2020-12-08_REVISION - M2008078 (23)

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ERC West Farm Pit Expansion Project Site Aquatic Resource Delineation Report EXECUTIVE SUMMARY This report summarizes the delineation of aquatic resources completed by Ecological Resource Consultants, Inc. (ERC)for the West Farm Pit Expansion Project Site (survey area).The survey area subject of this aquatic resource delineation is defined as an approximately 957-acre portion within the Mine Permit Boundary of the Prowers Aggregate Operations West Farm Pit(WFP Facility). ERC conducted a formal routine onsite delineation of aquatic resources within the approximately 957- acre survey area located east of the Town of Lamar, Prowers County, Colorado on November 5, 2020 (Figures 1 and 2).A total of 36.70 acres(1,984 linear feet)of aquatic resources were identified and mapped within the survey area characterized as riverine (R4SBCx)wetland habitat, palustrine emergent persistent temporary flooded (PEM1a) wetland habitat, palustrine emergent nonpersistent seasonally flooded (PEM2c) wetland habitat, and riverine lower perennial unconsolidated bottom intermittently exposed excavated (R2UBGx) wetland habitat. Five aquatic resources were identified in the survey area and were mapped as Aquatic Resource A, B, C, D, and E. Aquatic Resource A is an irrigation ditch located in the central portion of the mine and runs west to east. It flows to a large retention pond located in the central portion of the survey area. Aquatic Resource B is a freshwater emergent wetland. Hydrology within this aquatic resource is supported by pumped water from existing mining operations within the WFP Facility. Aquatic Resource B terminates within the north portion of the survey area by rising topographical features. Aquatic Resource C is the continuation of Aquatic Resource A. Aquatic Resource D is a low depression situated north of County Road HH 8/10. It is bounded on all sides by upland topography and vegetation. Hydrology within Aquatic Resource D is supported by a mechanical pumping system that pumps water from Aquatic Resource C during the growing season. Aquatic Resource E is a perennial stream that flows to the east and joins the Arkansas River located directly northeast of the survey. During the site visit on November 5, 2020 conducted by ERC, irrigation was not occurring throughout any of the survey area. However, flowing water in areas was observed within the Aquatic Resource E stream channel along the Highway 50 right-of-way. Refer to Figure 3 for an approximate geographic overview of the offsite drainages to the Arkansas River. All areas that have been investigated in the field are mapped on the enclosed Aquatic Resource Delineation Map (Appendix A).