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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 2-25-99 <br /> of Northern California Reference Number 2090 Received 3-2-99 <br />' 4005 North Wilson Way Sample Description Water Extracted 3-3-99 <br /> Stockton, CA 95205 Sample Prep/Analysis Method EPA 503018015, 8020 Analyzed 3-3-99 <br /> Attn Tim Cuellar Lab Numbers 2090-1 W, 2W, 3W, 4W, 5W Reported 3-10-99 <br /> TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> WITH BTEX DISTINCTION <br /> I ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE 1D SAMPLE ID SAMPLE ID <br /> MW-11 MW-21 MW-5/ MW-4/ MW-6A/ <br /> 2-25-99 2-25-99 2-25-99 225-99 2-25 99 <br /> tug/L) lug/L) (ug/L) (ug/L) (ug/L) (ug/L) <br /> MTBE 050 1000 60 068 30 38 <br /> BENZENE 0 50 ND ND ND ND ND <br /> TOLUENE 050 ND ND ND ND ND <br /> ETHYL BENZENE 050 ND ND ND ND ND <br /> TOTAL XYLENES 050 ND ND ND ND ND <br /> I GASOLINE RANGE <br /> HYDROCARBONS 50 430 ND ND ND ND <br /> Report Limit Multiplication Factor 5 1 1 1 1 <br /> Report Limit Multiplication Factor MTBE only 50 5 <br /> Surrogate % Recovery Fi0 122%1 PID 118% FID 110%1 PID 103% FID 117%!PI0104% FID 102%1 PID 102% FID 102%1 PID 141% <br /> iii Instrument 1D VAR-GC1 VAR-GC1 VAR-GC1 VAR-GC1 VAR-GC1 <br /> IAnalytes 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 WVIi APPROVED BY <br /> Carr J Cone J C Ph, fps <br /> nvrronmental Lab Director <br />