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• 2.0 REVEGETATION PRACTICES <br />2.7 SEEDBED PREPARATION <br />As a fast step in seedbed preparation, in areas where soil will be replaced, compacted surfaces will be <br />ripped to a depth of at least 12 inches before applying soil. In areas where soil is not available for <br />replacement or where surface materials are suitable, areas will not be ripped to a depth that exposes <br />any undesirable underlying materials. If this deprlr is less than six inches, then soil will be added to <br />attain a m+~imtun depth of six inches. In areas where broadcast seeding or hydromulching is to be <br />employed, the soil surfaces will be left somewhat rough. Dozers or other tracked equipment maybe <br />used to prepare the surface for hydromulching or broadcast seeding. If the seedbed surface is hard <br />and cnssty, then tracked equipment will be used to roughen the surface prior to hydro or broadcast <br />seeding. <br />2.2 SEED MIXTURE <br />The seed mixttues recommended for revegetation have some inherent flexibility built in and are <br />designed to restore disturbances in Juniper Woodland habitats of south-and southwest-facing slopes, <br />disturbances in the Mountain Shrubland habitat on somewhat more "mesic" east-facing slopes, and <br />riparian disturbance azeas. The species selected were developed to target the postmine land use of <br />quality habitat by adjusting the seeding rates and species components so that the species diversity will <br />be in line with the potential climax plant community for these sites. The present vegetation <br />cpmmm,mty on these sites represent a low range condition due to past over-grazing practices. The <br />shrub componenu of shah Juniper and Oak brush dominate these sites with an understory dominated <br />by Heanleaf Arnica, Qteatgrass, and Japanese Bromegrass. Therefore, OMI desires to replace the <br />vegetation community that approximates the climax potential for these sites. <br />The seed mix design and percent composition were derived by selecting the major species <br />componenu (dominance diversity found in the predominant range sites correlated with the <br />underlying soil communities. See Table 2. 11re reclantation area is predominantly underlain with soil <br />types of Tomorthents-rock outcrop (70%), Absazokee Beenom Soil Complex (30%). These soils are <br />correlated to the Rocky Loam and Brushy Loam range sites which have a climax plant community <br />that is dominated with grasses and asub-dominant shmb community. Due to the mixing of soik, <br />waste rock, and other materials that now constitute the available plant-growth medium, a selection of <br />vegetation species from the three soil types and their correlated range sites were selected as the <br />proposed rec]amation seed mix. (Table 3) Seeding rates are expressed in Pure Live Seed pounds and <br />aze specified at a rate of 40 live seeds per square foot, which is the reconunended seeding rate under <br />broadcast seeding methods. (Natural Resotuces Conservation Service specifications as per Wendell <br />Hassell NRCS-National Technical Advisor for Plant Materials, Denver Colorado September 23, <br />1996). <br />• <br />PR04 H 3 Revised May2001 <br />