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HazeltinelRoad Runners Rest II/Brinkmann•Woodward Gravel Pits Lining Project -Design Technical Memorandum <br />Denver Water <br />August 2003 <br />Between about Stations 40+00 and 85+00, a slope height of 35 feet was modeled. <br />Generally where the interior slopes were flatter than 1.75H: ] V, sufficient crest width <br />was available, and stabilization fill will not be required to construct the cutoff wall. <br />Generally where the existing interior slopes were steeper than 1.75H: ] V, stabilization <br />fill will be required. Safe interior offset distance of 7 feet was used to select the <br />alignment based on a stabilization fill slope of 2.SH: I V. <br />• Between about Stations 85+00 and 106+00, a slope height of 55 feet was modeled. <br />Generally the interior slopes were flatter than 2H:1 V resulting in an interior offset <br />distance of 2 feet. Although the required offset distance from the crest was 2 feet, an <br />interior offset distance of 10 feet was selected to provide room for construction <br />equipment. <br />• Between about Stations 106+00 and 148+00, the alignment is located in unmined areas. <br />Although the required offset distance is about 1 foot, an interior offset distance of I S <br />feet was used to select the alignment to account for variations during the mining <br />operations. <br />• Between about Stations 85+00 and 148+00, a groundwater drain, will be installed to <br />manage groundwater mounding. The exterior limit of the safe zone was set at 15 feet <br />from the centerline of the groundwater drain. <br />The selected design crest width does not include the width of the working platform that maybe <br />needed by the Contractor for construction of the wall. We have assumed that the Contractor <br />will provide temporary berms in areas where a wider crest width is necessary to provide the <br />working platforms. Moreover, the horizontal alignment was selected in some areas (such as <br />Station 40+00 to Station 64+00) based on estimated topography of side slopes, because <br />continuing mining work had substantially altered the slopes in these areas. <br />GEl Consultants, Inc. 14 o;oso o?-o~?i ia-n~re~~-o~;,,, rM <br />