HomeMy WebLinkAboutEnv 2009-09-17 - Doon South Pumping Station Class Environmental AssessmentDoon South Pumping Station Class EA
Executive Summary
The City of Kitchener is responsible for operating and maintaining the sanitary sewer networks
and pumping stations within it’s’ boundaries. The City’s 2004 Development Charge Background
studies have identified the need to establish new sanitary sewer pumping station(s), trunk
sewer(s) and forcemain(s) to provide wastewater servicing for the Doon South Community Plan
area.
The primary goal of this assignment was to identify and define a publicly acceptable solution
which will provide the developing Doon South Phase II Community within the approved Urban
Boundary and any future developments, with a means of delivering their sanitary wastewater to
the Region of Waterloo’s, Kitchener Wastewater Treatment Facility.
This study has been completed as a Schedule “B” Class Environmental Assessment in
accordance with Municipal Engineers Association document “Municipal Class Environmental
Assessment, October 2000, as amended in 2007”.
The purpose statement for the Doon South Pumping Station Class EA is defined as follows:
The City is preparing a development strategy for the development of the Doon South
Planning area in the City of Kitchener. This study will consider current system capacities,
future service area demands and future growth strategies;
With input from the general public and interested stakeholders, the City of Kitchener is
developing a sanitary sewer strategy for the design of a sanitary sewer pumping station(s)
that will accept flows from the local catchments and deliver the flows through a forcemain(s)
to an existing or proposed sanitary sewer system so that flow can be transported to the
Kitchener Wastewater Treatment Plant;
The design and location of the sanitary sewer pumping station will be designed in a manner
which:
Protects human health and property;
Protects and enhances significant aspects of the natural environment;
Addresses current and anticipated regulatory requirements/changes;
Is fiscally responsible;
Provides a collection system of sanitary sewer flows that supports re-
urbanization and targeted Greenfield development within the Doon South
Planning area; and
Provides security of collection systems for future urbanization.
Notice of Commencement
A Notice of Commencement was issued in local newspapers and through direct mail on October
2, 2008.
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Notice of Public Information Centres
The Public Information Centres (PICs), held on Feb 11 and June 23, 2009, were advertised in
advance on the City of Kitchener’s website, as well as twice in the local newspaper.
Notice of Completion
A Notice of Completion, including the compilation of the Doon South Pumping Station Class
Environmental Assessment Study Report and the availability of the draft report for public review
and comment, was published in the local newspaper.
The Phase II lands were originally planned to be developed as "Limited Service Residential" (or
Estate Residential) on individual septic systems rather than City sanitary sewers, as they could
not be serviced by the City's gravity sewer system. The study limits for the proposed pumping
station(s) were expanded to include the lands bounded by Riedel Road to the east, Blair Creek to
the north, New Dundee Road to the south and the South Strasburg Class EA boundary to the
west.
The population projection for Phase II of the Doon South Community Plan is based on a zoning of
“Low Density Residential” with a density of 56 persons per hectare (ppha) resulting in a total
projected population of 18, 615 people. Wastewater flow is based on projected population,
wastewater generation per person and infiltration allowances. The total wastewater generation
from Doon South Phase II Community Plan and additional lands beyond the Urban Boundary is
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approximately 0.211m/s.
Infrastructure Review
A review of the existing infrastructure within and around the Doon South area was undertaken in
an effort to identify a suitable outlet location for the wastewater from the DSPS.
Doon South Trunk Sanitary Sewer
The sewer reach at Doon South Drive and Robert Ferrie Drive transitions from a 375mm dia. Pipe
(capacity 291 L/s) to a 450mm dia. Pipe (capacity 180 L/s).
Homer Watson Pumping Station
The HWPS requires upgrades that include emergency storage. To accommodate one hour of
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wastewater emergency when the rated capacity is 309L/s, an emergency storage tank of 1,120m
is required.
Strasburg Direct Trunk Sanitary
The 2007 Stantec report South Strasburg Gravity Trunk Sanitary Sewer Schedule ‘B’ Class
Environmental Assessment, studied the lands in the southwest quadrant of Kitchener. It
identified the lands to be serviced by a gravity trunk sanitary sewer to the Strasburg Direct Trunk
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Sanitary Sewer. The results from the review by AECOM indicate that sufficient capacity may not
be available. Accordingly, AECOM made the following recommendations to the City:
Further increase the study area for the DSPS to include lands from the South Strasburg
Class EA; or
Conduct dynamic hydraulic modelling of the downstream Strasburg Direct and Pioneer Trunk
Sanitary Sewer Systems.
Identify hydraulic deficiencies, and recommend remedial actions necessary to upgrade the
trunk sewers systems where required.
Guidelines for evaluation criteria have been set out in the Class EA document, Municipal Class
Environmental Assessment, October 2000, as amended in 2007. The key considerations for
wastewater projects have been listed below:
1. Land-Use Planning Objectives
2. Natural Heritage Features
3. Social Environment
4. Cultural Environment
5. Economic Environment
6. Property
The preferred alternative is identified as Alternative 4-1 Option B.
The servicing scenario presents an interim solution and includes upgrades to the HWPS. The
interim scenario includes having Area A1 (capacity approximately 47L/s) serviced by existing
gravity sewer to the HWPS, Accordingly, any combination of lands within the yellow area can be
serviced until a flow of 47L/s is reached at the DSPS or the HWPS reaches its rated capacity of
309L/s.
The ultimate design of the design of the Doon South Pumping Station has sanitary sewage flows
being directed to the Schneider Trunk Sanitary Sewer by 2-300mm dia. forcemains.
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