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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-29 <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 3.39E+08 <br /> Constant a -3.64E-04 <br /> Starting date for current trend: 8/19/2002 <br /> Calculate <br /> Attenuation Half Life(years): (-ht(2)/a)/365.25 5.22 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Aug 2007 <br /> --*—TPHd —Depth to Groundwater <br /> 1,000 10 <br /> O <br /> H <br /> m Et <br /> 3 m <br /> 100 15 <br /> b <br /> U <br /> 8 <br /> U TPHd:y =3E+08e"'r -a <br /> w <br /> v <br /> 10 20 <br /> Ao ar~ arAry ar a's ac a'S ar� ar �A9 aro art airy ar'S <br /> 1 1 1 1 S ti ti 1 1 1 1 FIGURE <br /> Date <br /> C-63 <br /> Shell Stockton Terminal NM-29- <br /> 3515 Navy Drive <br /> Stockton,California TPHd Concentrations and <br /> conffsrpGq_aOVEnS Depth to Groundwater <br /> &ASSOCIATES <br />