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A N A L Y T I C A L <br /> LABORATORIES <br /> r� <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/IO/99 <br /> Submission Number 9902000483 Sample Time 16:24 f <br /> Lab Number 98872 Sample Type LIQUID <br /> Project Number Disco <br /> Project Desc. Ground Water Monitoring J <br /> Sample Description MW-7D i <br /> BSK LABORATORIES LUFT ANALYSIS I <br /> Date Date <br /> Method Analyte Prep. Anal. Result Units PQL Dii DLR <br /> EPA 8015/ Benzene 02/20/99 02/20/99 ND µg/L 0.3 1 0.3 .I <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 0.3 1 0 <br /> EPA 8020 <br /> (MODIFIED) <br /> c <br /> EPA 8015/ Xylenes,Total 02/20/99 02/20/99 0.37 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> I ' <br /> EPA 8015/ Gasoline 02/20/99 02/20/99 300 ug/L 50 1 50 <br /> EPA 8020 Lighter boiling-point hydrocarbons decreased relative to standard. <br /> {MODIFIED) f <br /> EPA 8015/ Methyl-tert-Butyl 02/20/99 02/20/99 ND 5 1 5 ! , <br /> EPA 8020 Ether <br /> (MODIFIED) <br /> i <br /> �4 <br /> I <br /> ND None Detected Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm NiNl Dilution Factor 1 ppm = 1000 ppb <br /> ug/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 /> pg/kg Micrograms/Kilogram - ppb Higher limits may result from exceptional sample matrices or interferences <br /> } <br /> 1414 Stanislaus Street Fresno, CA 93706-1623 Phone 559-497-2888, In CA 800-877-8310 9 Fax 559-485-6935 <br />