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A <br />1 <br />LABORATORIES <br />'ilethyl-t-Butyl Ether <br />ND µg/Kg 20 2.5 50 <br />Certificate of Analysis <br />Jack Mendrin <br />Ethyl t -Butyl Ether <br />ND µg/Kg 20 2.5 50 <br />t -Amyl Methyl Ether <br />West Star Environmental <br />Preparation Date <br />05/25/98 <br />4688 West Jennifer 7101 <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 />13:06 <br />Lab Number <br />5982.4 <br />Sample Type <br />SOLID <br />Project Number <br />9815012 <br />Project Desc. <br />Escalon <br />Sample Description <br />SP -3, West <br />Oxygenates by GC/MS 8260M) <br />Analyte <br />Result Units <br />PQL Dil <br />DLR <br />'ilethyl-t-Butyl Ether <br />ND µg/Kg 20 2.5 50 <br />Di -isopropyl Ether <br />ND µg/Kg 20 2.5 50 <br />Ethyl t -Butyl Ether <br />ND µg/Kg 20 2.5 50 <br />t -Amyl Methyl Ether <br />ND µg /Kg 20 2.5 50 <br />ND done DetectedP L Practical Quantitation Limit Conversions: <br />,n,;,/ L Milligrams/ Liter = ppm Di Dilution Factor 1 ppm = 1000 ppb <br />u /L Micrograms/Liter — ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm <br />mgikg "Milligrams/Kilogram = ppm derived by (PQL x Dil) <br />ug/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 />