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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-Tech Geocechnical 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 : 17:45 <br /> Lab Number 98874 Sample Type LIQUID <br /> Project Number Disco <br /> Protect Desc. Ground Water Monitoring <br /> j Sample Description MW-9 <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 ND jug/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Ethylbenxene 02/23/99 02/23/99 ND pg/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Toluene 02/23/99 02/23/99 ND µg/L 0.3 1 0.3 <br /> "PA 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 Ag/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 /> {MODIFIED) <br /> iND None DetectedPQL : Practical Quantitation Limit Conversions: <br /> { mg/L Milligrams/Liter = ppm DI . Dilution Factor i ppm = 1000 ppb <br /> µg/L Micrograms/Liter —,ppb DLR : Reportable Detection Limit i ppb = 0.001 ppm <br /> mg/kg Milligrams/Kilogram — ppm derived by(PQL x Dil) <br /> i pg/kg Micrograms/Kilogram - ppb Higher limits may result from exceptional sample matrices or interferences <br /> i <br /> ' 1414 Stanislaus Street Fresno, CA 93706-1623 Phone 559-497-2888, In CA 800-877-8310 0 Fax 559-485-6935 <br />