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2. DRMS Comment <br /> The As-Built Drawings include the final 2019 surface elevations for the buttress material, <br /> however the drawings do not include details for the placement and as-built elevations for <br /> the filter material. Additionally, the as-built drawings eliminated many details for the 1.5 <br /> foot thick filter material and other construction details for the buttress project which were <br /> included on the original construction drawings. Please explain these discrepancies and <br /> revise the as-built drawings accordingly. <br /> Henderson Response <br /> Because the filter material is blanketed across the pre-construction topography, there is <br /> not a specific elevation that can be referenced. The filter material was placed in two 9-inch <br /> lifts prior to buttress construction. An additional as built drawing, sheet 2, was created to <br /> represent the filters extent and details added for the two 9-inch lifts. The channel and drain <br /> extensions from the 2018 work have also been included on sheet 7. Please see <br /> attachment 1 for the updated set of as-built drawings. <br /> If you have any additional questions, concerns or require more information regarding this project, <br /> please feel free to contact me at (720) 942-3480 or Miguel Hamarat at (720) 942-3255. <br /> Regards, <br /> Amber Parmet <br /> Senior Environmental Engineer <br /> Climax Molybdenum Company <br /> Henderson Operations <br /> Attachments: <br /> 1. Revised 3 Dam Phase I As-Built Drawings <br /> cc: M. Hamarat (CMC), email <br /> A. Hilshorst (CMC), email <br />