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I <br />' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone (209)384-2930 <br />' Certificate No 2480 Fax (209)384-1507 <br /> Advanced Geo Environmental, Inc Client Project ID Top Filling Sampled 12-04-02 <br />' of Northern California Reference Number 5290 Received 12-05-02 <br /> 837 Shaw Road Sample Description Water Extracted 12-09-02 <br /> Stockton,CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 12-09-02 <br /> Attn Tim Cuellar Lab Numbers 5290-11W, 12W, 13W, 14W, 15W Reported 12-23-02 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GC/MS <br /> 1 <br /> ANALYTE REPORTING SAMPLE ID SAMPLE 10 SAMPLE ID SAMPLE ID SAMPLE ID <br />' LIMIT MW 7A MW 78 MW 7C MW 7D MW 7E <br /> 12/04/02 12/04/02 12/04/02 12/04/02 12/04/02 <br /> (pg/L) (u /L) (ug/L (ug/L (ug/L u /L <br />' FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 200 250 15 NO NO <br />' Di-isopropyl Ether (DIPE) 050 NO ND NO NO NO <br /> Ethyl tert-Butyl Ether (ETBE) 050 NO ND ND NO ND <br />� . tert-Amyl Methyl Ether(TAME) 050 NO NO NO ND ND <br /> tert-Butanol(TBA) 20 NO ND NO NO ND <br />' VOLATILE HALOCARBONS <br /> 1,2-Dichloroethane (1 2-DCA) 050 11 120 067 ND NO <br />' Ethylene Dibromide (EDB) 050 ND ND NO ND ND <br />' Report Limit Multiplication Factor 20* 20* 1 1 1 <br /> 1 <br /> `Report limit raised due to matrix interference <br /> tSurrogate Recoveries <br /> 1,2-Dichioroethane-d4 917% 997% 870% 102% 995% <br />' Toluene-d8 102% 970% 102% 939% 951% <br /> Instrument ID Varian Saturn 3 M5&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 /> (ug/L)= micrograms per li er o art per billion(ppb) <br /> ANALYST APPROVED BY <br />' Clan J Cone gJaA, G Phillipsatory Director <br />