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A <br />F r <br />LABORATORIES <br />B� <br />Certificate of Analysis <br />Jack Mendrin <br />West Star Environmental <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 />9805000274 <br />Sample Time <br />12:50 <br />Lab Number <br />59820 <br />Sample Type <br />SOLID <br />Project Number <br />9815012 <br />Project Desc. <br />Escalon <br />Sample Description <br />SP -2, North <br />Oxygenates <br />by <br />GC/MS (8260M) <br />Analyte <br />Result <br />Units <br />PQL Dil <br />DLR <br />Methyl -t -Butyl Ether <br />ND <br />µg/Kg <br />20 2.5 <br />50 <br />Di -isopropyl Ether <br />ND <br />µg/Kg <br />20 2.5 <br />50 <br />Ethyl t -Butyl Ether <br />ND <br />µg/Kg <br />20 2.5 <br />50 <br />t -Amyl Methyl Ether <br />ND <br />µg/Kg <br />20 2.5 <br />50 <br />ND None DetectedPQL Practical Quantitation Limit Conversions: <br />mg/L Milligrams/Liter =ppm Di[ 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) <br />µg/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 800-877-8310 ' Fax 209-485-6935 <br />