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A ERC <br /> 10 feet high, have 3H:1V upstream slopes and 3H:1V downstream slopes with a 20-foot-wide crest. <br /> Embankments are constructed of compacted fill materials placed in thin lifts. The downstream slope of <br /> the existing ponds were seeded and hydro mulched to provide a vegetative cover to reduce wind erosion. <br /> Any new ponds will be completed in this same manner. The ponds are designed with a drain systems <br /> where water can be removed from the basins via a flexible hose attached to a riser pipe that has an outlet <br /> pipe that extends under the embankment and ultimately back into the reservoir.A schematic of the outlet <br /> is provided in Figure 4.1. <br /> Figure 4.1: Settling Pond Outlet Schematic <br /> lowing atsc <br /> N'.6'ficcuring Tee—� 6'Cie.f ku1We <br /> HOPE Hose w/f la-ge <br /> Adapter 1'.7 <br /> \WOO_ <br /> - •__ 1 1 <br /> 6'dla HDPF 911-c Flange <br /> ell Flange Adeptly wl <br /> 9ackup Flange <br /> 7S'alit r40Pr allnd Flange wv- L Fill oottore at pbe <br /> Flange.klaoter 6 Bested Flarge with conereae <br /> ar HOPE pipe 0.6 wi Welded <br /> HOPE Plate <br /> Dewatering has also been carried out using the existing ponds at the south end of the N1 stockpile (see <br /> Drawing C-4). To support the cyclone operation during the irrigation season when FRICO is using the <br /> Gilmore Ditch, these ponds may serve as temporary holding and clarification areas for slurried dredged <br /> materials. Once the water in the ponds has cleared, it will decant over the pond crest and flow into the <br /> Evans #2 ditch, ultimately reaching Christina Pond. Here, further clarification can occur before it flows <br /> into the Gilmore Ditch. <br /> 4.2 STOCKPILES <br /> Stockpiles have been strategically positioned within the mine area to make use of available space and <br /> maximize the amount of storage. The layouts included working around, providing sufficient buffer for, <br /> and allowing access to the oil/gas well sites that are located within the area as shown on Drawing C-10 <br /> and C-11. Ultimately,the objective is to sell the dredged materials, however, if the demand falls short of <br /> the amount produced,stockpile storage will be necessary. Consequently,the stockpile will be constructed <br /> as needed to contain the materials being removed and not sold. The stockpiles will be developed to form <br /> a stable configuration with side slopes no greater than 3H:1V. The stockpile surfaces will be stabilized by <br /> creating a vegetative cover that controls dust and enhances resistance to erosion caused by runoff. This <br /> 11 <br />