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la 2a <br /> ' Alpha Analytical Laboratories Inc. 860 Waugh Lane, H-1, Ukiah, California 95482 <br /> Order#A99110501 a-mail: clientservicesQalpha-labs.corn Phone: (707) 468-0401 Fax: (707) 46%6� 71 <br /> ' November 15,1999 <br /> Advanced Geo Enviromental <br /> ' 4005 N.Wilson Way <br /> Stockton, Ca 95205 <br /> ' Quality Control Report <br /> Matrix Duplicate <br /> Spike Spike <br /> ' Method Recovery Recovery RPD <br /> Matrix: Aqueous Blank % % % <br /> ' QC Batch MJS13/1908 <br /> Benzene NO 99.6 102.2 2.5 <br /> Toluene ND 103.0 100.7 2.2 <br /> '0 <br /> Ethylbenzene NO 108.4 104.8 3.5 <br /> m,p-Xylene NO 100.7 98.5 2.2 <br /> ' Methyl-t-butyl ether NO 100.2 106.5 6.1 <br /> Diisopropyl ether NO 77.9 82.2 5.4 <br /> Ethyl-t-butyl ether NO 75.6 80.2 5.9 <br /> Ter't-amyl mehtyl ether NO 88.7 94.1 5.9 <br /> Tert-Butanol ND 97.4 98.8 1.5 <br /> 1 <br /> This batch passes method quality control acceptance criteria. <br /> ' ' ND=none detected Bruce L.Gove, Laboratory Director <br />