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<br />C.J <br />00 <br />CV') <br />N <br />g Finally, a study of the entire Lower Virgin River Ivas liIade to <br />define the hydrologic and sal inity regimes to detet'lllillt' whether illlY <br />other sources of salt loading exist ill that rt'ilcll (ht'sidt's littlt'firld <br />Springs). The Bureau cOlltracted with the Oesert Resoarch Illstitute to <br />perform a l-year study to cover the annual flow cycle of the river. <br />Additional shallow observation wells were installed and existing wells <br />were inventoried. The river's flow and quality were monitored at six <br />points. While the data gathering program and the analysis were more <br />intensive than had been done previously, various uncertainties still <br />exist about the basic hydrologic processes and, consequently, in the <br />analYSis as well. Nonetheless, the results did not provide conclusive <br />evidence of salt loading along the river other than the known <br />discharge from Littlefield Springs. <br /> <br />In conclusion, no satisfactory basis was found to formulate a <br />project to control salinity on the Lower Virgin River by collecting or <br />treating Littlefield Springs flow or ground water. It is further <br />concluded that the investigation should be terminated. <br /> <br />The U.S. Soil Conservation Service has formulated a proposal to <br />reduce salt loading by reducing deep percolation from irrigated <br />agriculture. A separate report is available on that proposal. [2J <br /> <br />4 <br />