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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 5220-1 W. 2W,3W,4W 5W Reported 11-26-02 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GC/MS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> ' LIMIT MW 13F MW 7A MW 7B MW 7C MW 7D <br /> 111102 111102 111102 111102 111102 <br /> — – - (pg1L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) <br /> ' FUEL OXYGENATES <br /> Methyl Cert-Butyl Ether(MTBE) 050 ND 9100 88 30 15 <br /> Di-rsopropyi Ether (DIPE) 050 ND NO ND ND NO <br /> Ethyl tert-Butyl Ether (ETRE) 050 ND ND ND ND NO <br /> '. tert-Amyl Methyl Ether(TAME) 050 NO 78 NO 072 NO <br /> tert-Butenol(TBA) 20 NO ND ND ND NO <br /> ' VOLATILE HALOCARBONS <br /> 1 2-Dlchloroethane (1,2-DCA) 050 NO ND 37 20 20 <br /> ' Ethylene Dibromide (EDB) 050 ND NO NO NO ND <br /> ' Report Limit Multiplication Factor 1 20` 1 1 1 <br /> Report Limit Multiplication Factor for MTBE 200 <br /> "Report limit raised due to matrix interference <br /> tSurrogate Recoveries <br /> 1,2-Dichloroethane-d4 938% 102% 873% 907% 849% <br /> ' Toluene-d8 985% 991% 98 1% 103% 106% <br /> Instrument ID HP 5972 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 /> 0 <br /> ' ANALYST Clan J APPROVER BY <br />� one Ja a Phillips <br /> horatory Director <br />