2025 02 Drainage Statement Signed

I. Introduction This Drainage Statement has been prepared to define and analyze the stormwater drainage conditions that would occur as a result of the improvements to Block 153, Lot 38, as shown on the Township of West Orange Tax Map Sheet No. 84, located in the Township of West Orange, Essex County, New Jersey. In existing conditions, the subject site consists of 1.05 acres (45,713 SF) and is located at 470 Eagle Rock Avenue. Under existing conditions, the site is developed as a restaurant with associated parking, landscaping, and lighting. The existing development has an impervious coverage of approximately 80.9% (36,974 SF) and is located in the B-2 – General Business Zone. The proposed development consists of retrofitting the existing building for the occupancy of a 2,391 SF Popeyes restaurant with a drive-thru and a 3,797 SF IHOP restaurant. Additional site improvements include parking, landscaping, lighting, and a trash enclosure. The proposed development will provide on-site impervious coverage of approximately 75.7% (34,591 SF), resulting in an approximately 2,383 SF (5.2%) reduction. In addition, the project will result in a decrease in motor vehicle surface area of approximately 2,289 SF from 28,325 SF to 26,036 SF. Per the Natural Resources Conservation Service Web Soil Survey, a portion of the property is located within unclassified Urban Land soil. To be conservative, the analysis utilized HSG B in existing conditions and HSG D in proposed for disturbed areas within the Urban Land soil. Based upon the fact that the proposed improvements will result in more than one (1) acre of land disturbance, this project is classified as a “major development” and is subject to compliance with the Stormwater Regulations set forth in NJAC 7:8. However, the project will result in a decrease in motor vehicle surface area and impervious coverage from existing to proposed conditions. As such, the project does not increase regulated motor vehicle surface by more than one-quarter acre and is therefore not required to meet the stormwater runoff quality standards under NJAC 7:8-5.5 and Township of West Orange Ordinance §25-29.4.q. A hydrological evaluation is provided for the 2-, 10-, and 100-year storm events utilizing the Urban Hydrology for Small Watersheds TR55 Method to confirm compliance with the stormwater runoff quantity and groundwater recharge

is provided for the 2-, 10-, and 100-year storm events utilizing the Urban Hydrology for Small Watersheds TR55 Method to confirm compliance with the stormwater runoff quantity and groundwater recharge standards set forth by the Township of West Orange Land Development Ordinance and NJAC 7:8. Based upon the Essex County Soil Survey, the soil types native to the site include: Soil Type Soil Type Name Hydrologic Soil Group BouC Boonton – Urban Land C URBONB Urban Land --* *Please note the NRCS Web Soil Survey did not have a hydrologic soil group rating for the Urban Land portion of the site. Therefore, per NJ BMP Manual Chapter 12 Subsection 1b – Table 12-1, hydrologic soil group B was assumed in the existing condition and hydrologic soil group D was assumed for the increase in pervious surface in the proposed condition. HSG B was maintained from the existing to proposed condition for all other onsite areas. MPB Realty, LLC June 2024 DEC# 1021-99-025 3 Last Revised February 2025