O30 Princeton Hydro Report Dated 9 3 25

PB-24-01 West Essex Highlands, Inc. Block No. 179, Lot No.32, West Orange Township, Essex County, New Jersey September 2025 The relocation of the sanitary sewer out of a proposed stormwater management feature represents the only instance where CME as the municipal engineer is requiring the applicant to revise the plans, while they chose to defer to the NJDEP in all other instances. As stated in our original letter, this design feature is inconsistent with sound engineering practices. Although CME did not appear to take issue with this design flaw in their latest review letter, CME has a responsibility to provide an explanation why they chose to defer to the NJDEP on multiple critical design issues (Time of Concentration methodology/analysis and groundwater mounding) and why they chose not to defer on this issue. It is also important for the public to see a revised plan to understand how the applicant contemplates addressing this issue and how a modified design would achieve compliance with the Township's ordinance while also satisfying NJDEP freshwater wetland and flood hazard area regulations. We appreciate the opportunity to provide you with these engineering services for you. Please do not hesitate to contact us with any questions regarding this review. Sincerely ACA <t Sean Walsh, PE Clay Emfrson PhD PE CFM Senior Project Manager Senior Téchnical Director Attachment: Princeton Hydro April 29, 2025 Letter to NJDEP Princeton Hydro, LLC: 2151.002 a