22 O and M Manual NJA23013900 August 2025

STORMWATER MANAGEMENT FACILITIES OPERATIONS & MAINTENANCE MANUAL for Proposed Retail Store Prepared for Block 157 | Lot 5 457 Mount Pleasant Avenue Township of West Orange Essex County, New Jersey Prepared by N.J. Certificate of Authorization 24GA28161700 30 Independence Blvd., Suite 200 Warren, NJ 07059 908-668-8300 ________________________________________________ Tung-To Lam, P.E. New Jersey Professional Engineer License No. 47863 August 2025 BENJ File No. NJA230139.00

TABLE OF CONTENTS 1.0 PROJECT DETAILS ........................................................................................................................ 3 1.1 Introduction and Description of Facilities: ........................................................................................ 3 1.2 Project Contacts: .............................................................................................................................. 3 2.0 INSPECTION AND MAINTENANCE: .............................................................................................. 4 2.1 Routine Inspection and Maintenance of the Stormwater Management Facilities: ........................... 4 2.1.1 Preventative Maintenance Procedures: .................................................................................. 4 2.1.2 Corrective Maintenance Procedures: ...................................................................................... 7 2.1.3 Aesthetic Maintenance Procedures: ....................................................................................... 8 2.1.4 Summary of Maintenance Procedures: ................................................................................. 10 2.1.5 Maintenance Equipment and Materials ................................................................................. 10 2.1.6 Checklists and Logs .............................................................................................................. 11 Appendix 1. “Maintenance Work Order and Checklist” – a comprehensive form outlining both required and completed maintenance work. 2. “Maintenance Log” – a summary table for recording of all maintenance work at the site. 3. “Inspection Log” – a summary table for recording the results of all inspections of the basins. 2

1.0 PROJECT DETAILS 1.1 Introduction and Description of Facilities: The project site has frontage in the South along Mount Pleasant Avenue, in the West along Pleasant Valley Way, and in the North along Mount Pleasant Place. The project is situated within the Township of West Orange, Essex County, New Jersey. The subject site is more specifically defined as Block 157, Lot 5. Under existing conditions, the site is approximately 161,597 SF (3.71 AC) and consists of a Green House, a One-Story Masonry Retail Building, a One-Story Brick Retail Building, a parking lot with 165 parking stalls, and landscaping areas. Under proposed conditions, the existing Green House will be demolished, the One-Story Masonry Retail Building footprint will remain the same with a new proposed Retail Store in the western portion of the building, and the One-Story Brick Retail Building will remain. The proposed parking lot design will be reconfigured. The landscaping areas will be enhanced and include 10 proposed replacement trees to account for the 5 trees to be removed during demolition. The various design parameters established by the Township of West Orange, specifically the Stormwater Ordinance 2918-25, will require the construction of a pervious pavement system. The pervious pavement system will collect runoff from the proposed site development. The pervious pavement system is proposed to enhance discharge water quality for the existing site. Note that the subject site is within Metropolitan Planning Area (PA-1), is previously developed, and is a known contaminated site, and therefore, the subject site is exempt from the NJDEP recharge requirements. Under post-development conditions, the stormwater management facilities will include a pervious pavement system and associated outlet structure, inspection ports, cleanouts, and piping. This manual consists of three parts. The first part includes the introduction, project description and a list of project contacts. The second part provides the operation and maintenance instructions for the facilities and equipment. The third part (Appendix) provides information regarding the inspection and maintenance activities. 1.2 Project Contacts: Municipal Engineer: Address: 25 Lakeside Avenue, West Orange, NJ 07052 Tel: (973) 325-4160 Attn: Zayibeth Carballo Department of Public Works & Engineering Address: 25 Lakeside Avenue, West Orange, NJ

Municipal Engineer: Address: 25 Lakeside Avenue, West Orange, NJ 07052 Tel: (973) 325-4160 Attn: Zayibeth Carballo Department of Public Works & Engineering Address: 25 Lakeside Avenue, West Orange, NJ 07052 Tel: (973) 325-4067 Attn: Louis Reynolds, Director/Superintendent of Public Works 3

Site Design Engineer: Bohler Address: 30 Independence Blvd., Suite 200, Warren, NJ 07059 Tel: (908) 668-8300 Attn: Tung-To Lam, P.E. Party Responsible for Maintaining Stormwater Management Facility: Property Owner 2.0 INSPECTION AND MAINTENANCE: 2.1 Routine Inspection and Maintenance of the Stormwater Management Facilities: The pervious pavement system has been designed to control degradation of water quality. Without proper routine inspection and maintenance, the system may lose some or all of its capability to function to its full capacity. Lack of adequate maintenance of this system could lead to system failures. Regularly scheduled maintenance inspections of the stormwater facilities should be performed at least four (4) times each year. The primary purpose of these inspections is to ascertain the operational condition and safety of the facilities, particularly the condition of outlet structure, sedimentation and other safety-related aspects. Inspections will also provide information on the effectiveness of regularly scheduled Preventative and Aesthetic Maintenance Procedures, and will help to identify where changes in the extent and scheduling of the procedures are warranted. Finally, the facility inspections should also be used to determine the need for and timing of Corrective Maintenance procedures. Routine maintenance of these facilities should be separated into two (2) basic types: Functional Maintenance and Aesthetic Maintenance. Functional Maintenance is further broken down into two (2) categories: Preventative and Corrective. Aesthetic Maintenance, which is necessary to maintain the visual appeal and aesthetic quality of these facilities, should be incorporated on the same schedule as the Preventative Maintenance efforts. Listed below are the Preventative, Corrective and Aesthetic Maintenance Procedures to be performed on a routine basis: 2.1.1 Preventative Maintenance Procedures: The purpose of Preventative Maintenance is to maximize the effectiveness of the stormwater management aspects of the pervious pavement system so that it can remain operational and safe and to minimize the need for potential emergency or extensive corrective maintenance. These procedures are as follows: a) Weed Growth: Weeds associated with pervious pavement systems typically fall into three (3) categories: submergent, floating and emergent. All three (3) are

enance. These procedures are as follows: a) Weed Growth: Weeds associated with pervious pavement systems typically fall into three (3) categories: submergent, floating and emergent. All three (3) are typically found, to some extent, in a stormwater management system. However, excessive growth of any of these weeds can lead to problems. 4

The pervious pavement system should be evaluated regularly to determine whether excessive invasive plant growth is evident. If it occurs, this situation can be corrected by appropriate application of fertilizers and weed killers. Weeds which have become a problem can be cleared through manual removal by professional pond maintenance technicians, in the case of the small wet pond. b) Maintenance of Adjacent Areas: Grass areas, trees, and shrubs adjacent to the pervious pavement system and conveyance swales require periodic routine maintenance to include fertilizing, dethatching and soil conditioning in order to maintain healthy growth and to provide bank stabilization. The application of fertilizers should follow manufacturer’s instructions to reduce run-off of these compounds into the pervious pavement system. Additionally, provisions should be made to re-seed and re-establish grass cover in areas damaged by sediment accumulation, stormwater flow, or other causes. These tasks should be performed, or at least evaluated, on a quarterly basis. Lawn areas should be mowed at least once a month during the growing season. Vegetated areas must be inspected at least annually for erosion and scour as well as unwanted growth, which should be removed with minimum disruption to the remaining vegetation. Note: All use of fertilizers, mechanical treatments, pesticides and other means to ensure optimum vegetation health must not compromise the intended purpose of the stormwater management facility. All vegetation deficiencies should be addressed without the use of fertilizers and pesticides whenever possible and if necessary, the minimum amount practical. c) Removal and Disposal of Trash/Debris and Sediment: All stormwater management components expected to receive and/or trap debris and sediment must be inspected for clogging and excessive debris and sediment accumulation at least four times annually as well as after every storm exceeding one inch of rainfall in 24 hours. Such components should include pervious pavement system bottom and inspection ports. Removal of trash and debris will prevent possible damage to vegetated areas and minimize potential mosquito breeding habitats. Debris and trash must be properly hauled off the site and transferred to an approved disposal site. Accumulated sediment should be removed before it threatens the storage volume of the pervious

itats. Debris and trash must be properly hauled off the site and transferred to an approved disposal site. Accumulated sediment should be removed before it threatens the storage volume of the pervious pavement system. Before de-sedimentation activities are performed, consideration should be given to evacuating all standing water from the pervious pavement system. Disposal of discharged water and sediment must comply with all local, county, state and federal regulations. Only suitable disposal sites should be utilized. If stable soil conditions exist around the pervious pavement system, sediment deposition should not be an excessive maintenance issue. 5

Should a recurrent stabilization situation develop, the inspector should identify the upstream sources of sediment and recommend required stabilization measures. d) Elimination of Potential Mosquito Breeding Habitats: The most effective mosquito control program is one that eliminates potential breeding habitats. Almost any stagnant pool of water can be attractive to mosquitoes, and may become the source of a large mosquito population. A maintenance program dedicated to eliminating potential breeding areas is preferable to chemical means of controlling mosquitoes. The most important maintenance functions, is removal of all obstructions to natural flow patterns before stagnant water conditions can develop. e) Specific Maintenance of Pervious Pavement System Pipes & Chambers: The pervious pavement system pipes and chambers are to be evaluated for excessive deposition of sediment and debris in pipe and chamber inverts. The ground and paved parking lots above and adjacent to the pervious pavement system shall be evaluated for excessive settlement. f) Parking lot maintenance: This management measure involves employing pavement cleaning practices, such as parking lot sweeping on a regular basis, to minimize pollutant export to the stormwater conveyance system / pervious pavement system and eventually the receiving waters. These cleaning practices are designed to remove sediment, debris, and other pollutants from access drive and parking lot surfaces that are a potential source of pollution impacting urban waterways. Mechanical machines that use vacuum assisted dry sweeping to remove particulate matter shall be utilized as these have the ability to remove finer sediment particles. Parking lots and access drives shall be swept / vacuumed at least semi-annually or more often as conditions warrant. The disposal of the swept material must be properly hauled off the site and transferred to an approved disposal site. Other parking lot maintenance features include the use of on-site trash receptacle. These receptacles should be located in strategic areas where the majority of the pedestrian traffic occurs. These receptacles should be emptied weekly. The disposal of the solid waste must be properly hauled off the site and transferred to an approved disposal site. 6

2.1.2 Corrective Maintenance Procedures: a) Removal of Debris and Sediment: Sediment, debris and trash which threaten the discharge capacity of the pervious pavement system should be removed immediately and properly disposed of. As noted previously, it is recommended that all water be evacuated from the pervious pavement system before any significant amount of sediment, settled debris or trash is removed from the system. b) Structural Repairs: Structural damage to outlet and inlet structures and roadways as a result of vandalism, flood events, settlement or other causes must be repaired promptly. The urgency of the repairs will depend upon the nature of the damage and its effects on the safety and operation of the facility. The analysis of structural damage if it occurs and the design and performance of structural repairs should only be undertaken by a Professional Engineer. c) Weed Harvesting: It may be necessary to remove congested weeds from the pervious pavement system. Companies specializing in manual removal of weeds should be contacted to perform these operations. Note that such work does not usually, but may in some cases require the approval of various regulatory agencies. d) Extermination of Mosquitoes: If neglected, pervious pavement system can become a potential mosquito breeding area. The extermination of mosquitoes will usually require the services of the County Mosquito Commission. If mosquito control in the facility becomes necessary, the preventative maintenance program should be re-evaluated, and more emphasis should be placed on control of mosquito breeding habitats. e) Snow and Ice Removal: Accumulations of snow and ice can threaten the functioning of the inlets and outlets. Provision of the equipment, material and personnel to monitor and remove snow and ice from critical areas will assure the function of the facility during the winter months. 7