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aspen wood, and bonded by a ultra violet stabilized mesh. Permamat 200F or approved <br /> equivalent is required. <br /> After initial excavation of the channel, soil shall be placed at to the specified depth, and raked as <br /> necessary to achieve the required degree of uniformity. The lower liner shall then be installed <br /> over the smooth soil surface. CONTRACTOR shall install Permamat 200F soil stabilization mat, <br /> or approved equivalent, in the channel, per manufacturers specifications, except that check slots <br /> shall be required at be installed at thirty feet (30') intervals, rather than at the manufacturer <br /> specified spacing of fifty feet (50'). Overlap of adjacent mats shall be six inches (6") rather than <br /> three inches (3"). <br /> After installation of the lower liner, an additional two inches (2") of soil shall be placed over the <br /> top of the lower liner. Rocks, clods, dips and sharp bumps will be removed from the soil surface <br /> to ensure a positive contact between the soil cover and the overlying blanket. Raking of the soil <br /> surface may be required in order to achieve the desired degree of uniformity. The seed and <br /> fertilizer may not be applied until a uniform surface has been achieved. <br /> Upon completion of topsoiling, diammonium phosphate fertilizer(18-46-0) shall be applied at a <br /> rate of 300 pounds per acre. Seed, to be provided by PROJECT MANAGER, will be broadcast <br /> applied at the rate of ten pounds (10#) per acre. <br /> After seeding and fertilization is complete, a soil stabilization mat, or upper liner, shall be <br /> installed. Permamat 200f is supplied with an upper liner. If a different liner system is proposed <br /> for use, the upper liner must be equivalent to a temporary stabilization blanket such as Xcel <br /> Excelsior Blanket- Superior. <br /> Upon completion of all other Tasks associated with this Project, the old Ditch 8 will be backfilled <br /> using the material excavated from the newly constructed ditch 8. The material will be placed <br /> within the confines of the newly constructed channel, and compacted in place using a heavy <br /> dozer. The ground surface elevation of the filled old ditch must exceed the elevation of the top of <br /> the western side of the new ditch 8 by at least one foot (1'). It may be necessary for <br /> CONTRACTOR to import sufficient excess material in order to accomplish this elevation <br /> difference. <br /> When the old Ditch 8 is completely backfilled, the small drainage ditches which traverse the <br /> south facing side of the Sutey Pile will be extended across the backfill at their current grade, and <br /> tied into the newly constructed Ditch 8. These ditches shall be inclined into the hillside at a <br /> twenty five percent 25% angle. <br /> Old Coal Storage Area <br /> A drainage ditch will be constructed from the southern portion of the Old Coal Storage area, <br /> south across Road A and down the inside portion of the road to the pond located outside of the <br /> first Road A switchback. <br /> The ditch will be triangular in shape. The ditch will have a minimum depth of eighteen inches <br /> (18") at its center. Side slopes will be no steeper than 3H:1 V. The ditch will have a gradient of <br /> no steeper than four percent (4%), except where it is located adjacent to Road A below the low <br /> water crossing, where its gradient will match that of Road A. <br /> A low water crossing will be constructed at the Road A crossing of this ditch in order that <br /> 16 <br />