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1 <br />lLABORATORIES <br />Certificate of Analysis <br />Jack Mendrin <br />West Star Environmental <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 />9805000274 <br />Sample Time <br />12:35 <br />Lab Number <br />59816 <br />Sample Type <br />SOLID <br />Project Number <br />9815012 <br />Project Desc. <br />Escalon <br />Sample Description <br />S-8, T-2, South @ 15' <br />Oxygenates by <br />GC/MS 8260M1 <br />Analyte <br />Result <br />Units <br />PQL Dil <br />DLR <br />Methyl -t -Butyl Ether <br />ND <br />µg/Kg <br />20 2.5 <br />50 <br />Di -isopropyl Ether <br />ND <br />µg/Kg <br />20 2.5 <br />50 <br />Ethyl t -Butyl Ether <br />ND <br />µg/Kg <br />20 2.5 <br />50 <br />t -Amyl Methyl Ether <br />ND <br />µg/Kg <br />20 2.5 <br />50 <br />ND None Detected PQL 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 />liekg Micrograms/Kilogram — ppb Higher 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 />