2023-01-09_REVISION - M2021052 (29)

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!HC Sc,)tt - Rite Grave! P,' #1 ;;;ay 202,' The portion of the tailwater channel in the western portion of the property, where adjacent wetlands have developed, will not be altered as part of the proposed activity. Scott will also implement the following additional actions to support the goal of complete avoidance of direct impacts to, or discharges into, area of wetland character: • Use silt fence or other physical barrier indicators to mark the boundaries of the wetlands delineated on the Rifle Pit property during Phase 1 Site Preparation and construct a perimeter berm at least 25 feet from the delineated edge of the wetlands. • Reclaim and revegetate the berm surfaces to control erosion and sedimentation off the berm surfaces onto surrounding areas, including nearby wetlands. • Monitor the wetland condition and extent, and surface water conditions, throughout Phase 3 Mining Extraction. Monitoring will use standard wetland delineation techniques in compliance with Army Corps requirements. • Monitor the current groundwater depth and the response to mining activities throughout Phase 3 Mining Extraction, using professionally installed piezometers currently existing on the property. Section 7-204. Drainage and Erosion The existing topsoil will be stripped and used to surface the required 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 2H:1 V slope. This berm will also mitigate noise produced during operation. These berms will serve many purposes but for specific to drainage and erosion control they will prevent runoff of stormwater and intercepted groundwater off site and protect the operations from the influence and flooding by the Colorado River. The areas that are disturbed from the mining operations but not excavated into the pond (primarily the operations pad) will be contoured so they can be revegetated and will be revegetated to stabilize the surface from erosion. Section 2.12.8 addresses the temporary and permanent seeding activities and mixes to minimize erosion on and off-site. This section also addresses the larger reclamation plans for the site. The site will have an 12.56-acre pond when the proposed mining is finished and reclamation is complete. When final landform is achieved, the surface will be stabilized by vegetation to reduce further soil erosion from wind or water, provide forage and cover, prevent dust as required by State Statute, and reduce visual impacts. A uniform vegetative cover will be established with an individual plant density of at least 70% of pre-disturbance levels within 4 growing seasons per Garfield County requirements. Noxious weeds will not be counted as part of the 70% cover. The seed mixes provided in Figure 7 will be used to revegetate the site. Section 7-205. Environmental Quality The proposed gravel extraction operations will not cause the air quality to be reduced below acceptable levels as established by the Colorado Air Pollution Control Division. There will be no hazardous material stored or used at the proposed mine. Scott will apply for coverage under an Air Pollutant Emissions Notice (APEN), if needed, upon approval of the project. Based upon experience in similar operations at the Meeker, Colorado site, the first year of operation will likely not require coverage, however, and will inform the APEN application for following years of operation. An excerpt of the email from Mr. Christopher Reinhardt, Environmental Protection Specialist from the Colorado Air Pollution Control Division, to Scott confirming that the operations of the White River Pit near Meeker, Colorado, are below the APEN reporting thresholds of 2 tons per year is included below. 2-15