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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-3 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b e81 ===> 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 5.01E+07 <br /> Constant a -2.81E-04 <br /> Starting date for current trend: 8/16/2004 <br /> Calculate <br /> Attenuation Half We(years): (-ln(2)/a)/365.25 6.76 <br /> Estimated Date to Reach WQO: (x=In(y/b)/a) Sep2020 <br /> t TPHd —Depth to Groundwater <br /> 10,000 5 <br /> TPHd:y=5E+07e-ME <br /> aE7i U_ <br /> O <br /> F <br /> 1,000 10 <br /> � <br /> 3 <br /> G C <br /> O ❑ <br /> m � <br /> 100 15 8 <br /> t5 <br /> U � <br /> 20 <br /> 10 <br /> 1ms 1 far � FIGURE <br /> Date C_Q <br /> Shell Stockton Terminal MW'3 <br /> 3515 Navy Drive TPHd Concentrations and <br /> Stockton,California CONMGA_ROVERS Depth to Groundwater <br /> &ASSOGATES <br />