1. LIONS BAY MITIGATION PROGRAM
A Presentation for Acoustics’08 Paris, ASA, EAA, SFA
Topic: Euronoise
Session: Action Planning and Global Solutions for Urban Noise
June 30, 2008
Une présentation pour Acoustics'08 Paris, ASA, EAA, SFA
Matière : Euronoise
Session : La Planification d’Action et les Solutions Globales pour le Bruit Urbain
Juin 30, 2008
Lions Bay noise mitigation program
Acoustics’08 Paris, ASA, EAA, SFA
Topic: Euronoise
Session: Action Planning and Global Solutions for Urban Noise
Presented by
D.E. Marriner, M.A.Sc., Project Engineer
Wakefield Acoustics Ltd., Victoria, B.C.
Sponsored by
B.C. Ministry of Transportation
Abstract: Lions Bay noise mitigation program ( )
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Wakefield Acoustics Ltd.

2. Wakefield Acoustics Ltd.
Project Description:
In preparation for the 2010 Olympic and Para-Olympic Games the Sea-to-Sky Highway Improvement Project was initiated in 2005.
The Lions Bay Mitigation Program evolved from a preliminary noise plan based on the BC MoT noise abatement policy which led to a series of community consultations culminating in the Detailed Design.
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Wakefield Acoustics Ltd.

3. Wakefield Acoustics Ltd.
Motivation:
BC MoT Noise Policy [1],
“Mitigation is warranted, and will be carried out where cost-effective, practical and broadly supported by directly-affected residences, wherever the exterior Leq(24) at ground floor level of adjacent residences, ten years after project completion, is predicted to be:
from 55 to 65 dB and exceed pre-project noise levels by a minimum amount which decreases from 10 dB at pre-project level of 45 dB to 3 dB at a pre-project level of 62 dB,
over 65 dB and exceed pre-project noise levels by 3 dB or more.
Mitigation to “achieve minimum reduction in project Leq(24) of 5 dBA noise reduction benefit.
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4. Preliminary Design Consultation (Wakefield Acoustics Ltd, 2006)
Proponent and stakeholders review Preliminary Design and discuss,
Predictions of residential noise levels for baseline 2004 conditions assuming,
existing alignment 2-lane configuration,
Predictions of residential noise levels for a 2018 “do-nothing” scenario assuming,
existing alignment 2-lane configuration
Predictions of residential noise levels for 2018 post-project conditions assuming,
proposed alignment 4-lane configuration,
primary objective of a 5 dBA noise reduction through the use of quiet pavement and a speed reduction from 80 to 70 kmph,
“Best Efforts” towards additional 5 dBA by means of noise barriers up to 5 m (max) height attempted at all locations from the highway median to the residential facades.
Color noise level contours presented at public meetings and posted online.
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Wakefield Acoustics Ltd.

5. Wakefield Acoustics Ltd.
Action Plan to Reduce Urban Traffic Noise Along the Village Corridor through Lions Bay, B.C.
Project to achieve a 5 dBA noise reduction benefit,
through quiet pavement and a speed reduction at residential facades fronting onto the project whose noise levels projected to the design horizon year 2018 approach or exceed Leq(24) 55 dBA.
“Best Efforts” towards, achieving an additional 5 dBA benefit,
by other means at said locations.
Extend these requirements to include to outdoor amenity spaces,
such as elevated sundecks, porches, verandas and patios located typically 25 m or more above project grade.
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6. Detailed Design Consultation (Wakefield Acoustics Ltd, 2007)
Predict residential noise levels, benefits and impacts before and during four noise mitigation stages using computer models including,
Existing 2 lane alignment with 2004 Traffic – Baseline Model,
Existing 2 lane alignment with 2018 Traffic – Base Model,
Pre-mitigation 4 lane alignment - Basic Design Model,
Stage 1 Mitigation - Quiet Pavement and Speed Reduction Model to provide a 5 dBA noise reduction,
“Best efforts” to provide an additional 5 dBA reduction
Stage 2 Mitigation - Spit Grade Model,
Stage 3 Mitigation - Sound Wall Model,
Stage 4 Mitigation - Barrier Enhancement Model.
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7. Detailed Design Consultation (Cont’d) (Wakefield Acoustics Ltd, 2007)
Three Digital Terrain Models
Existing 2-lane configuration,
New alignment 4-lane configuration,
New alignment 4-lane configuration incorporating split grade at the start of the project.
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8. Wakefield Acoustics Ltd.
Figure 3: View from Site 35 depicting Ineffective Sound Wall Options and Roadside 2.3 m High Barrier Enhancement on Span from Stage 4 Mitigation Model
Figure 1: View of Sea-to-Sky from Vancouver End towards Whistler, showing Proposed 4-Lane Configuration with Split Grade
Figure 4: View of Sites 43 to 47 depicting Variable Height Sound Wall Option Along ROW, Continuous 5 m High Sound Wall Option Atop Retaining Wall and Barrier Enhancements at Roadside from Stage 4 Mitigation Model
Figure 2: View from Site 30 depicting Ineffective Sound Wall Options from Stage 3 Mitigation Model
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9. Wakefield Acoustics Ltd.
Figure 5: View from Site 47 depicting Variable Sound Wall Height Transition Details from Stage 4 Mitigation Model
Figure 6: View from Site 49 indicating the Potential for Reflections from 2.3 m High Barrier Enhancement with 5 m High Sound Wall in the Foreground from the Stage 4 Mitigation Model
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10. Acknowledgements: Sponsorship for the Lions Bay Mitigation Program
was provided by the
B.C. Ministry of Transportation with support from Peter Kiewit and Sons’ Inc. and Hatch Mott MacDonald.
Acknowledgements:
Sponsorship for the Lions Bay Mitigation Program was provided by the B.C. Ministry of Transportation (MoT) with the support of Peter Kiewit and Son’s Inc. and Hatch Mott MacDonald.
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11. Wakefield Acoustics Ltd.
References:
Ministry Of Transportation MoTH, Revised Policy for Mitigating the Effects of Traffic Noise from Freeways and Expressways (1993)
References:
Ministry Of Transportation MoTH, Revised Policy for Mitigating the Effects of Traffic Noise from Freeways and Expressways (1993).
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Wakefield Acoustics Ltd.