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A N A L Y I i C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don Ltght <br /> Del-Tech Geotechnical Services Preparation Date 04/09/98 <br /> 10624 Olive Avenue Analysis Date 04/09/98 <br /> Oakdale, CA 95361 Report Issue Date 04/14/98 <br /> Sample Date 04/02/98 <br /> Submission Number 9804000122 Sample Time 0000 <br /> Lab Number 55401 Sample Type LIQUID <br /> Protect Number <br /> Piolec.t Desc Castle Motors <br /> Sample Description MW-5 Grab <br /> Oxygenates by GUMS (8260M� <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND Ag/L 10 0 2 20 <br /> Di-isopropyl Ether ND 11g/1. 5 0 2 10 <br /> Ethyl t-Butyl Ether ND µg/L 5 0 2 10 <br /> t-Amyl Methyl Ether ND µg/L 5 0 2 10 <br /> I <br /> s <br /> STD None Detected PQL Practical Quantitation Limit Conversions <br /> ng/L Milligrams/Liter = ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> g/L Micrograms/Liter — ppb DLR Reportable Detection Limit 3 ppb = 0 001 ppm <br /> ig/kg Milligrams/Kilogram — ppm derived by(PQL x Dil) <br /> g6 Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> 1434 Stanislaus Street • Fresno, CA 93706 Phone 209 497 2888 In CA 900-877 8110 I,:\ 209 19" 0935 <br />