12-12-2005 Council Packet - Laserfiche WebLink

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'ii . 1 ■ • Replace cut bucktboro aieis with appropriate, local ecotype native vegetation. This may include upland shrubs (e.g., wild plum), wetland edge shrubs (e.g., led-twig dogwood), and native grasses and wildflowers. • Plant appropriate, local ecotype native trees, shrubs, grasses, and wildflowers to restore native Maple-Basswood Forest to Outlot B. This would expand the preserved forest to the cast, making a larger block of contiguous canopy cover. W#!tUiwt pTeacfvation • While the quality of the on-site wetland is not hi^, it still has value and performs important ecological services (e.g., infihratioii, evapotranspiration, filtraticn, floodwater storage, etc.). Ba^ on the site plan, some wetbmd imptKts ate proposed below the de mMmys area; therefore, no replacement is proponed. Reoonunendations for wetiuid preservation include: • Blimhuite the fill proposed on the south side of the on-site wetland. • Shill the proposed home on Lot 8 to die north, which should result in less wetland fill. WgtliMt RnhMiMiniwit and PapaiMimi . Hiin to piwir nf ttw» inrirtiup arw opportunities to improve the ecological health of this habitat and enhance its aesthetics. The site's wetlands are situation the western portion ofthe site, near Willow Drive. Enlumcing these locations would provide an attractive amenity ftardie developmoit to be enjoyed by both residents and passers-by. Our recommoidatioiis fin wetland enhancement indude: • Remove all non-native vegetrUhm (e.g., mostly reed canary grass). This should be done using appropriate methods (e.g., using an aquatic-approved herbicide, such as Rodeo). • Seed and/or plant areas where reed canary grass was removed with appropriate, local ecotype native vegetation (e.g., arrowhead, marsh milkweed, golden Alexanders, New England aster, fox sedge, water plantain, river bulrush, wool grass, iris). • Provide wetland replacement in low-lying areas that already require grading for site construction. Seed and/or plant these areas to expand the natural wetland areas on the site. Venetated Bufler EstahhstmMM** - Vegetated buffers con provide many ecological and aesthetic benefits including stormwater managemen t, wildlife habitat, and visual acreenirrg. Generally, the wider the buffer, the greater the benefits. Buffers are portkiilatly important around wetlands for water qrulity protection. Vegetated buffers should be establMied by removing non-native or invasive plant species and re-planting with appropriate, local ecotype perennial native species. Selecting the appropriate species depends on the eoU, moisture regime, amount of sunlight, adjacent vegetatkm, and aesthetic desires. Stormwater Mti—amMit. One of the most important conwrvation opportunities at the site is to provide for ecologically sound stormwater management Stormwater management is important to protect the exiating oo-eUe wetl arwl as well as downetieam receiving waters, including Long and Lake Mhmelooka. Ptolectiooofaquatic resources often requires techniques beyond or in place of sfendard curb and gutter collection syiSeins and stormwater ponds. The propose d plan provides for rw-lot swales to convey runoff into treatment ponds. Reconuneoidations for additioruil stormwater management techniques include: • Minimixe impervious surfeces throughout the developmenL This con be accomplished by using narrower streets and limiting roof, driveway, and other hard surfiKe areas on individual lots. • Employ rain gatdeia or overtypes of infiltration systems where appropriate. This requires a source of water and slopes feat allow fbr gravity flow of runoff into management areas. Management areas preferably have upland soils wife higher infiltratioo rates. These types of soils exist on the she. Rain gardens can be located and designed to intercept arulmaruige runoff from individual lots, reducing fee capacity required by other stormwater management areas on fee site. An infiltratioo fbtebay may be appropriate in Outlot A to provide infiltration opportunities prior to overflowing into fee proposed Mormwater pood. This approach can result in not only smaller tssnsiiiiSBS 3 of 4 OladUeCsw