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

Georgetown Bypass Sound Attenuation Solutions September 22, 2011

The Purpose of Today’s Meeting • To discuss the results of the March 10 meeting. • To offer concept solutions based on the comments received.

General Bypass Alignment Canewood Bypass Alignment Subdivision Derby Estates Elkhorn Creek

Results of Questionnaire - Attenuation Method Canewood Wall/Berm Berm Type Combination Berm Constant Height Varied Height Groupings Wall Material Brick Stone Brick and Stone Wood

Results of Questionnaire – Derby Estates Attenuation Method Berm Wall/Berm

Proposed Location of Wall and Berm – Canewood Subdivision Approximate Wall Location Western Elementary School Approximate Berm & Landscaping Hwy 460 Canewood Golf Course LEGEND 6’-9’ tall wall 10’-11’ tall wall NORTH

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

Brick / Limestone Noise Wall

View From Residents Towards Bypass

View From Residents Towards Bypass

View From Residents Towards Bypass

View From Residents Towards Bypass

Bypass Alignment – Derby Estates Subdivision Approximate Location of Berm Berm Cut Line Center Line 20’ tall 15’-16’ tall 11’ tall 8’ tall Donerail Drive Seattle Slew Street S Bold Forbes Blvd NORTH

Berm with Landscaping Residences Existing Hedge Row Proposed Bypass 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

View From Residents Towards Bypass Donerail Drive Seattle Slew Street S Bold Forbes Blvd

View From Residents Towards Bypass

Georgetown Bypass Sound Attenuation Solutions September 22, 2011