Stormwater Management Report Feb 2026 resubmissionrcd 2 26 2026

1. Site Description & Project Overview This Drainage Statement has been prepared to analyze the stormwater drainage conditions that would occur as a result of the redevelopment of Block 105, Lot 64.01, located in the Township of West Orange, Essex County, New Jersey. The analysis contained within this Drainage Statement is limited to the proposed area of disturbance. According to the Township of West Orange Zoning Map, the site is located in the (B-2) General Business District. The proposed property consists of 0.74 acres (+/-32,118 SF) and is located on Prospect Avenue (County Route #677), West Orange Township. The site is currently developed with an existing realtor’s office consisting of a two (2) story building, parking, sidewalks, lighting and other site amenities. The proposed project will replace the existing 3,338 SF (GFA) building east of Prospect Avenue to be redeveloped with an Automative Service and Retail Center. The proposed building will include a total footprint of approximately 6,205 SF. The overall development will result in approximately 0.04 acres of new impervious surfaces and approximately 0.8 acres of land disturbance. Moreover, the proposed development will reduce existing motor vehicle surfaces by approximately 0.009 acres. Additional site improvements include modifications to the associated parking areas, landscaping, lighting, signage, and utilities as reflected on the accompanying Site Plan drawings. 2. Design Methodology This report has been prepared to define and analyze the stormwater drainage conditions that would occur as a result of the development of the subject site. Based upon the fact that the proposed development will result in more than 0.5 acres of land disturbance, this project is classified as a “major development” as defined in Township of West Orange Land Use Ordinance § 25-29.2. However, based upon the fact that the proposed development will not result in more than one (1) acre of land disturbance, increase impervious coverage by more than ¼ acre, and increase motor vehicle surfaces by more than ¼ acre, this project is not classified as a “major development” as defined in NJAC 7:8. Although not defined as a major development, the proposed development has been designed to meet the stormwater runoff quantity, quality, and groundwater recharge standards, as set forth by the Township of West Orange Land Use

major development, the proposed development has been designed to meet the stormwater runoff quantity, quality, and groundwater recharge standards, as set forth by the Township of West Orange Land Use Ordinance (§ 25-29) and NJAC 7:8. The following documents and data were used in the support of the design of the project: • ALTA/NSPS Land Title Survey, prepared by Dynamic Survey, LLC, dated 12/04/2024, last revised 12/17/2024 • Preliminary & Final Site Plans, prepped by our office, dated 07/16/2025, last revised 02/13/2026 • Test Pit Excavation and Infiltration Testing Report, prepared by ECS, dated 01/29/2025 • NRCS Soil Survey • NJDEP Stormwater Management Best Management Practices Manual Mavis Tire Supply, LLC July 2025 DEC# 1956-24-04187 1 Last revised February 2026