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Table 4 Historical Groundwater Monitoring and Analytical Data 7-Eleven Store#14117 2725 Country Club Boulevard Stockton,California Well ID/ Ethyl- Tota! MtBE 1,2- Meth- Eth- Ace- Dissolved Elevation Date Benzene Toluene Benzene Xylenes TPHg 8020 MtBETBA DIPE EtBE TAME DCA EDB anol anol tone Notes Oxygen DTW SPT WTE TOC /L /L L /L /L 1L /L /L /L /L /L /L /L IL m L feet feet feet MW-2 0.68 08/28/99 4.5 <1 93 1.2 360 -- 800 1<2,500 <50 <50 <50 - - - 0.4 8.95 0.00 -8.27 11/24/99 2.25 0.42 33.9 <0.6 665 1,990 2,370 <50 <50 <50 - - - 1.2 9.20 0.00 -8.52 02/02/00 3.71 0.31 <0.3 2.15 2,740 4,880 6,300 <25 <25 <25 1.3 8.96 0.00 -8.28 05/16/00 <5 <5 <5 <10 890 -- 3,000 <100 <100 <100 - - 0.6 6.85 0.00 -6.17 08/08/00 0.86 <0.5 <0.5 <1 380 - 2,000 <100 <100 <100 - - - - 0.4 8.26 0.00 -7.58 11/15/00 <250 <250 <250 <750 1,900 - 9,800 <12000 <500 <500 <500 - 0.4 8.43 0.00 -7.75 02/07/01 9.8 0.59 <0.5 1.8 3,900 - 11,000 <12,000 <500 <500 <500 - - - 0.7 7.30 0.00 -6.62 05/23/01 1.1 <0.5 9.6 <1 3,000 10,000 26,000 <250 <250 <250 0.8 7.25 0.00 -6.57 09/25/01 310 4.7 11 14 410 - 36,000 65,000 <1,000<1,000 <1,000 - - 0.6 9.48 0.00 -8.80 11/05/01 280 5.4 5.5 19 3,400 - 9,200 98,000 <5,000 <5,000 <5,000 <5,000<5,000 1.0 9.24 0.00 -8.56 01/08/02 36 <5 <5 <5 860 - 1,730 141,000 <5 <5 <5 - - - 1.0 6.15 0.00 -5.47 04/12/02 3 3.5 1.4 <0.5 350 270 260 67,000 <5 <5 <5 - - 1.0 6.82 0.00 -6.14 07/09/02 0.55 0.93 <0.5 <0.5 81 24 <200 47,000 <200 <200 <200 0.9 7.23 0.00 -6.55 10/16/02 <0.5 <0.5 <0.5 <0.5 <50 12 <12 11,000 <12 <12 <12 - 1.0 8.60 0.00 -7.92 03/17/03 3.7 <2.0 <2.0 <2.0 <200 -- 4.8 4,100 <2.0 <2.0 <2.0 - 1.6 7.35 0.00 -6.67 05/29/03 8.2 <2.5 <2.5 <2.5 <250 - 15 5,700 <2.5 <2.5 <2.5 - - - 0.8 7.54 0.00 -6.86 0.68 09/18/03 <1.0 <1.0 <1.0 <1.0 <100 - 12 1,900 <1.0 <1.0 <1.0 <1.0 <1.0 <100 <10 <10 1.1 9.01 0.00 -8.33 12/02/03 1.2 <0.50 <0.50 <0.50 170 - 8.2 1,400 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <5.0 - 0.1 8.32 0.00 -7.64 03/03/04 1.2 <0.50 <0.50 0.93 490 - 12 2,200 <0.50 <0.50 <0.50 <0.50 <0.50 -- -- d,a 0.2 5.99 0.00 -5.31 06/09/04 4.1 <0.50 <0.50 <0.50 110 6.5 550 <0.50 <0.50 <0.50 <0.50 <0.50 0.2 7.34 0.00 -6.66 09/16/04 <0.50 <0.50 <0.50 <0.50 94 - 5.6 520 <0.50 <0.50 <0.50 <0.50 <0.50 - 2.6 8.89 0.00 -8.21 12/21/04 180 0.90 2.3 1.9 980 39 1,400 <0.50 <0.50 <0.50 <0.50 <0.50 f 0.7 8.90 0.00 -8.22 01/28/05 760 2.9 15 5.7 3,200 - 150 1,700 <0.50 <0.50 <0.50 <0.50 <0.50 - 0.2 7.52 0.00 -6.84 06/27/05 <0.90 <0.90 <0.90 <0.90 220 - 10 1,900 <0.90 <0.90 <0.90 <0.90 <0.90 - - 0.3 6.66 0.00 -5.98 09/30/05 8.7 <0.50 <0.50 <0.50 130 - 6.8 480 <0.50 <0.50 <0.50 <0.50 <0.50 - 2.6 7.12 0.00 -6.44 12/09/05 2.0 4.6 1.0 6.4 180 7.3 230 <0.50 <0.50 <0.50 <0.50 <0.50 - - 0.4 7.68 0.00 -7.00 03/03/06 13 1.0 <0.50 0.57 400 26 920 <0.50 <0.50 <0.50 <0.50 <0.50 2.1 5.46 0.00 -4.78 06/23/06 <0.50 <0.50 <0.50 <0.50 52 - 5.1 32 <0.50 <0.50 <0.50 <0.50 <0.50 - - 1.8 6.76 0.00 -6.08 09/15/06 <0.50 <0.50 <0.50 <0.50 84 5.5 120 <0.50 <0.50 <0.50 <0.50 <0.50 - 0.3 8.15 0.00 -7.47 12/01/06 <0.50 <0.50 <0.50 <0.50 160 2.1 100 <0.50 <0.50 <0.50 <0.50 <0.50 - 2.0 8.49 0.00 -7.81 03/02/07 <0.50 <0.50 <0.50 <0.50 200 - 1.9 240 <0.50 <0.50 <0.50 <0.50 <0.50 - - i 1.2 7.02 0.00 -6.34 03/16/07 -- -- - -- _ h -- 7.10 0.00 -6.42 05/03/07 3.7 <0.50 <0.50 <0.50 120 - 4.4 130 <0.50 <0.50 <0.50 <0.50 <0.50 - 0.7 7.07 0.00 -6.39 08/21/07 <0.50 <0.50 <0.50 <0.50 140 4.5 200 <0.50 <0.50 <0.50 <0.50 <0.50 0.8 9.00 0.00 -8.32 11/29/07 <0.50 <0.50 <0.50 <0.50 130 - 3.0 120 <0.50 <0.50 <0.50 -- - - - 0.1 8.75 0.00 -8.07 02/29/08 7.5 1.8 0.59 1.4 630 4.9 430 <0.50 <0.50 <0.50 - e 1.3 6.90 0.00 -6.22 05/30/08 6.5 <0.50 <0.50 0.70 210 - 3.2 140 <0.50 <0.50 <0.50 - - - - 0.4 7.94 0.00 -7.26 08/29/08 <0.50 1 <0.50 1 <0.50 1 <0.50 1 240 4.3 1 320 <0.50 <0.50 <0.50 - - - g 0.3 9.60 0.00 -8.92 V:\1857\active\7-Eleven\active\185750063_711_14117\05 report_deliv\tables\14117 Current Groundwater.xlsxHistodcal Water Page 3 of 12