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1 <br />' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone (209)384-2930 <br />' Certificate#2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Sampled 03-19-04 <br />' of Northern California Reference Number 6789 Received 03-23-04 <br /> 837 Shaw Road Sample Description Water Extracted 04-02-04 <br /> Stockton CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 04-02-04 <br /> Attn Tim Cuellar Lab Numbers 6789-1W 2W, 3W,4W, 5W Reported 04-06-04 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GUMS <br />' ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW 8 MW 3 MW 1 MW 6 MW 12 <br />' 031904 031904 031904 031904 031904 <br /> ( /L) ( lL) IL) (pq/L) / /L) <br /> FUEL OXYGENATES <br />' Methyl tert-Butyl Ether(MTBE) 050 ND ND NO ND ND <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 NO <br /> tert-Butanol(TBA) 20 ND ND ND ND ND <br /> VOLATILE HALOCARBONS <br /> 1 2-Dichtoroethane (1,2-DCA) 050 ND 055 ND ND ND <br />' Ethylene Dibromide (EDB) 050 ND ND ND ND ND <br />' Report Limit Multiplication Factor 1 1 1 1 1 <br /> I <br /> Surrogate Recoveries <br /> 1 2-1lichloroethane-d4 101% 962% 927% 967% 949% <br /> Toluene-d8 895% 101% 929% 939% 899% <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 /> (pg/L)= micrograms per' <br /> liter or parts per billion(ppb) <br /> l , <br /> APPROVED BY APPROVED BY C[A <br /> Clan J Cone rnes rps <br /> Laboratory Man er Laboratory Director <br />