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									                       McCORMICK                                            1145 Hunt Club Road, Suite 300
                                                                                 Ottawa, Ontario K1V 0Y3
                         RANKIN                                                        Tel: (613) 736-7200
                                                                                      Fax: (613) 736-8710
                      CORPORATION                                                  E-mail: mrc-ott@mrc.ca
                                                                                     Website: www.mrc.ca



MEMO TO FILE
 RE:                  Mississauga Transitway EA Addendum
                      City Centre Area Noise Analysis
 OUR FILE:            W.O. 5447
 PREPARED BY:         Kimberley Hunton
 REVIEWED BY:         Greg Moore, MRC
 COPIES:              Steve Schijns, MRC
                      Andrew Shea, MRC
                      Leslie Scott, MRC
 DATE:                August 27, 2004
 SUBJECT:             Noise Assessment – Residential Houses on Harrowsmith Drive



1.     Introduction

As part of the Mississauga Transitway EA Addendum, MRC is investigating alternatives to the
approved 1992 plan in the EA. In the City Centre area, the original Transitway alignment was to be
located in a tunnel under Highway 403 and the Mississauga City Centre/Square One Shopping Centre.
In an effort to reduce the costs and disruption due to construction of a tunnel section in a heavily
developed area, the current proposal includes an alignment in the City Centre area that is largely at-
grade and crossing Highway 403 at the proposed Confederation Parkway overpass. This crossing
would require a loop ramp in the northeast quadrant to achieve the necessary elevation to meet the
Confederation Parkway overpass. Due to constraints in land availability, this loop ramp comes in close
proximity to the residential development on Harrowsmith Drive. Given the close proximity of the loop
ramp to these houses, a noise analysis was undertaken to determine the potential noise impacts of the
transitway at these houses. This memorandum summarizes the findings of the noise analysis. The
study area is shown in Figure 1.

2.     Methodology

STAMINA 2.0 was used to assess the noise levels given the complexity of the new transitway
alignment and the proposed Confederation Parkway overpass. STAMINA 2.0 was developed based on
the FHWA Highway Noise Prediction Model and is approved for use in Ontario by Ministry of the
Environment and the Ministry of Transportation. The program is used to predict noise levels generated
from road sources at the outdoor activity areas (typically backyards) of Noise Sensitive Areas (NSAs).
It considers numerous variables including traffic volumes, percentage of trucks, distance from roadway,
road grade, posted speed, topography, barriers and vegetation.
RE:        City of Mississauga
           Mississauga Transitway EA Addendum
           Noise Analysis – Residential Houses on Harrowsmith Drive
Date:      August 27, 2004                                            Page 2


Figure 1
RE:            City of Mississauga
               Mississauga Transitway EA Addendum
               Noise Analysis – Residential Houses on Harrowsmith Drive
Date:          August 27, 2004                                                                        Page 3


Noise levels are predicted in decibels in the A-weighted dBA scale, which best approximates the human
perception of sound over a specified time period. An increase of 2-3 decibels in noise levels is
considered to be just perceivable to the average person. It should be noted that a 3 dBA increase in
noise equates to a doubling of traffic volumes.

2.1       Ministry of the Environment (MOE) / Ministry of Transportation (MTO) Guidelines

Since roadway sound levels vary over time, the noise descriptor used in Ontario to assess noise is the
equivalent sound level, Leq. Leq is identified as the continuous sound level, which has the same energy
as a time varying sound level over a specified time period.

Based on the Ministry of Environment (MOE) / Ministry of Transportation (MTO) Noise Protocol,
where a new or expanded roadway is proposed adjacent to a Noise Sensitive Area (NSA), the MOE
requires that the future noise level with and without the facility be compared. Where increases in noise
levels are predicted, the following actions are recommended:
      •   0 to 5 dBA increase     -      no action is required
      •   greater than 5 dBA      -      investigate noise control measures within the right-of-way
If project cost is not significantly affected, noise control measures should be introduced within the
right-of-way. Where introduced, noise control measures should achieve a minimum of 5 dBA
attenuation over the first row receivers. Noise control measures should mitigate to ambient, as
administratively, economically and technically feasible.

3.        Noise Analysis

3.1       Noise Sensitive Areas

As shown in Figure 2, there is a residential subdivision immediately north of the transitway loop ramp
in the northeast quadrant of the proposed Highway 403 / Confederation Parkway overpass. Within this
subdivision, there are approximately 25 houses on Harrowsmith Drive that back onto the Highway 403
corridor. It should be noted, however, that there is a hydro corridor located on the north side of
Highway 403 right-of-way. Due to location of this hydro corridor, the houses are separated from
Highway 403 and are located approximately 170 m away from the highway. The transitway loop ramp
runs adjacent to approximately 15 of these houses. Receivers A to C represent these houses and are
shown in Figure 2.
RE:        City of Mississauga
           Mississauga Transitway EA Addendum
           Noise Analysis – Residential Houses on Harrowsmith Drive
Date:      August 27, 2004                                            Page 4

Figure 2
RE:          City of Mississauga
             Mississauga Transitway EA Addendum
             Noise Analysis – Residential Houses on Harrowsmith Drive
Date:        August 27, 2004                                                                    Page 5


3.2     Noise Modelling

The proposed Confederation Parkway and North Collector Roadway are under the jurisdiction of the
City of Mississauga and are subject to a separate study and approval under the Ontario EA Act. The
study of the Confederation Parkway is anticipated to commence in 2005/2006. Therefore, due to the
uncertain timing in future infrastructure in the vicinity of the transitway loop ramp, a number of
scenarios were reviewed for the purposes of analysis. As such, noise modelling was carried out for the
following scenarios using STAMINA 2.0 to determine the potential noise impacts of the transitway at
the residential houses on Harrowsmith Drive.
  Scenario 1 - 2007 – Highway 403, Confederation Parkway (for comparison purposes only)

  Scenario 2a - 2017 – Highway 403, Confederation Parkway – without transitway
  Scenario 2b - 2017 – Highway 403, Confederation Parkway – with transitway

  Scenario 3a - 2017 – Highway 403, Confederation Parkway, North Collector Roadway – without
                transitway
  Scenario 3b - 2017 - Highway 403, Confederation Parkway, North Collector Roadway – with
                transitway
It should be noted that a berm is located on the north side of Highway 403. However, it is anticipated
that this berm will be removed with the construction of the North Collector Road. For the purposes of
analysis, the noise modelling did not consider the berm in order to represent a worst-case scenario.
The potential noise impacts with removing the berm will require a detailed review during the future EA
for the construction of the North Collector Roadway.

The potential noise attenuation from installing a noise wall along the residents’ property line was
reviewed for the purposes of analysis. The Peel, Mississauga, Brampton – Harmonization of Noise
Wall Standards and Specifications indicates that “the minimum and maximum height for retrofit and
local improvement noise walls shall be 2.0 m and 2.4 m respectively. However, consideration will be
given to local conditions.” Given this, a 2.4 m noise wall was reviewed along the property line as
shown on Figure 2.
The traffic volumes used in this analysis are summarized in Table 1. The basic assumptions and factors
used in the analysis are summarized in Table 2.
RE:          City of Mississauga
             Mississauga Transitway EA Addendum
             Noise Analysis – Residential Houses on Harrowsmith Drive
Date:        August 27, 2004                                                                                                      Page 6

                                                    Table 1: Traffic Volumes Used in the Analysis
                                         Highway 403          Confederation Parkway        RBL      N. Collector    N/S-W Ramp   E-N/S
                                      EB            WB            NB          SB                     Roadway                     Ramp
     1hr Auto                        2589           2576         549          549
     1hr MT                            50            53           18           18
Sc. 1




                                                                                                               NA
     1hr Bus                           0              4            3            3
     1hr HT                           160            165          18           18
     1hr Auto                        4048           3901         580          580
Sc. 2a




     1hr MT                            77            83           19           19
                                                                                                               NA
     1hr Bus                           0             25            3            3
     1hr HT                           243            258          19           19
     1hr Auto                        4048           3901         580          580                       470            280        280
Sc. 2b




     1hr MT                            77            83           19           19                        15             9          9
     1hr Bus                           0             25            3           3            NA            0             0          0
     1hr HT                           243            243          19           19                        15             9          9
     1hr Auto                        4048           3926         580          580             0
Sc. 3a




     1hr MT                            77            83           19           19             0
                                                                                                                        NA
     1hr Bus                           0              0            3           3             25
     1hr HT                           243            258          19           19             0
     1hr Auto                        4048           3926         580          580            0          470            280        280
Sc. 3b




     1hr MT                            77            93           19           19             0          15             9          9
     1hr Bus                           0              0            3           3             25           0             0          0
     1hr HT                           243            258          19           19             0         15              9          9
Note: The 1 hr traffic volumes were calculated by taking AADT/24.
RE:               City of Mississauga
                  Mississauga Transitway EA Addendum
                  Noise Analysis – Residential Houses on Harrowsmith Drive
Date:             August 18, 2004                                                                                      Page 7




                                       Table 2: Factors used in Noise Analysis
        Factor                                                   Assumptions
Noise Descriptor              Leq (24 hr)
Receptor Height               1.5 m above the ground
Posted Speed                  Confederation Parkway                    60 km/h
                              Highway 403                              100 km/h
                              Transitway Main                          80 km/h
                              Transitway Loop                          30 km/h                   Adjusted to 50 km/h*
                              North Collector Roadway                  90 km/h
                              N/S-W Ramp at Confederation              60 km/h
                              E-N/S Ramp at Confederation              60 km/h
Traffic Volumes               See Table 3
* The STAMINA program has a minimum posted speed input of 50 km/h therefore where the posted speed was less than 50
km/h the posted speed data input was adjusted to 50 km/h.

4.           Results and Findings

Noise levels were calculated at the selected receiver locations with and without noise mitigation. Table
3 and 4 summarizes the results of these calculations. STAMINA output sheets for the calculated noise
levels are attached.
                                    Table 3: Summary of Calculated Noise Levels (No Mitigation)
                                                         dBA Leq (24 hr)
                   Year 2007                        Year 2017                                         Year 2017
 Receiver       • Highway 403      • Highway 403                                     • Highway 403
                • Confederation    • Confederation Parkway                           • Confederation Parkway
                   Parkway                                                           • North Collection Roadway
                 No Transitway         No              With           Difference    No Transitway         With         Difference
                  (Scenario 1)     Transitway       Transitway                       (Scenario 2a)     Transitway
                                  (Scenario 2a)    (Scenario 2a)                                      (Scenario 3b)
Receiver A           63.8             64.9             65.2             +0.3             65.0             65.3           +0.3

Receiver B           61.5             63.2             63.5             +0.3             63.4             64.2           +0.8

Receiver C           61.4             63.2             63.5             +0.3             63.2             63.6           +0.4


                                         Table 4: Noise Levels with 2.4 m Noise Wall
                                                       dBA Leq (24 hr)
                                      Receiver A                        Receiver B                        Receiver C

Scenario 1: 2007 Hwy 403, Confederation Parkway, no transitway
No Mitigation                            63.8                              61.5                              61.4
2.4 m wall                               61.4                              55.4                              57.0
                                               1
Reduction                               -2.4                               -6.1                              -4.42
Scenario 2a: 2017 Hwy 403, Confederation Parkway, no transitway
No Mitigation                            64.9                              63.2                              63.2
2.4 m wall                               62.2                              56.8                              58.8
                                               1
Reduction                               -2.7                               -6.4                              -4.42
Scenario 2b: 2017 Hwy 403 Confederation Parkway, with transitway
No Mitigation                            65.2                              63.5                              63.5
2.4 m wall                               62.4                              57.1                              59.0
RE:               City of Mississauga
                  Mississauga Transitway EA Addendum
                  Noise Analysis – Residential Houses on Harrowsmith Drive
Date:             August 27, 2004                                                                                                  Page 8

                                             Table 4: Noise Levels with 2.4 m Noise Wall
                                                           dBA Leq (24 hr)
                                          Receiver A                        Receiver B                              Receiver C
                                                    1
Reduction                                    -2.8                                 -6.4                                 -4.52
Scenario 3a: 2017 Hwy 403 Confederation Parkway, North Collector, no transitway
No Mitigation                                65.0                                 63.4                                 63.2
2.4 m wall                                   62.2                                 56.9                                 58.8
                                                    1
Reduction                                    -2.8                                 -6.5                                 -4.42
Scenario 3b: 2017 Hwy 403 Confederation Parkway, North Collector, with transitway
No Mitigation                                65.3                                 64.2                                 63.6
2.4 m wall                                   62.5                                 57.2                                 59.1
                                                    1
Reduction                                    -2.8                                 -7.0                                 -4.52
Notes:
1
  In order to obtain a 5 dBA noise reduction at Receiver A, a 4.0 m noise barrier would be required. This is due to the proximity of the
receiver to Confederation Parkway overpass.
2
  A 3.0 m barrier would be required at Receiver C to obtain a 5 dBA noise reduction. This is due to the elevation drop at the property line
close to the receiver.

In summary, the findings of the noise analysis of the Mississauga Transitway at the residential houses
on Harrowsmith Drive are as follows:
      •     The projected noise level increases with the transitway in year 2017 for the scenario with
            Highway 403 and Confederation Parkway are predicted to be +0.3 dBA.
      •     The projected noise level increases as a result of the transitway in year 2017 for the scenario
            with Highway 403, Confederation Parkway and the North Collector Road are predicted to
            range from +0.3 to +0.8 dBA.
      •     There is an imperceptible difference (i.e. less than or equal to 1.0 dBA) given that traffic noise
            from Highway 403 is the dominant noise source at the receivers, regardless of the transitway.
      •     A noise wall being 2.4 m high along the residents’ property line is predicted to reduce noise
            levels by 2.4 dBA to 2.8 dBA at Receiver A due to the close proximity to the Confederation
            Parkway overpass. A 4.0 m noise wall is predicted to achieve a 5 dBA reduction at Receiver
            A.
      •     A 2.4 m noise wall along the residents’ property line is predicted to reduce noise levels by 6.1
            dBA to 7.0 dBA at Receiver B.
      •     A 2.4 m noise wall along the residents’ property line is predicted to reduce noise levels by 4.4
            dBA to 4.5 dBA at Receiver C. A 3.0 m noise wall is predicted to achieve a 5 dBA reduction
            at Receiver C.
5.          Conclusions

The conclusions of the noise assessment for the Mississauga Transitway at the residential houses on
Harrowsmith Drive are as follows:
      •     The dominant noise source is and will continue to be Highway 403
      •     The projected changes in noise levels as a result of the proposed transitway are less than 1 dBA
            (i.e. less than 5 dBA).
      •     Therefore, the consideration of noise mitigation is not required based on MOE criteria.
RE:                      City of Mississauga
                         Mississauga Transitway EA Addendum
                         Noise Analysis – Residential Houses on Harrowsmith Drive
Date:                    August 27, 2004                                                                                                                             Page 9

      •      Future noise level increases as a result of the transitway construction are considered to be
             imperceptible to the average human ear (e.g. lower than 3 dBA).
      •      The provision of installing a noise wall along the residents’ property line was reviewed for the
             purposes of analysis. The findings of this review are provided in Section 4.



 File: I:\Work Order File\5447 EA Addendum - City Centre Station Review\5447-700 Planning\Noise Assessment\5447 kmgm - Mississauga Transitway - Noise Assessment -
 Technical Memo - Working Draft-Aug 30-04.doc

								
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