Noise Feasibility Study Stacked Townhouse Development Glenashton Drive (Block 55) Oakville, Ontario Prepared for: Nathan Jamieson, P.Eng Senior Principal, Community Development Stantec Consulting Ltd 300W – 675 Cochrane Drive, West Tower Markham, Ontario L3R 0B8 Prepared by Victor Garcia, EIT Reviewed by Sheeba Paul, MEng, PEng February 18, 2016
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Noise Feasibility Study
Stacked Townhouse Development
Glenashton Drive (Block 55)
Oakville, Ontario
Prepared for:
Nathan Jamieson, P.Eng Senior Principal, Community Development
Stantec Consulting Ltd 300W – 675 Cochrane Drive, West Tower
Figure 1 – Aerial Photo of Site Figure 2 – Proposed Site Plan Showing Prediction Locations Figure 3 – Proposed Site Plan Showing Ventilation Requirements Appendix A – Road Traffic Information Appendix B – Sample STAMSON 5.04 Output
Noise Feasibility Study (Block 55), Stacked Townhouse Development Page 1 Glenashton Drive, Oakville, Ontario February 18, 2016
1 Introduction & Summary
Howe Gastmeier Chapnik Limited (HGC Engineering) was retained by Stantec Inc. to conduct a
noise feasibility study for a proposed residential development (Block 55) to be located south of
Glenashton Drive, west of Trafalgar Road at the end of Lillykin Street, in the Town of Oakville,
Ontario. Areas surrounding the proposed development are mainly residential. The site will consist of
two blocks of stacked townhouses. The study is required by the municipality as part of their planning
and approvals process.
This report is being updated to reflect the latest site plan prepared by Guthrie Muscovitch Architects
dated January 27, 2016. HGC Engineering completed a noise report entitled “Noise Feasibility
September 2, 2015 and addendum letter dated January 7, 2016.
The primary noise sources impacting the site were determined to be road traffic on Glenashton Drive
and Trafalgar Road. Predicted road traffic data for Glenashton Drive and Trafalgar Road were used
to predict future traffic sound levels at the facades of the proposed residential blocks. The predicted
sound levels were compared to the guidelines of the Ministry of Environment and Climate Change
(MOECC), Region of Halton and the Town of Oakville to develop noise control recommendations
for the proposed site.
The sound level predictions indicate that the future road traffic sound levels will exceed MOECC
guidelines at all of the proposed residential units. Central air conditioning is required for dwellings
with direct exposure to Glenashton Drive and/or Trafalgar Road. Forced air ventilation systems with
ductwork sized for the future installation of central air conditioning by the occupant will be required
for the remaining dwellings. The buildings will require building constructions meeting the minimum
requirements of the Ontario Building Code and standard glazing constructions. Warning clauses are
also recommended, to inform future owners and occupants of the dwellings of the traffic noise
impacts.
In summary, with suitable controls integrated into the building plans, it is concluded that this
development is feasible from the perspective of noise impact. Details of the assessment leading to
this conclusion are provided herein.
Noise Feasibility Study, (Block 55), Stacked Townhouse Development Page 2 Glenashton Drive, Oakville, Ontario February 18, 2016
2 Site Description & Noise Sources
The site is situated on the south side of Glenashton Drive, to the west of Trafalgar Road and at the
end of Lillykin Street, in the Town of Oakville, Ontario. Figure 1 shows an aerial photo illustrating
the location of the proposed site. A site plan of the development prepared by Guthrie Muscovitch
Architects dated January 27, 2016 is shown as Figure 2 also showing prediction locations. The
proposed development will consist of two stacked townhouse blocks totalling 36 units.
A site visit was made by HGC Engineering personnel in August 2015 to make observations of the
acoustical environment. The surrounding area is considered to be Class 1 (Urban) in terms of its
acoustical environment. Road traffic on Trafalgar Road and Glenashton Drive were confirmed to be
the dominant sound sources.
There are existing residences in the area surrounding the site. On the northeast corner of the
intersection of Glenashton Drive and Trafalgar Road is a dental clinic and pharmacy contained
within one building. At the northwest corner are vacant lands which may have future residential uses
and a commercial property at the northeast. There are no significant sources of stationary noise
within 500 m of the subject site.
3 Noise Level Criteria
3.1 Road Traffic Noise
Guidelines for acceptable levels of road traffic noise impacting residential developments are given in
the MOECC publication NPC-300, “Environmental Noise Guideline Stationary and Transportation
Sources – Approval and Planning”, Part C release date October 21, 2013, and are listed in Table I
below. The values in Table I are energy equivalent (average) sound levels [LEQ] in units of
A-weighted decibels [dBA].
Noise Feasibility Study, (Block 55), Stacked Townhouse Development Page 3 Glenashton Drive, Oakville, Ontario February 18, 2016
Table I: MOECC Road Traffic Noise Criteria (dBA)
Area Daytime LEQ (16 hour)
Road Nighttime LEQ(8 hour)
Road
Outside Bedroom Windows 55 dBA 50 dBA
Outdoor Living Area 55 dBA --
Inside Living/Dining Room 45 dBA 45 dBA
Inside Sleeping Quarters 45 dBA 40 dBA
Daytime refers to the period between 07:00 and 23:00, while nighttime refers to the period between
23:00 and 07:00. The term "Outdoor Living Area" (OLA) is used in reference to an outdoor patio, a
backyard, a terrace or other area where passive recreation is expected to occur. Balconies that are
less than 4 m in depth are not considered to be outdoor living areas under MOECC guidelines.
The guidelines in the MOECC publication allow the sound level in an OLA to be exceeded by up to
5 dBA, without mitigation, if warning clauses are placed in the purchase and rental agreements to the
property. Where OLA sound levels exceed 60 dBA, physical mitigation is required to reduce the
OLA sound level to below 60 dBA and as close to 55 dBA as technically, economically and
administratively feasible.
A central air conditioning system as an alternative means of ventilation to open windows is required
for dwellings where nighttime sound levels outside bedroom or living/dining room windows exceed
60 dBA or daytime sound levels outside bedroom or living/dining room windows exceed 65 dBA.
Forced-air ventilation with ducts sized to accommodate the future installation of air conditioning is
required when nighttime sound levels at bedroom or living/dining room windows are in the range of
51 to 60 dBA or when daytime sound levels at bedroom or living/dining room windows are in the
range of 56 to 65 dBA.
Building components such as walls, windows and doors must be designed to achieve indoor sound
level criteria when the plane of window nighttime sound level is greater than 60 dBA or the daytime
sound level is greater than 65 dBA due to road traffic noise.
Noise Feasibility Study, (Block 55), Stacked Townhouse Development Page 4 Glenashton Drive, Oakville, Ontario February 18, 2016 Warning clauses to notify future residents of possible excesses are also required when nighttime
sound levels exceed 50 dBA at the plane of the bedroom or living/dining room window and daytime
sound levels exceed 55 dBA in the outdoor living area and at the plane of the bedroom or
living/dining room window due to road traffic.
4 Traffic Noise Predictions
4.1 Road Traffic
Glenashton Drive is a collector roadway and Trafalgar Road is an arterial roadway in the Town of
Oakville. Ultimate road traffic data for Glenashton Drive was determined by obtaining the predicted
2021 peak hour traffic volume from a traffic brief produced by Stantec, Community Development.
The data was projected by 2.5% per year to the year 2026 to anticipate the noise impact from future
road traffic. Ultimate road traffic data for Trafalgar Road was obtained from the Region of Halton,
Public Works Department. The relevant road traffic data and traffic brief memo are provided in
Appendix A. For both Glenashton Drive and Trafalgar Road, a commercial vehicle percentage of
10%, split into 5% medium trucks and 5% heavy trucks, as well as a day/night split of 90%/10%,
was used in the analysis. Posted speeds of 50 kph and 60 kph were used for Glenashton Drive and
Trafalgar Road, respectively. The resulting future traffic volumes are listed in Table II.
To assess the levels of road traffic noise which will impact the site in the future, predictions were
made using STAMSON version 5.04, a computer algorithm developed by the MOECC. Sample
STAMSON output is included in Appendix B.
Noise Feasibility Study, (Block 55), Stacked Townhouse Development Page 5 Glenashton Drive, Oakville, Ontario February 18, 2016 Prediction locations were chosen around the residential site to obtain a good representation of the
future sound levels at the units with exposure to Glenashton Drive and Trafalgar Road. Sound levels
were predicted in the plane of the 4th storey windows during daytime and nighttime hours to
investigate ventilation and building façade construction requirements. The results of these
predictions are summarized in Table III.
Table III: Predicted Road Traffic Sound Levels [dBA], Without Mitigation
Prediction Location
Description Daytime – at
Façade LEQ(16)
Nighttime – at Façade LEQ(8)
1A Block 1, north façade with exposure to Glenashton Drive, some exposure to Trafalgar Road
67 60
1B Block 1, east façade with exposure to Trafalgar Road, some exposure to Glenashton Drive
67 60
1C Block 1, south façade with some exposure to Trafalgar Road
63 56
2A Block 2, north façade with some exposure to Glenashton Drive and Trafalgar Road
62 55
2B Block 2, east façade with some exposure to Glenashton Drive and Trafalgar Road
66 59
5 Traffic Noise Recommendations
The predictions indicate that the future traffic sound levels will exceed MOECC guidelines at all the
dwelling units in the development. Recommendations for ventilation and noise warning clauses to
achieve the noise criteria stated in Table I are discussed below.
5.1 Outdoor Living Areas
All the dwelling units in the development are stacked townhouse units. The dwelling units may
include small patios or balconies less than 4 m in depth which are not considered to be outdoor living
areas. These areas are excluded from noise assessment. There are no requirements for acoustic
barriers. The site plan does not indicate any common outdoor amenity areas.
Noise Feasibility Study, (Block 55), Stacked Townhouse Development Page 6 Glenashton Drive, Oakville, Ontario February 18, 2016 5.2 Indoor Living Areas & Ventilation Requirements
Central Air Conditioning
The predicted sound levels outside the dwellings fronting onto Glenashton Drive and/or with
flanking exposure to Trafalgar Road (prediction locations [1A], [1B] and [2B]) will be greater than
65 during the daytime hours. To address these excesses, the MOECC guidelines recommend that
these dwellings be equipped with central air conditioning systems, so that the windows can be
closed.
Provision for the future installation of Air Conditioning
The predicted future daytime sound levels outside the plane of the living/dining room windows of
the remaining dwellings will be between 56 and 65 dBA and the nighttime sound levels outside the
plane of the bedroom windows will be between 51 and 60 dBA. To address this excess, the MOECC
guidelines recommend that these dwelling units be equipped with a forced air ventilation systems
with ducts sized to accommodate the future installation of air conditioning by the occupant. Window
or through-the-wall air conditioning units are not recommended for any commercial or residential
units because of the noise they produce and because the units penetrate through the exterior wall
which degrades the overall noise insulating properties of the envelope. The location, installation and
sound ratings of the outdoor air conditioning devices should minimize noise impacts and comply
with criteria of MOECC publication NPC-300, as applicable. The guidelines also recommend
warning clauses for units with ventilation requirements. Inclusion of central air conditioning will
meet or exceed the requirements. Figure 3 shows the ventilation requirements for the proposed
development.
5.3 Building Façade Constructions
Future sound levels at some of the facades of the blocks will exceed 65 dBA during daytime hours.
MOECC guidelines recommend that the windows, walls and doors be designed so that the indoor
sound levels comply with MOECC noise criteria.
The required building components are selected based on the Acoustical Insulation Factor (AIF) value
for road traffic. To do so, calculations were performed to determine the acoustical insulation factors
to maintain indoor sound levels within MOECC guidelines. The calculation methods were developed
Noise Feasibility Study, (Block 55), Stacked Townhouse Development Page 7 Glenashton Drive, Oakville, Ontario February 18, 2016 by the National Research Council (NRC). They are based on the predicted future sound levels at the
building facades, and the anticipated area ratios of the facade components (windows and walls) and
the floor area of the adjacent room.
The minimum necessary specification for the building envelope is AIF-27 for living/dining/family
rooms on the north and east façade of Block 1 and the east façade of Block 2, and OBC for
bedrooms, based on the possibility of sound entering the buildings through windows and walls.
Floor plans and building elevations were not available at the time of this study. Any well sealed
thermopane unit having a Sound Transmission Class (STC) rating of 30, that is two 3 mm panes and
a 13 mm inter-pane gap will provide sufficient noise insulation as long as the window to floor area
ratio is less than 50% for living/dining and family rooms.
Any exterior wall construction meeting the Ontario Building Code (OBC) will be acceptable for the
townhouse blocks. Any insulated metal exterior door meeting OBC requirements will be sufficient to
provide noise insulation. If sliding patio doors are to be used in the dwellings, they must be included
in the window area.
When detailed floor plans and elevations are available for the townhouse blocks, a detailed noise
study should be performed to specify wall and window requirements with sufficient acoustical
insulation for the dwelling units based on actual window to floor area ratios.
The remaining units within the development will have daytime and nighttime sound levels at the top
storey façade that are less than 65 and 60 dBA respectively. For these units, any double glazed
window construction meeting the minimum requirements of the Ontario Building Code (OBC) will
provide adequate sound insulation for the dwelling units.
Noise Feasibility Study, (Block 55), Stacked Townhouse Development Page 8 Glenashton Drive, Oakville, Ontario February 18, 2016 5.4 Warning Clauses
The MOECC guidelines recommend that warning clauses be included in the property and tenancy
agreements for the proposed residential buildings with anticipated traffic sound level excesses.
Suggested wording for future dwellings with sound levels exceeding the MOECC criteria is given
below.
Type A: Purchasers/tenants are advised that despite the inclusion of noise control features in the development and within the building units, sound levels due to increasing road traffic may on occasion interfere with some activities of the dwelling occupants, including any raised patio and/or balcony, as sound levels exceed the sound level limits of the Municipality and the Ministry of the Environment and Climate Change.
Suggested wording for future dwellings requiring central air conditioning systems is given below.
Type B:
This dwelling unit has been supplied with a central air conditioning system which will allow windows and exterior doors to remain closed, thereby ensuring that the indoor sound levels are within the sound level limits of the Municipality and the Ministry of Environment and Climate Change.
Suggested wording for future dwellings requiring forced air ventilation systems is given below.
Type C: This dwelling unit has been designed with the provision for adding central air conditioning at the occupant’s discretion. Installation of central air conditioning by the occupant in low and medium density developments will allow windows and exterior doors to remain closed, thereby ensuring that the indoor sound levels are within the sound level limits of the Municipality and the Ministry of the Environment and Climate Change.
These sample clauses are provided by the MOECC as examples and can be modified by the
Municipality as required.
Noise Feasibility Study, (Block 55), Stacked Townhouse Development Page 9 Glenashton Drive, Oakville, Ontario February 18, 2016
6 Summary of Recommendations
The following recommendations are provided in regard to noise mitigation for road traffic noise for
the proposed development.
1. Central air conditioning is required for the dwellings with direct exposure to Glenashton Drive
and/or Trafalgar Road. Forced air ventilation with ducts sized for the future installation of air
conditioning by the occupant will be required for the remaining dwelling units. Inclusion of
central air conditioning will meet and exceed this requirement.
2. Upgraded window glazing constructions are require for dwellings with direct exposure to
Glenashton Drive and/or Trafalgar Road. For the remaining dwellings, any building construction
meeting the minimum requirements of the Ontario Building Code will provide sufficient
acoustical insulation for the indoor spaces.
3. Warning clauses should be included in the property and tenancy agreements and offers of
purchase and sale to inform the future residents of the development of the noise issues and the
presence of the roadways.
The reader is referred to the previous sections of the report where these recommendations are
discussed in more detail.
Noise Feasibility Study, (Block 55), Stacked Townhouse Development Page 10 Glenashton Drive, Oakville, Ontario February 18, 2016
Table IV: Summary of Noise Control Requirements and Noise Warning Clauses
Block No. Façade Ventilation
Requirements *
Types of Warning Clauses
Building Façade Constructions
1 North & east Central A/C A, B LRDR: AIF-27
BR: OBC 1 South & west Forced Air A, C OBC
2 East Central A/C A, B LRDR: AIF-26
BR: OBC
2 North, south &
west Forced Air A, C OBC
Notes: -- No specific requirements. *The location, installation and sound rating of the air conditioning condensers must be compliant with MOECC guidelines NPC-300, as applicable. OBC – Ontario Building Code LRDR – Living room/dining room BR – Bedroom
6.1 Implementation
To ensure that the noise control recommendations outlined above are fully implemented, it is
recommended that:
1. When architectural plans are available for dwellings with direct exposure to Glenashton
Drive and/or Trafalgar Road, an acoustical consultant should review the plans to determine
appropriate glazing constructions.
2. Prior to assumption, an acoustical consultant shall verify that the noise control measures have
been implemented.
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Figure 1. Aerial Photo of Site
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Site (Block 55)
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Figure 2 - Proposed Site Plan Showing Prediction Locations
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1A
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1B
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1C
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2A
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2B
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Figure 3 - Proposed Site Plan Showing Ventilation Requirements
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LEGEND
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Central air conditioning required
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Forced air heating with ducts sized for the future installation of air conditioning by the occupant is required
AM Peak Hour 123 Figure 6PM Peak Hour 123 N.T.S. 2021 Future Total Traffic Volumes
N
Sheeba Paul 25/02/2014 4:22 PM1
Sheeba Paul
From: Krusto, Matt <[email protected]>Sent: February-25-14 4:21 PMTo: Sheeba PaulSubject: RE: traffic data request, Trafalgar Road, Oakville, ON
Hi Sheeba! The data used for the Sheridan College noise study (2012) is applicable and from the same area of Trafalgar Road. Trafalgar Road: 2013 AADT – 38,500 2031 AADT – 58,400 Posted Speed Limit – 60 km/h Lanes by 2031 – 6 Trucks – 5% medium, 5% heavy
Matt Krusto | Transportation Co-ordinator Transportation Services Public Works Department, Region of Halton E: [email protected] | T: 905-825-6000 x 7225
From: Sheeba Paul [mailto:[email protected]] Sent: Tuesday, February 25, 2014 4:07 PM To: Krusto, Matt Subject: RE: traffic data request, Trafalgar Road, Oakville, ON Hello Matt, HGC Engineering is performing a noise study for a proposed residential building in the Town of Oakville. Please find attached a Google link for your reference. https://maps.google.ca/maps?q=1229+Marlborough+Court,+Oakville,+ON&hl=en&ll=43.46812,‐79.686027&spn=0.025135,0.055747&sll=43.714127,‐79.445858&sspn=0.012516,0.027874&oq=1229+marl&hnear=1229+Marlborough+Ct,+Oakville,+Ontario+L6H+3B6&t=m&z=15 We would like to request road traffic volumes, ultimate AADT for Trafalgar Road (between Upper Middle Road and QEW), along with commercial vehicle percentages (medium and heavy trucks) and speed. Thank you. Ms. Sheeba Paul, MEng, PEng Senior Engineer, Associate
APPENDIX B
Sample STAMSON 5.04 Output
A.TXTSTAMSON 5.0 NORMAL REPORT Date: 18-02-2016 09:01:25MINISTRY OF ENVIRONMENT AND ENERGY / NOISE ASSESSMENT
Filename: 1_1a.te Time Period: Day/Night 16/8 hours
* Refers to calculated road volumes based on the following input:
24 hr Traffic Volume (AADT or SADT): 7700 Percentage of Annual Growth : 2.50 Number of Years of Growth : 5.00 Medium Truck % of Total Volume : 5.00 Heavy Truck % of Total Volume : 5.00 Day (16 hrs) % of Total Volume : 90.00
Data for Segment # 1: Glenashton (day/night)--------------------------------------------Angle1 Angle2 : -90.00 deg 90.00 degWood depth : 0 (No woods.)No of house rows : 0 / 0 Surface : 1 (Absorptive ground surface)Receiver source distance : 16.52 / 16.52 mReceiver height : 10.50 / 10.50 mTopography : 1 (Flat/gentle slope; no barrier)Reference angle : 0.00
* Refers to calculated road volumes based on the following input:
24 hr Traffic Volume (AADT or SADT): 58400 Percentage of Annual Growth : 0.00 Number of Years of Growth : 10.00 Medium Truck % of Total Volume : 5.00 Heavy Truck % of Total Volume : 5.00 Day (16 hrs) % of Total Volume : 90.00
Data for Segment # 2: Trafalgar (day/night)-------------------------------------------Angle1 Angle2 : 0.00 deg 90.00 degWood depth : 0 (No woods.)No of house rows : 0 / 0 Surface : 1 (Absorptive ground surface)Receiver source distance : 65.00 / 65.00 mReceiver height : 10.50 / 10.50 m
Page 1
A.TXTTopography : 1 (Flat/gentle slope; no barrier)Reference angle : 0.00