13 2026 02 12 Crestmont CC Stormwater O and M Manual

STORMWATER OPERATION & MAINTENANCE MANUAL for CRESTMONT COUNTRY CLUB & EAGLE ROCK AVE IMPROVEMENTS BLOCK No. 174, LOT No. 1.01 TOWNSHIP OF WEST ORANGE, ESSEX COUNTY, NEW JERSEY Prepared For: Crestmont Country Club, Inc. 750 Eagle Rock Avenue West Orange, New Jersey 07052 Prepared By: Langan Engineering & Environmental Services, LLC 300 Kimball Drive Parsippany, New Jersey 07054 NJ Certificate of Authorization No: 24GA27996400 Michael Vitello, P.E. John Coté, P.E. New Jersey Professional Engineer Lic. No. 24GE03705800 February 12, 2026 101049802

TABLE OF CONTENTS 1.0 INTRODUCTION ................................................................................................................. 1 2.0 PROJECT DESCRIPTION .................................................................................................... 1 3.0 STORMWATER MAINTENANCE OBJECTIVE ................................................................... 2 4.0 CONSTRUCTED STORMWATER MANAGEMENT SYSTEM ELEMENTS ........................ 3 4.1 STORMWATER MANAGEMENT BMPS .................................................................................. 3 4.1.1 Small-Scale Bioretention Basins ................................................................................ 3 4.1.2 Porous Pavement Systems ....................................................................................... 4 4.2 STORMWATER CONVEYANCE NETWORK .............................................................................. 4 4.2.1 Storm Sewer Conveyance Piping .............................................................................. 4 4.2.2 Precast Concrete Structures...................................................................................... 4 5.0 INSPECTION AND MAINTENANCE PROCEDURES .......................................................... 5 5.1 PREVENTATIVE MAINTENANCE MEASURES .......................................................................... 5 5.1.1 Conveyance Networks .............................................................................................. 5 5.1.2 Small-Scale Bioretention Basins ................................................................................ 6 5.1.3 Porous Pavement Systems ....................................................................................... 7 5.2 CORRECTIVE MAINTENANCE MEASURES.............................................................................. 7 6.0 ESTIMATED COST FOR MAINTENANCE PROCEDURES ................................................. 8 i

LIST OF DRAWINGS DRAWING DESCRIPTION CG101 Partial Grading Plan CG102 Partial Grading Plan CG103 Partial Drainage Plan CG104 Partial Drainage Plan CG501 Drainage Details CG502 Drainage Details LIST OF APPENDICES APPENDIX DESCRIPTION A Stormwater Management Facilities – Inspection Checklist B Stormwater Management Facilities – Maintenance Log ii

1.0 INTRODUCTION The New Jersey Administrative Code NJAC 7:8-5.8 entitled “Maintenance Requirements” sets forth rules and refers to the New Jersey Stormwater Best Practices Manual (the BMP manual) by the New Jersey Department of Environmental Protection (NJDEP). Chapter 8 of the BMP manual entitled “Maintenance and Retrofit of Stormwater Management Measures” specifically addresses the requirements for maintenance of a major development. Major development is defined in the aforementioned administrative code as any development that provides for ultimately disturbing one or more acres of land or increasing the amount of impervious surface by one-quarter of an acre. This report is prepared to address the maintenance component of the herein described development to ensure the effective, efficient, and enduring service of a particular stormwater measure. This plan contains preventative and corrective maintenance tasks and procedures. The party responsible for the preventative and corrective maintenance of the stormwater measures described herein is: Crestmont Country Club, Inc. 750 Eagle Rock Avenue West Orange, New Jersey 07052 Contact: Dana Cancellaro Phone: 973-731-2060 x256 Email: dana@crestmontcountryclub.com 2.0 PROJECT DESCRIPTION The project site is comprised of Block No.174, Lot No. 1.01 in the Township of West Orange, Essex County, New Jersey. The 146.76± acre tract is the location of Crestmont Country Club and predominantly covered by the grassed golf course, along with some wooded areas. The site is bound by Laurel Avenue and Eagle Rock Avenue to the north, undeveloped wooded area to the east and south, and a continuation of the Crestmont Country Club golf course to the west. The proposed work will only impact 3.93± acres of the site, located along Eagle Rock Avenue and Laurel Avenue in the north side of the property. The proposed development includes the construction of: • Installation of a new traffic signal at Eagle Rock Avenue & Oval Road intersection; • Widening along Eagle Rock Avenue to support the new lane geometry required at the new signal; 1

• Re-alignment of the Crestmont egress driveway to connect into the new intersection; and, • Onsite improvements to both increase the number of parking spaces and re-design the parking around the new egress driveway. The proposed development disturbs more than one acre of land; therefore, this project is considered a “major development” from a stormwater management perspective, and the proposed design is required to address stormwater quantity, quality, and groundwater recharge requirements. The proposed stormwater management system consists of the following: • A subsurface conveyance system consisting of inlets, manholes, and pipes to convey stormwater runoff from the 25-year design storm event; • 2 small-scale bioretention basins; and, • 1 porous asphalt pavement system. 3.0 STORMWATER MAINTENANCE OBJECTIVE The stormwater management system for the proposed development is intended to collect and convey the stormwater runoff. Regular maintenance procedures are required to ensure the consistent operation and safe conditions of the stormwater management facilities and prevent the occurrence of problems and malfunctions. The maintenance program provides the stormwater maintenance procedures for the site. The maintenance plan shall be evaluated and adjusted as needed. Funding shall be allocated to cover costs of preventive and corrective maintenance. Such funding must cover the costs of staffing, equipment, materials, maintenance, emergency repairs, replacement of equipment, training of employees, administrative costs, disposal costs and permit fees. Regularly scheduled inspection and maintenance is necessary to ensure long-term operation and safety of stormwater management facilities. Inspection and maintenance procedure shall be recorded through detailed logs. Copies of maintenance related work orders shall be retained. Logs, work orders, the maintenance plan, and documentation of its evaluation shall be made available, upon request by any public entity with administrative, health, environmental or safety authority of the site. Maintenance personnel shall be trained about the purpose and operation of the stormwater management facilities. They must understand the importance of the maintenance of such facilities and the consequences of neglect. The training shall include maintenance and inspection techniques,

ater management facilities. They must understand the importance of the maintenance of such facilities and the consequences of neglect. The training shall include maintenance and inspection techniques, proper record keeping, and emergency procedures. Sample 2

maintenance work order and inspection checklist and logs have been provided in Appendix A and B of this manual. Actual maintenance work order and inspection checklists and logs shall be developed as part of the site stormwater facilities maintenance program. 4.0 CONSTRUCTED STORMWATER MANAGEMENT SYSTEM ELEMENTS The on-site stormwater management system includes best management practices (BMPs) designed to meet the stormwater quantity, quality, and groundwater recharge requirements for the project site, as well as series of subsurface conveyance systems comprised of precast inlets, manhole structures, drainage pipes, and riprap aprons, which convey stormwater runoff to and from the stormwater management BMPs and ultimately to the proposed off-site discharge points. 4.1 Stormwater Management BMPs The proposed redevelopment incorporates the following BMPs into the stormwater management design: 2 small-scale bioretention basins and 1 porous asphalt pavement system. Refer to Drawings CG103 and CG104 for the location of each proposed BMP; the table below lists each BMP proposed on the property that is subject to the requirements set forth in this maintenance plan. Table 1 – Summary of Proposed BMPs BMP Designation Type of BMP Location on Project Site Small-scale under-drained Southeast of the Laurel Ave and Eagle SSBB-1 bioretention basin Rock Ave intersection Small-scale under-drained East of the proposed driveway SSBB-2 bioretention basin connection to Eagle Rock Ave PAPS-1 Porous Pavement Parking Spaces south of SSBB-2 4.1.1 Small-Scale Bioretention Basins There are 2 small-scale bioretention basins proposed on the project site. The basins are comprised of a 24-inch thick soil media layer, underlain by a 6” thick sand layer and an underdrain collection system comprised of perforated 6” diameter HDPE pipes encased by a minimum of 3 inches of AASHTO #57 stone aggregate both above and below the collection system piping. A variety of ornamental grasses, plants, and shrubs are planted within the basin to promote uptake of pollutants and evapotranspiration. An outlet control structure

below the collection system piping. A variety of ornamental grasses, plants, and shrubs are planted within the basin to promote uptake of pollutants and evapotranspiration. An outlet control structure maintains specific water levels within the basins for each design storm event. 3

The bioretention basins are designed to store and percolate the volume of stormwater generated by the water quality design storm event, which is defined as 1.25 inches of rainfall over a period of 2 hours. For each basin, the first outlet opening within the outlet control is set a maximum 12” above the bottom of the storage area of the basin in order to promote infiltration through the soil media layer and achieve 80% or 90% TSS removal. 4.1.2 Porous Pavement Systems There is 1 porous pavement systems proposed on the project site. Porous pavement systems consist of a porous asphalt surface layer, a choker course that filters pollutants, subbase aggregate that acts as the stormwater runoff storage component of the BMP, and an underdrain collection system comprised of perforated 4” diameter HDPE pipes encased by stone aggregate both above and below the collection system piping. The depth of the subbase aggregate has been designed to store the volume of stormwater generated by the water quality design storm event in order to achieve 80% TSS removal credit. The underdrain collection system prevents runoff from infiltrating into the native subsoils; instead, the runoff is captured and discharged into the proposed subsurface conveyance network. 4.2 Stormwater Conveyance Network The proposed project utilizes various series of subsurface conveyance networks to facilitate the collection and conveyance of stormwater runoff for the 25-year design storm event. The conveyance networks consist of precast concrete inlet structures, precast concreate manhole structures, drainage piping, and riprap aprons. Refer to Drawings CG103 and CG104 – Partial Drainage Plans – for an overview of the conveyance network and location of various pipes and structures. 4.2.1 Storm Sewer Conveyance Piping High Density Polyethylene (HDPE) Pipe is proposed for the conveyance of stormwater where the proposed cover over the top of the pipe is a minimum 2 feet. Class V reinforced concrete pipe (RCP) is proposed within the right-of-way. Perforated HDPE pipe is proposed to be utilized as the underdrain collection system piping for the BMPs specified to utilize an underdrain collection system as part of their design. An HDPE flared-end section is proposed in bioretention basin SSBB-2. 4.2.2 Precast Concrete Structures Precast concrete inlets utilized throughout the site generally consist of

part of their design. An HDPE flared-end section is proposed in bioretention basin SSBB-2. 4.2.2 Precast Concrete Structures Precast concrete inlets utilized throughout the site generally consist of NJDOT Type A, Type B, and Type E inlets. Type B curb inlets will be fitted with Type N Eco curb pieces to prevent trash and floatables from entering the conveyance network. All inlet grates shall be bicycle-safe, and 4