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A N A I Y I I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don 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 /> Sample Date 04/02/98 <br /> Submission Number 9804000122 Sample Time 00 00 <br /> Lab Number 55405 Sample Type LIQUID <br /> Project Number <br /> Protect Desc Castle Motors <br /> Sample Description MW-3 Grab <br /> Oxygenates by GUMS 8260M <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND /L 10 0 2 20 <br /> Di-isopropyl Ether 240 µVL 5 0 2 10 <br /> Ethyl t-Butyl Ether ND /L 5 0 2 10 <br /> t-Amyl Methyl Ether ND µg/L 5 0 2 10 <br /> 1D None DetectedP L Practical Quantitation Limit Conversions <br /> ig/L Mtll►grams/Etter = ppm Dil Dtlutton Factor 1 ppm = 1000 ppb <br /> g/L Micrograms/Liter — ppb DLR Reportable Detection Limit 1 ppb = 0 001 ppm <br />�g/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 Pay, 209-485-6935 <br />