CCP 06-09-2003 - Laserfiche WebLink

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e . . Exhibit A Fernwood Channel Storm Water Improvements Narrative: The City proposes to excavate a basin between Ingerson Road and a point approximately 50 feet upstream of the existing northern bridge across the channel. The basin will have irregularly shaped and gently sloped edges and be four feet deep at its maximum depth. Trees currently growing along the portion of the channel that is to bc developed into the basin and owned by the Association will be removed. However, the basin edges will be planted with a variety of plants, shrubs, trees and aquatic vegetation to provide a natural looking feature. Approximately 40 trees will be planted on the Association's property and will be 2.5" caliper (deciduous) and 6 ft. tall (coniferous) in size. Plants and shrubs will range from 6" to 36" in height. All plant stock will include a two year full replacement warranty from the nursery. The south end of the new basin will have an impermeable weir constructed of earth and boulders that is approximately 30 feet long, 4 feet high, and 5-20 feet in thickness(top to bottom). It will be attractively concealed by the strategic placement of boulders over which the water will flow into the channel during rain events. A new wood chip trail will connect Fernwood Court with the west side ofthe channel. The water level in the basin will be approximately equal to the level of Lake Josephine and will be designed to be "wet" at all times - it is the volume of water in the pond which provides the means to settle out silt etc. before the water spills over the boulders and into the channel. The improvements include the construction of a shallow turfed swale with a French drain underneath (about 2 feet deep) from Ingerson Court across the northern portion of the Association property and draining into the Channel via an unobtrusive outlet below the pond's waterline. The swale will be graded to be easily mowed and will be only 6-12" below the surrounding area. The City guarantees that post construction, all of the Association's land will be returned to its original condition if not better. All construction debris will be removed from the property at the City's expense. The proposed improvements will include vegetation around the perimeter of the basin to discourage children from playing in or near the basin. Slopes around the basin will be graded to be safe slopes (3 horz.: I vert.) to prevent inadvertent slipping etc. around the edge of the basin by children and adults. Many of the slopes around the current channel are eroded and steeper than the proposed slopes. The proposed work in the channel downstream of the basin will also include rounding the edge of the embankment for aesthetics and safety. Access during construction: Once a contractor has been awarded the project, the City Engineer will approve a work schedule for the entire project. Based upon typical projects we would assume that the Contractor would like to begin the grading and excavation work relatively soon in the project (likely by mid July) and will restore the site (seeding/sodding/Landscaping) in late August and September when conditions are better for plant establishment and the remainder of 1