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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-4 <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) (PBA) <br /> Given <br /> WQO: }' 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): (-In(2)/a)/365.25 NA Not graphed <br /> Estimated Date to Reach WQO: (x=In(y/b)/a) Below WQO Not graphed <br /> —�MTBE —Depth to Groundwater <br /> 100 0 <br /> V <br /> O <br /> a F <br /> 1 � <br /> m <br /> 10 8 vG <br /> G M <br /> pG p <br /> 4i <br /> Q <br /> 1 16 <br /> FIGURE <br /> ti ti ti > <br /> Not enough data to graph Date C-13 <br /> TBA. <br /> Shell Stockton Terminal <br /> 3515 Nary Drive NlW_¢; <br /> Stockton,California MTBE and TBA Concentrations <br /> co&E AOIAROS ERS and Depth to Groundwater <br />