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r <br /> <br /> <br />Mr. Gilbert Rindahl -3- September 30, 1983 <br />The staff recommends that the segregated topsoil from the Niwot <br />series and portions of the colluvial land nut be mixed with subsoil. ff <br />the operator wishes to screen the topsoil just prior to placement, he <br />may do so. The overburden subsoil must be stockpiled separately, <br />screened separately and replaced prior to topsoil replacement. In order <br />to achieve the proposed final land use, the staff recommends that a <br />minimum of 12 inches of "growth medium" be replaced evenly over all <br />disturbed areas. <br />3. The proposed seed mix containiny Smooth Brume, Orchardgrass and <br />Intermediate wheatgrass is acceptable for areas 'the operator wishes to <br />return to hay meadow. However, this mix would not provide proper plant <br />diversity or species for the upland disturbance areas and other areas <br />not to be hay meadow. The staff suggests that 'the operator propose <br />another seed mix for areas outside of the hay meadow. <br />the following species should do well on 'the upland areas: <br />Western wheatyrass <br />Little hluestem <br />Rig bluestem <br />Sldeoats grams <br />Blue grams <br />Green need legrass <br />Rubber rabbitbrush <br />Mountain mahogany <br />the operator should work up an <br />50 pure live seeds per square foot. <br />upland grass and shrub mix figured at <br />4. The operator has agreed to randomly plant Cottonwood, American plum, <br />Golden current, Chokecherry and Mountain mahogany seedlings adjacent to <br />the St. Vrain Creek for wildlife. However, I see no mention of 'this in <br />the revised plan. the staff recommends that this planned planting not <br />be deleted at this stage in the mining operation. <br />.~ , ~~~ <br />~/~J.,/; <br />h ,; r <br />J' <br />5. The operator states that seeded areas will be irrigated for at least <br />the first complete growing season and, if needed, two years after <br />planting. Is it correct 'to assume that the operator is referring to all <br />areas, or just the hay meadow? What is the status of 'the irrigation <br />water the operator proposes to use? <br />6. Please state what slopes will be provided around the sediment ponds. <br />7. Vlease describe where the operator wishes to maintain the riprap <br />along the hanks of the St. Vrain Creek. Is it necessary to leave all of <br />the riprap, as is, to achieve 'the desired objective of land protection, <br />