9.13.23 BOA Agenda Packet - Laserfiche WebLink

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07 June 2023 Page 2 161 The Nest at 54 West DEQ Project No.23-0238 3. An effective stormwater management plan should be developed for the site. Incorporate the following elements into erosion and sediment control plans: minimize clearing and grading,protect waterways, phase construction for larger construction sites(>25 acres), stabilize soils as rapidly as possible(<2 weeks),protect steep slopes,establish appropriate perimeter controls,employ advanced settling devices,implement a certified contractors program, and regularly inspect erosion control measures. 4. Non-native plants should not be used for seeding disturbed areas. Specifically,avoid using Bermudagrass,redtop,tall fescue,and lespedeza,which are invasive and/or non-native. A list of alternatives to non-native species has been attached.Alternatively,use a grain, such as oats,wheat, or rye for temporary cover and native seed mixes for permeant seeding. Avoid using invasive,non- native plants in seed mixtures or landscaping plants, such as nandina and privet (hqp://www.ncwildflower.ora/plant_galleries/invasives_list). 5. Erosion control matting made of plastic mesh or twine should not be used within the project area because it can injure or kill wildlife. 6. a)The culvert must be designed to allow for aquatic life and fish passage. Generally,the culvert or pipe invert should be buried at least 1 foot below the natural streambed(measured from the natural thalweg depth). If multiple barrels are required,barrels other than the base flow barrel(s)should be placed on or near stream bankfull or floodplain bench elevation(similar to Lyonsfield design). These should be reconnected to floodplain benches as appropriate. This may be accomplished by utilizing sills on the upstream and downstream ends to restrict or divert flow to the base flow barrel(s). Silled barrels should be filled with sediment so as not to entrap wildlife or support mosquito breeding conditions. Sufficient water depth should be provided in the base flow barrel(s) during low flows to accommodate fish movement. If culverts are longer than 40-50 linear feet, alternating or notched baffles should be installed in a manner that mimics existing stream pattern. This should enhance aquatic life passage: 1)by depositing sediments in the barrel,2)by maintaining channel depth and flow regimes, and 3)by providing resting places for fish and other aquatic organisms. In essence, base flow barrel(s) should provide a continuum of water depth and channel width without substantial modifications of velocity. b) If multiple pipes or cells are used,at least one pipe or box should be designed to remain dry during normal flows to allow for wildlife passage. c) Culverts or pipes should be situated along the existing channel alignment whenever possible to avoid channel realignment. Widening the stream channel must be avoided. Stream channel widening at the inlet or outlet end of structures typically decreases water velocity causing sediment deposition that requires increased maintenance and disrupts aquatic life passage. d) Riprap should not be placed in the active thalweg channel or placed in the streambed in a manner that precludes aquatic life passage. Bioengineering boulders or structures should be professionally designed, sized, and installed. Thank you for the opportunity to provide input in the early planning stages for this project. Please contact me at(336)269-0074 or olivia.munzer(c�r�,ncwildlife.org if there are any questions about these comments or for free technical guidance.