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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 /> I 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 4758-11W, 12W, 13W, 14W, 15W Reported 06-17-02 <br /> I <br /> GASOLINE ADDITIVES BY EPA METHOD 8260 GC/MS <br /> ANALYTE REPORTING SAMPLE 10 SAMPLE 1D SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW 713 MW 7C MW 7D MW 7E VW 1$ <br /> I _ 060502 060502 060502 060502 060502 <br /> (pg/!-) (ug/L) (ug/L) (ug/L) (ug/L) (ug1 <br /> FUEL OXYGENATES <br />' Methyl tert-Butyl Ether(MTBE) 050 360 NO ND ND 120 <br /> Di-isopropyl Ether (DIPS) 050 ND NO ND ND NO <br />' Ethyl tert-Butyl Ether (ETRE) 050 ND NO ND ND ND <br />' tert-Amyl Methyl Ether(TAME) 050 ND NO NO ND ND <br /> tert-Butanol(TBA) 20 ND NO NO ND NO <br />' VOLATILE HALOCARBONS <br /> 1,2-Dichloroethane (1,2-DCA) 050 130 NO NO ND 140 <br />' Ethylene Dibromide (EDB) 050 ND NO NO ND 120 <br />' Report Limit Multiplication Factor 100* 1 1 1 100' <br /> 1 <br /> *Report limit raised due to matrix interference <br />' Surrogate Recoveries <br /> 1 2-Dichloroethane-d4 781% 803% 800% 880% 877% <br />' Toluene-d8 100% 977% 955% 100% 920% <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 />' (Ng/L)= micrograms liter r parts illi n( pb) <br />' ANALYST 6vAPPROVED B <br /> Clan J Cone J 1p <br /> h1 s <br /> aboratory Director <br />