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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-13R <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b e' ===> x=ln(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 /> Diesel <br /> Constituent (TPHd) <br /> Given <br /> WQO: y 210 <br /> Constant b 3.45E+07 <br /> Constant a -2.51E-04 <br /> Starting date for current trend: 5/30/2003 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 7.57 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) Apr 2031 <br /> t TPI-Id —Depth to Groundwater <br /> 10,000 0 <br /> U <br /> O <br /> F <br /> a <br /> m v <br /> a '= <br /> b <br /> n 1,000 ----- 10 b <br /> b <br /> 0 <br /> U° TPHd:y=3E+07e-3 <br /> a <br /> m <br /> Q <br /> 100 20 <br /> 1 1 ti 1 1 1 ti 1 FIGURE <br /> Date C-29 <br /> Shell Stockton Terminal <br /> 3515 Navy Drive MW-13R: <br /> Stockton,California TPHd Concentrations and <br /> COIVCSTOOA-ROVERS Depth to Groundwater <br /> &ASSOCIATES <br />