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I <br />' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone (209)384-2930 <br />' Certificate No 2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmental Inc Client Protect ID Top Filling Station Sampled 06-04-03 <br />' of Northern California Reference Number 5793 Received 05-10-03 <br /> 837 Shaw Road Sample Description Water Extracted 06-13-03 <br /> Stockton CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 06-13-03 <br /> Attn Tim Cuellar Lab Numbers 5793-16W Reported 06-18-03 <br /> GASOLINE ADDITIVES AND SOLVENTS BY EPA METHOD 8250 GC/MS <br /> ANALYTE REPORTING SAMPLE ID <br /> LIMIT VW-3A <br />' 060403 <br /> (pg/Lu IL <br /> FUEL OXYGENATES <br /> IMethyl tert-Butyl Ether(MTBE) 050 2200 <br /> Di-isopropyl Ether (DIPEr) 050 NO <br /> IEthyl tert-Butyl Ether (ETRE) 050 NO <br /> I <br /> tert-Amyl Methyl Ether(TAME) 050 NO <br />'. tert-Butanol(TBA) 20 NO <br /> I VOLATILE HALOCARBONS <br /> 1 2-Dichloroethane (1,2-DCA) 050 NO <br /> IEthylene Dibromide (EDB) 050 NO <br /> Report Limit Multiplication Factor 100" <br /> Report limit raised due to matnx interference <br /> Surrogate Recoveries <br />' 1 2-Dichloroethane-d4 907% <br /> Toluene-d8 922% <br /> Instrument ID HP 5972 MS <br /> I Analytes reported as NO were not detected or below the Practical Quantitation Limit <br /> Practical Quantitation Limit=Reporting Limit x Report Limit Multiplication Factor <br /> (fig/L) = micrograms per liter or part er billion(ppb) <br /> (:]. ANALYST APPROVED BY <br /> Clan J Cone me Phillips <br /> Laboratory Director <br />