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Desian <br /> The constructed diversion must adhere precisely to the design parameters as depicted in these <br /> specifications and on the attached maps and cross sections. The cross section locations will be <br /> staked in the field by PROJECT MANAGER prior to construction for reference purposes. <br /> Measurement along the approximate centerline of the inner channel (Map 3, Dutch Creek <br /> Diversion Design) indicates that the diversion will be approximately one thousand two hundred <br /> sixty feet (1,260') in length. The overall gradient, or fall, of the diversion will be 6.8%. <br /> Upon completion, the inner channel will vary in width at its crest from fourteen feet (14') to twenty <br /> two feet (22'), with an average width of seventeen feet (17'). The depth of the inner channel will <br /> be two feet (2'). Side slopes will be constructed as depicted on the cross sections. The inner <br /> channel must be over excavated so that a minimum of two feet (2') of rock may be placed <br /> immediately beneath and adjacent to the sides of the channel. <br /> Upon completion the outer channel will vary between thirty and sixty feet (30' - 60') in width, <br /> dependent upon location, with an average width of forty four feet (44'). The banks will vary <br /> between five and thirty feet (5' - 30') in height, dependent upon location. Side slopes will be <br /> constructed as depicted on the cross sections. The outer channel must be over excavated so <br /> that a minimum of one foot (1') of rock materials may be placed under the base of the channel <br /> outside of the inner channel. <br /> Rock materials to be used to fill over excavated areas will be derived from excavation of the <br /> diversion, and from the rock source area identified on Map 6, Potential Construction Sequence. <br /> Rock materials to be salvaged and /or excavated for use will vary in size between cobbles and <br /> boulders up to five feet (6) as measured along the longest axis. During filling of the over <br /> excavated areas with rock materials, care must be exercised so that excessive rock is not <br /> introduced into the diversion. The dimensions depicted on the cross sections must be achieved <br /> upon completion of construction operations. <br /> The east side of the southern most one hundred twenty feet (120') of the diversion must be <br /> heavily armored by combining larger boulders with less coarse rock particles. This armoring will <br /> need to be accomplished within both the inner and outer channels. Armoring of this area shall <br /> achieve a minimum thickness of four feet (4') along the outer channel wall, and three feet (3') on <br /> the inner channel wall and on the flat area which is formed between the top of the inner channel <br /> and the base of the outer channel (see Typical Channel Cross Section, Map 3, Dutch Creek <br /> Diversion Design). <br /> Map 3, Dutch Creek Diversion Design; Map 4, Dutch Creek Diversion Cross Section Locations; <br /> Cross Sections 1 through 23 depict the construction specifications. <br /> Special Requirements <br /> Throughout construction of the diversion, access to the upper portions of the Coal Basin Mines, <br /> via the adjacent Road A, must be maintained. A minimum passable width of twenty two feet <br /> (22') of Road A must be maintained at all times. <br /> Dutch Creek must not be diverted into the diversion until construction is complete, and is <br /> certified as such by the PROJECT MANAGER. <br /> 8 <br />