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A N A L Y T I C A L <br /> ' LABORATORIES <br /> Don LihCertificate of Analysis <br /> gt <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 Number 9804000072 Sample Date 04/01/98 <br /> Lab Number 55152 Sample Time 11:57 <br /> Project Number Sample Type LIQUID <br /> Project Desc. Valley Showcase <br /> Sample Description MW-2 Grab <br /> Oxygenates 6 GC/M5 8260M <br /> Analyte <br /> Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND <br /> Di-isopropyl Ether ND ug/L 5.0 1 5 <br /> Ethyl t-Butyl Ether ND µg/L 5.0 1 5 <br /> t-Amyl Methyl Ether ND pg/L 5.0 1 5 <br /> Jug/L 5.0 1 5 <br /> ND None Detected <br /> m L PQL : Practical Quantitation Limit <br /> Z;/ Milligrams/Liter = ppm Di Dilution Factor Conversions: <br /> mg/k Micrograms/Liter — ppb DLR Reportable Detection Limit 1 ppm = 1000 ppb <br /> g g Milligrams/Kilogram �. ppm derived by{PQL x Dil} 1 ppb = 0.001 ppm <br /> �g/ Micrograms/Kilogram — ppb Higher limas may result from exceptional sample matrices or interferences <br /> - ences <br /> 1414 Stanislaus Street • Fresno, CA 93706 Phone 209-497-2888, In CA 800-877.8310 0 Fax 209-485-6935 <br />