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11mosA NALAI CAL <br />LABORATORIES <br />Jack Mendrin <br />West Star Environmental <br />4688 West Jennifer #101 <br />Fresno, CA 93722 <br />Certificate of Analysis <br />Preparation Date <br />05/24/98 <br />Analysis Date <br />05/24/98 <br />Report Issue Date <br />05/29/98 <br />Submission Number 9805000274 <br />Lab Number 59814 <br />Project Number 9815012 <br />Project Desc. Escalon <br />Sample Description S-69 T-1, South 0 15' <br />Oxygenates by GC/MS (8260M) <br />Analyte Result Units PQL <br />Sample Date 05/11/98 <br />Sample Time 12:10 <br />Sample Type SOLID <br />Dil DLR <br />Methyl -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 ug/Kg 20 2.5 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 0 Fresno, CA 93706 ° Phone 209-497-2888, In CA 800-877-8310 ° Fax 209-485-6935 <br />