05 Stormwater Statementrcd 10 14 24

onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha-Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an

in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. Custom Soil Resource Report 9

Essex County, New Jersey USBOOB—Urban land, Boonton substratum - Boonton complex, red sandstone lowland, 0 to 8 percent slopes Map Unit Setting National map unit symbol: w9c3 Elevation: 0 to 560 feet Mean annual precipitation: 30 to 64 inches Mean annual air temperature: 46 to 79 degrees F Frost-free period: 131 to 178 days Farmland classification: Not prime farmland Map Unit Composition Urban land, boonton red sandstone lowland substratum: 60 percent Boonton, red sandstone lowland, and similar soils: 30 percent Minor components: 10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Urban Land, Boonton Red Sandstone Lowland Substratum Setting Landform: Ground moraines Landform position (three-dimensional): Lower third of mountainflank Down-slope shape: Linear Across-slope shape: Linear Parent material: Surface covered by pavement, concrete, buildings, and other structures underlain by disturbed and natural soil material Typical profile H1 - 0 to 12 inches: material H2 - 12 to 67 inches: gravelly loam 2CB - 67 to 83 inches: gravelly sandy loam Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 8s Hydric soil rating: Unranked Description of Boonton, Red Sandstone Lowland Setting Landform: Ground moraines Down-slope shape: Convex Across-slope shape: Linear Parent material: Coarse-loamy till derived from sandstone and shale Typical profile Oi - 0 to 1 inches: slightly decomposed plant material A - 1 to 3 inches: silt loam BE - 3 to 10 inches: loam Bw - 10 to 27 inches: gravelly loam Bx1 - 27 to 40 inches: gravelly fine sandy loam Bx2 - 40 to 67 inches: gravelly fine sandy loam BCx - 67 to 83 inches: gravelly sandy loam Custom Soil Resource Report 10

Properties and qualities Slope: 3 to 8 percent Depth to restrictive feature: 20 to 36 inches to fragipan Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water capacity: Low (about 4.8 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: C Ecological site: F144AY037MA - Moist Dense Till Uplands Hydric soil rating: No Minor Components Udorthents, boonton red sandstone lowland substratum Percent of map unit: 10 percent Landform: Ground moraines Landform position (three-dimensional): Lower third of mountainflank Down-slope shape: Convex Across-slope shape: Linear Hydric soil rating: No Custom Soil Resource Report 11

Stormwater Management Statement Proposed Site Improvements Township of West Orange, New Jersey October 8, 2024 APPENDIX C-1 • HYDROCAD ROUTING DIAGRAM • 2-YEAR HYDROGRAPHS • 10-YEAR HYDROGRAPHS • 100-YEAR HYDROGRAPH • 2-YEAR, 10 YEAR, 25 YEAR &100-YEAR COMPARISON HYDROGRAPHS

E-1 Existing Drainage to Franklin Avenue Municipal System P-1 Proposed Drainage to Franklin Avenue Municipal System Routing Diagram for 2024-10-08_HydroCAD Calcs Prepared by Stonefield Engineering & Design, Printed 10/8/2024 HydroCAD® 10.20-5a s/n 10626 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link

NOAA 24-hr D 2-Year Rainfall=3.44"2024-10-08_HydroCAD Calcs Printed 10/8/2024Prepared by Stonefield Engineering & Design Page 2HydroCAD® 10.20-5a s/n 10626 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment E-1: Existing Drainage to Franklin Avenue Municipal System Runoff = 0.68 cfs @ 12.13 hrs, Volume= 2,425 cf, Depth= 2.91" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.02 hrs NOAA 24-hr D 2-Year Rainfall=3.44" Area (sf) CN Description * 8,524 98 Impervious Area 1,476 74 >75% Grass cover, Good, HSG C 10,000 94 Weighted Average 1,476 74 14.76% Pervious Area 8,524 98 85.24% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum ToC Subcatchment E-1: Existing Drainage to Franklin Avenue Municipal System Runoff Hydrograph Time (hours) 727068666462605856545250484644424038363432302826242220181614121086420 Flow (cfs) 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=10,000 sf Runoff Volume=2,425 cf Runoff Depth=2.91" Tc=6.0 min CN=74/98 0.68 cfs

NOAA 24-hr D 2-Year Rainfall=3.44"2024-10-08_HydroCAD Calcs Printed 10/8/2024Prepared by Stonefield Engineering & Design Page 3HydroCAD® 10.20-5a s/n 10626 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment E-1: Existing Drainage to Franklin Avenue Municipal System Time (hours) Precip. (inches) Perv.Excess (inches) Imp.Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.20 0.01 0.00 0.00 0.00 0.40 0.02 0.00 0.00 0.00 0.60 0.02 0.00 0.00 0.00 0.80 0.03 0.00 0.00 0.00 1.00 0.04 0.00 0.00 0.00 1.20 0.05 0.00 0.00 0.00 1.40 0.06 0.00 0.00 0.00 1.60 0.06 0.00 0.00 0.00 1.80 0.07 0.00 0.00 0.00 2.00 0.08 0.00 0.01 0.00 2.20 0.09 0.00 0.01 0.00 2.40 0.10 0.00 0.01 0.00 2.60 0.11 0.00 0.02 0.00 2.80 0.12 0.00 0.02 0.00 3.00 0.13 0.00 0.03 0.00 3.20 0.14 0.00 0.03 0.01 3.40 0.15 0.00 0.04 0.01 3.60 0.16 0.00 0.04 0.01 3.80 0.17 0.00 0.05 0.01 4.00 0.18 0.00 0.06 0.01 4.20 0.19 0.00 0.06 0.01 4.40 0.20 0.00 0.07 0.01 4.60 0.21 0.00 0.08 0.01 4.80 0.22 0.00 0.09 0.01 5.00 0.24 0.00 0.09 0.01 5.20 0.25 0.00 0.10 0.01 5.40 0.26 0.00 0.11 0.01 5.60 0.27 0.00 0.12 0.01 5.80 0.28 0.00 0.13 0.01 6.00 0.29 0.00 0.14 0.01 6.20 0.31 0.00 0.15 0.01 6.40 0.32 0.00 0.16 0.01 6.60 0.33 0.00 0.17 0.01 6.80 0.35 0.00 0.18 0.01 7.00 0.36 0.00 0.20 0.01 7.20 0.38 0.00 0.21 0.01 7.40 0.39 0.00 0.22 0.01 7.60 0.41 0.00 0.24 0.01 7.80 0.43 0.00 0.25 0.02 8.00 0.45 0.00 0.27 0.02 8.20 0.47 0.00 0.29 0.02 8.40 0.48 0.00 0.30 0.02 8.60 0.50 0.00 0.32 0.02 8.80 0.52 0.00 0.34 0.02 9.00 0.55 0.00 0.36 0.02 9.20 0.57 0.00 0.38 0.02 9.40 0.59 0.00 0.40 0.02 9.60 0.62 0.00 0.43 0.03 9.80 0.65 0.00 0.46 0.03 10.00 0.68 0.00 0.49 0.03 10.20 0.72 0.00 0.52 0.03

NOAA 24-hr D 2-Year Rainfall=3.44"2024-10-08_HydroCAD Calcs Printed 10/8/2024Prepared by Stonefield Engineering & Design Page 4HydroCAD® 10.20-5a s/n 10626 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment E-1: Existing Drainage to Franklin Avenue Municipal System (continued) Time (hours) Precip. (inches) Perv.Excess (inches) Imp.Excess (inches) Runoff (cfs) 10.40 0.75 0.00 0.55 0.03 10.60 0.79 0.00 0.59 0.04 10.80 0.84 0.01 0.64 0.05 11.00 0.89 0.01 0.69 0.05 11.20 0.96 0.02 0.75 0.07 11.40 1.04 0.03 0.83 0.08 11.60 1.15 0.05 0.94 0.11 11.80 1.31 0.09 1.09 0.16 12.00 1.65 0.20 1.43 0.37 12.20 2.13 0.41 1.91 0.43 12.40 2.29 0.49 2.06 0.16 12.60 2.40 0.55 2.17 0.11 12.80 2.48 0.60 2.25 0.09 13.00 2.55 0.63 2.32 0.07 13.20 2.60 0.67 2.37 0.06 13.40 2.65 0.69 2.42 0.05 13.60 2.69 0.72 2.46 0.04 13.80 2.72 0.74 2.49 0.04 14.00 2.76 0.76 2.53 0.04 14.20 2.79 0.78 2.56 0.03 14.40 2.82 0.80 2.59 0.03 14.60 2.85 0.81 2.62 0.03 14.80 2.87 0.83 2.64 0.03 15.00 2.89 0.84 2.66 0.02 15.20 2.92 0.85 2.68 0.02 15.40 2.94 0.87 2.70 0.02 15.60 2.96 0.88 2.72 0.02 15.80 2.97 0.89 2.74 0.02 16.00 2.99 0.90 2.76 0.02 16.20 3.01 0.92 2.78 0.02 16.40 3.03 0.93 2.80 0.02 16.60 3.05 0.94 2.81 0.02 16.80 3.06 0.95 2.83 0.02 17.00 3.08 0.96 2.85 0.02 17.20 3.09 0.97 2.86 0.02 17.40 3.11 0.98 2.87 0.02 17.60 3.12 0.99 2.89 0.01 17.80 3.13 0.99 2.90 0.01 18.00 3.15 1.00 2.91 0.01 18.20 3.16 1.01 2.93 0.01 18.40 3.17 1.02 2.94 0.01 18.60 3.18 1.03 2.95 0.01 18.80 3.19 1.03 2.96 0.01 19.00 3.20 1.04 2.97 0.01 19.20 3.22 1.05 2.98 0.01 19.40 3.23 1.06 2.99 0.01 19.60 3.24 1.06 3.01 0.01 19.80 3.25 1.07 3.02 0.01 20.00 3.26 1.08 3.03 0.01 20.20 3.27 1.08 3.04 0.01 20.40 3.28 1.09 3.05 0.01 20.60 3.29 1.10 3.06 0.01

NOAA 24-hr D 2-Year Rainfall=3.44"2024-10-08_HydroCAD Calcs Printed 10/8/2024Prepared by Stonefield Engineering & Design Page 5HydroCAD® 10.20-5a s/n 10626 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment E-1: Existing Drainage to Franklin Avenue Municipal System (continued) Time (hours) Precip. (inches) Perv.Excess (inches) Imp.Excess (inches) Runoff (cfs) 20.80 3.30 1.10 3.07 0.01 21.00 3.31 1.11 3.08 0.01 21.20 3.32 1.12 3.09 0.01 21.40 3.33 1.12 3.10 0.01 21.60 3.34 1.13 3.11 0.01 21.80 3.35 1.14 3.12 0.01 22.00 3.36 1.14 3.12 0.01 22.20 3.37 1.15 3.13 0.01 22.40 3.38 1.15 3.14 0.01 22.60 3.38 1.16 3.15 0.01 22.80 3.39 1.17 3.16 0.01 23.00 3.40 1.17 3.17 0.01 23.20 3.41 1.18 3.18 0.01 23.40 3.42 1.18 3.18 0.01 23.60 3.42 1.19 3.19 0.01 23.80 3.43 1.19 3.20 0.01 24.00 3.44 1.20 3.21 0.01 24.20 3.44 1.20 3.21 0.00 24.40 3.44 1.20 3.21 0.00 24.60 3.44 1.20 3.21 0.00 24.80 3.44 1.20 3.21 0.00 25.00 3.44 1.20 3.21 0.00 25.20 3.44 1.20 3.21 0.00 25.40 3.44 1.20 3.21 0.00 25.60 3.44 1.20 3.21 0.00 25.80 3.44 1.20 3.21 0.00 26.00 3.44 1.20 3.21 0.00 26.20 3.44 1.20 3.21 0.00 26.40 3.44 1.20 3.21 0.00 26.60 3.44 1.20 3.21 0.00 26.80 3.44 1.20 3.21 0.00 27.00 3.44 1.20 3.21 0.00 27.20 3.44 1.20 3.21 0.00 27.40 3.44 1.20 3.21 0.00 27.60 3.44 1.20 3.21 0.00 27.80 3.44 1.20 3.21 0.00 28.00 3.44 1.20 3.21 0.00 28.20 3.44 1.20 3.21 0.00 28.40 3.44 1.20 3.21 0.00 28.60 3.44 1.20 3.21 0.00 28.80 3.44 1.20 3.21 0.00 29.00 3.44 1.20 3.21 0.00 29.20 3.44 1.20 3.21 0.00 29.40 3.44 1.20 3.21 0.00 29.60 3.44 1.20 3.21 0.00 29.80 3.44 1.20 3.21 0.00 30.00 3.44 1.20 3.21 0.00 30.20 3.44 1.20 3.21 0.00 30.40 3.44 1.20 3.21 0.00 30.60 3.44 1.20 3.21 0.00 30.80 3.44 1.20 3.21 0.00 31.00 3.44 1.20 3.21 0.00