Toronto's Alternative Design Delivery Strategy Helps Solve Challenges to Rehabilitating the Secondary Treatment Process

Originally constructed in the 1950's, the City needed to rehabilitate the secondary treatment system at Humber Treatment Plant to a state of good repair. The City developed a unique program management approach where the consultant was required to help the City develop and refine the project's scope, develop a contracting strategy, and provide overall coordination for implementing the resulting construction contracts. The engineering fees would be based on a percentage of the capital cost of the project. This approach allowed the scope of work to evolve without needing to seek council approval, reduced the schedule by two years compared to the City's traditional approach for engineering assignments. The overall project was divided into three different contracts, which allowed the City to proceed with a smaller upgrade to the North Plant Primary Clarifiers followed by upgrades to the South Plant, and finally upgrades to the North Plant if the budget allowed.