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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-18 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b e' ===> x=ln(y/b)/a <br /> where: y=concentration in pg/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 (IPHg) Benzene <br /> Given <br /> WQO: y 210 46 <br /> Constant b 3.97E+05 NA <br /> Constant a -2.00E-04 NA <br /> Starting date for current trend: 9/29/1993 NA <br /> Calculate <br /> Attenuation Half Life(years): (-ht(2)/a)/365.25 9.48 NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Mar 2003 Below WQO <br /> --m—TPHgtBmzene —Depthto Groundwater <br /> 10,000.0 0 <br /> TPHg:y=3.97E+05e-2w <br /> 1,000.0 3 fj <br /> O <br /> F <br /> 100.0 6 v <br /> 3 � <br /> G v <br /> a <br /> c 10.0 9 <br /> v C7 <br /> is s <br /> 0 <br /> 1.0 12 <br /> 0 <br /> 0.1 15 <br /> �FIGURE <br /> ti 1 1 1 ti 1 1 1 ti ti 1 <br /> Date <br /> C-42 <br /> Shell Stockton Terminal <br /> Shel3515 l <br /> Drive MW-18. <br /> Stockton,California TPHg and Benzene Concentrations <br /> CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />