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CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone {209} 384-2930 <br /> Certificate 112079 Fax {209} 384-1507 <br />' Advanced Geo Environmental, Inc Client Project ID Flag City Chevron Sampled See Below <br /> of Northern California Reference Number 1655 Received 7-1-98 <br /> 4005 North Wilson Way Sample Description Soil Extracted 7-2-98 <br />' Stockton, CA 95205 Sample Prep/Analysis Method EPA 5030/8015M, 8020 Analyzed 7-2-98 <br /> Attn Tim Cuellar Lab Numbers 1655-1 S, 2S, 3S,4S Reported 7-8-98 <br /> TOTAL PETROLEUM HYDROCARBONS - GASOLINE RANGE <br /> I WITH BTEX DISTINCTION <br />' ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> MW6-15 MW6-35 MW7-10 MW7-15 <br />' (mglkg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) <br /> MTBE 0 010 NO NO NO NO <br /> IBENZENE 00050 NO NO NO NO <br /> TOLUENE 00050 ND NO NO ND <br /> ETHYL BENZENE 00050 NO NO NO ND <br /> TOTAL XYLENES 00050 NO NO ND NO <br />' GASOLINE RANGE <br /> HYDROCARBONS 10 NO NO NO NO <br /> Report Limit Multiplication Factor 1 1 1 1 <br /> Date Sampled 6-29-98 6-29-98 6-30-98 6-3098 <br /> Surrogate % Recovery FID 65 5%f PID 65 2% FID 55 5%1 PID 58 3% FID 77 9%1 PID 76 0% FID 79 2%1 PID 79 1% <br /> Instrument ID VAR-GC1 VAR-GC1 VAR-GC1 VAR-GC1 <br /> Analytes reported as NO were not detected or below the Practical Quantitation Limit <br /> Practical Quantitation Limit = Reporting Limit x Report Limit Multiplication Factor <br /> ANALYST APPROVED BY <br /> Clary J Cone igmfes C Phillips <br /> nvrronmental Lab Director <br /> I <br />