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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 GeoEnvironmental, 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 5290-16W 17W, 18W Reported 12-23-02 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GC/MS <br /> I <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT VW 2A VW 3A VW1C <br /> 12/04/02 12/04/02 12/04/02 <br /> (pg/L) (ug/L) ^ (ug/L) (u9/L) <br />' FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 190 370 20 <br /> Di-isopropyl Ether (DIPS) 050 ND ND ND <br /> Ethyl tort-Butyl Ether (ETRE) 050 ND ND ND <br />' tert-Amyl Methyl Ether(TAME) 050 ND 11 ND <br /> tert-Butanol(TBA) 20 ND ND ND <br />' VOLATILE HALOCARBONS <br /> 1 2-DEchloroethane (1,2-DCA) 050 180 37 66 <br /> Ethylene Dibromide (EDB) 050 12 ND 49 <br />' Report Limit Multiplication Factor 10" 1 10" <br /> Report Limit Multiplication Factor for MTBE 20 <br /> I <br /> `Report limit raised due to matrix interference <br /> ISurrogate Recoveries <br /> 1,2-Dichloroethane-d4 100% 112% 913% <br /> Toluene-d8 119% 109% 103% <br /> Instrument ID Varian Saturn 3 MS&HP 5972 MS <br /> Analytes reported as ND were not detected or below the Practical Quantitation Limit <br /> I Practical Quantitation Limit=Reporting Limit x Report Limit Multtplicabon Factor <br /> (Ng/L)= micrograms ppr liter or parts pe n(ppb) <br /> 1 7 <br /> f <br /> ANALYST APPROVED BY 3-1/11/1 <br /> Clan J Cone J m s d PERI <br /> aboratory Director <br /> I <br />