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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-23 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b e' ===> 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 /> Diesel <br /> Constituent (TPHd) <br /> Given <br /> WQO: y 210 <br /> Constant b 7.50E+09 <br /> Constant a -4.10E-04 <br /> Starting date for current trend: 11/18/1997 <br /> Calculate <br /> Attenuation Half Life(years): (-ln(2)/a)/365.25 4.63 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) Maz 2016 <br /> t TFHd —Depth to Groundwater <br /> 100,000 p <br /> 10,000 8 <br /> F <br /> m b <br /> m <br /> 1,000 16 v <br /> 0 <br /> b o <br /> o <br /> CJ 100 24 $ <br /> TPHd:y=5E+09e� v <br /> Q <br /> 10 32 <br /> FIGURE <br /> Date C-55 <br /> Shell Stockton Terminal <br /> Shel3515 l <br /> Drive NM-23' <br /> Stockton,California TPHd Concentrations and <br /> 0 )VEM Depth to Groundwater <br /> &ASSOCIATES <br />