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A <br />LABORATORIESa r <br />Certificate of Analysis <br />Jack Mendrin <br />ND µg/Kg 20 25 50 <br />Di -isopropyl Ether <br />ND µg/Kg 20 2.5 50 <br />West Star Environmental <br />ND gVKg 20 2.5 50 <br />Preparation Date <br />05/24/98 <br />4688 West Jennifer #101 <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 />980500027.1 <br />Sample Time <br />10:45 <br />Lab Number <br />59812 <br />Sample Type <br />SOLID <br />Project Number <br />9815012 <br />Project Desc. <br />Escalon <br />Sample Description <br />S-4, D-4, East @ 3' <br />Oxygenates by GC/MS 8260M) <br />Analyte <br />Result Units <br />PQL Dil <br />DLR <br />4lethyl-t-Butyl Ether <br />ND µg/Kg 20 25 50 <br />Di -isopropyl Ether <br />ND µg/Kg 20 2.5 50 <br />Ethyl t -Butyl Ether <br />ND gVKg 20 2.5 50 <br />t -Amyl Methyl Ether <br />ND ,ug/Kg 20 2.5 50 <br />ND None DetectedPCL Practicai Quantitation Limit Conversions: <br />mg/L Milligrams/Liter =ppm Dil Dilution : ictor 1 ppm = 1000 ppb <br />4,1L <br />. Micrograms/ Liter - ppb DLR Reportabie Detection Limit 1 ppb = 0.001 ppm <br />mg/kg Milligrams/ Kilogram = ppm derived by TQL x Dil) <br />µg/kg Micrograms/Kilogram = ppb Higher limits :nay 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 />