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HomeMy WebLinkAbout011 - Appendix I - Storm Water Maintenance Plan JOB NO. B20-069 MONTANA | WASHINGTON | IDAHO | NORTH DAKOTA | PENNSYLVANIA AUGUST 2022 406.586.0277 tdhengineering.com 234 East Babcock Street Suite 3 Bozeman, MT 59715 CLIENT ENGINEER Intrinsik Architecture 106 E. Babcock Street, Suite 1A Bozeman, MT 59715 TD&H Engineering 234 East Babcock Street, Suite 3 Bozeman, MT 59715 Engineer: Cody Croskey, PE ON-SITE STORM WATER MAINTENANCE PLAN 112 EAST MAIN MIXED -USE BUILDING BOZEMAN, MONTANA 112 East Main Mixed-Use Building Storm Water Maintenance Plan B20-069 1 112 EAST MAIN MIXED-USE BUILDING STORM WATER MAINTENANCE PLAN PURPOSE AND INTRODUCTION This maintenance plan identifies the recommended maintenance procedures necessary for the proper function of the on-site storm water management system proposed at the 112 East Main Mixed-Use Building project in Bozeman, Montana. For the purpose of this plan, the site will be 100% covered by building and hardscape with landscaping islands, and the on-site storm water management system includes roof drains and area drains that tie into an alley storm drain system south of the building. The maintenance responsibility for the on-site stormwater management system belongs to the landowner. The landowner may delegate routine inspection and maintenance responsibilities to the on-site facility operations management team or may hire a qualified professional entity or individual to perform certain monitoring and maintenance tasks as necessary. A log shall be kept for all required inspections and maintenance. These logs shall be made available to the City of Bozeman Public Works Department for review as requested. A sample maintenance log is included in the attached Appendix. STORM WATER MANAGEMENT SYSTEM The on-site storm water management system includes roof drains and areas drains that tie into an existing (reconstructed) alley storm drain south of the new mixed-use building. The roof and area drain components are designed to collect, convey, and discharge storm water runoff that is generated on the property to the City’s storm drain system where it passes through an existing public hydrodynamic treatment unit in N. Black Avenue before entering the local waterways. Storm water systems require proper maintenance to prevent sediment clogging, obstruction of inlets, pipes, and structures. Such issues may result in downstream pollution, unpleasant odors, or water damage, and must be mitigated. Scheduled inspections, times of inspections, locations inspected, maintenance completed, corrective actions taken, and any modifications or reconstruction performed shall be documented in the maintenance logs to be readily available upon request. Disposal of accumulated sediment must be in accordance with all applicable local, state and federal regulations. STORM WATER MAINTENANCE PROCEDURES The following maintenance procedures are intended to prolong the life of installed system components and ensure their continued functionality: General Storm Water System Maintenance – 1. Area drains and rooftop landscaping/drains and surfaces should be cleared of leaves and other debris once after primary leaf drop in the fall and once after snow melt in early spring at a minimum. This will minimize the potential for debris to enter the system which could lead to premature clogging of structures, reduced storage capacity, and/or blockage of inlets. 112 East Main Mixed-Use Building Storm Water Maintenance Plan B20-069 2 2. Inspect the roof and area drain inlets, overflow structures, and cleanouts, for sediment build-up or clogging and flush/clear as needed. Inspect for snow/ice buildup at least once weekly during winter months and clear the inlet as needed. Do not pile snow over inlets. 3. Snow storage for ground level and rooftop amenity areas should be performed in designated areas during winter months and should not be allowed to be piled in front of or over drain inlets. Piled snow around or over the inlets could block early snowmelt run- off from entering the system, possibly causing overflows and icy conditions. 4. Sanding of the service area and alley should be done sparingly or avoided completely. Sand or other sediment will likely be washed into the alley storm system components which can lead to buildup and reduced capacity or blockages over time. APPENDIX Sample Maintenance & Inspection Log Storm Water Facilities Inspection and Maintenance Log Facility Name Begin Date End Date Date Location Facility Description Inspected by: Cause for Inspection Exceptions Noted Comments and Actions Taken Instructions: Record all inspections and maintenance for all storm water facilities on this form. Use additional log sheets and/or attach extended comments or documentation as necessary. Save all completed logs in one place and have them readily available for the City of Bozeman’s review upon request.  Location — Specify the exact location of the facility either by its name, facility ID or physical location.  Inspected by — Note all inspections and maintenance on this form, including the required independent annual inspection.  Cause for inspection — Note if the inspection is routine, pre-rainy-season, post-storm, annual, or in response to a noted problem or complaint.  Exceptions noted — Note any condition that requires correction or indicates a need for maintenance.  Comments and actions taken — Describe any maintenance performed and need for follow-up. FIGURE 1FIGURE 1 FIGURE 6