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and 2.1.9 of Specification No. SP-L-PI-360 Rev. 3 indicate two different external coatings and AWWA <br />standards. Based on the March 22, 2011 CMC response, DRMS expects only paragraph 2.1.9 (35 mil <br />polyurethane coating per AWWA C222) to apply. If CMC intends to apply the fusion-bonded epoxy <br />external coating (18 mil coating per AWWA C213) elsewhere in the project, please ensure the <br />appropriate specifications are called out on the drawings as referenced in Comments 2a and 4a, above. <br />Response: Climax intends to only use the 35 mil polyurethane external coating for the reclaim pipeline. <br />Comment 7. Please provide hydraulic analyses indicating total dynamic head for steady state and <br />pump startup conditions for comparison with pipe specifications. <br />a. DRMS had expected a more detailed hydraulic analysis. In lieu of a detailed analysis, please assure <br />DRMS that the need for horizontal and vertical thrust blocks/restraints to prevent longitudinal pipe <br />separatiarrY(and subsequent-leakage)-has been considered and eliminated as-a necessary component of <br />the pipeline design. <br />Response: The entire length of the pipeline consists of carbon steel pipe with a full-circumference, full- <br />penetration weld at every joint. In addition, all field welds will be tested with nondestructive testing <br />methods prior to being backfilled. The strength of the welded joints is specified to be not less than that <br />of the adjoining pipes. As a result, all points along the pipeline, including bends, have sufficient strength <br />to withstand operating and surge pressures. The design indicates that thrust blocks along the pipeline <br />are not needed due to the restraint provided by the welded joints. The friction resistance between the <br />pipe and pipe bedding further reduces the thrust forces at bends. Although the analyses indicate that <br />thrust blocks are not required, Climax may consider installing thrust blocks at key locations as a added <br />safety measure depending upon field conditions encountered during construction. This determination <br />will be made by the project engineer (licensed P.E.). <br />Comment 8. Please provide pipe installation details indicating: <br />a. Where the different thicknesses of carbon steel pipe is used, <br />b. Where the HDPE pipe is used, and <br />c. How connections are made between different steel pipe thicknesses and HDPE. <br />a. DRMS received the requested details. <br />Response- Comment noted. - <br />Comment 9. What is the proposed reclamation for this pipeline? Removal and disposal, flush, grout <br />and abandon in place? <br />a. Climax stated that Robinson Lake will be reclaimed as afresh water reservoir and therefore Climax is <br />currently envisioning that the Robinson Reclaim Pipeline could have a post-mining use as a freshwater <br />conveyance to customers outside of the Eagle River Basin. If the pipeline should be abandoned, it would <br />be reclaimed by, rinsing, removing surface structures and plugging each subsurface end. DRMS finds <br />these proposed reclamation alternatives acceptable, but additional information may be required when <br />the decision is made what alternative will be put into place for final reclamation. Additional measures <br />may be required if the pipeline will be abandoned in place. <br />Response: Comment noted and Climax will confer with DRMS on the final closure design.