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Width, from crest to crest shall be seventeen and one half feet (17.5'); <br /> Side slopes shall not be steeper than 2.0 H : 1 V. <br /> Upon completion of Ditch 8 excavation and liner installation, the dimensions of Ditch 8 <br /> shall be as follows: <br /> - The base of the ditch shall be five feet (5'); <br /> - Depth, from base to crest, shall be two feet (2.0'); <br /> - Width, from crest to crest shall be sixteen feet (16.0'); <br /> - Side slopes shall not be steeper than 2.0 H : 1 V. <br /> The base of the channel must be excavated so that the completed vertical dimension of <br /> two and eight tenths feet (2.8') is uniform across the base of the channel, as measured <br /> perpendicular to the direction of flow. High or low spots are not acceptable, and will <br /> require additional grading until the specified cross section is achieved. <br /> Excavated material shall be placed in the old Ditch 8, located immediately west of the new <br /> Ditch 8. Prior to placement of the excavated material into the old Ditch 8, logs and the <br /> underlying synthetic mat must be removed from the ditch. Logs will be saved and <br /> replaced east of the new channel when topsoil application and revegetation is completed. <br /> The old mat will be transported from the site and must be properly disposed of by <br /> CONTRACTOR. Excavated material placed in the old channel shall be compacted in <br /> place using tracked equipment. The material must be placed so that the old channel void <br /> is filled to at least one foot (1) over the adjacent ground surface elevation. If necessary, to <br /> achieve this minimum elevation, extra soil derived from the Sutey Topsoil Stockpile may <br /> be placed to increase the elevation as required. <br /> Upon completion of the Ditch 8 excavation, the base of the ditch shall be ripped to a depth <br /> of three to four inches (3" to 4"). Ripping shall occur perpendicular to the direction of flow. <br /> Ripping shall also occur immediately outside of the crest of the Ditch 8 to the crest of the <br /> old channel on the west side, and to the hillside on the east side. <br /> Upon acceptance of the ripping, topsoil shall be applied to the excavated Ditch 8. Topsoil <br /> will be removed from the Sutey Topsoil Stockpile at the location designated by PROJECT <br /> MANAGER. Topsoil from the Sutey Topsoil Stockpile shall be excavated in a manner so <br /> that the stockpile is left in a stable condition. All cut areas shall be excavated so that they <br /> do not exceed 3H : 1 V when excavation of topsoil is completed. <br /> Topsoil shall be applied to the base and sides of the excavated Ditch 8 to a uniform depth <br /> of three inches (3"). Topsoil shall also be applied to the areas ripped beyond the crest of <br /> the ditch on each side of the excavation. See Task 4, Adjacent Area Topsoil Application. <br /> Soil shall be placed to the specified depth and tracked into the ripped substrate using <br /> heavy equipment. Following tracking, the soil within Ditch 8 shall be hand raked to <br /> achieve a soil surface which is free of humps, dips, rocks or clods. The soil surface <br /> must be uniform, having no topographic variations, and it must be level from side to side <br /> as measured perpendicular to the direction of flow. <br /> Permamat 200F, or approved equivalent, shall be installed over the smooth soil surface. <br /> The mat shall be overlapped, staked, and anchored as specified by the manufacturer, <br /> except as modified below: <br /> 9 <br />