Southwest Transitway Extension Baseline Road to …...Creek The proposed Southwest Transitway storm sewer will be designed in accordance with the appended stormwater management criteria

Southwest Transitway Extension Baseline Road to Norice Street

Environmental Assessment Minor Modification Report

September 2009

Environmental Assessment Minor Modification Report Southwest Transitway Extension – Baseline Road to Norice Street

Ecoplans Limited 10 August 2009

Alternative configurations for Baseline Station were investigated to determine a station footprint compatible with the proposed Algonquin College developments. The proposed configuration consisted of at-grade local station components perpendicular to the grade-separated Transitway and on-line (below-grade) rapid transit station components along the length of the Transitway. This configuration located the local platform directly above and perpendicular to the Transitway, allowing for direct vertical connections between the local and Transitway platforms. The need to construct a centre island LRT platform was also identified so as not to preclude conversion to LRT technology.

Stormwater Management

Concurrently with the preliminary and detail design of the above-noted Stage 2 works, which is presently underway, the City of Ottawa initiated the Pinecrest Creek/Westboro Stormwater Management Retrofit Study in consultation with the National Capital Commission (NCC) and the Rideau Valley Conservation Authority (RVCA). This study was initiated by the City to develop a stormwater management retrofit strategy for the Pinecrest Creek subwatershed in response to the need for a comprehensive approach to mitigate the impacts of runoff from both existing and future development. It includes an integrated geomorphological and hydrological assessment of potential downstream impacts of the proposed Southwest Transitway outlet to Pinecrest Creek with particular emphasis on the section north of the Queensway (Highway 417). It takes an integrated approach to managing potential cumulative stormwater runoff impacts on Pinecrest Creek from planned development including the Algonquin College EDC-CTBS Facility, the SW Transitway Extension, the City’s Archives Building and the Centrepointe Town Centre Redevelopment. Transitway stormwater infrastructure will be installed as part of Stage 2, but will not become operational until such time as the full build out of the Southwest Transitway Extension is completed (in Stage 3). In recognition that Stage 2 would precede the completion of the above-mentioned subwatershed study, stormwater management criteria were developed and documented in the Pinecrest/Centrepointe Town Centre SWM Criteria Study (JF Sabourin and Associates Ltd., final draft, July 2009). The recommended SWM criteria are summarized in a Technical Memorandum (JFSA, June 25, 2009) which is provided in Appendix A and was used to guide the development of a functional drainage plan (See Figure 5). In order to meet these criteria, the functional drainage plan includes a new Southwest Transitway stormwater management system discharging to Pinecrest Creek. Runoff from the Transitway will not be discharged directly to Pinecrest Creek. The detail design of this system will include Best Management Practices for the control of stormwater quantity (such as an underground retention facility, a superpipe, etc…) and quality (such as Oil-Grit Separators, Stormwater interceptors, hydrocyclones, etc…) upstream of the proposed outlet at Pinecrest Creek. This detail design will also address effluent quality monitoring for a 3 year period following the construction and the

Environmental Assessment Minor Modification Report Southwest Transitway Extension – Baseline Road to Norice Street

Ecoplans Limited 11 August 2009

connection of the stormwater management system to Pinecrest Creek, as well as erosion and sediment control measures. Detailed stormwater management design recommendations for the full build-out of the Southwest Transitway Extension (in Stage 3) have been deferred until the aforementioned Pinecrest Creek/Westboro Stormwater Management Retrofit Study, has been completed. This study will expand the approach taken for the SWM Criteria Study to the whole sub-watershed and identify a preferred strategy of retrofit measures to address the ongoing impacts of existing development as well as anticipated future development. Ultimately, Baseline Station will be drained to the Southwest Transitway storm sewer which, as mentioned above, will be designed in accordance with the appended stormwater management criteria and as further refined in the forthcoming subwatershed retrofit study. Runoff from Baseline Station will not be discharged directly to Pinecrest Creek. Stormwater from College Avenue and Navajo Drive will be drained to the Woodroffe Avenue trunk sewer. This connection will follow the municipal roadway stormsewer approval process.

During all construction stages, runoff will be managed in accordance with all applicable regulations, including the City of Ottawa Sewer Use Bylaw (2203-14), City of Ottawa SSP F-1004- Erosion and Sediment Control Plan and Monitoring (both are included in Appendix B) and OPSS 577. The direct discharge of runoff from the construction site will not be permitted without appropriate quality and quantity controls. The Contractor will be required to obtain a sewer discharge permit should they need to pump "dirty water" during construction to combined or sanitary sewers. During detail design of Stage 3, all necessary permits and approvals for the design and construction of the new storm sewer system (including the new outlet to Pinecrest Creek will be sought. We understand that these may include but may not be limited to: an NCC Federal Land Use/Land Transaction/Design Approval; an NCC Land Access Permit; an MOE Certificate of Approval for Stormwater Management Works and; an RVCA Permit issued under Ontario Regulation 174/06 - Development, Interference with Wetlands and Alterations to Shorelines and Watercourses Regulation. Finally, the City of Ottawa is committed to implementing Best Management Practices (BMPs) for the management and treatment of stormwater from the Southwest Transitway. During Stage 3, the details of these BMPs will be developed in consultation with the MOE and will be incorporated into the detail design and Certificate of Approval requirements.

Environmental Assessment Report Southwest Transitway Extension – Baseline Road to Norice Street

Ecoplans Limited 19 June 2009

Design Element

Approved 1997 SWTE IEA

Current Proposal (2008)

Changes to Effects Proposed Mitigation Significance of

Modification

Additional property is quired to

accommodate the westerly shift. The property is owned by the City. The adjacent property is owned by Arnon Corporation.

reArnon Corporation will be apprised of the modification.

Insignificant

The IEA located the local platforms parallel to the Transitway.

The current proposal locates the local platforms perpendicular to the Transitway.

The footprint is compatible with, and complements, the proposed development at Algonquin College.

N/A Benefit

Additional property is required to

ccommodate the westerly shift. The property is owned by the City. The adjacent

operty is owned by non Corporation.

a

prAr

Arnon Corporation will be apprised of the modification.

Insignificant

Footprint

The IEA did not contemplate an LRT platform.

The current proposal identifies the need to construct a centre island LRT platform so that a future conversion is not precluded. This platform will not become operational until such time as EA approval for the conversion to LRT technology is obtained.

The footprint is compatible with, and complements, the proposed development at Algonquin College. This will also ensure minimal disruptions to the College in the future if conversion to LRT is required.

N/A Benefit

Drainage

The IEA approved design drained all station runoff into the Woodroffe Trunk Sewer, outletting into Pinecrest Creek.

All station runoff will be directed into the proposed Southwest Transitway storm sewer pipe system with an outlet at Pinecrest Creek

The proposed Southwest Transitway storm sewer will be designed in accordance with the appended stormwater management criteria

The stormwater management system including appropriamitigation and/or stream rehabilitation measures will be developed during preliminary and detail

te

Minor and Mitigable



Design Element




Modification

Drainage (cont.)

and as further refined in the forthcoming subwatershed retrofit study. This storm sewer will require a new outlet into Pinecrest Creek downstream from the existing outlet. The Southwest Transitway stormwater management system will incorporate Best Management Practices for the control of stormwater quantity and quality (such as an underground retention facility, a superpipe, etc…) and quality (such as Oil-Grit Separators, Stormwater interceptors, hydrocyclones, etc…) upstream of the proposed outlet at Pinecrest Creek. The system design will also address effluent quality monitoring for a 3 year period following the construction and the connection of the stormwater management system

design of stage 3 based on criteria detailed in the June 25, 2009 Technical Memorandum developed by J. F. Sabourin and Associates Ltd. for the City of Ottawa and as further refined in the City’s Pinecrest Creek/Westboro Stormwater Management Retrofit Study (currently underway). Permits and approvals will be obtained including an MOE Certificate of Approval for Stormwater Management Works and an RVCA Permit issued under Ontario Regulation 174/06 - Development, Interference with Wetlands and Alterations to Shorelines and Watercourses Regulation. During all phases of construction, runoff will be managed in accordance with applicable regulations including the City of Ottawa Sewer Bylaw (2203-14), City of Ottawa Standard Special Provision F-1004- Erosion and Sediment Control Plan and Monitoring and OPSS 577. If required, the City will



Design Element




Modification

Drainage (cont.)

to Pinecrest Creek, as well as erosion and sediment control measures. Runoff from the station will not be discharged directly to Pinecrest Creek. The construction of a new storm sewer with an outlet at Pinecrest Creek may require the City to enter into an agreement with the NCC for the use of this land.

enter into an agreement with the NCC for the use of the land including an NCC Federal Land Use/ Land Transaction/ Design Approval and an NCC Land Access Permit. This may require the preparation of a federal screening report under CEAA.

Other No service kiosk/retail space was planned.

The at grade station concourse building can accommodate potential service kiosk/retail space.

This will achieve a positive effect by improving service for passengers and is accommodated in the footprint noted above.

N/A Benefit

TR

AN

SIT

WA

Y

Vertical Alignment

The vertical alignment of the Transitway went from the existing elevation under Baseline Rd, was raised to grade at the station, passed under Tallwood in the south before returning to grade at the intersection of Woodroffe and Norice.

The vertical alignment remains at the existing grade under Baseline Road, has been lowered through the station, passes under Talllwood and returns to grade at the intersection of Woodroffe and Norice.

No new effect other than the grade lowering through the station which is described above.

N/A N/A



Design Element




Modification

Horizontal Alignment

The horizontal alignment ran under the existing structure at Baseline Road and ran approximately 100 m to the west of Woodroffe before re-entering onto bus only lanes on Woodroffe at Norice.

The horizontal alignment still runs under the existing structure at Baseline and follows the same basic route, other than the +/- 30 m westerly shift required to accommodate the station.

No new effect. The horizontal alignment is generally in the same location, except where it veers to the west at the station to accommodate the integrated station and the proposed EDC-CTBS building.

N/A N/A

No ramps were proposed immediately south of Baseline Station.

A pair of one-way (on and off) ramps are proposed south of Baseline station.

Additional property is required to accommodate the westerly shift. The property is owned by the City. The adjacent property is owned by Arnon Corporation.

Arnon Corporation will be apprised of the modification.

Insignificant Ramps connecting Transitway to the local road network

Stage 2 of the implementation plan identified a re-entry ramp to Woodroffe at Norice St.

The current proposal also identifies a re-entry ramp at Norice St.

The footprint is compatible with, and complements, the proposed development at Algonquin College.

N/A Benefit

Drainage

The IEA approved design drained all Transitway runoff into the Woodroffe Trunk Sewer, outletting into Pinecrest Creek.

All Transitway runoff will be directed into the proposed Southwest Transitway storm sewer pipe system with an outlet at Pinecrest Creek.

The proposed Southwest Transitway storm sewer will be designed in accordance with the appended stormwater management criteria and as further refined in the forthcoming subwatershed retrofit study. This storm sewer will require a new outlet into Pinecrest Creek

The stormwater management system including appropriamitigation and/or stream rehabilitation measures will be developed during preliminary and detail design based on criteria detailed in the June 25, 2009 Technical Memorandum developed by J. F. Sabourin and Associates Ltd. for the City of Ottawa and as further refined in the City’s

te

Minor and Mitigable



Design Element




Modification

Drainage (continued)

downstream from the existing outlet. The Southwest Transitway stormwater management system will incorporate Best Management Practices for the control of stormwater quantity and quality (such as an underground retention facility, a superpipe, etc…) and quality (such as Oil-Grit Separators, Stormwater interceptors, hydrocyclones, etc…) upstream of the proposed outlet at Pinecrest Creek. The system design will also address effluent quality monitoring for a 3 year period following the construction and the connection of the stormwater management system to Pinecrest Creek, as well as erosion and sediment control measures. Runoff from the station will not be discharged directly to Pinecrest Creek.

Pinecrest Creek/Westboro Stormwater Management Retrofit Study (currently underway). Permits and approvals will be obtained including an MOE Certificate of Approval for Stormwater Management Works and an RVCA Permit issued under Ontario Regulation 174/06 - Development, Interference with Wetlands and Alterations to Shorelines and Watercourses Regulation. During all phases of construction, runoff will be managed in accordance with applicable regulations including the City of Ottawa Sewer Bylaw (2203-14), City of Ottawa Standard Special Provision F-1004- Erosion and Sediment Control Plan and Monitoring and OPSS 577. If required, the City will enter into an agreement with the NCC for the use of the land including an NCC Federal LandUse/ Land Transaction/ Design Approval and an NCC Land Access Permit. This may require the



Design Element




Modification

The construction of a new storm sewer with an outlet at Pinecrest Creek may require the City to enter into an agreement with the NCC for the use of this land.

preparation of a federal screening report under CEAA.

The width of hard surfaced Transitway in the IEA was +/- 12 m.

The width of the hard surfaced Transitway under the current proposal is +/- 20 m. The additional 8 m is required so as not to preclude the inclusion of LRT tracks at some point in the future.

The amount of impervious surface for the Transitway has increased under the current proposal. This is offset somewhat due to a reduction in imperviousness through the station (greening of the covered portion). As quantity and quality controls were contemplated in the IEA, no new SWM mitigation measures are required.

N/A N/A

Drainage (Continued)

Quality control measures were deemed necessary in this location. Alternatives were evaluated (do nothing, ponds etc). Preferred alternative was not identified.

Stormwater management measures and/ or stream rehabilitation measures will be incorporated as per the recommendations of the City’s Pinecrest Creek/Westboro Stormwater Management Retrofit Study.

None. No effects previously determined.

SWM mitigation measures and/ or stream rehabilitation measures will be developed during preliminary and detail design based on criteria detailed in the June 25, 2009 Technical Memorandum developed by J. F. Sabourin and Associates Ltd. for the City of Ottawa and as further

Benefit – Recommended SWM/stream rehabilitation measures will be developed on a subwatershed basis and will address cumulative impacts.



Design Element




Modification

Drainage (Continued)

refined in the City’s Pinecrest Creek/Westboro Stormwater Management Retrofit Study (Currently underway). Permits and approvals will be obtained including an MOE Certificate of Approval for Stormwater Management Works and an RVCA Permit issued under Ontario Regulation 174/06 - Development, Interference with Wetlands and Alterations to Shorelines and Watercourses Regulation. Mitigation measures for construction-related impacts will also be addressed at this time.

Noise and Vibration

No noise sensitive receivers were identified within the project area. No mitigation measures were anticipated.

No noise sensitive receivers weidentified within the project area. No mitigation measures were anticipated.

re None N/A N/A

MIS

C.

Pedestrian/ Cycling Connections

Existing Accesses and facilities were to be maintained and improved.

Existing accesses and facilities will be maintained and improved.

None N/A N/A

Documents

Southwest Transitway Extension Baseline Road to …...Creek The proposed Southwest Transitway storm sewer will be designed in accordance with the appended stormwater management criteria