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Predicted Time to Cleanup of Benzene in Well MW-7,Shell-Branded Service Station, 620 Charter Way, Stockton, California <br /> Concentration Trend Prediction <br /> Calculate"time to cleanup"given the first order decay equation <br /> Day s from Predi ctJ <br /> y = b e" _y x=In(ylb)1 a Date First Sample Concentration(ug 1) <br /> 4!2611991 0 713 <br /> 412511992 365 ail <br /> Given 4!2511993 710 154 <br /> Water Quality Objective y 1 ug1L 4/25/1994 1 095 71 <br /> Constant b 712 56 4/25/1995 1 460 33 <br /> Constant a 0 0021 4!2411996 1 825 15 <br /> Date of first sample 4126!1991 4/24/1997 2 190 7 <br /> 4!2411998 2 555 3 <br /> 4/2411999 2 920 2 <br /> 4/2312000 3 285 1 <br /> Calculate <br /> Days from first sample x 3 128 Days <br /> Years from first sample 8 6 Years Calculated Half Life= In(2)'a <br /> Estimated date of cleanup Nov 1999 330 Days <br /> 0 90 years <br /> Predicted Concentrations <br /> 1000 <br /> 100 <br /> Z } <br /> «1 <br /> 10 <br /> a <br /> � 1 <br /> C rn m O <br /> W OI 6/ OI 07 <br /> Degradation Rake Calculations As MW 7 Benzene Pred <br />