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ANALYT I CAL <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech Geotechnical Services Preparation Date 04/24/98 <br /> 10624 Olive Avenue Analysis Date 04/24/98 <br /> Oakdale, CA 95361 Report Issue Date 04/29/98 <br /> Sample Date : 04/17/98 <br /> Submission Number 9804000585 Sample Time 17:29 <br /> Lab Number 57582 Sample Type LIQUID <br /> Project Number Quarterly GW <br /> Project Desc. Delmonte <br /> Sample Description SUE-North Grab <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 pg/L 5.0 1 5 <br /> Ethyl t-Butyl Ether ND 1.g1L 5.0 1 5 <br /> t-Amyl Methyl Ether ND pg/L 5.0 1 5 <br /> ND None DetectedPQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter 3 ppm Dil Dilution Factor 1 ppm 1000 ppb <br /> Ag/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 /> pg/kg Micrograms/Kilogram = ppb Higher limits may result from exceptional sample matrices or interferences <br /> t <br /> 1414 Stanislaus Street 4 Fresno, CA 93706 0 Phone 209-497-2888, In CA 800.877-8310 0 Fax 209-485-6935 <br />