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(116 <br />A N A L Y I C A L <br />LABORATORIES <br />Certificate of Analysis <br />Jack Mendrin <br />West Star Environmental <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 />05/11/98 <br />Submission Number <br />9805000274 <br />Sample Time <br />12:28 <br />Lab Number <br />59815 <br />Sample Type <br />SOLID <br />Project Number <br />9815012 <br />Project Desc. <br />Escalon <br />Sample Description <br />S-7, T-2, North @ 14.5' <br />Oxyc,enates by GC/MS (8260M) <br />Analyte <br />Result Units <br />PQL Dil <br />DLR <br />Methyl -t -Butyl Ether ND µg/Kg 20 2.5 50 <br />Di -isopropyl Ether ND µg/Kg 20 2.5 50 <br />Ethvl t-Butvl Ether ND µg/Kg 20 2.5 50 <br />t -Amyl Methyl Ether ND µg/Kg 20 2.5 50 <br />ND None Detected PQL Practical Quantitation Limit Conversions: <br />mg/ L vlilligrams/Liter = ppm Dil Dilution Factor 1 ppm = 1000 ppb <br />uti L Micrograms/ Liter = ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm <br />m /kg Milligrams/Kilogram = ppm derived by !PQL x Dii) <br />µ/ kg Micrograms/Kilogram = ppb Higher limits may result from exceptional sample matrices or interferences <br />1414 Stanislaus Street ° Fresno, CA 93706 ' Phone 209-497-2888, In CA 300-877-8310 9 Fax 209-485-6935 <br />