NoiseDisciplineReport– Final US395NorthSpokaneCorridorProject WSDOT—Environmental Services—Air, Noise, Energy September 16, 2019 This page intentionally blank US 395 North Spokane Corridor Project I-90 to US 395 MP 158.51 I-90 MP 282.37 to 285.59 Noise Discipline Report – Final September 16, 2019 Prepared by: WSP USA 999 Third Avenue, Suite 3200 Seattle, WA 98104 Reviewed by: Jim Laughlin Washington State Department of Transportation Air, Noise, and Energy Program 15700 Dayton Ave. North PO Box 330310 Seattle, WA 98133-9710 This page intentionally blank TABLE OF CONTENTS Table of Contents EXECUTIVE SUMMARY ...................................................................................................................... 1 Project Objectives ................................................................................................................. 1 Current Noise Environment ................................................................................................... 2 Noise Impacts Considering the New Alignment ..................................................................... 2 Abatement Recommended.................................................................................................... 3 Project Construction and Future Planning ............................................................................. 3 INTRODUCTION ................................................................................................................................ 4 Project Description and Purpose............................................................................................ 4 Type 1 Trigger for Noise Analysis .......................................................................................... 4 Noise Relevant Project Information ....................................................................................... 5 CHARACTERISTICS OF SOUND AND NOISE ........................................................................................ 8 Definition of Sound ............................................................................................................... 8 Definition of Noise ................................................................................................................ 8 Traffic Noise Sources ............................................................................................................. 8 Sound Propagation ............................................................................................................... 9 Line and Point Sources ........................................................................................................ 10 Effects of Noise ................................................................................................................... 10 Noise Level Descriptors ....................................................................................................... 10 Noise Regulations and Impact Criteria ................................................................................ 11 TRAFFIC NOISE ANALYSIS METHODOLOGY ..................................................................................... 14 Determination of the Traffic Noise Study Area .................................................................... 14 Traffic Noise Measurement ................................................................................................. 15 Traffic Noise Model Validation ............................................................................................ 16 TRAFFIC NOISE LEVELS .................................................................................................................... 27 Description of Study Area.................................................................................................... 27 Operational Traffic Noise .................................................................................................... 27 TRAFFIC NOISE ABATEMENT ........................................................................................................... 53 Traffic Noise Abatement—Background ............................................................................... 53 Feasibility ........................................................................................................................... 53 Reasonableness of Noise Barriers........................................................................................ 69 Traffic Noise Abatement Summary...................................................................................... 87 CONSTRUCTION NOISE ................................................................................................................... 88 Construction Noise Background .......................................................................................... 88 Construction Noise Level Limits ........................................................................................... 89 Construction Noise Assessment ........................................................................................... 90 Construction Noise Variance for Night Work ....................................................................... 90 Construction Noise Abatement............................................................................................ 90 REFERENCES ................................................................................................................................... 92 APPENDIX A—TRAFFIC NOISE ANALYSIS AND ABATEMENT PROCESS ............................................ 94 When are noise reports and/or recommendations final? ..................................................... 94 Environmental Discipline Reports ........................................................................................ 94 Design Phase ...................................................................................................................... 94 Public Involvement.............................................................................................................. 94 Final Steps .......................................................................................................................... 95 APPENDIX B—PERMITTED FUTURE LAND USE ................................................................................ 96 US 395 North Spokane Corridor Project Page i Noise Discipline Report – Final September 16, 2019 TABLE OF CONTENTS APPENDIX C—TRAFFIC DATA .......................................................................................................... 98 APPENDIX D—MODELING SITE DESCRIPTIONS ............................................................................. 103 APPENDIX E—TNM BARRIER GRAPHICS ........................................................................................ 107 APPENDIX F—TNM DATA .............................................................................................................. 117 APPENDIX G—FIELD DATA SHEETS................................................................................................ 121 Exhibits Exhibit 1: Project Vicinity Map ........................................................................................................... 6 Exhibit 2: Typical Noise Levels............................................................................................................ 9 Exhibit 3: FHWA Noise Abatement Criteria by Land Use ................................................................... 12 Exhibit 4: Existing Land Use in Project Vicinity.................................................................................. 15 Exhibit 5: Existing Noise Measurement Data and Noise Model Validation Results ............................ 17 Exhibit 6: Traffic Noise Measurement and Modeling Locations – Project Area West Terminus at I-90/SR 290 .................................................................................................................. 18 Exhibit 7: Traffic Noise Measurement and Modeling Locations – Project Area West ........................ 19 Exhibit 8: Traffic Noise Measurement and Modeling Locations – Project Area West-Central ............ 20 Exhibit 9: Traffic Noise Measurement and Modeling Locations – Project Area Central ..................... 21 Exhibit 10: Traffic Noise Measurement and Modeling Locations – Project Area Central-East ............ 22 Exhibit 11: Traffic Noise Measurement and Modeling Locations – Project Area East ........................ 23 Exhibit 12: Traffic Noise Measurement and Modeling Locations – Project Area East Terminus at I-90/Sprague Avenue ................................................................................................... 24 Exhibit 13: Traffic Noise Measurement and Modeling Locations – Project Area North Terminus at Future US 395/E. Mission Avenue ................................................................. 25 Exhibit 14: Modeled Noise Levels .................................................................................................... 29 Exhibit 15: Modeled 2040 Build Noise Abatement Criteria Impacts – Project Area West Terminus at I-90/SR 290................................................................................................... 45 Exhibit 16: Modeled 2040 Build Noise Abatement Criteria Impacts – Project Area West .................. 46 Exhibit 17: Modeled 2040 Build Noise Abatement Criteria Impacts – Project Area West- Central ............................................................................................................................