Exhibit O6 2151002Princeton Hydro West Essex Stormwater Comments 202401115

Stormwater Management and Freshwater Wetlands Review West Highlands, Inc. Block No. 179, Lot No.32, West Orange Township, Essex County, New Jersey November 2024 Princeton Hydro, LLC: 0683.022 4 patterns from the existing conditions. Under the existing conditions, the stormwater runoff sheet flows evenly from the site to the existing wetlands. This flow of water helps to hydraulically support the conditions of the wetland. The proposed improvements will collect and convey the stormwater runoff through the stormwater system and the runoff will be discharged much further downstream. The current design does not replicate the existing groundwater hydraulics in either magnitude or pattern, and the recharge that it does offer concentrates the groundwater recharge much further downstream in the watershed. The proposed development will greatly reduce the amount of stormwater that is discharged (via overland flow and through the groundwater) to the upstream portions of the existing onsite wetlands, as demonstrated in Figure 1. This reduction of received stormwater runoff would cause permanent damage to the wetlands. Figure 1: Proposed Grading Plan with Blue Arrows showing the existing drainage path and the red arrows showing the proposed drainage paths and how the runoff is being diverted from the wetlands. 2.3 PEAK FLOW RATE CONTROL (WATER QUANTITY) Based on our review, the application fails to meet the rules outlined in N.J.A.C. 7:8-5.6 with respect to peak flow rate control. First, the design engineer has designed most of the BMPs using exfiltration during the storm to demonstrate compliance with this standard. Chapter 5 of the BMP Manual explicitly