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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-12 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be ax ===> 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 /> Methyl Tertiary Tertiary Butyl <br /> Butyl Ether Alcohol <br /> Constituent (MTBE) (TBA) <br /> Given <br /> WQO: y 1,800 18,000 <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): (-ln(2)/a)/365.25 NA NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Below WQO Below WQO <br /> - -MTBE --m–TBA —Depth to Groundwater <br /> 100.0 0 <br /> U <br /> O <br /> F <br /> 10.0 6 4 <br /> � v <br /> i <br /> 3 <br /> o <br /> .b <br /> � o <br /> 1.0 12 0 <br /> y O <br /> 0.1 18 <br /> FIGURE <br /> Date <br /> C-28 <br /> Shell Stockton Terminal ® MW-12: <br /> Navy Drive <br /> Stockton, <br /> MTBE and TBA Concentrations <br /> Stockton,California CONESTDGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />