2022 08 Drainage Report

I. SITE DESCRIPTION The subject site is located at 2 & 10 Ridge Road in the Township of West Orange, Essex County, New Jersey. The site is identified as Block 80.03, Lot 21 & 10 on the Township of West Orange Tax Map Sheet #32. The subject site is currently undeveloped with overgrown wooded areas. The existing conditions of the site have been verified by the ALTA/NSPS Land Title Survey as prepared by Dynamic Survey, LLC, dated 05/11/2022. The scope of the study includes the proposed which consists of subdividing into four total lots and developing each parcel with four new single-family houses with a prototypical footprint size of 40’x60’ totaling approximately 9,600 SF with accompanying driveways. II. DESIGN OVERVIEW 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 into four subdivided lots with four new single-family residential houses on Block 80.03, Lots 21 & 10 in the Township of West Orange, Essex County, New Jersey. The scope of the study includes the proposed which consists of subdividing into four total lots and developing each parcel with four new single-family houses with assumed footprint sizes totaling approximately 9,600 SF (2,400 SF each) with accompanying driveways as well as stormwater management facilities as shown on the accompanying engineering drawings. Based upon the fact that the proposed development will result in more than one (1) acre of land disturbance, this project is classified as a “major development”. Therefore, the proposed development has been designed to meet the stormwater runoff quantity, quality, and groundwater recharge standards, set forth by the Township of West Orange Land Use Ordinance and NJAC 7:8. Accordingly, the following items are addressed within this report: Groundwater recharge standards (7:8-5.4) Stormwater runoff quality standards (7:8-5.5) Stormwater runoff quantity standards (7:8-5.6) Calculation of stormwater runoff and groundwater recharge (7:8-5.7) A hydrological evaluation is provided for the NJDEP Water Quality, 2, 10, 25, and 100-year storm events utilizing the Urban Hydrology for Small Watershed TR55 method. SHI Builders August 2022 DEC# 4266-99-001 -1-