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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-13R <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be" ===> 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 /> 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 IN QO <br /> –A–MTBE --M–TBA —Depth to Groundwater <br /> 1,000.0 0 <br /> 100.0 5 O <br /> � 4 <br /> i <br /> 0 10.0 <br /> 10 b <br /> � O <br /> G C7 <br /> u $ <br /> 0 1.0 15 g <br /> U a <br /> v <br /> Q <br /> 0.1 20 <br /> FIGURE <br /> Date C-31 <br /> Shell Stockton Terminal NM-13R <br /> 3515 Navy Drive '�` MTBE and TBA Concentrations <br /> Stockton,Califontia CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />