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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-3 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b e"` ===> 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 Stable trend NA <br /> Constant a Stable trend NA <br /> Starting date for current trend: Stable trend NA <br /> Calculate <br /> Attenuation Half Life(years): (-ln(2)/a)/365.25 Stable trend NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Stable trend Below WQO <br /> M–TFHg 0 Benzene —Depth to Groundwater <br /> 1,000.0 0 <br /> Flu 1 <br /> 100.0 ti 5 O <br /> i v <br /> 0 10.0 3 <br /> .n 10 � <br /> G � <br /> j 1.0 ° <br /> 15 ry <br /> a <br /> d <br /> 0 <br /> 0.1 20 <br /> FIGURE <br /> Date <br /> C-9- <br /> Shell Stockton Terminal �p <br /> 3515 Navy Drive <br /> Stockton,California *_ TPHg and Benzene Concentrations <br /> CONEsTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />