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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-2 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b4?' ===> x=In(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 6.83E+06 NA <br /> Constant: a -2.79E-04 NA <br /> Starting date for current trend: 3/24/1998 NA <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 6.79 NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) Oct 2001 Below WQO <br /> tTPHgtBenzme —Depth to Groundwater <br /> 1,000.0 0 <br /> TPHg:y=6.83E+06e-rEoix <br /> 100.0 4 <br /> a v <br /> m m <br /> r 8 b <br /> 10.0 <br /> m 0 <br /> G o <br /> m <br /> U 1.0 12 <br /> A <br /> 0.1 <br /> 16 <br /> NO 1zr 1xr ti'Ar FIGURE <br /> Date C-6 <br /> Shell Stockton Terminal MW-2: <br /> 3515 Navy Drive TPHg and Benzene Concentrations <br /> Stockton,California CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />