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r ANA LYTI C- A- L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech Geotechnical Services <br /> 10624 Olive Avenue Preparation Date ; 04/06/98 <br /> Oakdale, CA 95361 Analysis Date 04/06/98 <br /> Report Issue Date 04/15/98 <br /> Submission dumber 9804000072 Sample Date 04/01/98 <br /> Lab NumberSample Time 10:43 <br /> Project Number 55149 Sample Type LIQUID <br /> Project Desc. Valley Showcase <br /> Sample Description MW-3 Grab <br /> Oxygenates by QC/MS ( 60M� <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND yg/L 5.0 1 <br /> Di-isopropyl Ether 5 <br /> Ethyl t-Butyl" Ether NSD yl/L 5.0 1 5 <br /> t-Amyl Methyl Ether µl5 1 5 <br /> ND kg/L 5.0 i 5 <br /> i . <br /> ND <br /> None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Di I Dilution Factor 1 ppm = 1000 ppb <br /> Frg/L Micrograms/Liter — ppb DLR Reportable Detection Limit 1 ppb = 0,001 ppm <br /> mg/kg Milligrams/Kilogram — ppm derived by(PQ <br /> L x Dil} <br /> �+ Micrograms/Kilogram = ppb Higher limits may result from exceptional sample matrices or interferences <br /> 14I4 Stanislaus Street Fresno, CA 93706 Phone 209-497-2888, In CA 800.877-8310 Fax 209-485-6935 <br />