12 2026 02 12 Crestmont CC Stormwater Management Report

3.3.4 Design Summary No groundwater recharge is proposed in the post-construction condition, which mirrors existing conditions in the area of redevelopment due to the presence of HSG D soils. 3.4 Non-Structural Stormwater Management Strategies Nonstructural strategies were analyzed and implemented to the maximum extent practical for this project. As per NJAC 7:8-5.3(b), there are nine nonstructural strategies: 1. Protect areas that provide water quality or are susceptible to erosion; 2. Minimize, break up and/or disconnect impervious surfaces; 3. Maximize protection of natural drainage features and vegetation; 4. Minimize decrease in time of concentration; 5. Minimize land disturbance, clearing and grading; 6. Minimize soil compaction; 7. Provide low maintenance vegetation; 8. Provide vegetated conveyance systems; and, 9. Provide pollutant source controls. Retaining walls are proposed within the redevelopment area in order to maximize the protection of existing steep slopes, trees, and underlying vegetation. Drainage swales are provided as a vegetated conveyance system in order to minimize the decrease in time of concentration. Native and drought tolerant plant species are proposed to the maximum extent feasible in order to provide low maintenance vegetation and stabilization. Areas susceptible to erosion are proposed to be lined with vegetated turf reinforcement matting, and outfalls are proposed to be stabilized with riprap aprons. Soil compaction within proposed vegetated areas will be minimized by providing decompaction measures as required by the soil conservation district. 3.5 Stormwater Conveyance Design 3.5.1 Design Criteria The on-site subsurface collection and conveyance system is designed to convey the 25-year design storm event. The proposed drainage swales were also analyzed for capacity and stability. The proposed drainage swale design is governed by the standards outlined within the NJDOT Roadway Design Manual and the Standards for Soil Erosion and Sediment Control in New Jersey. The NJDOT 19