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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-20 <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: 210 46 <br /> Constant: b 1.19E+08 5.02E+11 <br /> Constant a -2.79E-04 -5.64E-04 <br /> Starting date for current trend: 8/12/1996 8/12/1996 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 6.81 3.37 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Feb 2030 Mar 2012 <br /> –H–TPHg +Benzene —Depth to Groundwater <br /> 100,000.0 0 <br /> TPHg:y=1.19E+08e-'�E Benzene:y=5.0213+110-64E-04- <br /> 10,000.0 2 <br /> O <br /> a 1,000.0 4 <br /> 2 <br /> i m <br /> 100.0 6 b <br /> 'b <br /> m <br /> b o <br /> 10.0 8 0 <br /> G <br /> U � <br /> 1.0 i4h10 <br /> 0 A <br /> 0.1 12 <br /> FIGURE <br /> Date C-47 <br /> Shell Stockton Terminal O <br /> 3515 Navy Drive MW-20: <br /> r�{' <br /> Stockton,California t TPHg and Benzene Concentrations <br /> CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />