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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone (209)3842930 <br />' Certificate No 2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Cat Fuels Sampled 04-04-03 <br /> of Northern California Reference Number 5632 Received 04-08-03 <br />' 837 Shaw Road Sample Description Water Extracted 04-09-03 <br /> Stockton CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 04--09-03 <br /> Attn Tim Cuellar Lab Numbers 5632-6W, 7W 8W,9W 10W Reported 04-18-03 <br /> GASOLINE ADDITIVES AND SOLVENTS BY EPA METHOD 8260 GC/MS <br />' ANALYTE REPORTING SAMPLE ID SAMPLE 1D SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW 6 MW 7 MW 8 MW 9 MW 10 <br />' 040403 040403 040403 040403 040403 <br /> IL (u /L) (ug/L} (ug/L u IL) (ug/Ly <br /> FUEL OXYGENATES <br />' Methyl tent-Butyl Ether(MTBE) 050 ND ND ND ND ND <br /> Di-isopropyl Ether (RIPE) 050 ND ND ND ND ND <br />' Ethyl tert-Butyl Ether (ETRE) 050 ND ND ND ND ND <br /> tert-Amyl Methyt Ether(TAME) 050 ND ND ND ND ND <br />' tent-Butanol(TBA) 20 ND ND ND ND ND <br />' VOLATILE HALOCARBONS <br /> 1,2-Drchloroethane (1 2-DCA) 050 ND ND ND ND ND <br /> Ethylene Dibromide (EDB) 050 ND ND ND ND ND <br /> 1 <br /> Report Limit Multiplication Factor 1 1 1 1 1 <br /> Surrogate Recoveries <br /> 12-Dichloroethane-d4 100% 117% 120% 107% 115% <br /> 1Toluene-d8 - - 757% 751% 783% 717% 745% I <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 /> Practical Quantitation Limit=Reporting Limit x Report Limit Multiplication Factor <br /> (Ng/L)= micrograms per liter or part er billion(ppb) <br /> . ANALYST APPROVED BY O'L—ti Z// <br /> Clan J Cone Jams Phillips <br />' Lr ratory Director <br /> 1 <br />