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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-13R <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be a. ===> 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 /> Gasoline <br /> Constituent (TPHg) Benzene <br /> Given <br /> WQO: y 210 46 <br /> Constant b 1.84E+08 8.34E+09 <br /> Constant a -2.79E-04 -4.36E-04 <br /> Starting date for current trend: 3/29/1999 3/20/1996 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 6.SO 4.35 <br /> Estimated Date to Reach WQO: (x=1n(y/b)/a) Mar 2034 .Apr 2019 <br /> -All--TPHg I Bemene —Depth to Groundwater <br /> 1,000,000 0 <br /> TPHg:y=1.84E+08e-219a ' <br /> 100,000 3 e <br /> O <br /> a 10,000 6 <br /> m � <br /> 3 3 <br /> 0 1,000 9 .a <br /> m 0 <br /> 0 <br /> 100 12 U <br /> G s <br /> U° <br /> w <br /> A <br /> Benzene:y=8.34E+0%4+36Ea. <br /> 1 18 <br /> FIGURE <br /> Date C_30 <br /> Shell Stockton Terminal X1W-13R: <br /> 3515 Navy Drive <br /> Stockton,California TPHg and Benzene Concentrations <br /> CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />