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LABORATORIES <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 />12:25 <br />Lab Number <br />59819 <br />Sample Type <br />SOLID <br />Project Number <br />9815012 <br />Project Desc. <br />Escalon <br />Sample Description <br />SP -1 <br />OYyg enates by <br />GC/MS 8260M) <br />Analyte <br />Result <br />Units PQL Dil <br />DLR <br />Methyl -t -Butyl Ether ND µg/Kg 20 2.5 50 <br />Di -isopropyl Ether ND µg/Kg 20 2.5 50 <br />Ethvl t -Butyl Ether ND ug/Kg 20 2.5 50 <br />t -Amyl Methyl Ether ND µg/Kg 20 2.5 50 <br />\�D None Detected PC)L Practical Quantitation Limit Conversions: <br />m�. L N11111 -rams' =ppm Dil Dilution Factor 1 ppm = 1000 ppb <br />u ;' L Micrograms/Liter - ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm <br />k; Mill igrams,`Kilo-ram = ppm derived by (PQL x Dil) <br />U"" kg viicrogramsi Kilogram - ppb Higher limits may result from exceptional sample rnatnces or interferences <br />1414 Stanislaus Street ® Fresno, CA 93706 ® Phone 209-497-2888, In CA 300-377-8310 ® Fax 209-485-6935 <br />