Island Water Treatment Plant Capacity Increase Study
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Island Water Treatment Plant Capacity Increase Study
- 1. Island Water Treatment Plant Capacity Increase Study Municipal Class Environmental Assessment
- 2. Background Island Water Treatment Plant • One of the City of Toronto’s four water treatment plants • Supplies approximately 20% of the City’s treated water • Built in 1977 • Capacity of 410 million litres per day • Operates 24/7 • Only accessible by ferry or marine transportation • Supplies drinking water to the City’s residents, visitors and businesses • Supplies extremely cold water to the Deep Lake Water Cooling project – Partnership between City of Toronto and Enwave District Energy Limited – Provides air-conditioning to businesses in the downtown core
- 3. Island Water Treatment Plant Island Water Treatment Plant
- 4. Opportunity • City desires to obtain greater operational flexibility by increasing the processing capacity of the Island Water Treatment Plant from 410 mega litres per day (ML/day) to 450 ML/day – This is desired to sustain peak production flows.
- 5. Alternate Solutions 1. Maximize the production capacity and treatment performance of the existing infrastructure at the Island Water Treatment Plant 2. Design and construct additional treatment infrastructure on the Island Water Treatment Plant site 3. Do nothing
- 6. Evaluate Alternate Solutions • Desktop assessment and modelling indicates that increase in capacity can be achieved through maximizing production capacity and treatment performance of existing infrastructure. No construction is necessary. • Do nothing alternative is screened out because it does not realize the opportunity, but is carried forward to provide context for evaluation.
- 7. Least Favourable Neutral Most Favourable Evaluating Alternatives Evaluation Criteria Maximizing production capacity at existing plant Constructing additional treatment infrastructure Do nothing Obj. Achieve 450 ML/d Public Construction impacts (noise, safety risks, etc.) Operating impacts (noise, safety risks, etc.) Environmental Construction impacts Operating impacts (energy use, etc.) Cost Capital Operating TOTAL 20 10 18
- 8. Recommended Solution • Maximizing the production capacity and treatment performance of the existing infrastructure at the Island Water Treatment Plant up to the desired 450 ML/d
- 9. Next Steps • Public consultation: Next steps: 2014 June July August 23 30 7 14 21 28 4 11 18 25 Review recommended solution with public Select preferred solution Notice of completion to agencies and public 30 day review period Start implementation
Editor's Notes
- The Island Water Treatment Plant is one of the City of Toronto’s four water treatment plants. It was built in 1977 and operates 24 hours per day. The plant has a processing capacity of 410 million litres of water per day, supplying approximately 20% of the City’s treated water. The water produced is used as drinking water for the City’s residents, visitors and businesses. Water is also supplied to the Deep Lake Water Cooling project; a partnership between City of Toronto and Enwave District Energy Limited. The Deep Lake Water Cooling project provides air-conditioning to businesses in the downtown core.
- The plant is located on the south side of Toronto Islands, and is only accessible by ferry or marine transportation.
- In order to sustain peak production flows, the city desires to obtain greater operational flexibility by increasing the processing capacity of the Island Water Treatment Plant from 410 ML/day to 450 ML/day.
- Three alternative solutions are being considered: Maximize the production capacity and treatment performance of the existing infrastructure at the Island Water Treatment Plant Design and construct additional treatment infrastructure on the Island Water Treatment Plant site Do nothing
- Feasibility of the three alternative solutions has been studied. A desktop assessment and modelling indicates that the desired increase in capacity can be achieved through maximizing production capacity and treatment performance of the existing infrastructure. This solution would require no construction. The “Do Nothing” alternative is not feasible because it does not realize the opportunity, but is carried forward to provide context for evaluation.
- The alternatives were evaluated using the following criteria: Achieve the objective Construction impacts on the public Operating impacts on the public Construction impacts on the environment Operating impacts on the environment Capital costs Operating costs Both Maximizing production capacity and constructing additional infrastructure would both achieve the objective of inceasing capacity, but doing nothing would not. Maximizing production capacity is favoured over constructing additional infrastructure according to every other criterion.
- The recommended solution is to maximize the production capacity and treatment performance of the existing infrastructure at the Island Water Treatment Plant up to achieve the desired 450 ML/d capacity/
- Next steps: Public comment on the recommended solution: June 19 – July 4 Identify the preferred solution considering comments submitted: July 7 – 18 Finalize the Project File Report and issue the Notice of Completion: July 18 30 day review period: July 21 – August 19 Implement the solution: Beginning end of August