1240815StormWaterManagementReportrcd 3 12 2026

Development Engineering, LLC 550 Colfax Road Wayne, NJ 07470 (973) 835-0340 The variability of soil permeability test results shall be considered acceptable only where the results of all replicate tests fall within one soil permeability class or two adjacent permeability classes. New Jersey Storm Water BMP Manual Appendix E defines soil permeability classes as follows: Measured Soil Permeability Greater Permeability than (in/hr) Class 20 K5 6-20 K4 2-6 K3 0.6-2 K2 0.2-0.6 K1 Less than 0.2 K0 Based on the field results, the subject soil permeability class is K3 which is very suitable for installation of the proposed seepage pit. Please contact us if you require additional information or have questions. Sincerely, Development Engineering, LLC Bahman Izadmehr Bahman Izadmehr, PhD, PE NJPE# GE07470 3 8

Hydrologic Soil Group—Essex County, New Jersey 74° 15' 40'' W 74° 15' 36'' W 562310 562320 562330 562340 562350 562360 562370 562380 562390 40° 48' 31'' N 40° 48' 31'' N 4517780 4517780 4517770 4517770 4517760 4517760 4517750 4517750 4517740 4517740 4517730 4517730 Soil

4517730 Soil Map may not be valid at this scale. 40° 48' 29'' N 40° 48' 29'' N 562310 562320 562330 562340 562350 562360 562370 562380 562390 Map Scale: 1:424 if printed on A landscape (11" x 8.5") sheet. Meters 74° 15' 40'' W 74° 15' 36'' W N 9 0 5 10 20 30 Feet 0 20 40 80 120 Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 18N WGS84 Natural Resources Web Soil Survey 7/24/2025 Conservation Service National Cooperative Soil Survey

Hydrologic Soil Group—Essex County, New Jersey MAP LEGEND MAP INFORMATION Area of Interest (AOI) C The soil surveys that comprise your AOI were mapped at Area of Interest (AOI) 1:12,000. C/D Soils Warning: Soil Map may not be valid at this scale. D Soil Rating Polygons Not rated or not available Enlargement of maps beyond the scale of mapping can cause A misunderstanding of the detail of mapping and accuracy of soil A/D Water Features line placement. The maps do not show the small areas of Streams and Canals contrasting soils that could have been shown at a more detailed B scale. Transportation B/D Rails Please rely on the bar scale on each map sheet for map C measurements. Interstate Highways C/D Source of Map: Natural Resources Conservation Service US Routes

Source of Map: Natural Resources Conservation Service US Routes D Web Soil Survey URL: Major Roads Coordinate System: Web Mercator (EPSG:3857) Not rated or not available Local Roads Maps from the Web Soil Survey are based on the Web Mercator Soil Rating Lines projection, which preserves direction and shape but distorts Background A distance and area. A projection that preserves area, such as the Aerial Photography Albers equal-area conic projection, should be used if more A/D accurate calculations of distance or area are required. B This product is generated from the USDA-NRCS certified data as B/D of the version date(s) listed below. C Soil Survey Area: Essex County, New Jersey Survey Area Data: Version 20, Sep 3, 2024 C/D Soil map units are labeled (as

a: Version 20, Sep 3, 2024 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 10 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 11

IIll WATER QUALITY WATER QUALITY CALCULATIONS CALCULATIONS 12 12

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