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eCD2 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 DIPE EtBE TAME Notes Oxygen DTW °SPT WTE TOC (pglL) (pglL) (pg1L) (pglL) - (pall-) (pg►L) (Ng/L) (pglL) (pglL) (pglL) (pglL) (mglL) (feet) (feet] (feet) MW-6 04/10/02 <0.5 <0.5 <0.5 <0.5 <50 <5 1.1 <5 <0.5 <0.5 <0.5 6.0 6.70 0.00 -- 2.38 07/10/02 <0.5 <0.5 <0.5 <0.5 <50 <5 1.3 <5 <0.5 <0.5 <0.5 1.4 7.12 0.00 -4.74 10/16/02 <0.5 <0.5 <0.5 <0.5 <50 <5 1.4 <5 <0.5 <0.5 <0.5 1.0 7.40 0.00 -5.02 03/26/03 <0.50 0.91 <0.50 0.84 <50 -- 2.3 <5.0 <0.50 <0.50 <0.50 1.3 6.56 0.00 -4.18 05/20/03 <0.50 <0.50 <0.50 <0.50 <50 -- 1.4 <5.0 <0.50 <0.50 <0.50 d 0.6 6.77 0.00 -4.39 08/01/03 <0.50 <0.50 <0.50 <0.50 <50 -- 1.1 <5.0 <0.50 <0.50 <0.50 0.2 7.41 0.00 -5.03 10/23/03 <0.50 <0.50 <0.50 <0.50 <50 -- 1.4 <5.0 <0.50 <0.50 <0.50 1.4 6.76 0.00 -4.38 01/12/04 <0.50 <0.50 <0.50 <0.50 <50 -- 33 66 <0.50 <0.50 <0.50 0.7 5.58 0.00 -3.20 04/27/04 <0.50 <0.50 <0.50 <0.50 <50 -- 2.3 <5.0 <0.50 <0.50 <0.50 1.1 6.76 0.00 -4.38 07/08/04 <0.50 <0.50 <0.50 <0.50 <50 -- 2.0 <5.0 <0.50 <0.50 <0.50 0.4 7.06 0.00 -4.68 10/08/04 <0.50 <0.50 <0.50 <0.50 <50 -- 1.5 <5.0 <0.50 <0.50 <0.50 d 0.2 7.22 0.00 -4.84 02/18/05 <0.50 <0.50 <0.50 <0.50 <50 -- 1.1 <5.0 <0.50 <0.50 <0.50 1.4 5.41 0.00 -3.03 06/08/05 <0.50 <0.50 <0.50 <0.50 <50 -- 0.94 <5.0 <0.50 <0.50 <0.50 0.2 7.68 0.00 -5.30 MW-7 04/10/02 <5 7.7 <5 5.2 <500 13,000 22,000 <5,000 <500 <500 <500 5.7 7.20 0.00 -- 2.73 07/10/02 <10 <10 <10 <10 <1,200 21,000 30,000 <10,000 <1,000 <1,000 <1,000 1.3 7.65 0.00 -4.92 10/16/02 <12 <12 <12 <12 <1,200 32,000 31,000 <5,000 <500 <500 <500 1.2 7.95 0.00 -5.22 03/26/03 <100 <100 <100 <100 <10,000 -- 56,000 28,000 <100 <100 <100 0.7 7.14 0.00 -4.41 05/20/03 <200 <200 <200 <200 <20,000 -- 54,000 44,000 <200 <200 <200 0.4 7.33 0.00 -4.60 08/01/03 <100 <100 <100 <100 <10,000 -- 47,000 38,000 <100 <100 <100 0.1 7.94 0.00 -5.21 10/23/03 <100 <100 <100 <100 <10,000 -- 44,000 55,000 <100 <100 <100 1.4 7.23 0.00 -4.50 01/12/04 <50 <50 <50 <50 <5,000 25,000 56,000 <50 <50 <50 0.3 6.13 0.00 -3.40 04/27/04 <50 <50 <50 <50 <5,000 -- 19,000 62,000 <50 <50 <50 1.1 7.31 0.00 -4.58 07/08/04 <0.50 <0.50 <0.50 <0.50 200 -- 17,000 55,000 <0.50 <0.50 19 0.9 7.61 0.00 -4.88 10/08/04 <25 <25 <25 <25 <2,500 -- 13,000 68,000 <25 <25 <25 0.4 7.74 0.00 -5.01 02/18/05 <25 <25 <25 <25 <2,500 -- 9,100 44,000 <25 <25 <25 0.3 5.87 0.00 -3.14 06/08/05 <7.0 <7.0 <7.0 7.0 <700 -- 3,800 7,500 <7.0 <7.0 <7.0 0.1 7.22 0.00 -4.49 IA7-Elevenl7-11 Stores1206321Tables120632 Current GroundwaterAsHistodral Water Page 7 of 8 i