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A N A L Y T I C A L <br /> E LABORATORIES <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech Geotechnical Services Report Issue Date 03/30/94 <br /> 10624 Olive Avenue <br /> Oakdale, CA 95361 <br /> Submission Number 9902000483 Sample Date : 02/11/99Sample Time : 17:00 <br /> Lab Number 98891 Simple Type : LIQUID <br /> Project Number Disco <br /> Protect Desc. Ground Water Monitoring <br /> Sample Description NP-1-70' <br /> BSK LABORATORIES LUFi'ANALYSIS <br /> Date Date <br /> Method Analyte Prep. Anal. Result Units PQL Dil DLR <br /> { EPA 8015/ Benzene 02/23/99 02/23/99 7200 µg/L 0.3 2000 600 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Ethylbenzene 02/23/99 02/23/99 3400 µg/L 0.3 200 60 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Toluene 02/23/99 02/23/99 20000 jug/L 0.3 2000 600 <br /> -PA 8020 <br /> .MODIFIED) <br /> EPA 8015/ Xylenes,Total 02/23/99 02/23/99 19000 pg/L 0.3 2000 600 <br /> EPA 8020 <br /> (MODIFIED) <br /> I EPA 8015/ Gasoline 02/23/99 02/23/99 160000 µg/L. 50 200 10000 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Methyl-Cert-Butyl 02/23/99 02/23/99 ND pg/L 5 200 1000 <br /> EPA 8020; Ether <br /> (MODIFIED) <br /> ND None DetectedP�L Practical Quantitation Limit Conversions: <br /> mglL Milligrams/Liter — ppm Dll Dilution Factor 7 ppm = 7000 ppb <br /> yet, 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 /> i <br /> 1414 Stanislaus Street •. Fresno, CA 93706-1623 • Phone 559-497-2888, 1n CA 800-877-8310 Fax 559-485-6935 <br />