2023-01-09_REVISION - M2021052 (29)

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May 2022 Table 3. Sound Monitoring Data (Ambient for the Rifle Pit#1 Property) Sound Monitoring SCI-001 Sand&Gravel Operations Rifle Pit#11,Colorado Distance from Measured Noise Level Ambient Noise Measured Ambient Noise Active Mining (dBA) Measurement Location Level (dBA) Operations 25 ft. 85.7 - 50 ft. 82.5 75 ft. 79.1 100 ft. 77.8 125 ft. 76.3 150 ft 75.3 175 ft. 74 CDOT Fence(Fence 200 ft. 70.8 between CR 346 and 1-70) 71.2 225 ft. 69.9 Centerline of CR 346 69.8 250 ft. 68.5 275 ft. 67.9 300 ft. 66.8 325 ft. 66.3 350 ft. 65.7 375 ft. 65.5 SCI Property Line 60.7 100-ft inside SCI's 400 ft. 63.9 Property Line 55.7 (Source: Noise Monitoring was performed with a calibrated 3MTM SD-200 Sound Detector by Daniel Spahn, Sr. Safety Manager for Scott Contracting Inc.) This noise monitoring session shows that hearing protection should be worn whenever anyone is 40 feet or closer to any processing equipment in use at the pit. 2.12.4 Visual Mitigation Scott`s proposed operation does not exceed the 30-acre threshold at which mining is required to "phased"to minimize cumulative visual impacts. Figure 2, Figure 3, and Figure 4 describe and depict the mining stages for Phase 3 of this project which include the construction of a perimeter berm. Scott has made efforts to mitigate the visual impact of the project through the use of these berms along the perimeter of the site. These berms will be placed inside of a 25- foot set back area from the property line and wetland areas. These berms will be roughly 5- feet in height and 23-feet wide at the bottom built at 21-1:1 V slope. The berm will support noise mitigation during operations and provide a screen to buffer visual impacts. The berm will be constructed prior to commencing any mining activity (Phase 3 Mining Extraction). Site preparation activity as described in Phase 1 Site Development and Phase 2 Mining Preparation, such as removal of overburden, shall proceed prior to the construction of the 2-22