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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-11 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be' ___> x=ln(v/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 1,500 15,000 <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 --w-TBA —Depth to Groundwater <br /> 10,000 0 U <br /> O <br /> F <br /> 1,000 10 <br /> eo v <br /> i <br /> m <br /> 0 3 <br /> m <br /> 100 20 C7 <br /> 0 8 <br /> u .g <br /> w <br /> a <br /> Q <br /> 10 30 <br /> ti� FIGURE <br /> Date C-25 <br /> Shell Stockton Terminal L <br /> 3515 Navy Drive MW-11: <br /> Stockton,California MTBE and TBA Concentrations <br /> CGh 1/ERs and Depth to Groundwater <br />