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<br />Amec Foster Wheeler Environment & Infrastructure, Inc. <br />2000 S. Colorado Blvd., Suite 2-1000 <br />Denver, CO 80222 <br />Tel: (303) 935-6505 <br />Fax: (303) 935-6575 <br />amecfw.com <br />October 22, 2015 <br /> <br /> <br />Mr. Chris Hanks <br />Chief Environmental Coordinator <br />Cripple Creek & Victor Gold Mining Company <br />Post Office Box 191 <br />100 North 3rd Street <br />Victor, Colorado 80860 <br /> <br /> <br />RE: Method Specification on Slopes Steeper than 2.5H:1V <br /> <br />Dear Mr. Roberts, <br />Amec Foster Wheeler Environment & Infrastructure, Inc. (Amec Foster Wheeler) has prepared <br />this letter to correspond to Ames Construction, Inc. (Ames) submittal T0244-September 22, <br />2015 Meeting with CC&V and Enclosures Provided, proposing a method to achieve compaction <br />of fill using alternate equipment. <br />Compaction of fill on slopes in excess of 2.5H:1V has posed a safety hazard for site personnel <br />and Amec Foster Wheeler in conjunction with Ames have field tested and outlined a procedure <br />to achieve compaction on the steep slopes at the Cripple Creek & Victor Squaw Gulch Valley <br />Leach Facility. <br />Ames proposed to use an excavator-mounted slope packer (see attached). A field test was <br />conducted with the following procedure: <br />• A 3-foot-thick test pad of structural fill material was placed in one lift on flat ground <br />• A CAT smooth drum vibratory roller was used to compact a section of the test pad <br />(following the existing method specification of four passes) <br />• A CAT 330 excavator fitted with the slope packer was used to compact a different <br />section of the test pad with eight passes of the excavator mounted slope packer <br />• A nuclear density gauge was used to test the compaction of both sections of the test <br />pad. The table below summarizes the wet density compaction values for a side by side <br />comparison of the two methods <br />CAT Smooth Drum <br />Vibratory Roller <br />(4 passes) <br />(pcf) <br />CAT Excavator <br />Slope Packer <br />(8 passes) <br />(pcf) <br />123.3 128.5 <br />124.7 130.6 <br />125.0 127.9 <br />Average 124.3 Average 129.0