Laserfiche WebLink
I <br /> Point Decay Rate Constant&Timeframe to Achieve TPHg Water Quality Objective in Well MW4 Using Data Since 2005 <br /> 7-Eleven Store#14117 <br /> 2725 Country Club Boulevard <br /> Stockton,California <br /> I Sampling TPHg In TPHg. Elapsed time since y <br /> Date January 28,2005 <br />/ (pg/L) (pg/L) (years) Formula. / <br /> 0128/05 1,300 7.17 O.OD 7 <br /> 0627/05 350 5.56 0,41 l =-pn(C./Co))/kr„M <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 /> D3/03/06 1,306 7.17 1.09 CcL=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 ' lc,.= First-order decay rate constant at one monitoring point,years" <br /> 12/07/06 1,200 7.09 1.84 <br /> =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 1,500 7.31 2.56 <br /> 1129/07 1,200 7.09 2.84 CCL 100 Water Quality Objective(pg1L) <br /> 0229/08 1,100 7.00 3.09 Co 59B Mean Concentration Last 4 Sampling Events(pg/L) <br /> 05/30/08 1,400 7.24 3.34 kpein, y 0.1142 First Order Decay Rate(years') <br /> 0829/08 1,20D 7.09 3.59 Time to reach clianuip level 15.7 ears <br /> 12/01108 1,100 7.00 3.84 <br /> 03/02/09 1,000 6.91 4.09 CCL 100 Water Quality Objective(pg/L) <br /> 06/01/09 1,000 6,91 4.34- Co b 980 Maximum Concentration Last 4 Sampling Events(pg/L) <br /> 09/11/09 61D 6.41 4.62 kp�„r y 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 /> 03101/10 580 6.36 5.09 <br /> 06/09/10 780 6.66 5.36 <br /> 09/07/10 3,300 8.10 5.61 - <br /> 12/13110 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 Elhylbenzene=300 <br /> 11/30/11 650 6.48 6.84 Toluene =150 <br /> 02/13/12 430 6.06 7.05 Total Xylenes=1,750 <br /> 05/02/12 810 6.70 7.26 <br /> 08109/12. 986 6.89 7.53 <br /> 11/01/12 910 6.81 7.76 '`+' <br /> 02/04/13 280 5.63 8.02 <br /> 05/D3/13 220 5.39 8.27 <br /> Mean Last 4 Events 598 <br /> -0.1142x+7.2689 TPHg Concentration vs Time in MW-4 <br /> R'=0.2396 <br /> 9.00 t. <br /> c� 6•�� - In TPHg <br /> m Z 7.00 1 <br /> F _ 6.00 -Linear(In TPHg <br /> (NgIL)) <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 post-remediation sampling began (years) <br />