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<br />fe <br /> <br />'l'~ <br />I <br /> <br />fa <br /> <br />7.0 DESIGN RECOMMENDATIONS <br /> <br />Design recommendations for the Water Treatment P1ant Site, the Emergency <br /> <br /> <br />Storage Pond Site and the tributary watershed are summarized in this section. <br /> <br />7.1 Water Treatment Site <br />We recommend that Water Treatment Plant Site be fined to elevation <br />6600 at the west end of the site. The fin should extend at elevation 6600 <br />to the canyon wall on the south, if required. The fill may be graded at 10 <br />percent to meet the existing ground at the concrete ponds, as shown on Figure <br /> <br />3. <br /> <br />Due to the high velocity of 16 feet per second in the main channel, <br />s lope protect i on is requ i red to prevent eros i on. Riprap to res i st movement <br />by this velocity would require a median weight of about 2,000 pounds or a <br />median diameter of over 36 inches. It would aho require at least one and <br />possibly two intermediate filter blankets to prevent migration of fines from <br />the fill during high flows. This was considered to be uneconomical. 1\ ~1 <br /> <br />There is an existing stock pile of waste rock with diameters 1ess than <br />12 inches. This material would be suitable for slope protection, however it <br />would require additional protection to prevent movement by high velocity <br />flows. Welded Wire Fabric (WWF) laid over rock and fastened to anchors driven \Y~ <br />or p I aced in the subgrade has been used succes s ful1y. The fabric shou1 d be <br />heavy to resist the abrasive action of large material being moved by the <br />stream. Six-inch by six-inch mesh of 4 gauge wire is recommended. Anchors <br />may be any steel shape Or pipe. <br /> <br />7-1 <br />