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i <br /> Ile 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 Project ID Top Filling Station Sampled 06-04-03 <br /> of Northern California Reference Number 5793 Received 06-10-03 <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 5793-1W, 2W, 3W,4W, 5W Reported 06-18-03 <br /> I <br /> GASOLINE ADDITIVES AND SOLVENTS BY EPA METHOD 8260 GCIMS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW 1 MW 2 MW 3 MW 4 MW 5 <br /> 060403 060403 060403 060403 060403 <br /> - (NgIL) (uglL) T (ug/L) L9«,7_......_ (uglL) (uglL) <br /> FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 NO 1 7 190 ND 47 <br /> Di-isopropyl Ether (DIPE) 050 NO NO ND ND ND <br /> Ethyl tert-Butyl Ether (ETRE) 050 NO NO NO ND NO <br /> • tert-Amyl Methyl Ether(TAME) 050 ND NO ND NO NO <br /> tert-Butanol(TBA) 20 ND ND ND NO NO <br /> VOLATILE HALOCAR13ONS <br /> 1,2-Dichloroethane (1 2-DCA) 050 ND 056 NO ND ND <br />` Ethylene Dibromide (EDB) 0 50 ND ND ND ND ND <br /> Report Limit Multiplication Factor 1 1 50* 1 1 <br /> report limit raised due to matnx interference <br /> I Surrogate Recoveries <br /> I 1,2-Dichloroethane-d4 933% 870% _ 868% 976% 812% <br /> Toluene-d8 944% 110% 107% 108% 108% <br /> Instrument ID HP 5972 MS <br /> Analytes reported as ND were not detected or below the Practical Quantitation Limit <br /> Practical Quantitation Limit= Reporting Limit x Report Limit Multiplication Factor <br /> (NgIL)= micrograms per liter or parts per billion(ppb) <br /> ANALYST A A AO[ ALJ APPROVED BY <br /> Clan J Cone Ja Phillips <br /> oratory Director <br /> l <br />