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1 <br />' CASTLE ANALYTICAL LABORATORY <br /> Envrronmentai 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 08-14-02 <br />' of Northern California Reference Number 4974 Received 08-15-02 <br /> 837 Shaw Road Sample Description Water Extracted 08-18-02 <br /> Stockton, CA 95215 Sample PreplAnalysis Method EPA 5030/8260 Analyzed 08-18-02 <br /> Attn Tim Cuellar Lab Numbers 4974-6W,7W,8W,9W, 10W Reported 08-28-02 <br /> 1 e <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GCIMS <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 />' 08-14-02 08-14-02 08-14-02 08-14-02 08-14-02 <br /> ( /L u /L (u/L u /L) (u IL) (u /L <br /> FUEL OXYGENATES <br /> 1 Methyl tert-Butyl Ether(MTBE) 050 1800 93 ND 12 490 <br /> Di-isopropyl Ether (DIPS) 050 NO ND ND ND ND <br />' Ethyl tert-Butyl Ether (ETBE) 050 ND NO ND ND NO <br /> tert-Amyl Methyl Ether(TAME) 050 ND ND ND 069 24 <br />' tert-Butanol(TBA) 20 NO NO ND NO 62 <br />' VOLATILE HALOCARBONS <br /> 1,2-Dichloroethane (1,2-DCA) 050 ND ND ND 16 18 <br />' Ethylene Dibromide (EDB) 050 ND NO ND ND ND <br /> Report Limit Multiplication Factor 100` 5- 1 1 1 <br /> Report Limit Multiplication Factor for MTBE only 10 <br /> I <br /> ' <br /> Report limit raised due to matrix interference <br /> Surrogate Recoveries <br />' 1 2-Dichloroethane-d4 100% 776% 916% 918% 875% <br /> Toluene-d8 103% 934% 989% 109% 894% <br /> Instrument ID Varian Saturn 3 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 /> (pglL)= micrograms per liter or parts per billion(ppb) <br /> ANALYSTwe—tdceis APPROVED BY <br /> Clan J Cone Ja s illips <br /> boratory Director <br />