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CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services P 0 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 Prep/Analysis Method 8015M, 8020 Analyzed 3 6-97 <br />' AM Tim Cuellar Lab Numbers 1029 6W, 7W, 8W, 9W 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 <br /> MW-6 MW-7 MW-8 MW-9 <br />' (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) <br /> MTBE 050 ND ND ND ND <br />' BENZENE 050 ND 130 14 ND <br /> TOLUENE 0 50 ND 68 1 3 ND <br /> ETHYL BENZENE 0 50 ND 25 2 6 ND <br /> TOTAL XYLENES 050 ND 20 1 2 ND <br /> GASOLINE RANGE <br /> HYDROCARBONS 50 ND 2400 ND NO <br /> Report Limit Multiplication Factor 1 10 1 1 <br />' Surrogate % Recovery FID 103%1 PID 102% FID-131%1 PID 112% FID 99 2%1 PID 97 3% FID 96 9%1 PID 96 7% <br /> Instrument 10 VAR-GC1 VAR GCI VAR-GC1 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 /> I 1 <br /> ANALYST (A4-40�2 APPROVED BY <br /> clary J Cone Ja s Phillips <br /> nwronmental Lab Director <br /> 1 <br />