2024-05-23_PERMIT FILE - M2024025

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Wild Horse Reservoir Project West Test Quarry DRMS 111 Application 2. EXHIBIT B: Site Description NOTE: DRMS Guidance from Rule 6:Permit Application Exhibit Requirements is shown in italics for each section. 2.1 Vegetation & Soil Characteristics 6.3.2(a)A description of the vegetation and soil characteristics in the area of the proposed operation. The local office of the Natural Resources Conservation Service (NRCS) may provide you with this information as well as recommendations for Exhibit D—Reclamation Plan. Per the Natural Resources Conservation Service (NRCS) and the United States Department of Agriculture (USDA), the area of interest consists of Betermer very gravelly loam, with 3 to 40 percent slopes. The Betermer soils consist of shallowly deposited, well drained, coarse grained slope alluvium derived from volcanic breccia.The soil deposits can range from zero to 11 inches deep on slopes, with weathered bedrock and residual soil ranging from 11 to 60 inches deep.The soils are generally about 40 percent gravel or rock fragments and 18 to 27 percent clay. It is common to find very small root systems in the soil deposits. The Betermer soil deposits largely support livestock grazing and/or wildlife habitat. The existing vegetation consists mainly of Arizona fescue, Indian ricegrass, blue grama, mountain muhly, needle and thread, and western wheatgrass. 2.2 Permanent Man-Made Structures 6.3.2(b) Identify any permanent man-made structures within two hundred (200) feet of the affected area and the owner of each structure. Each structure should be located on Exhibit E—Map. There are no permanent man-made structures within 200 feet of either test quarry section site.The closest existing structure is a two-track road to the proposed areas of disturbance,which is approximately 750 feet away from the West Test Quarry Test Section 1. This two-track was constructed for previous geotechnical investigations as directed by the Applicant. 2.3 Water Resources 6.3.2(c)a description of the water resources in the area of the proposed operation. Identify any streams, springs, lakes, stock water ponds, ditches, reservoirs, and aquifers that would receive drainage directly from the affected area. Provide any information available from publications or monitoring data on flow rates, water table elevations and water quality conditions. The proposed 5.25-acre site (accounting for both sections combined), is located within the selected areas of interest. The proposed sections do not have any distinguishable water resources within them. Possible shallow drainage areas may run east and west 250 to 500 feet outside the proposed quarry test sections due to the relatively high topographic relief of the area. Surface water and precipitation would follow these drainage pathways to lower topographic areas and infiltrate into the medium permeability soils. There has not been any water level monitoring or water quality analysis performed in the West Test Quarry area. However, in 2023 Tetra Tech installed and has been monitoring observation wells that are located over 1,000 feet away from the proposed test sections. The water table has been observed at 60 to 80 feet below ground surface; given the test quarry sections are higher in elevation than the installed observation wells, the groundwater table is likely more than below 80 feet from the ground surface. TETRA TECH May 2024 4