STAFF REPORT

January 26, 2000

To: Works Committee

From: Barry Gutteridge, Commissioner, Works and Emergency Services

Subject: Wet Weather Flow Management Master Plan - Work Plan

All Wards

Purpose:

To receive and approve the attached Work Plan and Work Plan Schedule for the Department of the City of Toronto Wet Weather Flow Management Master Plan.

Financial Implications and Impact Statement:

It is estimated that $4,000,000.00 will be required to undertake the development of the Wet Weather Flow Management Master Plan over a two year period. Funding in the amount of $1,023,000.00 has been approved in the 1999 Water and Wastewater Capital Works Program, Water Pollution Control, under Sewer System Improvements, Project No. WP250 and an additional $932,000.00 has been requested in the 2000 Water and Wastewater Capital Works Program under WP953, Stormwater Management. The estimated balance of $2,045,000.00, will be requested through the 2001 Water and Wastewater Capital Works Program. However, given recent developments related to the TO Bid for the 2008 Olympics and the Waterfront Revitalization Task Force (Mayor's Waterfront Vision), and the recognition that this project advances the City's efforts to restore impaired beneficial uses of the waterfront and watersheds identified in the Federal/Provincial Remedial Action Plan for Toronto, staff are investigating funding opportunities through the Federal and Provincial levels of government.

Recommendations:

1. The attached Work Plan Summary and Work Plan Schedule for the Development of the City of Toronto Wet Weather Flow Management Master Plan be received and approved;

2. The Commissioner of Works and Emergency Services investigate additional funding opportunities from the Federal and Provincial levels of government to support the development of the Wet Weather Flow Management Master Plan;

3. The Commissioner of Works and Emergency Services report to the Works Committee before the 2001 Water and Wastewater Capital Works Program is submitted with a progress report on the development of the Wet Weather Flow Management Master Plan and a revised estimate for the funding necessary to complete the development of the Plan.

Background:

At it's meeting of May 11 and 12, 1999, Toronto City Council, by adoption of recommendations embodied in Clause No. 2 of Report No. 7 of the Works and Utilities Committee, requested the Commissioner of Works and Emergency Services to report back to the Committee when a work plan for the Step 2 (Development Phase) of the Wet Weather Flow Management Master Plan had been completed.

The Wet Weather Flow Management Master Plan, developed through a strategic planning process will formulate strategies for the prevention, control and reduction of wet weather flow impacts. Wet weather flow quantity and quality issues are to be managed on a watershed basis to enhance and preserve ecosystem health through a hierarchy of source, conveyance and end-of-pipe controls and/or treatment measures. The Wet Weather Flow Management Master Plan will include an implementation plan for the strategies and will define the monitoring programs necessary to measure the effectiveness of the strategies as they are implemented.

The development of the Wet Weather Flow Management Master Plan will follow the planning principles of the Environmental Assessment Act as detailed in the Class Environmental Assessment for Municipal Water and Wastewater Projects (Class EA). Where individual projects are identified, the Master Plan will satisfy the requirements under Phase I (Problem Definition) and Phase II (Conceptual Alternatives) of the Class EA process, where feasible. The implementation of the Master Plan may require project specific work to satisfy the next appropriate phase of the Class EA process.

Comments:

The Development Phase of the Wet Weather Flow Management Master Plan was initiated subsequent to the City Council meeting of May 11 and 12, 1999 in which Council adopted the recommendations of the March 25, 1999 Works and Utilities Report on the "Wet Weather Flow Management Master Plan". As per Recommendation No. 3 of the Report, a Project Steering Committee was formed to advise the Commissioner of Works and Emergency Services on the development of the Master Plan. Consistent with the Recommendation, the 24 member Steering Committee includes 2 City Councillors (Councillors Ila Bossons, Jack Layton and Bill Saundercook on an alternating basis), 12 public representatives including 2 representatives from the Main (Ashbridges Bay) Treatment Plant Environmental Assessment Implementation and Compliance Monitoring Committee, 6 staff from the Works and Emergency Services Department, Urban Planning and Development Services and the Economic Development, Culture and Tourism Department, and 4 agency staff from the Ontario Ministry of the Environment, Ontario Ministry of Natural Resources, the Toronto and Region Conservation Authority and the Waterfront Regeneration Trust. The General Manager of the Water and Wastewater Services Division currently chairs the Steering Committee. The Steering Committee has been meeting since August 1999. The Steering Committee has been involved in the development of and has approved the Work Plan Summary (Attachment 1) and accompanying Work Plan Schedule (Attachment 2). The Committee has requested that the Plan maintain flexibility, particularly in the areas of technologies to be considered in the remedial options phase.

Recent developments related to the TO Bid for the 2008 Olympics and the Waterfront Revitalization Task Force (Mayor's Waterfront Vision) provide a more urgent impetus for the development of the Wet Weather Flow Management Master Plan. Both initiatives have assumed improvements to waterfront water quality which must be derived through wet weather flow management. It is important therefore, that the water quality initiatives contemplated under the Master Plan for the Olympics and the Waterfront Revitalization Task Force be closely coordinated through the Wet Weather Flow Management Master Plan process.

There is an expectation that implementation of the Wet Weather Flow Management Master Plan will reduce or eliminate the adverse impacts from storm sewer and combined sewer overflows to the waterfront and area watercourses. However, both initiatives assume an implementation schedule that is more aggressive than originally envisioned. The "Master Plan for the Olympics", for example, assumes that these improvements will be achieved in advance of the 2008 Olympics. Furthermore, members of the Steering Committee have strongly recommended that the Wet Weather Flow Management Master Plan be developed over a short time-frame, some suggesting as short as one year. However, this time-frame is considered inappropriate given the many data gaps which must be addressed to undertake the analysis required and the subsequent level of effort required to analyse the various options available and then develop the preferred strategy for implementation. For these reasons, the Work Plan Schedule extending over a two year period provides an appropriate compromise which could be accommodated with assistance through contract assignments. As summarized in the attachments, the Wet Weather Flow Management Master Plan would be developed in accordance with the Class Environmental Assessment requirements and incorporate broad public consultation through all aspects of the development. The two year schedule assumes, however, a relatively smooth and unimpeded process.

Key elements of the Work Plan include the following:

a) development of a harmonized Stormwater Management Policy

b) development of Funding Mechanisms for Wet Weather Flow Management Master Plan Implementation

c) development of the Wet Weather Flow Management Master Plan:

i) public consultation

ii) target setting

iii) data gathering

iv) field data collection

v) receiving water modelling for lake, rivers and streams

vi) simplified hydrologic modelling of existing conditions

vii) detailed hydrologic/hydraulic modelling and opportunity assessment for separated sewer systems within the six watersheds and the combined sewer service area

viii) development of remedial options: source control, conveyance system,

open space and natural systems, and

end-of-pipe opportunities

ix) sanitary sewer system infiltration/inflow control

x) development of preferred strategy and implementation schedule

xi) preparation of draft Plan

xii) preparation of the final Wet Weather Flow Management Master Plan

The accelerated schedule proposed will require external assistance through contract assignments. Thus, the estimated cost to complete the Wet Weather Flow Management Master Plan has been revised accordingly from $2,500,000.00 to $4,000,000.00. While funding is available to undertake the work identified in the first year, additional funding will be required in 2001 to complete the analysis required. In the two year schedule provided, most of the data gathering, computer simulation model development and wet weather flow management opportunity assessment will be undertaken in 2000. The more detailed system analysis, development and selection of remedial options, development of the preferred strategy and implementation schedule and most of the preparation of the draft Master Plan report will be undertaken in 2001.

For the reasons stated above, and the recognition that this project advances the City's efforts in restoring the impaired beneficial uses of the waterfront and watersheds identified in the Remedial Action Plan for Toronto, the support for an accelerated Master Plan development schedule extends through to the Provincial and Federal governments. Staff are exploring opportunities that may exist to secure funding contributions from all levels of government, and will report back on these opportunities at an appropriate time.

Conclusions:

A Work Plan and Work Plan Schedule for the development of the City's Wet Weather Flow Management Master Plan have been prepared with input from and approved by the Wet Weather Flow Management Master Plan Steering Committee. The development of the Master Plan will follow the planning principles of the Environmental Assessment Act as detailed in the Class Environmental Assessment for Municipal Water and Wastewater Projects and incorporate broad public consultation through all aspects of the Plan development.

Recent developments related to the TO Bid for the Olympics and the Waterfront Revitalization Task Force (Mayor's Waterfront Vision) present an urgent impetus for the development of the Master Plan. Both initiatives have assumed timely improvements to waterfront water quality which must be derived through wet weather flow management. Similarly, members of the Steering Committee have recommended an aggressive Plan development schedule. However, the two year schedule proposed provides an appropriate compromise given the many data gaps which must be addressed and the subsequent level of effort required to undertake the analysis and develop the preferred strategy for implementation. However, external assistance through contract assignments will be required to accommodate this advanced schedule resulting in an increase in the estimated cost to complete the development of the Master Plan from $2,500,000.00 to $4,000,000.00. Under this schedule, most of the data gathering, computer simulation model development and wet weather flow management opportunity assessments are to be undertaken in 2000. The more detailed system analysis, development and selection of remedial options, development of the preferred strategy and implementation schedule and most of the preparation of the draft Master Plan report will be undertaken in 2001.

For the reasons stated above, and the recognition that this project advances the City's efforts in restoring the impaired beneficial uses of the waterfront and watersheds identified in the Remedial Action Plan for Toronto, the support for an accelerated Master Plan development schedule extends through to the Provincial and Federal governments. Accordingly, staff are exploring opportunities that may exist to secure funding contributions from all levels of government.

Contact:

Mr. M. D'Andrea, P. Eng.

Manager, Infrastructure Asset Management

Telephone (416) 397-4631

Fax (416) 392-3974

E:mail: mdandre@toronto.ca

Michael A. Price, P. Eng., FICE

General Manager

Water and Wastewater Services

Barry H. Gutteridge

Commissioner

Works and Emergency Services

Attach.

C331

Attachment 1

WET WEATHER FLOW MANAGEMENT

MASTER PLAN DEVELOPMENT

WORK PLAN SUMMARY

(January 24, 2000)

· Development of Harmonized City Stormwater Policy

· Development of Funding Mechanisms for Wet Weather Flow Management Master Plan Implementation

· Development of Master Plan

· Data Gathering

· Hydrologic Modelling

· Target Setting

· Assessment of Remedial Options for Separate Storm Sewers System by Watersheds

· Assessment of Remedial Options for Combined Sewer Service Area

· Sanitary Sewer System Infiltration/Inflow Control

DATA GATHERING

· Sewer Outfall Locations - Pipe Sizes

· Sewer Infrastructure Data: - physical

- Condition rating (2600 outfalls)

· Land Use Mapping

· Lot Fabric Mapping: - Lot Line & Building Footprint

· Existing Runoff Coefficient Determination

· Building Construction History Determination:

- Roof leader connections

- Foundation drain connections

· Hydrogeology and Surfical Geology Mapping

· Lot Grading Mapping

· Groundwater Mapping/Modelling

· Land Ownership: - Public Lands

· Basement Flooding: - Mapping of Problem Areas

· Sewer Design Standards Identification

· Infiltration & Depression Storage Potential Mapping

· Existing SWM Facilities: - Mapping & Design Details

· Watercourse Flood Plain Mapping

· Watercourse Condition Inventory

ANALYSIS OF EXISTING CONDITIONS

Step 1(a) Hydrologic Modelling

· separate by watershed and discretization of existing sewersheds representing existing physical attributes/conditions

· develop hydrology computer simulation models

· "ground truth" predictions from representative sewer sheds with available data

· assess each event flow prediction over an average hydrologic year and compute appropriate statistics e.g. total annual, peak event & average event flows

· assess contaminant load by event and by average hydrologic year

Step 1(f) Target Setting

· assessment of existing environmental degredation of receiving waters (ideally by watercourse reach and waterfront section)

· determination of appropriate flow and water quality targets (ideally by watercourse reach & waterfront section)

Step 2(a) Assessment of Remedial Options for Separated Storm Sewer System by Watershed

· develop detailed system hydrologic/hydraulic models

· develop, where necessary, receiving water models

Source Control Opportunities, Options and Analysis

(i) assess source control opportunities and determine expected effectiveness

(ii) compare against targets

(iii) identify potential implementation schedule, cost & cost-effectiveness

Conveyance System, Open Space & Natural System Opportunities, Options and Analysis

(i) assess conveyance system & open space opportunities and determine expected effectiveness

(ii) compare against targets

(iii) identify potential implementation schedule, cost & cost-effectiveness

End-of-Pipe Opportunities, Options and Analysis

(i) assess end-of-pipe opportunities and determine expected effectiveness

(ii) compare against targets

(iii) identify potential implementation schedule, cost & cost-effectiveness

Development of Preferred Strategy and Implementation Schedule

- Selection of preferred options and development of an Implementation Schedule with public and approving agency input

- Monitoring plan to be developed to track effectiveness of plan implementation

Step 2(c) Assessment of Remedial Options for Combined Sewer Service Area

· develop detailed system hydrologic/hydraulic models

· develop, where necessary, receiving water models

Source Control Opportunities, Options and Analysis

(i) assess source control opportunities and determine expected effectiveness

(ii) compare against targets

(iii) identify potential implementation schedule, cost & cost-effectiveness

Conveyance System, Open Space & Natural System Opportunities, Options and Analysis

(i) assess conveyance system & open space opportunities and determine expected effectiveness

(ii) compare against targets

(iii) identify potential implementation schedule, cost & cost-effectiveness

End-of-Pipe Opportunities, Options and Analysis

(i) assess end-of-pipe opportunities and determine expected effectiveness

(ii) compare against targets

(iii) identify potential implementation schedule, cost & cost-effectiveness

Development of Preferred Strategy and Implementation Schedule

- Selection of preferred options and development of an Implementation Schedule with public and approving agency input

- Monitoring plan to be developed to track effectiveness of plan implementation

Step 2(f) Sanitary Sewer System - Infiltration/Inflow Control

(i) analyse existing sanitary sewer flow data to determine areas with higher than expected Infiltration/Inflow

(ii) follow-up with more detailed flow monitoring & CCTV inspections & dye testing

(iii) identify Infiltration/Inflow sources

(iv) identify remedial options with implementation schedule, cost & cost-effectiveness

Development of Preferred Strategy and Implementation Schedule

- Selection of preferred options and development of an Implementation Schedule with public and approving agency input

- Monitoring plan to be developed to track effectiveness of plan implementation