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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-38 <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): (-In(2)/a)/365.25 NA NA <br /> Estimated Date to Reach WQO: (x=In(y/b)/ a) Below WQO Below WQO <br /> -*-MTBE --w-TBA —Depth to Groundwalt <br /> 100 0 <br /> O <br /> H <br /> a <br /> � w <br /> 3 � <br /> m <br /> 0 10 10 v <br /> m 0 <br /> r <br /> C g <br /> v 'S <br /> A <br /> 1 20 <br /> O ti ry <br /> 1'°r ti'dr� 1'dr ti'Dr SO FIGURE <br /> Date C-7^ <br /> Shell Stockton Terminal NM-38: <br /> Stockton, <br /> 3515 Navy Drive <br /> Stockton,California MTBE and TBA Concentrations <br /> Co & GIART�S and Depth to Groundwater <br />