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�./ <br /> Predicted Time to Water Quality Objectives in Well S-6 <br /> Shell-Branded Service Station,2494 East Fremont Street,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 /> Methyl Tertiary 1,2-Dichloroethane <br /> Constituent Butyl Ether(MTBE) (1,2-DCA) <br /> Given <br /> Water Quality Objective(WQO): y 5 0.5 <br /> Constant: b 4.32E+08 1.59E+14 <br /> Constant: a -4.23E-04 -7.87E-04 <br /> Starting date for current trend: 6/5/2007 9/17/2007 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 4.48 2.41 <br /> Estimated Date to Reach WQO: (x=1n(y/b)/ a) Mar 2018 Mar 2016 <br /> --0-1,2-DCA —e--MTBE --Depth to Groundwater <br /> 1,000.0 40 <br /> Y=4.3213+0&4.ME' . <br /> 100.0 <br /> m m <br /> 10.0 50 v <br /> n° <br /> C C7 <br /> 1.0 $ <br /> o ,moi <br /> O 1,2-DCA 1.59&14e-7.E x Q <br /> 0.1 60 <br /> Date <br /> SHELL-BRANDED SERVICE STATION S-6:MTBE AND 1,2-DCA CONCENTRATIONS <br /> 2494 EAST FREMONT STREET AND DEPTH TO GROUNDWATER <br /> STOCKTON,CALIFORNIA porasnouw-ravens <br /> a nssodn�s <br />