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TIE y Taw... 2 � Historical Groundwater Monitoring and Analytical Data 7-Eleven Store#20632 4627 Da Vinci Drive Stockton,CA Well IDI Ethyl= MtBE...... Dissolved Elevation Date Benzene: Toluene Benzene Xylene TPHg 8020 MtBE TBA DIP.E EtBE TAME'. Notes Oxygen DTW SPT' WfE TOC (Ng/L) (Ng]L) (PglL) (P4tL} i1�91L1. (NgIL) .. (Ng]L) is (NgfL) (Ng/L) (1�9/L) (NgIL) (mg/L} (feet). .(feet) (feet) MW-3 2.82 10/17/97 2.6 1.5 38 110 620 <5.0 -- -- -- -- -- -- 8.29 0.00 -5.47 03/22/98 ND 4 15 31 120 -- ND ND ND ND ND 0.2 6.55 0.00 -3.73 06/15/98 <0.3 1.1 5.3 18 <1 -- <10 <100 <5 <5 <5 1.0 6.72 0.00 -3.90 08/25/98 0.648 <0.3 9.36 <0.6 <50 -- <5 <50 <5 <5 <5 -- 7.56 0.00 -4.74 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 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 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 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 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 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 05/16/00 <5 49 640 2,000 9,500 -- <1 <50 <2 <2 <2 0.6 6.60 0.00 -3.78 08/08/00 <2.5 <2.5 340 110 4,100 -- <1 <50 <2 <2 <2 0.6 7.60 0.00 -4.78 11/15/00 6.6 <5 500 270 3,300 -- <10 <500 <20 <20 <20 0.4 7.00 0.00 -4.18 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 05/23/01 <1 1.7 140 120 -- -- <1 <25 <2 <2 <2 b 0.7 7.19 0.00 -4.37 08/21/01 12 23 260 340 4,300 -- <10 <500 <20 <20 <20 c 0.9 7.83 0.00 -5.01 11/05/01 17 15 220 260 3,300 -- <5 <20 <5 <5 <5 0.7 7.65 0.00 -4.83 01/09/02 <5 <5 199 282 1,570 -- <10 <20 <5 <5 <5 0.7 5.32 0.00 -2.50 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 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 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 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 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 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 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 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 04/27/04 <0.50 0.67 84 71 3,400 -- 3.6 <5.0 <0.50 <0.50 <0.50 1.0 7.31 0.00 -4.49 07/08/04 <0.50 <0.50 29 12 2,200 -- 2.4 <5.0 <0.50 <0.50 <0.50 0.5 7.59 0.00 -4.77 10/08/04 <0.50 <0.50 18 6.3 1,500 -- 2.7 <5.0 <0.50 <0.50 <0.50 d 0.2 7.75 0.00 -4.93 02/18/05 <0.50 0.61 63 96 2,300 -- 1.3 <5.0 <0.50 <0.50 <0.50 0.3 5.94 0.00 -3.12 06/08/05 <0.50 <0.50 0.94 <0.50 380 <0.50 <5.0 <0.50 <0.50 <0.50 0.1 7.22 0.00 -4.40 1:17-Elevenl7-11 Stores1206321Tables120632 Current Groundwater.AsHistorical Water Page 4 of 8