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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-3 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be' ===> 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=In(y/b)/a) Below WQO Below WQO <br /> —k—MTBE —*—TBA —Depth to Groundwater <br /> 100 0 <br /> O <br /> F <br /> � v <br /> i <br /> m <br /> ° 10 7 <br /> m o <br /> G O <br /> Q <br /> 1 14 <br /> xr� �Ati ar xs ymsf s a � �~ <br /> � ti 1 1 1 1 ti FIGURE <br /> Date C-10 <br /> in <br /> Shell Stockton Terminal }� <br /> 3515 Navy Drive ,`1' MW 3. <br /> Stockton,California MTBE and TBA Concentrations <br /> co NE& OMAciq-R S and Depth to Groundwater <br />