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• APR 2 0 1!-)92 <br /> '�.N','IRONNIFNTA.L HEALTH <br /> This Case Narrative applies to the data from the analysis (es) <br /> of Hexavalent Chromium, Nitrate, Arsenic, Chromium, Copper, and <br /> Trivalent Chromium for ChemWest Case Number 9226. <br /> All Blanks contained no analytes at or above the reporting <br /> limit for each analyte. <br /> The percent recoveries from all initial and continuing <br /> calibration verification standards were within the required control <br /> limits. <br /> The percent recoveries for all laboratory quality control <br /> samples were within the posted control limits. <br /> Discrepancies between the Total and Hexavalent Chromium <br /> results may be due to error introduced by large dilutions necessary <br /> during the analysis of Hexavalent Chromium. Trivalent Chromium <br /> results will be subject to the same error since they are calculated <br /> from Total and Hexavalent Chromium concentrations. <br /> � t <br /> Al an W. Wo Da e <br /> Metals Supe or <br /> COMPUCHEM WESTERN DNISION <br />