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• II West Coal Refuse Facility Structural Design and Analysis <br />Sedimentation Pond E Retaining Structure <br />• 6.0 STRUCTURAL DESIGN AND ANALYSIS <br />6.1 General <br />Based on the site conditions and storage requirements, a reinforced concrete wall was <br />selected for the retaining structure. Concrete retaining walls are widely used for these <br />types of facilities and provide/act as a spillway in the event of a storm event larger than <br />the design storm. <br />The concrete retaining wall will be constructed of reinforced concrete. The structure was <br />designed for the following loads: <br />Dead Loads: Concrete 1501bs/ft3 <br />Water 62.41bs/ft3 <br />Live Loads: Hydrostatic Pressure 62.4 ]bs/ft3 <br />Sediment Load 90 ]bs/ft3 <br />• The structural calculations for the retaining wall are contained in Appendix C. <br />• 6.2 Loading Conditions <br />The concrete retaining wall was designed for the following loading conditions. <br />End of Construction Loading Condition -Sediment pond empty with 4-foot of <br />sandy clay compacted against the downstream face of the wall above the footing <br />to elevation 6,020'+/-. <br />Extreme Storm Event with Erosion of Downstream Fill -Sediment pond with <br />water to elevation 6,031', no sediment load and no baclcfill placed against the <br />downstream face of the wall. <br />Maximum Sediment Loading with Extreme Storm Event and Erosion of <br />Downstream Fill -Sediment pond with sediment to elevation 6,027' and water to <br />elevation 6,031' with no bac)tfil] placed against the downstream face of the wall <br />6.3 Reinforced Concrete Design <br />The design of the reinforced concrete retaining wall was perfonned in accordance with <br />the ACI Building Code Requirements for Reinforced Concrete, ACI 318. The required <br />28-day compressive strength will be 4,000 psi for structural concrete. Reinforcing steel <br />• will be ASTM A615, Grade 60. <br />6 <br />