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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 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 Prep/Analysis Method EPA 5030/8260 Analyzed 06-07-02 <br /> Attn Tim Cuellar Lab Numbers 4758-6W, 7W,8W,9W, 10W Reported 06-17-02 <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GC/MS <br /> IANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE fD SAMPLE ID <br /> LIMIT MW 6A MW 613 MW 6C MW 6D MW 6E <br /> 060502 060502 060502 060502 060502 <br /> (N211-) (ug/!-) (ug1L) (ug/L) (ug/L) ug/L) <br /> FUEL OXYGENATES <br />' Methyl tert-Butyl Ether(MTBE) 050 14000 410 17 7 2 37 <br /> D,-isopropyl Ether (DIPE) 050 NO NO NO ND ND <br /> Ethyl tert-Butyl Ether (ETBE) 050 NO NO NO ND NO <br />' tert-Amyl Methyl Ether(TAME) 050 NO NO ND ND NO <br /> tert-Butanol(TBA) 20 NO NO ND ND NO <br />' VOLATILE HALOCARSONS <br /> 12-Dichloroethane (1,2-DCA) 050 ND 47 12 ND ND <br />' Ethylene Dibromide (EDB) 050 ND ND ND ND ND <br />' Report Limit Multiplication Factor 50* 50* 1 1 1 <br /> Report Limit Multiplication Factor for MTBE 1000 <br /> *Report limit raised due to matrix interference <br />' Surrogate Recovenes <br /> 1 2-Dichloroethane-d4 774% 821% 864% 935% 781% <br />' Toluene-d8 976% 927% 110% 104% 934% <br /> Instrument ID HP 5972 MS <br /> Analytes reported as ND were not detected or below the Practical Quantitation Limit <br />' Practical Quontdation Limit=Reporting mit x Report Limit Multiplication Factor <br /> (pg/L)= microgram er Mer or pa per illion(ppb) <br /> (: <br />' ANALYST APPROVED BY <br /> Clan J Cone J Phiffil <br /> aboratory Director <br />