The Town of Richmond Hill, along with R&M Construction, EXP Services Inc., and TMIG, were the proud recipients of the 2018 Public Works Project of the Year Award (Environment, $2-$10 Million Category) for the Elgin Mills Greenway project at the OPWA Annual Conference and Awards Luncheon held on January 24th, 2019. Congratulations team!
The Elgin Mills Greenway is an open space that is part of a trail destination system in the Town of Richmond Hill that is connected to a tributary of the East Don River. The area had been severely impacted by erosion from uncontrolled storm runoff that was discharged from two storm outfalls at the north limit of the Greenway near Shaftsbury Avenue, where it flowed uncontrolled to an existing on-line stormwater management (SWM) pond south of the Elgin West Community Centre. Erosion in this system had completely undermined a section of trail adjacent the channel and a pedestrian bridge over the channel. A temporary trail was constructed in 2015 to restore the trail connection to Shaftsbury Avenue, and the pedestrian bridge was removed as part of a larger construction project to temporarily protect the eastern storm outfall at Shaftsbury Avenue against undermining due to erosion.
The material eroded from the channel was accumulating in the on-line SWM pond, impairing its performance for water quality treatment and potentially for flood control. There was considerable scour and erosion at the outlet of a third storm outfall connected to the on-line pond, as well as at the facility’s outlet.
TMIG was retained by the Town of Richmond Hill to complete a Municipal Class Environmental Assessment (EA) for the rehabilitation of the Elgin Mills Greenway, and subsequently completed the detailed design for retrofit of the stormwater management infrastructure within the Elgin Mills Greenway.