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<br />trj <br />r-.. <br />N <br />C~l <br /> <br />CHAPTER IV <br /> <br />STAGE ONE DEVELOPMENT AND MONITORING <br /> <br />Development <br /> <br />As noted in Chapter I, development of the Grand Valley Unit was <br /> <br />planned in two stages. <br /> <br />The purpose of this staged development was to <br /> <br />allow Reclamation to begin construction in a portion of the valley where <br /> <br />sufficient data were available to monitor and assess the impacts of the <br /> <br />initial development while investigations and planning continued on the <br /> <br />rest of the unit (Stage Two). <br /> <br />Stage One construction began in October 1980 with the concrete <br /> <br />lining of 6.8 miles of the Government Highline Canal and development of <br /> <br />associated cross-drainage facilities. <br /> <br />This phase of construction was <br /> <br />completed in March 1981. Construction began in October 1981 to consol- <br /> <br />idate 13 open-channel laterals. Lateral construction and installation of <br /> <br />a debris removal structure were essentially completed in April 1983. <br /> <br />Because final Stage One construction costs and cost effectiveness <br /> <br />estimates were not available, for purposes of this report, projected <br /> <br />values were used in estimating the cost effectiveness shown in Table 2. <br /> <br />Monitoring <br /> <br />Hydrosalinity <br /> <br />To assess the effects of Stage One improvements on ground water <br /> <br />flows and quality, a hydrologically closed basin--the Reed Wash study <br /> <br />area--has been equipped to monitor surface and ground water inflows <br /> <br />and out flows. <br /> <br />22 <br />