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-2- <br /> Metals Case Narrat ve <br /> RFW#: 9504S536 <br /> 11. All Duplicat analyses were within the 20% Relative Percent Difference (RPD) <br /> control limit; for sample values greater than 5X Reporting Limit, or +/- the <br /> Reporting Limits for sample values less than 5X Reporting Limit except for <br /> Chromium, Copper, and Nickel. The Relative Percent Difference on the raw data <br /> is calculated n the concentration amount between the two sample duplicates. The <br /> Relative Per ent Difference value on the report form is based on the percent <br /> recovery of the two sample duplicates. <br /> Peter Samna Date <br /> Metals Unit Leade <br />