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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-33 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be" ===> x=ln(y/b)/a <br /> where: y=concentration in 1tg/L a=decay constant <br /> b=concentration at time(x) x=time(x)in days <br /> Total Petroleum <br /> Hydrocarbons as <br /> Gasoline <br /> Constituent (TPHg) Benzene <br /> Given <br /> WQO: y 210 46 <br /> Constant: b 2.63E+06 1.61E+09 <br /> Constant a -1.77E-04 -4.17E-04 <br /> Starting date for current trend: 2/21/2002 2/21/2002 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 10.69 4.55 <br /> Estimated Date to Reach WQO: (x=In(y/b)/a) Ju12045 Jan 2014 <br /> —M—TPHg i Benzene —Depth to Groundwater <br /> 10,000 0 <br /> TPHg:y=263E+06e-1-77E O x <br /> V <br /> O <br /> E+ <br /> a 1,000 4 <br /> .n Benzene:y=1.61E+09e'lly d <br /> b o <br /> 10o g C7 <br /> o � <br /> U � <br /> a <br /> v <br /> Q <br /> to 12 <br /> FIGURE <br /> Date <br /> C-66 <br /> Shell Stockton Terminal MW-33: <br /> Stockton,California g Navy Drive TPHg and Benzene Concentrations <br /> Stoc <br /> CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />