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Page 7 <br />Colorado toestmoreland, Inc. <br />MLRD/OSM Joint Review <br />December 2, 1980 <br />A more detailed discussion of species and amounts per acre of seed<: and <br />seedlings is necessary. forthcoming baseline data will provir'e information <br />needed in the development of a more complete native plant species mix. To <br />ensure greater diversity in the mix, CWI may want to include a warm season <br />grass and some fore species. Pursuant to 4.25.2, CWI must indicate that their <br />choice of introduced species is compatible with other lo~_al Llant and animal <br />species and that their use is necessary to quickly establish a stabilizing <br />vegetative cover by presenting appropriate field study results and/or relevant <br />technical literature. CtJI state.sthat the seed mix used in previous revegetation <br />programs was approved by the Mined Land Reclamation Board of Colorado after <br />an extensive review of the revegetation problems specific to the Orchard Valley <br />Mine. This seed mix was approved under another set of regulations and does <br />not meet the requirements as set forth in 4.15. The seed mix should be <br />made up of predominantly native species and if wildlife habitat is the primary <br />or secondary Land us.', plan[ species and groupings must provide nutritional <br />value and cover for wildlife and support and/or enhance wildlife habitat. <br />Native shrub species and planting densities are mentioned, but it isn't <br />clear whether these are container grown plants, bareroot stock plants, or <br />wildlife seedlings. <br />A more detailed plan for the seeding and planting methods is necessary. <br />Nydtoseeding is good for steep terrain, but the soil texture is critical and <br />the soil cannot be compactc-d. Appendix R (VOi. III) states that topsoil will <br />be "fine graded"; a definition and implementation technique must be inclerded to <br />evaluate coml,atability with hydroseeding. Also, hydroseeding can require up <br />to twice the amount of seed required by drilling on south-facing steep slopes.' <br />The drilling reconvnendation for such a condition is 40-45 lbs/%.cre, so CWI <br />may want to increase C1re rate of seed application from 44 lbs/acre to near 80 <br />lbs/acre, depending on the steepness of the slope. No methods ate mentioned for <br />the transplanting of native shrubs. What is the actual planting process to be <br />used? It will differ among container-grown stock and bareroot stock. <br />The mulching techniques listed in 784.13(6)(1) have not been adequately <br />described. Bits and pieces can be obtained from Appendix U (VO1. III), but <br />more detail is necessary. Wood cellulose fiber should be applied at <br />approximately 1,500 lbs/acre, with greater amounts on very steep slopes. <br />Application of Patrosct SM at 1,000 Ibs/acre is adequate, but it must be <br />applied correctly For maximum effectiveness. CWI may want to consider adding <br />nitrogen to the mulch if tha carbon:nitrogen level of the wood fiber is high. <br />This will prevent the immobioization of nitrogen by soil microorganisms. <br />Asphalt emulsion is also mentioned in Appendix U (Vol. III), but types and <br />methods of application are lacking. The 1,500 gal/acre application rate is <br />adequate, but no mention is made of the curing rate (which can affect soil <br />stability), the possible effects on plants being used in the revegetation <br />program (certain plants can have a negative response) or the direction of <br />application (applying down slope leaves the side of soil clods free of asphalt <br />for seedling emergence). Excelsior m.~t ins Wllatinn was adequately described <br />in Appendix U (val. Ir7). A71 this information scattered through the text <br />and Appendix U (Vol. ICI) should be consolidated into t: his subsection in the new <br />text. <br />I ,~ i... I <br />