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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 GeoEnvironmental Inc Client Project ID Flame Min[Mart Sampled 07-21-03 <br />' of Northern California Reference Number 5916 Received 07-23-03 <br /> 837 Shaw Road Sample Description Soil 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 5916-6S 7S, 8S,9S Reported 07-30-03 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GC/MS <br /> ANALYTE REPORTING SAMPLE; ID SAMPLE ID SAMPLE ID SAMPLE ID <br />' LIMIT MW 6-35 MW 6-45 MW 6-55 MW 7-50 <br /> m /K (m /K (m /K ) (m /K (mg/Kg) <br /> FUEL OXYGENATES <br />' Methyl tert-Butyl Ether(MTBE) 0 010 NO ND NO 28 <br /> Di-isopropyl Ether (DIPS) 0 010 NO NO NO ND <br />' Ethyl tert-Butyl Ether (ETRE) 0 010 NO NO NO NO <br /> tert-Amyl Methyl Ether(TAME) 0 010 ND NO NO 011 <br />'. tert-Butanol(TBA) 0 800 NO NO NO 29 <br />' Report Limit Multiplication Factor 1 1 1 1 <br /> I <br /> I <br /> Surrogate Recoveries <br /> 1 2-Dichloroethane-d4 106% 833% 761% 729% <br /> Toluene-d8 997% 758% 684% 651% <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 /> Img/Kg = milligrams per kilogram or parts per million(ppm) <br /> ANALYST APPROVED BY <br /> Clan J Cone ` Jam Phillips <br /> L oratory Director <br />