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A <br />1- <br />LABORATORIES <br />Jack Mendrin <br />West Star Environmental <br />4688 West Jennifer ;#101 <br />Fresno, CA 93722 <br />Certificate of Analysis <br />Preparation Date 05/25/98 <br />Analysis Date 05/25/98 <br />Report Issue Date 05/29/98 <br />Submission Number 9805000274 <br />Lab Number 59817 <br />Project Number 9815012 <br />Project Desc. Escalon <br />Sample Description S-9, T-3, North @ 15' <br />Oxygenates by GC/MS (8260M) <br />Analvte Result units PQL <br />Sample Date 05/11/98 <br />Sample Time 12:45 <br />Sample Type SOLID <br />Dil DLR <br />Methyl -t -Butyl Ether <br />ND <br />µg/Kg 20 2.5 50 <br />Di -isopropyl Ether <br />ND <br />µg/K- 20 2.5 50 <br />Ethyl t -Butyl Ether <br />ND <br />1,V0 20 2.5 50 <br />t -Amyl Me[hyl Ether <br />ND <br />µg/Kg 20 2.5 50 <br />N'D None Detected PQL Practical Quantitation Limit Conversions: <br />mg/ Milligrams/ Liter = ppm Dil Dilution Factor I ppm = 1000 ppb <br />ye 'i L Micrograms/Liter = ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm <br />mg/kg Milligrams/Kilogram = ppm derived by (PQL x DID <br />µg/kg Micrograms/Kilogram = ppb Higher limits may result from exceptional sample matrices or interferences <br />141.1 Stanislaus Street ' Fresno, CA 937/06 ' Phone 209-497-2888, In CA 800-877-8310 ® Fax 209-485-6935 <br />