Georgetown Bypass Sound Attenuation Solutions September 22, 2011 - - PowerPoint PPT Presentation

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Georgetown Bypass Sound Attenuation Solutions September 22, 2011 The Purpose of Todays Meeting To discuss the results of the March 10 meeting. To offer concept solutions based on the comments received. General Bypass Alignment

SLIDE 1

Georgetown Bypass

Sound Attenuation Solutions

September 22, 2011

SLIDE 2

The Purpose of Today’s Meeting

To discuss the results of the March 10

meeting.

To offer concept solutions based on the

comments received.

SLIDE 3

General Bypass Alignment

Canewood Subdivision Derby Estates Elkhorn Creek Bypass Alignment

SLIDE 4

Results of Questionnaire - Canewood

Brick Stone Brick and Stone Wood

Attenuation Method Wall Material

Constant Height Varied Height Groupings

Berm Type

Wall/Berm Combination Berm

SLIDE 5

Results of Questionnaire – Derby Estates

Attenuation Method

Berm Wall/Berm

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LEGEND 6’-9’ tall wall 10’-11’ tall wall Hwy 460 Western Elementary School Canewood Golf Course NORTH

Proposed Location of Wall and Berm – Canewood Subdivision

Approximate Wall Location Approximate Berm & Landscaping

SLIDE 7

Retaining Wall / Berm Combination with Landscaping

Proposed Bypass Variable Height Berm Residences Wall Height: 6-19’ (bypass side) 6-11’ (golf course side) Landscaping

Previous Alternate “4B” as preferred by majority of neighborhood residents
Allows for an undulating berm of variable height as preferred by majority of

neighborhood residents

Offers a limited height of wall softened by landscape berm
Maximizes sound attenuation and aesthetics while minimizing impact on golf course

SLIDE 8

Brick / Limestone Noise Wall

SLIDE 9

View From Residents Towards Bypass

SLIDE 10

View From Residents Towards Bypass

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View From Residents Towards Bypass

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View From Residents Towards Bypass

SLIDE 13

Donerail Drive NORTH

Bypass Alignment – Derby Estates Subdivision

Seattle Slew Street Approximate Location of Berm S Bold Forbes Blvd

8’ tall 11’ tall 15’-16’ tall 20’ tall

Cut Line Berm Center Line

SLIDE 14

Berm with Landscaping

Proposed Bypass Residences Variable Height Berm

Previous “berm only” (no wall) solution as preferred by majority of neighborhood

residents

Allows for an undulating berm of variable alignment and height which provides a more

natural aesthetic

Maximizes sound attenuation using available buffer between road and neighborhood

Existing Hedge Row

SLIDE 15

View From Residents Towards Bypass

Donerail Drive Seattle Slew Street S Bold Forbes Blvd

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View From Residents Towards Bypass

SLIDE 17

Georgetown Bypass

Sound Attenuation Solutions

September 22, 2011