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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 IDI Ethyl- MtBE Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg 8020 MtBE TBA DIPE EtBE TAME Notes Oxygen DTW SPT WTE <br /> TOC (pg/L) (pg/L) I (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (mg/L) (feet) (feet) (feet) <br /> Groundwater Grab Samples <br /> GP-1 02/21/97 390 700 370 2,100 16,000 16,000 -- -- -- -- <br /> GP-5 02/21/97 110 12 39 310 2,800 1,800 -- -- -- -- -- -- -- -- -- <br /> GP-7 02/21/97 34 6.5 26 110 440 5.8 -- -- -- -- <br /> GP-8 02/21/97 <0.50 <0.50 <0.50 0.94 830 1,600 870 -- -- -- -- -- -- -- -- <br /> GP-9 02/21/97 <0.50 <0.50 <0.50 1.1 <50 <5.0 -- -- -- -- <br /> GP-10 02/21/97 <0.50 <0.50 <0.50 <0.50 <50 <5.0 -- -- -- -- -- -- -- -- -- <br /> Monitoring Well Samples <br /> MW-1 <br /> 1.73 10/17/97 6.5 <0.5 <0.5 1.3 51 16 13 -- -- - -- -- 7.13 0.00 -5.40 <br /> 03/22/98 ND ND ND 0.78 ND -- 47 ND ND ND ND 0.4 5.35 0.00 -3.62 <br /> 06/15/98 <0.3 <0.3 <0.5 <0.6 <100 -- <10 <100 <5 <5 <5 1.8 5.55 0.00 -3.82 <br /> 08/25/98 <0.3 <0.3 <0.5 <0.6 <50 -- <5 <50 <5 <5 <5 -- 6.29 0.00 -4.56 <br /> 12/29/98 <0.3 <0.3 <0.3 <0.6 <50 -- <5 <20 <5 <5 <5 0.4 6.60 0.00 -4.87 <br /> 02/17/99 <0.5 <0.5 <0.5 <0.5 <50 5.2 8.6 <2 <5 <5 <5 0.5 4.90 0.00 -3.17 <br /> 05/21/99 <0.3 <0.3 <0.3 <0.6 <50 -- <5 <20 <5 <5 <5 1.0 6.05 0.00 -4.32 <br /> 08/28/99 <0.3 <0.3 <0.3 <0.6 <50 5.81 5.54 <20 <5 <5 <5 0.9 6.80 0.00 -5.07 <br /> 11/24/99 0.91 3.78 2.41 5.88 259 <5 <5 <20 <5 <5 <5 1.0 6.60 0.00 -4.87 <br /> 02/02/00 <0.3 <0.3 <0.3 <0.6 <50 <5 21.1 <20 <5 <5 <5 1.0 5.49 0.00 -3.76 <br /> 05/16/00 <0.5 <0.5 <0.5 <1 <100 -- 16 <50 <2 <2 <2 0.7 5.49 0.00 -3.76 <br /> 08/08/00 0.5 <0.5 <0.5 <1 <100 -- 12 <50 <2 <2 <2 0.4 6.47 0.00 -4.74 <br /> 11/15/00 0.81 <0.5 <0.5 <1.5 <100 -- 7.6 <50 <2 <2 <2 0.5 5.85 0.00 -4.12 <br /> 02/07/01 <0.5 5.9 0.79 1.6 <100 -- 2.9 <50 <2 <2 <2 a 0.4 5.73 0.00 -4.00 <br /> 05/23/01 1.4 0.55 <0.5 <1 <100 -- 2.5 <50 <2 <2 <2 0.7 5.82 0.00 -4.09 <br /> 08/21/01 <0.5 <0.5 1 1.5 <100 -- 2.1 <50 <2 <2 <2 0.9 6.71 0.00 -4.98 <br /> 11/05/01 <0.5 <0.5 1.0 1.5 120 -- <5 <20 <5 <5 <5 0.9 6.52 0.00 -4.79 <br /> 01/09/02 <5 <5 <5 <5 <50 -- 180 77 <5 <5 <5 0.8 4.13 0.00 -2.40 <br /> 04/10/02 <0.5 0.73 <0.5 <0.5 <50 <5 1.9 <5 <0.5 <0.5 <0.5 0.8 6.02 0.00 -4.29 <br /> 07/10/02 <0.5 0.7 <0.5 <0.5 <50 <5 3.9 <5 <0.5 <0.5 <0.5 1.0 6.50 0.00 -4.77 <br /> 10/16/02 <0.5 <0.5 <0.5 <0.5 <50 7.5 9.1 <5 <0.5 <0.5 <0.5 1.0 6.73 0.00 -5.00 <br /> 03/26/03 <0.50 0.81 <0.50 0.53 <50 -- 3.0 <5.0 <0.50 <0.50 <0.50 0.8 5.84 0.00 -4.11 <br /> 05/20/03 <0.50 <0.50 <0.50 <0.50 <50 -- 1.5 <5.0 <0.50 <0.50 <0.50 0.5 6.03 0.00 -4.30 <br /> 08/01/03 <0.50 <0.50 <0.50 <0.50 <50 -- 1.4 <5.0 <0.50 <0.50 <0.50 0.1 6.65 0.00 -4.92 <br /> 10/23/03 <0.50 <0.50 <0.50 <0.50 <50 -- 1.6 <5.0 <0.50 <0.50 <0.50 1.4 6.03 0.00 -4.30 <br /> 01/12/04 <0.50 <0.50 <0.50 <0.50 <50 -- 6.5 49 <0.50 <0.50 <0.50 0.2 4.92 0.00 -3.19 <br /> I:\7-Eleven\7-11 Stores\20632\Tables\20632 04-1Q.AsHistorical Water Pagel of 6 <br />