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Evaluation of Potential Impacts <br />to Wetlands on the Sage Hill Farm from the <br />Proposed Nix Property <br />Sand and Gravel Operation <br />pond is filled by an irrigation well immediately to the east of the pond. Figure 2 shows the <br />locations of irrigation ditches and other water features in the immediate study area. <br />The Nix property is relatively flat and located in the historic floodplain of the St. Vrain River. <br />According to the geologic map of the Boulder-Fort Collins-Greeley azea, Piney Creek alluvium, <br />Broadway alluvium, and eolian deposits underlie the Nix pit. Piney Creek and Broadway <br />alluvium are described as sandy and gravely deposits azound 20 to 30 feet thick, respectively. <br />The water table is reported as being from 5 to 20 feet below the surface in the southern and <br />central portions of the site, and less than 5 feet in the northem portion of the site on the "Depth to <br />Groundwater Table Map,.." by the U.S. Geological Survey (USGS). <br />According to the soil survey, a variety of soils exist on the Nix property, including Valant sand, <br />Bankhard sandy loam, Lund clay loam, Vona loamy sand and aqualls and aquents. This latter <br />mapping unit occurs in the northem portion of the Nix property where high groundwater (less <br />than 5 feet) is reported on the USGS water level map. Vona sandy loam is shown as occumng in <br />the subject wetland. <br />Wetland on Sage Hill Farm <br />An approximately 11-acre wetland exists in a relative low spot immediately south of Weld <br />County Road 28 on the Sage Hill Farm. The approximate limits and features of this wetland aze <br />shown on Figure 2. Photographs of the wetland aze attached. The wettest portion of the wetland <br />occurs in the north and east portions of the wetland where a ditch ("slough") was dug yeazs ago, <br />presumably to improve agricultural drainage conditions (Photographs 2 and 4). The wettest <br />portion of the wetland is dominated by three-squaze bulrush, with some azeas of hazd-stem <br />bulrush and cattails. These species typically occur in areas with seasonally or perennially <br />saturated soils and often standing water. Slightly drier azeas of the wetland that have saturated <br />soils, but likely not substantial standing water, aze dominated by spike rush, Nebraska sedge, <br />07 t-074.000 Wright Water Engineers, Inc. Page 2 <br />November 2001 <br />