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A N A L Y T I C A L <br /> LABORATORIES #. <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tedi Geotechnical Services Report Issue Date 03/30/99 <br /> 10624 Olive Avenue <br /> Oakdale, CA 95361 <br /> Sample Date 02/10/99 <br /> Submission Number 9902000483 Sample Time 13:11 <br /> Lab Number 98867 Sample Type LIQUID <br /> Project Number Disco <br /> Project Desc. Ground Water Monitoring <br /> Sample Description MW-6 <br /> BSK LABORATORIES LUFT ANALYSIS <br /> Date Date <br /> Method Analyte Prep. Anal. Result Units PQL Dil DLR <br /> EPA 8015/ Benzene 02/20/99 02/20/99 ND ug/L 0.3 1 0.3 1S <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Ethylbenzene 02/20/99 02/20/99 ND µg/L 0.3 1 0.3 J <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Toluene 02/20/99 02/20/99 ND ug/L 0.3 1 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Xylenes, Total 02/20/99 02/20/99 ND ug/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Gasoline 02/20/99 02/20/99 ND ug/L 50 1 50 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Methyl-tert-Butyl 02/20/99 02/20/99 ND µg/L 5 1 5 <br /> EPA 8020 Ether <br /> (MODIFIED) <br /> f <br /> r <br /> ND None Detected PQ L Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Mil Dilution Factor 1 ppm = 1000 ppb <br /> ug/L Micrograms/Liter — ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm <br /> mg/kg Milligrams/Kilogram — ppm derived by(PQL x Dil) ` <br /> ug/kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices,or interferences !� <br /> 1414 Stanislaus Street Fresno, CA 93706-1623 + Phone 559-497-2888, In CA 800-877-8310 Fax 559-485-6935 <br />