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A N A L Y l I C A ! <br /> WRLABORATORIES <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech Geotechnical Services Preparation Date 04/09/98 <br /> 10524 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 00 00 <br /> Lab Number 55404 Sample Type LIQUID <br /> Project Number <br /> Project Desc Castle Motors <br /> Sample Description MW-4 Grab <br /> Oxygenates by GUMS (,8260M) <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND pg/L 100 2 20 <br /> Di-isopropyl Ether 83 pg/L 5 0 2 10 <br /> Ethyl t-Butyl Ether ND ug/L 5 0 2 10 <br /> t-Amyl Methyl Ether ND ug/L 5 0 2 10 <br /> 0 <br /> I\1D None Detected P L Practical Quantitation Limit Conversions <br /> mg/L Milligrams/Liter e ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> u.g/L Micrograms/Liter c ppb DLR Reportable Detection Limit 1 ppb = 0 001 ppm <br /> ng/kg Milligrams/Kilogram — ppm derived by (PQL x Dil) <br /> 4g/k 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 8110 fax 209-485-6935 <br />