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i <br />' 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 Pro)ect ID Top Filling Sampled 6-12-98 <br /> of Northern California Reference Number 1630 Received 6-16-98 <br /> 4005 North Wilson Way Sample Description Water Extracted 6-19-98 <br /> Stockton, CA 95205 Sample Prep/Analysis Method EPA 503018015, 8020 Analyzed 6-19-98 <br /> Ann Tim Cuellar Lab Numbers 1630-1 W, 2W, 3W, 4W, 5W Reported 6-23-98 <br /> TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> WITH BTEX DISTINCTION <br /> ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> 1MW-1/ MW-2/ MW-31 MW-4/ MW-5/ <br /> 6-12-98 6-12-98 6-12-98 6-12-98 6-12-98 <br /> (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) <br /> MTBE 050 ND ND 13 ND ND <br /> BENZENE 050 ND 99 17 ND 40 <br /> TOLUENE 050 ND ND ND ND ND <br /> ETHYL BENZENE 060 ND 15 ND ND 100 <br /> TOTAL XYLENES 050 ND 86 ND ND 76 <br /> GASOLINE RANGE <br /> HYDROCARBONS 50 ND 560 92 ND 950 <br /> Report Limit Multiplication Factor 1 5 1 t 10 <br /> Surrogate % Recovery FID 96 4%f PID 86 1% FID 103%1 PID 96 1% FID 104%f PID 99 3% FID 94 9%1 PID 95 1% FID 112%/PID 105% <br /> IInstrument 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 Ja a hr rps <br /> nvrronmental Lab Director <br />