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Table 1 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#20632 <br /> 4627 Da Vinci Drive <br /> Stockton,CA <br /> Well ID/ Ethyl- MtBE IDissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg 8020 MtBE TBA DIPE EtBE TAME Notes Oxygen IDTW SPT WTE <br /> TOC (Pg/L) (Ng/L) (Pg/L) (Pg/L) (Ng/L) (Pg/L) (N9/L) (Ng/L) (Ng/L} I(Pg/L) (Ng/L) (mg/L) (feet) (feet) (feet) <br /> MW-3 <br /> 2.82 10/17/97 2.6 1.5 38 110 620 <5.0 -- -- -- -- -- -- 8.29 0.00 -5.47 <br /> 03/22/98 ND 4 15 31 120 -- ND ND ND ND ND 0.2 6.55 0.00 -3.73 <br /> 06/15/98 <0.3 1.1 5.3 18 <1 -- <10 <100 <5 <5 <5 1.0 6.72 0.00 -3.90 <br /> 08/25/98 0.648 <0.3 9.36 <0.6 <50 -- <5 <50 <5 <5 <5 -- 7.56 0.00 -4.74 <br /> 12/29/98 <0.3 1.54 2.39 8.6 <50 -- <5 <20 <5 <5 <5 0.4 7.65 0.00 -4.83 t <br /> 02/17/99 <0.5 <0.5 2.7 <0.5 <50 <5 <5 <20 <5 <5 <5 0.7 6.04 0.00 -3.22 <br /> 05/21/99 <0.3 1.08 3.41 10.5 <50 -- <5 <20 <5 <5 <5 0.9 7.30 0.00 -4.48 <br /> 08/28/99 <0.3 <0.3 <0.3 <0.6 50 -- <5 <20 <5 <5 <5 0.9 7.95 0.00 -5.13 <br /> 11/24/99 <0.3 <0.3 <0.3 <0.6 95 89.6 <5 <20 <5 <5 <5 1.3 7.70 0.00 -4.88 <br /> 02/02/00 <0.3 <0.3 <0.3 <0.6 <50 <5 6.49 <20 <5 <5 <5 1.2 6.56 0.00 -3.74 <br /> 05/16/00 <5 49 640 2,000 9,500 -- <1 <50 <2 <2 <2 0.6 6.60 0.00 -3.78 <br /> 08/08/00 <2.5 <2.5 340 110 4,100 -- <1 <50 <2 <2 <2 0.6 7.60 0.00 -4.78 <br /> 11/15/00 6.6 <5 500 270 3,300 -- <10 <500 <20 <20 <20 0.4 7.00 0.00 -4.18 <br /> 02/07/01 9.8 <2.5 160 75 1,700 -- <1.0 <50 <2 <2 <2 a 0.7 6.87 0.00 -4.05 <br /> 05/23/01 <1 1.7 140 120 -- -- <1 <25 <2 <2 <2 b 0.7 7.19 0.00 -4.37 <br /> 08/21/01 12 23 260 340 4,300 -- <10 <500 <20 <20 <20 c 0.9 7.83 0.00 -5.01 <br /> 11/05/01 17 15 220 260 3,300 -- <5 <20 <5 <5 <5 0.7 7.65 0.00 -4.83 <br /> 01/09/02 <5 <5 199 282 1,570 -- <10 <20 <5 <5 <5 0.7 5.32 0.00 -2.50 <br /> 04/10/02 <5 14 180 110 3,800 <50 6 <5 <0.5 <0.5 <0.5 0.9 7.20 0.00 -4.38 <br /> 07/10/02 0.84 11 180 200 3,300 <10 7.8 <5 <0.5 <0.5 <0.5 0.9 7.60 0.00 -4.78 <br /> 10/16/02 <1.7 5.4 140 170 2,700 28 37 <10 <1 <1 <1 0.9 7.85 0.00 -5.03 <br /> 03/26/03 <0.50 <0.50 28 6.2 1,300 -- 11 <5.0 <0.50 <0.50 <0.50 0.7 7.08 0.00 -4.26 <br /> 05/20/03 <0.50 <0.50 12 7.3 520 -- 4.6 <5.0 <0.50 <0.50 <0.50 d 0.4 7.29 0.00 -4.47 <br /> 08/01/03 <0.50 <0.50 24 13 750 -- 8.2 <5.0 <0.50 <0.50 <0.50 0.1 7.84 0.00 -5.02 <br /> 10/23/03 <0.50 1.2 370 240 6,000 -- 9.1 <5.0 <0.50 <0.50 <0.50 1.3 7.14 0.00 -4.32 <br /> 01/12/04 <1.0 1.2 210 160 4,100 -- 13 <10 <1.0 <1.0 <1.0 0.7 6.17 0.00 -3.35 <br /> I:\7-Eleven\7-11 Stores\20632\Tables\20632 04-1Q.AsHistorical Water Page 3 of 6 <br />