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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-9 <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 4.22E+21 <br /> Constant a -1.13E-03 <br /> Starting date for current trend: 8/27/2007 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 1.67 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Apr 2007 <br /> F- -4--TPHd —Depth to Groundwater <br /> 1,000 0 <br /> TPHd:y=4E+21ea <br /> F <br /> a <br /> t <br /> to <br /> 0 100 10 b <br /> m <br /> b <br /> a, <br /> c 3 <br /> v <br /> A <br /> 10 20 <br /> o ti <br /> �� ti� ti �� �� �� ti FIGURE <br /> Date C-17 <br /> Shell Stockton Terminal <br /> 3515 Navy Drive �X'� <br /> Stockton,California 7 TPHd Concentrations and <br /> CONESTOGA-ROVERS Depth to Groundwater <br /> &ASSOCIATES <br />