2024-11-12_PERMIT FILE - M2024057

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A ERC such that the operation can be strategically positioned during the dredging operation to minimize the haul distance from the cyclone stockpile to the fill or other stockpile areas. 4. FUTURE SAND PLANT DIRECT PROCESSING: Future plans include sending slurried material directly to a sand plant.This will enable the separation of soils into specific grain sizes suitable for hydraulic fracturing operations. 4.1 SETTLING PONDS There are five In-Reservoir (In-Res) settling ponds that are located within an outer finger of the Milton Reservoir as shown on Drawing C-5. These were constructed in 2021 in preparation for the dredge operation and consist of adjoining cells separated by low embankments. The cells are constructed such that the crest elevation of the further west basin is one foot higher than the mid cell and the mid cell is one foot higher than the eastern basin. This allows water to overflow from one cell to another when they fill with solids. When the reservoir water level falls in the winter, water drains from the base of these cells. The typical operation involves removing the materials from these basins once the materials have dewatered sufficiently to allow the material to be loaded and transported with haul trucks. Currently the In-Res basins are full. During 2025, materials will be removed from these basins and transported to the West or Load Out Stockpile as shown on Drawings C-7,C-9 and C-11. After the initial year of the dredging operation,it was found that additional settling ponds were necessary to handle the volume of materials being generated from the dredge. Consequently, nine ponds were designed and four have been constructed as shown on Drawings C-5, C-7, C-9 and C-11. The ponds are located in the northwest section of the mine area and each has a capacity of approximately 90 ac-ft. The ponds are grouped as follows. Pond 1: Located furthest north, is a single pond. Pond Complex(Ponds 2, 3A, 3B, and 4): • Pond 2: Highest elevation in the complex. • Pond 3A and 3B: Intermediate ponds. • Pond 4: Lowest elevation;overflows back into Milton Reservoir. • These ponds are interconnected via overflow spillways. Southern Ponds (Ponds 5/6 and 7/8): • Ponds 5 and 6:Connected with an overflow spillway. • Ponds 7 and 8:Connected with an overflow spillway. • Ponds cannot be continuously connected due to an oil and gas line interference. The ponds are irregularly shaped to follow the existing topography and facilitate water cascading from one pond to another through an overflow spillway. The ponds are configured to avoid oil/gas pipelines and workings and to optimize cut/fill to the extent possible. Embankments are limited to approximately 10