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i <br /> I 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 GeoEnvironmentai Inc Client Project ID Top Filling Sampled 06-05-02 <br /> of Northern California Reference Number 4758 Received 06-07-02 <br /> 837 Shaw Road Sample Description Water Extracted 06-07-02 <br /> Stockton CA 95215 Sample PreplAnalysis Method EPA 5030/8260 Analyzed 06-07-02 <br /> Attn Tim Cuellar Lab Numbers 4758-1W,2W,3W,4W, 5W Reported 06-12-02 <br /> I <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GC/MS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW 1 MW 2 MW 3 MW 4 MW S <br /> — 060502 060502 060502 060502 060502 <br /> (22/L) (ug/L) (ug/L) (uglL) (ug/L) (uc�/L)_ <br /> FUEL OXYGENATES <br />' Methyl tent-Butyl Ether(MTBE) 050 ND 1 7 130 ND ND <br /> Di-isopropyl Ether (DIPS) 050 ND ND ND ND ND <br />' Ethyl tert-Butyl Ether (ETRE) 050 ND ND ND ND ND <br /> tert-Amyl Methyl Ether(TAME) 0 50 ND ND ND ND ND <br /> lie <br /> tert-Butanol(TBA) 20 ND ND ND ND 120 <br />' VOLATILE HALOCARBONS <br /> 1,2-Dichloroethane (1,2-DCA) 0 50 ND ND ND ND ND <br /> Ethylene Dibromide (EDB) 050 ND ND ND ND ND <br />' Report Limit Multiplication Factor 1 1 10* 1 1 <br /> I <br /> Report limit raised due to matrix interference <br />' Surrogate Recoveries <br /> 1 2-Dichloroethane-d4 936% 946% 100% 869% 81 5% <br />' Toluene-d8 905% 965% 857% 958% 926% <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)= microgramsppr liter or pa a bill n(ppb) <br />' ANALYST APPROVED BY <br /> Clan J Cone 17abormatory <br /> e Phillips <br /> Director <br /> I <br />