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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 Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg 8020 MtBE TBA DIPE EtBE TAME Notes Oxygen DTW SPTWTE <br /> TOC (Pg/L)__ _ (Ng/L) (t�gfL) (Pg'L) (Pg/L) (NgfL) (Pg/L) (Ng/L) (pgIL) (Ng/L) (pg/L) (mg/L) (feet)- (feet) (feet) <br /> MW-4 <br /> 2.58 10/17/97 610 760 320 2,800 20,000 18,000 23,000 -- -- -- -- -- 8.04 0.00 -5.46 <br /> 03/22/98 81 5.6 32 27 2,600 -- 26,000 ND ND ND ND 0.3 6.27 0.00 -3.69 <br /> 06/15/98 700 20 170 73 22,000 -- 17,000 <5,000 <250 <250 <250 2.1 6.47 0.00 -3.89 <br /> 08/14/98-Well Abandoned 0.00 2.58 <br /> MW-4R <br /> 04/10/02 330 31 120 480 3,700 4,200 5,900 230,000 <500 <500 <500 6.1 6.72 0.00 -- <br /> 2.37 07/10/02 340 28 210 490 4,500 3,300 5,700 370,000 <1,000 <1,000 <1,000 1.5 7.15 0.00 -4.78 <br /> 10/16/02 49 15 40 50 980 1,300 1,500 150,000 <1,000 <1,000 <1,000 1.4 7.30 0:00 -4.93 <br /> 03/26/03 <50 <50 <50 <200 <5,000 -- 2,500 170,000 <50 <50 <50 0.5 6.73 0.00 -4.36 <br /> 05/20/03 52 <10 28 47 1,400 -- 1,800 170,000 <10 <10 <10 0.7 6.82 0.00 -4.45 <br /> 08/01/03 <50 <50 <50 <50 <5,000 -- 1,300 75,000 <50 <50 <50 0.2 7.44 0.00 -5.07 <br /> 10/23/03 160 <20 110 83 2,100 -- 2,200 33,000 <20 <20 <20 1.5 6.76 0.00 -4.39 <br /> 01/12/04 310 30 290 300 4,500 -- 3,000 23,000 <10 <10 <10 0.3 5.65 0.00 -3.28 <br /> I:\7-Eleven\7-11 Stores\20632\Tables\20632 04-10.xlsHistorical Water Page 4 of 6 <br />