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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-20 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b e" ===> x=In(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 3.42E+17 NA <br /> Constant a -8.94E-04 NA <br /> Starting date for current trend: 12/20/1999 NA <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 2.12 NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Aug 2000 Below WQO <br /> --& MCBE --1 —Depth to Groundwater <br /> 100,000 0 <br /> TBA:y=3.08E+090.5513 s <br /> 10,000 3 uo <br /> F <br /> a <br /> m 1,000 6 <br /> 3 <br /> b <br /> b 100 9 °0y <br /> a V <br /> G � <br /> U <br /> 10 12 a <br /> MTBE:y=3.42E+170 a�-R- q <br /> 1 15 <br /> �' Ao Al Ati �' A°` A5 Ao Al Ao �' do titi titi <br /> FIGURE <br /> Date C-4^ <br /> Shell Stockton Terminal <br /> 3515 Navy Drive NM-20: <br /> Stockton,California MTBE and TBA Concentrations <br /> GONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />