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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-4 <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 /> WQC : 5. 210 46 <br /> Constant b NA NA <br /> Constant a NA NA <br /> Starting date for current trend: NA NA <br /> Calculate <br /> Attenuation Half Life(years): (-]n(2)/a)/365.25 NA NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) Below WQO Below WQO <br /> t TPHg tBenzene —Depth to Groundwater <br /> 1,000.0 0 <br /> fj <br /> 100.0 5 O <br /> a <br /> i v <br /> 0 10 .0 10 <br /> g <br /> m 5 <br /> U g <br /> 0 1.0 15 S <br /> U a <br /> Q <br /> 0.1 <br /> 20 <br /> 1° S �arA N� ��A tia�� of ti� FIGURE <br /> Date C-12 <br /> Shell Stockton Terminal MW-4: <br /> 3515 Navy Dave '�"- TPHg and Benzene Concentrations <br /> Stockton,California CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />