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A <br />♦ t <br />LABORATORIES <br />Certificate of Analysis <br />Jack Mendrin <br />ND <br />ND <br />ND <br />µg/Kg 20 2.5 50 <br />µg/Kg 20 2.5 50 <br />µg/Kg 20 2.5 50 <br />t -Amyl Methyl Ether <br />West Star Environmental <br />µg/Kg 20 2.5 50 <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 />9805CO0274 <br />Sample Time <br />12:52 <br />Lab Number <br />59821 <br />Sample Type <br />SOLID <br />Project Number <br />9815012 <br />Project Desc. <br />Escalon <br />Sample Description <br />PS -2, South <br />Oxygenates by GC/MS (8260M) <br />Analyte <br />Result Units <br />PQL Dil <br />DLR <br />Methyl-t-Butvl Ether <br />Di -isopropyl Ether <br />Ethyl t -Butyl Ether <br />ND <br />ND <br />ND <br />µg/Kg 20 2.5 50 <br />µg/Kg 20 2.5 50 <br />µg/Kg 20 2.5 50 <br />t -Amyl Methyl Ether <br />ND <br />µg/Kg 20 2.5 50 <br />ND done Detected PQL Practical Quantitation Limit Conversions: <br />-,ng/'L Milligrams/Liter = ppm Dil Dilution Factor 1 ppm = 1000 ppb <br />ugiL Micrograms/ Liter = ppb DLR Reportabie Detection Limit 1 ppb = 0.001 ppm <br />mg/kg Milligrams/Kilogram = ppm der*ved by (PQL x DiI) <br />ug/kg Micrograms/Kilogram = ppb Higher limits may result from exceptional sample matrices or interferences <br />1414 Stanislaus Street • Fresno, CA 93706 ' Phone 209-497-2388, In CA 800-877-8310 ' Fax 209-485-6935 <br />