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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-11 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b e°` ===' x=1n(}'/b)/a <br /> where: y=concentration in ttg/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 3.15E+10 <br /> Constant a 4.18E-04 <br /> Starting date for current trend: 3/29/1999 <br /> Calculate <br /> Attenuation Half Life(years): (-ht(2)/a)/365.25 1.54 <br /> Estimated Date to Reach WQO: (x=In(y/b)/a) Maz 2023 <br /> t TPHd —Depth to Groundwater <br /> 1,000,000 <br /> 0 <br /> TPHd:y=3E+10e� <br /> 100,000 <br /> 8 <br /> F <br /> m r. <br /> w <br /> 10,000 16 b <br /> o <br /> b <br /> o <br /> u C7 <br /> U 11000 24 <br /> a <br /> v <br /> O <br /> 100 32 <br /> 95 9^ d'' oti o'� p5 A� Aq titi `g <br /> FIGURE <br /> Date C-^^ <br /> Shell Stockton Terminal L`-JG <br /> 3515 Navy Drive MW-11: <br /> Stockton,California 777 TPHd Concentrations and <br /> co )VIERS Depth to Groundwater <br /> &ASSOCIATES <br />