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TABLE 1 GROUNDWATER EXTRACTION SYSTEM ANALYTICAL DATA Former Chevron Service Station 9-5775 301 West Kettleman Lane Lodi, California Sample Sample TPHg Benzene Toluene Ethyl- Total MtBE TBA DIPE ELBE TAME Ethanol Methanol EDB 1,2 -DCA Date Location benzene Xylenes ( ( ( ( ) ( ) ( ) ( L) ( ) ( ) ( ) ( ) ( () 06/04/02 EFFL. <50 <0 5 <0 5 <0 5 <0 5 <0 5 <5 0 <0 5 <0 5 <0 5 <5 0 <50 <0 5 <0 5 06/11/02 EFFL <50 <0 5 060 <0 5 <0 5 <0 5 <5 0 <0 5 <0 5 <0 5 <5 0 <50 <0 5 <0 5 06/18/02 EFFL <50 <0 5 <0 50 <0 5 <0 5 <0 5 <5 0 <0 5 <0 5 <0 5 <5 0 <50 <05 <0 5 06/25/02 EFFL <50 <0 5 <0 50 <0 5 <0 5 <0 5 <50 <0 5 <0 5 <0 5 <5 0 <50 <0 5 <0 5 07/02/02 EFFL <100 <2 0 <2 0 <2 0 <2 0 <2 0 <10 <2 0 <2 0 <2 0 <50 <100 <2 0 <2 0 07/16/02 EFFL <100 <2 0 <2 0 <2 0 <20 <2 0 <10 <2 0 <2 0 <2 0 <50 <100 <2 0 <2 0 07/30/02 EFFL <50 <2 <2 <2 <2 <2 <10 <2 <2 <2 <100 <400 <2 <2 8/13/027 EFFL <100 <0 50 1 1 <0 50 <1 5 <2 <10 <2 <2 <2 <100 <400 <2 <2 8/28/027 EFFL <100 <0 50 24 31 <1 5 <2 <10 <2 <2 <2 <100 <400 <2 <2 09/12/02 EFFL <50 <2 <2 <2 <2 <2 <10 <2 <2 <2 <100 <400 <2 <2 09/24/02 EFFL <50 <2 <2 <2 <2 <2 <10 <2 <2 <2 <100 <400 <2 <2 10/08/02 EFFL <100 <2 <2 <2 <2 <2 <10 <2 <2 <2 <100 <400 <2 <2 10/22/02 EFFL <100 <2 <2 <2 <2 <2 <10 <2 <2 <2 <100 <400 <2 <2 11/05/02 EFFL <50 <0 5 <0 5 <0 5 <0 5 <2 <10 <2 <2 <2 <100 <400 <2 <2 11/20/02 EFFL <50 <2 <2 <2 <2 <2 <10 <2 <2 <2 <100 <400 <2 <2 12/03/02 EFFL <100 <2 <2 <2 <2 <2 <10 <2 <2 <2 <100 <400 <2 <2 12/17/02 EFFL <50 <2 <2 <2 <2 <2 <10 <2 <2 <2 <100 <400 <2 <2 Dischar a Llmltatlon I ND 1 <5 0' <5 0' <5 0' <5 0' ND ND ND ND ND --- ---- -- ---- EXPLANATIONS ANALYTICAL LABORATORIES TPHg = Total Petroleum Hydrocarbons as Gasoline Di PE = Di-usopropyl ether Sequoia Analytical (ELAP #1271, #1624 and #12360) 1,2 A = 1,2-Dichlorcethane EtBE = Ethyl tertiary butyl ether Kiff Analytical (FLAP #2236) ethyl tertiary butyl ether TAME = Tertiary amyl methyl ether Lancaster Laboratories (FLAP # 2116) rt Butyl alcohol NA = Not analyzed for this constituent EDS = Ethylene dibromide ND = Not Detected or below method delec ion limits NOTES r Sum of benzene toluene ehtylbenzene and xylenes not to exceed 0 005 mg1L (5 ppb) Sample collected after approximalely 1 400 gallons of tap water was pumped through system during cleaning procedures ' Sample included 2-butanaone and tetrahydrofuran which were quantified as TPHg Sample collected after approximately 1 500 gallons of tap water were pumped through system during cleaning procedures Tetrahydrofuran reported as ND (<50) Split sample collected for Qualatatrve analysis (Kiff Analytical) Split sample collected for Qualatative analysis (Lancaster Laboratories) BTEX constituents analyzed by EPA 8021 B • GWE-Monthly Page 12 of 12