /> Date <br /> C-70 <br /> Shell Stockton Terminal MW-38. <br /> 3515 Navy Drive <br /> Stockton,California TPHd Concentrations and <br /> COMESTOGA•ROVERS Depth to Groundwater <br /> &ASSOCIATES <br />