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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-25 <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 3.98E+02 <br /> Constant a -3.95E-05 <br /> Starting date for current trend: 5/30/2006 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 48.03 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Apr 1944 <br /> tTPHd —Depth to Groundwater <br /> 1,000 0 <br /> TPHd:y=397.76e- - <br /> O <br /> F <br /> mON � <br /> 0 100 5 <br /> n <br /> m <br /> � o <br /> v <br /> O <br /> 10 10 <br /> -y O <br /> FIGURE <br /> Date C-6^ <br /> Shell Stockton Terminal <br /> Shell <br /> 3515 Navy Drive <br /> Shxkton,Cahfomia TPHd Concentrations and <br /> CYVERS Depth to Groundwater <br /> &ASSOCIATES <br />