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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-15 <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 (1PHg) Benzene <br /> Given <br /> 41rQO: y 210 46 <br /> Constant b 2.47E+11 2.41E+21 <br /> Constant a -4.60E-04 -1.20E-03 <br /> Starting date for current trend: 10/28/1996 9/14/1999 <br /> Calculate <br /> Attenuation Half Life(years): (-ln(2)/a)/365.25 4.13 lab <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) May 2024 Oct 2003 <br /> tTPHg t13en ene —Depth to Groundwater <br /> 1,000,000.0 .x.wF - 0 <br /> TPHg:y=247E+i1e <br /> 100,000.0 3 <br /> 10,000.0 6 <br /> a <br /> 9 <br /> a 1,000.0 3 <br /> a 'd <br /> 0 12 <br /> 100.0 <br /> � C7 <br /> 0 <br /> 0 10.0 15 x <br /> V Benzene:y=2.41E+21e-120�• w <br /> 1.0 <br /> —— 18 A <br /> 21 <br /> 0.1 <br /> N <br /> 1� �,� .far 1xsA 1a` 1a' SO FIGURE <br /> Date C-36 <br /> Shell Stockton Terminal MW-15: <br /> 3515 Navy Drive N) TPHg and Benzene Concentrations <br /> Stockton,California 00N�'OGA-ROVE and Depth to Groundwater <br /> 6 ASSOCIATES <br />