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i <br /> Predicted Time to Cleanup of Benzene in Well MW-2, 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 /> Days from Predicted <br /> y = b e" x=In(ylb)I a Date First Sample Concentration(ug/1) <br /> €1/2211993 0 889 <br /> 11122/1994 365 574 <br /> Given 11122/1945 730 370 <br /> Water Quality Objective y 1 ug/L 11121/1996 l 095 239 <br /> Constant b $$9 4 €1121!1997 1 460 154 <br /> Constant a 0 0412 11121/1998 1 825 100 <br /> Date of first sample l€!2211943 11121/1999 2 190 64 <br /> 11/20/2040 2 555 41 <br /> 11/2012001 2 920 27 <br /> 11120!2002 3 285 17 <br /> 11/2012003 3 650 11 <br /> Calculate 11/19/2004 4 015 7 <br /> Days from first sample x 5 654 Days 11119/2005 4 380 5 <br /> Years from first sample 15 5 Years Calculated Half Life= In(2)/a 11/19/2006 4 745 3 <br /> Estimated date of cleanup May 2009 1 578 Days 11/1912007 5 110 2 <br /> 1 58 years 11/18/2008 5 475 1 <br /> 11/1812009 5 840 1 <br /> Predicted Concentrations <br /> 1000 <br /> 3' ss=sN a" A4'�g 10z! <br /> 100 <br /> i-fx yn°9`yWi^r P°"�s t€� rol:rN, 3 Ea.s waE <br /> 2 f <br /> i"3di�e Y A <br /> 10 _a <br /> 1 <br /> rn m a o <br /> tv N <br /> I - <br /> Degradalte Calculations xis MW 2 Benzene Pred • <br />