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A N A L Y T I C A L <br /> f : <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech 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 : 16:24 <br /> Lab Number . 98872 Sample Type LIQUID <br /> Proiect Number . Disco <br /> Project Desc. : Ground Water Monitoring <br /> Sample Description MW-71) <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 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Ethylbenzene 02/20/99 02/20/99 ND pg/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Toluene 02/20/99 02/20/99 ND jcg/L 0.3 1 0.3 <br /> '.PA 8020 <br /> �MODIFLED) <br /> EPA 8015/ Xylenes,Total 02/20/99 02/20/99 0.37 ug/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Gasoline 02/20/99 02/20/99 300 µg/L 50 1 50 <br /> EPA 8020 Lighter boiling-point hydrocarbons decreased relative to standard. <br /> (MODIFIED) <br /> EPA 8015/ Methyl-tert-Butyl 02/20/99 02/20/99 ND jeg/L 5 1 5 <br /> EPA 8020 Ether <br /> (MODIFIED) <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Dil Dilution Factor I ppm = 1000 ppb <br /> yg/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 /> yg/kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> 1 <br /> 1414 Stanislaus Street • Fresno, CA 93706-1623 0 Phone 559-497-2888, In CA 800-877-8310 • Fax 559-485-6935 <br />