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3 2 <br />The excavation for the foundation for the dam shall <br />be conducted so that when completed and terraced its <br />several planes shall have a slight downward slope toward <br />the lake area, being generally parallel and horizontal in <br />the direction of the axis of the dam. The terracing and <br />sloping of any solid rock will not be required, but it sL•all <br />be excavated, if necessary, to provide a rough bed upon <br />which the embankment will not tend to slide. The surface <br />of the earth foundation shall then be plowed with furrows - <br />parallel to the axis of the embankment and pulverized by <br />harrowing. It shall then be wet and allowed to stand until <br />in the proper condition for compacting. <br />Earth excavation for the dam foundation shall be paid <br />for at the price bid in the proposal and shall include all <br />material of whatever character, except hard, distinct, <br />solid rock as specified. <br />ROCK EXCAVATION: Rock, wherever used as a name for <br />excavated material, shall mean boulders exceeding 3/4 Cubic <br />yard in volume or solid ledge rock, which in the opinion <br />of the Engineer, requires for its removal drilling and <br />blasting, or wedging or sledginc and barring. There rock <br />excavation is necessary the contractor shall.excavate the <br />same as near the neat lines of the structure or on trench <br />as practicable and he shall take all due precautions in <br />the pursuance of the work. He will be held strictly <br />responsible for all injury to life and to public and <br />private property. No blasting shall be done until after <br />the stone is stripped of earth and the Engineer has <br />determined the elevation of. the rock surface. Measurement <br />of rock quantities will be made from the upper surface of <br />such rock found. No soft or disintegrated rock which can <br />be removed by a pick, boulders under three tatters cU is <br />yard in volume, nor rock outside the limits of measurement <br />specified which may have been previously loosened and from <br />any cause fallen within the lines of work, will be measured <br />or paid for under this classification. Care shall be taken <br />when blasting so as not to damage the rock foundation <br />itself. <br />EXCAVATION FOR SPILLWAY, Excavation for the spillway <br />shall be ma a to the lines indicated on the drawings. <br />Should the earth excavated for the spillway prove <br />to be 'unsuitable for use in the embankment, payment will <br />he :wade for this excavation at the price bid, otherwise <br />no payment will be made for this excavation, but the <br />suitable material will be paid for as embankment. <br />Rock excavation for the spillway will be paid for at . <br />the price bid. <br />EARTH EMAANXI%241:T: The material used in building the em- <br />bank ment sha l e the best obtainable from any point <br />within 1,500 feet of the axis of the dam.