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A <br />l i <br />LABORATORIES <br />Certificate of Analysis <br />Jack Mendrin <br />ND ug/Kg 20 2.5 50 <br />Di -isopropyl Ether <br />ND µg/Kg 20 2.5 50 <br />West Star Environmental <br />ND µg/Kg 20 2.5 50 <br />Preparation Date <br />05/24/98 <br />4688 West Jennifer #101 <br />Analysis Date <br />05/24/98 <br />Fresno, CA 93722 <br />Report Issue Date <br />05/29/98 <br />Sample Date <br />05/11/93 <br />Submission Number <br />9805000274 <br />Sample Time <br />10:40 <br />Lab Number <br />59811 <br />Sample Type <br />SOLID <br />Project Number <br />9815012 <br />Project Desc. <br />Escalon <br />Sample Description <br />S-3, D-3, West @ 3' <br />Oxygenates by GUMS (8260M) <br />Analyte <br />Result Units <br />PQL Dil <br />DLR <br />Methyl -t -Butyl Ether <br />ND ug/Kg 20 2.5 50 <br />Di -isopropyl Ether <br />ND µg/Kg 20 2.5 50 <br />Ethvl t-Butvl Ether <br />ND µg/Kg 20 2.5 50 <br />t -Amyl Methyl Ether <br />ND deg/Kg 20 2.5 50 <br />ND done Detected PQL Practical Quantitation Limit Conversions: <br />mg/ L Llilligrams/ 1 - ter = ppm Dil Dilution Factor 1 ppm = 1000 ppb <br />ugi L Micrograms/ Liter ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm <br />mg/kg Milligrams/Kilogram = ppm derived by (PQL : Dil) <br />ugi kg Micrograms/Kilogram = ppb Higher limits may result from exceptional sample matrices or interferences <br />1414 Stanislaus Street ' Fresno, CA 93706 ' Phone 209-497-2388, In CA 800-877-8310 ' Fax 609-485-6935 <br />