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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-14 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be' ===> 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 6.24E+08 <br /> Constant a -3.35E-04 <br /> Starting date for current trend: 5/30/2003 <br /> Calculate <br /> Attenuation Half Life(years): (-ln(2)/a)/365.25 5.67 <br /> Estimated Date to Reach WQO: (x=In(y/b)/a) Oct 2021 <br /> t TPHd —Depth to Groundwater <br /> 10,000 0 <br /> TPHd:y=6E+08e-3� <br /> O <br /> E~ <br /> a w <br /> � w <br /> i itl <br /> 0 1,000 10 <br /> b C7 <br /> U <br /> Q <br /> 100 <br /> 20 <br /> FIGURE <br /> Date C-32 <br /> Shell Stockton Terminal MW-14: <br /> 3515 Navy Drive TPHd Concentrations and <br /> Stockton,California CpRUBSTOGA-ROVERS Depth to Groundwater <br /> 8.ASSOCIATES <br />