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NPCA Stormwater Manual – Appendices - Niagara Peninsula ...

NPCA Stormwater Manual – Appendices - Niagara Peninsula ...

Stormwater Management, Erosion and Sediment Policies and Criteria Niagara Region and Niagara Peninsula Conservation Authority – DRAFT Q18 years produce the highest rate of accumulation after the facility is constructed. This period corresponds in most cases with active construction activities in the catchment (Town of Richmond Hill, 2006). The purpose of the erosion guidelines for construction sites is to provide developers, contractors and review agencies with a set of practical methods for ensuring that urban construction is carried out in such a manner that a minimum amount of soil is eroded from the site and deposited in downstream watercourses. An approach municipalities may take to resolve this issue includes requiring the builder to place securities to maintain the control measures stipulated in the plan and having the builder provide a street, catch basin, or pond cleaning program. 1.22 Development Monitoring of SWM Facilities See Section 12.0 for information on Approvals. 1.23 Assumed SWM Facility Monitoring and Maintenance Programs Several SWM policy and design guidelines for municipalities within the Niagara Region and the NPCA watersheds require that, as part of a SWM report submission, operation and maintenance manuals were required. The policies requested that the proponent provide sediment maintenance schedules before the facility would be assumed by the municipality. The policies also provided some standard maintenance activities and corresponding frequency. There was some reference in the policies and standards reviewed to inspection, monitoring, and maintenance requirements for facilities assumed by the municipality. 1.23.1 Trends and Advances Many municipalities implement routine inspection, monitoring and maintenance programs to ensure that the facilities are functioning as intended and that they are meeting the conditions of their Approval to Operate. The programs provide procedures for sediment monitoring, inspection procedures and water quality sampling of SWM facilities and receiving streams. Continuous flow loggers or depth loggers are also used to record permanent pool depths and hydraulic performance. The procedures often outline the staffing and equipment needs, methods, required records and environmental consequences. Maintenance and monitoring programs may involve creating a database of all existing assumed SWM facilities that can be routinely updated and used to prioritize SWM facility maintenance. To prioritize the maintenance work, the proponent should develop a system to prioritize maintenance work for facilities that the municipality owns and operates. • Recommend that all municipalities develop a maintenance and monitoring program for all existing and future SWM facilities including a list of criteria for prioritizing maintenance; and • All SWM facilities should be monitored after assumption to ensure continued hydrologic and hydraulic performance and meeting the conditions of the approval to operate. 1.24 Maintenance and Monitoring of Private SWM Facilities Refer to Section 16.3 and Appendix T for by-laws regarding maintenance and monitoring requirements for SWM facilities on private lands.

Stormwater Management, Erosion and Sediment Policies and Criteria Niagara Region and Niagara Peninsula Conservation Authority – DRAFT Q19 1.25 Redevelopment and Infilling Municipalities, such as the Town of Fort Erie, have developed separate policies to deal with redevelopment and infilling for areas not subject to a subdivision agreement or site plan control. These policies ensure, for example, that the grading for the new development or redevelopment is compatible with the adjacent lands. The Town of Grimsby has policies that require consideration of water quality controls on a site specific basis. If quality controls are not feasible, then the town may consider contributions in the form of a cash-in-lieu policy. The Town has prepared a Master Storm Water Quality Plan to identify stormwater retrofit locations to apply funds that were collected as cash-in-lieu. Section 1.14 this appendix provides policy direction regarding cashin-lieu policies. Section 6.4 provides examples of SWM control techniques typically used for redevelopment and infilling situations. The Places to Grow Act notes that “Municipalities are encouraged to implement and support innovative SWM actions as part of redevelopment and intensification”. These policies also provide the opportunity to consider SWM for development and redevelopment that is exempt from site plan control. SWM quantity and quality controls should be considered when redevelopment or infilling is proposed. When redeveloping a site, consider how SWM will be incorporated early in the design process to ensure adequate space has been reserved to provide an acceptable level of control. The ultimate outlet for the drainage system should be the deciding factor as to what level of treatment is required. Section 13.4 provides further direction on how to determine the appropriate level of treatment based on the sensitivity of the receiving system. If the sensitivity of the receiving system is unknown, the level of treatment should meet levels set in the Sewer Use By-law or to the satisfaction of the municipality and NPCA. 1.26 Retrofit Studies Refer to Section 5.7 details on retrofit studies 1.27 Site Plan Control Municipalities pass site plan control by-laws to designate site plan control areas. The by-law defines which development types are subject to site plan control which typically include industrial, commercial, institutional, and multiple residential units in excess of a defined number of units. The following is a synopsis site plan control developed by the Puget Sound Action Team (2005). Site plan control is required for both new development and redevelopment and exceptions are typically placed on low density residential or building additions less than a specified surface area. The site plan control is important in that it helps to ensure that the goals and objectives of the OP are reflected in development and redevelopment. Site plan control provides the opportunity to ensure that OP policies such as ‘opportunities for innovative SWM design’ are being considered as part of the site design. Many municipalities have developed site plan control manuals that outline the need for preliminary development meetings to discuss proposed projects, the approval process, and the required elements of the submission. SWM reports are required. There are however, other things the municipality could request to ensure that stormwater is being planned to maximize water quality and quantity controls. Site plan design provides the opportunities to consider and implement innovative SWM design. New developments and redevelopments could integrate

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