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I � , <br /> Point Decay Rate Constant&Timeframe to Achieve TPHg Water Quality Objective in Well MW-3 Using Data Since 2005 <br /> 7-Eleven Store#14117 <br /> 2725 Country Club Boulevard <br /> Stockton,California <br /> i <br /> Sampling TPHg In TPHg Elapsed time since _ <br /> Date (pg/L) fpg/L) January28,2005 <br /> (years) Formula <br /> 01/28/05 5,100 8.54 0.00 <br /> 06/27/05 5,600 8.63 0.41 t =41n(CcL/C,))/kph <br /> 09/30/05 9,200 9.13 .0.67 where: <br /> 12/09/05 8,900 9.09 0.86 t = Time to achieve cleanup levels,years - <br /> 03/03/06 3,600 8.19 1.09 CCL= Cleanup level for contaminant of Concern,pg/L <br /> - 06/23/06 2,300 7.74 1.40 C, = Initial concentration of contaminant of concern,pg/L <br /> 09/15/06 2,800 7.94 1.63 kp�= First-order decay rate constant at one monitoring point,years" <br /> 12/01/06 4,000 8.29 1.84 = slope of the line,y <br /> 03/02/07 3,600 8.19 2.09 - e <br /> 05/03/07 3,700 8.22 2.26 Solutions -- - <br /> 08/21/07 2,000 7.60 2.56 <br /> 11/29/07 1,700 7.44 2.84 CCL. .b 100 Water Quality Objective(pg/L) <br /> 02/29/08 3,300 8.10 3.09 Co -:, 700 Mean Concentration Last 4 Sampling Events(pg/L) <br /> 05/30/08 2,100 7.65. 3.34 kpomt b 0.2875 First Order Decay Rate(years") <br /> 08/29/08 1,600 7.38 3.59 Time to reach cleanup level 6.6 years <br /> 12/01/08 .1,900. 7.55 3.84 - <br /> 03/02/09 .2,700 7.90 4.09 COL .b 100 Water Quality Objective(pg1L) <br /> 06/01/09 3,100 8.04 4.34 Co b- 1,100 Maximum Concentration Last 4 Sampling Events(pg/L) <br /> 09/11/09 1,800 7.50 4.62 0.2875 First Order Decay Rate(years") <br /> 11/12/09 2,800 7.94 4.79 Time to reach cleanup level 8.3 years <br /> 03/01/10 1,700 7.44 5.09 - <br /> 06/09/10 1,500 7.31 5.36 - <br /> 09/07/1O� 1,000 6.91 5.61 - <br /> 12/13/10 450 6.11 5.88 - WQO=CA MCL,except for TPH-GRO,which is RWQCB ESL <br /> 02/14/11 720 - 6.58 6.05 - <br /> 05/09/11 1,100 7.00 6.28 Additional CA.MCLs: - <br /> 08/15/11 870- 6.77 6.55. Elhylbenzere=300 <br /> 11/30/11 .890 6.79. 6.84 Toluene =150 <br /> 02/13/12 790 6.67 7.05 Total Xylenes=1,750 <br /> 05/02/12 1,400 7.24 7.26 <br /> 08/09/12 1,100 '7.00 7.53 <br /> 11/01/12 700 6.55 7.76 <br /> 02/04/13 280 5.63 8.02 <br /> 05/03/13 720 6.58 8.27 <br /> Mean Last 4 Events - 700 <br /> TPHg Concentration vs Time in MW-3 <br /> Y=-0.2875x+8.7275 <br /> R'=0.7678 <br /> 10.00 <br /> 9.00 <br /> N 2 8.00 <br /> c rn <br /> m"2 7.00 <br /> -Linear(In TPHg <br /> 6.00 tp9/u) <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 />