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• <br />- 10 - <br />State of Colorado 5ighway Snecificatiors for this t}fie naterial. It is <br />anticipated that the entire docrostream toe of the enbanFa!ent will be <br />constructed of this tyre mat_ria1. <br />EPi9At1K.EIPI' uESIGI - SEDIt:CIrI'A1T_Cf; F'Jl1D~ 2~, 3 n D 4 <br />Proposed Construction: Ponds 3 and 4 are ,;enerslly locetod a~ithin the <br />upper catchr..ent tributary areas to Cry Crook as discussed in our <br />previous report. Fond 2A is locat•.d .vithin a shallo.+ tributary ravine <br />to Darden Gulch near the southeast xrtion of the croal lease. Due to <br />the si.,,ilarity of subsoil conditions, 3eolo7Y and erLbanknent sections <br />between these sites, an crx7ineorina analysis was ^zrfor;~d cn Fond 4 <br />and the results ao_vlied to the other enban„nr,ent structur^s. <br />• Typical elan sections and centerline rrofiles showing the <br />relationship between the proposed embanJc~ent, existin3 topa3raphy and <br />subsoil conditicns are shosm on Figs. 4 throu~~h 0. Csscntially <br />rudified ha-ageneous er.:banknents are pror~osed. The ,nazi^,~m crest <br />heights and iricoundr.',ents will bo ancror.i~ately 2~ feet, 22 feet and <br />35 feet and 10.6 acre feet, 5.3 acre feet and 2C.9 acre Eeet•for <br />Ponds 2A, 3 and 4, respectively. Upstrea.~n slopes of 3:1 e:-x'. daanstrea~ <br />slopes of 2.5:1 are proposed. Reduced downslope sections for all three <br />emban'rnents are desirable. ~cey trenches •.vi11 be excavated into <br />bedrock. Each e.^:ban.~anent will also be rouinped with 1R-inch C?]P outlet <br />works and an erer7ency spillway. Elevation of tt~e inlet ~i~ was taken <br />1 foot above the allowable sedi;nent level. Spillways will be <br />. trapezoidal channels located within the anbaniment section and f_~e <br />protected against erosion by slope mttresses and/or riprap :material. <br /> <br />