2026 05 Storm Water Management Report rcd 5 6 2026

9. Groundwater Recharge Compliance As determined by NJ GeoWeb Mapping, this project area falls within the Metropolitan Planning Area (PA1). Under existing conditions, the site is not covered in woody vegetation nor regrowth. In accordance with New Jersey Standard for Land Grading (revised 2017), non woody vegetated PA1 areas fall under the soil compaction exemption list as an "urban redevelopment" and is defined by NJDEP as "previously developed". Therefore, this project will not be subject to comply with ground water recharge requirements set forth in NJAC 7:8-5.4. 10. Storm Sewer Design The proposed stormwater management collection system has been designed to have hydraulic capacity for the 25-year storm event. The Rational Method was used to determine inflow rates to each structure and Manning’s Equation was used to establish pipe capacity. In accordance with the NJDEP BMP Manual Chapter 5, weighted runoff coefficients were computed for each drainage area based on land cover and hydrologic soil group. A minimum time of concentration of six minutes was assumed for each area. Supporting calculations and the Inlet Drainage Area Map can be found in the appendix. 11. Soil Erosion and Sediment Control Compliance The project has been designed to comply with the Standards for Soil Erosion and Sediment Control in New Jersey. Soil erosion control measures such as a stabilized construction entrance, inlet protection and silt fence are shown on the plans. In addition, the proposed basins and underground stormwater conveyance system discharge to existing stormwater infrastructure located on the site, therefore providing a stable point of discharge. 12. Conclusion The proposed development has been designed with provisions for the safe and efficient control of stormwater runoff in a manner that will not adversely impact the existing drainage patterns, adjacent roadways, or adjacent parcels. In addition, the proposed development satisfies the runoff quality and groundwater recharge requirements set forth by the Township of West Orange Land Use Ordinance and reduces the peak flow rates to the point of analysis to the maximum extent practical and in line with the intent of the regulations through the use of the proposed green infrastructure and underground detention. With this stated, it is evident that the proposed development will not have a negative impact on the

of the regulations through the use of the proposed green infrastructure and underground detention. With this stated, it is evident that the proposed development will not have a negative impact on the existing drainage conditions, water quality or groundwater recharge on-site or within the vicinity of the subject site. Mavis Tire Supply, LLC July 2025 DEC# 1956-24-04187 9 Last revised May 2026