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HomeMy WebLinkAboutDIAMOND SHAMROCK CORNER STORE #1100 PUD - FINAL - 14-89A - SUBMITTAL DOCUMENTS - ROUND 1 - WETLANDS DOCUMENTS51 GEFROH HATTMAN INC. ARCHITECTS/PLANNERS CONSTRUCTION MANAGEMENT 135 West Swallow Road Fort Collins, CO 80525 (303) 223-7335 INTRODUCTION The proposed Nelson Pond Wetland and Wildlife Habitat is an off -site mit- igation for a 1.3 acre wetland located approximately 1000 feet south of the Nelson Pond site. The overall design provides for diversified wet- land, shoreline and aquatic habitats. Information provided there is in- tended to describe the overall design for the Nelson Pond and its wild- life habitat zones. GOALS AND OBJECTIVES 1. Enhance and upgrade an existing stormwater detention facility which is located within a residential development. 2. Create a pond, wetland and wildlife habitat by enlarging the existing stream channel and through appropriate landscape planting for a ri- parian environment. 3. Establish a diverse riparian habitat complete with aquatic, shore- line and wetland plant material which will attract a variety of wild- life to the area. 4. Reduce the existing insect breeding habitat where possible. 5. Preserve and enhance the recreational value of the existing site. EXISTING CONDITIONS Presently, Nelson Pond is an approximately 8-acre storm drainage deten- tion facility serving that section of Fort Collins' storm drainage basin network. It functions as a 100-year flood facility. The overall visual quality of the pond is poor due to its lack of tail vegetation (shade trees), expansive landscape character and abundant weed population. Ex- isting vegetation includes an assortment of weeds combined with native grasses. The soil is poorly drained and according to adjacent homeowners, low lying areas along the stream are in a saturated condition throughout the growing season. These areas provide an ideal breeding environment for insects. A small stream with continuous year around flow bisects the site and trav- els from east to west through the site. Its size is approximately 3` 4' wide during normal flow periods. Depth of the stream varies from several inches during normal flow up to pond capacity during peak flooding. Stream bank/edge is approximately 2 feet in height with a 2:1 bank slope. Three subsurface drainage lines feed the stream with water collected from the adjacent suburban development. The drainage lines daylight at the stream edge. These "outfall" areas are visual eyesores within the detention facility. Recreational use of the existing pond is limited due to the limited main- tenance practices. However, several adjacent property owners mow and maintain large portions of the pond which border their properties for aesthetic and recreational purposes. Neighborhood children generally use the area for informal play. DESIGN SUMMARY The proposed design for Nelson Pond replaces more than the required 1.3 acre wetland mitigation. The aesthetic quality of the area will be im- proved through the establishment of pond, wetland and shade tree plant- ings. Wildlife value will be increased by introducing aquatic, shoreline shrub/thicket and tree plantings. These plantings will provide food and cover for a variety of waterfowl, game birds, song birds and small animals. Open recreational areas will be retained for informal play. However, large tree and shrub plantings will be located along the stream and pond edges to visually buffer storm drainage outfall areas, enhance views into the area and break up the expansive character of the existing detention pond. The pond and wetland have been designed with the following considerations: Both pond and wetland are to be linear in character, with an area of ap- proximately 2.5 acres. The elongated pond design has been developed to maximize water movement along pond edges. It is assumed that water move- ment in these areas will reduce insect breeding. The maximum depth of the proposed pond will be at 4'-0" with a variety of shoreline/bank slopes which do not exceed 2:1. Along the shoreline, a variety of aquatic spe- cies and moisture tolerant shrubs and trees will be placed. Wetland areas located beyond the pond's shoreline will be graded at a 1-2q slope draining towards the pond. All wetlands are to be located immediately adjacent to the pond. 0 BOTANIC NAME TREES Populus angustifolia Prunus americana Salix amygloides SHRUBS -3- LIST OF PLANTS Aronia melanocarpa Cornus stolonifera Salix irrorata Salix purpurea nana AQUATICS Ceratophyllum demersum Chara kieneri Potamogeton pectinatus Typha angustifolia GRASSES AND FORBS Phalaris arundinacea Aster alpinus Lupinus sp. Lythrum sp. • COMMON NAME Narrow Leaf Cottonwood Wild Goose Plum Peach Tree Willow Black Chokeberry Redtwig Dogwood Blue Stem Willow Dwarf Arctic Willow Coontail Muskgrass Sago Pondweed Cattail Indian Rice Grass Reed Canary Grass Native Aster Native Lupines Lythrum TO: Roger Barringer, Galway and Romero From: Ted Shepard, City of Fort Collins Planning Dept. By Order Of: KenBaca, Diamond Shamrock Project: Diamond Shamrock Corner Store #1100 P,U.D. Fort Collins, CO.