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I <br /> A N A L Y T I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> RDon Light <br /> Del-Tech Geotechnical Services Preparation Date 04/07/98 <br /> 10624 Olive Avenue Analysis Date 04/07/98 <br /> Oakdale, CA 95361 Report Issue Date 04/09/98 <br /> Sample Date 04/01/98 <br /> Submission Number 9804000121 Sample Time 00:00 <br /> Lab Number 55397 Sample Type LIQUID <br /> Project Number <br /> Project Desc. Valley Wholesale Drug <br /> Sample Description MW-1 <br /> I <br /> Ox enates by GUMS 8260M <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t Butyl Ether ND Ag/L 5.0 I 5 <br /> Di isopropyl Ether ND µg/L 5.0 1 5 <br /> Ethyl t•Butyl Ether ND µg/L 5.0 I 5 <br /> t-Amyl Methyl Ether ND µg/L 5.0 1 5 <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> gig/L Milligrams/Liter - ppm Di Dilution Factor I ppm 1000 ppb <br /> µg/L Micrograms/Liter - ppb DLR Reportable Detection Limit I ppb = 0.001 ppm <br /> mg/kg Milligrams/Kilogram - ppm derived by (PQL x Dil) <br /> µ Micrograms/Kilogram a ppb- Higher limits may result from exceptional sample matrices or interferences <br /> 1414 Stanislaus Street • Fresno, CA 93706 0 Phone 209-497-2888, In CA 800-877.8310 0 Fax 209-485-6935 <br />