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SPECIFICATIONS T-OVERN • THE COfJSTRUCTIOf! OF A SEDIMEPJTATION POPJD Prepantlea of Fonadstloa for Dam-All vegetable matter of every description, including root to a depth of two feet, shall be removed from the entire area upon which the dam will rest, together with Doggy or unstable materials and deposited outside the toes of the dam. The banks of the stream channel shall be dressed to a slope o[ about 155:1. A bonding trench, with sloping sides and a bottom width of not less than 5 feet and depth of 4 feet, shall then be excavated beneath the center line o[ the dam the full length thereof, which trench shall be refilled with the most imper- vious material available. The foundation of the dam shall then be lightly plowed lengthwise of the dam, to provide proper contact between the foundation and the dam embankment. Plaelai of Dam EmDaakment-The materials shall be placed in the bonding trench and in the embankment of the dam in layers not exceeding 8 inches in thickness, after which each layer shall be thoroughly compacted by o heavily loaded dlc cultivator, a corrugated or sheep's foot roller, the treads o[ a caterpillar or trucks, or by livestock used in the construction. During the construction period, the top of the embankment shall be maintained as a horizontal plane the full width and length thereof, and no side dumping of materials shall be permitted. The materials shall at all Umes contain sufficient moisture to provide proper compaction. Puddling of material with water shall not be permitted. No frozen material or large clods or stones shell be incorporated in the dam. The upstream face of the dam shall be tonstructed with a slope not steeper than 255:1, and the downstream face on a slope not steeper then 2:1. The crest or top of the finished dam shall be not less than B feet in width. The upstream two-thirds of the dam shall be constructed of the most impervious materials, such es clay loam, or a mixture of clay end sand, end the downstream one-third of more pervious material, such as sand or gravel. The up- stream face of the dam shall be adequately protected against wave action by stone riprap, or other suitable materiel when required. Ontlet-Should the state engineer so require, there shall be located bznealh the dam an outlet pipe not less than 0 inches In diameter, equipped with a control valve attached to the upstream end of the pipe, together with suitable mechanism for operating the valve. Such outlet pipe shall be provided with cutoff cullers. The pipe shell be placed In e trench bottomed in stable formation, and shall be completely surrounded with well compacted impervious material. ~~~j ~~ C7 =_J® f'r1E;Y 21 190 - e ,.., - .r o.. t.. - ~ ~~ ~. , .~ ~_ U.. o o - t+-~-~ _ ~~ c., au r..,.. ~ :...J -> r.., MAXIMUM CROSS~SECTION OF DAM N!14)rn, ~_^.fdD R~CLPh':AT101~J C]lii. UC;`l. 01 ;V 31!lf3 HCSOI!fCOS Note: Pond embankment to be constructed in accordance with these plans and specifications, under the supervision of a registered professional engineer. Examined for structural weakness and erosion upon completion of ocnstruction and after each major storm event: Removed, regraded and renegotiated upon abandonment. Iiorrsw Plfa-Pits, from which materials are taken to build the dam, shall be cleared of all vegetable matter, and no material shall be borrowed within a distance of 50 feet o[ any part of the dam. Materiel excavated from the aplll- way, when suitable, may be used In building the dam.