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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 Comfort Air Sampled See Below <br /> I of Northern California Reference Number 3288 Received 10-31-00 <br /> 4005 North Wilson Way Sample Description Soil Extracted 11-1-00 <br /> Stockton,CA 95205 Sample Prep/Analysis Method EPA 503018015M,8020 Analyzed 11-1-00 <br /> Attn Paul Dotson Lab Numbers 3288-6S,7S,8S, 9S, 10S Reported 11-7-00 <br /> I <br /> I TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> WITH BTEX DISTINCTION <br /> ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> MW 6-65 MW 7-15 MW 7-20 MW 7-30 MW 8-15 <br /> (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) <br /> MTBE 0 010 ND ND ND ND ND <br /> BENZENE 00050 026 ND ND ND ND <br /> TOLUENE 00050 1 3 ND ND ND ND <br /> ETHYL BENZENE 00050 027 ND ND ND ND <br /> • TOTAL XYLENES 00050 14 ND ND ND ND <br /> GASOLINE RANGE 10 18 ND ND ND ND <br /> HYDROCARBONS <br /> Report Limit Multiplication Factor 1 1 1 1 1 <br /> Report Limit Multiplication Factor Toluene only 100 <br /> Date Sampled 10-25-00 10-26-00 10-26-00 10-26-00 10-26-00 <br /> I <br /> Surrogate% Recovery FID 97 0%1 PID 819% FID 791%I PID 800% FID 7ZI%l PID 717% FID 758%I PID 783% FID 777%%PID 783% <br /> Instrument ID VAR-GC1 VAR-GC1 VAR-GC1 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 *is C Phillips <br /> Laboratory arrector <br />