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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-2 <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 /> to=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 1.04E+06 <br /> Constant a -2.25E-04 <br /> Starling date for current trend: 3/24/1998 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Jul 2003 <br /> t TPHd —Depth to Groundwater <br /> 1,000 0 <br /> TPH&y=1E+06--� <br /> O <br /> F <br /> m � <br /> 100 10 <br /> m <br /> b o <br /> s <br /> U � <br /> a <br /> d <br /> Q <br /> 10 20 <br /> FIGURE <br /> Date C_5 <br /> Shell Stockton Terminal <br /> 3515 Navy Drive MW-2. <br /> Stockton,Califomia 77 1PHd Concentrations and <br /> CO�ROVERS Depth to Groundwater <br /> &ASSOCIATES <br />