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A N A L Y T 1 {_ A I <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don Ltgllt <br /> Del-Tech Geotechnical Services Preparation Date 04/09/98 <br /> 10624 Olive Avenue Analysts 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 00 00 <br /> Lab Number 55402 Sample Type LIQUID <br /> Project Number <br /> Project Desc Castle Motors <br /> Sample Description MW-6 Grab <br /> Oxygenates by GUMS 8260M <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether NDL 100 2 20 <br /> Di-isopropyl Ether ND jug//L 5 0 2 10 <br /> Ethyl t-Butyl Ether ND pg/L 5 0 2 10 <br /> t-Amyl Methyl Ether ND pg/L 5 0 2 10 <br /> 0 <br /> ID None DetectedPQL Practical Quantitation Limit Conversions <br /> ig/L Milligrams/Liter ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> g/L Micrograms/Liter — ppb DLR Reportable Detection Limit 1 ppb = 0 001 ppm <br /> ig/kg Milligrams/Kilogram = ppm derived by(PQL x Dil) <br /> g/ 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 1 Fax 209-485 6935 <br />