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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 GeoEnvrronmental 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 Prep/Analysis Method EPA 5030/8260 Analyzed 08-18-02 <br /> Attn Tim Cuellar Lab Numbers 4974-11W Reported 08-28-02 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GCIMS <br />' ANALYTE REPORTING SAMPLE ID <br /> LIMIT MW 10B <br />' 08-14-02 <br /> IL u /L <br /> FUEL OXYGENATES <br />' Methyl tert-Butyl Ether(MTBE) 050 62 <br /> D,-isopropyl Ether (DIPE) 050 ND <br />' Ethyl tert-Butyl Ether (ELBE) 050 ND <br /> tert-Amyl Methyl Ether(TAME) 050 ND <br />' tert-Butanol(TBA) 20 ND <br />' YQLATILE HALOCARBONS <br /> 1,2-Dichloroethane (1,2-DCA) 050 069 <br />' Ethylene ā¯‘ibromide (EDB) 050 ND <br /> Report Limit Multiplication Factor 1 <br /> Surrogate Recoveries <br /> 1 2-Dichloroethane-d4 906% <br /> Toluene-d8 965% <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 /> (pg/L)= micrograms per liter or parts per billion (ppb) <br /> IANALYST APPROVED BY <br /> Clan J Cone J e C Phillips <br /> Iaboratory Director <br />