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hydrostatic head on the geomembrane liner will be less than two feet. UMC will continuously decant the water for reuse in the mill to minimize makeup water requirements. Typically, tailings will be laid down in a bench, or splay within the impoundment and a barge mounted decant sump pump(s) located at the lowest level will pump the water back to the mill. This pump(s) will be pressure sensor activated (or float switch activated). UMC is incorporating a standard liner keying system. Typically this is a trench 2-L -Sft wide, approximately 32 feet or more from edge of the inside slope, 2 feet deep. The liner is rolled down the trench wall, across the trench floor, and then the trench is backfilled and compacted to the specified embankment compaction standards., Detail, are presented in Exhibit TSF -06. , Geomembrane liner specifications are presented in Figure-Q-64, 45--mil Polypropylene Liner, Gewfe stile Initial TSF Liner .Stahnli.-anun UMC has committed to the Division to initiate removal of the existing onsite ore stockpiles within 60dayst following startup. Thee material is currently stockpiled on the west side of the mill entrance road, at the "Y" for the lower access (south) road. This material is angular and of varying size, but predominately A in with a large fine proportion. The impoundment liner bottom will initially be held in place with water hauled onto the site from the local construction water metenne station. Additionally. tThe impoundment liner will be held in place with material from the ore stockpiles discussed in the ORE STOCKPILES section. The material may be - 4 ef. w placed in sand bags and placed on the liner, and Additionally, the existing on -site stockpiles may also be initial feed stock for mill startup with the tailings reporting to the tailings facility. These stockpiles are on -site and have been covered with visqueen since 2009. Formatted: Space Before. 12 pt Formatted: Font. Times New Roman, No underline Formatted: Underline Formatted: Space Before: 12 pt, After: 12 pt Formatted: No underline Formatted. No underline Formatted: Level 1, Space After: 12 pt Formatted: Space Before: 12 pt Formatted: Space Before: 6 pt, After: 6 pt The slopes of the impoundment will not receive direct placement of -4 • 1'R material. Ballast tubes from the top of the embankment to the bottom of the impoundment, typically constructed from 6m PVC Formatted: Font: 10 pt, Bold tubes or geotextile socks and filled with imhe .affle .,.,._.iinei material or water, will hold the liner down Formatted. Right following installation until the tailings cover the exposed liner. These ballast tubes will be held in place Formatted: Font. 10 pt, Bold 1111990 -057 b1av 14, 2013 ;