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Table 2 Groundwater Analytical Results-Oxygenate Compounds Former Tosca(Unocal)Service Station 46981 4707 Pacific Avenue Stockton, California WELL IDS DATE METHANOL ETH4NOL T13A MTBE glt'Ic. FITRE TAME 1,2-1)CA EDB (PPM) (ppb) (Ppb) {Ppb) (PA (pp b) (PPb) (ppb) (ppb) VW-4 12/08/97 WELL CONNECTED TO VES -- -- -- -- -- -- - 03/05/98 - <500 <100 39 <2 0 <2 0 <2 0 - - 05/27/98 -- <1,250 <250 <5 0 <5 0 <5 0 <5 0 - - 07/21/98 -- <500 170 <2 0 <2 0 <2 0 <2 0 -- - 10/14/98 __ <16,500 <3,300 <66 <66 <66 <66 - - 01125-26199 -- <500 610 15 <2 0 <2 0 <2 0 -- 04119/-20!99 - <2,500 <500 15 <10 <10 <10 - - 07/15-16199 -_ -- 440 19 <10 <10 <10 -- -- 10125-26199 - -- 260 27 <2 0 <2 0 <2 0 -- -- I 01/27-28/00 -- -- 170 51 <2 0 <2 0 <2 0 -- 06/26-27/00 -- -- 1,080 1,110 <20 0 <20 0 <20 0 -- -- 09/22-23100 <1 00 <500 <50 160 <2 0 <2 0 <2 0 <2 0 <2 0 12126-27100 -- <5 000 <500 172 <100 <10 0 <100 -- -- 03107-08/01 - <2,000 227 321 <4 00 <4 00 <4 00 <4 00 696 i 06126-27101 -- <17,000 <1,700 330 <33 <33 <33 <33 <33 f 09112-13101 - <5,000 <500 310 <10 <10 <10 <10 <10 � 12112-13101 -- <1,000 <40 270 <20 <20 <20 <20 <20 03120-21102 -- <500 <100 36 <2 D <2 0 <2 0 <2 0 <2 0 06/06-07/02 <500 <100 40 <2 0 <2 0 <2 0 <2 0 <2 0 09/30/02 DRY -- -- -- -- -" -- -- -- 12130-31102 DRY -- -- -- -- -- -- -- -- VW-7 08/21/99 -- <2,500 <500 510 <10 <10 <10 -- -- 10125-26199 -- -- <100 47 <2 0 <2 0 <2 0 <2 0 <2 0 01127-28100 - - <100 75 <2 0 <2 0 <2 0 <2 0 2 3 06126-27100 -- -- <2,000 41 <40 0 <40 0 <40 0 <40 0 <40 0 09122-23100 <1 00 <500 <50 35 <2 0 <2 0 <2 0 <2 0 <2 0 i 12126-27100 -- <50,000 <5,000 <100 <100 <100 <100 <100 <100 03107-08/01 - <20,000 <2,000 <40 0 <40 0 <40 0 <40 0 <40 0 <40 0 06126-27101 - <25,000 <2,500 <50 <50 <50 <50 <50 X50 09112-13!01 - <25,000 <2,500 <50 <50 <50 <50 <50 <50 12112-13101 -- <17,000 <670 <33 <33 <33 <33 <33 <33 6981 XIS0138 A,031/02