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J . 35 <br />s-s <br />structure complete as shown, ready to operate. Should it <br />be necessary to extend the structure to a greater depth than <br />shown, extra compensation will be allowed at the price bid <br />for extra concrete.- <br />PIPE LINES: The work under "Pipe Lines" shall include the <br />48`concrete pressure pipe, with collars, and the drain <br />lines indicated or required. <br />The.48" concrete pressure pipe shall be placed in <br />the original earth and not in the embankment. L•'xcavation <br />for the pipe shall be made in the original foundation <br />material, and the pipe trench made no larger than the <br />smallest area needed to.handle the pipe and joints. <br />Concrete cut-off walls or collars shall be constructed at <br />the intervals shown. In the area outside the pipe trench, <br />the concrete collars shall be placed against the earth as <br />excavated, except above the top of the pipe trench, where <br />forms must be used. After the forms have been removed <br />the trench shall be carefully backfilled, the earth de- <br />posited in 3" or 4" layers rammed thoroughly with power <br />tamps, each layer being sufficiently moist to insure a <br />bond between layers. <br />The joints in the concrete pressure pipe shall be <br />water tight and the whole operation, including backfilling <br />and concrete collars, shall be completed in such a manner <br />that water from the reservoir cannot follow along the <br />smooth surface of the pipe. <br />Payment for the 48" concrete pressure pipe shall be <br />made at the unit price bid in the proposal, and it shall <br />include the pipe in place with concrete collars. <br />In order to prevent saturation of the downstream <br />portion of the dam, the natural seepage line shall be <br />lowered by installing pipe and stone drains, as shown. <br />These drains shall consist of 8" 16 gage corrugated metal <br />pipes, fully bituminous coated and perforated, as shown <br />in detailed drawings. A filter consisting gravel or <br />crushed stone, 1008 passing a 3/8 inch sieve, with 708 <br />retained on No. 10 sieve and 08 passing a No. 40 sieve, <br />shall be placed around the drain pipes as shown. <br />A main drain shall be installed parallel to the <br />axis of the dam at the downstream edge of the impervious <br />core, with laterals placed at the intervals shown. <br />These drains, including pipe and stone, shall be <br />paid for at the unit price bid in the proposal. <br />Any spring or springs that may develop on the site <br />of the dam shall be traced to a point where it becomes <br />feasible to seal off and the discharge combined into a <br />I <br />