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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />OJJ996 <br /> <br />Control Project. In addition, the Secretary was authorized <br /> <br /> <br />and --,jirected to expedite completion of planning reports 'On <br /> <br /> <br />twelve other units, including the Lower Gunnison Basin Unit. <br /> <br /> <br />Public Law 96-375 of October 1980 authorized the feasibility <br /> <br /> <br />level investigations for the Lower Gunnison Basin Unit, <br /> <br /> <br />which were completed and published in December 1982.1 <br /> <br />The salt pickup from the Lower Gunnison Basin Unit is mostly <br />attributable to deep percolation into the groundwater system <br />from conveyance system seepage and irrigation. The seepage <br /> <br />and percolation waters dissolve salts from the soil and the <br /> <br />underlying Mancos Formation. Consumptive use of water and <br /> <br />evaporation leave higher concentrations of salts in the <br /> <br />return flow entering the UncolLpahgre and Gunnison Rivers <br /> <br />directly or tbrough the groundwater system. Because of the <br />weathered and fractured nature of the parent shale, the <br />groundwater readily flows to drains or directly into the <br />rivers.1 <br /> <br />Several alternatives were evaluated which would reduce the <br /> <br /> <br />salt contribution of the Uncompahgre Valley. The plan <br /> <br /> <br />recommended by the study team and adopted by the Bureau of <br /> <br /> <br />Reclamation includes installing concrete lining on all un- <br /> <br /> <br />lined portions of tbe South Canal (on which proposed hydro <br /> <br /> <br />projects Nos. 1-5 are located), lining four other canals in <br /> <br />E-10 <br />