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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-21 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = bear ===> x=1n(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 (TPHd) <br /> Given <br /> WQO: y 210 <br /> Constant b 5.38E+08 <br /> Constant a -3.83E-04 <br /> Starting date for current trend: 6/15/1995 <br /> Calculate <br /> Attenuation Half Life(years): (-ht(2)/a)/365.25 4.96 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Jun 2005 <br /> --e–TPHd —Depth to Groundwater <br /> 10,000 0 <br /> TPHd:y=5E+08e-*E' <br /> AAA <br /> a 1,000 6 H <br /> eo v <br /> 3 m <br /> o 'o <br /> a <br /> b o <br /> 100 12 0 <br /> G <br /> U <br /> w <br /> a <br /> D <br /> 10 18 <br /> xr mr ash mr^ ar vms ar ar� ar v'r~ a <br /> � 1 � 1 1 1 1 1 1 � � 1 FIGURE <br /> Date C-49 <br /> Shell Stockton Terminal <br /> Shel3515 l <br /> Drive NIW-21. <br /> Stockton,California TPHd Concentrations and <br /> CONESTOGA-ROVERS Depth to GIoundwater <br /> 8.ASSOCIATES <br />