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a 2 <br /> T <br /> Alpha Analytical Laboratories Inc 860 Waugh Lane, H-1, Ukiah, California 95482 <br /> Order#A01012607 <br /> ,-mail clientservices@alpha-labs com Phone (707) 468-0401 Fax (707)468-,526Pag1 <br /> February 5, 2001 <br /> Advanced Geo Environmental <br /> 837 Shaw Rd <br /> Stockton, CA 95212 <br /> Quality Control Report <br /> Laboratory <br /> Laboratory Control Sample <br /> I Control Sample Duplicate <br /> Method Recovery Recovery RPD <br /> Blank % % % <br /> Matrix Aqueous <br /> QC Batch MDW2-192 <br /> l Benzene ND 90 9 88 9 23 <br />`` Toluene ND 876 863 1 6 <br /> Ethylbenzene ND 953 925 30 <br /> m,p-Xyiene ND 90 0 870 34 <br /> Methyl-t-butyl ether ND 83 8 835 03 <br /> Dusopropyl ether ND 1045 1026 1 8 <br /> Ethyl-t-butyl ether ND 1068 1064 03 <br /> Tert-amyl mehtyl ether ND 954 956 02 <br /> Tert-Butanol ND 706 785 105 <br /> This batch passes method quality control acceptance criteria <br />' ND=none detected Bruce L Gove, Laboratory Director <br />