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CASTLE ANALYTICAL LABORATORY <br /> Environmentai Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (209)384-2930 <br /> ICertificate#2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmentai, Inc Client Project ID Cal Fuels Sampled 03-19-04 <br /> I of Northern California Reference Number 6789 Received 03-23-04 <br /> 837 Shaw Road Sample Description Water Extracted 04-02-04 <br /> Stockton,CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 04-02-04 <br /> Attn Tim Cuellar Lab Numbers 6789-16W, 17W, 18W, 19W Reported 04-06-04 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GC/MS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW 13A MW 13B MW 13C MW 2 <br /> I 031904 031904 031904 031904 <br /> ( /L) <br /> FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 ND ND ND ND <br /> DE-isopropyl Ether (DIPE) 0 50 NO NO NO NO <br /> Ethyl tert-Butyl Ether (ETBE) 0150 NO NO NO NO <br /> tert-Amyl Methyi Ether(TAME) 0 50 NO NO ND ND <br /> Cert-Butanol(TSA) 20 ND NO NO ND <br /> VOLATILE HALOCARSONS <br /> 1,2-Dichlorcethane (1 2-DCA) 050 ND ND NO ND <br /> Ethylene Dibromide (EDB) 050 NO NO NO ND <br /> Report Limit Multiplication Factor 1 1 5" 1 <br /> .Increased reporting limit due to matnx interferences <br /> Surrogate Recoveries <br /> 1 2-Dtchloroethane-d4 824% 741% 837% 864% <br /> Toluene-d8 915% 694% 102% 766% <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 /> (Ng/L)= micrograms ZRI <br /> liter or parts per billion(ppb) <br /> IAPPROVED BY APPROVED BY 9/ A <br /> Clan J Cone Ja a rllrps <br /> Laboratory onager ,,*oratory Director <br /> I <br />