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Notice of permit
Regional or Local Number: DFO-17-HCAA-00711
Notice is hereby given that pursuant to the provisions of section 73 of the Species at Risk Act permit no. DFO-17-HCAA-00711 is issued.
Activity affecting the species is incidental to the carrying out of the activity
The replacement of a closed bottom culvert with a new, larger, open bottom culvert, over a tributary of the Rouge River, where Redside Dace is known to be present, is required. These works require site isolation, dewatering activities, and relocation of fishes.
Start Date: 2017-07-01 End Date: 2017-09-15
Issuing Authority: Department of Fisheries and Oceans
- Species at Risk Act
Location of Activity (province, territory or ocean):
a) Alternatives: If the existing culvert is not replaced, deterioration will continue, making the section of the road unsafe for passage. Several residences at the east end of the street would be isolated, resulting in a safety hazard. Replacement of the existing culvert with the same type and size of culvert was considered, as the existing 3.0 m span has adequate hydraulic capacity; however, the existing culvert does not provide any overbank area within the culvert. It was determined that replacement with a larger culvert, incorporating localized channel improvements, would result in an improvement on existing conditions with respect to fish habitat and terrestrial passage. Construction phasing and Erosion and Sediment Control (ESC) measures have been chosen in consultation with the Toronto Region Conservation Authority (TRCA) and the Ontario Ministry of Natural Resource and Forestry (MNRF) to minimize and eliminate potential effects on Redside Dace and downstream habitat, to the greatest extent possible. A temporary flume was chosen over a pump around system to manage flows, while construction proceeds in the dry. It was thought that this would best manage flows through the work area over a multiple-day construction period in the event of storm flows. Sizing of the proposed culvert has been confirmed by a fluvial geomorphic and hydraulic study. Structural alternatives that were considered included closed and open invert culverts. Closed invert options, such as a corrugated steel pipe or precast concrete box culvert, were screened out because an open footing configuration presented a better opportunity for enhancement of the channel and fish habitat. An open footing precast concrete rigid frame culvert was selected over a corrugated steel plate arch on concrete footings because the precast concrete structure has a longer service life. The 75+ year service life of the precast concrete structure mitigates the need for future reconstruction and associated disturbance of the fishery for the greatest extent of all structure alternatives available for this site. A relocation of fishes would be required for this project regardless of the final crossing design. b) Measures to minimize impact: In-stream works are restricted to the Redside Dace timing window of July 1 to September 15 to avoid impacts to the species during spawning. Flow will be maintained during site isolation to ensure water quantity and quality is not affected downstream. Site restoration will be completed, following construction works, to recreate riparian habitat appropriate for Redside Dace at the culvert outlet. Construction phasing and ESC measures have been chosen in consultation with TRCA and MNRF to minimize and eliminate potential effects to Redside Dace and downstream habitat, to the greatest extent possible. The fish rescue will be conducted prior to dewatering of the work area, and will be conducted using methods intended to minimize or eliminate injury or mortality. Temporary disturbances are localized and confined to immediately upstream and downstream of the existing culvert. c) Effects on survival and recovery: There will be a temporary disturbance of fishes rescued from within the isolated work area. There will be a potential short-term reduction in fitness, increased stress, and mortality due to entrapment, capture, and relocation of fishes. The potential impacts to Redside Dace are temporary and mostly due to relocation from an isolated area. The temporary negative impacts will be negated by the long-term increase in overall stream productivity and increased general habitat for the species. It is expected that there will be little, if any, impact to Redside Dace.
Mr. Raymond Ratynski
Regional Manager, Species at Risk Program
Freshwater Institute, Fisheries and Oceans Canada
501 University Crescent
- Date modified: