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A N A L Y I C A L <br />LABORATORIES <br />Certificate of Analysis <br />Jack Mendrin <br />West Star Environmental <br />ND pig/Kg 20 2.5 50 <br />Preparation Date <br />05/24/98 <br />4688 West Jennifer #101 <br />ND µg/Kg, 20 2.5 50 <br />Analysis Date <br />05/24/98 <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 />12:00 <br />Lab Number <br />59813 <br />Sample Type <br />SOLID <br />Project Number <br />9815012 <br />Project Desc. <br />Escalon <br />Sample Description <br />S-5, T-1, North @ 15' <br />Oxygenates by GC/MS (8260M) <br />Analyte <br />Result Units <br />PQL Dil <br />DLR <br />Methyl -t -Butyl Ether <br />ND pig/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 Methvl Ether <br />ND µg/Kg 20 2.5 50 <br />ND done Detected PQL Practical Quantitation Limit Conversions: <br />m7/ L Milligrams/Liter = ppm Dil Dilution Factor t ppm = 1000 ppb <br />Li,/L Micrograms/Liter = ppb DLR Reportable Detection Limit i ppb = 0.001 ppm <br />mg/kg Milligrams/Kilogram = ppm derived by (PQL x Dil) <br />ug/kg Micrograms/Kilogram = ppb Higher limits may result frorn exceptional ;amoie matrices or interferences <br />1.114 Stanislaus Street 0 Fresno, CA 93706 ' Phone 209-497-2388, In CA 800-877-8310 ' Fax 209-485-6935 <br />