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<br />New Thornton Plant Section 404 Permit <br />• sources of water that will maintain the hydrologic character of the wetland replacement <br />site <br />• typical details of diversion channels <br />• construction supervision intervals <br />TABLE 2 <br />DISTURBED AND MITIGATED WETLANDS <br />Wetland Function Before After <br />Groundwater Rechazge low med <br />Groundwater Dischazge low low <br />Flood Attenuation low med <br />Sediment Stabilization high high <br />Sediment Retention high high <br />Nutrient Removal low low <br />Nutrient Retention med med <br />Production Export low low <br />Wildlife Abundance high high <br />Wildlife Breeding high high <br />Wildlife Migration high high <br />Wildlife Wintering high high <br />Aquatic Abundance low med <br />Recreation low med <br />Uniqueness med med <br />B. Mitigation Site Description <br />All wetland areas impacted will be mitigated on site and in two phases. Phase One is located <br />just south of ] 04~' Avenue and just east of the South Platte River. This phase of mitigation will <br />be completed during the first year of the project and will include 6.86 acres of wetland creation <br />(Drawing 3). In order to provide wetland hydrology, the topsoil of the area will be removed and <br />the area will be excavated just below the water table. Once the proper depth is reached, the <br />topsoil will be replaced to bring the soil surface to the water table and the area will be planted <br />and monitored. <br />Phase Two of the mitigation plan is located just north of 100th Avenue and east of the South <br />Platte River and will be a remnant of the excavation of Area Two (Drawing 3). The site will <br />begin as an open water azea 30 feet deep and encompassing approximately 19.85 acres. Over <br />five yeazs, CAMAS Colorado Inc. will systematically fill the azea from the south with fine <br />particulate from the gravel washing operation. During the growing season of yeaz five, fill will <br />have begun to reach the water table surface in areas (3-5 feet below the original soil surface) and <br />planting will begin. <br />Sections 16, 17 and 9, Township 2 South, Range 67 West, Latitude 39° 53' I S", Longitude 104° 53' S0", /? <br />UTM s~g»omE .,14eoomN, Permanent Disturbance = 24.1 acres <br />