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.AO <br /> Predicted Time to Water Quality Objectives in Well S-3-84 <br /> Shell-Branded Service Station,2494 East Fremont Street,Stockton,California <br /> y = b e" ===' 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 /> 1,2-Dichloroethane <br /> Constituent (1,2-DCA) <br /> Given <br /> Water Quality Objective(WQO): y 0.5 <br /> Constant: b 2.46E+13 <br /> Constant: a -7.26E-04 <br /> Starting date for current trend: 12/30/2003 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 2.61 <br /> Estimated Date to Reach WQO: (x=In(y/b)/a) Oct 2018 <br /> f 1,2-DCA —Depth to Groundwater <br /> 100.0 39 <br /> eo <br /> j 10.0 - -- 46 v <br /> i 3 <br /> a <br /> n o <br /> 1.0 - _. _. _ - 53 0 <br /> a a <br /> O 1,2-DCA=2.46E+13e-1.11 - q <br /> 0.1 60 <br /> Date <br /> SHELL-BRANDED SERVICE STATION 53-84:1,2-DCA CONCENTRATIONS AND <br /> 2494 EAST FREMONT STREET DEPTH TO GROUNDWATER <br /> STOCKTON,CALIFORNIA <br /> 6 ASS=ATEB <br />