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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-21 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be a. ===> 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 /> Total Petroleum <br /> Hydrocarbons as <br /> Gasoline <br /> Constituent (rPHg) Benzene <br /> Given <br /> WQO: y 210 46 <br /> Constant: b 2.58E+08 1.33E+17 <br /> Constant a -3.45E-04 -9.85E-04 <br /> Starting date for current trend: 6/15/1995 3/25/1993 <br /> Calculate <br /> Attenuation Half Life(years): (-ln(2)/a)/365.25 5.50 1.93 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) Mir 2011 Dec 1998 <br /> t TPHg - Benaene —Depth to Groundwater <br /> 100,000.0 - 0 <br /> Benzene:y=1.33E+17e 85Ea4. <br /> 10,000.0 TPH 25813+080.45E - 2 (j <br /> $y O <br /> F <br /> .i 1,000.0 4 <br /> m <br /> 0 100.0 <br /> 6 <br /> b o <br /> 10.0 8 0 <br /> o � <br /> U 1.0 10 Q <br /> 0.1 12 <br /> qti dh qh P°' <br /> �xr 1f 1 1 las �xr far lar fat` FIGURE <br /> Date C-50 <br /> Shell Stockton Terminal �� MW-21; <br /> 3515 Navy Drive �' TPHg and Benzene Concentrations <br /> Stockton,California and Depth to Groundwater <br /> CONESTOOROVERS P <br /> &ASSOCIATES <br />