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<br />W=Q/C,„H'" <br />= 12 feet <br />~illway Construction <br /> <br />The spillway will be constructed near the southwest corner of the stonnwater retention <br />pond as shown in Figure i. The spillway will be approximately 12 feet wide at the base <br />(at an elevation 6,611.5 feet) and will have 2:1 side slopes. The total length will be <br />approximately 70 feet. It will be lined with 60 mil HDPE liner installed on 6 inches of <br />compacted liner bedding. At the downstream edge of the spillway, there will be <br />approximately 10 feet of riprap installed on geotextile fabric. The riprap will be <br />approximately 18 inches thick. Details of the spillway are shown in Figure 2. <br />The riprap material will consist of hard, dense, durable stone, angular in shape and <br />resistant to weathering. Rounded stone or boulders will not be used. The stone will <br />have a specific gravity of at least 2.5. The greatest dimension of each piece will be less <br />than three times its least dimension. Nominal stone size will be 6 inches. Kvaerner, GC- <br />Ol Specification, Site Work, includes the riprap requirements. <br />2 <br />Summary o(Kvaemer Calculations <br />Stormwater Retention Pond Spillway <br />Techuol Revision Miiung and Reclamation Pemtit <br />