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<br />Fish Creek Reservoir Expansion EIS <br />rr.,%..~~~<<-~$~'Z?,.;<:::~;:;:;:;';.:<2~,~;::&'"R~;:;:~~~'%-.~~~~~W,.i:;l::;:';'&">>~W~~;:::::>:;:"'-:;:~:0:::B:W:::0.~l;:;:::;:;:;.;:..."'3:W'.?:'$'Xi:::'&3>>: <br /> <br />of Map Unit 74 along Road Corridor Option 1 as compared to the higher productivity soils of Road <br />Corridor Options 2 and 3 indicate that less potential soil productivity would be lost as a result of <br />the selection of Road Corridor Option 1. Given a regional perspective and assuming that Forest <br />Service road stabilization and revegetation requirements are followed, there is little overall difference <br />between road corridor options in terms of the effect to soil productivity and the potentials for soil <br />stabilization. . <br /> <br />4.6.3 Cumulative Impacts <br /> <br />No cumulative soil impacts have been identified. <br /> <br />4.6.4 Mitigation and Enhancements Summary <br /> <br />Surface soil horizons from approximately 8.8 (Alternative C) to 15.0 acres (Alternative B) to be <br />inundated would be salvaged as a part of the wetland mitigation program and reapplied to wetland <br />mitigation sites. The productivity value of the salvaged soils would be retained as a result of the <br />reclamation program. <br /> <br />4.6.5 Unavoidable Adverse Impacts <br /> <br />Under Alternatives B and C, minor losses of soil materials suitable for revegetation would occur <br />during salvage operations due to innate equipment inefficiencies. Soil erosion on regraded and <br />resoiled areas would likely occur to a small degree, until vegetation has become fully established and <br />reclamation is successful. <br /> <br />4.6.6 Irreversible and Irretrievable Commitment of Resources <br /> <br />Under Alternatives B and C, soil materials not salvaged for revegetation would be lost as a result of <br />inundation, use as fill, or burial beneath the roadbed during road construction. <br /> <br />4.7 VEGETATION <br /> <br />4.7.1 Introduction <br /> <br />This section details the potential impacts of the project alternatives on the vegetation resources <br />proximal to the existing reservoir. Measurable effects of the Proposed Action on vegetation <br />resources more distant are not anticipated and, therefore, will not be addressed in this document. <br />The impacts identified are those which can be reasonably expected to occur as a result of the <br />implementation of alternatives detailed in Chapter 2. The direct effects of the project to one <br />panicular vegetation community, wetlands, is separately discussed in Section 4.5, owing to that <br />community's particular imponance with regard to Corps of Engineers permitting requirements. <br /> <br />Because the potential impacts to vegetation as a result of project evolution are directly related to <br />physical disturbances, no adverse effects could be considered common to all alternatives with the <br />exception of a small amount of disturbance due to powerline burial. However, two imponant <br />conditions are common to all alternatives. These conditions are that no impacts are anticipated as <br />a result of project construction and operation to: 1) thCeatened, endangered, or sensitive plant species, <br />or; 2) to the grazing management of the area. These conditions exist due to the management of the <br />grazing allotment (restriction of grazing etc. within 500 feet of the reservoir), and the fact that no <br /> <br />:lliY'<<~~%~~..~~....'N'y:.:-:::-~>>>>~~;:m::;->>~~~:>>m:::;:>'~;,,<"''-:<','l<'::;';:';$::::;:::~;:;W;:::W~1~W.$.0;:';,*,"?~:::i;:;7..m~~::~ <br /> <br />Page 4.22 <br /> <br />Xpum/XY /993 <br />