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<br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />CHAPTER III <br /> <br />DESIGNS AND ESTIMATES <br /> <br />Holes drilled longitudinally along the cutoff trench would be subjected <br />to pressure grouting to provide an impervious cap under the upstream por- <br />tion of the dam to seal all paths of seepage through the foundation. <br /> <br />Both pervious and impervious materials in sufficient quantity <br />for the dam embankment are available about 1.5 miles above the dam site <br />within the reservoir basin. Gravels suitable for processing as concrete <br />aggregates are available about 1.5 miles upstream and about 0.5 mile <br />downstream from the dam axis. Riprap could be obtained from breccia <br />near the dam site. <br /> <br />Reservoir construction would rp.quire the relocation of 2 miles <br />of Forest Service trail and 0.25 mile of fence and cattleguard. About <br />6.5 miles of Forest Service road would be improved to provide access to <br />the dam during construction. <br /> <br />Outlet Works <br /> <br />The outlet works toT Soap Park Dam would be a concrete-lined <br />tunnel about 1,700 feet long through the right dam abutment. The <br />upstream 800 feet of the tunnel would be a circular section 6 feet in <br />diameter and the remainder would be a horseshoe-shaped section 8.5 feet <br />in diameter. An intake structure would be connected to the tunnel by a <br />short vertical shaf'f; and elbow at a point 187 feet from the upstream end <br />of the tunnel. At the downstream end of the circular tunnel section an <br />emergency gate would be installed. At the gate reservoir releases to <br />Black Mesa Cbnduit would be directed into a steel pipe with an inside <br />diameter of 52 inches. This pipe would be housed within the first 740 <br />feet of the horseshoe tunnel and then would deflect to the right for <br />about another 300 feet, terminating at a control house where the releases <br />would be regulated by two high pressure gates. Releases to Soap Creek <br />would be made through a steel pipe with an inside diameter of 10 inches. <br />This pipe would extend through the horseshoe tunnel from the emergency <br />gate to the tunnel outlet. The outlet works would be designed to <br />release 275 second-feet to the Black Mesa Conduit at a reservoir water <br />surface elevation of 8,308.8 feet. <br /> <br />Prior to installation of the intake structure, steel pipe, and <br />control works, the outlet tunnel would be used to bypass flows of Soap <br />Creek arowd the dam site during placement of the dam embankment. The <br />diversion would be made through a channel excavated from the stream to <br />the upper end of the tunnel. When it is desirable to start storage, the <br />upper end of the tunnel would be sealed off from the reservoir basin by <br />means of a concrete plug" and the remainder of the outlet works would be <br />installed. <br /> <br />18 <br /> <br />