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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-21 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be" ===> x=1n(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): (-In(2)/a)/365.25 NA NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Below WQO Below WQO <br /> –t MTBE -mw–TBA —Depth to Groundwater <br /> 10,000.0 0 <br /> 1,000.0 A3 U <br /> O <br /> � 100.0 6 v <br /> m <br /> 0 3 <br /> 10.0 9 <br /> u U <br /> G O <br /> 0 <br /> u 1.0 <br /> 12 v <br /> A <br /> 0.1 15 <br /> NO FIGURE <br /> Date C-51 <br /> Shell Stockton Terminal <br /> 3515 Navy Drive } MW-21: <br /> Stockton,California MTBE and TBA Concentrations <br /> CONESTOGA--ROS ERS and Depth to Groundwater <br />