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TABLE 2 GROUNDWATER ANALYTICAL RESULTS FOR OXYGENATES AND ADDITIONAL COMPOUNDS ARCO Service Station No 5469 130 South Wilson Way, Stockton,California USEPA USEPA Method 8260 Method 8015 M Well TBA MTBE DIPE ETBE TAME 1,2-DCA EDB Ethanol Methanol Number Date MW-5 06/21/00 259 8,370 <2 <2 746 <2 <2 <3,000 <1 09/08/00 357 10,300 <2 <2 104 <2 <2 <3,000 117 12/11/00 245 12,100 [2] <2 <2 131 <2 <2 <3,000 <1 03/22/01 <200 15,600 [3] <2 [4] <2 [4] <2 [4] <2 [41 <2 [4] NA NA 05/24/01 <1000[4] 14,400 <10[4] <10[41 <10[4] <10[4] <10[4] NA NA 09/14/01 <2,000 16,000 <20 <20 <20 <20 <20 NA NA 12/14/01 <50 12,000 <5 0 <5 0 14 <5 0 <5 0 NA NA 02/21/02 <1,000[3] 13,000 <100[3] <100[3] <100[3] <100[31 <100[3] NA NA 04/23/02 <5,000[3] 7,600[3] <500[3] <500[3] <500[3] <500[31 <500[3] NA NA 09/19/02 <500 4,600 <50 <50 <50 <50 <50 <5,000 NA 12/11/02 <1,000 3,800 <25 <25 <25 <25 <25 NA NA 01/I4/03 <2,000 1,500 <50 <50 <50 NA NA NA NA 02/12/03 <20 54 <0 50 <0 50 <0 50 NA NA <40 NA 02/26/03 <20[5] 14[5] <0 50 <0 50 <0 50 <0 50 <0 50 <40 NA 05/19/03 <2,000 A 2,300 A <100 A <100 A <100 A <50 A <50 A <10,000 A NA 09/09/03 <1,000[61 1 1,100 A <50[6] J <50[6] J <50[6] J <25[6] J <25[6] J <5,000 A NA 12/10/03 <20 A 1,200[7] J <1 0 A <1 0 A <1 0 A <0 50 A <0 50 A <100 A NA 03/04/04 <20 A 1,200 A <1 0 A <1 0 A 11 A <0 50 A <0 50 A <100 A NA 06/08/04 <500 A 490 A <25 A <25 A <25 A <12 A <12 A <2,500 A NA 09/14/04 <200 A 360[16] J <5 0 A <5 0 A <5 0 A <5 0 A <5 0 A <1,000[17] J NA 12/09/04 <200 A 310 A <10 A <10 A <10 A <5 0 A <5 0 A <1000 A NA 5TlpA TLlS Arco_5469_Quarterly^Data 5ofII