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L <br /> Alpha Analytical Laboratories Inc. 860 Waugh Lane, H-1, Ukiah, California 95482 <br /> Order#A00070610 '-mail: clientservices@alpha-labs.com Phone: (707) 468-0401 Fax: (707) 468P5 ��1 <br /> July 12,2000 <br /> Advanced Geo Environmental <br /> 4005 N. Wilson Way <br /> �+ Stockton, CA 95205 <br /> Quality Control Report <br /> L.� <br /> Matrbc Duplicate <br /> Spike Spike <br /> L Method Recovery Recovery RPD <br /> Blank % % % <br /> Matrix: Aqueous <br /> QC Batch MJS14/2040 <br /> Benzene ND 100.4 102.6 2.2 <br /> Toluene ND 92.2 95.2 3.2 <br /> Ethylbenzene ND 90.0 93.6 3.9 <br /> m,p-Xylene ND 91.5 93.7 2.4 <br /> Methyl-t-butyl ether ND 90.1 87.5 2.9 <br /> Diisopropyl ether ND 119.2 123.2 3.3 <br /> Ethyl-t-butyl ether ND 90.3 91.5 1.3 <br /> Tert-amyl mehtyl ether ND 99.5 102.2 2.7 <br /> r Tert-Butanol ND 90.3 91.5 1.3 , <br /> Lr <br /> This batch passes method quality control acceptance criteria. <br /> ND=none detected Bruce L.Gove,Laboratory Director <br />