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This Case Narrative applies to the data from the <br /> analysis (es) of Hexavalent Chromium - EPA Method 7196; Arsenic - <br /> EPA Method 7060; Copper - EPA Method 6010; Chromium +3 - By <br /> Calculation; and Total Chromium - EPA Method 6010 for Chemwest <br /> Case Number 8477 . <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 <br /> control 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 the possible errors introduced by the large <br /> dilutions required for the hexavalent chromium analysis. <br /> The analysis of nitrates will not be reported at this time <br /> due to delays caused by matrix problems and equipment failure. <br /> �p,�l���t1tiaCom_ �'FrL� 11cxeLa <br /> Verle Heyei � Date <br /> Inorganics Manager <br /> r <br /> CO--V> --HEN1 V.__ o<N DMSION <br />