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ANA LYTI CAL <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don L1gh1 <br /> Del-Tech Geotechnical Services Preparation Date 11/25/98 <br /> 10624 Olive Avenue Analysts Date 11/25/98 <br /> Oakdale, CA 95361 Report Issue Date 12/02/98 <br /> Submission Number 9811000367 Sample Date 11/13/98 <br /> Sample Time 1538 <br /> Lab Number <br /> 86370 Sample Type LIQUID <br /> Project Number George 8c Mae <br /> Project Desc 1600 Durham Ferry <br /> Sample Description MW-102 <br /> Oxygenates-by GUMS 8260M <br /> Analyte Result Units PQL Dil DLR <br /> Methyl t Butyl Ether ND pg/L 5 0 1 <br /> Di-isopropy] Ether ND /L 5 0 1 5 <br /> Ethyl t Butyl Ether ND pg <br /> 5 0 1 5 <br /> t-Amyl Methyl Ether ND /L 5 0 i <br /> tert-Butyl Alcohol NDg/L 50 1 50 <br /> w None DetectedPQL Practical Quantitation Limit Conversions <br /> Ing/L Milligrams/Liter pprn Dil Dilution Factor 1 ppm 1000 ppb <br /> g/L Micrograms/Liter = ppb DLR Reportable Detection Limit 1 ppb 0 001 ppm <br /> Milligrams/Kilogram — ppm derived by (PQL x Dil) <br /> Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> 1414 Stanislaus Street • Fresno, CA 93706-1623 • Phone 209-497-2888, In CA 800 877-8310 • Fax 209-485-6935 <br />