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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-2 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be ax ===> x=1n(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 6 NA Not graphed <br /> Constant a NA Not graphed <br /> Starting date for current trend: NA Not graphed <br /> Calculate <br /> Attenuation Half Life(years): (-ln(2)/a)/365.25 NA Not graphed <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Below WQO Not graphed <br /> —.MTBE —Depth to Groundwater <br /> 1,000 <br /> 0 <br /> u <br /> OF <br /> 100 <br /> 6 <br /> eo ,: <br /> v <br /> b b <br /> G <br /> u 10 12 Uo <br /> o S <br /> U <br /> w <br /> v <br /> Q <br /> 1 18 <br /> ti 1 1 1 1 ti 1 1 FIGURE <br /> Not enough data to graph Date <br /> TBA. C-7 <br /> Shell Stockton Terminal <br /> 3515 Navy Drive 1IW-2; <br /> Stockton,California MTBE Concentrations and <br /> c0�CCjA ES Depth to Groundwater <br />