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Westside Purple Line Extension Final Supplemental Environmental

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Westside Purple Line Extension Final Supplemental Environmental November 2017 Westside Purple Line Extension Final Supplemental Environmental Impact Statement and Section 4(f) Evaluation Appendix E: Noise Reports LOS ANGELES COUNTY METROPOLITAN TRANSPORTATION AUTHORITY WESTSIDE PURPLE LINE EXTENSION PROJECT, SECTION 2 ADVANCED PRELIMINARY ENGINEERING Contract No. PS‐4350‐2000 Section 2 Construction Noise and Vibration Evaluation – Revision 1 Prepared for: Prepared by: 777 South Figueroa Street, Suite 1100 Los Angeles, CA 90017 ATS Consulting 215 North Marengo Avenue Pasadena, CA 91101 May 24, 2017 Section 2 Construction Noise and Vibration Evaluation – Revision 1 Table of Contents Table of Contents PREFACE ........................................................................................................................................ P-1 1.0 INTRODUCTION ..................................................................................................................1-1 2.0 CONSTRUCTION ACTIVITIES .................................................................................................2-1 2.1 Wilshire/Rodeo ................................................................................................................ 2-1 2.2 Century City Constellation ............................................................................................... 2-2 3.0 PRE-CONSTRUCTION NOISE MEASUREMENTS ......................................................................3-1 4.0 CONSTRUCTION NOISE LIMITS .............................................................................................4-1 4.1 City of Los Angeles Noise Limits ....................................................................................... 4-1 4.2 City of Beverly Hills Noise Limits ...................................................................................... 4-1 4.3 Summary of Noise Limits ................................................................................................. 4-2 5.0 CONSTRUCTION VIBRATION LIMITS .....................................................................................5-1 5.1 Groundborne Noise ......................................................................................................... 5-2 6.0 CONSTRUCTION NOISE PREDICTIONS...................................................................................6-1 6.1 Noise Prediction Methodology ........................................................................................ 6-1 6.2 Noise Prediction Results and Impact Assessment ........................................................... 6-1 6.2.1 Wilshire/Rodeo Station ....................................................................................... 6-1 6.2.2 Century City Constellation Station ...................................................................... 6-3 6.2.3 California Rehabilitation Institute Facility .......................................................... 6-6 6.2.4 Haul Routes ......................................................................................................... 6-8 7.0 CONSTRUCTION VIBRATION PREDICTIONS ...........................................................................7-1 7.1 Prediction Methodology .................................................................................................. 7-1 7.2 Prediction Results and Impact Assessment ..................................................................... 7-2 7.2.1 Wilshire/Rodeo Station ....................................................................................... 7-3 7.2.2 Century City Constellation Station ...................................................................... 7-3 7.3 Tunnel Trains.................................................................................................................... 7-3 7.4 Sensitive Receivers ........................................................................................................... 7-3 8.0 GROUNDBORNE VIBRATION DURING TUNNELING ...............................................................8-1 8.1 Tunnel Boring Machines .................................................................................................. 8-1 9.0 MITIGATION .......................................................................................................................9-1 9.1 Wilshire/Rodeo Station .................................................................................................... 9-1 9.2 Century City Constellation Station ................................................................................... 9-1 9.3 Backup Alarms ................................................................................................................. 9-3 9.4 Haul Trucks ....................................................................................................................... 9-3 9.5 Tunnel from Wilshire/Rodeo and Century City Constellation Stations ........................... 9-3 9.6 Additional Mitigation Measures ...................................................................................... 9-4 9.7 General Noise and Vibration Control Measures .............................................................. 9-5 WESTSIDE PURPLE LINE EXTENSION PROJECT May 24, 2017 Page i Section 2 Construction Noise and Vibration Evaluation – Revision 1 Table of Contents 10.0 MONITORING ................................................................................................................... 10-1 10.1 Noise Monitoring ........................................................................................................... 10-1 10.1.1 Wilshire/Rodeo ................................................................................................. 10-1 10.1.2 Century City Constellation ................................................................................ 10-2 10.2 Vibration Monitoring ..................................................................................................... 10-3 List of Figures Figure 1-1: Project Sections ............................................................................................................... 1-1 Figure 2-1: Lay down and Staging Areas at Wilshire/Rodeo Station ................................................. 2-2 Figure 2-2: Lay down and Staging Areas at Century City Constellation Station ................................ 2-3 Figure 2-3: Wilshire/Rodeo Station Construction Sites and Noise Receivers .................................... 2-4 Figure 2-4: Century City Constellation Station Construction Sites and Noise Receivers ................... 2-5 Figure 6-1: Noise Measurement Site ................................................................................................. 6-7 Figure 6-2: California Rehabilitation Institute Facility Measured Noise Levels ................................. 6-7 Figure 6-3: Proposed Construction Truck Haul Routes .................................................................... 6-10 Figure 9-1: 2040 CPE and 1940-1950 CPE Construction Site Noise Barrier Walls ............................. 9-2 Figure 9-2: Nighttime Noise Level Contours at California Rehabilitation Institute Facility ............... 9-2 Figure 9-3: Representative Moveable Noise Barrier Design .............................................................. 9-4 List of Tables Table 3-1: Pre-Construction Noise Measurement Results Wilshire/Rodeo Station ......................... 3-2 Table 3-2: Pre-Construction Noise Measurement Results Century City Constellation Station ........ 3-2 Table 4-1: Summary of Construction Noise Limits ........................................................................... 4-2 Table 5-1: Construction Vibration Damage Risk Thresholds ............................................................ 5-1 Table 5-2: Properties Listed and Eligible as NRHP ............................................................................ 5-1 Table 5-3: Allowable Maximum Interior Groundborne Noise from Underground Construction Activities (Lmax) ............................................................................................................... 5-2 Table 6-1: Construction Equipment Noise Emission Levels .............................................................. 6-2 Table 6-2: Wilshire/Rodeo Nighttime Construction Noise – Leq (dBA) ............................................ 6-3 Table 6-3: Century City Constellation Nighttime Construction Noise – Leq (dBA) ........................... 6-5 Table 6-4: Nighttime (3:00 A.M. to 4:00 A.M.) Construction Noise Impact Thresholds at the Rehabilitation Facility ...................................................................................................... 6-8 Table 6-5: Estimated Daily Haul Truck Trips ..................................................................................... 6-9 Table 7-1: Equipment Vibration Emission Levels .............................................................................. 7-2 Table 7-2: Distance to Construction Vibration Impact Thresholds ................................................... 7-3 WESTSIDE PURPLE LINE EXTENSION PROJECT May 24, 2017 Page ii Section 2 Construction Noise and Vibration Evaluation – Revision 1 Table of Contents List of Appendices APPENDIX A FUNDAMENTALS OF NOISE AND VIBRATION ........................................................... A-1 APPENDIX B NOISE MEASUREMENT RESULTS ............................................................................. B-1 WESTSIDE PURPLE LINE EXTENSION PROJECT May 24, 2017 Page iii Section 2 Construction Noise and Vibration
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