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TABLE 1 GROUNDWATER EXTRACTION SYSTEM 40 ANALY71CAL DATA Former Chevron Service Station 9-5775 301 West Kettleman Lane Lodi, California Sample Sample I TPHg Benzene Toluene Ethyl- Total MtBE TBA DIPE ELBE TAME Ethanol Methanol EDB 1,2 -DCA Date Location benzene Xylenes W ( ( ( ) 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 <60 <0 5 <0 5 06/11/02 EFFL <50 <0 5 060 <0 5 <0 5 <0 5 <5 0 <0 5 <05 <05 <5 0 <50 <0 5 <0 5 06/18/02 EFFL <50 <0 5 <0 50 <0 5 <0 5 <05 <5 0 <0 5 <0 5 <0 5 <5 0 <50 <0 5 <05 06/25/02 EFFL <50 <05 <0 50 <0 5 <0 5 <05 <5 0 <05 <0 5 <0 5 <5 0 <50 <0 5 <0 5 07/02/02 EFFL <100 <20 <2 0 <2 0 <2 0 <2 0 <10 <2 0 <2 0 <2 0 <50 <100 <2 0 <2 0 07/1W2 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 07/30/02 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 01/07/03 EFFL <100 <2 <2 <2 <2 <2 <10 <2 <2 <2 <100 <400 <2 <2 01/21/03 EFFL <100 <2 <2 <2 <2 <2 <10 <2 <2 <2 <100 <400 <2 <2 Discharge Limitation I ND <5 0' 1 <5 0' <5 0' <5 0' ND ND ND ND 1 ND ---- i --- ---- ---- EXPLAMATIONS. ANALYTICAL LABORATORIES TPHIWI Petroleum Hydrocarbons as Gasoline DIPE = Di -isopropyl ether Sequoia Analytical (FLAP #1271, #1624 and #12360) 1,2=1,2-0tchioroathane ELBE = Ethyl tertiary butyl ether Kdf Analytical ( ELAP #2236) MIBF= Methyl tertiary butyl ether TAME = Tertiary amyl methyl ether Lancaster Laboratories (ELAP # 2116) TBA z 11043utypalcohol NA = Not analyzed for this constituent EDB a Ethylene dibromide ND = Not Detected or below method detection limits NOTES• ' Sum of benzene toluene ehtylbenzene and xylenes not to exceed 0 005 mg/L (5 ppb) Sample collected after approximately 1 400 gallons of tap water was pumped through system during cleaning procedures Sample included 2 butananne 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 (<5 0) Split sample collected for Qualatative analysis (Kdf Analytical) Split sample collected for Qualatative analysis (Lancaster Laboratories) BTEX constituents analyzed by EPA 50218 • GWE-Monthly As Page 12 of 12