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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-39 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b e"` ===> x=ht(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): (-In(2)/a)/365.25 N1 NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) Below WQO Below WQO <br /> -A-MTBE --w-TBA —Depth to Groundwater <br /> 1,000 0 <br /> F <br /> i m <br /> a 100 b <br /> a oy <br /> m 0 <br /> v U <br /> [ o <br /> V � <br /> Q <br /> 10 1 14 <br /> FIGURE <br /> Date C-75 <br /> Shell Stockton Terminal <br /> 3515 Navy Drive MW-39: <br /> Stockton,California MTBE and TBA Concentrations <br /> CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />