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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 ETRE 1,2-DCA EDB j ID DATE (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) I MW-7 11/25/97 ND ND ND ND ND ND ND 03/26/98 <1,000 <500 <100 21 <2 0 <20 <20 06/24/98 -- <500 <100 44 <2 0 <20 <20 -- -- 03/02/01 (S) <500 <50 <2 0 <20 <20 <2 0 <20 <2 0 03/02/01 (K) - 13 <50 063 <0 50 <0 50 <0 50 <0 50 <0 50 05/10/01 -- <50 72 <0 50 <0 50 <0 50 <0 50 -- 08/21/01 -- - <50 72 <0 50 <0 50 <0 50 <0 50 - 12/05/01 - - <5 0 <0 5 <05 <0 5 <0 5 <0 5 <0 5 03/11/02 - - <5 <0 5 <05 <0 5 <0 5 <0 5 <0 5 06/07/02 - <5 <0 5 <0 5 <0 5 <0 5 <0 5 <05 09/24/02 <100 <2 <2 <2 <2 <2 <2 12/17/02 - - <100 <2 <2 <2 <2 <2 <2 MW-8 11/25/97 ND ND ND 19 ND ND ND -- -- 03/26/98 <1,000 <500 <100 <2 0 <20 <2 0 <2 0 06/24/98 -- <500 <100 <20 <20 <20 <2 0 -- - 03/02/01 (S) <500 <50 <2 0 <20 <20 <2 0 <20 <2 0 03/02/01 (K) 23 <50 096 <0 50 <0 50 <0 50 <0 50 <050 05/10/01 -- <50 <0 50 <0 50 <0 50 <0 50 <0 50 - 08/21/01 -- <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12/05/01 -- -- <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 3/11102 - - <5 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 617/02 - <5 05 <0 5 <0 5 <0 5 <0 5 <0 5 9124/02 -- <100 <2 <2 <2 <2 <2 <2 12/17/02 - - <100 <2 <2 <2 <2 <2 <2 MW-9 11/25/97 ND ND ND 2,100 ND ND ND - -- 03/26/98 <1 000 <2 000 <400 540 <80 22 <80 06/24/98 -- <2,780 <556 480 <11 <11 20 -- -- 03/02/01 (S) <500 <50 52 <20 <2 0 <2 0 <2 0 <20 03/02/01 (K) 19 <50 45 <0 50 098 <0 50 <0 50 <0 50 05/10/01 -- <50 36 <0 50 <0 50 <0 50 <0 50 - 08121/01 - <50 50 <0 50 22 <0 50 072 <0 50 12/05/01 <50 71 <0 5 30 <0 5 20 <0 5 03/11/02 - <5 46 <0 5 06 <05 2 <0 5 06/07/02 <5 75 <0 5 05 <0 5 08 <0 5 09/24/02 <100 280 <2 4 <2 <2 <2 12/17/02 -- - <100 200 <2 <2 <2 <2 <2 ChevronT42751QMR19-4275 NF 3