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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 Nomellmi Sampled 07-19-04 <br />' of Northern California Reference Number 7172 Received 07-20-04 <br /> 837 Shaw Road Sample Description Water Extracted 07-23-04 <br /> Stockton CA 95215 Sample PreplAnalySiS Method EPA 5030/8260 Analyzed 07-23-04 <br /> Attn Tim Cuellar Lab Numbers 7172-1W,2W 3W,4W 5W Reported 08-02-04 <br />' GASOLINE ADDITIVES BY EPA METHOD 8260 GUMS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br />' LIMIT MW 1 MW 2 MW 3 MW 4 MW 5 <br /> 071904 071904 071904 071904 071904 <br /> IL IL IL IL It IL <br />' FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 200 190 20 45 21 <br />' Di-isopropyl Ether (DIPE) 050 ND ND 72 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 ND <br /> tent-Butanol(TBA) 20 ND ND ND 73 ND <br /> VOLATILEHALOCARBONS <br /> 1 2 Drchloroethane (1 2-DCA) 050 ND ND ND 1 6 ND <br />' Ethylene Dibromide (EDB) 050 ND ND ND ND ND <br />' Report Limit Multiplication Factor 10* 50* 10* 1 1 <br /> I `Report limit raised due to matrix interference <br /> Surrogate Recoveries <br /> 1 2-Dichloroethane-d4 974% 113% 106% 131% 101% <br /> Toluene-d8 964% 103% 995% 892% 883% <br /> Instrument ID HP 5972 MS <br /> Analytes reported as ND were not detected or below the Practical Quantitation Limit <br /> Practical Quantitation Limit W Reporting Limit x Report Limit Multiplication Factor <br /> . (pg/L)= micrograms per liter o per billion(ppb) <br /> 0 ANALYST APPROVED BY <br /> Clan J Cone Jam C l/lips <br /> IL oratory Director <br />