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A N A L Y T I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Doff Llglli <br /> Del-Tech Geotechnical Services Preparation Date 04/06/98 <br /> 1062401 ve Avenue Analysis Date 04/06/98 <br /> Oakdale, CA 95361 Report Issue Date 04/15/98 <br /> Sample Date 04/01/98 <br /> Submission Number 9804000072 Sample Time 11:34 <br /> Lab Number 55151 Sample Type LIQUID <br /> Prolect Number <br /> Protect Desc. Valley Showcase <br /> Sample Description MW-1 Grab <br /> Oxygenates by GUMS (8260M) <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND IAg/L 5.0 1 5 <br /> Di-isopropyl Ether ND µg/L 5.0 1 5 <br /> Ethvl t-Butyl Ether ND µg/L 5.0 1 5 <br /> t-Amyl Methyl Ether ND µg/L 5.0 1 5 <br /> ' I <br /> I <br /> ND None Detected PQL 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 — ppm derived by(PQL x Dil) <br /> µg/kg Micrograms/Kilogram - ppb Higher limits may result from exceptional sample matrices or interferences <br /> 1414 Stanislaus Street • Fresno, CA 93706 Phone 209-497-2888, In CA 800-877-8310 Fax 209-485-6935 <br />