West Northern Lights Boulevard – Sound Barrier Improvements August 16, 2006

1. West Northern Lights Boulevard – Sound Barrier ImprovementsAugust 16, 2006 Meeting Purpose: A Forum to Share and Gather Information The Municipality of Anchorage Project Management and Engineering Dept. and CRW Engineering Group, LLC

2. Introduction • Rebecca Campbell, CRW Engineering • Steve Gillette, PM&E West Northern Lights Blvd. Sound Barrier Improvements

3. Overview Study Area • West Northern Lights Boulevard – Forest Park Drive to Arlington Drive West Northern Lights Blvd. Sound Barrier Improvements

4. Noise Study Study Results • One 24 hour monitor was set at 2050 Churchill Drive (Ldn) • Numerous Spot Measurements were taken along the study area. (LEQ) • The Equivalent Level (LEQ)- represents the average noise level for an entire hour • The Day-Night Level (Ldn) – 24 hour weighted noise average West Northern Lights Blvd. Sound Barrier Improvements

5. Noise Study Study Results • 24 Hour average (Ldn) at 2050 Churchill Drive was 78 decibels (dBA) • The standard noise criteria for residential developments are: • Ldn 60 dBA normally acceptable • Ldn 65 dBA conditionally acceptable • Ldn 70 dBA normally unacceptable • Ldn 75 dBA unacceptable West Northern Lights Blvd. Sound Barrier Improvements

6. Noise Study Noise Study Results Peak Hour LEQ

7. Noise Barrier Options Sound Barrier Goals • Reduce sound levels by 10 decibels • Provide a cost effective solution that will benefit the maximum number of residences • Maintain the aesthetic properties of Northern Lights Boulevard • Maintain the aesthetic qualities of the residences West Northern Lights Blvd. Sound Barrier Improvements

8. Noise Barrier Options Design Factors • Noise Levels • Location and Height • Barrier Material • Utility Impacts • ROW Impacts • Construction Access • Cost West Northern Lights Blvd. Sound Barrier Improvements

9. Noise Barrier Options Location and Height • Location • Located where the barrier will provide maximum noise reduction • In cut sections, the barrier is most effective at the top of the cut slope • Safety must be considered • Height • High enough to block the line of sight of traffic West Northern Lights Blvd. Sound Barrier Improvements

10. Preferred Location for Maximum Noise Reduction

11. Section A-A

12. Section B-B

13. Noise Barrier Options Barrier Material • Earthen Berm • Wooden Wall • Masonry Wall • Synthetic Wall West Northern Lights Blvd. Sound Barrier Improvements

14. Noise Barrier Material Wooden Barrier Wooden Barrier - New Seward Highway North of DeArmoun Wooden Barrier - Glenn Highway East of Bragaw Street West Northern Lights Blvd. Sound Barrier Improvements

15. Noise Barrier Material Synthetic Wall C Street North of Dimond Muldoon Road at James Drive West Northern Lights Blvd. Sound Barrier Improvements

16. Noise Barrier Costs 1 Estimated Total Length of Wall Required = 1,200 feet 2 Available budget is $150,000 West Northern Lights Blvd. Sound Barrier Improvements

17. Summary Project Schedule • Noise Data Collection (April 2006) • Design Study (July-August 2006) • Public Meeting (August 2006) • Design (August – November 2006) • Additional Funds Required (April 2007) • Bidding (May 2007) • Construction (July 2007) West Northern Lights Blvd. Sound Barrier Improvements

18. Contact Information • Key Personnel • Rebecca Campbell, PE – CRW Project Engineer Phone 562-3252 e-mail rcampbell@crweng.com - Steve Gillette, PE – MOA Project Manager Phone 343-8173 • THANK YOU! West Northern Lights Blvd. Sound Barrier Improvements