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i <br /> J I <br /> Table 3: MW-8 Natural Attenuation Estimate <br /> Valentine(Castle Motors) <br /> Project No.723.2 <br /> (2) (3) (4) (5) (6) ..(7) .. <br /> Reported First Order Decay Apply 300%factor of <br /> MW-8 Benzene (Estimated) safety <br /> Benzene Time Date Time Date - <br /> (pg/L) (pg/L) (days)- (mm/dd/yyyy) (days) (mrrVdd/yyyy) <br /> 03/23/04 73 13 0- 03/23/04 0 03/23/04 <br /> 05/06/04 12 12 44 05/06/04 57 05/19/04 - <br /> 08/06/04 9 12 136 08/06/04 177 09/15/04 <br /> 02/01/05 13 10 315 02/01/05 1 410 05/06/05 <br /> _04/13/05 6 10 386 04/13/05 502 08/06/05 <br /> 08/26/05 _ 9 _ 521 _ 08/26/05 677 01/29/06 <br /> 11/19/05 9 9 606_ _11/19/05 788 05/19/06 <br /> 01/17/06 10 8 665 - 01/17/06 865 08/04/06 <br /> 04/17/06 6 e 755 04/17/06 982 11/29/06 _ <br /> 07/07/06 9 8 836 07/07/06 1087 03/14/07 <br /> 10/23/06 9 7 944 10/23/06 1227 08/02/07 <br /> 01/19/07 77 7 1032 01/19/07 1342 11/24/07 <br /> 04/12/07 8 6 1115 04/12/07 1450 03/11/08 <br /> 07/23/07 6 6 1217 07/23/0 1582 07/22/06 <br /> _10/22/07 6 6 1308 _ 10/22/07 1700 11/17/08 <br /> _ 01/19/08 'N_D<40 _ 5 1397 .01/19/08 1816 03/13/09 <br /> 04/07/08 5 5 1476 04/07/08 1919 06/23/09 <br /> 07/03/08 4.7 5 1563 07/03/08 2032 10/14/09 <br /> 10/28/08 7.7 5 1680 10/28/06 2164 03/16/10 . <br /> 01115/09 4.6 4 1759 01/15/09 2287 06/26/10 <br /> .07115109 ND<5 4 1940 07/15/09 2522 02/17/11 <br /> 01/26/10 _ 3.2 3 2135- 01/26/10 2776 10/28/11 <br /> 07/30/10 - 2.1 �3 _2320 07/30/10 3016 06/25/12 <br /> 02/01/11 2.1 3 2506 _02101/11 3258 02/21/13 <br /> 03/03/12 3 2 2902 03/03/12 3773 07/21/14 <br /> 2 3000 06/09/12 3900 11/26/14 <br /> 2 3200 12/26/12 1 4160 08/13/15 <br /> 2 3400 07/14/13 4420 04/29/16 <br /> 1 3600 01/30/14 4680 01/14/17 <br /> 1 380008/18/14 4940 10/01/17 <br /> 1 4000 03/06/15 5200 06/18/18 <br /> 1 4200 09/22/15 5460 03/05/19 <br /> 1 4400 - 04/09/16 5720 11/20/19 <br /> 1 4600 10/26/16 5980 08/06/20 <br /> 1 4800 05/14/17 6240 04/23/21 <br /> '1 5000 11/30/17 6500 01/08/22 <br /> '1 5200 06/18/18 6760 09/25/22 <br /> 0 5400 01/04/19 7020 06/12/23 <br /> (1) Date of Sample Collection ' <br /> (2) Reported Concentration of Contaminant of Concern <br /> -(3) Time elapsed in days <br /> (4) Estimated concentration using first order decay function(Figure 3) , <br /> 12.53 x e^(-0.0006'(3)) _ <br /> (5) Date that corresponds to the days elapsed(3) - <br /> (6) Apply 30%factor of safety(as approp.based on Rz)to days elapsed(3) <br /> (7) Dale that corresponds to the days elapsed with factor of safely(6) <br />