2025 12 19 Stormwater Report Rev 1

TABLE OF CONTENTS Introduction ..................................................................................................................................... 3 Proposed Improvements.................................................................................................................. 3 Methodology ................................................................................................................................... 4 Existing Conditions......................................................................................................................... 5 Drainage area 1 (DA-1) .............................................................................................................. 5 Drainage area 2 (DA-2) .............................................................................................................. 5 Curve Numbers ........................................................................................................................... 5 Peak Flows .................................................................................................................................. 5 Proposed Conditions ....................................................................................................................... 6 Drainage area 1 (DA-1) .............................................................................................................. 6 Drainage area 2 (DA-2) .............................................................................................................. 6 Curve Numbers ........................................................................................................................... 7 Peak Flows .................................................................................................................................. 7 Water Quality .................................................................................................................................. 8 Groundwater Recharge ................................................................................................................... 8 Storm Sewer Computations ............................................................................................................ 8 Conclusion

................................................... 8 Storm Sewer Computations ............................................................................................................ 8 Conclusion ...................................................................................................................................... 9 Existing Conditions Hydrographs Proposed Conditions Hydrographs Appendix - Web Soil Survey - Essex County Soils Information - New Jersey 24 Hour Rainfall Frequency Data - Table 2-2a Runoff Curve Numbers for Urban Data - Figure 10-B Rainfall Intensity – Duration Frequency Curve – Northern Region - Table 7 – DA-1 Existing Vs. Proposed Runoff Rates – Current Adjusted Rainfall - Table 8 – DA-2 Existing Vs. Proposed Runoff Rates – Current Adjusted Rainfall - Table 9 – DA-1 Existing Vs. Proposed Runoff Rates – Future Projected Rainfall - Table 10 – DA-2 Existing Vs. Proposed Runoff Rates – Future Projected Rainfall - Time of Concentration Calculations - Storm Sewer Calculations - Drainage Area Maps (Fig.-1 – Fig.-3) 2