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A N A L Y T I C A L <br />LABORATORIES <br />Certificate of Analysis <br />Jack Mendrin <br />ND µg/Kg 20 2.5 50 <br />Di -isopropyl Ether <br />ND peKg 20 2.5 50 <br />ND 20 2.5 50 <br />West Star Environmental <br />Mcg/Kg <br />Preparation Date <br />05/25/98 <br />4688 West Jennifer #101 <br />Analysis Date <br />05/25/98 <br />Fresno, CA 93722 <br />Report Issue Date <br />05/29/98 <br />Sample Date <br />05/11/98 <br />Submission Number <br />980500027.1 <br />Sample Time <br />13:00 <br />Lab Number <br />59822 <br />Sample Type <br />SOLID <br />Project Number <br />9815012 <br />Project Dese. <br />Escalon <br />Sample Description <br />SP -3, East <br />Oxygenates by <br />GC/MS (82601 1) <br />Analyte <br />Result <br />Units PQL Dil <br />DLR <br />Methyl -t -Butyl Ether <br />ND µg/Kg 20 2.5 50 <br />Di -isopropyl Ether <br />ND peKg 20 2.5 50 <br />ND 20 2.5 50 <br />Ethyl t -Butyl Ether <br />Mcg/Kg <br />t -Amyl Methyl Ether <br />ND µg/Kg 20 2.5 50 <br />ND None Detected PQL Practical Quantitation Limit Conversions: <br />mg% L Milligrams/'Liter = ppm Dil Dilution Factor 1 ppm = 1000 ppb <br />Etg/L )vticrograms/ Liter = ppb DLR Reportable Detection '-."mit 1 ppb = 0.001 ppm <br />mg%kg Milligrams/ Kilogram = opm derived by (PQL x Dii) <br />µ kg 'Micrograms/Kilogram = opb Higher limits may resuit trom exceptional sample matrices or interferences <br />1414 Stanislaus Street • Fresno, CA 93706 ` Phone 209-497-2888, In CA 300-877-8310 ' Fax 209-435-6935 <br />