1240815StormWaterManagementReport

C/D Soil map units are labeled (as space allows) for map scales D 1:50,000 or larger. Not rated or not available Date(s) aerial images were photographed: Oct 10, 2022—Oct 16, 2022 Soil Rating Points A The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background A/D imagery displayed on these maps. As a result, some minor B shifting of map unit boundaries may be evident. B/D 5 Natural Resources Web Soil Survey 7/24/2025 Conservation Service National Cooperative Soil Survey

Hydrologic Soil Group—Essex County, New Jersey Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI BouB Boonton - Urban land, C 0.3 86.4% Boonton substratum complex, 0 to 8 percent slopes URBONB Urban land, Boonton 0.1 13.6% substratum, 0 to 8 percent slopes Totals for Area of Interest 0.4 100.0% Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward

transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Natural Resources Web Soil Survey 7/24/2025 Conservation Service National Cooperative Soil Survey 6

HYDROLOGIC ANALYSIS EXISTING & PROPOSED

2 1 Parking Lot 3 Exisiting 4 Pervious Pavers Proposed 5 6 Pipes Bypass 7 Proposed Subcat Reach Pond Link Routing Diagram for 1240815-pipes Prepared by Casey & Keller, Inc, Printed 9/12/2025 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC 8

PLEASANT VALLEY WAY 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Casey & Keller, Inc Printed 9/12/2025 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. UI as Pervious Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1: Exisiting Runoff Area=16,242 sf 68.64% Impervious Runoff Depth=2.60" Flow Length=141' Tc=5.9 min CN=74/98 Runoff=0.98 cfs 0.081 af Subcatchment 2: Parking Lot Runoff Area=7,305 sf 88.61% Impervious Runoff Depth=3.01" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=0.57 cfs 0.042 af Pond 3: Pervious Pavers Peak Elev=414.04' Storage=347 cf Inflow=0.57 cfs 0.042 af Discarded=0.11 cfs 0.042 af Primary=0.00 cfs 0.000 af Outflow=0.11 cfs 0.042 af Subcatchment 4: Proposed Runoff Area=8,332 sf 56.96% Impervious Runoff Depth=2.37" Flow Length=92' Tc=0.9 min CN=74/98 Runoff=0.52 cfs 0.038 af Pond 5: Pipes Peak Elev=412.44' Storage=183 cf Inflow=0.52 cfs 0.038 af Discarded=0.03 cfs 0.024 af Primary=0.41 cfs 0.014 af Outflow=0.44 cfs 0.038 af Subcatchment 6: Bypass Runoff Area=605 sf 0.00% Impervious Runoff Depth=1.22" Flow Length=128' Tc=6.0 min CN=74/0 Runoff=0.02 cfs 0.001 af Link 7: Proposed Inflow=0.43 cfs 0.015 af Primary=0.43 cfs 0.015 af 9

PLEASANT VALLEY WAY 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Casey & Keller, Inc Printed 9/12/2025 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Summary for Subcatchment 1: Exisiting Runoff = 0.98 cfs @ 12.13 hrs, Volume= 0.081 af, Depth= 2.60" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. UI as Pervious, Time Span= 0.00-72.00 hrs, dt= 0.05 NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Area (sf) CN Description * 2,676 98 Buildings * 794 98 Walks/Steps & Patio 7,679 98 Paved parking, HSG C 5,093 74 >75% Grass cover, Good, HSG C 16,242 90 Weighted Average 5,093 74 31.36% Pervious Area 11,149 98 68.64% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.1 66 0.0680 0.27 Sheet Flow, 1 Grass: Short n= 0.150 P2= 3.47" 1.4 21 0.0950 0.24 Sheet Flow, 2 Grass: Short n= 0.150 P2= 3.47" 0.2 13 0.0390 1.24 Sheet Flow, 3 Smooth surfaces n= 0.011 P2= 3.47" 0.1 13 0.0390 4.01 Shallow Concentrated Flow, 4 Paved Kv= 20.3 fps 0.1 28 0.0360 3.85 Shallow Concentrated Flow, 5 Paved Kv= 20.3 fps 5.9 141 Total 10

PLEASANT VALLEY WAY 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Casey & Keller, Inc Printed 9/12/2025 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Subcatchment 1: Exisiting Hydrograph 1 0.98 cfs Runoff NOAA 24-hr D 2-Year-2020 Rainfall=3.47" P2=3.47" Runoff Area=16,242 sf Flow (cfs) Runoff Volume=0.081 af Runoff Depth=2.60" Flow Length=141' Tc=5.9 min CN=74/98 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) 11

PLEASANT VALLEY WAY 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Casey & Keller, Inc Printed 9/12/2025 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Summary for Subcatchment 2: Parking Lot Runoff = 0.57 cfs @ 12.06 hrs, Volume= 0.042 af, Depth= 3.01" Routed to Pond 3 : Pervious Pavers Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. UI as Pervious, Time Span= 0.00-72.00 hrs, dt= 0.05 NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Area (sf) CN Description 6,473 98 Paved parking, HSG C 832 74 >75% Grass cover, Good, HSG C 7,305 95 Weighted Average 832 74 11.39% Pervious Area 6,473 98 88.61% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.1 8 0.0650 1.38 Sheet Flow, 1 Smooth surfaces n= 0.011 P2= 3.47" 0.1 15 0.6700 3.99 Sheet Flow, 2 Smooth surfaces n= 0.011 P2= 3.47" 0.5 59 0.0500 1.86 Sheet Flow, 3 Smooth surfaces n= 0.011 P2= 3.47" 0.2 10 0.0250 0.99 Sheet Flow, 4 Smooth surfaces n= 0.011 P2= 3.47" 0.9 92 Total 12

PLEASANT VALLEY WAY 1240815-pipes NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Casey & Keller, Inc Printed 9/12/2025 HydroCAD® 10.20-7a s/n 03272 © 2025 HydroCAD Software Solutions LLC Subcatchment 2: Parking Lot Hydrograph 0.6 0.57 cfs Runoff 0.55 NOAA 24-hr D 0.5 2-Year-2020 Rainfall=3.47" 0.45 P2=3.47" 0.4 Runoff Area=7,305 sf Flow (cfs) 0.35 Runoff Volume=0.042 af 0.3 Runoff Depth=3.01" 0.25 Flow Length=92' 0.2 Tc=0.9 min 0.15 CN=74/98 0.1 0.05 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) 13