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A N A L Y T I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don Light <br /> De!-Tech Geotechnical Services Preparation Date 04/06/98 <br /> 10624 Olive Avenue Analysis Date : 04/06/98 <br /> Oakdale, CA 95361 Report Issue Date 0.4/15/98 <br /> Submission Number 9804000072 Sample Date 04/01/98 <br /> Lab NumberSample Time 11:07 <br /> 55150 <br /> Protect Number Sample Type LIQUID <br /> Project Desc, Valley Showcase <br /> Sample Description MW-4 Grab <br /> Oxygenates by GC/MS (8260M) <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND pg/L 5.0 1 <br /> Di-isopropyl Ether ND pg/L 5A $1 5 <br /> Ethyl t-Butyl Ether ND pg/L 5.0 1 5 <br /> t-Amyl Methyl Ether ND pg/L 5.0 1 5 <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Dl Dilution Factor 1 ppm 1000 ppb <br /> = <br /> µg/L Micrograms/Liter a ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm <br /> mg/kg Milligrams/Kilogram — ppm derived by(PQL x Dil) <br /> ,ug/kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> 1414 Stanislaus Street 0 Fresno, CA 93706 Phone 209-497-2888, In CA 800-877-8310 Fax 209-485-6935 <br />