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s A N A 1 C A I <br /> LABORATORIES <br /> Certificate of Analysis <br /> DonLight <br /> Del-,'ech 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 /> Submission Number 9804000122 Sample Sample Date /98 <br /> Time 00 00 <br /> Lab Number 55403 Sample Type LIQUID <br /> Project Number <br /> Project Desc Castle Motors <br /> Sample Description MW-2 Grab <br /> Oxygenates by GUMS 8260M <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Bu l Ether ND pg/L 10 0 2 20 <br /> Di-isopropyl Ether ND pg/L 50 2 10 <br /> Ethyl t-Butyl Ether ND pg/L 50 2 10 <br /> t-Amyl Methyl Ether ND pg/L 5 0 2 10 <br /> 0 <br /> ND None DetectedPQL Practical Quantitation Limit Conversions <br /> mg/L Milligrams/Liter a ppm D`1 Dilution Factor 1 ppm = 1000 ppb <br /> pg/L Micrograms/Liter — ppb DLR Reportable Detection Limit 1 ppb = 0 001 ppm <br /> mg/kg Mtlltgrams/Kilogram — ppm derived by(PQL x Dtl) <br /> p Mtcrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> 16/k <br /> 1414 Stanislaus Street Fresno, CA 93706 Phone 209-497-2888 [n CA 800-877 8310 far 209-485-6935 <br />