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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Comfort Air, Inc Sampled 2-20-97 <br /> I of Northern California Reference Number 1023 Received 2-21-97 <br /> 1803 West March Lane, Suite A Sample Description Water Extracted 2-24-97 <br /> Stockton, CA 95207 Sample Prep/Analysis Method EPA 503018015, 8020 Analyzed 2-24-97 <br /> Attn Tim Cuellar Lab Numbers 1023-1 W, 2W, 3W, 4W, 5W Reported 3-3-97 <br /> I <br /> TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> WITH BTEX DISTINCTION <br /> ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> MW-1 MW-2 MW-3 MW-4 MW-5 <br /> (ug/L) (ug/L) (uglL) (ug1L) (uglL) (ug/L) <br /> MTBE 050 ND ND ND ND ND <br /> BENZENE 050 4700 99 5200 2 7 074 <br /> ITOLUENE 0 50 1000 71 1600 0 78 ND <br /> ETHYL BENZENE 0 50 1000 18 560 0 82 ND <br /> TOTAL XYLENES 050 1200 56 2200 067 061 <br /> I GASOLINE RANGE <br /> HYDROCARBONS 1 0 27000 1200 31000 ND 77 <br />' Report Limit Multiplication Factor 100 5 100 1 1 <br /> I <br /> Surrogate % Recovery FID 109%1 PID 104% FID 98 0%1 PID 98 4% FID 104%1 PID 101% ND 104%1 PID 102% FID 95 9%1 PID 96 5% <br /> IInstrument ID VAR GC1 VAR-GC1 VAR GC1 VAR GCI VAR-GC1 <br /> Practical Quantitation Limit = Reporting Limit x Report Limit Multiplication Factor <br /> Analytes reported as ND were not detected or below the Practical Quantitation Limit <br /> ANALYST APPROVED BY .�/ <br /> Clary J Cone ilnes C Phillips <br /> nvrronmental Lab Director <br /> I <br />