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t 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 GeoEnvironmental, Inc Client Project ID Pacific Car Wash Sampled 10-15-98 <br /> of Northern California Reference Number 1808 Received 10-20-98 <br />' 4005 North Wilson Way Sample Description Water Extracted 10-21-98 <br /> Stockton, CA 95205 Sample Prep/Analysis Method EPA 503018015, 8020 Analyzed 10-21-98 <br /> Ann Tim Cuellar Lab Numbers 1808-1W, 2W, 3W Reported 10-27-98 <br /> TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> WITH BTEX DISTINCTION <br /> ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE ID <br /> MW-7/ MW-8/ MW-9/ <br /> 10-15 98 10-15-98 10-15-98 <br /> (ug/L) (ug/L) (ug/L) (ug/L) <br /> MTBE 050 20 55 ND <br /> BENZENE 050 27 ND ND <br /> TOLUENE 050 ND NO ND <br /> ETHYL BENZENE 050 19 ND ND <br /> TOTAL XYLENES 050 43 ND ND <br />' GASOLINE RANGE <br /> HYDROCARBONS 50 2000 410 ND <br />' Report Limit Multiplication Factor 10 1 1 <br /> Report Limit Multiplication Factor MTBE only 2 <br /> 1 ' <br /> Surrogate °/a Recovery FID 109%1F 106% FID 100%1 P10104% FID 103%1 PID 105% <br /> Instrument ID 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 A'l APPROVED BY <br /> Clam J Cone Ja C Phillips <br /> vfronmental Lab Director <br />