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<br />. <br /> <br />specifications stated only that "all vegetable matter of every <br />description and all roots and stumps must be removed from the site." <br />The rock-fill section consists of material excavated from the <br />spillway channel and a nearby quarry. The rock was dumped in place. <br />The downstream face consists of hand placed rock. <br />The construction specifications provided that "... in the construc- <br />tion of the earth section of the embankment, any earth found in the <br />immediate vicinity of the damsite ...that is entirely free of vegetable <br />material, and containing not too large a proportion of sand or loose <br />rock, will be accepted." The volume of loose rock was not to exceed <br />25 percent. Material for the earth-fill was deposited through the <br />"bas i n and embankment" method. Para 11 e 1 embankments spaced approx i- <br />mately 50 feet apart were placed in three two-foot layers compacted <br />by mule teams. The top width of the embankment was reportedly about <br />15 or 20 feet. After the basins between banks were partially filled <br />with water, material was dumped along the edges of the embankments and <br />plowed into the water to form puddles. When the trenches were filled <br />with earth, new embankments were constructed above the preceding <br />puddle trenches and the procedure was repeated. <br />The outlet works tunnel has a design width of 15 feet and height <br />of 15 feet. The tunnel is unlined except at the gate chamber, located <br />under the dam centerline. The tunnel is about 620 feet long and <br />reportedly has a grade of 0.25 percent. The intake cage reportedly <br />consists of 3-inch by 2t-inch angles with 3-inch openings. The cage <br />is reportedly 22 feet wide and 20 feet high. Five 3-foot by 8-foot <br />tandem sluice gates were installed in the gate chamber. The gate <br />stems pass to the dam crest through an 8-foot by 20-foot vertical <br />shaft blasted through the rock overlying the outlet works tunnel. <br />It is reported that unacceptable vibrations occurred at the out- <br />let works gate structure during maximum releases. Either immediately <br />after construction or shortly thereafter, two of the center gates were <br />permanently blocked with concrete. The original discharge capacity~ ~ <br />was thus reduced to the present 2,500 cfs maximum capacity. ~ <br /> <br />. <br /> <br />. <br /> <br />-39- <br />