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�.. ti/ <br /> Predicted Time to Water Quality Objectives in Well S4 <br /> Shell-Branded Service Station,2494 East Fremont Street,Stockton,California <br /> y = be`' ===> x=1n(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+05 <br /> Constant: a -4.49E-04 <br /> Starting date for current trend: 5/1/2002 <br /> Calculate <br /> Attenuation Half Life(years): (-ln(2)/a)/365.25 4.23 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) F Feb 2022 <br /> rt1,2-DCA —Depth to Groundwater <br /> 100.0 -. .--._-._ - 39 <br /> eo <br /> j 10.0 -- <br /> a c <br /> 0 7 <br /> � o <br /> ro .. <br /> b 1.0 _ _. _. __._. ----.__ 53 0 <br /> v <br /> G XJ <br /> U v <br /> O <br /> 1,2-DCA=2.46E+0&4.498' <br /> 0.1 60 <br /> Date <br /> SHELL-BRANDED SERVICE STATIONS-4:1,2-DCA. S-4:1,2-DCA CONCENTRATIONS AND DEPTH <br /> 2494 EAST FREMONT STREET `��� TO GROUNDWATER <br /> STOCKTON,CALIFORNIA CONESTO(SA-ROVERS <br /> &ASSOCIATES <br />