2025 02 Drainage Statement Signed

II. Existing Drainage Conditions In existing conditions, a majority of the stormwater runoff from the area to be disturbed is conveyed via overland flow to the proposed onsite inlets which connect to the existing stormwater infrastructure within Rosney Terrace. Stormwater runoff from Rosney Terrace ultimately discharges into the existing stormwater infrastructure within Eagle Rock Avenue. The remaining stormwater runoff from the site discharges directly to the existing inlet along Eagle Rock Avenue via overland flow. As such, one point of analysis can be considered for the overall development. III. Proposed Drainage Conditions In proposed conditions, stormwater runoff from the project area has been designed to maintain existing drainage patterns. The project proposes to remove the existing onsite inlets and provide ten (10) new inlets within the site to assist in collecting stormwater runoff. The proposed inlets are connected via an underground conveyance system consisting of 12” and 15” reinforced concrete pipes discharging to the existing inlet within Rosney Terrace. Stormwater runoff from the building roof is collected and conveyed underground via 6” PVC roof leaders to the proposed inlets. IV. Runoff Rate Reduction Performance Due to the reduction in impervious coverage, the volume and peak discharge runoff rates for the 2-, 10- & 100-year design storms have been reduced. As such, there shall be no adverse impacts to the properties located upstream and downstream of the site. Study Area Site Design Storm Ex. Peak Flow (cfs) Prop. Peak Flow (cfs) 2 3.22 3.17 10 5.16 5.12 100 9.01 8.97 Per NJAC 7:8-5.6(b).1, the stormwater runoff quantity requirements are met through demonstration that the post-construction runoff hydrographs for the 2, 10- and 100-year storm events do not exceed at any point in time, the pre-construction runoff hydrographs for the same storm events. Appended are the superimposed hydrographs for reference. V. Groundwater Recharge Per NJAC 7:8-5.4(b).2, the project is not subject to the groundwater recharge requirement as it is within the Metropolitan

the superimposed hydrographs for reference. V. Groundwater Recharge Per NJAC 7:8-5.4(b).2, the project is not subject to the groundwater recharge requirement as it is within the Metropolitan Planning Area (PA1) which is classified as an Urban Redevelopment Area. MPB Realty, LLC June 2024 DEC# 1021-99-025 4 Last Revised February 2025