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Sample Date TABLE 7TPH]gBenzene Vg/ GROUNDWATER EXTRACTION SYSTEM ' ANALYTICAL DATA Former Chevron Service Station 119-5775 i 301 West Kettleman Lane TSA 1 Lodi, California . TAME 1 Sample Date Sample Location 7TPH]gBenzene Vg/ l Toluene Ethyl- benzene 1 Total Xylenes I MtBE 1 TSA 1 D1PE l ELBE TAME 1 Ethanol 1 MethanolEDB l 1,2 -DCA V 06/06/01 Effluent <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 <0.50 <0.50 06/13/01 Effluent <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 <0.50 <0.50 06120!01 Effluent <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 <0.50 <0.50 06/27101 Effluent <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 <0.50 <0.50 07105!01 Effluent <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 <0.50 <0.50 07/11101 Effluent <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 <0-50 <0.50 07118101 Effluent <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0S0 <0.50 <0.50 <5.0 <50 <0,50 <0.50 07/25/01 Effluent <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 11 <50 <0.50 <0.50 08!02101 Effluent <50 <0.54 <0.50 <4.50 <0.50 <0.50 c 5.4 <0.50 <0.50 <0.50 <5.0 <50 <0.50 <0.50 08!08101 Effluent <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 <0.50 <0.50 08/15/01 Effluent <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 <0.50 <0.50 08/21/01 Effluent <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 <0.50 <0.50 08/29/01 Effluent <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 <0.50 <0.50 09/05/01 Effluent <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 <0.50 <0.50 09/12/01 Effluent <50 <0.50 <0.50 <.50 0 <4.50 <0.50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 <0.50 <0.50 09/19/01 Effluent <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 <0.50 <0.50 09/26/01 Effluent <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 <0.50 <0.50 Discharge Limitation ND <5.0' <5.W 1 <5.0, <5.01 ND ND ND ND I ND EXPLANATIONS: ANALYT1CAl. LABORATORIES TPHg - Total Petroleum Hydrocarbons as Gasoline D[PE - Di -isopropyl ether Sequoia Analytical (ELAP 9127), #1624 and 412360) 1,2 -DCA m 1.2-Dichloroethaue ELBE = Ethyl tertiary butyl ether KiffAnalytical ( ELAP #2236) MteE- Methyl tertiary butyl ether TAME = Tertiary amyl methyl ether TBA - ten -Butyl -alcohol NA = Not analysed for this constituent B - Ethylene dibromide ND - Not Detected OF below method detection limits ES - sum of benzene. toluene, ehtylbenzene and xylenes not to exceed 0.005 mg1L (5 ppb). Sample collected after approximately 1.400 gallons of tap water was pumped through system during cleaning procedures. r Sample included 2-butanaone and tetrzhydrofuran which were quantified as TPHg. a Sample collected after aperoximately 1,500 gallons of tap water were pumped through system during cleaning procedures. Tetrahydrofuran reported as ND (<5.0). 077.43452.5701GWEdw Page 8 of 8