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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 Geotechnical Services Report Issue Date 03/12/99 <br /> 10624 Olive Avenue <br /> Oakdale, CA 95361 <br /> Sample Date 02/10/99 <br /> Submission Number 9902000483 Sample Time 15:47 <br /> ELab Number : 98901 Sample Type : LIQUID <br /> Project Number Diso <br /> Project Desc. Ground Water Monitoring <br /> Sample Description MW-7S$$ <br /> BSK LABORATORIES LUIS I'ANALYSIS <br /> Date Date <br /> Method Analyte Prep. Anal. Result Units PQL Dil DLR <br /> l EPA 8015/ Benzene 03/05/99 03/05/99 ND µg/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Ethylbenzene 03/05/99 03/05/99 ND jug/L 0.3 1 0.3 <br /> EPA 8020 <br /> "MODIFIED) <br /> l <br /> r.PA 8015/ Toluene 03/05/99 03/05/99 ND µg/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Xylenes,Total 03/05/99 03/05/99 ND µg/L 0.3 1 0.3 <br /> fEPA 8020 <br /> (MODIFIED) <br /> EPA 8013/ Gasoline 03/05/99 03/05/99 ND jeg/L 50 1 50 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Methyl-tert-Butyl 03/05/99 03/05/99 ND ug/L 5 1 5 <br /> f EPA 8020 Ether <br /> i (MODIFIED) <br /> I , <br /> ND None DetectedPQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Di 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 A ppm derived by(PQL x Dil) <br /> /kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> 1414 Stanislaus Street 0 Fresno, CA 93706-1623 • Phone 559-497-2888, in CA 800-877-8310 • Fax 559-485-6935 <br />