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i <br /> A N A L Y T I C A L <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 02/11/99 <br /> Submission Number 9902000483 Sample Time 11:18 <br /> Lab Number 98877 Sample Type LIQUID <br /> Project Number Disco <br /> Project Desc. Ground Water Monitoring <br /> Sample Description MW-8S <br /> BSK LABORATORIES LUFT ANALYSIS <br /> 1 Date Date <br /> Method Analyte Prep. Anal. Result Units PQL Dil DLR <br /> j EPA 8015/ Benzene 02/23/99 02/23/99 ND ug/L 0.3 1 0.3 <br /> '. EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Ethylbenzene 02/23/99 02/23/99 ND lig/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Toluene 02/23/99 02/23/99 ND ug/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Xylenes,Total 02/23/99 02/23/99 ND Mcg/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Gasoline 02/23/99 02/23/99 ND ug/L 50 1 50 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Methyl-tert-Butyl 02/23/99 02/23/99 ND µg/L 5 1 5 <br /> EPA 8020 Ether <br /> f (MODIFIED) <br /> I <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Dil Dilution Factor <br /> ppm = 1000 ppb <br /> ug/L Micrograms/Liter — ppb DLA 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 /> i <br /> 1414 Stanislaus Street Fresno, CA 9370.6-1623 Phone 559-497-2888, In CA 800-877-8310 Fax 559-485-6935 <br />