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A N A L Y T I C A L <br /> © LABORAIORIES <br /> Certificate of Analysis <br /> ion Li <br /> 7e1-Tec Geotechnical Services Preparation Date 04/07/98 <br /> 0624 Olive Avenue Analysis Date 04/07/98 <br /> Dakdale, CA 95361 Report Issue Date 04/09/98 <br /> Sample Date 03/30/98 <br /> ubmission Number 98040001 _f) Sample Time 0000 <br />-ab Number 553y2 Sample Type LIQUID <br />'rolect Number <br />'rolect Desc Montas Br-) <br /> ample Description NII 3 Gi 1D <br /> c)x aenates by GC/MS 8260M <br /> malyte Result Units PQL DO DLR <br /> 4ethyl-t-Butyl Ether ND ug/L 50 2 10 <br />)i-isopropyl Ether ND ug/L 50 2 10 <br /> thyl t-Butyl Ether ND ug/L 50 2 10 <br /> Amyl Methyl Ether ND ug/L 50 2 10 <br /> i <br /> DD None Detected PQL Practical Quantitation Limit Conversions <br /> g/L Milligrams/Liter — ppm Dil Dilution Factor 1 ppm = 1000 ppb <br />;/L Micrograms/Luer ppl) DLR Reportable Detection Limit 1 ppb 0 001 ppm <br /> g/ Milligrarns/Kilogram a pp n derived by(PQL x Dil) <br /> f Micrograms/KiIograin •• pleb- Higher limits may result from exceptional sample matrices or interferences <br /> 1414 Stanislaus Street • I r,- no, C f 93706 Phone 209-497-2888, In CA 800-877-8310 0 Fax 209-485-6935 <br />