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N. Carry out final grading and seeding and planting. O. Clean storm system following construction. P. Remove silt fencing only after all paving is complete and exposed surfaces are stabilized. Note: Sediment control storage during construction (traps & basins) during construction shall be 134 cy per acre of disturbance per NYSDEC requirements. 112.4 STORM WATER MANAGEMENT The existing site sheet drains from east to west to a USACE jurisdictional wetland area at the rear of the site. The proposed development will replicate the existing hydrology of the site. The proposed hydrology for the development project area will consist of overland sheet flow and pipe channel flow. The storm sewer system for this site will consist of 6”, 8” and 12” HDPE pipes connected by a series of catch basins and yard drains. Stormwater runoff generated from the site will enter the pipe network and be conveyed to a detention basin on the west side of the site. The detention basin will discharge runoff, at a controlled rate, to the existing wetlands. To meet NYSDEC water quality requirements, runoff will be conveyed to a bioretention areas prior to the detention basin. Runoff that is currently being discharged on to the site from the church parking lot to the east will be collected and piped to the west side of the site. The NYSDEC Stormwater Management Design Manual requires a five-step process for Stormwater Management Planning as outlined in Chapter 3. The five steps include: 1. Site planning to preserve natural features and reduce impervious cover. • Approximately 5.6 acres of existing vegetation within the existing wetlands will remain and be protected. 2. Calculation of Water Quality Volume (WQv=RRv) for site. • See Stormwater Drainage Calculations. 3. Incorporation of Green Infrastructure techniques and standard SMPs with Runoff Reduction Volume (RRv) capacity. • Bioretention areas were incorporated into the site design to provide required RRv for the development. See Stormwater Drainage Calculations. 4. Use of standard SMPs where applicable, to treat the portion of water quality volume not addressed by green infrastructure techniques and standard SMPs with RRv capacity. • The bioretention areas serve to the treat the remaining WQv. 5. Design of volume and peak rate control practices where required. • See Stormwater Drainage Calculations. The NYSDEC Stormwater Management Design Manual requires (5) five different criteria be considered when designing a stormwater management system. Those criteria are Water Quality, Runoff Reduction Volume, Channel Protection, Overbank Flooding and Extreme Storm Protection. Below is a summary of each item and how it is incorporated into this project. Multifamily Development 5/26/26 Page 12 of 23 Page 578 of 849