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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-18 <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 (NME) (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): (-In(2)/a)/365.25 NA NA <br /> Estimated Date to Reach WQO: (x=In(y/b)/a) Below WQO Below WQO <br /> f-MTBE –sI —Depth to Groundwater <br /> 100.0 0 <br /> Jill <br /> F <br /> a 10.0 5 <br /> � w <br /> eo v <br /> 3 m <br /> b <br /> b o <br /> 1.0 10 U <br /> .2 <br /> U a <br /> v <br /> A <br /> 0.1 15 <br /> FIGURE <br /> Date <br /> C-43 <br /> Shell Stockton Terminal <br /> 3515 Navy Drive MW-18: <br /> Stockton,Cattfornia MTBE and TBA Concentrations <br /> CO E�A�Rs and Depth to Groundwater <br />