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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 /> Sampling TPHgIn TPHg Elapsed time since <br /> Date (pg/L) MIL) January 28,2005 i <br /> (years) Formula <br /> 01/28/05 5,100 8.54 0.00 <br /> 0627105 5,600 8.63 0.41 t <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 /> 03103/06 3,600 8.19 1.09 Ca=Cleanup level for contaminant of concern,pg/L . <br /> 0623/06 2,300 7.74 1.40 C, = Initial concentration of contaminant of concern,pg/L <br /> 09/15106 2,800 7.94 1.63 k�lm=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 ' <br /> 05/03/07 3,700 8.22 .2.26 Solutions <br /> 08/21/07 2,000 7.60 2.56 - <br /> 1129107 1,700 7.44 2.84 Cps b 100 Water Quality Objective(pglL) <br /> 0229108 3,300 8.10 3.09 Cp 593 Mean Concentration Last 4 Sampling Events(pg1L) <br /> 05r3aoe" 2,100 7.65 3.34 kw 0.2829 First Order Decay Rate(years") <br /> 0829108 - 1,600 7.38 3.59 Time to reach cleanup level 6.3 years <br /> .. 12/01/08 1,900 7.55. 3.84. - <br /> 03/02/09 2,700 7.90 4.09 CCL 100 . Water Quality Objective(pg/L) <br /> 06/01/09 3,100 8.04 4.34 Co b 720 Maximum Concentration Last 4 Sampling Events(pg/L) <br /> 69/11/09 1,800 7.50 4.62 krofk b 0.2829 First Order Decay Rate(years") <br /> 11/12/09 2,806 7.94 4.79 Time to reach cleanup level - 7.0 years <br /> 03/01/10 1,700 7.44 5.09 - - <br /> 06109/10 1,500 7.31 5.36 <br /> 09107/10 1,000 6.91 5.61 <br /> 12/13/10 450 6.11 5.88 - <br /> 02/14/11 720 6.58 6.05 <br /> 05109111 1,100 7.00 6.28 _0&15/11 870 6.77 6.55 <br /> 11/30/11 890 6.79 6.84 <br /> 02/13/12 -790 6.67 7.05 - <br /> 05/02/12 1,400 7.24 7.26 <br /> 0=9112 1,100 7.00 7.53 <br /> 11101112 700 6.55 776 . <br /> 02104/13 :280 5.63 8.02 !!„ <br /> 05103/13 720 6.58 8.27 <br /> 08/16/13 670 6.51 6.55 <br /> Mean last 4 Events 593 <br /> j <br /> TPHg Concentration vs Time in MW-3 <br /> Y=-0.2829x+8.7143 <br /> R1=0.7758 <br /> 10.00 <br /> =J 9.00 <br /> -6-In TPHg <br /> 8.00 - IPgIu <br /> c 7.00 -Linear(in TPHg <br /> 6.00 (10910 <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 />