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<br /> <br />• <br />EHBANRY.ENT POND SPECIFICATIONS <br />Foundation preparation <br />The entire foundation area shall be <br />cleared of trees, logs, stumps, <br />roots, brush, boulders, sod, and <br />rubbish. For fSsh ponds, ell trees, <br />brush, peat, and debris below the <br />highvater line shall be removed be- <br />fore construction is completed, and <br />all trees and brush on chore within <br />30 feet of highwater line shall be <br />removed. <br />If needed to establish vegetation, <br />the topsoil and sod shall be stock- <br />pSled and spread on the completed dam <br />and splllvays. .. <br />Foundation surfaces shall be sloped <br />no steeper than 1:1. Existing stream <br />channels Sn the foundatlon area shall <br />be sloped no steeper than 1 1/2:1 and <br />deepened and widened as necessary to <br />reaove all stones, gravel, sand, <br />stumps, roots, and other ob~ection- <br />able material and to accomodate com- <br />paction equipment. <br />The cutoff trench and any other re- <br />quired excavations shall be dug to <br />the lines and grades shove on the <br />plans or as staked in the field. (A <br />minimum cutoff trench having a bottom <br />width of not less than five (5) feet <br />and a depth of four (4) feet is re- <br />quired for all dams.) If they are <br />suitable, excavated raterials shall <br />be used in the permanent fill. <br />The foundation area shall be thor- <br />oughly scarified before placement of <br />the fill material. I'he surface shall <br />have molsture added or it shall be <br />compacted if necessary so that the <br />flrat layer of fill material can be <br />compacted and bonded to the founda- <br />tion. <br />Foundation areas shall be kept free <br />of standing eater when fill is. being <br />placed on them. <br />378-11 Pond <br />Fill placement <br />The material placed in the fill shall <br />be free of sod, roots, frozen soil, <br />stones more than 6 inches in diameter <br />(except for rock fills), and other <br />objectionable material. Stones 6 <br />inches in diameter to 12 inches in <br />diameter may be used in the downstream <br />one-third of the embankment. Stones <br />larger than 12 inches in diameter <br />shall be wasted on the downstream <br />slope surface or disposed of away from <br />the site. <br />The placing and spreading of fill <br />material shall be started at the low- <br />est point of the foundation and the <br />fill brought up in horizontal layers <br />not exceeding six (8) inches after <br />which each layer shall be thoroughly <br />compacted. The fill shall be con- <br />structed is continuous horizontal <br />layers except where openings or sec- <br />tionalized fills are required. In <br />those cases, the slope of the bonding <br />surfaces between the embankment in <br />place and the embankment to be placed <br />shall not be steeper than 3 horizontal <br />to 1 vertical. The bonding surface <br />shall be treated the same as that <br />specified for the foundation so as to <br />insure a good bond with the new fill. <br />During the construction period, the <br />top of the embankment shall be main- <br />tained as a horizontal plane the full <br />length and width thereof, and no side <br />dumping of materials shall be. permit- <br />ted. <br />The distribution and gradation of <br />materials shall be of such that no <br />lenses, pockets, streaks, or layers of <br />material differ substantially in tex- <br />ture or gradation from the surrounding <br />material. If S[ is necessary to use <br />materials of varying texture and grad- <br />ation, the more impervious material <br />shall be placed in the center and <br />SCS, Colorado, April 1960 <br />