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Table 3 Groundwater Analytical Data-Oxygenate Compounds Chevron Service Station#9-4275 2905 Benjamin Holt Dnve Stockton,California i WELL SAMPLE METHANOL ETHANOL TBA MTBE DIPE TAME ETBE 1,2-DCA EDB ID DATE (ppb) (ppb) (ppb) (ppb) (ppb) (Ppb) (ppb) (Ppb) (ppb) MW-1 11/25/97 ND ND ND 50 ND ND ND 03/26/98 <1,000 <500 <100 120 <20 <2 0 <2 0 06/24/98 <3,120 <625 25 <12 <12 <12 -- -- 03/02/01 (S) -- <2,500 <250 1,300 <10 <10 <10 <10 <10 03/02/01 (K) 83 <20 970 <2 0 <20 <20 <2 0 <2 0 05/10/01 -- <25 2100 <25 17 <2 5 <2 5 -- 08/21/01 110 1700 <25 13 <2 5 <25 <2 5 12/05/01 <50 120 <0 5 20 <0 5 <0 5 <0 5 03/11/02 - <5 2,200 <0 5 21 <0 5 <0 5 <0 5 06/07/02 34 1700 <1 15 <1 <1 <1 09/24/02 <100 2 500 <2 31 <2 <2 <2 12/17/02 - <100 3,300 <2 34 <2 <2 <2 MW-2 11/25/97 ND ND ND 21 ND ND ND -- -- 03/26/98 <1,000 <5,000 <1 000 35 <20 <20 <20 06/24/98 -- <1450 <290 54 <58 <5 8 <5 8 -- -- 03/02/01 (S) <500 <50 410 <2 0 60 <2 0 <2 0 <2 0 03/02/01 (K) <10 16 380 <0 50 50 <0 50 <0 50 <0 50 05/10/01 - 12 210 <0 50 28 <0 50 <0 50 08/21/01 -- -- <50 16 <0 50 <0 50 <0 50 <050 <0 50 12/05/01 <5 0 40 <50 <50 <50 <50 <50 3111102 <5 240 <05 4 <05 <0 5 <0 5 6,r7102 <5 130 <05 2 <0 5 05 <05 9124102 <100 7 <2 <2 <2 <2 <2 12!17102 -- -- <100 11 <2 <2 <2 <2 <2 MW-3 11/25/97 ND ND ND 28 ND ND ND - -- 03/26/98 <1,000 <500 <100 90 <2 0 69 <2 0 -- 06/24198 <1,470 <294 41 <59 <5 9 <59 - 03/02/01 (S) -- <1,000 <100 430 <4 0 10 <4 0 <4 0 <40 03/02/01 (K) - 33 15 400 <1 0 89 <1 0 <1 0 <1 0 05/10/01 -- <50 220 <0 50 41 <0 50 <0 50 - 08/21/01 _ 72 15 <0 50 <0 50 <0 50 <0 50 <0 50 12/05/01 <5 0 27 <05 <0 5 <0 5 <05 <0 5 3/11102 <5 1,800 <0 5 22 <0 5 <0 5 <05 617102 <10 1,200 <1 14 <1 <1 <1 9124/02 <100 450 <2 3 <2 <2 <2 12/17/02 - - <100 430 <2 3 <2 <2 <2 I Chevron1942751QMR19-4275 NF