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A N A L Y I' 1 C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Dan Light <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 /> Submission Number 4804000122 Sample Date 04/02/98Sample Time 00 00 <br /> Lab Number 55406 Sample Type LIQUID <br /> Project Number <br /> Project Desc Castle Motors <br /> Sample Description 60 Castle St <br /> Oxygenates by GUMS-(8260M) <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND µg/L 10 0 1 10 <br /> Di-isopropyl Ether ND 14g/L 5 0 1 5 <br /> Ethyl t-Butyl Ether ND Pg/L 5 0 1 5 <br /> t-Amyl Methyl Ether ND Ag/1- 50 1 5 <br /> TD 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 a ppm derived by(PQL x Dil) <br />' Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> J <br /> 1414 Stanis[aus Street • Fresno, CA 93706 Phone 209-497-2888 In CA 800 877 8310 Fax 209 145-6935 <br />