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Predicted Time to Water Quality Objectives in Well S-1-85 <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 1.48E+11 <br /> Constant a -6.14E-04 <br /> Starting date for current trend: 12/30/2003 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 3.09 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) r Oct 2017 <br /> t 1,2-DCA —Depth to Groundwater <br /> 1,000.0 40 <br /> 100.0 45 <br /> a b <br /> to <br /> to � <br /> 3 10.0 50 b <br /> o <br /> l7O <br /> 1.0 7r�� - ___. 55 8 <br /> G <br /> V 1,2-DCA=1.48E+11ed.14s v <br /> 0.1 60 O <br /> la ti 1 1 1 1 1 1 1 ti 1 1 <br /> Date <br /> SHELL,BRANDED SERVICE STATION �; ,�h 51-85:1,2-DCA CONCENTRATIONS AND <br /> 2494 EAST FREMONT STREET `=^ DEPTH TO GROUNDWATER <br /> STOCKTON,CALIFORNIA cotrooa.-wavens <br /> a nssoanres <br />