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Mr. Peter Hays <br />TR -28 — 3 Dam Regrade <br />February 24, 2017 <br />made to re -slope the entire 1,800 foot length of the embankment. The area requiring re -sloping is <br />approximately 500 feet away from the active crest area where seasonal deposition and dam building <br />occur. Figure 1 shows the area planned for re -sloping in comparison with the Mill complex. <br />Figure 1 -- No. 3 Dam Site Overview <br />Scope of Embankment Re -slope <br />Henderson will undertake the construction activities during the summer of 2017 with engineering oversite <br />by AECOM, the EOR for the tailings facility. The re -slope will consist of pushing material from the toe of <br />the dam, upward, to the crest. The re -sloping effort will begin on the south side of the embankment and <br />continue to the north. Excess material, estimated at 27,295 cubic yards, will be moved from the <br />embankment slope to the flat area just past the crest and graded appropriately to ensure proper area <br />drainage. Once completed, a new crest will be established approximately 45 feet to the west of the <br />original crest. Instrumentation, including piezometers, will continue to be monitored during the re -sloping <br />activities. Drainage configuration and functionality will not be affected during the project. Figure 2 shows <br />an overview of the area to be re -sloped and the drawings are included in attachment 1. Engineer's <br />certification and as -built drawings will be submitted upon project completion. <br />