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TABLE 2 ' ADDITIONAL GROUNDWATER DATA THRIFTY OIL STATION#172,STOCKTON,CA OXYGENATES ALCOHOLS Di isopropyl Ether Ethyl-Tert Butyl Ether Tert-Amyl Methyl Ether Tert-Butyl Alcohol Ethyl Alcohol Methyl Alcohol DATE (RIPE) (ETRE) (TAME) (TBA) (Ethanal) (Methanol) SAMPLED 4-41.1 (u&1L) (n91L) (uF/Q (mg1L) 02/05/04 <0 29 <0 17 <0 28 <10 <20 <20 05/05/04 <0 29 <0 17 <0 28 <10 <20 <20 08/11/04 <0 29 <0 l7 <0 28 <10 <20 <20 1 11/10!04 <0 29 <0 17 <0 28 <10 <20 <20 02/22/05 <0 29 <0 17 <0 28 <10 <20 <20 ' MONITORING WELL#wW--n 08/19/97 <20 <20 <20 <500 <0 5 <10 11/26/97 <20 <20 <20 <500 <0 5 <2 02/18/98 <20 <20 <20 1 100 <0 5 13 ' 05/27/98 <20 <20 <20 510 <0 5 <2 08/26198 <20 <20 <20 970 <0 5 15 11/24/98 <20 <20 2 300 2 700 <0 5 <2 1 02/18199 <20 <20 <20 3 000 <0 5 <2 05/20/99 <20 <20 <20 920 <0 5 <2 08/18/99 40 <20 <20 980 <0 5 5 8 11/10/99 <20 <20 <20 2 100 <0 5 79 1 02123/00 <25 45 <25 <2 500 <2 5 <125 05110/00 <0 5 <0 5 <0 5 <50 <0 05 <0 25 08/18/00 <2 <2 <2 <50 <50 <50 11/09/00 - - 02/15101 <0 5 <0 7 <0 5 33 <20 <20 05117/01 - - - - 05/24/01 <0 5 <0 7 <0 5 8181 X20 <20 08/16/01 <25 <35 <25 <500 <20 <20 11/08/01 <5 0 <7 0 <5 0 1 210 <20 <20 02/21/02 <50 <70 <50 <1000 <20 <20 05122/02 <125 <175 <125 <2 500 <20 <20 08114/02 <20 <12 <16 <1 000 <20 <20 1 11/20/02 <0 2 <0 12 <0 16 <10 <20 X20 02112/03 <0 29 <0 17 <0 28 <10 <20 <20 05121/03 <14 5 <8 5 <14 365 I <20 <20 08/20/03 <14 5 <8 5 13 100 13 400 <20 <20 1 11/26/03 <2 9 <1 7 <2 8 <100 <20 <20 02/05104 <29 <17 <28 <1 000 <20 <20 05/05/04 <14 5 <8 5 323 5 250 <20 <20 08/11/04 <29 <17 <28 <1000 <20 QO 1 09/30/04 <29 <17 <28 <1 000 <20 <20 11110/04 <72 5 <42 5 <70 <2 500 <20 <20 02122/05 <7 25 <4 25 71 450 <20 <20 NOTE DIPS ETBE TAME TBA Ethanol Methanol analyzed by EPA Methods 9260 8260B Beginning 8!18100 Ethanol and Methanol analyzed by D285 GC FID 1 1 772TAB2 OXY Page 5 of 5 3/m2005