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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-14 <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 (TPHg) Benzene <br /> Given <br /> WQO: y 210 46 <br /> Constant b 5.08E+05 7.04E+01 <br /> Constant a -1.80E-04 4.81E-05 <br /> Starting date for current trend: 5/31/2001 12/20/1999 <br /> Calculate <br /> Attenuation Half Lifeears a <br /> (y : 2 <br /> -ln) ( ( )/ )/365.25 10.53 3 .4E <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) May 2018 Below WQO <br /> t TPHg Benzene —Depth to Groundwater <br /> 10,000.0 p <br /> TPHg:y=5.08E+05e'180� <br /> 1.000.0 4 U <br /> O <br /> H <br /> a <br /> 100.0 8 <br /> A <br /> 0 3 <br /> p b <br /> C 10.0 12 0 <br /> a ° <br /> V 1.016 v <br /> Benzene:y=7.04E+01e-81�- Q <br /> 0.1 20 <br /> � FIGURE <br /> Date C-33 <br /> Shell Stockton Terminal3515 Mvy Drive W-14: <br /> Stockton, <br /> Stockton,California TPHg and Benzene Concentrations <br /> CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />