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A N A L Y T I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don L' ht <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 15:48 <br /> Lab Number 98870 Sample Type : LIQUID <br /> Project Number Disco <br /> Project Desc. Ground Water Monitoring <br /> Sample Description MW-7S <br /> BSK LABORATORIES LUFT ANALYSIS <br /> Date Date <br /> Method Analyte Prep. Anal. Result Units PQL Dil DLR <br /> i EPA 8015 / Benzene 02/20/99 02/20/99 ND µg/L 0.3 1 0.3 <br /> } EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Ethylbenzene 02/20/99 02/20/99 ND jug/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Toluene 02/20/99 02/20/99 ND pg/L 0.3 1 0.3 <br /> 'PA 8020 <br /> IMOD IFIED) <br /> EPA 8015/ Xylenes, Total 02/20/99 02/20/99 ND 1cg/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Gasoline 02/20/99 02/20/99 110 Mcg/L 50 1 50 <br /> EPA 8020 Lighter boiling-point hydrocarbons decreased relative to standard. <br /> (MODIFIED) <br /> EPA 8015/ Methyl-tent-Butyl 02/20/99 02/20/99 ND Pg/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 Dif Dilution Factor 1 ppm = 1000 ppb <br /> jueL Micrograms/Liter — ppb DLR Reportable Detection Limit i ppb'= 0.001 ppm <br /> mg/kg Milligrams/Kilogram — ppm derived by(PQL x Dil) <br /> µg/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 0 Fax 559-485-6935 <br />