2024-05-23_PERMIT FILE - M2024025

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Wild Horse Reservoir Project West Test Quarry DRMS 111 Application Residual soil not suitable for processing will be stored in separate stockpiles as shown in Exhibit E. Residual Soil may be used for any site fill requirements including laydown, stockpile, and equipment pads, roads, berms, and turnouts and other temporary platforms. 3.2.4 Deposit to be Mined 6.3.3(d)specify the thickness of the deposit to be mined. The target deposit will be mined to Elevation 9270 for Test Section 1 and Elevation 9120 for Test Section 2. Using 2018 LiDAR topography data, this results in a maximum thickness of approximately 115 ft for Section 1 and approximately 65 ft for Section 2 within the shown limits of the test sections. 3.2.5 Operation Components 6.3.3(e) describe the major components of the mining operation such as: roads and access routes, pit, office, shop/maintenance buildings, plant, processing facilities, and any underground openings such as adits or ventilation facilities. These components must be located on Exhibit E—Map. The proposed mining operation is a small-scale version of a full rock quarry, which may also produce sand and gravel. Material crushers, screens, and stockpiles will be placed in the Common Processing Area.Access roads will need to be constructed and improved in order to support the hauled and processed quantities. The mining operation will not include any underground openings such as adits or ventilation facilities. 3.2.5.1 Common Processing and Materials Handling Area The Common Processing and Materials Handling Area (Common Processing Area, CPA) is not included in the 111 permit but is discussed within this mining plan exhibit because of its role in temporary placement of surficial soils and product material stockpiles as well as its role in processing the materials generated from the test sections.The Common Processing Area is proposed to be constructed approximately 0.5 mile from West Test Quarry Section 1. The size of the Common Processing Area will be 1200 ft by 800 ft, or approximately 22.1 acres. The processing area will be fenced to deter livestock and to protect equipment from unauthorized access. All processing equipment will be located within this footprint.Office trailers,washrooms,testing labs, and parking lots will also be constructed within this same footprint to administer the operations. Development of areas for crushing, processing, testing, stockpiling, equipment deliveries,water storage, and personnel parking will include construction of access roads and pads. 3.2.5.2 Access Roads Earthmoving will be performed using a combination of mobile mining equipment including, but not limited to: drills, loaders, excavators, dozers, blades, haul trucks, and water trucks. The existing two-track alignments will be used as practicable for earthmoving access to the West Test Quarry sections; however, some road improvements are required and described along with the disturbance dimensions. Due to the expected duration and time of the year of the project, road maintenance is expected to be minimal. Dust control will be performed using a water truck for the access roads. In areas susceptible to rutting or pooling, aggregate base course would be placed to minimize additional realignments. 3.2.5.3 Test Quarry Sections Test quarry extraction will be open cast.Test quarry activities will include drilling and blasting;loading and hauling; and washing, sorting, and crushing. Where soil and/or weathered rock is encountered, excavation will occur directly by bulldozer, backhoe,loaders,and/or excavators.Where moderately-weak weathered rock with favorable discontinuity patterns is encountered, pre-treatment via ripping (i.e., using a tine attached to the rear of a bulldozer) will be carried out to break up the rock for removal by bulldozer blade. In the case of strong TETRA TECH May 2024 10