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A 1 IRLABORATORIES <br />BS <br />ND None DetectedPQL Practical Quantitation Limit Conversions: <br />mg/L Milligrams/Liter — ppm Di Dilution Factor 1 ppm = 1000 ppb <br />Ag/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 s 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 />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 />10:45 <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 <br />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 />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 DetectedPQL Practical Quantitation Limit Conversions: <br />mg/L Milligrams/Liter — ppm Di Dilution Factor 1 ppm = 1000 ppb <br />Ag/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 s 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 />