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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-1 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b ea" ===> 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 b 3.74E+20 2.91E+17 <br /> Constant a -8.74E-04 -7.73E-04 <br /> Starting date for current trend: 5/12/2005 11/30/2005 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 217 2.46 <br /> Estimated Date to Reach WQO: (x=In(y/b)/a) Dec 2024 Oct 2007 <br /> —A—MTBE —f--TBA —Depth to Groundwater <br /> 1,000,000 0 <br /> MTBE:y=262E+190+74En. <br /> H <br /> j 100,000 7 <br /> coo w <br /> o 'd <br /> b o <br /> 10,000 14 0 <br /> C <br /> U �Ei <br /> a <br /> a <br /> TBA:y=291E+17e-7-73P-04- C] <br /> 1,000 21 <br /> 1f Nf, If Sf FIGURE <br /> Date <br /> C-4 <br /> Shell Stockton ermuial <br /> 3515 Navy Drive MW"1' <br /> Stockton,California MTBE and TBA Concentrations <br /> CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />