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• • 0 <br /> Predicted Time to Cleanup of TPH9 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" x=ln(ylb)I a Date First Sample Concentration(ug 1) <br /> 10/30/1991 0 59 460 <br /> 1030/1993 73I 15 645 <br /> Given 10/30/1995 1 461 21 383 <br /> Water Quality Objective y 50 ug/L 10130/1997 2 192 12 819 <br /> Constant b 59460 10,30'1999 2922 1690 <br /> Constant a -00007 10/302001 3 653 4 6t0 <br /> Date of first sample 10/30/1991 10130/2003 4 363 2'6s <br /> 10/29/2005 5 111 1 659 <br /> 10/29/2007 5 843 995 <br /> 10128!2009 65'3 597 <br /> 102&2411 7 301 358 <br /> Caiculate 10'27n1313 8033 215 <br /> Days from first sample x 10 116 Days 1 0127'2015 8 763 129 <br /> Years from first sample 27 7 Years Calculated Half Life— In(2)1a 10/26/2017 9 493 .7' <br /> Estimated date of cleanup Jul-2019 990 Days 10/26/2019 10 223 46 <br /> 2_71 Iyears <br /> Predicted Concentrations <br /> 100 000 <br /> 10 000 <br /> I <br /> m 1000 <br /> 100 <br /> r <br /> 3 <br /> 10 <br /> E0 m <br /> rn m o a <br /> rn m N oC3 C3 <br /> •- �^ N N N N <br /> Degradation Rale Calculatiors As MW 9 TPHg Pred <br />