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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-23 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b e°" ===> x=ln(v/b)/a <br /> where: y=concentration in gg/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 NA NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Below WQO Below WQO <br /> —t MTBE —m—TBA —Depth to Groundwater <br /> 1,000.0 p <br /> 100.0 4 O <br /> H <br /> i v <br /> m <br /> 0 10.0 8 d <br /> w <br /> b o <br /> v C7 <br /> U 1.0 12 <br /> a <br /> a <br /> A <br /> 0.1 16 <br /> FIGURE <br /> Date C-57 <br /> ^ <br /> Shell Stockton Terminal <br /> 3515 Navy Drive � }-� MW-23: <br /> Stockton,California MTBE and TBA Concentrations <br /> CONEES OG-RTO�VERS and Depth to Groundwater <br />