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<br />.: ;- ,1\ L~ :;:~ I'.. <br />" <br /> <br />Appendix C contains information regarding the methodology used in the alternative <br /> <br />evaluations. -A-p.rim:1ry oonoorn of Ko.nsno o.ns Cele~se is that this prejeet sheblls Ret <br /> <br />adversoly affeGt tho .^.rkGncGs Rivor Compnot. The flrajest ....'i11 Aat reslolse the aR'lel:lnt <br /> <br />ef Wo.tor that io to be-availablo in tho .'\rkansGls River systeR'l fer KaAsas. In summary, <br /> <br />NRCS methodology for predicting water utilization is based on individual field analysis <br /> <br />models and a w'ller budget. The models suggest that crop consumptive use will not <br /> <br />change as a result of the project actions. Irrigation application will be improvedjg,Jl <br /> <br />ooint aRQLQ'}<;hi,.,(L'-"!~.J;;9L!Qi1i9ns in the 1950s when an extensive I~bor force t9C <br /> <br />irriaatioQ':tL~.S",fl.v~E:~!.~J1Dr:U~t~_:1n water from Pueblo Reservoir wasn't causina <br /> <br />ilJcre"~_eQ..~e9P~Q~.JI]~~t7.~.Jn_dtt~nd canals: as we~1 as increasina irriaation <br /> <br />erosi9Il..7 <br /> <br />There are ap["Jroxil'T'ately 400 wells in the watershed area, producing about 14,936 acre <br /> <br />feet per irricm~ion S'~:1son for sUDPlemental irrigation water. The neeel te bltili2e these <br /> <br />wolls wi!l-t~CU:"f':'''cLas-a-reBHlt of improves utili2atieR ef siverles sblRase irriealien <br /> <br />waleH- <br /> <br />The nitrate lev>?1 cf well waler will be reduced by an estimated 72 percent within the <br /> <br />treated ar>?'l. Tilis i,> exnected to reduce nitrate levels in the groundwater to acceptable <br /> <br />state stand:m!s. T!'>? nitrate level in the Arkansas River will also be reduced. <br /> <br />The total selenium concentration levels at the gage at La Junta will be reduced from 17 <br /> <br />microgmms/!'ter to 13.1 microgmms/liter through project action. The reduction will <br /> <br />improve the qlJ'l"~:! cownstream and to the John Martin Reservoir. Other trace <br /> <br />~85 <br />