C150240 Wetland Delineation and Preliminary Jurisdictional Determination

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National Wetland Inventory ' The U.S. Fish and Wildlife Service (USFWS) National Wetland Inventory (NWI) (USFWS 2014)classification for the project area is found in Table 2. ' Table 2. USFWS NWI Classification for Bull Creek Reservoir#4 NWI Classification Cowardin Class Location Palustrine/Aquatic Bed/Intermittently Exposed/ PABGh Diked-Impounded Bull Creek Reservoir#4 PEMB Palustrine/Emergent/Saturated Wetland tHUC/Quad Map The survey area is located in the Colorado Headwaters-Plateau sub-basin of the Upper Colorado ' Region watershed, HUC 14010005. BCR #4 is located within the Mesa Lakes, Colorado U.S. Geological Survey(USGS) 7.5 minute quadrangle. WATERS OF THE U.S. (WoUS) Delineation Methods WestWater biologists performed a wetland delineation for Bull Creek #4 on August 18 and 21, 2014. ' The wetland boundaries were identified on the basis of the vegetation, soils, and hydrologic characteristics present at the site in accordance with U.S Army Corps of Engineers (ACOE) standards included in the "Corps of Engineers Wetland Delineation Manual, January 1987" ' (ACOE 1987) and Regional Supplement to the COE Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region (Version 2.0, May 2010) (ACOE 2010). The wetland boundary delineation included identification of plant species, species composition, and soil ' structure. Soil borings (18 ± in. deep) were taken with an auger for observation of wetland soil characteristics and hydrology indicators to aid in the delineation of wetland boundaries. Wetland boundary points were marked in the field and located using an Ashtech ProMark 100 sub-meter ' accuracy GPS unit. Boundary point latitude/longitude locations are listed in Appendix B. A site visit was made by WestWater and the ACOE on September 5, 2014 to verify the wetland delineation. Delineation Findings On the basis of wetland vegetation, soils, and hydrology, WestWater identified carex dominated emergent (persistant) wetland, willow dominated scrub-shrub wetland, and fen within the survey boundary. A total of 9.67 acres of wetland was identified within the survey area (Figures 2 ' through 6). The fen locations were delineated in 2009 by WestWater biologists, determined by soil sample analysis. Data collected at the wetland and upland boundaries were recorded on ACOE data sheets which are available in Appendix C. Photographs of the project area are ' attached in Appendix D. A Preliminary Jurisdictional Determination is attached following the report. Individual acres of each aquatic resource class are found in Table 3. 1 WestWater Engineering Page 2 of 10 December 2014