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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 TPHg 8020 MtBE TBA DIPE EtBE TAME DCA EDB anol anol tone Notes Oxygen DTW SPT WTE To IL IL IL IL /L IL IL /L /L /L /L /L /L IL IL IL m /L feet feet feet MW-3 03/02/07 6.0 2.6 200 200 3,600 - <0.50 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 - - i 1.0 7.16 0.00 -6.08 (cont.) 03/16/07 - - - - - - - h 7.06 0.00 -5.98 05/03/07 6.6 2.8 220 200 3,700 - <0.50 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 - - - 0.7 7.05 0.00 -5.97 08/21/07 4.4 1.6 130 98 2,000 - <0.50 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 - - - 1.3 9.13 0.00 -8.05 11/29/07 4.2 0.99 110 73 1,700 - <0.50 <5.0 <0.50 <0.50 <0.50 - 0.4 8.85 0.00 -7.77 02/29/08 7.9 2.0 150 110 3,300 - 1.1 <5.0 <0.50 <0.50 <0.50 - - - - 1.5 6.96 0.00 -5.88 05/30/08 6.0 1.4 110 68 2,100 - 0.63 <5.0 <0.50 <0.50 <0.50 - - 1.1 8.00 0.00 -6.92 f 08/29/08 3.8 0.87 65 38 1,600 - 1.1 <5.0 <0.50 <0.50 <0.50 - - - - - 0.3 9.69 0.00 -8.61 C 12/01/08 4.8 0.96 83 41 1,900 - 2.1 <5.0 <0.50 <0.50 <0.50 - - 0.8 9.02 0.00 -7.94 03/02/09 7.5 1.2 160 96 2,700 - 1.4 <5.0 <0.50 <0.50 <0.50 - - - - 0.6 6.91 0.00 -5.83 0.75 06/01/09 7.7 1.6 160 91 3,100 - 1.8 <5.0 <0.50 <0.50 <0.50 - - - - 0.6 8.10 0.00 -7.35 09/11/09 3.1 0.59 18 9.5 1,800 - 1.8 <5.0 <0.50 <0.50 <0.50 - - - - - 0.8 9.93 0.00 -9.18 11/12/09 5.5 0.86 96 58 2,800 - 1.2 <5.0 <0.50 <0.50 <0.50 - - - 0.6 8.80 0.00 -8.05 03/01/10 2.8 <0.50 85 46 1,700 - 0.81 <5.0 <0.50 <0.50 <0.50 - - - - - 3.9 6.52 0.00 -5.77 06/09/10 2.2 <0.50 64 36 1,500 - 0.59 <5.0 <0.50 <0.50 <0.50 - - 1.0 7.60 0.00 -6.85 09/07/10 1.7 <0.50 45 18 1,000 - <0.50 <5.0 <0.50 <0.50 <0.50 - - - - 1.4 9.34 0.00 -8.59 12/13/10 <0.50 <0.50 1.7 1.0 450 - <0.50 <5.0 <0.50 <0.50 <0.50 - - - - - 0.89 8.22 0.00 -7.47 02/14/11 0.80 <0.50 28 10 720 - <0.50 <5.0 <0.50 <0.50 <0.50 - - - - 0.8 7.33 0.00 -6.58 05/09/11 1.0 <0.50 34 16 1,100 - <0.50 <5.0 <0.50 <0.50 <0.50 - - - 0.36 6.84 0.00 -6.09 08/15/11 0.94 <0.50 30 9.9 870 - <0.50 <5.0 <0.50 <0.50 <0.50 - - - - - 0.43 8.72 0.00 -7.97 MW-4 0.92 08/28/99 340 <10 750 150 4,200 - 510 <400 <100 <100 <100 - - - - 0.7 9.20 0.00 -8.28 11/24/99 485 13.4 553 169 6,740 1,240 969 <100 <25 <25 <25 - - - - - 1.3 9.95 0.00 -9.03 02/02/00 446 <3 1,150 664 2,150 1,220 1,490 <100 <25 <25 <25 - - - - - 1.3 9.96 0.00 -9.04 05/16/00 190 <12 250 130 9,600 - 1,700 <1,200 <50 <50 <50 - - 0.4 7.17 0.00 -6.25 08/08/00 980 <25 380 550 7,400 - 1,200 <1,200 <50 <50 <50 - - - - 0.3 8.55 0.00 -7.63 11/15/00 200 <10 400 300 4,700 - 1,100 650 <25 <25 <25 - - - 0.5 8.72 0.00 -7.80 02/07/01 200 <25 580 440 7,900 - 810 <620 <25 <25 <25 - - - a 0.8 7.67 0.00 -6.75 r 05/23/01 89 <5 340 260 3,500 - 810 <620 <25 <25 <25 - - - 1.0 7.60 0.00 -6.68 09/25/01 650 <10 190 140 4,500 - 1,300 <500 <120 <120 <120 - - - 0.6 9.72 0.00 -8.80 11/05/01 92 3.3 220 120 3,600 - 1,100 230 <50 <50 <50 <50 <50 - 0.8 9.49 0.00 -8.57 01/08/02 141 22 439 336 4,000 - 1,890 1,010 <5 <5 <5 - - - - 0.7 6.45 0.00 -5.53 04/12/02 170 9.9 330 220 4,400 870 910 1,800 <12 <12 <12 _ _ _ _ _ 0.7 7.11 0.00 -6.19 07/09/02 1,600 20 160 110 6,900 900 1,300 1,900 <25 <25 <25 - - 0.8 7.47 0.00 -6.55 10/16/02 12 5.5 25 7.3 770 180 210 1,300 <5 <5 <5 _ _ _ _ 0.9 8.80 0.00 -7.88 03/17/03 37 2.7 73 57 2,300 - 200 1,300 <0.50 <0.50 <0.50 - - - - 1.4 7.75 0.00 -6.83 05/29/03 56 6.0 170 120 4,100 - 170 1,800 <0.50 <0.50 <0.50 - - - - b 0.2 8.11 0.00 -7.19 0.88 09/18/03 16 0.76 31 11 1,400 - 96 780 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <5.0 <8.0 C 1.1 9.30 0.00 -8.42 12/02/03 1 8.4 1 <0.50 1 8.8 1 3.4 1 1,300 1 70 1 730 1<0.50 1<0.50 1<0.50 <0.50 1<0.50 1 <50 1 <5.0 0.1 1 8.71 0.00 1 -7.83 I:\7-Eleven\7-11 Storesk14117\Tables\14117 Current Groundwater.xlsxHistorical Water Page 5 of 11