2018-07-02_PERMIT FILE - C2010089A (17)

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All vegetation material and topsoil will be removed from the embankment foundation during construction to increase stability and no vegetation material or topsoil will be placed beneath or in any access road embankment. Where an embankment is to be placed on side slopes steeper than 3h:Iv (33 percent), the existing ground will be plowed, stepped, or if in bedrock, keyed in a manner which increases the stability of the fill. The material for embankments will be free of organic material, coal or coal blossom, frozen materials, wet or peat material, natural soils containing organic matter, or any other material considered unsuitable by the Division for use in embankment construction. Material containing by volume less than 25 percent of rock larger than 6 inches in greatest dimension will be spread in successive uniform layers not exceeding 12 inches in thickness before compaction. Where the material for an embankment consists of large - size rock, broken stone, or fragmented material that makes placing in 12 -inch layers impossible under 4.03.2(3)(d)(iv), the embankment will be constructed in uniform layers not exceeding in thickness the approximate average size of the rock used, but the layers will not exceed 36 inches in thickness. Rock will be placed in a manner that will ensure proper placement in the embankment, so that voids, pockets, and bridging will be reduced to a minimum. The final layer of the embankment will meet the requirements of 4.03.2(3)(d)(iv). Each layer of the embankment will be completed, leveled, and compacted before the succeeding layer is placed. Embankment material will be leveled as placed and kept smooth. Compaction will be performed to the extent necessary to ensure stability. Material will be placed in an embankment under moisture content conditions which will permit compaction and ensure proper soil cohesion. Embankment slopes will not be steeper than 1.5h:1v, except that if the embankment material is a minimum of 85 percent rock, slopes will not be steeper than 1.35h:1v if it has been demonstrated to the Division that embankment stability will result. The minimum safety factor for embankments which exceed the slope gradients specified in (viii) above will be 1.3, or such higher factor as the Division may specify. Temporary erosion control measures will be implemented during embankment construction to control sedimentation and minimize erosion until permanent control measures can be established. Immediately upon completion, measures will be taken to stabilize all embankments with a vegetation cover or other means as approved by the Division to minimize erosion. Topsoil and other materials as determined under 4.06.2 will be removed from the design roadbed, shoulders, and surfaces where associated structures will be placed and will be stored in accordance with 4.06.3. Drainage: Each access road will be designed, constructed, and maintained to have adequate drainage, using structures, such as ditches and culverts. The water control system will be designed to safely pass peak runoff from a 10 -year, 24-hour precipitation event. Drainage from access roads that are not constructed within the disturbed area as described in 4.05.2(4), will meet the requirements of 4.03.2(4)(b) -(e) to minimize erosion, resultant siltation, and disturbance to the prevailing hydrological balance. Erosion control measures used alone or in combination include, but are not limited to: Stabilizing all exposed surface areas to promote a reduction in the Section 2.05.3(3) Page 10 March 2018 (TR -16)