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M <br /> A N A L Y T I C A L <br /> 101 <br /> LABORATORIES <br /> Aw� <br /> Certificate of Analysis <br /> 'Don Light <br /> Del-Tech Georechnical Services Preparation Date 04/07/98 <br /> 10624 Olive Avenue Analysis Date 04/07/98 <br /> Oakdale, CA 95361 Report Issue Date 04/09/98 <br /> Sample Date 04/01/98 <br /> Submission Number 9804000121 Sample Time 00:00 <br /> Lab Number 55399 Sample Type LIQUID <br /> Project Number <br /> Project Desc. Valley Wholesale Drug <br /> Sample Description MW-2 <br /> Oxygenates by GUMS (8260M) <br /> Analyte Result Units PQL Dil DLR <br /> Nlethyl-t-Butyl Ether ND /L 5.0 ! <br /> Di-isopropyl Ether ND 14g/L 5.0 1 5 <br /> Ethyl t-Butyl-Ether ND jug/L 5.0 1 5 <br /> t-Amyl Methyl Ether ND µg/L 5.0 1 5 <br /> ND None Detected PL Practical Quantitation Limit Conversions: <br /> jg/L Milligrams/Liter a ppm Di Dilution Factor 1 ppm = 1000 ppb <br /> pg/L Micrograms/Liter ppb DLR Reportable Detection Limit 1 ppb = 0,001 ppm <br /> mg/kg Milligrams/Kilogram — ppm derived by (PQL x Dil) <br /> µ <br /> 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 />