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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95309 Phone (209)384-2930 <br /> Certificate#2079 Fax (209)384-9507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Pacific Car Wash Sampled 8-17-00 <br /> of Northern California Reference Number 3167 Received 8-18-00 <br /> 4005 North Wilson Way Sample Description Water Extracted 8-23-00 <br /> Stockton,CA 95205 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 8-23-00 <br /> Attn Tim Cuellar Lab Numbers 3167-11W Reported 8-30-00 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GCIMS <br /> ANALYTE REPORTING SAMPLE ID <br /> LIMIT MW-1013 <br /> I 08-17-00 <br /> (uall-) ( /L) <br /> FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 ND <br /> Di-isopropyi Ether (DIPS) 050 ND <br /> Ethyl tert-Butyl Ether (ETRE) 050 ND <br /> tert-Amyl Methyl Ether(TAME) 050 ND <br /> tert-Butanol(TBA) 50 ND <br /> Report Limit Multiplication Factor 1 <br /> f <br /> I <br /> Surrogate Recoveries <br /> 1,2-Dichloroethane-d4 962% <br /> Instrument ID HP 5972MS <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 /> (pg/L)= micrograms per liter or parts per billion (ppb) <br /> ANALYST APPROVED BY f <br /> Clan J Cone � ---- <br /> J es C Phillips <br /> aboratory Director <br />