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Table 3 Groundwater Analytical Data-Oxygenate Compounds Chevron Service Station#9-4275 2905 Benjamin Holt Drive Stockton,California 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-4 11/25/97 ND ND ND 54 ND ND ND -- 03/26/98 <1,000 <4200 <830 1,100 <17 <17 <17 -- 06/24/98 -- <16 600 <3,330 4,600 <67 <67 <67 -- 03/02/01 (S) <500 <50 96 <20 <20 <2 0 <2 0 <20 03/02/01 (K) <50 18 90 <0 50 <0 50 <050 <0 50 <0 50 05/10/01 -- 64 180 <0 50 12 <0 50 <0 50 -- 08/21/01 99 110 <0 50 085 <0 50 <0 50 <050 12/05/01 - <5 0 14 <0 5 <0 5 <0 5 <05 <0 5 3/11102 - <5 52 <0 5 <0 5 <05 <0 5 <0 5 617102 <5 11 <0 5 <0 5 <0 5 <05 <0 5 9/24102 <100 4 <2 <2 <2 <2 <2 12/17/02 -- — <100 4 <2 <2 <2 <2 <2 MW-5 11/25/97 ND ND ND ND ND ND ND 03/26/98 <1,000 <500 <100 <2 0 <20 <20 <20 -- - 06/24/98 -- <1,660 <333 110 <67 <6 7 <67 -- -- 03/02101 (S) - <500 <50 75 <2 0 <2 0 <20 <20 <20 03/02/01 (K) 86 <50 61 <0 50 <0 50 <0 50 <050 <0 50 05/10/01 -- <50 078 <0 50 <050 <0 50 <0 50 08/21/01 - <50 <050 <050 <0 50 <0 50 <050 <0 50 08/21/01 <0 5 <0 5 <05 <0 5 <0 5 <0 5 <0 5 12/05/01 <5 0 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 3/11/02 <5 06 <0 5 <0 5 <0 5 <0 5 <05 617102 - <5 <0 5 <05 <0 5 <05 <0 5 <0 5 9/24102 <100 <2 <2 <2 <2 <2 <2 12/17/02 — -- <100 <2 <2 <2 <2 <2 <2 MW-6 11/25/97 ND ND ND 38 ND ND ND -- -- 03/26/98 <1,000 <5,000 <1,000 <20 <20 <20 <20 06/24/98 -- <1,660 <333 <6 7 <67 <6 7 <67 -- -- 03/02/01 (S) <500 <50 <20 <2 0 <20 <2 0 <20 <2 0 03/02/01 (K) 86 <50 059 <0 50 <0 50 <050 <0 50 <050 05/10/01 -- <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 08/21/01 <5 0 13 <0 50 <0,50 <0 50 080 <050 12105/01 <50 2 <0 5 <0 5 <05 <0 5 <0 5 3111102 <5 5 <0 5 <0 5 <0 5 2 <0 5 617102 <5 3 <0 5 <0 5 <0 5 2 <05 9124102 <100 <2 <2 <2 <2 <2 <2 12!17102 — <100 <2 <2 <2 <2 <2 <2 j Chevronl942751QMR194275 NF 2