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la 2 <br /> Alpha Analytical Laboratories Inc. 860 Waugh Lane, H-1, Ukiah, California 95482 <br /> Order#A99121401 e-mail: clientservices@alpha-labs.com Phone: (707)468-0401 Fax: (707) 468-Page 1 <br /> ' December 27, 1999 <br /> Advanced Geo <br /> 4005 N. Wilson Way <br /> Stockton, CA 95205 <br /> Attn: Tony Mikacich <br /> Quality Control Report <br /> Matrix Duplicate <br /> Spike Spike <br /> Method Recovery Recovery RPD <br /> Blank % % % <br /> Matrix: Soil <br /> QC Batch: CWH 25138 <br /> Benzene ND 103.0 92.8 8.0 <br /> Toluene ND 104.0 94.1 6.7 <br /> Ethylbenzene ND 103.0 94.2 6.7 <br /> Xylenes ND 108.0 95.8 7.5 <br /> Methyl-t-butyl ether ND 88.7 81.9 4.7 <br /> QC Batch: MJS 1311927 <br /> Methyl-t-butyl ether ND 93.1 96.8 3.9 <br />' Diisopropyl ether ND 95.0 96.0 1.0 <br /> Ethyl-t-butyl ether ND 86.7 89.5 3.2 <br /> Tert-amyl mehtyl ether ND 90.0 93.5 3.8 <br /> Tert-Butanol ND 101.7 116.4 13.5 <br /> 1,2-Dichloroethane ND 99.8 99.9 0.1 <br /> This batch passes method quality control acceptance criteria. <br /> ND= none detected Bruce L.Gove, Laboratory Director <br />