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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-39 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> Y = be" ===> 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 /> Diesel <br /> Constituent (TPHd) <br /> Given <br /> WQO: y 210 <br /> Constant b NA <br /> Constant a NA <br /> Starting date for current trend: NA <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Stable Trend <br /> –9–TPHd —Depth to Groundwater <br /> 10,000 0 <br /> O <br /> F <br /> 0 1,000 10 0 <br /> m <br /> b o <br /> a� O <br /> U o <br /> d <br /> Q <br /> 100 , 20 <br /> FIGURE <br /> Date C-73 <br /> Shell Stockton Terminal ® NM-39. <br /> 3515 Navy Drive TPHd Concentrations and <br /> Stockton,California <br /> FOGA-ROVERS Depth to Groundwater <br /> &ASSMATES <br />