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Point Decay Rate Constant&Timeframe to Achieve TPHg Water Quality Objective in Well MW-4 Using Data Since 2005 <br /> 7-Eleven Store#14117 <br /> 2725 Country Club Boulevard <br /> Stockton,California <br /> Sampling TPHg In TPHg Elapsed time since <br /> Date (pg/L) (Yg2) January 28,2005 <br /> (years) Formula <br /> 0128/05 1,300 7.17 0.00 <br /> 0627/05 350 5.86 0.41 t =-lln(C,/C,)]/kp,i,t <br /> 09/30/05 1,200 7.09 0.67 where; <br /> 12/09/05 1,300 7.17 0.86 t =Time to achieve cleanup levels,years <br /> 03/03/06 1,300 7.17 1.09 Cu=Cleanup level for contaminant of concern,pg/L <br /> 0623/06 960 6.87 1.40 C. = Initial concentration of contaminant of concern,pg/L <br /> 09/15/06 1,400 7.24 1.63 krad= First-order decay rate constant at one monitoring point,years" <br /> 12/01/06 1,200 7.09 1.84 =slope of the line,y <br /> 03/02/07 1,60D 7.38 2.09 <br /> 05/03/07 1,400 7,24 2.26 - Solutions <br /> 0821/07 1,50D 7.31 2.56 <br /> 1129107 1,200 7.09 2.84 CCL 100 Water Quality Objective(pg/L) <br /> 0229/08 1,100 7.00 3.09 C, b .598 Mean Concentration Last 4 Sampling Events(pg/L) <br /> 05/30/08 1,400 7.24 3.34 kp,iat .b 0.1142 First Order Decay Rate(years') <br /> 0829/08 1,200 7.09 3.59 Time to reach cleanup level 15.7 years <br /> 12/D1/08 1,100 7.00 3.84 <br /> 03/02/09 1,000 6.91. 4.09 Ccs. o .100 Water Quality Objective(pg/L) <br /> 06/01/09 1,000 6.91 4.34 C, b 960 Maximum Concentration Last 4 Sampling Events(pg/L). <br /> 09/11/09 610 6.41 4.62 kpd,t b 0.1142 First Order Decay Rate(years') <br /> 11/12/09 1,300 7.17 4.79 Time to reach cleanup level 20.0 years, <br /> 03/01/10 580 6.36 5.09 <br /> 06/09/10 780 6.66. 5.36 <br /> 09/07/10 3,300 8.10 5.61 <br /> 12/13/10 420 6.04 5.88 WOO=CA MCL,except for TPH-GRO,which is RWQCB ESL <br /> 02/14/11 790 6.67 6.05 <br /> 05/09/11 300 5.70 6.28 Additional CA MCLs: <br /> 08/15/11 980 6.89 6.55 Ethylbenzene=300 <br /> 11130/11 650 6.48 6.84 Toluene =150 <br /> 02/13/12 430 6.06 7.05 Total xylenes=1,750 r' <br /> 05/02/12 810 6.70 7.26 <br /> r , <br /> 08/09/12 980 6.89 7.53 <br /> 11/01/12 910 6.81 7.76 „- <br /> 02/04/13 280 5.63 8.02 7Ye s <br /> 05/03/13 220 5.39 8.27 <br /> Mean Last 4 Events 598 \''r <br /> y <br /> -0.1 142x+7.2689 TPHg Concentration vs Time in MW-4 <br /> R'=0.2396 <br /> i <br /> 9.00 <br /> i <br /> 8.00 ---InTPHg <br /> r <br /> (pg/L) <br /> 7.00 7.00 <br /> 6.00 - <br /> -Linear(In TPHg <br /> - <br /> (Y9/L)) <br /> 5.00 <br /> 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 <br /> Time since 2005(years) <br /> I , <br />