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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-24 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be' ===> 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 9.17E+08 3.57E+04 <br /> Constant a -2.75E-04 -5.43E-05 <br /> Starting date for current trend: 1/25/2001 11/6/2003 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 6.90 34.91 <br /> Estimated Date to Reach WQO: (x=In(y/b)/ a) Apr 2052 Jun 2235 <br /> tTPHg -e-Benzene —Depth to Groundwater <br /> 10,000,000 0 <br /> TPHg:y=9.17E+08e-'tee <br /> 1,000,000 5 <br /> 100,00010 O- <br /> a �- <br /> i 10,000 15 <br /> o 'VOW <br /> d <br /> .� 1,000 20 <br /> G 2 <br /> a U <br /> G 100 25 8 <br /> o �r <br /> U Benzene:y=3.57E+04e-s.a3e-0s. <br /> 10 30 Q <br /> 1 35 <br /> 50 arh <br /> S a arA~ a A� ac arp^ arAQ xs~ ark <br /> 1 1 1 1 1c 1 1 FIGURE <br /> Date C-59 <br /> Shell Stockton Termmal }.\ MW-24: <br /> 11 <br /> Stockton,California <br /> 3515 Navy Drive'-' TPHg and Benzene Concentrations <br /> CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />