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2.5.5 Grading, Backfilling and Ripping <br /> Grading and backfilling will begin once mill structures are removed. Bulldozers and loaders will <br /> be used to grade and re-contour areas to blend with surrounding undisturbed topography. <br /> Backfilling may be necessary in the building footprints and in drainage areas. As areas are <br /> graded and backfilled,final grading will leave areas in a roughened state to enhance surface <br /> water penetration between replaced topsoil and subgrade, promoting vegetation growth. <br /> Sediment ponds and drainage structures not necessary during post closure FTSF monitoring will <br /> be backfilled, graded and blended with surrounding topography. The contact water pond and <br /> contact water discharge channel will remain until the FTSF cap is approved by the Divisions. <br /> The majority of the interior roads will not be reclaimed. The existing access road from CR 3A to <br /> the mill site will not be reclaimed as it will be the post-closure property access road. The road <br /> leading to the mill building from the main interior road and the interior road from the mill <br /> building to the FTSF will be reclaimed, approximately 300 linear feet, or 6000 ft2. This road and <br /> areas that have been compacted by buildings will be ripped and roughened using a bulldozer <br /> equipped with a ripper. Ripped surfaces will be graded to blend with adjoining topography. <br /> 2.5.6 Growth Medium Replacement <br /> During reclamation, approximately four inches of growth medium material will be placed on <br /> graded surface disturbances using bulldozers, loaders or motor grader. <br /> 2.5.7 Revegetation <br /> Prepared disturbances will be seeded with a USDA NRCS recommended seed mix developed for <br /> this specific site. The seed mixture is predominately native species that will establish in the <br /> semi-arid non-irrigated location. Re-vegetation will occur either during early spring or late fall. <br /> The prepared surfaces will be drill seeded using the NRCS recommended seed mix provided in <br /> Table 10.2.5. The site will be mulched with straw at the rate of 4000 lbs./acre and then crimped <br /> using a bulldozer. <br /> Table 2.5.6-1: Reclamation Seed Mix <br /> Plant Species Seeding Rate(PLS/acre) <br /> Blue grama 0.25 <br /> Indian ricegrass 0.74 <br /> Sand dropseed 0.05 <br /> Little bluestem 1.34 <br /> Sideoats grama 1.82 <br /> Bottlebrush squirreltail 0.45 <br /> Needleandthread 0.54 <br /> Blue flax 0.57 <br /> Annual sunflower 3.71 <br /> 2.5.8 Reclamation of the FTSF <br /> A vegetative cover system will be constructed over the FTSF. A closure channel will be constructed <br /> around the perimeter of the reclaimed FTSF to capture surface water runoff and prevent surface <br /> water runoff flow onto the reclaimed FTFS. The final surface of the FTSF will be graded to promote <br /> 32 <br />