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Mr. Allen C. Sorenson • • <br />Henderson Mine, Permit No. M-77-342, Revision No. TR-8 Page 5 <br />constructed along the east edge of the berm, and the conveyor system would <br />be walked out onto the areas of deposition to continue the loading process <br />from east to west. In this manner, the HDS acts as its own protective base <br />layer. It also may be feasible to use a small low-pressure density tread <br />tractor or grader to work the top of the deposition areas. <br />3.3 Residual Water Management <br />The pond presently is holding water. As a lined unit, Pond 1.2 will retain <br />undiverted stormwater run-on, direct precipitation, snow-melt, and residual <br />drainage from the HDS. This water would be pumped to the existing <br />discharge drainage sump (located along the west side of the pond) for <br />conveyance to the Henderson treatment system. Once the existing ponded <br />water has been drawn down, a temporary (or permanent) collection sump <br />and submersible pump will be located at the lowest surveyed point in the <br />pond and connected with the existing drainage sump to keep the pond <br />dewatered. At some point, as the pond becomes fully loaded with HDS, a <br />permanent engineered sump and pump located in a 3"-6" ADS perforated <br />pipe will need to be established in the system. However, the need for a <br />permanent location may be several years in the future. It is believed that the <br />permanent location of the sump will be along the southwest edge of the pond <br />as shown in Figure 8. Figure 9 illustrates the pump station that will be <br />emplaced as sludge loading proceeds from east to west. <br />