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Climax Molybdenum <br />A Freeport-McMoRan Company <br />March 31, 2011 <br />Mr. Tim Haynes <br />Climax Molybdenum Company, Henderson Mill <br />19302 Grand County Road 3 <br />Parshall, CO 80468 <br />Henderson Operations <br />PO Box 68 <br />Empire, CO 80438 <br />303-569-3221 Tel <br />303-569-2830 Fax <br />Re: Certification for Henderson Mill Process Water Supply Pipeline Replacement <br />Dear Tim: <br />The Henderson Mill replaced an approximate 1,600 lineal feet of the Mill Process Water Supply <br />Pipeline which transfers process water from East Branch Pump House to the Mill Process Water Supply <br />Tanks. The original 36 inch diameter ASTM-A 134 steel pipeline was replaced with a 36 inch diameter, <br />SDR 11 HDPE pipeline. Henderson engineering and sub-consultants completed the design and <br />installation of the pipeline. <br />The purpose of this letter is to state that the new pipeline was constructed in general conformance with <br />the design plans and specifications. Along with visual inspections, each HDPE joint was fused together <br />using a data logger to ensure the proper manufacturer fusion specifications were met. Since isolation of <br />the new line was impractical, an initial service leak test was performed per the Plastic Pipe Institute <br />(PPI) testing procedures. No leaks were found in any of the pipe joints or connection locations. There <br />were several modification made during the installation of the pipeline, however, these modifications did <br />not change the purpose or intent of the original design. Modifications made during installation are <br />reflected on the as-built drawings. <br />Sincerely, <br />Dillon Benbow <br />Sr. Mechanical/Civil Engineer <br />Henderson Operations