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Table 2 Historical Groundwater Monitoring and Analytical Data 7-Eleven Store#14117 2725 Country Club Boulevard Stockton,CA Well ID/ Ethyl- MtBE 1,2- Meth- Eth- Ace- Dissolved Elevation Date Benzene Toluene Benzene Xylene TPH9 8020 MtBE TBA DIPE EtBE TAME DCA EDB anol enol tone Notes Oxygen DTW SPT WTE TOC /L /L L /L IL /L /L IL IL IMILL /L /L /L IL .29.61. IL _='_LL feet feet feet MW-8 1.90 09/18/03 25 130 64 340 3,200 2.2 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <5.0 <8.0 C 0.8 10.61 0.00 -8.71 -- 12/02/03 2.2 4.3 4.7 13 320 0.79 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <5.0 - 0.0 9.85 0.00 -7.95 03/03/04 56 140 59 360 2,500 -- 67 140 <0.50 <0.50 <0.50 <0.50 <0.50 - - - d 0.3 7.47 0.00 -5.57 06/09/04 85 200 63 370 3,500 - 110 130 <0.50 <0.50 <0.50 <0.50 <0.50 - -- 0.2 8.99 0.00 -7.09 09/16/04 32 60 12 68 670 - 61 65 <0.50 <0.50 <0.50 <0.50 <0.50 - -- - 1.8 10.52 0.00 -8.62 12/21/04 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 - 1.0 10.15 0.00 -8.25 01/28/05 1.0 1.2 <0.50 0.75 <50 - 4.2 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 - - - 0.7 8.83 0.00 -6.93 06/27/05 25 51 28 150 1,100 - 76 79 <0.50 <0.50 <0.50 <0.50 <0.50 - - - 1.5 8.29 0.00 -6.39 09/30/05 120 220 100 480 3,300 - 190 170 <0.50 <0.50 <0.50 <0.50 <0.50 - - - 2.5 8.89 0.00 -6.99 12/09/05 24 45 40 160 1,200 - 180 150 <0.50 <0.50 <0.50 <0.50 <0.50 - - 0.9 9.23 0.00 -7.33 03/03/06 12 19 34 150 1,100 - 250 230 <0.50 <0.50 <0.50 <0.50 <0.50 - - - 1.3 7.22 0.00 -5.32 06/23/06 40 62 43 190 1,300 - 270 230 <0.50 <0.50 <0.50 <0.50 <0.50 - - 2.4 8.29 0.00 -6.39 09/15/06 14 28 13 69 500 - 180 130 <0.50 <0.50 <0.50 <0.50 <0.50 - - - 0.3 9.67 0.00 -7.77 12/01/06 0.72 1.1 0.69 2.5 <50 - 91 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 - - - 4.0 9.81 0.00 -7.91 03/02/07 <0.50 <0.50 <0.50 <0.50 <50 - 1.6 9.5 <0.50 <0.50 <0.50 <0.50 <0.50 - - - g 3.9 8.39 0.00 -6.49 03/16/07 - - - - - - - - - - - - - - h - 8.29 0.00 -6.39 05/03/07 1.5 2.0 0.84 3.2 <50 - 4.6 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 - - - 1.7 8.56 0.00 -6.66 08/21/07 23 28 9.6 59 440 - 130 120 <0.50 <0.50 <0.50 <0.50 <0.50 - - - 1.6 10.50 0.00 -8.60 11/29/07 73 50 22 400 1,800 - 260 73 <0.50 <0.50 <0.50 - - - - - 0.2 10.05 0.00 -8.15 02/29/08 13 11 1.9 60 420 - 320 180 <0, <0.50 <0.50 _ _ _ _ _ 1.2 8.25 0.00 -6.35 05/30/08 13 11 7.6 34 360 - 290 230 <0.50 <0.50 <0.50 - - - - 0.8 9.36 0.00 -7.46 08/29/08 1.2 0.92 0.75 1.3 170 - 290 170 <0.50 <0.50 <0.50 - - - - d 0.4 11.01 0.00 -9.11 12/01/08 22 9.0 22 180 1,200 - 250 140 <0.50 <0.50 <0.50 - - - - - 0.2 10.53 0.00 -8.63 03/02/09 3.7 2.6 1.5 9.3 280 - 220 120 <0.50 <0.50 <0.50 - - - - - 0.3 8.13 0.00 -6.23 1.93 06/01/09 0.60 <0.50 <0.50 2.5 150 - 260 160 <0.50 <0.50 <0.50 - - - - - 1.8 9.54 0.00 -7.61 09/11/09 0.59 0.75 <0.50 1.8 88 - 170 50 <0.50 <0.50 <0.50 - - - - 1.1 11.20 0.00 -9.27 11/12/09 0.88 0.98 <0.50 3.7 110 - 150 63 <0.50 <0.50 <0.50 - - - - 1.4 10.00 0.00 -8.07 03/01/10 1.6 0.65 <0.50 2.0 74 - 110 120 <0.50 <0.50 <0.50 - - - - - 1.2 8.01 0.00 -6.08 06/09/10 0.85 <0.50 <0.50 3.8 <50 - 86 8.7 <0.50 <0.50 <0.50 - - - 0.7 8.88 0.00 -6.95 09/07/10 0.51 <0.50 <0.50 0.73 <50 - 22 <5.0 <0.50 <0.50 <0.50 - - - - 2.6 10.61 0.00 -8.68 12/13/10 <0.50 <0.50 <0.50 <0.50 <50 - 2.9 <5.0 <0.50 <0.50 <0.50 - - 3.91 9.45 0.00 -7.52 02/14/11 0.52 <0.50 <0.50 <0.50 <50 - 0.88 <5.0 <0.50 <0.50 <0.50 - - - 3.8 8.63 0.00 -6.70 05/09/11 <0.50 <0.50 <0.50 <0.50 <50 - <0.50 <5.0 <0.50 <0.50 <0.50 - - - 5.19 8.24 0.00 -6.31 08/15/11 <0.50 <0.50 <0.50 <0.50 <50 - 3.7 <5.0 <0.50 <0.50 <0.50 - - - - - 0.52 9.93 0.00 -8.00 1:\7-Eleven\7-11 Stores\141lMables\14117 Current Groundwater.xlsxHistoncal Water Page 10 of 11