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A N A L Y T I C A L <br /> LABORATORIES <br /> i► Certificate of Analysis <br /> Don Light <br /> Del-Tech Geotechnical Services ' Preparation Date 09/11/98 <br /> 10624 Olive Avenue P <br /> Oakdale, CA 95361 Analysis Date 09/11/98 <br /> �` Report Issue Date 09/23/98 <br /> I <br /> 1 <br /> Sample Date 09/08/98 <br /> Submission Number 9809000283 ! Sample Time 14:00 <br /> Lab Number 76895 I Sample Type LIQUID <br /> Project Number <br /> Protect Desc. Calif. Welding,Tracy <br /> Sample Description MW-2 <br /> k <br /> Oxygenates by GUMS,(8260M1 <br /> i <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND µg/L j1 5.0 1 5 <br /> Di-isopropyl Ether ND µg/L I� 5.0 1 5 <br /> Ethyl t-Butyl Ether ND µg/L 1 5.0 1 5 <br /> t-Amyl Methyl Ether ND µg/L 5.0 1 5 <br /> tert-Butyl Alcohol ND µg/L ;! 50 1 50 <br /> ik <br /> I� <br /> 6 ' <br /> Ik <br /> is <br /> ii <br /> ! <br /> ji <br /> It <br /> I' <br /> 1 <br /> '( 0 C T 1 4. 1998 <br /> HUN i UR &.-ASSOC <br /> it <br /> t <br /> ND None Detect--d PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter v ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> µg/L Micrograms/Liter — ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm <br /> mg/kg Milligrams/Kilogram — ppm derived by(PQL x Dil)11 <br /> ,up,/kg Micrograms/Kilogram = ppb Higher limits may result from exceptional sample matrices or interferences <br /> 71 <br /> k <br /> i <br /> iyy <br /> it . <br /> 1414 Stanislaus S_.eet Fresno, CA 93706-1623 ' Phone 209-497-2888, In CA 800-877-8310 • Fax 209-485-6935 <br />