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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 Project ID Rainwater Car Wash Sampled 11-11-02 <br /> ' of Northern California Reference Number 5220 Received 11-12-02 <br /> 837 Shaw Road Sample Description Water Extracted 11-15-02 <br /> Stockton,CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 11-15-02 <br /> Attn Tim Cuellar Lab Numbers 5220-16W, 17W, 18W, 19W,20W Reported 11-26-02 <br /> ' GASOLINE ADDITIVES BY EPA METHOD 8260 GUMS <br /> ANALYTE REPORTING SAMPLE 1D SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> ' LIMIT MW 10C MW 10D MW 10E MW 10F MW 13A <br /> 111102 111102 111102 111102 111102 <br /> - (UUIL) (ugtL) (ugIL) (iglu (u41L) (uBIL) <br /> FUEL OXYGENATE5 <br /> ' Methyl tert-Butyl Ether(MTBE) 050 NO NO NO NO 11 <br /> ' Di-isopropyl Ether (DIPS) 050 NO NO NO NO NO <br /> Ethyl tert-Butyl Ether (ETBE) 050 NO NO NO NO NO <br /> tert-Amyl Methyl Ether(TAME) 050 NO NO ND NO NO <br /> tert-Butanol(TBA) 20 NO NO NO NO NO <br /> ' VQLAILE HALOCARBONS <br /> 1 2-Dichloroethane (1,2-DCA) 050 089 NO NO ND NO <br /> ' Ethylene Dibromide (EDB) 050 NO NO NO ND ND <br /> ' Report Limit Multiplication Factor 1 1 1 1 1 <br /> Surrogate Recoveries <br /> 12-Dichloroethane-d4 709% 672% 627% 101% 681% <br /> ' Toluene-d8 998% 984% 996% 973% 990% <br /> instrument ID HP 5972 MS <br /> Analytes reported as NO were not detected or below the Practical Quantitation Limit <br /> ' Practical Quantitation Limit=Reporting Limit x Report Limit Multiplication Factor <br /> (pgIL)= micrograms per liter or parts per billion(ppb) <br /> 0' ANALYST t APPROVED BY <br /> Clan J one Ja hr!lrps <br /> I boratory Director <br />