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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-23 <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 /> Gasoline <br /> Constituent (TPHg) Benzene <br /> Given <br /> WQO: y 210 46 <br /> Constant: b 6.72E+15 NA <br /> Constant: a -7.81E-04 NA <br /> Starting date for current trend: 3/24/1998 NA <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 2.43 NA <br /> Estimated Date to Reach WQO: (x=In(y/b)/ a) Dcc 2008 Below WQO <br /> tTPHg tBI=ene —Depthto Groundwater <br /> 100,000.0 0 <br /> TPHg:y=6.72E+15e'7-EE' <br /> 10,000.0 5 <br /> O <br /> E <br /> a 1,000.0 10 w <br /> 3 m <br /> 0 100.0 15 <br /> m <br /> 0 <br /> c 10.0 20 0 <br /> V o. <br /> 1.0 25 A <br /> 0.1 30 <br /> FIGURE <br /> Date C-56 <br /> Shell Stockton Terminal ® MW-23: <br /> 3515 Navy Drive <br /> TPHg and Benzene Concentrations <br /> Stockton,California <br /> CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />