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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (209) 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Flag City Chevron Sampled 11-10-98 <br /> of Northern California Reference Number 1850 Received 11 11 98 <br /> 4005 North Wilson Way Sample Description Water Extracted 11-16-98 <br /> Stockton, CA 95205 Sample Prep/Analysis Method EPA 5030!8015, 8020 Analyzed 11-16-98 <br /> Attn Tim Cuellar Lab Numbers 1850-6W, 7W Reported 11-18 98 <br /> TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> WITH BTEX DISTINCTION <br /> ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID <br /> MW 6Bl MW 71 <br /> 11-1098 11-10 98 <br /> (ug/L) (uglL) (ug/LJ <br /> MTBE 050 44 17 <br /> BENZENE 050 ND ND <br /> TOLUENE 050 ND ND <br /> ETHYL BENZENE 050 051 ND <br /> TOTAL XYLENES 050 ND ND <br /> GASOLINE RANGE <br /> HYDROCARBONS 50 ND ND <br /> IReport Limit Multiplication Factor 1 1 <br /> Report Limit Multlpllc <br /> Surrogate % Recovery FID 105%1 PID 104% FID 99 1%1PID 98 9% <br /> Instrument ID VAR-GC1 VAR GC1 <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 /> ANALYST APPROVED BY ° <br /> Clan J Cone ) es C'phlllips <br /> nvuonmental Lab Director <br />