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I <br /> Ile 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 GeoEnv iron menta I 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 Prep/Analysis Method EPA 5030!8260 Analyzed 09-11-02 <br /> Attn Tim Cuellar Lab Numbers 5034-16W, 17W, 18W Reported 09-12-02 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GC/MS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT VW 1C VW 2A VW 3A <br /> 09-04-02 09-04-02 09-04-02 <br /> (pg/L u !L (ug/L (u !L) <br /> FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 ND 250 32 <br /> Ds-isopropyl Ether (DIPE) 1151 ND ND NO <br /> Ethyl tert-Butyl Ether (ETRE) 050 NO ND NO <br /> tert-Amyl Methyl Ether(TAME) 050 ND ND ND <br /> tert-Butanoi(TBA) 20 ND NO ND <br /> IVOLATILE HALOCARBONS <br /> 1 2-Dichloroethane (1 2-DCA) 050 60 130 ND <br /> IEthylene Dibromide (EDB) 050 NO ND ND <br /> IReport Limit Multiplication Factor 100* 100* 10* <br /> "Report limit raised due to matrix interference <br /> iSurrogate Recoveries <br /> 1,2-Dichloroethane-d4 839% 840% 882% <br /> Toluene-d8 105% 103% 106% <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 (pglL)= micrograms per liter or parts per billion(ppb) <br /> ANALYST—jye6? APPROVED BY <br /> Clary J Cone J es <br /> Phr!&ps <br /> raboratory Director <br /> I <br />