Laserfiche WebLink
<br />comprised of rapidly establishing, drought-tolerant 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 />pies. <br />construction is complete. The interim revegetation mixture is shown in Table 2.05.4-4. It is <br />In order to reduce erosion and sedimentation during dte life of the operation, disturbed areas will <br />be stabilized with an interim revegetation mixture during the first application season after <br />TABLE 2.05.4-4 <br />LORENCITO CANYON MINE <br />INTERIM REVEGETATION SEED MIXTURE <br />Seeding Rate fPLSI' <br />Pounds/acre P~/f4Z <br /> <br />Grasses <br />Agropyron dasystachyum <br />Thickspike wheatgrass <br />Agropyron smithii <br />Western wheatgrass <br />Agropyron trachycaulunt <br />Slender wheatgrass <br />Lolium mulriJlorum2 <br />Annual ryegrass <br />TOTALS <br />5.0 18 <br />5.0 t0 <br />3.0 I I <br />~ l0 ~ ~~~ w <br />15.0 48 YO7tq <br />Rates given are'for drill seeding; rates will be doubled for broadcast seeding. <br />Lolium mulliJlorum can be replaced with sterile varieties of rye or oats. Costs for sterile varieties are <br />higher than annual plant costs, but vary with availability and source. <br />• <br />Interim seeding accomplishes [he stabilua[ion 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 slttubs 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 in[erspecific 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 />mixtures 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 />2.05-68 <br />(Revised 6/14/03) <br />