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This Case Narrative applies to the data from the analysis (es) <br /> of Arsenic EPA Method 7060, Hexavalent Chromium EPA Method 7196, <br /> Nitrate - N EPA Method 300 . 0, Trivalent Chromium by calculation, <br /> Copper and Chromium EPA Method 6010 for ChemWest Case Number 8888 . <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 /> Due to the complex matrix of the sample there were excessive <br /> dilutions required to obtain results within the linear range of the <br /> method for Hexavalent Chromium. Any small error introduced by the <br /> dilutions may have lead to large discrepancies in the final results <br /> between the Total Chromiums and the Hexavalent Chromiums. <br /> Verle HeyeI7 Date <br /> Inorganics Manager <br /> COMPUCHEM WESTERN DMSION <br />