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Predicted Time to Cleanup of Benzene in Well MW-9,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°` In(y1b)I a Date First Sample Concentration(ug/l) <br /> 10/24/1990 0 7 536 <br /> 10/24/1992 731 3 372 <br /> Gnen 10/24/1994 1461 1511 <br /> Water Quality Objective y I ug1L 10/24/1996 2 192 676 <br /> Constant b 7536 2 10/24/1998 2 922 303 <br /> Constant a 0 001 l 10/24/2000 3 653 136 <br /> Date of first sample i0124l199D 10/24/2002 4,383 61 <br /> 10/23/2004 5 113 27 <br /> 10/23/2006 5 843 12 <br /> 10/22/2008 6 573 5 5 <br /> 10/22/2010 7 303 24 <br /> Calculate 10/21/2012 8 033 1 1 <br /> Days from first sample x 8 116 Days 10/21/2014 8 763 0 5 <br /> Years from first sample 22 2 Years Calculated Half Life= In(2)/a <br /> Estimated date of cleanup Jan-2013 630 Days <br /> 1 73 years <br /> Predicted Concentrations <br /> 10 000 <br /> 1 000 7, <br /> rn 100 <br /> t ` ... ° <br /> t 9� <br /> 0 10 0 L o <br /> M o 0 <br /> rn m 0 o a <br /> N N N <br /> Degradation Rate Calculations As MW 9 Benzene Pred <br />