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Predicted Time to Reach Water Quality Objective (WQO) in Well NM-24 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b eax ===> 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 2.19E+06 <br /> Constant. a -1.71E-04 <br /> Starting date for current trend: 3/24/1995 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 11.09 <br /> Estimated Date to Reach WQO: (x=In(y/b)/a) Dec 2047 <br /> tTPHd —Depth to Groundwater <br /> 100,000 0 <br /> U <br /> O <br /> f- <br /> 10,000 <br /> 10,000 4-r <br /> 15 <br /> 3 � <br /> o 'd <br /> 0 <br /> 1,000 30 $ <br /> a <br /> a <br /> TPHd:y=2E+06e-'F-04i O <br /> 100 45 <br /> 0. ti O ry <br /> FIGURE <br /> Date C-58 <br /> Shell Stockton Ternvnal MW-24: <br /> Navy Drive <br /> Stockton, <br /> ` <br /> Stockton,California TPHd Concentrations and <br /> colvEsrocan p )VERS Depth to Groundwater <br /> &ASSOCIATES <br />