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Phase 2
Commencing
in the spring of 2007, Phase 2 focuses on the completion of the delineation
of intake protection zones (IPZs) and identification of drinking water
threats. At the conclusion of Phase 2 in December 2008, the partners in
the Collaborative will have:
- Identified
the key threats and significant issues at the Collaborative partners'
drinking water intakes,
- Completed
a semi-quantitative risk assessment for each intake,
- Refined
the preliminary IPZ-2s developed in Phase 1 for each intake based on
a 2-hour time of travel, and
- Initiated additional
studies with respect to pathogen monitoring and data management.
1.
Key Threats and Significant Issues
To meet
this objective, specific tasks will be undertaken following Ministry
of the Environment guidance including:
- Refined loading
calculations including loadings during peak events for priority watershed
tributaries (as identified from previous work). This task will be completed
as part of the Phase 2 Watershed Pollutant Loadings Sub-Study.
- Identification
and quantification (as practical) of key threats (e.g., manure storage
areas, CSOs, storm drains, wastewater bypasses, and treated industrial/municipal
wastewater discharges) along the whole of these watersheds.
- Identification
and quantification (as practical) of significant discharges directly
to the lake with a particular focus on discharges within one of the
IPZ-2s established in the Phase 1 research.
- Review and analysis
of existing water quality data for each water intake and research the
sources of the contaminants found.
- Comparison of the
water quality data from the intakes (present and historical) with the
Ministry of Environment's threats database to establish priority issues.
- Identification
of gaps in the available information (e.g., winter and extreme conditions
data, current data, pathogen data).
2.
Semi-Quantitative Risk Assessment
A semi-quantitative
risk assessment will be conducted first for those risks that are common
to all intakes and then applied to site-specific risks in accordance with
the Ministry
of the Environment's Guidance Module 6: Water Quality Risk Assessment.
3.
IPZ-2 Refinement
The preliminary
IPZ-2s delineated in Phase 1 will be refined in the Phase 2 research based
on a 2-hour time of travel. This will be accomplished by:
- Improving the lake-wide
circulation input to the current modeling of the IPZ-2s,
- Conducting a detailed
statistical assessment of boundary conditions, and
- Taking into consideration
other data gaps identified in Phase 1 and focusing on extreme conditions
(e.g., maximum flows in tributaries and sewers, winter conditions, the
presence of a strong thermal bar and potentially the strong upwelling/downwelling
in Lake Ontario).
4. Additional Studies
A special initiative
in Phase 2 will be the development of a pathogen monitoring plan to address
the lack of data on pathogens in Lake Ontario.
A second special initiative
will be the examination and implementation, as practical, of an effective
data management system.
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