J_2024 05 09_West Orange Stormwater Management Plan

Part II- Field Manuals and Maintenance Records Field Manual for Small-Scale Bioretention Ponds with Underdrains Maintenance Logs and Inspection Records March 2024 Stormwater Management Measures Maintenance Plan & Field Manuals

Part I- Maintenance Plan March 2024 Stormwater Management Measures Maintenance Plan & Field Manuals Page 1

List of Stormwater Management Measures The stormwater management measures incorporated into this development are listed below. The corresponding Field Manuals for the stormwater management measures are located in Part II of the Maintenance Plan. Type of Stormwater Management Measure BMP No. Location Description Bioretention System with Underdrains BR-01 Northeast Area Bioretention System with Underdrains BR-02 Middle east Area Bioretention System with Underdrains BR-03 Southeast Area Bioretention System with Underdrains BR-04 South Area Bioretention System with Underdrains BR-05 Southwest Area March 2024 Stormwater Management Measures Maintenance Plan & Field Manuals State Plane Coordinates / Lat., Long. Northing: XXXXXX.11 Easting: XXXXXX.23 Northing: XXXXXX.11 Easting: XXXXXX.23 Northing: XXXXXX.11 Easting: XXXXXX.23 Northing: XXXXXX.11 Easting: XXXXXX.23 Northing: XXXXXX.11 Easting: XXXXXX.23 Page 2

Location Map BR1 BR2 BR3 BR5 No. BR-01 BR-02 BR-03 BR-04 BR-05 March 2024 BR4 Type of Stormwater Management Measure Bioretention System with Underdrains (Northeast Area) Bioretention System with Underdrains (Middle East Area) Bioretention System with Underdrains (Southeast Area) Bioretention System with Underdrains (South Area) Bioretention System with Underdrains (Southwest Area) Stormwater Management Measures Maintenance Plan & Field Manuals Page 3

Description of Stormwater Management Measures Small Scale Bioretention System with Underdrains Design Storms including Adjustment Factors for Current and Future Events: Design Purposes: o Water Quality 1.25 inches in 2 hours o 2-year storm - 3.42 inches o 10-year storm - 5.20 inches o 100-year storm – 8.71 inches o Current 2-year storm – 3.45 inches o Current 10-year storm - 5.36 inches o Current 100-year storm – 9.23 inches o Future 2-year storm – 4.07 inches o Future 10-year storm – 6.34 inches o Future 100-year storm - 11.58 inches March 2024 Stormwater Management Measures Maintenance Plan & Field Manuals Page 4

Preventative and Corrective Maintenance Action Plan As per N.J.A.C. 7:8-5.8(b) & (e), preventative and corrective maintenance shall be performed to maintain the function of the stormwater management measure, including, but not limited to, repairs or replacement to the structure; removal of sediment, debris, or trash; restoration of eroded areas; snow and ice removal; fence repair or replacement; restoration of vegetation; and repair or replacement of non-vegetated linings. The maintenance of access points to the stormwater management measures shall be in accordance with the following: - all components of the stormwater management measures must be readily accessible for inspection and maintenance; - trees, shrubs, and underbrush must be pruned or trimmed as necessary to maintain access to the stormwater management measures via provided gravel paths outside of the station perimeter walls to allow for the inspection and control of mosquito breeding. Preventative Maintenance Actions The frequency of the preventative maintenance actions listed here is adopted from Chapter 9, BMP Manual of Structural Stormwater Management Measures. Design engineer and responsible party should adjust the frequency of preventative maintenance actions according to the situations of the stormwater management measures in the development. Frequency Preventative Maintenance Actions Quarterly Sediment, trash and debris removal, inspecting of manholes and Outlet Control Structures and associated grates/screens/ trash racks. Vegetation quality inspection (one per growing and one per non-growing seasons); Inspection of planting bed (twice a year); Basic Structural Inspection; Cleaning and verifying Infiltration Rate; Vegetation erosion, scour and unwanted growth inspection Debris and sediment inspections after every 1” or greater rain event; trimming. SemiAnnually Annual Unscheduled March 2024 Stormwater Measures/ No. Bioretention System with Underdrains Bioretention System with Underdrains Bioretention System with Underdrains Bioretention System with Underdrains Stormwater Management Measures Maintenance Plan & Field Manuals Page 5

Corrective Maintenance Actions Depending on many factors, such as the performance of preventative maintenance actions, weather, or unexpected incidents, corrective maintenance requirements may not be precisely anticipated; however, a list of potential corrective maintenance actions is shown below. Potential Corrective Maintenance Actions Example of corrective maintenance tasks - Repair/replacement of damaged PVC items - CCTV for inspection of piping - Backflush of the underdrain - Sediment and trash removal in filtration media - Removal of any blockages or debris build-up in the bioretention basin Example of corrective maintenance tasks - Evaluate storage bed components & groundwater levels - Removal of mud or sediment from filtration media - Removal of unwanted vegetation March 2024 Stormwater Management Measures/No. Bioretention System with Underdrains Bioretention System with Underdrains Stormwater Management Measures Maintenance Plan & Field Manuals Page 6

Inspection and Logs of All Preventative and Corrective Maintenance As per N.J.A.C. 7:8-5.8(f), the person responsible for maintenance shall maintain a detailed log of all preventative and corrective maintenance for the structural stormwater management measures incorporated into the design of the development, including a record of all inspections and copies of all maintenance-related work orders. As per NJDEP BMP Manual Ch. 8 (Feb, 2004), a maintenance plan shall include a schedule of regular inspections and tasks, and detailed logs of all preventative and corrective maintenance performed on the stormwater management measure, including all maintenance-related work orders. The person with maintenance responsibility must retain and, upon request, make available the maintenance plan and associated logs and other records for review by a public entity with administrative, health, environmental, or safety authority over the site. Inspection Checklists in the Field Manual for the stormwater management measures on this site include: - Field Manual for Small-Scale Bioretention Systems with Underdrains The logs of all inspections, and both preventative and corrective maintenance performed should be attached in the “Maintenance Logs and Inspection Records” section. See Part II of the Maintenance Plan March 2024 Stormwater Management Measures Maintenance Plan & Field Manuals Page 7

Maintenance Personnel, Equipment, Tools, and Supplies As per NJDEP BMP Manual Ch. 8 (Feb. 2004), maintenance plans should include equipment, tools, and supplies necessary to perform the various preventative and corrective maintenance tasks specified in the plan. Sources of specialized, proprietary, and nonstandard equipment, tools, and supplies should also be provided. Maintenance Personnel/Equipment/Tools/Supplies Personnel/Equipment/Tools Name General maintenance crew Debris removal tools Crow bar Tape measure Quantity 1 2 2 1 Specialized, proprietary or nonstandard equipment, tools and supplies, if applicable Name of the specialized, proprietary or Source nonstandard equipment, tools and supplies JetVac truck (w/ high pressure nozzle) DigVac Rentals Vacuum Sweeper DigVac Rentals Infiltration Testing ????? *For instructions on how to perform maintenance and cleaning on the underground detention basin see the respective Maintenance Guide in the Documents section of the report. March 2024 Stormwater Management Measures Maintenance Plan & Field Manuals Page 8

Cost Estimate Cost Overview Cost Type General cost for quarterly maintenance (sediment, trash, and debris removal) General cost for annual maintenance General cost for unscheduled maintenance Cost Details $1,045 Table A $2,255 Table B $500 Table C Total cost $3,800 Table A: General cost for quarterly maintenance Cost Type Personnel Crew-Site Cleanup Required Quantity Unit Price Cost 1 $500 $500 Equipment Truck 1 $200 $200 Services Disposal 1 $250 $250 Subtotal $950 Overhead $95 Total Cost $1,045 March 2024 Stormwater Management Measures Maintenance Plan & Field Manuals Page 9