V4 12 Stormwater Maintenance Manual

STORMWATER MAINTENANCE MANUAL FOR DAUGHTERS OF ISRAEL 1155 PLEASANT VALLEY WAY LOT 12, BLOCK 171 SUBMITTED TO: WEST ORANGE ZONING BOARD OF ADJUSTMENT PREPARED BY: PETRY ENGINEERING, LLC 155 PASSAIC AVENUE FAIRFIELD, NEW JERSEY 07004 973-227-7004

STORMWATER MAINTENANCE MANUAL FOR DAUGHTERS OF ISRAEL 1155 PLEASANT VALLEY WAY LOT 12, BLOCK 171 SUBMITTED TO: WEST ORANGE ZONING BOARD OF ADJUSTMENT PREPARED BY: PETRY ENGINEERING, LLC 155 PASSAIC AVENUE FAIRFIELD, NEW JERSEY 07004 973-227-7004 J. Michael Petry J. MICHAEL PETRY, PE, PP, AIA NJ PROFESSIONAL ENGINEER #36662 OCTOBER 28, 2022 REVISED: JANUARY 26, 2023

Table of Contents I. Introduction II. SUBSURFACE DETENtion Basin A. General Maintenance III. SURFACE DETENtion Basin A. General Maintenance B. Vegetated Areas C. Structural Components D. Other Maintenance Procedures E. Access IV. Maintenance Cost Estimate V. Appendix Table 4 – 1 Summary of Maintenance Procedures Table 4 – 2 Maintenance Equipment and Materials Table 4 – 3 Maintenance Work Order and Checklist Table 4 – 4 Maintenance Log Table 4 – 5 Inspection Checklist Table 4 – 6 Inspection Log Exhibit 1 Green Roof Maintenance Guide 3

I. INTRODUCTION This Manual presents specific maintenance information about structural and nonstructural stormwater management measures that shall be used to address stormwater quality and quantity requirements of the NJDEP Stormwater Management Rules at N.J.A.C. 7:8, as applied to the proposed site. One specific structural measure, also known as a Best Management Practices (BMPs), included in this manual is: 1. Subsurface Detention Basin #1A 2. Subsurface Detention Basin #1B 3. Detention Basin #2 4. Detention Basin #3 5. Green Roof The specific maintenance plans for the structural/non-structural BMPs included in this Manual will be followed by those parties responsible for their operation and maintenance. To assist the operator and maintenance inspector of the on-site stormwater management facilities, copies of tables, sample checklists, and logs from the NJDEP Stormwater Management Facilities Maintenance Manual are included in the Appendix of this Manual. A maintenance guide from GreenGrid Roofs is also included in the Appendix of this Manual. The responsible party for the subject site operation and maintenance is: Daughters of Israel 1155 Pleasant Valley Way West Orange, New Jersey 07052 (973) 731-5100 II. SUBSURFACE DETENTION BASIN A. GENERAL MAINTENANCE • Inspection of each of the subsurface detention systems as well as the orifi within each of the outlet structures associated with the basins shall be performed at a minimum of once per year or after a major rainfall event. • Cleaning should be done at the discretion of individuals responsible to maintain proper storage and flow. • Use a stadia rod to check the depth of sediment within the system. Cleaning should be considered when sediment build up is between 5% and 20% of the pipe diameter. Cleaning should occur at the next earliest opportunity if sediment build up exceeds 20% of the pipe diameter. 4

• Cleaning and maintenance shall be scheduled during a relatively dry season. • Access and inspection to each subsurface detention basin is through the 4’X4’ Box Outlet structure associated with that basin, and the 36” access risers provided at each corner of the subsurface detention basins. Those structures as well as the 6” cleanout ports can be used for cleaning with a vacuum truck or a water-jetting device. • See HDPE Detention System Maintenance Technical Note (attached within this manual) for additional information. III. SURFACE DETENTION BASIN A. GENERAL MAINTENANCE • All detention basin 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 1 inch of rainfall. These components shall include bottoms, riprap or gabion aprons and inflow points. • Sediment removal shall take place when the basin is thoroughly dry (See Appendix, Exhibit 1, for recommended hand tools). • Disposal of debris, trash, sediment, and other waste material must be done at suitable disposal/recycling sites and in compliance with all applicable local, state, and federal waste regulations. B. VEGETATED AREAS • Grass shall be mowed to a height of 2 to 3 inches at least once a month during the growing season. • Vegetated areas must be inspected at least annually for erosion and scour. • Vegetated areas shall also be inspected at least annually for unwanted growth, which shall be removed with minimum disruption to the bottom surface and remaining vegetation. • The structure must be inspected for unwanted tree growth at least once a year. 5

• At the time of initial establishment of the permanent grass mixture specified for the detention basin, bi-weekly inspections of vegetation health shall be performed during the first growing season or until the grass vegetation is established. The New Jersey recommended grass seed mixture is No. 14 Turf-Type Tall Fescue (Blend of 3 cultivars) at planting rate of 3.5 lbs/1000 square feet (Appendix, Exhibit 1). Once established, inspections of vegetation (grass) health, density, and diversity shall be performed at least twice annually during both the growing and non-growing seasons. • The vegetative cover (grass mixture) should be maintained at 85 percent. If vegetation has greater than 50 percent damage, the area should be re-established by overseeding with the above-specified grass seed mixture in accordance with the original specifications contained in the project Landscape Plan and Soil Erosion and Sediment Control Plan. • All use of fertilizers, mechanical treatments, pesticides, and other means to assure optimum vegetation health must be minimized as to not compromise the intended purpose of the detention basin. All vegetation deficiencies should be addressed without the use of fertilizers and pesticides whenever possible. C. STRUCTURAL COMPONENTS • All structural components must be inspected for cracking, subsidence, spalling, erosion, and deterioration at least annually (See Appendix, Figure 1 – Stormwater Location Plan) D. OTHER MAINTENANCE PROCEDURES • The detention basins have been designed to drain in less than 72 hours as the approximate time it would normally take to completely drain the maximum design storm runoff volume (100 yr storm) from each basin. If significant increases or decreases in the normal drain time are observed, the basin’s outlet structure, underdrain system, and both groundwater and tailwater levels must be evaluated and appropriate measures taken to comply with the maximum drain time requirements and maintain the proper functioning of the basin. Below is a table relating the approximate times to drain versus inches of rainfall: Storm Event (yr.) Inches of Rainfall Time to Drain Time to

functioning of the basin. Below is a table relating the approximate times to drain versus inches of rainfall: Storm Event (yr.) Inches of Rainfall Time to Drain Time to Drain (hrs.) (hrs.) Basin #2 Basin #3 100 8.66 27 27 6

• The detention basins shall be inspected and monitored for mosquito breeding conditions. If significant mosquito breeding is observed, the Essex County Department of Public Works-Mosquito Control shall be contacted at (973) 239- 0342. E. ACCESS • Access to the detention basins is shown on Figure 1 in the Appendix of this Manual. IV. MAINTENANCE COST ESTIMATE Sub-Surface Detention Basins ………………………………$1,500 – $2,000 per year Surface Detention Basins…….…………………..……………….…....$1,500 per year Green Roof……………………………………………………………..$1,000 per year Maintenance cost estimate includes all maintenance tasks, including seed, equipment, sediment, trash and debris removal. Maintenance cost estimates are based on engineering assumptions, manufacturer’s recommendations as well as the relative frequency of maintenance. Actual costs may differ from estimate. V. APPENDIX TABLE 4 – 1 SUMMARY OF MAINTENANCE PROCEDURES TABLE 4 – 2 MAINTENANCE EQUIPMENT AND MATERIALS TABLE 4 – 3 MAINTENANCE WORK ORDER AND CHECKLIST TABLE 4 – 4 MAINTENANCE LOG TABLE 4 – 5 INSPECTION CHECKLIST TABLE 4 – 6 INSPECTION LOG EXHIBIT 1 GREEN ROOF MAINTENANCE GUIDE 7

HDPE PIPE REPAIR OPTIONS

WATS es TECHNICAL NOTE HDPE Pipe Repair Options ERS ae aan ee ae TN 5.03 January 2010 Introduction High-density polyethylene (HDPE) pipe is lightweight and very easy to handle. The attributes that make the pipe easy to use can also make it easy to abuse, resulting in damaged pipe or joints. This technical bulletin discusses some of the products available that can be used to repair damaged HDPE pipe or joints in the field. Repair Options One of the primary considerations in selecting a repair method is the degree of joint performance required. Watertight repairs are generally used on pipe with watertight joints, and soil-tight repairs on pipe with soil-tight joints. This helps keep costs in line and prevents the repair from being the weak area of the pipe system. The way in which a pipe can be accessed is another primary consideration which influences what type of repair alternative is selected. Pipe that is not yet buried, or can be easily excavated, can be repaired from the exterior. If the pipe is buried and cannot be conveniently excavated, an internal repair may be the best alternative. If the pipe is too ‘small to enter, there are companies with remote controlled equipment that can install the product. Each situation must be considered individually. The repair options addressed below are divided into external repairs and internal repairs. During any pipe repair, backfill should be placed and compacted per project specifications to provide proper support for the pipe and coupler. External Mechanical Repairs Mar Mac Polyseal Pipe Coupler, 4- through 60-inch (100 - 1500 mm), consists of a mastic adhesive base layer, a cross-laminated polyethylene middle layer with a spun-bonded geotextile polypropylene cloth outer layer. The coupler incorporates a self-adhering rubberized bonding mastic and securing bands to insure a positive seal around the pipe. . If the pipe itself is damaged, the damaged area will need to be removed and a new pipe section spliced in-before installing a coupler around both ends. Polyseal Pipe Couplers are reasonably priced, especially when considering the quality of the finished repair, and are typically used with soil-tight smooth interior corrugated HDPE pipe products. Note: Mar-Mac bands shall be installed in accordance with manufacturer's recommendations. ao Snap couplers, 4- through 8-inch (100 — 200 mm), and split