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REQUEST FOR TECHNICAL REVISION Mine ID# M-1993-035 <br /> Mine Name: Swan River Resource Location: Summit County <br /> Upland Restoration <br /> Reach B restoration contains approximately 10-acres of upland area that will be reclaimed. These areas will <br /> consist of dredge material graded to varying and undulating landforms based on material quantities. Generally, <br /> upland areas will be graded to form naturally appearing varying landforms with stable slopes and covered by a <br /> minimum of six inches of unconsolidated soil growth media. This growth medium will consist of fine-grained <br /> mineral soils (salvaged from the site) amended with imported organic soils,wood chips, biosolids, manufactured <br /> fertilizers, humates and mycorrhizal inoculations.All grading will create a smooth transition into both the <br /> riparian corridor and the existing natural uplands. Upland areas will be re-vegetated with an appropriate native <br /> mountain big sagebrush community including species such as big sagebrush (Artemisia tridentate), rabbitbrush <br /> (Chtysothamnus sp.) and buffaloberry(Shepherdia canadensis). Understory vegetation will include Rocky Mountain <br /> fescue (Festuca saximontana), Indian ricegrass (Oryzopsis hymenoides), mountain brome (Bromus marginatus), <br /> western wheatgrass (Pascopyrum smithii) or Canada wildrye (Elymus Canadensis). Wetland <br /> Features <br /> Within the overall Project Site, several potential locations for wetland development have been identified <br /> alongside the proposed channel alignment. These locations are in close proximity to groundwater, adjacent to <br /> the proposed stream channel alignment, and integrate well with the surrounding final landscape. In consideration <br /> of the overall Reach B restoration reclamation, it is anticipated that approximately two (2) acres of wetland <br /> habitat will be created.The intent is the wetland areas would interact both with local groundwater and be fed <br /> from surface water at times of higher flows.A low permeability soil material would be placed below the wetland <br /> to minimize vertical water loss in locations where the groundwater level is lowest.Wetland would be seeded <br /> and plugged. Available willows impacted during excavation can be transplanted in the wetlands where feasible. <br /> The following table provides a summary of the proposed restoration reclamation components within Reach B. <br /> Project Component Quantity Description <br /> Project Component Quantity Description <br /> I Mass grading-land —21.5 acres Mass grading and land contouring to natural valley form and <br /> Contouring 130,000 CYDs reconnect groundwater interactions. <br /> 2 New Channel Creation 4,810 feet New channel excavated in approximate alignment of pre- <br /> -2.4 acres disturbance channel.Average channel excavation is <br /> approximately 23 feet bankfull width and depths from I.I to <br /> 3 feet. <br /> 3 Low Permeability Layer —4.4 acres A low permeability liner constructed below the new channel <br /> 8,400 CYDs and riparian zone to minimize infiltration/water loss from <br /> the constructed channel and wetlands areas. Formed from <br /> processed compacted native fines and gravel. <br /> 4 Aquatic Habitat —19/19 Within the new channel riffle-pool-glide sequence will be <br /> Instream Riffle-Pool- formed for aquatic habitat and instream bed form diversity <br /> Glide along with non-structure micro habitat features. <br /> Sequences/Micro-Habitat <br /> 6 of 7 <br />