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TABLE 2 GROUNDWATER ANALYTICAL RESULTS FOR OXYGENATES AND ADDITIONAL COMPOUNDS(U S EPA METHOD 8260) Former ARCO Service Station No 2168 441 Charter Way Stockton,California Well Sample TBA MTBE D1PE ETRE TAME 1,2-DCA Number Date gg/L gg/L 991L µg/L µg/L µg/L MW-1 11/17/97 NA NA NA NA NA NA 5/22/98 <10,000 <100 <100 <100 <100 NA 8/12/98 <200 <2 <2 <2 <2 NA 11/9/98 <200 242 6 1 <2 <2 NA 2/17/99 <200 238 686 <2 <2 NA 5/25/99 <200 308 54 <2 <2 NA 8118/99 <200 116 686 <2 <2 NA 12/17/99 <200 344 4 <2 <2 NA 2/22100 <200 193 428 <2 <2 NA 6/22/00 <200 132 426 <2 <2 NA 8/30/00 <200 228 616 <2 <2 <2 11/21/00 <200 128 344 <2 <2 <2 2/15/01 <200 226 357 <2 <2 <2 5/17/01 <1000 243 <10 <30 <10 <10 8/16/01 <10,000[2] <100[2] <100[2] <100[2] <10012] <100[2] 12/6/01 <500[2] <50[2] <50[2] <50[2] <50[2] <50[2] 2/14/02 <5 0 29 29 <0 50 <0 50 053 MW-1B 8/30/00 <200 <2 <2 <2 <2 <2 11/21/00 <200 <2 <2 <2 <2 <2 2/15/01 <200 <2 <2 <2 <2 <2 5/17/01 <200 <2 <2 <2 <2 <2 8/16/01 <200 <2 <2 <2 <2 <2 12/6/01 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 2/14/02 <5 0 <0 50 <0 50 <0 50 <0 50 055 MW-1C 8130/00 <200 <2 <2 <2 <2 408 11/21/00 <200 <2 <2 <2 <2 292 2/15/01 <200 <2 <2 <2 <2 3 23 5/17/01 <200 <2 <2 <2 <2 250 8/16/01 <200 <2 <2 <2 <2 <2 12/6/01 <5 0 <0 50 <0 50 <0 50 <0 50 1 8 2/14/02 <5 0 <0 50 <0 50 <0 50 <0 50 14 MW-2 11/17/97 NA NA NA NA NA NA 5/21/98 <10,000 <100 <100 <100 <100 NA 8/12/98 <200 <2 <2 <2 <2 NA 11/9/98 <200 <2 <2 <2 <2 NA 2/17/99 <200 <2 <2 <2 <2 NA 5/25/99 <200 <2 <2 <2 <2 NA 8/18/99 <200 <2 <2 <2 <2 NA 12/17/99 <200 <2 <2 <2 <2 NA 2/22/00 <200 <2 <2 <2 <2 NA 6122/00 <200 <2 <2 <2 <2 NA 8/30/00 <200 <2 <2 <2 <2 322 11/21/00 <200 <2 <2 <2 <2 <2 2/15/01 <200 <2 <2 <2 <2 <2 5/17/01 <200 <2 <2 <2 <2 <2 8116/01 <200 <2 <2 <2 <2 <2 12/6/01 <50[2] <5 0[2] <5 0[2] <5 0[2] <5 0[2] <5 0[2] 2/14/02 44 <0 50 <0 50 <0 50 <0 50 059 Arro_2168_Quanerly_Data xis I of 4 Delta