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<br />Fish Creek Reservoir Expansion EIS <br /> <br />~0.:;:;.?-'~;.~:?.;~~i;::,,~:>>::;::::::;:;:;:;:'::;::'~;:::;:>>?X~;::::';~~~&.:&:'i;t:.'?'wW...x;:1;":~.<<0.~:::;:.;.:;:;x.:<.&M~d~:;:;:;.:::;.:.wZ::;:;:::;:;:;:;';';:;';::;$'::~~,:;l:}::&.::::<:;::>",,:::::~~:~.;:::i;:;:::;:~:::;:;W;:;:>>;::K'.r.~~~~:~?~;:.;~:::>>3m;:;:::;::"",~:>>;" <br /> <br />4.6.2 Direct and Indirect Impacts <br /> <br />4.6.2.1 Alternetive A . No Action <br /> <br />Under Alternative A, the project area would essentially remain in its existing state. Future impacts <br />to soils would parallel existing impacts. Natural erosion rates and soil productivities would mirror <br />those occurring at this time, assuming that land management policies and uses of the project area do <br />not change significantly in the future. <br /> <br />4.6.2.2 Impacts Common to All Action AlternltivlS <br /> <br />Impacts to the soil resource, under Alternatives Band C, include those which would affect the <br />chemical and physical nature of the endemic soils as well as the volumes available for reclamation. <br />Soil chemical and physical parameters would be permanently modified as a result of a soil <br />reclamation program. Soil horizons would be mixed during salvage resulting in a blending of <br />characteristics as compared to.the soils in their natural state. Assuming that only soils suitable for <br />reclamation would be salvaged, blending should not result in the degradation of soil resources in <br />terms of reclamation potential. Soil chemistry would also be modified through soil stockpiling as <br />anaerobic conditions within the stockpiles develop. Soil chemical changes due to stockpiling are <br />considered to be short-term and redeemable to a level commensurate with adequate vegetation <br />establishment following re-soiling. A soil sampling and analysis program should adequately address <br />the soil chemistry concern and limit this impact to the short-term. Isolated spill accidents, should <br />they occur, could result in minor soil contamination from oils, solvents, etc. Such spills would <br />normally result in soils deemed unsuitable for reclamation. Soils so affected can be buried to <br />effectively reduce the effects of this impact. The volume of soil subject to spills should be limited <br />and no impact to revegetation potential would be anticipated. <br /> <br />4.6.2.3 Alternative B . Proposed RlServoir Expansion <br /> <br />Approximately 60.6 acres of soils would be directly impacted by either inundation, removal for fill, <br />or surface'disturbance as a result of Alternative B. Inundation would affect 51.4 acres as a result of <br />increasing the reservoir storage capacity corresponding with a raised shoreline elevation. Included <br />in this total are the 36.2 acres of disturbance associated with Borrow Area A-I. It is assumed that <br />the majority of soils associated with Borrow Area A-I would be used in the construction of the <br />proposed dams and associated facilities thereby rendering a permanent loss of these soils in terms of <br />vegetation productivity. The majority of the remaining 15.2 acres of soils would be inundated and <br />similarly affected in terms of lost production. Construction of the proposed campground would <br />impact a maximum of 7.0 acres of soils. Impacts would be limited to surface and upper subsurface <br />soil horizons as a result of parking lot, trail, and camp site construction. Overall, the impacts to <br />soils would be limited primarily to a permanent loss of a very small, but undetermined, acreage of <br />soil productivity due to a change in land use. Soil erosion could occur to a very limited extent until <br />surface disturbances were stabilized. Given that the revegetation potentials of the vast majority of <br />soils to be affected (map units 44,75, 612e) are "moderate" and the disturbances planned are small, <br />soil erosion is considered to be a limited, short-term, mitigable impact. <br /> <br />A maximum of 2.2 acres of soils would potentially be disturbed as a result of powerline <br />construction. Considering that soil disturbance would likely be limited to the trench in which the <br />line is laid and the area immediately surrounding the trench, the acreage to be disturbed should be <br />significantly less. Assuming that soil materials are returned to the trench as a part of the <br /> <br />:ww.::~-r~~~~~~&.n:~~'<<:;::::&:.f;;~:;:::m:;::Xw.w';:::;:>>::?,?~~::::::,-$;:;;'~X:::::;i::::.....:t.:",:>>.::.::::m:?;:.;::::&:t;..:::;$;:';::?:::..-~;:~;.i;:.: <br /> <br />Page 4.20 <br /> <br />September 1993 <br />