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r i <br /> 4 T <br /> Alpha Analytical Laboratories Inc. 860 Waugh Lane, H-1, Ukiah, California 95482 <br /> Odder#A00062919 e-mail: clientservices®alpha-labs.com Phone: (707) 468-0461 Fax: (707)468p5a E�1 <br /> July 10,2000 y <br /> C Advanced Geo Environmental <br /> 4005 N.Wilson Way <br /> LStockton, CA 95205 <br /> Quality Control Report <br /> Matrix Duplicate <br /> Spike Spike <br /> Method Recovery Recovery RPD <br /> Blank % % % <br /> LMatrix: Soil <br /> QC Batch CWH28007 <br /> Benzene ND 106.5 109.7 2.9 <br /> Toluene ND 99.2 .105.6 6.3 <br /> -� Ethylbenzene ND 97.6 102.0 4.4 <br /> Xylenes ND 100.0 104.3 4.2 <br /> QC Batch MJS14/2038 <br />. Benzene ND 88.8 86.8 2.3 <br /> Toluene ND 87.6 86.4 1.4 <br /> Ethylbenzene ND 85.8 85.4 0.5 <br /> f m,p-Xylene ND 86.0 85.0 1.2 <br /> L Methyl-t-butyl ether ND 88.6 92.3 4.1 <br /> Diisopropyl ether ND 102.0 99.8 2.2 <br /> Ethyl-t-butyl ether ND 109.1 108.1 0.9 <br /> Tert-amyl mehtyl ether ND 124.8 125.3 0.4 <br /> Tert-Butanol ND 119.6 121.7 1.8 <br /> I <br /> L.� E <br /> ; This batch passes method quality control acceptance criteria. <br /> CND=none detected Bruce L.Gove,Laboratory Director <br />�r <br />