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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br /> Certificate 112079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Comfort Air Sampled 2-29 96 <br /> of Northern California Reference Number 686 Received 3-1-96 <br /> 1803 West March Lane, Suite A Sample Description Water Extracted 3-5-96 <br /> Stockton, CA 95207 Sample Prep/Analysis Method 8015M, 8020 Analyzed 3-5-96 <br /> AM Tim Cuellar Lab Numbers 686-IW Reported 3-11-96 <br /> L- :1 <br /> TOTAL PETROLEUM HYDROCARBONS -GASOLINE RANGE <br /> WITH BTEX DISTINCTION <br /> ANALYTE REPORTING LIMIT SAMPLE ID <br /> MW-4 <br /> (ug/L) (ug/L) <br /> MTBE 050 ND <br /> BENZENE 0 50 69 <br /> TOLUENE 050 ND <br /> ETHYL BENZENE 050 1 4 <br /> TOTAL XYLENES 050 ND <br /> GASOLINE RANGE <br /> HYDROCARBONS 50 330 <br /> Report Limit Multiplication Factor 2 <br /> Surrogate % Recovery FID-99 9%1 PID 99 3% <br /> Instrument ID 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 mes C Phillips <br /> Environmental Lab Director <br />