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<br />I <br />I <br />I <br />I <br />I <br /> <br />cement content, .both of which may yield an overall net reduction in the required cement <br />. <br />content and in cement-fly ash costs. <br /> <br />I <br /> <br />The normal thickness of the proposed surface material is controlled by the width <br /> <br /> <br />of soil cement step placement, which in turn is controlled by the constructability of the <br /> <br /> <br />soil cement steps. For a 9.0-foot wide step, the normal thickness is over 4.0 feet as <br /> <br /> <br />compared to the 0.5-foot to 1.5-foot thickness of the existing layered surface. The <br /> <br /> <br />multiple layers of the existing surfacing materials do not obtain the durability achievable <br /> <br /> <br />with a single solid surface. The minimum allowable soil cement thickness will be 2.7 <br /> <br /> <br />feet normal to the slope, <br /> <br />I <br />I <br /> <br />A significant design issue is the depth of the soil cement toe foundation. In the <br />current proposal, a toe depth of 4.0 feet has been selected. A final design issue will be <br />to optimize the foe depth. For every 1 .O-foot reduction in toe depth, an additional 400 <br />feet of upstream facing can be resurfaced. <br /> <br />I <br /> <br />I <br /> <br />The need for, and if necessary, the extent of the investigation program for <br />eyaluating the existence of and repair for voids under the existing concrete slabs will be <br />.' made during the final design process. <br /> <br />I <br /> <br />I <br /> <br />The new surfacing material will be subjected to continual and occasional <br />submersion, severe wave and freeze/thaw action, and ice loading and abrasion. These <br />actions are typically encountered on the upstream facing of a large water storage <br />reservoir in Colorado. These actions produce the damage and degradation of slope <br />protection materials. The proposed soil cement facing is a conventional use of the <br />material, and has shown excellent resistance to the elements and ice activities at Bonnie <br />Reservoir for nearly 50 years. <br /> <br />I <br /> <br />I <br />I <br /> <br />I <br />I <br />I <br />I <br /> <br />The existing concrete slabs on Jackson Lake Reservoir Dam have resisted the ice <br />'.' and wave loading for years but are now nearing their economic life, and the massive s6i1 <br />cement facing will better resist these damaging actions. <br /> <br />36 <br />