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<br />CHAI'TER 9 _ FEASIBILlTY.PHASE STUDIES <br /> <br />associated costs required to eonductth~ feasibility phase, will not be prepared until the <br />spomor makes a decision toprocced to the feasibility phasc. <br /> <br />lffurthcr studies are conducted, the ne;\;t phase would bea feasibility study, The <br />feasibility study would focus on a more detailed evall.lation of the alignment B diversion <br />channel to refine lhe alignment and determine if a design event afgreater or less than <br />30-years would be more cost effective, Detailed mapping and soil borings would be <br />obtaincd,andnecessaryhydrolagieal,hydraulie,andgeotechniealanalyses would be eon- <br />dueted. The National Economic Development (NED) plan, which is the plan that maxl- <br />miles net benefits over casts, and the locally preferred plan would be identified. The <br />environmenml, cultural,andothcrimpactsoftheplan wouhJ be fullye valuated, including <br />a preliminary haT.atdous and toxic waste (HI'\-V) assessment of the project area. If an <br />HT\V problem is identified within the project area, all associated cleanup com would be <br />thenon-F.::(kral sponsor's responsibility. Soil borinp would becompletcd at the bcgin- <br />ning of th~ feasibility study in order to identify early any unexpected costs associated <br />with eontaminated areas, <br /> <br />Based on the preliminary rev'iew, there is an indication that a plan ean be <br />developed ill which net adverse impacts could be considered insignificant. 11 is, <br />therefore, likely that preparation of an cnvifOllmental impact statement (EIS) will not be <br />necessary. !fan EIS I>'L'1'C determined necessary, the scopcofstudies would T\<xd lobe <br />modified to include these additional costs. The feasibility studies wou\d require approx- <br />imately 36 months to <:omplele, Baled 011 current cost-sharing policy, half or th~ cost <br />offcasibilily-phase studies ml.lst be provided by anon-Federal sponsor, However,upto <br />hdl!" of t~le non-federal Ihan' can be provided ;n the f\lrm of in-k\ml services, The <br />",timatcd COlt of the feasihility-phase Itudics is '$638,000, An updated Initial i'rojed <br />Management Plan 01':>'11'), which dt'W:l.lments the Federal and non-Federal eriorls and <br /> <br />'-1 <br /> <br />9-2 <br />