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Lamar Gravel Wetland Delineation Ecological Resource Consultants,Inc. <br /> land, bordered by irrigation ditches. At its closest point,the Arkansas River occurs approximately <br /> 800 feet north of the Study Area. <br /> The Prowers County Soil Survey (USDA SWS, 2007) maps the soils within the Study Area as <br /> Rocky Ford clay loam and Las clay loam. Both Rocky Ford clay loam and Las clay loam are <br /> listed as hydric soils of Colorado(NRCS,2007). <br /> Figure 2. Study Area Location (Lamar East USGS 7.5 Minute Series Topographic Map) <br /> - — <br /> 4 , <br /> b•+. j — Apt f A.y I,�". ; <br /> 4 <br /> 4 I} .....1 - <br /> t i <br /> \ k f <br /> (Approximate Study Area Depicted by Red Polygon) <br /> 4.0 Wetland Delineation Methodology <br /> The Army Corps of Engineers(USACE)and the Environmental Protection Agency (EPA)jointly <br /> define wetlands as: "those areas that are inundated or saturated by surface or ground water at a <br /> frequency and duration sufficient to support, and under normal circumstances do support, a <br /> prevalence of vegetation typically adapted for life in saturated soil conditions". Three general <br /> environmental parameters define a wetland. These parameters consist of the presence of <br /> hydrophytic vegetation, hydric soils, and wetland hydrology. Areas that do not meet any one of <br /> the wetland parameters (hydrophytic vegetation, hydric soils and/or wetland hydrology) were <br /> classified as a non-wetland and mapped as such. In addition, waters of the U.S. are defined as <br /> areas that "include essentially all surface waters such as rivers, streams and their tributaries, all <br /> wetlands adjacent to these waters, and all ponds, lakes and reservoirs". Waters of the U.S. are <br /> further defined by the ordinary high water mark(OHWM). The OHWM is characterized as"the <br /> line on the shores established by the fluctuations of water and indicated by physical <br /> characteristics such as: a clear natural line impressed on the bank, shelving, changes in the <br /> character of the soil, wetland vegetation, the presence of litter and debris, and other appropriate <br /> 3 <br />