island water treatment plant capacity increase study
DESCRIPTION
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Island Water Treatment Plant Capacity Increase Study
Municipal Class Environmental Assessment
BackgroundIsland 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
Island Water Treatment Plant
Island Water Treatment Plant
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.
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
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.
Least Favourable Neutral Most Favourable
Evaluating Alternatives
Evaluation CriteriaMaximizing 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
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
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