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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-22 <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 /> Diesel <br /> Constituent (MHd) <br /> Given <br /> WQO: y 210 <br /> Constant: b 1.22E+07 <br /> Constant a -2.26E-04 <br /> Starting date for current trend: 3/24/1994 <br /> Calculate <br /> Attenuation Half Life(years): (-ln(2)/a)/365.25 8.41 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Jan 2033 <br /> t TPHd —Depth to Groundwater <br /> 100,000 0 <br /> TPHd:y=1E+07e-2E' O <br /> F <br /> :a 10,000 6 <br /> m <br /> �7U <br /> � 1,000 12 8 <br /> 0 <br /> a <br /> a <br /> Q <br /> 100 18 <br /> ar 5 mr as f ti ar LA0 ac at` mr <br /> ti � 1 1 1 1 1 1 FIGURE <br /> Date C-52 <br /> Shell Stockton Terminal <br /> 3515 Navy Drive N W-22: <br /> Stockton,California TPHd Concentrations and <br /> coYVERS Depth to Groundwater <br /> &ASSOCIATES <br />