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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-8 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b e' ===> 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) (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): (-ht(2)/a)/365.25 NA NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Below WQO Below WQO <br /> -�MTBE t TBA —Depth to Groundwater <br /> 1,000.0 0 <br /> 100.0 4 F <br /> 0 10.0 8 <br /> � o <br /> � C7 <br /> u � <br /> U 1.0 12 w <br /> a <br /> C] <br /> 0.1 16 <br /> >f > 1 1 1 1 1 FIGURE <br /> Date C-16 <br /> Shell Stockton Terminal <br /> Shel3515 l <br /> Drive N M-8' <br /> Stockton,Caafomia MTEE and TBA Concentrations <br /> COMM YVERS and Depth to Groundwater <br /> &ASSOCIATES <br />