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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-12 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be" ===> 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 /> Total Petroleum <br /> Hydrocarbons as <br /> Gasoline <br /> Constituent (rPHg) Benzene <br /> Given <br /> WQO: y 210 46 <br /> Constant: b 3.47E+04 8.12E+14 <br /> Constant a -9.97E-05 -8.70E-04 <br /> Starting date for current trend: 10/28/1996 11/13/1995 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 19.03 2.18 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Feb 2040 Below WQO <br /> tTPHg t Benzene —Depth to Groundwater <br /> 10,000.0 0 <br /> TPHg:y=3.47E+04e4 mE <br /> 1,000.0 <br /> 4 U <br /> F <br /> a LL, <br /> i 100.0 8 v <br /> n <br /> b � <br /> c 10.0 12 ��1 <br /> V <br /> V <br /> 2 <br /> v 1.0 16 a <br /> Pe <br /> Benzene:y=8.12E+140--- E-04• C1 <br /> 0.1 20 <br /> 1 1 1 1 1 1 1 1 4 FIGURE <br /> Date <br /> C-2/7 <br /> Shell Stockton Terminal }, <br /> 3515 Navy Drive MW-12: <br /> Stockton,California 7777 TPHg and Benzene Concentrations <br /> &c A and Depth to Groundwater <br />