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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 Nomellrni 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 Prep/Analysis Method EPA 5030/8260 Analyzed 07-23-04 <br /> Attn Tim Cuellar Lab Numbers 7172-6W 7W, 8W Reported 08-02-04 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GUMS <br /> ANALYTE REPORTING SAMPLE 1D SAMPLE ID SAMPLE ID <br /> LIMIT MW 6 MW 7 MW 8 <br /> 071904 071904 071904 <br /> (pg/L) /L ( /L /L <br /> FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 ND ND ND <br /> IDi-isopropyl Ether (DIPE) 060 ND ND ND <br /> Ethyl tert-Butyl Ether (ETBE) 050 ND ND ND <br /> tert-Amyl Methyl Ether(TAME) 050 ND ND ND <br /> tert-Butanol (TBA) 20 ND ND ND <br /> VOLATILE HALOCARBONS <br /> 1,2-Dichloroethane (112-DCA) 050 ND ND ND <br /> Ethylene Dibromtde (EDB) 050 ND ND ND <br /> Report Limit Multiptication Factor 1 1 1 <br /> Surrogate Recoveries <br /> 1 2-Dichlaroethane-d4 102% 997% 103% <br /> Toluene-d8 103% 102% 944% <br /> Instrument ID HP 5972 MS <br /> Analytes reported as ND were not detected or below the Practical QuantltatiDn Limit <br /> Practical Quantitation Limit= Reporting Limit x Report Limit Multiplication Factor <br /> (pg/L)= micrograms r liter or part er billion(ppb) <br /> i <br /> ANALYST APPROVED BY <br /> Clan J Cone <br /> James Phr!lrps <br /> La story Director <br />