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• <br />• <br />Rule 2: Perrti(s <br />In order to reduce erosion and sedimentation during the life of the operation, disturbed areas will <br />be stabilized with an interim revegetation mixture during the first application season after <br />construction is complete. The interim revegetation mixture is shown in Table 2.05.44. It is <br />comprised of rapidly establishing, drought-[olerant grass species. Soil will not be applied to <br />temporarily revegetated areas. These areas will be seeded directly onto the existing substrate by <br />broadcast seeding. Interim revegetation will be conducted on topsoil stockpiles and portal spoil <br />piles. <br />TABLE 2.05.4-4 <br />LORENCITO CANYON MINE <br />INTERIM REVEGETATION SEED MIXTURE <br />~ecies Seeding Rate (PLS)' <br />Pounds/acre PLS/ft- <br />Grasses <br />Agropyron dasystachyum <br />Thickspike wheatgrass 5.0 I8 <br />Agropyron smithii <br />Western wheatgrass 5.0 l0 <br />Agropyron trachycaulum <br />Slender wheatgrass 3.0 ll <br />Lolium multiJlorumZ <br />Annual ryegrass ~Q ~Q <br />Total 18.0 61 <br />Rates given are for drill seeding; rates will be doubled for broadcast seeding. <br />Lolium mu[tiflorum can be replaced with sterile varieties of rye or oats. Costs for sterile varieties are <br />higher than annual plant costs, bu[ vary with availability and source. <br />CJ <br />Interim seeding accomplishes the stabilization of soils from wind and water erosion using annuals <br />and cool season plants to quickly revegetated and still provide some forage for wildlife and <br />livestock. Final reclamation with warm season and cool season plants, as well as shrubs for some <br />reclamation mixes, will occur upon completion of the operation. <br />Seeding rates have been designed to total approximately 70 to 80 pure live seeds (PLS) per square <br />foot for drill seeding for native communities; the broadcast rate will be roughly twice that of the <br />drill rate. This seeding rate will be used initially to evaluate germination success and the effects <br />of interspecific competition. Initial evaluation may favor a revised rate for subsequent <br />revegetation efforts. As new releases of commercial species are made, they will be considered for <br />inclusion in the revegetation mixes. Species evaluations will be made on reclaimed sites as part <br />of monitoring activities described in the following sections. Proposed modifications to seed <br />mixrures may be made for the following reasons: limited species availability, poor seed quality, <br />site difference, poor initial performance, or advances in reclamation technology. <br />PERMIT rev\April ll. 199'! 2.05-68 (revised 4/21/97) <br />