JMA02P003 262 270 Main Street Development Stormwater Management Report

Porous Pavement B Input Values 0.50 R Recharge rate (permeability rate) (in/hr) Specific yield, Sy (dimensionless) 0.150 Sy default value is 0.15; max value is 0.2 provided that a lab test data is submitted Horizontal hydraulic conductivity (in/hr) 0.50 Kh Kh = 5xRecharge Rate (R) in the coastal plain; Kh=R outside the coastal plain 9.000 x 1/2 length of basin (x direction, in feet) 121.170 y 1/2 width of basin (y direction, in feet) 5.61 t Duration of infiltration period (hours) 10.00 hi(0) Initial thickness of saturated zone (feet) 13.996 h(max) Maximum thickness of saturated zone (beneath center of basin at end of infiltration period) 3.996 Δh(max) Maximum groundwater mounding (beneath center of basin at end of infiltration period) Distance from Ground-water center of basin in x Mounding, in feet direction, in feet 3.996 0 2.455 10 Re-Calculate Now 0.372 20 0.028 30 Groundwater Mounding, in feet 0.002 40 4.500 0.002 50 4.000 0.002 60 0.002 70 3.500 0.002 80 3.000 0.002 90 2.500 2.000 1.500 1.000 0.500 0.000 0 10 20 30 40 50 60 70 80 90 100 -0.500 Disclaimer This spreadsheet solving the Hantush (1967) equation for ground-water

40 50 60 70 80 90 100 -0.500 Disclaimer This spreadsheet solving the Hantush (1967) equation for ground-water mounding beneath an infiltration basin is made available to the general public as a convenience for those wishing to replicate values documented in the USGS Scientific Investigations Report 2010-5102 "Groundwater mounding beneath hypothetical stormwater infiltration basins" or to calculate values based on user-specified site conditions. Any changes made to the spreadsheet (other than values identified as user-specified) after transmission from the USGS could have unintended, undesirable consequences. These consequences could include, but may not be limited to: erroneous output, numerical instabilities, and violations of underlying assumptions that are inherent in results presented in the accompanying USGS published report. The USGS assumes no responsibility for the consequences of any changes made to the spreadsheet. If changes are made to the spreadsheet, the user is responsible for documenting the changes and justifying the results and conclusions.

Engineering Stormwater Narrative JMA02P003- May 26, 2026 262-270 Main St Development Appendix I: Low Impact Development Checklist 12

New Jersey Stormwater Best Management Practices Manual February 2004 A P P E N D I X A Low Impact Development Checklist A checklist for identifying nonstructural stormwater management strategies incorporated into proposed land development According to the NJDEP Stormwater Management Rules at N.J.A.C. 7:8, the groundwater recharge, stormwater quality, and stormwater quantity standards established by the Rules for major land development projects must be met by incorporating nine specific nonstructural stormwater management strategies into the project’s design to the maximum extent practicable. To accomplish this, the Rules require an applicant seeking land development approval from a regulatory board or agency to identify those nonstructural strategies that have been incorporated into the project’s design. In addition, if an applicant contends that it is not feasible to incorporate any of the specific strategies into the project’s design, particularly for engineering, environmental, or safety reasons, the Rules further require that the applicant provide a basis for that contention. This checklist has been prepared to assist applicants, site designers, and regulatory boards and agencies in ensuring that the nonstructural stormwater management requirements of the Rules are met. It provides an applicant with a means to identify both the nonstructural strategies incorporated into the development’s design and the specific low impact development BMPs (LID-BMPs) that have been used to do so. It can also help an applicant explain the engineering, environmental, and/or safety reasons that a specific nonstructural strategy could not be incorporated into the development’s design. The checklist can also assist municipalities and other land development review agencies in the development of specific requirements for both nonstructural strategies and LID-BMPs in zoning and/or land use ordinances and regulations. As such, where requirements consistent with the Rules have been adopted, they may supersede this checklist. Finally, the checklist can be used during a pre-design meeting between an applicant and pertinent review personnel to discuss local nonstructural strategies and LID-BMPs requirements in order to optimize

ally, the checklist can be used during a pre-design meeting between an applicant and pertinent review personnel to discuss local nonstructural strategies and LID-BMPs requirements in order to optimize the development’s nonstructural stormwater management design. Since this checklist is intended to promote the use of nonstructural stormwater management strategies and provide guidance in their incorporation in land development projects, municipalities are permitted to revise it as necessary to meet the goals and objectives of their specific stormwater management program and plan within the limits of N.J.A.C. 7:8.

Low Impact Development Checklist A checklist for identifying nonstructural stormwater management strategies incorporated into proposed land development Municipality: West Orange County: Essex Date: 5/15/2026 Review board or agency: Township of West Orange Planning Board Proposed land development name: 262-270 Main St Site Redevelopment Lot(s): 50 & 55 Block(s): 114 Project or application number: Applicant’s name: Jorge Mastropietro Architects Applicant’s address: 36 Newark Street, Suite 202, Hoboken, NJ 07030 Telephone: (646) 248-6664 Fax: Email address: jm@jmapc.com Designer’s name: Hudson Engineering, LLC. Designer’s address: 25 W 8th Street, Suite B, Bayonne, NJ 07002 Telephone: (201) 589-0906 Fax: Email address: info@hudsoneng.com New Jersey Stormwater BMP Manual • Appendix A: Low Impact Development Checklist • February 2004 • Page A-2

Part 1: Description of Nonstructural Approach to Site Design In narrative form, provide an overall description of the nonstructural stormwater management approach and strategies incorporated into the proposed site’s design. Attach additional pages as necessary. Details of each nonstructural strategy are provided in Part 3 below. The existing site consists of mostly impervious area. The total impervious area decreased by approximately 900 square feet and replaced with lawn area and landscaping, which is the only measure that can be practically taken given the site's conditions. New Jersey Stormwater BMP Manual • Appendix A: Low Impact Development Checklist • February 2004 • Page A-3

Part 2: Review of Local Stormwater Management Regulations Title and date of stormwater management regulations used in development design: N.J.A.C. 7:8 Do regulations include nonstructural requirements? Yes: No: X If yes, briefly describe: List LID-BMPs prohibited by local regulations: N/A Pre-design meeting held? Yes: Date: No: X Meeting held with: Pre-design site walk held? Yes: Date: No: X Site walk held with: Other agencies with stormwater review jurisdiction: Name: Township of West Orange Planning Board Required approval: Name: Required approval: Name: Required approval: New Jersey Stormwater BMP Manual • Appendix A: Low Impact Development Checklist • February 2004 • Page A-4

Part 3: Nonstructural Strategies and LID-BMPs in Design 3.1 Vegetation and Landscaping Effective management of both existing and proposed site vegetation can reduce a development’s adverse impacts on groundwater recharges and runoff quality and quantity. This section of the checklist helps identify the vegetation and landscaping strategies and nonstructural LID-BMPs that have been incorporated into the proposed development’s design to help maintain existing recharge rates and/or minimize or prevent increases in runoff quantity and pollutant loading. A. Has an inventory of existing site vegetation been performed? Yes: No: X If yes, was this inventory a factor in the site’s layout and design? Yes: No: B. Does the site design utilize any of the following nonstructural LID-BMPs? Preservation of natural areas? Yes: No: X If yes, specify % of site: Native ground cover? Yes: No: X If yes, specify % of site: Vegetated buffers? Yes: No: X If yes, specify % of site: C. Do the land development regulations require these nonstructural LID-BMPs? Preservation of natural areas? Yes: No: X If yes, specify % of site: Native ground cover? Yes: No: X If yes, specify % of site: Vegetated buffers? Yes: No: X If yes, specify % of site: D. If vegetated filter strips or buffers are utilized, specify their functions: Reduce runoff volume increases through lower runoff coefficient: Yes: No: Reduce runoff pollutant loads through runoff treatment: Yes: No: Maintain groundwater recharge by preserving natural areas: Yes: No: New Jersey Stormwater BMP Manual • Appendix A: Low Impact Development Checklist • February 2004 • Page A-5

3.2 Minimize Land Disturbance Minimizing land disturbance is a nonstructural LID-BMP that can be applied during both the development’s construction and post-construction phases. This section of the checklist helps identify those land disturbance strategies and nonstructural LID-BMPs that have been incorporated into the proposed development’s design to minimize land disturbance and the resultant change in the site’s hydrologic character. A. Have inventories of existing site soils and slopes been performed? Yes: X No: If yes, were these inventories factors in the site’s layout and design? Yes: X No: B. Does the development’s design utilize any of the following nonstructural LID-BMPs? Restrict permanent site disturbance by land owners? Yes: No: X If yes, how: Restrict temporary site disturbance during construction? Yes: No: X If yes, how: Consider soils and slopes in selecting disturbance limits? Yes: No: X If yes, how: C. Specify percentage of site to be cleared: 0% Regraded: 100% D. Specify percentage of cleared areas done so for buildings: N/A For driveways and parking: For roadways: New Jersey Stormwater BMP Manual • Appendix A: Low Impact Development Checklist • February 2004 • Page A-6