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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-37 <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 (PPHg) Benzene <br /> Given <br /> WQO: y 210 46 <br /> Constant b 3.89E+16 2.54E+24 <br /> Constant a -7.52E-04 -1.26E-03 <br /> Starting date for current trend: 5/7/2009 5/7/2009 <br /> Calculate <br /> Attenuation Half Life(years): (-ln(2)/a)/365.25 2.52 1.51 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Jul 2019 Jan 2014 <br /> X-TPHg - Benzene —Depth to Groundwater <br /> 10,000 p <br /> TPHg:y=3.89E+16e,7.M� U <br /> O <br /> F <br /> 1,000 4 <br /> iBenzene:y=2.54E+24e-LMr - <br /> m <br /> o b <br /> m <br /> b o <br /> 100 8 C7 <br /> G � <br /> U 3 <br /> a <br /> v <br /> P <br /> 10 12 <br /> a o ti l <br /> -Sf FIGURE <br /> Date <br /> C-68 <br /> Shell Stockton Terminal MW-37� <br /> Stockton California 8 Navy Drive TPHg and Benzene Concentrations <br /> Stockton, <br /> CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />