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Wattenberg Lakes Gravel Mining <br /> Compensatory Mitigation Plan <br /> Weld County, Colorado <br /> May 2023 <br /> Project Description <br /> ERO Resources Corporation (ERO), on behalf of Holcim-WCR, Inc. (Holcim), is providing the following <br /> information in support of an amendment to the Section 404 Individual Permit(IP)authorization for the <br /> Wattenberg Lakes Gravel Mining project(project) (Corps File No. NWO-2000-80189-DEN). Holcim, in <br /> coordination with the City of Westminster(City), is proposing modifications to the original design of the <br /> reservoirs and associated mitigation for the project. The gravel mining and water storage facilities in <br /> Wattenberg,Colorado (Figure 1). The gravel mining operations have been ongoing since 2005 and occur <br /> along both the east and west sides of the South Platte River. The original design of the project included <br /> construction of three reservoirs on the west side of the South Platte River post-mining operations <br /> (Figure 2). The City is proposing modifications to the reservoir design, including reducing it to two <br /> reservoirs instead of three,and installation of spillway to prevent damage from high flood events along <br /> the river(Figure 3). Due to these modifications to the design,and to provide the highest quality wetland <br /> mitigation, Holcim is proposing modifications to the wetland mitigation required by the project(Figure <br /> 4). This mitigation plan has been developed to address modifications to the project and associated <br /> wetland mitigation areas, and the unavoidable impacts to wetlands and other waters of the U.S. <br /> associated with the project following impact avoidance and minimization. <br /> Location <br /> The project area is in Sections 25 and 36,Township 1 North, Range 67 West;and Sections 30 and 31, <br /> Township 1 North, Range 66 West of the 6th Principal Meridian in Wattenberg,Weld County,Colorado <br /> (Figure 1). The UTM coordinates of the approximate center of the project area are 514393mE, <br /> 4429885mN of NAD 83 Zone 13N. The longitude/latitude of the project area is <br /> 104.831342°W/40.019051°N. The elevation of the project area is approximately 4,940 feet above sea <br /> level. <br /> ERO Project#22-078 1 <br /> ERO Resources Corporation <br />