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Drainage Improvements Tributary 8A and Frost Overflow Channel Municipal Class Environmental Assessment
Prepared for:City of Greater Sudbury P.O. Box 5000, Station “A” 200 Brady Street, Tom Davies Square Sudbury, Ontario P3A 5P3
Prepared by: Earth Tech (Canada) Inc.1040 Lorne Street South, Unit #1 Sudbury, Ontario P3C 4R9
March 19, 2008
Project No. 104012
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Prepared for: City of Greater Sudbury P.O. Box 5000, Station “A” 200 Brady Street, Tom Davies Square Sudbury, Ontario P3A 5P3
Prepared by: Earth Tech (Canada) Inc. 1040 Lorne Street South, Unit #1 Sudbury, Ontario P3C 4R9
Proj ct No. 104012 e
March 19, 2008
City of Greater Sudbury Tributary 8A Drainage Improvements
Municipal Class Environmental Assessment
TABLE OF CONTENTS
1.0 INTRODUCTION AND BACKGROUND ..................................................................................................1
1.1. INTRODUCTION .............................................................................................................................................1 1.2. BACKGROUND...............................................................................................................................................1 1.3. OBJECTIVE ....................................................................................................................................................3
2.0 THE CLASS ENVIRONMENTAL ASSESSMENT PROCESS................................................................4
3.0 PHASE 1: PROBLEM IDENTIFICATION .............................................................................................10
3.1. PROBLEM STATEMENT................................................................................................................................10 3.2. STUDY AREA ..............................................................................................................................................11
4.0 PHASE 2: ALTERNATIVE SOLUTIONS TO THE PROBLEM..........................................................13
4.1. IDENTIFICATION AND DESCRIPTION OF THE ALTERNATIVE SOLUTIONS ......................................................13 4.1.1. Do Nothing (Alternative A) ...............................................................................................................13 4.1.2. Limit Growth (Alternative B).............................................................................................................13 4.1.3. Maximize Tributary 8A but allow Flooding beyond Capacity (Alternative C)..................................13 4.1.4. Construct a Flood Diversion Structure and Overflow Channel (Alternative D) ...............................14
4.2. DESCRIPTION OF THE EVALUATION METHODOLOGY ..................................................................................14 4.2.1. Application of the Evaluation Methodology ......................................................................................16
4.3. SUMMARY OF EVALUATION OF ALTERNATIVES..........................................................................................18 4.4. EVALUATION OF OVERFLOW CHANNEL LOCATIONS AND DIVERSION STRUCTURE.....................................20
5.0 SUMMARY OF PREFERRED ALTERNATIVE.....................................................................................24
5.1. UPGRADE OF INLET SPUR TO TRIBUTARY 10 (HANMER DRAIN) .................................................................25
6.0 RECOMMENDED MITIGATIVE MEASURES......................................................................................27
6.1. CONSTRUCTION RELATED IMPACTS............................................................................................................27 6.2. SEDIMENT CONTROL - EROSION..................................................................................................................28 6.3. STANDARD MITIGATION MEASURES...........................................................................................................29
7.0 SUMMARY OF CONSULTATION PROGRAM .....................................................................................30
7.1. NOTIFICATION OF COMPLETION..................................................................................................................31
8.0 RECOMMENDATIONS .............................................................................................................................33
Project No. 104012 Page I
City of Greater Sudbury Tributary 8A Drainage Improvements
Municipal Class Environmental Assessment
APPENDICES
Appendix A EA Process
Appendix B Public Consultation Information
Appendix C Flow Calculations
FIGURES
Figure 1: Drainage Work Completed Since 1987......................................................................................... 2
Figure 2: Overview of the Class Environmental Assessment Process.......................................................... 6
Figure 3: Study Area................................................................................................................................... 11
Figure 4: Alternative A/B - Do Nothing / Limit Growth ............................................................................ 19
Figure 5: Alternative C - Maximize Tributary 8A but Allow Flooding Beyond Capacity ......................... 19
Figure 6: Alternative D (a) - Flood Diversion and Overflow Channel, along Frost Avenue...................... 21
Figure 7: Alternative D (b) - Flood Diversion and Overflow Channel, Divert Flows Easterly.................. 21
Figure 8: Alternative D - Flood Diversion Structure .................................................................................. 22
Figure 9: Typical Drainage Cross Section .................................................................................................. 22
Figure 10: Alternative D - Flood Diversion Structure and Diversion Channel .......................................... 23
Figure 11: Upgrade of Tributary 10 Inlet Spur ........................................................................................... 25
Figure 12: Preferred Drainage Improvement to Tributary 8A.................................................................... 26
TABLES
Table 1: Evaluation of Alternative Drainage Improvement Solutions........................................................ 17
Table 2: Typical Mitigation Measures ........................................................................................................ 27
Project No. 104012 Page II
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
1.0 INTRODUCTION AND BACKGROUND
1.1. Introduction The City of Greater Sudbury has completed a Class Environmental Assessment (Class EA) study to
investigate options and determine the most viable long-term related alternative for the drainage
improvements of Tributary 8A.
Tributary 8A is located in Hanmer, in the City of Greater Sudbury. Hanmer is part of a larger area known
better as Valley East. The area surrounding the proposed improvement is predominantly residential in
nature with some agricultural and commercial type uses. The proposed improvement, located to the east
of Frost Street in Hanmer, is part of a natural drainage course that occasionally overflows onto
neighbouring properties.
The requirement to improve the drainage of the natural water course and Tributary 8A was initiated by
concerned residents placing calls to Municipal Staff about standing water along the roadside ditches and
the natural drainage path.
The improvements to the drainage network are required to ensure that the water is safely drained away
from the existing residential neighbourhood located adjacent to the tributary. The proposed works are to
include:
• The improvements to Tributary 8A along the existing drainage course for the portion of Elmview
Drive to the rear properties located on the east side of Frost Street near the intersection of Gerard
Court and Marlene Avenue; and
• The construction of an Overflow Channel on a strip of land purchased by the City of Greater
Sudbury, and abutting the rear of properties located on the east side of Frost Street from Dominion
Drive to Tributary 8A.
1.2. Background Most portions of the tributary and its spurs have been altered, improved and/or maintained over the years
by the former Town of Valley East, now part of the City of Greater Sudbury (City), as shown in Figure 1.
At that time, Tributary 8A was classified by the municipality as a natural drainage course.
This project, the improvements to Tributary 8A, was first initiated in late November 2003 by the City’s
Roads and Drainage Engineer. The evaluation of this project was started in response to complaint by
Project No. 104012 Page 1
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
local residents to the Ward Councilor in regard to the ponding of water in ditches that were either crossing
or abutting residential properties.
The scope of the project at that time was to perform an analysis of the tributary, and based on the results
of that assessment to perform improvements to the tributary from its upper end at Highway 69 North
(Municipal Road 80) to the Whitson River, a distance of approximately 6 kilometers.
The current proposal for the improvements involves only a portion of the entire tributary between the new
Municipal Road 80 drainage outlet and Elmview Drive. This section consists of approximately 1700 m of
the existing drainage course. Within this drainage section, there is approximately 110 m of uncovered
drainage that crosses private land, while approximately 70 m is located in a covered easement. The
remainder of the 1700 m tributary meanders either under public roadways or over lands owned by the
City.
Figure 1: Drainage Work Completed Since 1987
Project No. 104012 Page 2
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
Tributary 8A crosses privately and City owned land. Prior to these properties being purchased by the
Conservation Authority, historically, these parcels served as either a conveyance of storm water or as
storage within the flood plain. Development of these lands took place without any consideration for the
natural drainage of the area. As a result, a bottle neck at the rear of properties, north of Jeanne d’Arc and
west of Park was created because of the 15 foot easement. It is believed that the ponding of water and the
occurrence of flooding on neighbouring properties is a result of developing so close to the tributary.
In an effort to limit the further encroachment of residential development along the tributary, the NDCA
purchased individual residential lots from developers, (lots fronting on the east side of Park, the west side
of Frost and on the north and south side of Jeanne d’Arc). The City then obtained the land by land
transfer from the Nickel District Conservation Authority (NDCA) or from the former Municipality of
Valley East, through amalgamation.
The land acquired by the City from the former Town of Valley East was termed as being for future town
site development. Over the following years, those lands were severed for recreational use, and later for an
institutional use, now known as the City of Greater Sudbury Citizens Service Center and Library and non-
profit day care. All development occurred at the southerly end of the nearly 1000 m long property.
Other than these developments and a Canada Post kiosk at the north end, the property is vacant.
The section of Tributary 8A, subject to this Municipal Class Environmental Assessment, is located within
the 100-year event flood plain as defined by the NDCA in its drainage study entitled Whitson River
Hydrologic Analysis prepared by S.A. Kirchhefer Limited, dated June 1988.
The reliability of Tributary 8A to adequately convey storm flows requires expensive repairs to existing
culverts and drainage system. However, the City recognized there might be alternatives to the existing
drainage system of Tributary 8A that could address the City’s and community’s concerns.
1.3. Objective The objective of the drainage improvement to Tributary 8A is to lower the regulatory flood elevation by
increasing the discharge capacity of the drainage system. The intended result is to effectively reduce the
risks of potential flooding on neighbouring properties.
Project No. 104012 Page 3
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
2.0 THE CLASS ENVIRONMENTAL ASSESSMENT PROCESS All Municipalities in Ontario, including the City of Greater Sudbury, are subject to the provisions of the
Environmental Assessment Act (EAA) and its requirements to prepare an Environmental Assessment for
most public works projects. The Ontario Municipal Engineers Association (MEA) “Municipal Class
Environmental Assessment” document (October 2000, as amended in 2007), provides municipalities with
a five-phase planning procedure approved under the EAA to plan and undertake all municipal water,
sewage, stormwater management and transportation projects that recur frequently, are usually limited in
scale and have a predictable range of environmental impacts.
The Municipal Class EA document also serves as a public statement of the decision making process
followed by cities in the planning and implementation of needed infrastructure.
Figure 2 illustrates the process followed in the planning and design of projects covered by a Class EA,
including the City of Greater Sudbury's project. This figure incorporates steps considered essential for
compliance with the requirements of the EAA that are summarized below.
Phase 1 Identify the problem (deficiency) or opportunity.
Phase 2 Identify alternative solutions to address the problem or opportunity by taking into
consideration the existing environment and establish the preferred solution accounting for
public and agency review and input.
Phase 3 Examine alternative methods of implementing the preferred solution based upon the
existing environment, public and agency input, anticipated environmental effects and
methods of minimizing negative effects and maximizing positive effects.
Phase 4 Document, in an Environmental Study Report, a summary of the rationale and the
planning, design and consultation process followed in the project and make such
documentation available for scrutiny by review agencies and the public.
Phase 5 Complete contract drawings and documents; proceed to construction and operation and
monitor construction for adherence to environmental provisions and commitments.
Where special conditions dictate, also monitor the operation of the completed facilities.
Project No. 104012 Page 4
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
Based on the MEA Municipal Class EA (2000) document, projects are classified as either Schedule “A”,
“B” or “C” projects. Each of these classifications requires a different level of review to complete the
requirements of the Class EA, and thus comply with the EAA, as noted below:
Project No. 104012 Page 5
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
Figure 2: Overview of the Class Environmental Assessment Process
PHASE 1Identify & Describe the Problem
or Opportunity
PHASE 1Identify & Describe the Problem
or Opportunity
Schedule ‘B’
Project
Mandatory Review Agency/Public Consultation
Mandatory Review Agency/Public
Notification
PHASE 5Complete Drawings & Documents - Proceed to Construct, Operate &
Monitor Project
PHASE 5Complete Drawings & Documents - Proceed to Construct, Operate &
Monitor Project
Mandatory Review Agency/PublicConsultation
Mandatory Review Agency/Public
Notification
Discretionary Review Agency/PublicConsultation
Schedule ‘C’
Project
Public Information CentreAugust 2005
Schedule ‘A’, ‘B’ & ‘C’ Projects
PHASE 2Evaluate Alternative Solutions
& Establish the Preferred Solution
PHASE 2Evaluate Alternative Solutions
& Establish the Preferred Solution
PHASE 3Identify Alternative Design,
Environmental Effects & Preferred Design
PHASE 3Identify Alternative Design,
Environmental Effects & Preferred Design
PHASE 4Prepare Environmental Study Report (ESR) Documenting
Phases 1-3
PHASE 4Prepare Environmental Study Report (ESR) Documenting
Phases 1-3
File Env ironmentalStudy Report
Opportunity for Part llOrder Request
(formerly referred to as ‘Bump-up’)
Schedule ‘A’Project
Project File
Prepa red fo r:City of Grea te r Su dbu ryPO Bo x 5 00 0, STN´A´, 2 00 Brad y S t. Sud bu ry, O N Ca nad a P3 A 5P3
City of Greater SudburyTributary 8A
Drainage Improvement and Overflow Channel
Municipal Class Environmental Assessment
Dece mbe r 2 00 7
Indicates Where Project Currently is at in Class EA Process
Discretionary Review Agency/Public Consultation
Notice of Project InitiationApril 2005
Project No. 104012 Page 6
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
Schedule “A” Projects are limited in scale, have minimal adverse effects and include the majority of
municipal water operations, sewage, stormwater management, and maintenance
activities. These projects are approved and may be implemented without following the
Class EA planning process.
Schedule “A” projects typically include normal or emergency operation maintenance
activities where the environmental effects of these activities are usually minimal. As
such, these projects are pre-approved.
Schedule “B” Projects have the potential for some adverse environmental effects. The proponent (i.e.
the City) is required to undertake a screening process involving mandatory contact with
directly affected public and relevant review agencies to ensure that they are aware of the
project and that their concerns are addressed. Schedule “B” projects require that Phases 1
and 2 of the Municipal Class EA planning process be followed. A Project File Report or
Environmental Screening Document (ESD) must be maintained and available for review
by the public. If there are no outstanding concerns raised by the public and/or review
agencies, then the proponent may proceed to project implementation. If however, the
screening process raises a concern that cannot be resolved, then the Part II Order1
procedure (formerly referred to as a “bump-up”) may be invoked. Alternatively, the
proponent may voluntarily elect to plan the project as a Schedule “C” undertaking.
Schedule “B” projects generally include improvements and expansion to existing
facilities where there is potential for some adverse environmental impacts. Examples of
Schedule “B” projects include the establishment of new water supply pumping stations
and reservoir and watermain extensions where such facilities are located outside of an
existing municipal road allowance or utility corridor, or involves water crossings. As a
result, the proponent is required to proceed through a screening process (Phases 1 and 2)
including consultation with those who may be affected.
1 Part II Order refers to a request to the Minister of the Environment for a project to comply with Part II (addresses individual Environmental Assessments) of the Environmental Assessment Act. The requirement to prepare an individual Environmental Assessment (EA) involves the preparation of a Terms of Reference and EA document that is submitted to the Ministry of the Environment (MOE), other government agencies and the public for review. This can be considered a large study undertaking that has historically been applied to large-scale significant infrastructure projects such as major highway proposals.
Project No. 104012 Page 7
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
Schedule “C” Projects that have the potential for significant environmental effects must proceed under
the full planning and documentation procedures (Phases 1 to 4) specified in the MEA
Municipal Class EA document. Schedule “C” projects require that an Environmental
Study Report (ESR) be prepared and submitted for review by the public. If concerns are
raise that cannot be resolved, then the Part II Order procedure may be invoked.
Schedule “C” projects typically include the siting-construction of new facilities and
major expansions to existing facilities, such as water or wastewater treatment plants.
City of Greater Sudbury’s Drainage Improvements Class EA Planning Schedule
As this project involves the modification, retrofit, or improvement to a retention/detention facility
including the outfall or infiltration of a system for the purpose of stormwater quality (Schedule “B”
Activity), Phases 1 and 2 of the Municipal Class EA planning process as described above apply to this
study.
Phase 1 Identify the problem (deficiency) or opportunity.
Phase 2 Identify alternative solutions to address the problem or opportunity by taking into
consideration the existing environment and establish the preferred solution accounting for
public and agency review and input.
At the conclusion of Phase 2 a project file will be prepared to summarize the rationale
and the planning, design and consultation process followed in the project. The
documentation of the project will be made available for scrutiny by review agencies and
the public. If no objections to the project are received, the project can be implemented as
documented in the project file.
Under Part C, Municipal Water and Wastewater Projects of the Municipal Class EA, section C.1.3 is
dedicated to Stormwater Management Projects. According to the description of the various stormwater
management projects, the City’s proposed project can be categorized as involving the upgrading to an
existing stormwater management system. These upgrades can consist of modifications to existing
facilities which are intended to modify flows, volumes and/or quality control. Also, these projects can be
undertaken for the management of watercourses, in this case Tributary 8A; where the management is
intended to minimize the impacts of flooding on surrounding land uses.
Project No. 104012 Page 8
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
Where this project is concerned, the expansion or upgrading of a stormwater management project can
involve the construction of stormwater channel improvements and/or the addition of control measures
such as weirs, to control stormwater flows.
Also taken into consideration during the preparation of this Class EA were the receiving water courses,
which include overland flows through local tributaries, ditches, channels, intermittent or continuous
streams and creeks.
The proposed project was undertaken to resolve issues of flooding on the neighbouring properties in the
area of Tributary 8A, including those areas proposed for future development. The result of this project is,
therefore, intended to potentially satisfy the following objectives:
• Alleviate local flooding problems.
• Eliminate or reduce the risk of public health or safety problems/nuisances
• Expand the capacity of the stormwater system
• Improve the system
The following sections discuss the evaluation process followed to satisfy the identified problems and the
improvements to Tributary 8A.
Project No. 104012 Page 9
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
3.0 PHASE 1: PROBLEM IDENTIFICATION Phase 1 of this two-phase Class EA planning process requires the proponent (i.e. the City of Greater
Sudbury) of an undertaking to document factors leading to the conclusion that the improvement is needed,
and ultimately, develop a clear statement of the identified problem to be investigated.
As such, the Problem Statement is the principle starting point in the undertaking of a Class EA and
becomes the central theme and integrating element of the project. It also assists in setting the scope of the
project.
3.1. Problem Statement The problem statement for the City of Greater Sudbury’s Tributary 8A Drainage Improvement project is
defined as follows:
The existing Tributary 8A drainage area presents an unacceptable health and flood risk to the
residents living within the study area. City staff have received many complaints from residents
regarding the ponding of water within the study area; this is due to the flat grades, between 0.1 and
0.2%, and uneven inverts. As well, there is an increased risk of flooding as a result of the conditions
of the existing drainage culverts.
The infilling of a tributary flowing entirely within a flood plain is unacceptable, while ditching to
depths approaching the water table is impractical.
As a result, in recent years, more residential construction has required that owners certify their
homes as being flood proof by building at an elevation specified by the Nickel District Conservation
Authority (NDCA).
Therefore, to reduce the requirement of the property owners/builders of having to make modifications
to their premises to be certified, the City decided to undertake drainage Class EA to improve the flow
through the area.
The objective of the study is to:
1. Improve the drainage of Tributary 8A along the existing drainage course;
2. Construct an overflow channel; and
3. Relocate and improve the drainage of an inlet spur of Tributary 10 (Hanmer Drain).
Project No. 104012 Page 10
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
In order to address the above, the City of Greater Sudbury initiated this Class EA planning process which
identifies and evaluates alternative drainage improvement solutions and accordingly addresses the above
problem statement. This Class EA Project File has been prepared to determine how the City can improve
the existing drainage within the subject area.
3.2. Study Area The following section describes the project location, land uses and natural environment features. Figure 3
shows the general area subject to this Class EA study.
Figure 3: Study Area
Project No. 104012 Page 11
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
Location
The project study area is generally located in the community known as Hanmer (Valley East), north of the
former City of Sudbury. The area subject to the improvement is located between Municipal Road 80 (MR
80) and Dominion Drive, and east of Frost Avenue. The project is located on vacant land purchased by
the City for the proposed improvements.
Land Use
Existing land uses within the study area are predominantly mixed in nature. Land uses include
residential, commercial, recreational, institutional, agricultural and rural.
Natural Environment
The natural environmental features within the project study area comprise of a drainage network
Tributary 8A, Tributary 10 (Hanmer Drain) and their inlet spurs. These areas are predominately grass
lined. The property purchased by the City of Greater Sudbury for the location of the overflow channel,
near Dominion Drive, is partially forested land.
The general flow direction of water within the study area is towards the Whitson River, located to the
south of Dominion Drive.
There are no Environmentally Sensitive Areas (ESAs), provincially significant wetlands (PSWs) or Areas
of Natural and Scientific Interest (ANSIs) with the project study area. There are also no documented
vulnerable, threatened and endangered (VTE) species within the study area. Finally, there are no known
archeological sites within the project study area.
Project No. 104012 Page 12
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
4.0 PHASE 2: ALTERNATIVE SOLUTIONS TO THE PROBLEM
4.1. Identification and Description of the Alternative Solutions The Municipal Class EA process recognizes that there are many ways of solving a particular problem and
requires that various alternatives be considered. The City of Greater Sudbury identified and evaluated the
following alternative solutions for consideration in this Class EA:
A. Do Nothing
B. Limit Growth
C. Maximize Tributary 8A but allow Flooding Beyond Capacity
D. Construct a Flood Diversion Structure and Overflow Channel
4.1.1. Do Nothing (Alternative A)
Within the framework of a municipal Class EA, it is normal to list “Do Nothing” as an alternative. This
alternative allows comparison of risks to the environment against the other alternatives listed.
4.1.2. Limit Growth (Alternative B)
Usually to be consistent with the alternatives normally included with a municipal Class EA ‘Limit
Growth’ is evaluated. The alternative would assume that limiting growth would address the problem with
the existing stormwater management system, and therefore assumes that the problems are related to
meeting the future demand of the system.
4.1.3. Maximize Tributary 8A but allow Flooding beyond Capacity (Alternative C)
This alternative would attempt to channel all stormwater flows through the existing drainage course and
allow for excess flows to flood beyond Tributary 8A onto neighbouring properties.
This alternative would require the deepening of the existing channel bed by approximately 0.5 m at a
constant slope of 0.2% of the profile, from Frost Avenue to Elmview Drive. The width of the tributary
would also require modification ranging from 2.0 m wide upstream to about 5.0 m wide downstream.
The banks of the tributary would then be sloped at a rate of 1V:3H.
Additional improvements to the tributary would include upgrading deficient culverts under Frost Avenue
through Elmview Drive, and replacing undersized and corrugated culverts with new box culvert type
structures.
Project No. 104012 Page 13
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
4.1.4. Construct a Flood Diversion Structure and Overflow Channel (Alternative D)
The intent of this alternative is to maintain storm flows within Tributary 8A to acceptable flood levels
while diverting excess flow to a new drainage outlet, upstream of Tributary 8A.
To increase the discharge capacity, the existing drainage course would have to be widened and deepened,
similar to Alternative C. As well, road crossings would have to be upgraded by replacing existing
corrugated steel culverts with concrete box culverts.
Flow diversion is proposed by reducing the flow rate to Tributary 8A by means of constructing a channel,
which will follow a drainage easement from Tributary 8A south to Tributary 10.
Finally, adequate elevation at the north end of the drainage channel is required in order to allow proper
drainage and clearance of the sanitary sewer under Dominion Drive, to the south. For discussion
purposes, two (2) locations were evaluated for this alternative: location (a) parallel to Frost Avenue, and
location (b) adjacent to a Hydro Electric Power Commission corridor to the east.
4.2. Description of the Evaluation Methodology Taking the various social and natural environmental aspects of the project into consideration, the four (4)
alternative solutions were comparatively evaluated according to a qualitative, rather than a numerical or
quantitative, assessment. Numerical rankings can pose significant evaluation difficulties. While a
numerical approach may appear to provide a more scientific or precise method of comparing alternative
solutions, developing a common comparative yardstick is usually subject to debate and may result in
controversy over the results.
Subjectivity inherent in many numerical ranking systems can lead to disagreement and focus attention on
rankings and assigning points, rather than concentrating on the primary objective - the comparative
evaluation of each alternative’s strengths and weaknesses to identify the best possible solution to the
identified problem/opportunity.
Therefore, a descriptive or qualitative evaluation was undertaken based on criteria developed within the
following categories of consideration representing the broad definition of the environment described in
the EA Act:
Natural Environment Criteria Considered in the Evaluation of Options
a. Potential effects on water resources including:
Project No. 104012 Page 14
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
i. Fisheries-aquatic habitat (e.g. stream crossings)
b. Potential effects on natural heritage features including:
i. Terrestrial environment (e.g. woodlands)
ii. Environmentally Sensitive Areas (ESAs),
iii. Areas of Natural and Scientific Interest (ANSIs)
iv. Sensitive species habitat (e.g. vulnerable/threatened/endangered or locally/regionally rare
amphibians, birds and other wildlife)
c. Potential effects on environmental management planning considerations
Social/Cultural Environment Criteria Considered in the Evaluation of Options
a. Temporary disruption during construction (i.e. dust, noise, vibration, traffic management, detours,
access to property, maintain existing services).
b. Potential effects on cultural/heritage resources (e.g. archaeological, built heritage, tourist-
recreational, agricultural & aggregate resources)
c. Compatibility with current land uses
d. Compatibility with future land uses including potential for beneficial use (parklands, sports
complex etc)
Economical/Financial Environment Criteria Considered in the Evaluation of Options
a. Estimated capital costs
b. Operating and maintenance efficiencies
Technical Criteria Considered in the Evaluation of Options
a. Constructability (i.e. location, soil conditions)
b. Efficiency of drainage system
c. Ability of alternatives to provide flexibility for unforeseen changes to drainage requirements
d. Flexibility of system to handle future development pressures
Project No. 104012 Page 15
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
e. Ability to use existing infrastructure including proximity to existing services (hydro, municipal
water/sewers, surface drainage etc.)
f. Conflicts or impacts on existing infrastructure
g. Site accessibility from major roadways
The evaluation criteria listed in Table 1 were developed for evaluating the alternatives based on a review
of the Municipal Class EA, project area, and the problems/opportunities statement.
4.2.1. Application of the Evaluation Methodology
The evaluation criteria listed above were applied to the four (4) alternative solutions to determine the
potential effects on the environment taking mitigation measures into consideration. The results are
summarized in Table 1 and expanded upon in more detail as follows.
Project No. 104
012 Page 16
City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
Table 1: Evaluation of Alternative Drainage Improvement Solutions
Natural Environmental
Social/Cultural
Economic/Financial
Technical Alternative Solution
Potential effects to the natural environment. (Vegetation removal, etc.)
Potential effects from construction/ visual/compatibility/ daily operation Potential human health risk Potential capital
cost Operation and
Maintenance Cost Potential structure/site
requirements Potential to reducing impact
of flooding on local properties
Ability to adequately convey stormwater
flows
Evaluation Summary
Alternative A:
Do Nothing
No man-made impacts on the natural environment.
Potential impact from continued flooding on the natural environment.
No impact from construction.
Potential for continued impacts from flooding on properties along Tributary
8A
Minimal costs associated with
general maintenance.
Minimal maintenance but
potential for higher O&M costs in the
future due to failing structures
No structure requirements
Will not reduce risk of flooding
Does not address flooding issues.
Rej
ecte
d
Alternative B:
Limit Growth No man-made impacts on the natural
environment. Potential impact from continued flooding
on the natural environment.
No impact from construction.
Potential for continued impacts from flooding on properties along Tributary
8A
Minimal costs associated with
general maintenance.
Minimal maintenance but
potential for higher O&M costs in the
future due to failing structures
No structure requirements
Will not reduce risk of flooding
Does not address flooding issues.
Rej
ecte
d
Alternative C:
Maximize Tributary 8A but Allow Flooding Beyond Capacity
Potential impact to local vegetation as the banks of the tributary will be modified to
contain improve the drainage area. Flooding of existing area could potentially
continue to impact local homeowners.
Local residents could experience some visual and noise impacts from
the construction of the improvements along Tributary 8A
between Frost Avenue and Elmview Drive.
Similar to Alternative A.
Higher cost from
improvement (concrete box
culverts)
Minimal maintenance but
potential for higher O&M costs in the
future due to failing structures.
Requires the implementation of
concrete box culverts within the Tributary
8A.
Potential for continued flooding to local homes.
Does not address issue of flooding impact to local
homes. Rej
ecte
d
Alternative D (a):
Construct Flood Diversion Structure and Overflow Channel, divert flows east of Frost Avenue
Some tree removal is expected on the easterly side of the new channel to make
room for the improvements. Other improvements could have minimal impact
on the natural environment, similar to Alternative C.
The construction of the earth berm and overflow channel could cause
increased noise and vibration levels to those residents directly adjacent
to the proposed improvements.
The construction of the new overflow channel
could have potential risks to the safety of local
residents.
Highest cost based on
construction of earth berm and
overflow channel
improvement
Low future O&M; limited to
maintaining vegetation in
overflow channel and along
Tributary 8A.
Adequate elevation to construct the drainage channel and provide clearance of sanitary sewer at Dominion
Drive.
Overflow channel to greatly reduce the potential for
flooding on neighbouring property by diverting heavy
volumes of runoff to Tributary 10
Overflow channel will be deepened and widened to accommodate
higher volumes of stormwater.
Satisfies problem statement.
Acc
epte
d
Alternative D (b):
Construct Flood Diversion Structure and Overflow Channel, divert Flows adjacent to Hydro Corridor
Potential to impact vegetation and wildlife as flows would be diverted from tributary 8A to new area. New drainage channel would have to be created for diverted
flows.
Minimal disturbance should be experienced from improvements to be implemented east of Frost Street.
Minimal risk to human health during construction; potential to minimize the
impacts to homes adjacent to Tributary 8A
Minimal costs associated with
general maintenance.
Minimal maintenance but
potential for higher O&M
costs in the future due to failing
structures
Not enough grade to provide drainage
clearance of sanitary sewer line at
Dominion Drive
Lesser degree of flooding risk to local property
owners as excess flows to be diverted to new channel.
Does not address issue completely
Rej
ecte
d
012 Page 17
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City of Greater Sudbury Drainage Improvements - Tributary 8A and Frost Overflow Channel
Municipal Class Environmental Assessment
4.3. Summary of Evaluation of Alternatives Alternative Solution A, Do Nothing: In this case, “Do Nothing” is viewed as not acceptable for solving
the problem. It is not considered an appropriate long term strategy to rely on the existing drainage system
to address an ongoing problem. The drainage analysis revealed that Tributary 8A is incapable of
sustaining flows greater than a 2-year storm event. The community would be exposed to continued
unacceptable risks of flooding associated with heavy rain falls and snowmelts.
This option could also limit the future growth potential of the area due to the requirements on property
owners to implement flood proofing measures.
It is probable that without addressing the problem, one or more of the following circumstances could
result: 1) Major structure failure requiring emergency maintenance repairs; and 2) Major structure failure
resulting in possible risk to human health and property. Therefore, the long term cost to the residents in
the immediate area would be higher than implementing one or more of the upgrading alternatives.
Alternative Solution B, Limit Growth: Similar to the discussion of Alternative A, this alternative does
not address the risks of potential flooding. By not implementing drainage improvements, allowing
additional development to drain into Tributary 8A could potentially result in increased flooding within the
study area. See Figure 4 for illustration of Alternatives A and B.
Alternative Solution C, Maximize Tributary 8A but Allow Flooding Beyond Capacity: The City
recognizes the benefits of improving the flow characteristics of Tributary 8A. By replacing the existing
corrugated culverts with new concrete box culverts, the City could minimize the volume of material that
could get caught in the culvert during the spring thaw, thereby maximizing flows.
This improvement could reduce the risks of flooding on local property owners however the potential for
uncontrolled flooding would remain. This alternative does not satisfy the problem statement. This
alternative is shown in Figure 5.
Alternative Solution D, Construct a Flood Diversion Structure and Overflow Channel: This option
provides the best means of reducing the impacts of flooding to properties adjacent to Tributary 8A. By
constructing a flood diversion structure and an overflow channel, the volume of stormwater that was once
conveyed along Tributary 8A will be better controlled and the potential for future flooding to local home
owners greatly reduced. This option satisfies the objectives of the Class EA. Alternative D is considered
as the preferred option for satisfying the identified flooding issue.
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Figure 4: Alternative A/B -Do Nothing / Limit Growth
Figure 5: Alternative C -Maximize Tributary 8A but Allow Flooding Beyond Capacity
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Municipal Class Environmental Assessment
4.4. Evaluation of Overflow Channel Locations and Diversion Structure Based on the anticipated results of diverting and reducing maximum stormwater flows away from
Tributary 8A, the following two (2) options were evaluated for the placement of the diversion channel:
• Option (a) considers constructing the overflow channel parallel to Frost Avenue, behind the
residential properties; and
• Option (b) considers diverting the excess flows of Tributary 8A easterly to a future drainage
channel, adjacent to a hydro corridor.
Of concern with the construction of the overflow channel is the conflict with the trunk sanitary sewer
crossing Dominion Drive. Therefore, a major requirement for the construction of the channel is that there
be adequate grade elevation at the north end of the channel to allow enough separation at the south end.
Option (a) provides the most gradient possible for the construction of the overflow channel. The weir at
the intersection of Tributary 8A and the Overflow helped because it raised the invert at the upper end and
allows clearance over the sanitary.
Option (b) does not fully address the potential flooding impacts of Tributary 8A to the local area.
Although storm flows would be diverted, adjacent to the hydro corridor, the risk of flooding remains to
other flat properties in the area. As well, because of the natural flow of the land (south to west at 0.20%
grade), diversion easterly runs out of grade before Dominion Drive where the drainage outlet would cross
the sanitary sewer.
The two alternatives are illustrated in Figures 6 and 7.
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Municipal Class Environmental Assessment
Figure 6: Alternative D (a) - Flood Diversion and Overflow Channel, along Frost Avenue
Figure 7: Alternative D (b) - Flood Diversion and Overflow Channel, Divert Flows Easterly
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Municipal Class Environmental Assessment
Diversion Structure: The original diversion structure proposed the construction of a weir to limit the
volume of storm flow to be conveyed through Tributary 8A. As indicated in the January 2006 Drainage
Improvement Report prepared by S.A. Kirchhefer, the weir structure is replaced with a berm and culvert.
The flood diversion structure would consist of a 900mm diameter culvert within an earth berm. The size
of the culvert would limit the flow of water, and any water that could not pass would be diverted to the
overflow channel.
Figure 8: Alternative D - Flood Diversion Structure
Figure 9 shows a typical drainage cross section for the proposed project, while Figure 8 shows a
conceptual flood diversion structure.
Figure 9: Typical Drainage Cross Section
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Municipal Class Environmental Assessment
Figure 10: Alternative D - Flood Diversion Structure and Diversion Channel
Proposed Flood
Diversion Structure
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Municipal Class Environmental Assessment
5.0 SUMMARY OF PREFERRED ALTERNATIVE Improving Tributary 8A to convey 100-year flood events would impact private property owners along its
length and it would require additional property which might not be favourable to homeowners backing on
to the tributary. Therefore, based on the evaluation in Section 4, the preferred alternative is to construct a
flow diversion structure and overflow channel to reduce the risks of flooding to properties along Tributary
8A and to better handle flows from the existing MR 80 drainage outlet. The following discussion
summarizes the preferred alternative to address the objective of the Class EA.
Flood Diversion Structure
This improvement will be constructed directly east of the residential properties on Frost Avenue, at the
intersection of the new overflow channel. The structure will consist of an earth berm and a 900 mm
diameter culvert to convey limited stormwater flows along Tributary 8A. The earth berm will be
constructed to an elevation higher than the regulatory flood line.
When the overflow channel is not conveying excess storm flows, the overflow channel would essentially
be a dry ditch. The proposed improvement will create a reverse grade within the new overflow channel
directly adjacent to the flood diversion structure, where the invert off Tributary 8A is 0.7 m deep.
When storm flows are greater than the 0.7 m invert of Tributary 8A, overflow will be diverted into the
channel and away from private properties along the existing tributary. It is expected that the Tributary 8A
invert will be sufficient to maintain the conveyance of a 5-year storm event, while anything larger will be
convey along the overflow channel down to Tributary 10.
Overflow Channel
This improvement would see the construction of a new overflow channel approximately 1000 m in length.
The channel will be constructed of sufficient dimension to carry the remainder of the storm flow for a
100-year event that Tributary 8A will not be able to convey. The channel would begin at the intersection
of Tributary 8A and the southerly end of the existing MR 80 drainage outlet. The realigned channel will
be located entirely within land acquired by the City.
In support of the preferred solution, a study entitled ‘Proposed Drainage Improvement - Whitson River
Watershed Tributary VIII-A’ was prepared by S.A. Kirchhefer Limited in January 2006. The study
discusses the proposed drainage improvements based on the design drawings prepared by the City of
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Municipal Class Environmental Assessment
Greater Sudbury. The study identifies the effects of the improvements on the regulatory flood elevation
within the study area. A copy of the study is attached to this report for information purposes.
5.1. Upgrade of Inlet Spur to Tributary 10 (Hanmer Drain) Most spurs in the study area were originally excavated with plows and tractors by the current or former
land owners. These spurs were excavated to improve drainage of the properties by providing excess
water with a drainage path to one of the Tributaries.
Currently there are two drainage culverts that run from the north side of Dominion drive to the south and
eventually drain into Tributary 10. The inlet spur that the City proposes to connect to currently collects
storm flow from portions of the Parkwood Subdivision and from roadway ditches along approximately
1.5km of Dominion Drive (east and west of Frost Avenue).
It is expected that upgrading the inlet spur of Tributary 10 will improve the conveyance of excess
stormwater flows away from residential, recreational and institutional properties north of Dominion
Drive, Figure 11. By improving the drainage under Dominion Drive and the inlet spurt, the City
anticipates that the chances of flooding within the study area will be greatly reduced. This alternative,
Figure 12, compliments alternative D and satisfies the objects of the Class EA.
Figure 11: Upgrade of Tributary 10 Inlet Spur
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It should be noted that because flow data for this area has only been modeled, the frequency and
probability of how much flow will be diverted is unknown. The occurrences of flooding are also difficult
to predict because flooding in this area is dependent on many factors, including: soil saturation, rate of
thaw, snow accumulation, to name a few. The spreadsheet in Appendix C illustrates the results of the
Rational Method calculations used to evaluate the proposed improvements.
Figure 12: Preferred Drainage Improvement to Tributary 8A
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Municipal Class Environmental Assessment
6.0 RECOMMENDED MITIGATIVE MEASURES Section 6 presents established mitigative measures. Following the identification of potential impacts
associated with the project, typical mitigation measures are applied and the resultant net effect is
identified. Significant findings of this evaluation are presented below. Based on the evaluation of
potential effects, the drainage improvements to Tributary 8A are not expected to result in any significant
environmental impacts. However, the following mitigative measures are recommended to ensure that any
short-term disturbances are managed by the best available methods.
6.1. Construction Related Impacts Impacts related to construction of the water supply project will be short-term and minor. By
incorporating proper best management practices/construction techniques and controls, these impacts can
be minimized. Anticipated construction related impacts are summarized below along with the associated
mitigating measures. It is recommended that these mitigating measures, identified in Table 2, be
employed to reduce the potential impacts during the construction of the proposed works.
Table 2: Typical Mitigation Measures
Potential Impacts Mitigation Measures Social Considerations
Increase in noise related to construction equipment operation
• Comply with Municipal Noise control by-law. • Maintain equipment in an operating condition that prevents
unnecessary noise, including but not limited to non-defective muffler systems, properly secured components, and the lubrication of moving parts.
• Restrict idling of equipment to the minimum necessary to perform the specified work (no excessive idling).
Increase in dust, fumes, and odours related to excavation, construction equipment operation, etc.
• Ensure that no visible dust from construction operations escape beyond the right-of-way limits and/or causes any reduction in visibility on the roadway.
• The Ministry of the Environment criteria for noxious gases and particulate matter are not expected to be exceeded.
Construction related traffic/access • Maintain access to all entrances/exists within the project throughout the construction period.
• Post signage during the construction period to inform motorists, pedestrians, and cyclists of the following of construction zone limits, anticipated duration of construction, and alternative routes.
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Municipal Class Environmental Assessment
Table 2: Typical Mitigation Measures - Cont’d
Potential Impacts Mitigation Measures Terrestrial Environment
Vegetation and Loss of Cover
Removal or disturbance of significant trees and/or ground flora-landscape features
• Restrict-minimize removal of vegetation.
• All trees to be saved shall be clearly marked.
• Prune roots within excavation area using proper root pruning equipment prior to excavation as to minimize root tear of adjacent trees.
• Replace removed vegetation (no net loss) with approved native species.
Contamination of Soils Through Spills and Leaks
• This can be avoided by ensuring that fuel storage, refueling and maintenance of construction equipment are handled properly and not allowed in or adjacent to watercourses/bodies.
• Contingency plans must be prepared before projects begin for the control and clean up of a spill if one should occur.
Archaeology • If any archaeological and/or historical resources are discovered during the performance of construction work, the performance of the work in the area of the discovery is to halt. The Ministry of Culture (Archaeological Unit) will be notified for an assessment of the discovery. Work in the area of the discovery would not resume until cleared to do so by the Ministry.
6.2. Sediment Control - Erosion Areas of highly erodible soils (associated with location where there is a high potential for sediment
discharge to sensitive areas, such as watercourses) will be identified and investigated. An understanding
of the local site conditions will then be integrated with the following protection principles to develop an
erosion and sediment control plan for the project:
• Apply timing restrictions for work.
• Minimize soil exposure duration.
• Retain existing vegetation, where feasible.
• Encourage revegetation.
• Divert runoff away from exposed soil.
• Keep runoff velocities low.
• Trap sediment as close to the source as possible.
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Municipal Class Environmental Assessment
.3. Standard Mitigation Measures
effects outlined in this section will need to be mon
and beyond, if necessary, to ensure they are performing as intended. The frequency of the monitoring
program will vary depending upon the specifics of the required mitigation measure at a specific location
and will be undertaken accordingly. The following are excerpts from the construction sequencing and
staging section of the Contract Specifications document; additional contractor specifications can be
reviewed in the original document.
• The Contractor must schedule th
Contractor’s responsibility to erect and man detours pursuant to required notification of emergency
services.
The Contr
This project involves the excavation of a new drainage channel and improvements to an existin
Because of the length and dimension of the proposed channels, excavating, grading, compacting and
restoring/stabilizing final surfaces should be completed as one continuous operation.
For all portions of channel construction, the Contractor will be required to excavate t
6 As a condition of the construction contract, the mitigation measures associated with the potential negative
itored throughout the construction phase of the project
e work so that one lane of traffic is maintained at all times. If for any
reason, the Contractor will be required to cut through access of any road then it shall be the
• actor will be allowed to work from 7:00 a.m. to 7:00 p.m. with no restrictions. Extra hours
beyond the normal working day and work on weekends, must be approved by the Roads Engineer.
• g
tributary. These channels can carry substantial flows and must remain open most of the time.
• hen restore with
topsoil/sod or seed/mulch in close succession.
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Municipal Class Environmental Assessment
7.0 SUMMARY OF CONSULTATION PROGRAM
Notification
The public, living within the study area, were informed of the project by way of project notices, and
requested to either attend the upcoming meetings or submit written comment to project staff.
Approximately 225 notices were hand delivered a week before each meeting.
Notification of the project was also advertised in the location newspapers, Sudbury Star, Northern Life
Early consultation with local home owners was met with opposition to the project. Those individuals
living closest to the existing drainage outlet, near MR 80, were most vocal about their disapproval of the
proposed channel; they insisted that the channel should be relocated further away from their properties,
and beyond the land purchased by the City (53R-11763).
Included in Appendix B are the written responses received from those agencies contacted at the
commencement, and throughout, the planning process. Although many of the agencies contacted did not
respond to our request for input, they remain on the project contact list. All contacts were kept informed
throughout the progress of the projects.
Agency Consultation
Notification of the project was mailed to government agencies, as required by the Municipal Class EA,
inviting their comment on the proposed undertaking. The following government agencies were contacted:
• Ministry of the Environment (MOE)
• Ministry of Natural Resources (MNR)
• Ministry of Northern Development and Mines (MNDM)
• Ministry of Citizenship and Leisure (MCL)
• Nickel District Conservation Authority (NDCA)
• Federal Department of Fisheries and Oceans (DFO)
The City met with the NDCA, MNR and DFO to discuss the proposed project and was able to answer
questions and provide clarification on the project.
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Municipal Class Environmental Assessment
The City mailed project notifications to the First Nations identified in the general area of the City of
Greater Sudbury to determine if there were any identified heritage sites. No responses were received.
The Ministry of Aboriginal Affairs, as well as, INAC were contacted later to confirm that there were no
areas of cultural heritage being impacted by this proposed improvement. Again, no comments were
received.
Minutes from the agency meetings are included in Appendix B to this report.
Public Information Centre
The City of Greater Sudbury met with local residents over the last two week in August 2005. Residents
were consulted individually, either on the proposed project site or at their place of residence. The purpose
of the meetings was to present the study and to gain feedback to help scope the study further.
A public meeting was held on September 7, 2005. At that meeting the City committed to investigate the
possibility of acquiring additional land for the possible relocation off the channel. The relocation would
move the channel further east, or would provide additional buffering from the proposed side slope.
A second public meeting was held on October 5, 2005. This meeting was scheduled to inform the
residents in the area that the City had looked at relocating the channel to the east, however it was not
feasible. Again the residents were informed of the Municipal Class EA process, the opportunity to review
the project file and their opportunity to provide comment on the project.
Between the first and second meeting with the public, the City investigated additional land options as
requested, but were unsuccessful.
Minutes from the agency meetings are included in Appendix B to this report.
7.1. Notification of Completion Since this project is being undertaken in accordance with the requirements of Schedule B of the
Municipal Class EA planning process, the first step of implementing the project involves issuing a
‘Notice of Completion’ and filing the project file for public review. The ESD was filed for a 30 calendar
day review period.
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The notice informed individuals of the project’s completion, including the preferred solution and their
rights regarding the Part II Order provisions. Appendix B contains a copy of the notice of completion
letter.
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8.0 RECOMMENDATIONS Based on the results of the study process, and the public and agency consultation process, the following
recommendations are proposed for the implementation of the drainage improvements to Tributary 8A:
1. It is recommended that the City construct a flow diversion structure and overflow channel, east of
Frost Avenue, to convey all flows that cannot be contained within the improved channel of
Tributary 8A.
2. It is recommended that a pre-construction meeting be scheduled to discuss the implementation of
the drainage improvements. This will provide the community with an opportunity to review the
design drawings and provide comment on the final look of the project.
3. It is recommended that consideration be given to providing a drainage improvement area with a
more natural design that will be acceptable to the community.
4. It is recommended that the City address any outstanding concerns related to this project, or
subsequent Part II Order Requests, under separate cover.
Project No. 104012 Page 33