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Ile <br /> 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 GeoE nviron mental 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 5034-6W 7W, 8W, 9W, 10W Reported 09-12-02 <br /> I <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GCIMS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW 6A MW 6B MW 6C MW 6D MW 6E <br /> I 09-04-02 09-04-02 09-04-02 09-04-02 09-04-02 <br /> -- (u_q/L) (ug/L) (ug/L) OWL) (ug/L) (ug/L) <br /> FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 43000 360 44 062 ND <br /> Di-isopropyl Ether (DIPE) 0511 NO 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 NO ND ND <br /> • tert Butanol(TBA) 20 ND ND NO ND NO <br /> V-QLATILE HALOCARBONS <br /> 1 2 Dichloroethane (1 2-DCA) 050 NO ND 096 ND NO <br /> Ethylene Drbromide (EDB) 050 ND ND ND ND ND <br /> Report Limit Multiplication Factor 2000" 20" 1 1 1 <br /> "Report limit raised due to matrix interference <br /> Surrogate Recoveries <br /> 1,2-Dichloroethane-d4 891% 837% 919% 888% 835% <br /> Toluene-d8 999% 109% 108% 977% 102% <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 liter or parts l2er billion (ppb) <br /> ANALYST ClanAPPROVED BY <br /> J Cone m C Phillips <br /> Laboratory Director <br />