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D A N A L Y T I C A L <br /> 3 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 99020004.83 Sample Time 17:30 <br /> Lab Number 98892 Sample Type : LIQUID <br /> Protect Number Disco <br /> Project Desc. Ground Water Monitoring <br /> Sample Description NP-1-80' <br /> BSK LABORATORIES LUFT ANALYSIS <br /> Date Date <br /> Method Analyte Prep. Anal. Result Units PQL Dil DLR <br /> EPA 8015/ Benzene 02/23/99 02/23/99 24000 gg/L 0.3 2000 600 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Ethylbenzene 02/23/99 02/23/99 2500 pg/L 0.3 200 60 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Toluene 02/23/99 02/23/99 26000 µg/L 0.3 2000 600 <br /> I 'EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Xylenes,Total 02/23/99 02/23/99 15000 ug/L 0.3 200 60 <br /> EPA 8020 <br /> (MODIFIED) <br /> j EPA 8015/ GasoIine 02/23/99 02/23/99 140000 µg/L 50 200 10000 <br /> ! EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ MethyI-tert-Butyl 02/23/99 02/23/99 ND ttg/L 5 200 1000 <br /> EPA 8020 Ether <br /> (MODIFIED) <br /> i <br /> ND None Detected P L Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> µg/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 /> �. 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 Fax 559-485-6935 <br />