260205_JF_Zoning Response Letter_42 ERW

Project No. 24006174A February 5, 2026 Page 4 | 7 4.3. Both the pre- and post-development hydro-CAD analysis titles are “Future Rainfall”. The source of the rainfall amounts should be clarified in the report as well as how the future rainfall amounts were calculated. Additionally, a pre- and post-development hydro-CAD analysis for the “Current Rainfall” should also be provided to ensure reductions are met for these storms as well. Response: Per Chapter 5 of the NJDEP BMP Manual, current precipitation adjustment factors for Essex County are as follows: 2-Year 1.01 10-Year 1.03 100-Year 1.06 Per Chapter 5 of the NJDEP BMP Manual, future precipitation adjustment factors for Essex County are as follows: 2-Year 1.19 10-Year 1.22 100-Year 1.33 Therefore, the precipitation depths of the storm events used in calculations are as follows: Rainfall Data – Essex County NJDEP Current Precipitation NJDEP Future Precipitation 2-Year 3.44 3.47 4.09 10-Year 5.22 5.38 6.37 100-Year 8.66 9.18 11.52 A revised Stormwater Management Report including this explanation will be provided. The pre-and-post- development analysis for the “Current Rainfall” is as follows: Description 2 Year Storm 10 Year Storm 100 Year Storm A. Existing Conditions Design Point 1 2.90 cfs 6.29 cfs 13.67 cfs Required Reductions (50%, 75%, 80%) 1.45 cfs 4.72 cfs 10.94 cfs Design Point 2 0.56 cfs 1.25 cfs 2.75 cfs Required Reductions (50%, 75%, 80%) 0.28 cfs 0.94 cfs 2.20 cfs B. Proposed Conditions Design Point 1 1.20 cfs 3.90 cfs 8.65 cfs Design Point 2 0.27 cfs 0.58 cfs 1.23 cfs A revised Stormwater Management Report including this analysis will be provided. 4.4. 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 now reflect these improvements. Response: Statement of fact.