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~JI'.~ rog '... _~J Alternatives, Including Proposed Action 2-29 . Evidence of the Sponsors' capability to acquire (purchase or option to purchase or lease) the mitigation sites . Standards and a schedule for determining the success of the mitigation effort. . Description of specific management actions that would occur at the mitigation site(s) . Description of a soils management and amendment program . Description of vegetative treatments and revegetation methodology including species selection, seed mixes, spacing of woody vegetation and the source of plant materials . Drawings, prepared upon site completion, showing elevation in plan view and cross section, sources or water and structures to maintain hydrology The wetland mitigation plan would be implemented concurrent with project construction, and be completed prior to project operation. The Sponsors will be responsible for management and funding the maintenance of the wetland mitigation sites. There are private, public, and semi-public organizations that currently or may in the future manage other wetlands in the area, The Sponsors may contract with such entities for wetland management if it appears prudent. In any case, Sponsors will ultimately be responsible for the success of the mitigation. Creation of new wetlands in the Uncompahgre River floodplain may involve some lowering of surface elevations so that the water table is available to plant roots. Elevation lowering will usually produce enough hydric topsoil that soil augmentation is not necessary, Hydric soils are abundant throughout the floodplain (Greystone, 1994), If a special situation occurs where soil augmentation is necessary for plant success, then the soil can be drawn from adjacent, non-wetland sources. Planting and handling guidelines established by the NRCS, COE, and other agencies, will be used, Woody riparian species, particularly cottonwoods and willows, will be overplanted to ensure long-term growth to mature stands. Sponsors would also finalize, prior to project construction, a mitigation plan for the replacement, augmentation and monitoring of riparian cottonwood and shrub vegetative types. The plan would be contingent and formatted upon the baseline identification and mapping of these particular vegetative types, and the predicted widening of the stream channel within the different stream reaches identified in materials filed during the 404 review process (especially the Uncompahgre River Bank Stabilization Final Report, (May 1995)). The plan will include an approximate prediction of the surface area impact to these plant communities and the Sponsors' proposed replacement methodology. This replacement and augmentation plan will contain information on plant spacing, handling and storage, source of plant materials and performance standards for monitoring success. 2.4.5.3 The Wetland Mitigation Site In addition to on-site mitigation and the supplemental mitigation sites, the Sponsors would create a 12-acre wetland (Site) near the proposed powerhouse (see Figure 2-12), with 8 acres devoted to compensating for bank stabilization and stream adjustment impacts. The balance (4 acres) will mitigate canal-bank wetlands that may be lost due to AS Lateral Hydropower Project July 2000 , ,~- .."~ ., - ,,A-,,-.b- :".4:..~,,:.