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CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (209) 384-2930 <br /> Certifcate#1-2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Cal Fuels Sampled 12-19-01 <br />' of Northern California Reference Number 4310 Received 12-20-01 <br /> 837 Shaw Road Sample Description Water Extracted 12-31-01 <br /> Stockton, CA 95215 Sample Prep/Analysis Method EPA 50301$260 Analyzed 12-31-01 <br /> Attn Tim Cuellar Lab Numbers 4310-16W 17W Reportea 1-4-02 <br />' GASOLINE ADDITIVES BY EPA METHOD 8260 GC/MS <br /> ANALYTE REPORTING SAMPLE ID SAMPLE 1D <br />' LIMIT AW 2A AW 2B <br /> 121901 121901 <br /> ( /L) u It 1 (u /L) <br /> FUEL OXYGENATES <br /> Methyl tert-Butyl Ether(MTBE) 050 NO NO <br /> IDi-isopropyl Ether (DIPS) 050 ND NO <br /> Ethyl tert-Butyl Ether (ETRE) 050 ND ND <br /> tent-Amyl Methyl Ether(TAME) 0 50 ND NO <br /> tert-Butanol (TSA) 20 ND NO <br /> VOLATILE HALOCARBON-S <br /> 1 2-Dichloroethane (1 2-DCA) 050 NO NO <br /> EEthylene Dbromide (EDB) 050 NO NO <br /> Report Limit Mulbpliration Factor 50` 50' <br /> 'Increased reporting limit due to matrix interferences <br /> Surrogate Recoveries <br /> 1 2-Dichloreethane-d4 823% 843% <br /> Toluene-d8 110% 113% <br /> Instrument ID HP 5972MS <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)= micrograms per liter or partspe billion(ppb) <br /> ANALYST APPROVED BY <br /> C,an J Cone .lap ies Phrllfps <br /> 6oratory Director <br /> fff <br />