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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-9 <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 Not graphed <br /> Constant a NA Not graphed <br /> Starting date for current trend: NA Not graphed <br /> Calculate <br /> Attenuation Half Life(years): (-ln(2)/a)/365.25 NA Not graphed <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Below WQO Not graphed <br /> t MTBE —Depth to Groundwater <br /> 100.0 <br /> 0 <br /> v <br /> 0 <br /> 10.0 F <br /> 6 <br /> m <br /> o b <br /> m 0 <br /> 0 <br /> G1.0 12 0 <br /> 0 <br /> U rte. <br /> a <br /> v <br /> A <br /> 0.1 18 <br /> FIGURE <br /> Not enough data to graph Date <br /> TBA. C-19 <br /> Shell Stockton Terminal O <br /> 3515 Navy Drive MW-9: <br /> Stockton,California MTBE and TBA Concentrations <br /> CONESTOO-AES and Depth to Groundwater <br />