256-25 Proposal FPA - West Orange - MS4 Compliance.pdf

MS4 Mapping Section 1 | Scope of Work French & Parrello Associates, PA (FPA) is pleased to submit this proposal to the Township of West Orange (Township) to provide Professional Engineering and GIS Services for Stormwater System Mapping. In accordance with the New Jersey Department of Environmental Protection’s (NJDEP) New Jersey Pollutant Discharge Elimination System (NJPDES) Tier A General Permit requirements, specifically the Minimum Standards for Mapping and Scouring, and Illicit Discharge Detection Elimination and Watershed Inventory Report, municipalities are required to complete the following: Map the following MS4 infrastructure:          Outfalls Groundwater discharge points System interconnections (to/from) Storm drain inlets including catch basins Manholes Conveyance (piping and ditches) Pump stations Storm water facilities (green infrastructure, manufactured treatment devices, infiltration/detention systems) Property boundaries of maintenance yards and other ancillary operations Additionally, the NJDEP requires municipalities to develop a comprehensive Watershed Improvement Plan that is divided into three phases: an inventory, an assessment, and a final plan. The purpose of the plan is to systematically reduce pollutant loading to all receiving waters within or bordering the municipality that are subject to Total Maximum Daily Loads (TMDLs) or are listed as impaired, to mitigate storm-water flooding, and to integrate water-quality and flood-protection objectives with other regulatory frameworks (e.g., endangered-species, climate resiliency, green infrastructure). The plan must be completed in a phased, publicly-informed manner, with each phase building on the data and priorities established in the previous one. Each Phase and their underlying requirements are briefly detailed as follows: Phase I – Watershed Inventory Report (Due December 31, 2025)  Electronic mapping of all required items using the NJDEP GIS database.  Stormwater outfall data, including outfalls owned and operated by the municipality and an outfall pipe map.  Drainage area delineation for each outfall.  Receiving water bodies for each outfall, along with their water quality classification.  Mapping of stormwater interconnections from the municipality into other entities’ systems, including associated drainage areas.  Inventory of storm drain inlets owned or

ter quality classification.  Mapping of stormwater interconnections from the municipality into other entities’ systems, including associated drainage areas.  Inventory of storm drain inlets owned or operated by the municipality.  Identification of areas affected by TMDLs that lie within or border the municipality.  Identification of areas affected by water quality impairments within or bordering the municipality.  Mapping of overburdened communities and impervious surface areas.  Location and ownership details of all known stormwater outfalls, basins, and infrastructure not owned or operated by the municipality. Phase II – Watershed Assessment Report (Due on or before January 1, 2027)  Assessment of potential watershed conditions by analyzing mapped data to identify water quality impairments and flooding risks. Township of West Orange October 30, 2025 | Page 1