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' 4 <br />A N A L Y I C A L <br />LABORATORIES <br />Certificate of Analysis <br />Jack Mendrin <br />West Star Environmental <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 />9805000274 <br />Sample Time <br />10:28 <br />Lab Number <br />59809 <br />Sample Type <br />SOLID <br />Project Number <br />9815012 <br />Project Desc. <br />Escalon <br />Sample Description <br />S-1, D-1, East @ 3' <br />Oxygenates by GC/MS 8260M� <br />Analyte <br />Result <br />Units <br />PQL Dil <br />DLR <br />Methyl -t -Butyl Ether <br />ND <br />µg/Kg <br />50 5 <br />250 <br />Di -isopropyl Ether <br />ND <br />µg/Kg <br />50 5 <br />250 <br />Ethyl t -Butyl Ether <br />ND <br />µg/Kg <br />50 5 <br />250 <br />t -Amyl Methyl Ether <br />ND <br />Mcg/Kg <br />50 5 <br />250 <br />:vD None Detected PQL Practical Quantitation Limit Conversions: <br />mg/L Milligrams/Liter = ppm Dil Dilution Factor 1 ppm = 1000 ppb <br />ftg/L Micrograms/Liter = ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm <br />mg/k; Milligrams/Kilogram = ppm derived by (PQL x Dii) <br />�5%kg Micrograms/Kilogram =ppb Hither 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 />