250701_JF_Response Letter

Project No. 24006174A July 1, 2025 Page 4 | 5 4. Grading & Drainage Plan 4.1. The storm water management plan shall be designed and comply with the regulations that were adopted by the West Orange Township Council on May 20, 2025, as Ordinance No. 2918-25. Response: This application was submitted to the Board in 2024 and therefore has been designed to comply with the regulations in place at that time. 4.2. The approval by the West Orange Planning Board for the adjoining parcel at 40 Eagle Ridge Way included some drainage improvements on this parcel. These plans shall reflect these improvements. Response: The drainage improvements at 40 Eagle Ridge Way have been added to the plans. 4.3. The Applicant’s engineer shall explain the reason for offsetting the proposed impervious area by the amount of impervious area and regulated motor vehicle surfaces that existed under the prior use. At the time of this application the remnants of the prior use were removed. Response: While the existing improvements were demolished prior to this application, the demolition was performed as part of the overall project. The existing conditions were considered to be the most recent permanent condition, rather than the current condition as an active site. 4.4. The Applicant’s engineer shall provide results of a geotechnical investigation to ensure the infiltration system meets the requirements of Chapter 12 of the NJ Stormwater Best Management Practices (BMP) Manual. Verification of the depth of bedrock and seasonal high-water table shall be submitted to the Municipal Engineer and confirmed prior to the issuance of a building permit. Test pits shall be made in accordance with NJDEP BMP manual and regulations for groundwater table location. Response: Initial geotechnical investigation was begun in February of 2025. However, a full investigation including infiltration testing has not yet been performed. This testing will be completed prior to final approval. Please refer to the revised Stormwater Management Report for more detailed discussion. 4.5. The Time of Concentration calculations were not provided. Response: TC calculations have been added to the drainage maps. 4.6. Drywell overflow pipe calculations are required for capacity and discharge as well as offsite stability (velocity) as per NJ Soil Erosion and Sediment Control Standards. Response: Offsite stability calculations are

ow pipe calculations are required for capacity and discharge as well as offsite stability (velocity) as per NJ Soil Erosion and Sediment Control Standards. Response: Offsite stability calculations are included in this submission. 4.7. The Engineer shall verify from the manufacturer of the pervious pavers that there is sufficient storage as specified. Response: The pervious pavers are not intended to function as a stormwater management system.