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i <br /> IleCASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater CA 95309 Phone (209)3842930 <br />' Certificate No 2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Top Filling Sampled 09-04-02 <br />' of Northern California Reference Number 5034 Received 09-05-02 <br /> 837 Shaw Road Sample Description Water Extracted 09-11-02 <br /> Stockton, CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 09-11-02 <br /> Attn Tim Cuellar Lab Numbers 5034-11W, 12W, 13W, 14W 15W Reported 09-12-02 <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 7B MW 7C MW 7D MW 7E VW 1113 <br />' 09-04-02 09-04-02 09-04-02 09-04-02 09-04-02 <br /> - - -- (ug-1L)- (ug/L) (ug/L) --(ug1L)-- - (ug/L) --- - (ug/L) <br /> FUEL OXYGENATES <br />' Methyl tent-Butyl Ether(MTBE) 050 270 NO NO ND 95 <br /> Di-isopropyl Ether (DIPE) 0,10 ND ND NO ND ND <br />' Ethyl tert-Butyl Ether (ETRE) 050 ND ND NO ND ND <br /> tert-Amyl Methyl Ether(TAME) 050 NO ND NO ND ND <br />' • tert-Butanol (TBA) 20 NO NO ND ND ND <br />' VOLATILE HAL CARBONS <br /> 1 2-Dichloroethane (1 2-DCA) 050 130 ND NO ND 120 <br />' Ethylene Dibromide (EDB) 050 ND ND ND NO ND <br />' Report Limit Multiplication Factor 100* 1 1 1 100" <br /> *Report limit raised due to matrix interference <br />' Surrogate Recoveries <br /> 1,2-Dichloroethane-d4 82 1% 928% 908% 995% 890% <br />' Toluene-d8 103% 104% 976% 104% 105% <br /> Instrument ID HP 5972 MS <br /> Analytes reported as ND were not detected or below the Practical Quantitation Limit <br /> Practical Quantitation Lima=Reporting Limit x Report Limit Multiplication Factor <br />' (vg/L)= micrograms per liter or parts er billion(ppb) <br />' ANALYST APPROVED BY <br /> Clan J Cone Ja <br /> yKes C hrllrps <br /> laboratory Director <br />