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( <br /> LABORATORIES <br /> Certificate of Analysis <br /> CDan Light <br /> Del-Tech Geotechnical Services Preparation Date 04/07/99 <br /> LIC624Olive Avenue <br />� Analysis Date 04/07/99 <br /> Oakdale, CA 95361 Report Issue Date 04/14/99 <br /> Sample Date 03/25/99 <br /> [Submission dumber 9903000814 Sample Time 12:30 <br /> Lab dumber 104960 Sample Type LIQUID <br /> Project Number Valley Showcase <br /> Protect Desc. G.W. Monitoring <br /> Sample Description MW-4, <br /> Oxvo enates by GUMS 826CM <br /> [Analyte <br /> Result Units PQL Dil DLR <br /> LMethyl-t-Butyl Ether ND µg/L 7.0 1 5 <br /> Di-isopropyl Ether ND µg/L 5.0 1 5 <br /> ELhvI t-Bucy] Ether ND µg/L 5.0 1 5 <br /> t-rlrrtyl Methvl Ether IVD µ L 5.0 1 5 <br /> tert $un l alcohol ND ug/L 50 1 50 <br /> f <br /> �I <br />'G <br /> L\D gone DetectedPQL Practicai Quantitation Limit Conversions: <br /> mg/t \-L"11igrams/Liter = pom Dil Dilution Factor 1 ppm = 1000 ppb <br /> u�/L %I:c:ograms/Liter ppb DLA Reportable Detection Limit 1 ppb = 0.001 ppm <br /> Lmg'/kg Milligrams/Kilogram a ppm derived by (PQL x Dil) M <br /> %I:crograms%Kilogram y ppb Higher limits may result from exceptional sample matrices or interferences <br /> :414 Stanislaus Street Fresno, CA 93706-1623 Phone 559-497-288N, In CA H0-S"7-, 310 Fax <br />