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3 years ago

NPCA Stormwater Manual – Appendices - Niagara Peninsula ...

NPCA Stormwater Manual – Appendices - Niagara Peninsula ...

Project:

Project: NPCA SWM Policies - 2 - TSH No. 54-22280 Action By - the draft decision tree/flow diagram will need revisions then will be recirculated for comment - how do you determine when COA is required? - large parking areas that are acting as storage facilities with orifice plates (would a COA be required?) - recommend that on each application the MOE is contacted to verify if COA is required. - for private facilities municipalities have to sign off for approval. Action - draft decision tree/flow chart for approval to be revised than circulated to NPCA and committee for review 5.0 Flood & Erosion protection -typical target of 40 m3/ha -use MOEE guidelines in absence of subwatershed study -or insist on a geomorphic study? (general consensus was no) - Sediment & Erosion control (S&E control) is required for all construction sites -sediment control plan is required for all applications (Greenfield, infill, redevelopment) -NPCA looks for consistency but does not specify what is needed - Development adjacent to a watercourse has always required S&E control for environmental reasons - stress the importance of proper S&E control from a maintenance perspective - it was pointed out that not all departments have the opportunity to review building permits and therefore review & comment proposed S&E control plans -developments that are exempt from site control plan process and do not require SWM includes schools and hospitals, S&E control is still required Actions - policy to identify S&E control issues and the need for enforcement - policy should refer to sediment and erosion control standards (i.e. MTO manual, existing draft policies) - recommend that land developer prepare and submit S&E control inspection reports on a routine basis (i.e. bi-weekly) - provide sample S&E control reports in policy appendix TSH TSH Site alternative by-laws QA 081

Project: NPCA SWM Policies - 3 - TSH No. 54-22280 Action By - not all municipalities have site alternative bylaws - all municipalities should have this by-law and the bylaw should address S&E control -depending on how existing bylaws are written they may not apply to S&E control and SWM -the bylaws tend to focus more towards restricting private citizens from filling in ditches or modify lot drainage - Site alteration bylaws should be created or updated to address S&E control (i.e. silt fencing, sediment traps, etc.) - S&E control should also be entrenched in subdivision agreements Actions - Policy should address the need for comprehensive site alteration bylaws and that they should be updated to address S&E control TSH Floodplains -NPCA is actively updating the floodplain mapping within the next 5 years - floodplains – issue – allowing quality (only) - control ponds in floodplains – where quality is not required - now outside system is unofficial policy - floodplain policy is captured elsewhere (CA Act regulation) - pre-past requirements in absence of substantial studies - stay out of 5 year perhaps in the 100 yr. as long as your preserve the stage storage relationships of the floodplain - address flood moderation roles of existing natural features -NPCA indicated that these types of feature (i.e. wetlands, woodlots, etc.) are being identified in separate studies Actions - policy to recognize the need for preservation and important roles these features play in SWM - SWM policies to provide direction on where SWM facilities may be located in floodplains (i.e. outside the 5yr, within the 100yr however must maintain stage storage relationship) TSH 6. Infiltration and Groundwater Protection - reference/include maps that indicate where study is needed to address the SWM approach required (i.e. hydrogeologic assessments) - direction regarding suitable topsoil depths for impervious areas may be provided in the policy -who has responsibility for groundwater? - if infiltration targets can’t be achieved recommend alternative BMP’s Actions - reference groundwater and fisheries maps and include in report - need for further studies when building in groundwater sensitive areas (documentation that proposed SWM facility will not contaminate groundwater, impact fish habitat, etc.) TSH 7. Natural Channel Design, Erosion Control & SWM Aesthetics QA 081

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