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i <br /> I CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209)384-1507 <br /> Advanced GeoE nviron mental Inc Client Protect ID Top Filling Station Sampled 07-23-03 <br /> of Northern California Reference Number 5924 Received 07-25-03 <br /> 837 Shaw Road Sample Description Sod Extracted 07-25-03 <br /> Stockton, CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 07-26-03 <br /> Attn Tim Cuellar Lab Numbers 5924-6S,73 Reported 08-18-03 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GC1MS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID <br /> LIMIT MVV 8-40 MW 8-55 <br /> (mg/Kg) rn !K m !K <br /> FUEL OXYGENATES <br />' Methyl tert-Butyl Ether(MTBE) 0 010 ND ND <br /> Di-isopropyl Ether (DIPS) 0 010 ND ND <br />' Ethyl tert-Butyl Ether (ETBE) 0 010 ND ND <br /> tert-Amyl Methyi Ether(TAME) 0 010 ND ND <br />' tert-Butanol(TBA) 0 800 ND ND <br /> VOLATILE HALOCARSONS <br />' 1 2-Dichloroethane (1,2-DCA) 0 010 ND ND <br /> Ethylene Dibromide (EDB) 0 010 ND ND <br /> 1 <br /> Report Limit Multiplication Factor 1 1 <br /> 1 <br /> 1 <br />' Surrogate Recoveries <br /> 1 2-Dichloroethane-d4 751% 836% <br /> Toluene-d8 789% 820% <br />' Instrument ID HP 5972 MS <br /> Analytes reported as ND were not detected or below the Practical Quantitation Limit <br /> Practical Quantitation Limit=Rep Limit x Report Limit Multiplication Factor <br /> mg/Kg = milligrams per ktlogr, or p rts er million(ppm) <br /> ANALYSTAA—Z APPROVED BY (:71, <br />' Clan J Cone J a 6-Phillips <br /> eaboratory Director <br />