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la 2 <br /> I Alpha Analytical Laboratories Inc 860 Waugh Lane, H-1, Ukiah, California 95482 <br /> order#A00040611 a-mail clientservices®alpha-labs com Phone (707) 468-0401 Fax (707) 468-04Z1 <br /> April 17, 2000 <br /> Advanced Geo Enivironmental <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 /> Blank % % % <br /> Matrix Aqueous <br />' QC Batch MJS13/1980 <br /> Benzene ND 1010 996 1 4 <br />' Toluene ND 964 916 51 <br /> Ethylbenzene ND 89 0 903 14 <br /> m,p-Xylene ND 95 3 89 8 60 <br />' Methyl-t-butyl ether ND 96 3 970 07 <br /> Dusopropyl ether ND 933 920 1 3 <br />' Ethyl-t-butyl ether ND 872 874 02 <br /> Tert-amyl mehtyl ether ND 871 89 3 25 <br /> Tert-Butanol ND 1077 1173 85 <br />' 1,2-Dichloroethane ND 1000 99 7 02 <br /> 1,2-Dlbromoethane ND 959 930 30 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> This batch passes method quality control acceptance criteria <br /> ND=none detected Bruce L. Gove laboratory Director <br />