HomeMy WebLinkAboutPLN 01-14 Cal,00 = Report to
1 ' ' Executive Committee
KERING Report Number: PLN 01-14
Date: January 20, 2014
From: Thomas Melymuk
Director, City Development
Subject: Class Environmental Assessment to Address the Outfall Capacity
Limitations at the Duffin Creek Water Pollution Control Plant
- Study Completion and Comments
File: D-8000-044
Recommendation:
1. That Report PLN 01-14 of the Director, City Development, regarding the Class
Environmental Assessment (EA) to address the future capacity limitations of the
existing outfall of the Duffin Creek Water Pollution Control Plant, be received;
2. That Pickering Council advise the Regional Municipalities of Durham and York that
it supports the preferred solution identified through the EA to meet the Ministry of
the Environment requirements for the effluent from the Duffin Creek Plant, as
follows:
(a) modifying the outfall by using all 63 diffuser ports, and fitting the diffuser ports
with new valves that can open and close in response to increased and
decreased flows, to improve effluent mixing; and
(b) revising operations and processes within the Plant to improve the removal
and containment of phosphorous to continue to be within the maximum daily
phosphorus limit as volumes of effluent increase;
3. That Pickering Council request the Regional Municipalities of Durham and York to
revise the "Regions' Commitments" through this EA process by:
(a) replacing the current Commitment to "on-going `voluntary' participation in
and/or support of regional and provincial water quality investigations and
research", to a more proactive and leadership role, establishing a dedicated
annual budget for such research, and engaging in partnerships with
organizations such as the Great Lakes and St.,Lawrence Cities Initiative, the
Ontario Water Works Research Consortium, and the Centre of Excellence for
Great Lakes and Human Health, to find solutions to the water quality issues
affecting the Lake Ontario waterfront in Durham Region; and
(b) adding a new section to the Regions' Commitments to ensure that the future
EA to address wastewater needs beyond the Plant's current limit of
630 Million Litres Per Day will include all necessary components of an EA to
address future outfall capacity limitations, rather than the piecemeal
approach that was followed with the last Plant expansion;
4. That Pickering Council request the Regional Municipalities of Durham and York to
advise the City, and the Ministry of the Environment, of the Regions' response to
Council's request,by letter, by February 9, 2014; and
1
Report PLN 01-14 January 20, 2013
Subject: The Outfall EA Page 2
5. Further, that a copy of Report PLN 01-14 and Council's Resolution on the matter
be forwarded to the Minister of Environment, the Regional Municipality of Durham,
the Regional Municipality of York, and the Town of Ajax.
Executive Summary:
The Regional Municipalities of Durham and York (the Regions), recently completed a
Schedule C Municipal Class Environmental Assessment (EA). Its purpose was to
address how the increasing volumes of treated effluent being released from the
Duffin Creek Water Pollution Control Plant (the Plant) into Lake Ontario, through the
outfall', could meet new restrictions on the content of the effluent and the required
dilution rate. The Outfall EA was required to fulfill an earlier condition of the Minister of
the Environment when allowing the Stage 3 expansion to the Plant. Comments on the
EA are requested by February 17, 2014.
The Regions ran a process with significant consultation and public involvement, peer
reviewers, a Stakeholder's Advisory Committee (SAC) and a dedicated website. City
Development staff followed the process closely and represented the City on the SAC.
Copies of the completed Environmental Study Report (ESR) and supporting studies are
available at the Durham and York Regional offices, Pickering City Hall and Central
Library, Ajax Town Hall and Main Library Branch, as well as on the project website at
www.durham.ca/outfallEA (see Executive Summary from the ESR, Attachment#2).
Staff recommends Council support the preferred solution. The solution includes
changes to the existing outfall to open all 63 diffuser ports and attach valves that can
open and close with increased and decreased flows to improve dilution. It also includes
changes to the processes within the plant to reduce total daily phosphorous output.
Throughout the EA, significant time has been spent on whether another solution (such
as the construction of a new outfall into Lake Ontario) would assist in addressing
significant water quality issues of algae, odours and E-coli that the Ajax waterfront is
experiencing. In fall of 2012, City Council (and Ajax Council) requested that the
Outfall EA timing be delayed to await the outcome of on-going research related to water
quality issues. However, upon further investigation, it was concluded that the topic of
the research was not specific enough to assist with the Outfall EA.
1The "outfall" is the structure that conveys treated effluent from the Plant to
Lake Ontario. The "outfall" consists of both the "main pipe" and the "diffuser". The main
pipe is 3 metres in diameter and extends 1.1 kilometres out under the bottom of Lake
Ontario. Along the last section of the main pipe is the "diffuser". The effluent rises
through many small pipes and mixes with the lake water after exiting nozzle-like
openings, called "diffuser ports" (see Illustration of Outfall, Attachment#1).
2
Report PLN 01-14 January 20, 2013
Subject: The Outfall EA Page 3
The Regions made a number of commitments through the EA. Staff recommends that
Council request the Regions to strengthen these commitments. It is requested that the
Regions become more proactive in leading and coordinating research into water quality
issues (such as those affecting the Ajax waterfront) by partnering with provincial and
international organizations engaged in understanding and addressing water quality
issues. As part of this commitment, the Regions should establish a dedicated annual
budget to support such research and implement best practices in water management.
In addition, it is requested that the Regions commit to combining the EA process for the
future plant expansion with the EA process for any related changes to the existing
outfall (or the need for a new outfall). It is recommended Council request these
Commitments in writing from the Regions.
Financial Implications: None to provide comments.
1.0 Background
1.1 The Outfall EA fulfills a 2007 condition of the Minister of the Environment
In 2007, the Minister of the Environment (MOE) issued a letter responding to
comments on the Environmental Assessment (EA) completed by the Regions of
Durham and York (the Regions) for the Stage 3 Expansion of the Duffin Creek
Water Pollution Control Plant (the Plant). The EA identified a preferred solution to
allow the sewage processing capacity of the Plant to be increased from 420 to
630 Million Litres Per Day (MLD), while meeting new standards for the effluent.
The Minister's letter established many conditions to the Plant expansion, including
several conditions related to the ability of the existing Plant "outfall" to meet stricter
content and dilution standards as the effluent volumes increase. The conditions
required the Regions to initiate another EA to address the outfall capacity
limitations, and until that solution was in place, the Plant capacity is restricted to a
maximum flow of 520 MLD.
1.2 The Outfall EA took three years to complete
In 2010, the Regions initiated a Schedule C Municipal Class EA to address the
future capacity limitations of the existing outfall (the Outfall EA). On
November 19, 2013, the Regions gave notice that the Outfall EA study was
completed. The 90-day comment period ends on February 17, 2014.
•
3
Report PLN 01-14 January 20, 2013
Subject: The Outfall EA Page 4
2.0 Discussion
2.1 Significant public engagement occurred during the EA process
Overall, staff is satisfied that the Regions not only met but exceeded the
requirements for a Schedule C EA process. The EA was informed by a SAC that
included municipal, agency, and public representation. The work of the Regions'
consultants was peer reviewed by other independent experts throughout the
process.
Additionally, Public Information Forums were held (always one each in Pickering
and Ajax) at project milestones, as well as other presentations and meetings with
the SAC and other municipal and agency staff on water quality and process
issues. A project website was established, and a comprehensive ESR was
completed.
2.2 The Regions considered Council's resolution to delay the EA for new
research but concluded against it
City Council passed a resolution on October 15, 2012 (see Attachment#3)
requesting the EA time line be slowed down to investigate whether emerging
research on Great Lakes water quality would assist the Outfall EA. In response,
the Regions investigated the research and held a number of meetings with the
SAC members, and other municipal and agency staff.
It was found that the study design was not specific to the performance to the Duffin
Creek Plant, and thus, would not result in findings that would directly inform the
Outfall EA. The Regions concluded there was no merit in delaying the Outfall EA
for this work.
2.3. There does not appear to be a direct relationship between water quality
problems along the Ajax waterfront and the Plant effluent
The Outfall EA has generated a high level of public interest and participation,
particularly in the Town of Ajax. A concern throughout the EA was whether, and to
what extent, phosphorous or other effluent content from the Plant was leading to
water quality issues (including growth of algae, odours and E-coli) along the Ajax
waterfront. The water quality issues were reducing the value and usability of the
Town's waterfront.
4
Report PLN 01-14 January 20, 2013
Subject: The Outfall EA Page 5
Staff reviewed the information available from a number of sources, including the
ESR, and the Region's project website. Staff concludes a more complex and
interrelated set of factors are contributing to the conditions on the Ajax waterfront.
Thus, any reduction in phosphorous along the Ajax waterfront that may result from
building a costly new outfall extending 3 kilometres off-shore (which was one of the
alternatives the Regions evaluated) may have little affect on the water quality
issues facing Ajax.
2.4 The Regions' preferred solution for the Outfall EA is supported
The preferred solution is a combination of two strategies. The first strategy is to
use all 63 diffuser ports on the outfall instead of only the 38 presently used, and
install on all ports, new valves that can open and close depending on the flows.
This will allow the most efficient exit velocities and mixing characteristics to meet
the minimum required dilution ratio of 20:1 (minimum 20 parts lake water to 1 part
effluent).
The second strategy is to optimize plant operations and enhance phosphorous
•
removal processes by using iron salts and polymer to contain more phosphorus at
two different stages. By containing more phosphorous within the plant, the amount
in the effluent is reduced, allowing the Regions to be within the daily maximum
loading limit for phosphorous of 311 kg/day, as volumes of effluent increase to
630 MLD. (It is noted that with the implementation of the Stage 3 Plant expansion
and enhancements, the daily phosphorus output has been reduced from
240 kg/day in 2008 to 125 kg/day in 2011).
The existing Outfall is currently 35 years old and has about 40 years of useful life
remaining. The Regions' inspection of the Outfall in 2010 showed it to be in good
condition. The solution makes good use of existing infrastructure. The capital cost
to implement the preferred solution is about $1.5 million. This compares with up to
$240 million for a new outfall.
Staff supports the selection of the preferred solution based on the analysis and
evaluation carried out considering technical, natural environment, financial,
social/cultural criteria, and the overall scoring. Implementation of the solution is to
occur prior to the Plant reaching flows of 520 MLD. It is recommended Council
support the preferred solution.
2.5 The Regions should make a stronger"commitment" through this EA to be
more actively engaged in water quality research
While supporting the EA's preferred solution, staff also recognizes the importance
for all stakeholders to be vigilant about reducing phosphorous in Lake Ontario. A
better understanding of the specific circumstances affecting the Ajax waterfront,
and what can be done to address the issues is needed.
5
Report PLN 01-14 January 20, 2013
Subject: The Outfall EA Page 6
The Regions have committed to "voluntarily" participating in regional and provincial
e p 9 9 p
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water quality research and investigations. Staff recommends that Council request
the Regions to take a more proactive and leadership role in having such research
undertaken, including partnering with organizations engaged in Great Lakes water
quality research, and dedicating annual funding to such research and other water
management best practices.
There are a number of organizations that are working on water quality issues such
as the increase of cladophora algae. These organizations include the Great Lakes
and St. Lawrence Cities Initiative, the Ontario Water Works Research Consortium,
and the Centre of Excellence for Great Lakes and Human Health to name a few.
Staff notes that the Region of Durham is already a member of the Great Lakes and
St. Lawrence Cities Initiative. Durham could adopt a Declaration of Sustainable
Municipal Water Management and report publically on progress towards achieving
its objectives for the Lake Ontario waterfront.
Leveraging the experience and resources of these, and other similar
organizations, to address local problems would be an important step in finding
solutions to the Ajax waterfront issues. A written response on this commitment is
requested from the Regions.
2.6 The Regions should add new "commitment" through this EA to not
piecemeal the EA studies for the next Plant expansion
The ESR states the Regions will consider the need for, and design of, a new
outfall as "an alternative" in undertaking the required EA to address wastewater
treatment exceeding the Plant's 630 MLD capacity. Flows are expected to
approach the 630 MLD capacity around the year 2031.
Staff supports the Regions comments, but there is a concern that this alternative
could too easily be discounted given the scope of the overall EA. Staff
recommends that Council request the Regions add a new item to the "Regions'
Commitments" confirming that the EA requirements to address future outfall
capacity limitations, including any modifications to the existing, and/or a new
outfall, will be completed as an integral part of the EA for increasing capacity
beyond 630 MLD. A written response on this commitment is requested from the
Regions.
3.0 EA Process
3.1 Part II Orders (or "bump up" requests) may be made to the Minister of the
Environment if a stakeholder is not satisfied with the Outfall EA
If a stakeholder's concerns regarding this project cannot be resolved in discussion
with the Regions, a stakeholder may request the Minister of the Environment to
make an order for the project to comply with Part II of the Environmental
Assessment Act. A Part II Order would require the type of EA to be elevated, in
this case, from a Schedule C Class EA to an Individual EA.
6
Report PLN 01-14 January 20, 2013
Subject: The Outfall EA Page 7
Following the Minister's review of submissions, and decision on any Part Il Order
requests, the Minister will issue a letter indicating whether the project can proceed,
and if so, whether there are conditions to proceeding with the undertaking. The
Regions will also need an Environmental Compliance Approval (previously
referred to as Certificates of Approval) before proceeding.
City staff does not recommend a Part II Order request be made to the Minister of
the Environment.
Attachments:
1. Illustration of Outfall
2. Executive Summary of the Environmental Study Report
3. Pickering Council Resolution #130/12
Prepared By: Approved/Endorsed By:
\i‘f(4.
Deepak Bhatt, MCIP, RPP Catherine Rose, MCIP, RPP
Planner II Chief Planner
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Thomas Melymuk, MCIP, RPP
Director, City Development
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Recommended for the consideration
of Pickering C ty Council
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Tony Prevedel, P.Eng.
Chief Administrative Officer
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Executive Summary
In December 2010,York Region and Durham Region(the Regions)jointly initiated this Sche dule C Municipal
Class Environmental Assessment(EA)study in order to comply with the Conditions imposed by the Minister
of Environment in his letter of March 2007 regarding the previous Duffin Creek Water Pollution Control
Plant Stage 3 Expansion Class Environmental Assessment(Expansion Class EA)and his decision to deny Part
II Order requests.The Conditions imposed by the Minister which relate to this Outfall Class EA are noted
below:
• Condition 7:The Regions shall initiate the environmental assessment activity required to address the
limitations in the existing outfall/diffuser within six(6)weeks of obtaining all necessary approvals for the
Stage 3 plant expansion.
• Condition 8:The Regions shall notify the Environmental Assessment and Approvals Branch and the
Regional Director,Central Region, Ministry of the Environment when the Notice of Commencement has
been issued,outlining the timelines associated with the completion of all technical studies necessary to
carry out the environmental assessment activity.
• Condition 13:The Regions shall submit an annual report to the Director, Environmental Assessment and
Approvals Branch,providing clear statements on expected completion dates for each stage of the
environmental assessment and indicate when and describing how the above conditions are being
fulfilled. •
Following a detailed assessment and extensive consultation,the preferred solution selected under this
Outfall Class EA is to modify the existing outfall with variable diffuser ports and optimize existing operations.
All 63 of the existing diffuser ports will be fitted with variable diffusers to improve effluent mixing.
Operation of the facilities will be adjusted as required to allow for enhanced phosphorus removal using iron
salts and polymer to continue to meet the MOE-approved 311 kg/day loading limit as flows increase to
630 MLD.The Regions'plan is to implement the preferred solution prior to flows reaching 520 MLD and
upon receiving all necessary approvals.When flows approach 630 MLD the Regions will examine the need to
complete the applicable environmental assessment process to identify a preferred strategy for meeting
future wastewater needs beyond 630 MLD.
The Class EA process and its results are documented in this Environmental Study Report(ESR).
•
ES.1 Background and Purpose
In 2012,the Duffin Creek Water Pollution Control Plant's(WPCP)treatment capacity was expanded from
420 million litres per day(MLD)to 630 MLD and upgraded to provide increased phosphorus and ammonia
removal through an amended Environmental Compliance Approval(ECA).Although the plant itself has a
capacity of 630 MLD,the Ontario Ministry of the Environment(MOE) limited the current plant outfall
capacity to 520 MLD due to mixing limitations with the receiving waters of Lake Ontario.
The project opportunity statement for this environmental assessment was developed as follows with input
from the Stakeholder Advisory Committee and public:
"To identify a preferred solution for addressing the capacity limitations of the existing outfall
at the Duffin Creek WPCP that continues to protect the environment and human health."
ES.2 Study Approach
When the process was initiated in 2010,the Regions chose to follow the process for Schedule C projects,as
described in the Municipal Engineers Association's Municipal Class Environmental Assessment document
(June 2000,as amended),given the wide range of alternatives and public interest.This is the highest level of
Class EA,and included the following four phases:
WBG11111321552TTOR ES-I
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EXECUTIVE SUMMARY
• Phase 1:Definition of the problem/opportunity
• Phase 2:Identification and assessment of alternative solutions for addressing the limitations of the
existing outfall at the Duffin Creek WPCP
• Phase 3:Identification and review alternative methods and develop the implementation strategy for the
preferred solution
• Phase 4:Preparation of this ESR
Figure ES-1 illustrates the detailed steps undertaken in this Class EA.
•
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ES-2 W5G1111 13 21 5 5 2 7TOR
COPYRIGHT 2013 BY CH2M HILL CANADAIIQED•ALL RIGHTS RESERVED
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EXECUTIVE SUMMARY
FIGURE Es-i
Outfall Class EA Approach Flow Diagram _
,4 P jett Apo •act J��
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umilicommatmosim, Define Opportunity Statement I
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Summarize Existing Conditions and
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EXECUTIVE SUMMARY
The preferred solution identified at the end of Phase 2,does not require physical construction works,and as
such is not categorized as a Schedule C project under the MEA's Class EA document.The Regions however
chose to continue to complete the Schedule C due to the high level of stakeholder interest and further to I l
provide stakeholders with many and varied opportunities for comment and input into the Class EA process
and final recommended solution.
ES.3 Extensive Consultation beyond Schedule C Class EA
Requirements'
Consultation with the public, regulatory agencies,and other stakeholders is a vital component of this Class
EA,and extensive consultation activities have been undertaken throughout each phase of work.This level of
consultation undertaken by the Regions goes well beyond the requirements of the Schedule C Class EA
process.The Regions have held five meetings with a stakeholder advisory committee (SAC),four information
centres(four in the Town of Ajax and four in the City of Pickering)and workshops with the public and other
stakeholders, presented to a local municipal council,conducted plant tours, and prepared numerous
newsletters and notifications.In addition,study reports, peer review comments,and public consultation
materials were placed on the project-specific website as they were completed.figure ES-2 summarizes the
consultation activities undertaken as part of this Class EA.
FIGURE ES-2
Public Consultation Activities Undertaken during the Outfall Class EA
•
Project
website
Presented
and metwith Continuous
To of A ax CommentTown j Response _ _
staff and tog
council
Exceeded
Conducted consultation interim
Plant requirements - reports
Tours fora available
Schedule C-- to public
Class EA
/17
SAC First Nations
Committee consultation
lndivrlual
meetwigs in
key -
st?ee11c1der
comnunttes
The Regions have received over 500 comments and questions through emails, phone calls,letters,public
information forums and other reports and documentation as part of the Outfall Class EA Study.These
comments and questions have been responded to directly and/or have been recorded in the project
comment response log provided in this ESR. The assessment process documented herein also reflects the
input provided.
ES-4 WBG11111321S527TOR
COPYRIGHT 2013 BY CH2M HILL CANADAlLj TED•ALL RIGHTS RESERVED
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EXECUTIVE SUMMARY
ES.4 Independent Peer Review as Additional Quality Control
A Schedule C Class EA does not require a peer review of technical documentation. However,the Regions
undertook this additional step to confirm key aspects of the technical information included in this Class EA.
The Regions were committed to developing a preferred solution for meeting the limitations of the existing
outfall that is technically sound and defendable,and therefore assembled an independent peer review team
of internationally renowned experts to provide opinions and comments on the technical documents
supporting the Duffin Creek WPCP Outfall Class EA,in particular:
• Existing Conditions and Baseline Reports
• Impact assessment of alternative solutions
• Methods of implementing the preferred solution
Overall,the peer review team provided valuable input and confirmation of technical aspects of the study at
key points in the decision process.
ES.5 Duffin Creek WPCP and Outfall
As indicated on Figure ES-3,the Duffin Creek WPCP is located on the north shore of Lake Ontario at the foot
of Squires Beach Road in the City of Pickering, in the Regional Municipality of Durham.The WPCP property is
bounded by the Pickering Nuclear Generating Station (PNGS)to the west,industrial properties to the north,
Duffins Creek to the east,and Lake Ontario to the south.The Duffin Creek WPCP is jointly owned and
operated by the Regions.
FIGURE ES-3
Duffin Creek WPCP—Location and Study Areas
•
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Clly of 1_1 ( • •" .� Area, 1akWater
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EXECUTIVE SUMMARY '-•+/ "� �_ ��
The Duffin Creek WPCP is designed to provide nitrification and enhanced phosphorus removal.It has one of
the strictest effluent requirements of all plants discharging into the open waters of Lake Ontario,and
continually betters these requirements.The Duffin Creek WPCP outfall is the pipe used to convey highly-
treated effluent into Lake Ontario.The outfall has a diameter of 3 m and is 1,100 m in length extending into
Lake Ontario.The outfall has 63 risers and diffuser ports located along the last 183 m of the length of the
outfall.The outfall configuration is illustrated in Figure ES-4.
•
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iii EXECUTIVE SUMMARY
i it": . :a 2 N 01. -151
The study areas used in the assessment of alternative solutions are illustrated on Figure ES-3.The Local
Study Area(LSA)includes the land,facilities,buildings and infrastructure at the Duffin Creek WPCP,and
extends approximately 4 km into Lake Ontario.The LSA includes an area where there is a reasonable
potential for direct effects on the environment from alternative solutions,either through construction or
operations of the alternative solution.The RSA extends from Frenchman's Bay to the Ajax Water Supply
Plant intake,and includes the terrestrial,nearshore,and offshore areas of the natural environment.The
Regional Study Area(RSA) includes the area within which there is the potential for cumulative biophysical
and socio-economic effects;this includes beach areas,communities and portions of Lake Ontario around the
Duffin Creek WPCP site and Local Study Area that are considered relevant to the assessment of any direct
and indirect effects of the alternative solutions.
ES.6 Alternative Solutions
ES.6.1 Short-listing of Alternative Solutions
The project team,with input from stakeholders,identified a long-list of alternative solutions for addressing
the limitations of the existing outfall.These alternative solutions were reviewed through a screening process
as to their ability to meet the study purpose,and a short-list of alternatives was developed for detailed
evaluation.Based on the screening process the following alternative solutions were carried forward for
detailed assessment:
1. Existing Upgraded Plant and Optimized Operations(Stages 1,2,3)
2. Modify Existing Outfall Diffuser
3. Provide Tertiary Treatment at the Duffin Creek WPCP
4. Extend Existing Outfall Diffuser
5. New Outfall
Alternatives 2 through 5 included Alternative 1,and were considered combination alternatives since the
existing upgraded plant and optimized operations are required for all alternatives to meet the MOE water
quality regulations.
Along with the short-list of alternatives,three partial solutions were identified including:water efficiency
programs and wastewater reduction measures;divert increased flows to a new WPCP,and storage and
system management.The partial solutions alone will not solve the problem statement, but water efficiency
programs,wastewater reduction measures and storage and system management are being implemented by
the Regions as part of their overall wastewater management program,and as such are not carried forward
in this Class EA for further assessment.Currently,diverting increased flows to a new WPCP is being assessed
in a separate!EA but even if implemented,it will not solve the problem statement.
ES.6.2 Detailed Evaluation of Short-listed Alternative Solutions
To evaluate the short-list of alternatives,detailed evaluation criteria reflecting the components of the
environment as indicated in the EA Act were identified in consultation with the SAC and public.The SAC
were also given the opportunity to weight the importance of the criteria.Criteria including performance,
impacts to water quality,aesthetic conditions along the shoreline,and the Ajax Water Supply Plant(WSP)
Intake were considered among the most important in the assessment of alternatives,whereas financial
considerations were considered of lesser importance.Although not all SAC members participated in the
process,feedback through the process suggested that consistent with the weighting by the participating SAC
members,many other public stakeholders felt outfall performance,impacts to water quality,aesthetic
conditions along the shoreline,and the Ajax WSP Intake were of most importance,and financial
considerations of less importance.
Using the criteria and their weights,the project team considered the pathways of effect to assess impacts
(after mitigation)of alternative solutions.Alternative solutions were ranked based on the detailed
assessment from highest to lowest,with higher scores reflecting a more favourable alternative solution.
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Figure ES-5 presents the results of this detailed evaluation.
FIGURE ES-5
Overall Score for Each Alternative Solution
,.
' I
4.5 - -
4.Q - .
3.5 - .
3.0 -
2.5 - -
4.4 4.3 3.6
2.0
1.5
1.0 - _
0.5 -
Modify Existing Optimized New Outfall Tertiary Extend Existing
• Outfall Operations Treatment Outfall
Alternative 2-Modify Existing Outfall Diffuser(including optimized operations)was ranked first because of
_ its use of existing infrastructure,relative ease of implementation,low impacts on natural and social
features,and its relatively low capital,operating and lifecycle costs.Furthermore,it meets MOE water .
quality regulations until flows reach at least 630 MLD.This alternative would be implemented prior to flows
reaching 520 MLD as per the current ECA requirements and upon receiving required approvals.As'indicated,
Alternative 1-Existing Upgraded Plant and Optimized Operations(Stages 1,2,and 3),is ranked second
because of its overall low impacts and costs. However, it alone will not meet the MOE initial dilution
guideline of 20:1 at flows up to 630 MLD.
Alternative 5, new outfall(including optimized operations),which ranked third,is the only alternative that
would have the potential for meeting possible long-term flow requirements and would also be necessary
when the existing outfall reaches the end of its useful life.The Regions screened this alternative forward to
the short list of alternatives and initially considered moving forward with this alternative as part of the
overall preferred strategy.However,given the fact that it is not required for well into the future,the Regions
consulted with the MOE as to possible approaches under Ontario's EA process for considering the new
outfall.The Regions concluded that the new outfall alternative would not be part of this Class EA,because of
factors such as modelling approaches,technologies,construction methods and approval requirements will
likely change or be more advanced by the time a new outfall is required. However,it will remain an option
forconsideration when the Regions examine the need to'complete the applicable environmental
assessment process to identify a preferred strategy for meeting future wastewater needs beyond 630 MLD.
ES.7 Implementation Strategy
The preferred solution for addressing limitations to the existing outfall involves replacing the existing fixed
ports with variable diffuser ports,as illustrated on Figure ES-6.This allows for more favourable dilution
conditions by allowing the port opening sizes to increase/decrease depending on flows,allowing for the
most efficient exit velocities and mixing characteristics.Modifying the existing outfall diffuser with variable
diffuser ports will be implemented when all approvals are received and when lake conditions permit divers
•
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to perform the work.The preferred method is to install all ports at the same time, rather than over time.
Divers will replace the existing ports and install the variable diffuser ports simultaneously over a 2 to 4 week
period.No construction is required.There are no additional operating costs as the outfall diffusers will
continue to be inspected on an annual basis.The estimated capital cost of this solution is approximately
$1.1 million.
FIGURE ES-6
Comparison of Fixed Diffuser Port and Variable Diffuser Port Openings •
Fixed Diffuser Port Variable Diffuser Port
I _
Reducer
Nozzle
Check
Valve
Lakebed Lakebed
The strategy for optimizing operations at the Duffin Creek WPCP for meeting the total phosphorus loading
limit of 311 kg/day from present flows to the rated capacity of 630 MLD is currently in place.This strategy
involves using Dual Point Addition(DPA)to improve phosphorus removal by precipitating phosphorus in two
parts of the treatment process rather than one as in the case of Single Point Addition (SPA).To reduce
performance risks particularly as flows approach 630 MID,the possible use of alternative chemicals and
'polymer added to the secondary treatment process are part of the overall implementation strategy.Systems
at the Duffin Creek WPCP are designed with the flexibility to use alternative iron salts such as Ferrous or
Ferric Chloride depending on process requirements. Furthermore,phosphorus removal in secondary
treatment can be enhanced or further controlled with the addition of polymer prior to secondary clarifiers
which improves phosphorus particulate capture.
The preferred solution for this Class EA will increase the capacity of the existing outfall from 520 MLD to the
rated capacity of the plant,630 MLD.Average day flows of 630 MLD are expected to be reached at the
earliest by 2031.When flows approach 630 MLD,the Regions will be required to undertake another Class EA
to identify a preferred strategy for meeting future wastewater servicing needs.The need for and any design
requirements for a new outfall will be one of the alternatives reviewed when the Regions complete the
applicable environmental assessment process to identify a preferred strategy for meeting future wastewater
needs beyond 630 MLD.
ES.8 Protecting the Environment
Table ES-1 provides a summary of net effects of the preferred solution;i.e.the effects after the above
mitigation and monitoring measures are implemented.The preferred solution will meet all performance
objectives,with no or negligible effects on the natural,social,cultural and heritage environment compared
to the baseline and can be implemented safely,efficiently and with relatively low costs.
The mitigation measures aim to maintain performance and to reduce risks for work health and safety.The
.key mitigation measures are to:
• As flowsincrease,refine alternative chemicals and polymer through both bench scale and full scale
assessments
• Continue to monitor the hydraulic performance and condition of the outfall.
•
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• Continue to monitor the performance of the regional programs to manage peak flows.
• Contractor to prepare and implement diver safety plan for installation and inspection of the variable
diffuser ports,in accordance with the Occupational Health and Safety Act(OHSA). •
• Follow standard operating procedures(SOPS)for equipment use and chemical handling.
TABLE ES-1
Summary of Net Effects
Category Net Effects
Technical Performance:Provides total phosphorus loading of less than 311 kg/day;provides more favourable
• initial dilution;meets all provincial and federal regulations and therefore no net effects are anticipated.
Natural Aquatic and Terrestrial Habitat:No construction is required;operation results in negligible change in
the size of the unionized ammonia mixing zone compared to baseline;no important fish habitat was
recorded In the mixing zone.Mixing zone is used by fish on a transient basis only.Therefore no net
effects are anticipated.
Social/Cultural Aesthetic Conditions Along the Shoreline:Phosphorus mixing zone is smaller than baseline and does
not interfere with the shoreline.
Ajax Water Intake:Ammonia concentrations at the intake are far below the source water protection
objective of 0.5 mg/L and increase negligibly from the baseline condition.
Culture,Tourism and Recreation:No construction is necessary;therefore,no impacts to public access •
to the lake and Waterfront Trail;and no impacts to archaeological or cultural features from
construction.Operation will not affect recreational uses;E.coli levels from the Duffin Creek WPCP
effluent are well below the PWQO of 100 E.coli per 100 mL sample.
Health and Safety:There will be no risks to community health and safetl/due to noise/vibration,and
low risk for divers during the installation of variable diffuser ports.
Therefore,for Social/Cultural,no or negligible net effects are anticipated.
Financial Capital Costs:$1.1M-$1.5M •
Yearly Operating Costs:<$1M
The net effects are manageable by the Regions'capital budget.
ES.9 Regions' Commitments
Throughout this Schedule C Class EA,the Regions have made various commitments with respect to the
project undertaking.These commitments are described throughout this ESR.The following is confirmation
that the Regions commit to:
• Implementing the recommended solution, Modify the Existing Diffuser to meet greater than 20:1 initial
dilution as follows:
•
— Replace the existing fixed diffuser ports with variable diffuser ports(variable opening check valves)
— Replace all 63 diffuser ports upon receiving an amended ECA from the MOE
- Purchase extended warranty if available for variable opening check valves
• Continue to optimize the existing upgraded plant in accordance with the Regions'ongoing
implementation strategy,which is to:
- Enhance phosphorus removal with iron salts and polymer addition to meet loading limit of 311 kg/d
at 630 MLD
• Ongoing voluntarily participation in and/or support of regional and provincial water quality
investigations and research
• Refine alternative chemicals and polymer through both bench scale and full scale assessments as flows
increase
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• Continue to monitor the hydraulic performance and condition of the outfall
• Continue to monitor the performance of existing programs to manage peak flows
. I
• Meeting and striving to exceed the proposed effluent compliance criteria •
• Undertake diver inspections of diffuser installation annually •
• Remove and inspect a single diffuser port check valve after 5 years
• Develop a Duffin Creek WPCP website to better communicate information regarding the operations,
maintenance and performance of the plant
ES.10 Future Opportunities for Public Involvement
Typically,a minimum 30-day public-review period is given for the review of the ESR and associated studies in
• a Schedule C Class EA process,during which time Part II Order Requests can be made to the Minister of the
Environment.For this Class EA,a 90-day public review period was granted upon request by Town of Ajax
councilors and senior staff to allow stakeholders time to review the extensive information presented in this
ESR.Therefore,the ESR,including supporting studies,is available for viewing from Tuesday,
November 191 2013 to Monday February 17,2014 at:
Durham Region Headquarters The Regional Municipality of York
Clerk's Department Clerk's Department
605 Rossland Road East 17250 Yonge Street •
Whitby,ON L1N 6A3 Newmarket,ON L3Y 6Z1
Ajax Town Hall Pickering City Hall
65 Harwood Avenue South 1 The Esplanade South
Ajax,ON L1S 2H9 Pickering,ON L1V 6K5
Ajax Public Library(Main Branch) Pickering Public Library(Central Branch)
55 Harwood Avenue South 1 The Esplanade South
Ajax, ON L1S 2H8 Pickering,ON L1V 6K5
The Environmental Study Report and supporting studies will also be available on the project website
www.durham.ca/outfallEA.
If concerns arise regarding this project which cannot be resolved in discussions with the Regions,a
person/party may request that the Minister of the Environment make an order for the project to comply
with Part II of the Environmental Assessment Act.A Part II Order can elevate the level of assessment for a
project. Requests for a Part II Order must be received by the Ministry by Monday February 17,2014 and can
be submitted by a written request to the Minister at the following address:
The Honourable Jim Bradley
Minister of the Environment
12th Floor,135 St.Clair Avenue West
Toronto,Ontario M4V 1P5
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EXECUTIVE SUMMARY
Copies of Part II Order requests should also be sent to:
Mr. Barry Laverick,P.Eng. Mr.Wayne Green,P.Eng.
Project Manager Project Manager
Regional Municipality of Durham The Regional Municipality of York
605 Rossland Road East,Box 623 17250 Yonge Street
Whitby,ON L1N 6A3 Newmarket,ON L3Y 6Z1
Phone:905 668-7711,ext.3840 Phone:905 830-4444,ext.5144
Toll Free: 1-800-372-1102 Toll Free: 1-877-464-9675
Fax:905 668-2051 Fax:905 836-4590
•
• , I
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Cifq O • . Council Meeting Minutes
Monday, October 15, 2012
NCOR .41-0[ 7:00 PM
Council Chambers
(IX) Motions and Notice of Motions
Duffin Creek Water Pollution Control Plant,
Resolution# 130/12
Moved by Councillor O'Connell
Seconded by Councillor McLean
WHEREAS The current outfall of the Duffih Creek Water Pollution Control Plant(WPCP)
extends from the onshore for a distance of approximately 1 kilometre offshore under the bed
of Lake Ontario;AND
WHEREAS Current Ministry of the Environment(MOE)approvals allow effluent flows to be
released up to a limit of 520 MLD, and Durham and York Regions (the Regions) may be
allowed to increase to 540 MLD if MOE's Central Region Director is satisfied that effluent
limits set out in the Certificate of Approval (CofA)for sewage works, including Total
Phosphorus loading limits, can still be met;AND
WHEREAS approval for the Regions to operate the WPCP above 540 MLD cannot be
granted by MOE until the Regions have implemented a Preferred Alternative to address the
Outfall-Diffuser limitations associated with the recent Stage 3 Expansion to the WPCP;AND
WHEREAS Through the Outfall EA process, the Regions are requesting to be allowed to
release 630 MLD;AND
WHEREAS In Spring 2012, a more detailed study that builds on the University of Waterloo
study and Dr. Auer's review was initiated by MOE Great Lakes researchers. MOE's
- fieldwork is expected to be completed in 2013, followed by analyses and a final report;AND
WHEREAS Dr. Todd Howell of the MOE Great Lakes research section is currently
conducting an in-depth study of the Ajax-Pickering nearshore that is expected to be
completed and reported on in 2014;AND
WHEREAS The MOE study presently underway is anticipated to fill information gaps and
help inform the best practical management decisions about the WPCP and its Outfall-
Diffuser, as well as other sources that'could result in improved shoreline conditions and
nearshore water quality for swimming and other uses.
NOW THEREFORE BE IT RESOLVED The Council for the Corporation of the City of
Pickering request the Regions of Durham and York to adjust the Project Timeline for the
Outfall EA to integrate the Ministry of the Environment's 2012-2013 study of Lake Ontario
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Monday, October 15, 2012
_Or�� _�?��� - • - • 7:00 PM •
• Council Chambers •.
•
water quality along the Ajax-Pickering shoreline, in order to better understand the -
accumulating adverse environmental impacts of past and present effluent emissions from -
the Duffin Creek WPCP's existing Outfall-Diffuser, by more precisely determining the
relative loads and concentrations from sources that contribute to the growth of nuisance
Cladophora algae that fouls beaches and shorelines and clogs the intakes at the Pickering •
Nuclear Generating Station and Lake Ontario-based water supply plants. V
AND THAT copy of this resolution be sent to the Ministry of the Environment and MPP Joe
Dickson and MPP Tracy MacCharles. •
• • Carried on a Recorded .
Vote as follows.
•Yes No
Councillor O'Connell - . • Councillor Pickles •
Councillor Rodrigues •. Mayor Ryan
Councillor Ashe • • . .•
Councillor McLean _
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