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Section 13 <br />Geochemical Data and Analysis <br />Summary of Findings: The water balance estimates and the UNSAT-H simulations <br />indicate that significant percolation from the base of the development rock pile is <br />unlikely. These evaluations further indicate that infiltration of precipitation followed <br />by upward evaporative flux of water stored within the development rock areas are <br />dominant mechanisms controlling the volume of percolation. Minor differences in the <br />physical characteristics and the magnitude of annual precipitation are less important <br />controls on the expected volume of percolation. <br />The results of these estimates correspond to the input parameters including the <br />development rock physical and hydrologic parameters, and the available climate <br />data. Site-specific climate data are not available, and differences between actual <br />climate conditions at the site and the data compiled from the Uravan and Montrose <br />weather stations could result in variations in percolation through the piles. <br />• <br />• <br />13-9 <br />T:\84988-Denison Mines\Task Order 4 - EPP Sunday Mines Group-Van4\Van4\FINAL Report\FINAL - Environmental Protection Plan Van4.doc