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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 Nomellini Construction Sampled 2 26-97 <br />' of Northern California Reference Number 1029 Received 2-28-97 <br /> 1803 West March Lane, Suite A Sample Description Water Extracted 3-6-97 <br /> Stockton, CA 95207 Sample PreplAnalysis Method 8015M, 8020 Analyzed 3-6-97 <br />' Attn Tim Cuellar Lab Numbers 1029-1W, 2W, 3W, 4W, 5W Reported 3 9 97 <br />' TOTAL PETROLEUM HYDROCARBONS - GASOLINE RANGE <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 /> (uglL) (uglL) (ug/L) Jug/L) (ug/L) Jug/L) <br />' MTBE 0 50 ND 140 ND ND 3 8 <br />' BENZENE 050 1400 3500 2400 2100 ND <br /> TOLUENE 050 500 100 700 36 ND <br /> ETHYL BENZENE 050 140 160 270 300 ND <br /> TOTAL XYLENES 050 590 79 640 150 ND <br />' GASOLINE RANGE <br /> HYDROCARBONS 50 10000 8300 11000 6700 ND <br />' Report Limit Multiplication Factor 100 100 200 50 1 <br /> ISurrogate % Recovery FID 99 0%1 Pio 97 9% FID 90 3%1 PID-97 3% FID 102%1 PID 101% FID 10&%f PID 103% FID 97 5%1 PID 97 7% <br /> Instrument 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 /> ANALYS APPROVED BY <br /> Clary J Cone Ja s C Phillips <br /> E vrronmental Lab Director <br /> I <br />