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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 Pacific Car Wash Sampled 11-25-02 <br /> of Northern California Reference Number 5269 Received 11-26-02 <br /> 837 Shaw Road Sample Description Water Extracted 12-02-02 <br /> Stockton CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 12-02-02 <br /> Attn Tim Cuellar Lab Numbers 5269-6W,7W, 8W, 9W, 10W Reported 12-06-02 <br /> f <br /> GASOLINE ADDITIVES 6Y EPA METHOD 8260 GC/MS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW 6 MW 7 MW 8 MW 9 MW 10A <br /> 112502 112502 112502 112502 112502 <br /> (ua/L) <br /> FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 1500 16 ND 41 470 <br /> Di-isopropyl Ether (DIPS) 050 ND ND ND ND ND <br /> Ethyl tert-Butyl Ether (ETBE) 050 ND ND ND ND ND <br /> tert-Amyl Methyl Ether(TAME) 050 ND ND ND ND ND <br /> tert-Butanol(TBA) 20 ND ND ND ND ND <br /> IVOLATILE HALOCARBONS <br /> 1,2-Dichloroethane (1,2-DCA) 050 ND ND ND ND ND <br /> IEthylene Dibromide (EDB) 050 ND ND ND ND ND <br /> I Report Limit Multiplication Factor 50* 1 1 5* 10* <br /> Report Limit Multiplication Factor for MTBE 20 <br /> *Report limit raised due to matrix interference <br /> surrogate Recoveries <br /> 1 2-Drchloroethane-d4 975% 938% 938% 190% 874% <br /> Toluene-d8 973% 103% 101% 896% 970% <br /> Instrument ID Varian Saturn 3 MS&HP 5972 MS <br /> Analytes reported as ND were not detected or below the Practical Quantitation Limit <br /> Practical Quantrtation Limit=Reporting Limit x Report Limit Multiplication Factor <br /> (pgIL) = micrograms er liter or parts ilhon(ppb) <br /> f, <br /> :7z- <br /> ANALYST r APPROVED BY , <br /> iii 1 <br /> Clan J Cone Jame Phillips <br /> L <br /> aO&atory Director <br /> E <br />