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i <br /> Predicted Time to Cleanup of TPHg in Well MW-2, Shell-Branded Service Statlont 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=ln(ylb)1 a Date First Sample Concentration(ug/1) <br /> 11/22/1993 0 58 999 <br /> 11122/1994 365 39 489 <br /> Given 1112211995 710 26 431 <br /> Water Quality Objective y 50 ug/L 11121!1996 1 095 17 690 <br /> Constant b 58999 11/21/1997 1460 11840 <br /> Constant a 0 OQl l 11/21/1998 1 825 7 925 <br /> Date of first sample l 1122/1993 11/21/1999 2 190 5 304 <br /> 11120/2000 2 555 3 550 <br /> 1112012001 2 920 2 376 <br /> 11/2012002 3 285 1 590 <br /> 11/20/2003 3 650 1 065 <br /> Calculate 11/19/2004 4 015 712 <br /> Days from first sample x 6 430 Days 11/19/2005 4 380 477 <br /> Years from First sample 17 6 Years Calculated Half Life= In(2)/a 11/19/2006 4 745 319 <br /> Estimated date of cleanup Jul 2031 630 Days 11/19/2007 5 110 214 <br /> 1 73 years 1111812009 5 475 143 <br /> 11/1812009 5 840 96 <br /> 11/18/2010 6 205 64 <br /> 11/18/2011 6 570 43 <br /> Predicted Concentrations _.._ <br /> 100 000 <br /> NV <br /> 10 000 - <br /> ` <br /> APARK <br /> 1 000 n� ` � g --F� :3� <br /> Aro of <br /> 711 <br /> 100 i ti res a <br /> W� R� � <br /> 10 <br /> r7 m mco <br /> p rn 0 0 <br /> m O 0 0 <br /> C4 N <br /> Degradaote Calculations xis?AW 2 TPHg Pred <br />