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I CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone (209)384-2930 <br /> iCertificate No 2480 Fax (209)384-1507 <br /> Advanced Geo E nviron mental Inc Client Project ID Top Filling Sampled 09-04-02 <br /> i 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 PreplAnalysis Method EPA 5030/8260 Analyzed 09-11-02 <br /> Attn Tim Cuellar Lab Numbers 5034-1W,2W, 3W,4W,5W Reported 09-12-02 <br /> i <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GCIMS <br /> iANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE 10 <br /> LIMIT MW 1 MW 2 MW 3 MW 4 MW 5 <br /> i pg09-04-02 09-04-02 09-04-02 09-04-02 09-04-02 <br /> L)—- -- (ug/L) (uglL) (ug/L)-___ (ug/L) _---- (ug/L) <br /> FUEL OXYGENATES <br /> iMethyl tert-Butyl Ether(MTBE) 050 ND 15 110 ND ND <br /> Di-isopropyl Ether (DIPS) 050 ND ND ND ND ND <br /> iEthyl tart-Butyl Ether (ETBE) 050 ND ND ND ND ND <br /> tert-Amyl Methyl Ether(TAME) 050 ND ND ND ND ND <br /> i . tart-Butanol(TBA) 20 ND 30 ND ND 110 <br /> iVOLATILE HALOCARBONS <br /> 1,2-Dichloroethane (1,2-DCA) 050 ND ND ND ND ND <br /> iEthylene Dibromide (EDB) 050 ND ND ND ND ND <br /> iReport Limit Multiplication Factor 1 1 20* 1 1 <br /> i <br /> "Report limit raised due to matrix interference <br /> iSurrogate Recoveries <br /> 1,2-Dichloroethane-d4 898% 931% 855% 850% 890% <br /> i Toluene-d8 100% 107% 105% 100% 960% <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 /> i (pg/L)= micrograms r liter or pa r bi n (ppb) <br /> i ANALYST APPROVED BY <br /> Clan J Cone Ja s hr rps <br /> aboratory Director <br /> i <br />