Stormwater Management Operation and Maintenance Manual Feb 2026 resubmissionrcd 2 26

STORMWATER MANAGEMENT OPERATION AND MAINTENANCE MANUAL For Mavis Tire Supply, LLC Proposed Automotive Service and Retail Center Block 105, Lot 64.01 460 Prospect Avenue Township of West Orange, Essex County, NJ Prepared by: 5 Greentree Centre, Suite 406 Marlton, NJ 08053 (856) 334-2000 Rodman R. Ritchie, PE, PP NJ Professional Engineer License #43547 February 2026 DEC# 1956-24-04187

TABLE OF CONTENTS PROJECT DETAILS Page No. A. Introduction and Description of Facilities .......................................1 B. Project Contacts ...........................................................................1 C. Proposed Best Management Practices .........................................2 INSPECTION & MAINTENANCE A. Routine Inspection and Maintenance of Management Facilities .................................................................2 1. Preventative Maintenance Procedures ..............................3 2. Corrective Maintenance Procedures..................................4 3. Recording and Logging of all Maintenance Activities .........5 4. Summary of Maintenance Procedures...............................5 B. Maintenance Equipment and Materials .........................................6 C. Checklists and Logs ......................................................................7 D. Estimated Maintenance Costs & Tasks .........................................7 APPENDIX • Maintenance Work Order & Checklist • Maintenance Log • Inspection Log • Inspection Checklist

PROJECT DETAILS A. Introduction and Description of Facilities The purpose of this report is to provide guidelines and information regarding the required maintenance for the proposed stormwater management facilities to be constructed in association with the redevelopment of Block 105, Lot 64.01, located in the Township of West Orange, Essex County, New Jersey. According to the Township of West Orange Zoning Map, the site is located in the (B-2) General Business District. The proposed property consists of 0.74 acres (+/-32,118 SF) and is located on Prospect Avenue (County Route #677), West Orange Township. The site is currently developed with an existing realtor’s office consisting of a two (2) story building, parking, sidewalks, lighting and other site amenities. The proposed project will replace the existing 3,338 SF (GFA) building east of Prospect Avenue to be redeveloped with an Automative Service and Retail Center. The proposed building will include a total footprint of approximately 6,205 SF. The overall development will result in approximately 0.04 acres of new impervious surfaces and approximately 0.8 acres of land disturbance. Moreover, the proposed development will reduce existing motor vehicle surfaces by approximately 0.009 acres. Additional site improvements include modifications to the associated parking areas, landscaping, lighting, signage, and utilities as reflected on the accompanying Site Plan drawings. The facility will require periodic inspections and maintenance. The following information can be considered a guideline for the continued maintenance including suggested inspection scheduling as well as performance objectives. B. Project Contacts: The applicant is responsible for maintaining a detailed log of all preventative and corrective maintenance actions for the constructed stormwater facilities incorporated into the design, including record of all inspections and copies of all maintenance-related work orders. The applicant is also responsible for maintenance to evaluate the effectiveness of the maintenance plan at least once per year and adjust the plan and deed as needed. The applicant shall retain a copy of this report onsite should a public entity request this report or documentation of said maintenance in the future. Project Sponsor/System Owner: Mavis Tire Supply, LLC 100

ite should a public entity request this report or documentation of said maintenance in the future. Project Sponsor/System Owner: Mavis Tire Supply, LLC 100 Hillside Avenue White Plains, NY 10603 (914) 215-6772 Mavis Tire Supply, LLC February 2026 DEC# 1956-24-04187 1

Design Engineer: Rodman R. Ritchie, PE, PP Dynamic Engineering Consultants, PC 5 Greentree Centre, Suite 406 Marlton, NJ 08053 (856) 334-2000 C. Proposed Best Management Practices: Above-ground Bioretention Basin & Underground Detention Basin The stormwater management design utilizes one (1) above-ground bioretention basin and one (1) underground detention basin. The above-ground bioretention basin accepts stormwater runoff from the proposed parking lots, paved areas, and other open space areas which are designed to convey overland flow directly to the basin via a 4’ wide curb cut and riprap swale. The proposed underground detention basin accepts stormwater runoff from the proposed building, collected by roof drains along the rear of the building. Stormwater will be released at a controlled rate through the outlet control structure from the proposed underground detention basin. Stormwater runoff that is detained within the basins shall drain within 72 hours. If significant increases or decreases in this draining time are observed, a qualified licensed Professional Engineer shall be contacted to evaluate possible corrective measures that may be required. INSPECTION AND MAINTENANCE: A. Routine Inspection and Maintenance of the Stormwater Management Facilities: The stormwater management basin has been designed to control stormwater and reduce flooding and degradation of water quality. Without proper routine inspection and maintenance, the basin may lose some or all of its capability to function at its full capacity. Lack of adequate maintenance at these facilities could lead to system failures. A consulting Professional Engineer should perform regularly scheduled maintenance inspections of the stormwater facilities 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 the outlet structures, trash racks, and other safety-related aspects. Inspections will provide information on the effectiveness of regularly scheduled Preventative Maintenance Procedures and help to identify where changes in the extent and schedule of the procedures are warranted. Finally, the

information on the effectiveness of regularly scheduled Preventative Maintenance Procedures and help to identify where changes in the extent and schedule 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 this facility should be identified as Functional Maintenance. Functional Maintenance is further broken down into two (2) categories: Preventative and Corrective. Listed Mavis Tire Supply, LLC February 2026 DEC# 1956-24-04187 2

below are the Preventative and Corrective Maintenance Procedures to be performed on a routine basis: 1. Preventive Maintenance Procedures: The purpose of Preventative Maintenance is to maximize the effectiveness of the stormwater management aspects of the basin so that it remains operational and safe as often as practicable and to minimize the need for emergency or corrective maintenance. These procedures are as follows: a) 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. Such components may include the basin, stormwater conveyance network (piping & inlet), and outlet control structure. These stormwater management components shall be visually inspected for the accumulation of excessive sediment as well as damage in the form of cracking, erosion, and rutting. Sediment build-up within the stormwater conveyance network shall be removed with the use of flushing. Sediment-laden water is to be captured with the use of a pipe plug, or approved equal, prior to the basin and simultaneously pumped out with the use of a pump with a sediment bag. Sediment should be disposed of in accordance with all applicable local, state, and federal regulations. Removal of trash and debris will prevent possible damage to trash racks and outlet structure openings and eliminate potential mosquito breeding habitats. Debris and trash must be properly hauled off the site and transferred to an approved disposal site. The basin should also be evaluated for excessive deposition of sediment. Accumulated sediment should be removed utilizing light-weight equipment to avoid soil compaction before it threatens the storage volume of the basin. Before de-sedimentation activities are performed, consideration should be given to evacuating all standing water from the basin. This may be accomplished by clearing any blocked openings of the outlet structure or by mechanical means (pumping). Disposal of discharged water and sediment must comply with all local, county,

be accomplished by clearing any blocked openings of the outlet structure or by mechanical means (pumping). 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 on site, sediment deposition should not be an excessive maintenance issue. Should a recurrent stabilization situation develop, the inspector should identify the upstream sources of sediment and recommend required stabilization measures. Access has been provided for inspection and maintenance of the basin and its components. Mavis Tire Supply, LLC February 2026 DEC# 1956-24-04187 3

b) 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 function is the removal of all obstructions to natural flow patterns before stagnant water conditions can develop. In addition to the maintenance program, the basins are designed to completely drain within 72 hours after each rain event. This aids in the goal of preventing stagnate pools of water, resulting in the elimination of potential mosquito breeding habits. c) 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/basin and downstream of the basin discharge. 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 once a month. The disposal of the swept material must be properly hauled off the site and transferred to an approved disposal site. d) Observation After Rainfall: This management measure involves monitoring the amount of time the basin takes to drain to ensure it is working properly. The basin should drain in less than 72 hours after each rain event. If significant increases or decreases are observed in the drawdown time, a qualified licensed Professional Engineer shall be contacted to evaluate the basin’s bottom surface, subsoil, and both groundwater and tailwater elevations to determine what corrective measures may need to be implemented. 2. Corrective Maintenance Procedures:

basin’s bottom surface, subsoil, and both groundwater and tailwater elevations to determine what corrective measures may need to be implemented. 2. Corrective Maintenance Procedures: a) Removal of Debris and Sediment: Sediment, debris, and trash that threaten the discharge capacity of the basin should be removed immediately with the use of light-weight equipment to avoid soil compaction and properly disposed of. As noted previously, it is recommended that all water be evacuated from the basin with a pump before any significant amount of sediment, settled debris, or trash is removed from the basin. The lack of an available disposal site should Mavis Tire Supply, LLC February 2026 DEC# 1956-24-04187 4