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A N A L Y- T I C A L11 t <br /> LABORA <br /> TORIES" <br /> s Certificate of Analysis <br /> Don Li <br /> $ht <br /> Del-Tech Geotechnical Services Preparation Date 10/06/98- <br /> 10624 Olive Avenue Analysis Date. : 10/06/98 <br /> Oakdale, CA 95361 Report Issue Date : 10/15/98 <br /> Sample Date 09/23/98 <br /> Submission Number 9809000817 t Sample Time 00:00 <br /> Lab Number 79703 Sample Type SOLID <br /> Project Number 3012 E.Waterloa <br /> Proiject Desc. Advanced Auto <br /> Sample Description Pipeline 1-6' <br /> Oxygenates by GC/MS (8260M) <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND Pg/Kg 20, 1 _ _20 <br /> Di-isopropyl Ether ND pg/Kg 20 1 20 <br /> Ethyl t-Butyl Ether ND µg/Kg 20 1• 20 <br /> t-Amyl Methyl Ether ND µg/Kg 20' 1 20 <br /> tert-Butyl Alcohol - ND µg/Kg 200 1 200 <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter = ppm Di Dilution Factor 1 ppm 1000 ppb <br /> µg/L 1 ppb 0.001 ppm <br /> Micrograms/Liter = ppb DLR Reportable Detection Limit <br /> mg/kg Milligrams/Kilogram = ppm derived by(PQL x Dil) <br /> Itekg, Micrograms/Kilogram = ppb Higher limits may result from exceptional sample matrices or interferences <br /> 1414 Stanislaus Street Fresno, CA 93706-1623" • 'Phone 209.-49"7-2888, In CA 800-877-8310 Fax 209-485-6935 <br />