Steep Slopes Report 82625

Cunningham Engineering & Design, LLC Certificate of Authorization No, 24GA28204400 213 Newton Swartswood Road, Newton, New Jersey 07860 973-219-7546 RMCNJPE@YAHOO.COM STEEP SLOPES DISTURBANCE REPORT FOR PROPOSED SITE IMPROVEMENTS BLOCK 152.02, LOTS 176, 179 & 186 TOWNSHIP OF WEST ORANGE ESSEX COUNTY, NEW JERSEY APPLICANT MONTCLAIR STABLES LLC PREPARED BY __________________________________________ ROBERT M. CUNNINGHAM, PE NEW JERSEY LICENSE #GE31540 August 26, 2025

INTRODUCTION This report is submitted in support of an application to the Board of Adjustment of The Township of West Orange for site plan and variance approval. The Applicant, Montclair Stables LLC, has purchased the existing equine facility on Woodland Avenue and proposes to make improvements to the site. The primary improvements are the re-orientation and reconstruction of the existing outdoor sand riding arena and the re-location of the paved parking lot and driveways. The Applicant also proposes to make improvements to Nicholas Avenue; a paper street located at the rear of the property. This facility has used part of Nicholas Avenue as a driveway for decades. The proposed improvements include extending the driveway to connect to the paved portion of Nicholas Avenue near its intersection with Cannon Street. The driveway would function as a one-way driveway which would exit near the Cannon Street intersection and there would be new security gates at both ends. There are presently two buildings on the site, a barn and an indoor riding arena which are connected by a one-story concourse. There are no changes proposed to the configuration of these buildings. The Existing Conditions Plan in the application set, depicts a dwelling and related improvements which existed on Lot 176 until recently. The dwelling was removed under a demolition permit issued by the West Orange Construction Code Office. The trees that are scheduled for removal are indicated on Sheet SE-2 of the application set, on the Landscape Architect’s drawings, and on the Proposed Conditions Steep Slopes Plan. Steep slopes on the site, immediately adjacent to the site, and in the portion of Nicholas Avenue in which development is proposed are indicated by color shading on the Existing Steep Slopes Plan. As per West Orange’s Steep Slope and Natural Features Ordinance, sloping areas within the 4 categories steeper than 9.99% slope and having a horizontal run of 10 feet or more are mapped by color shading. Within the project area and on adjacent lots, the following steep slope quantities were identified: 10% to 14.99% slopes: 4,631 square feet These slopes are indicated by green shading. 15% to 19.99% slopes: 1,626 square feet These slopes are indicated by pink shading 20& to 24.99% slopes: 1,614 square feet These slopes are indicated by blue shading 15% and greater slopes: 6,960 square feet These

slopes: 1,626 square feet These slopes are indicated by pink shading 20& to 24.99% slopes: 1,614 square feet These slopes are indicated by blue shading 15% and greater slopes: 6,960 square feet These slopes are indicated by orange shading. The soil type mapped by the NRCS at this location is BouB: Urban Land Boonton Substratum Complex. This soil type is not considered to be highly erodible. The water table is expected to be below 80 inches. The water infiltration capacity of the most restrictive layer is expected to be 0.06 to 0.20 inches per hour. The available water supply capacity of the profile from 0” to 60” is expected to be about 4.4 inches. No large surface boulders or rock outcrops were observed within the study area. The steeper slopes (15% and above) occur over rather short horizontal runs with the longest run of slopes 25% and greater being 18 feet. All of the slopes that are 15% and greater seem to be associated with prior development and construction activities such as the construction of the existing riding arena, the grading of the paddock at the east end of the site, the construction of the office building parking lot on Lot 132 to the east, and the storm drain construction in Nicholas Avenue. Page 1

PROPOSED SLOPE DISTURBANCE Proposed disturbance of steep slopes is indicated on the Proposed Conditions Steep Slope Plan by red polylines drawn around the areas where slopes in each steep slope category will be disturbed. The square footage of such proposed disturbance is shown by red numbers adjacent to each polyline. Disturbance of steep slopes is proposed as part of the re-configuration of the sand riding arena. The steep slopes shown near the center of the proposed arena will be eliminated as the final grade of the arena will be level. Disturbance of steep slopes is proposed for the modification of the existing gravel driveway near the southeast corner of the barn. This disturbance is proposed to provide access to and from the manure dumpster pad for a full-size tandem axle roll-off truck and will offer better k-turn capability than presently exists for other vehicles. The man-made 25% slope adjacent to this portion of the driveway will not be re-graded, rather a low modular block retaining wall will be constructed at the base of the slope to provide for the approximately 3 ½ foot widening. Disturbance of steep slopes will also occur associated with the easterly extension of the driveway in Nicholas Avenue. The slopes to be disturbed here are also believed to have been man-made and their horizontal runs are relatively short. Proposed grading in Nicholas Avenue to the north of the proposed driveway has been adjusted since the first issue of the plans to minimize the proposed disturbance. Disturbance of some of the slopes between 10% and 14.99% on the south side of the proposed driveway could be eliminated by installation of a retaining wall which could also reduce the number of trees to be removed. This option was eventually not chosen because of the possible hazards associated with the wall, the possible need for a guard rail and the fact that the trees that would be saved are nearly directly above the Township’s storm drain pipe and accordingly, should be removed. We propose that any disturbed areas of the steep slopes that are not being eliminated should be treated with erosion control matting as part of the final stabilization process. We offer that potential for soil erosion will not be significantly impacted. We also offer that lateral soil support for any structures or property improvements will not be impacted by this proposal. The proposed

t potential for soil erosion will not be significantly impacted. We also offer that lateral soil support for any structures or property improvements will not be impacted by this proposal. The proposed disturbance of steep slopes is tabulated on the Proposed Conditions Steep Slope Plan. A variance is requested for disturbance of steep slopes between 20% and 24.99%. 829 square feet of this scope class will be disturbed being 51 36% of the total area where only 20% disturbance is permitted. Please note that of the 829 square feet of slope disturbance, 548 square feet will result in the elimination of steep slopes. A variance is requested for disturbance of steep slopes 25% and greater. 983 square feet of this scope class will be disturbed being 14.12% of the total area where no disturbance is permitted. Please note that of the 983 square feet of slope disturbance, 624 square feet will be eliminated or re-graded to ve 5% or less. Page 2

CONCLUSION The designer believes that the proposal complies with the provisions of the Stormwater Management Ordinance, reduces stormwater runoff to adjacent properties and public roads and does not create increased demand on the public drainage system. ENCLOSURES Existing Conditions Steep Slopes Plan Proposed Conditions Steep Slopes Plan Page 3.

563110 563190 563270 563350 563430 563510 563590 563670 563750 4518110 4518110 4518030 4518030 4517950 4517950 4517870 4517870 563030 563110 563190 4517790 563270 563350 563430 Map Scale: 1:3,540 if printed on A landscape (11" x 8.5") sheet. N Meters 300 Feet 0 150 300 600 900 Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 18N WGS84 0 50 Natural Resources Conservation Service 100 200 Web Soil Survey National Cooperative Soil Survey 563510 563590 563670 563750 74° 14' 37'' W 4517790 Soil Map may not be valid at this scale. 74° 15' 10'' W 40° 48' 30'' N 40° 48' 47'' N 4518190 4518190 4518270 4518270 563030 40° 48' 47'' N 74° 14' 37'' W 74° 15' 10'' W Soil Map—Essex County, New Jersey (12 Woodland Avenue) 1/5/2025 Page 1 of 3 40° 48' 30'' N

Soil Map—Essex County, New Jersey (12 Woodland Avenue) MAP LEGEND Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp MAP INFORMATION Spoil Area Stony Spot The soil surveys that comprise your AOI were mapped at 1:12,000. Very Stony Spot Warning: Soil Map may not be valid at this scale. Wet Spot Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography Mine or Quarry Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Essex County, New Jersey Survey Area Data: Version 20, Sep 3, 2024 Miscellaneous Water Perennial Water Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Rock Outcrop Date(s) aerial images were photographed: 16, 2022 Saline Spot Sandy Spot Oct 10, 2022—Oct The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 1/5/2025 Page 2 of 3

Soil Map—Essex County, New Jersey 12 Woodland Avenue Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI BogBc Boonton loam, 0 to 8 percent slopes, extremely stony 8.2 15.1% BogCc Boonton loam, 8 to 15 percent slopes, extremely stony 11.9 21.8% BouB Boonton - Urban land, Boonton substratum complex, 0 to 8 percent slopes 26.7 48.9% HanBc Haledon silt loam, 0 to 8 percent slopes, extremely stony 1.6 2.9% HctBc Hasbrouck silt loam, 0 to 8 percent slopes, extremely stony 0.1 0.1% UdbonB Udorthents, Boonton substratum, 0 to 8 percent slopes 2.0 3.6% URBONB Urban land, Boonton substratum, 0 to 8 percent slopes 1.4 2.6% YamnBc Yalesville loam, 0 to 8 percent slopes, extremely stony 2.7 5.0% 54.6 100.0% Totals for Area of Interest Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 1/5/2025 Page 3 of 3

Map Unit Description: Boonton - Urban land, Boonton substratum complex, 0 to 8 percent slopes---Essex County, New Jersey 12 Woodland Avenue Essex County, New Jersey BouB—Boonton - Urban land, Boonton substratum complex, 0 to 8 percent slopes Map Unit Setting National map unit symbol: b12f Elevation: 50 to 500 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 Boonton and similar soils: 50 percent Urban land, boonton substratum: 40 percent Minor components: 10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Boonton Setting Landform: Ground moraines Landform position (three-dimensional): Upper third of mountainflank, center third of mountainflank Down-slope shape: Convex Across-slope shape: Linear Parent material: Coarse-loamy basal till derived from basalt Typical profile A - 0 to 5 inches: loam BA - 5 to 8 inches: silt loam BE - 8 to 17 inches: silt loam Bt - 17 to 30 inches: silt loam Btx1 - 30 to 40 inches: gravelly fine sandy loam Btx2 - 40 to 47 inches: fine sandy loam CBt1 - 47 to 58 inches: loamy sand CBt2 - 58 to 72 inches: loamy sand Properties and qualities Slope: 0 to 8 percent Depth to restrictive feature: 20 to 36 inches to fragipan Drainage class: Well drained Runoff class: Low 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 supply, 0 to 60 inches: Low (about 4.4 inches) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 1/5/2025 Page 1 of 2