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T f 2 Historical Groundwater M .ging and Analytical Data 7-Eleven Store#20632 4627 Da Vinci Drive Stockton,CA Dissolve Well IDI Ethyl- MtBE d Elevation Date Benzene Toluene_ Benzene Xylene TPiig 8020 MtBE TBA DIPE EtBE TAME-` Notes Oxygen DTW SPTI-,':WTE TOC :aP9tL1 (4�9�L) (40 (PLYLI (Pg1L1 (pWL) (jigfL? (1�9tL? (pg/L) (Pg/L1 (Vg1L}' (mglL} (feet) `(feet)`(feet) MW-2 01/12/04 <1.5 <1.5 <1.5 <1.5 <200 -- 680 15,000 <1.5 <1.5 <1.5 0.2 6.22 0.00 -3.40 {cont} 04/27/04 <5.0 <5.0 <5.0 <5.0 <500 -- 750 7,300 <5.0 <5.0 <5.0 0.6 7.37 0.00 -4.55 07/08/04 <0.50 <0.50 <0.50 <0.50 <50 -- 950 2,700 <0.50 <0.50 0.91 0.7 7.69 0.00 -4.87 10/08/04 <1.0 <1.0 <1.0 <1.0 <100 -- 490 100 <1.0 <1.0 <1.0 0.2 7.82 0.00 -5.00 02/18/05 <0.90 <0.90 <0.90 <0.90 <90 - 680 <5.0 <0.90 <0.90 <0.90 0.3 5.97 0.00 -3.15 06/08/05 <1.5 <1.5 <1.5 <1.5 <150 -- 620 <7.0 <1.5 <1.5 <1.5 0.1 7.29 0.00 -4.47 09/01/05 <0.50 0.79 <0.50 0.80 <50 -- 260 <5.0 <0.50 <0.50 <0.50 2.8 7.85 0.00 -5.03 10/25/05 <0.50 <0.50 <0.50 <0.50 <50 -- 350 <5.0 <0.50 <0.50 <0.50 3.1 7.99 0.00 -5.17 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 02107/01 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 <1.7 1 5.4 1 140 1 170 1 2,700 1 28 1 37 1 <10 I <1 <1 <1 0.9 7.85 0.00 -5.03 1:17-Elevenl7-11 Stores1206321Tables120632 Current Groundwater.AsHistorical Water Page 4 of 10