LOS ANGELES COUNTY METROPOLITAN TRANSPORTATION AUTHORITY WESTSIDE PURPLE LINE EXTENSION PROJECT, SECTION 3 ADVANCED PRELIMINARY ENGINEERING Contract No. PS-4350-2000 Construction and Operation Noise and Vibration Assessment for Section 3 Project Refinements Task No. 62.04.010.03.06E Prepared for: Prepared by: 777 South Figueroa Street, Suite 1100 Los Angeles, CA 90017 December 2018 Construction and Operation Noise and Vibration Assessment for Section 3 Project Refinements Table of Contents Table of Contents 1.0 INTRODUCTION ....................................................................................................................... 1-1 1.1 Project Overview ......................................................................................................... 1-1 1.2 Purpose of Technical Memorandum ............................................................................ 1-4 2.0 PROJECT REFINEMENTS ........................................................................................................... 2-1 2.1 Construction Staging Areas .......................................................................................... 2-2 2.1.1 Western VA Construction Staging Area ........................................................... 2-5 2.1.2 Lot 42 Construction Staging Area .................................................................... 2-7 2.1.3 Construction Staging and Work Areas in Caltrans Infiltration Basins ................ 2-7 2.1.4 Construction Staging Area Located West of Bonsall Avenue ............................ 2-7 2.1.5 Replacement Parking Structure ....................................................................... 2-7 2.2 Alignment at VA Medical Center and Westwood/VA Hospital Station Entrances .......... 2-8 2.3 Westwood/VA Hospital Station Access ...................................................................... 2-12 2.4 Murals ....................................................................................................................... 2-15 2.5 Construction Method for Westwood/VA Hospital Station West Crossover ................. 2-18 2.6 Westwood/UCLA Station Entrances ........................................................................... 2-20 2.7 Tunnel Size ................................................................................................................ 2-23 2.8 Grouting .................................................................................................................... 2-23 2.9 Underground Conduits .............................................................................................. 2-26 3.0 DESCRIPTION OF CONSTRUCTION ACTIVITIES ......................................................................... 3-1 3.1 Tunnel Boring Machines/Tunnel Construction ............................................................. 3-1 3.2 Stations and Crossovers ............................................................................................... 3-1 3.3 Laydown and Staging Construction Areas .................................................................... 3-2 3.3.1 Westwood/UCLA Station................................................................................. 3-2 3.3.2 Westwood/VA Hospital Station ....................................................................... 3-3 3.3.3 Western VA Construction Staging Area — Tunneling Operations ..................... 3-5 3.4 Construction Activities................................................................................................. 3-6 3.4.1 Westwood/UCLA Station Site .......................................................................... 3-6 3.4.2 Westwood/VA Hospital Station Site ................................................................ 3-6 3.4.3 Western VA Construction Staging Area ........................................................... 3-7 4.0 PREDICTION METHODOLOGY .................................................................................................. 4-1 4.1 Construction Noise ...................................................................................................... 4-1 4.2 Vibration Prediction Methodology ............................................................................... 4-2 4.2.1 Surface Construction Activities........................................................................ 4-2 4.2.2 Train Groundborne Vibration and Groundborne Noise .................................... 4-3 4.2.3 Prediction Methodology TBM and Muck Train Activities GBV and GBN ........... 4-5 WESTSIDE PURPLE LINE EXTENSION PROJECT December 2018 Page i Construction and Operation Noise and Vibration Assessment for Section 3 Project Refinements Table of Contents 4.2.4 Groundborne Noise ........................................................................................ 4-7 5.0 NOISE AND VIBRATION LIMITS ................................................................................................ 5-1 5.1 FTA Train Groundborne Vibration Criteria ................................................................... 5-1 5.2 FTA Construction Groundborne Vibration Criteria ....................................................... 5-1 5.2.1 Vibration Limits for Historic Resources ............................................................ 5-2 5.2.2 Metro Groundborne Vibration and Groundborne Noise Criteria...................... 5-3 5.3 Construction Noise Limits ............................................................................................ 5-4 5.3.1 City of Los Angeles Construction Noise Limits.................................................. 5-4 5.3.2 County of Los Angeles Construction Noise Limits ............................................ 5-5 5.3.3 Summary of Construction Noise Limits ............................................................ 5-6 6.0 EXISTING AMBIENT NOISE ....................................................................................................... 6-1 6.1 Westwood/VA Hospital Station and VA Lot 43 ............................................................. 6-1 6.2 Western VA Construction Staging Area ........................................................................ 6-3 6.3 UCLA Lot 36 Staging Area ............................................................................................ 6-4 7.0 VIBRATION AND NOISE ASSESSMENT...................................................................................... 7-1 7.1 Assessment of Vibration and Noise Effects on Contributing and Non- Contributing Resources Associated with West Los Angeles Veterans Affairs Historic District ............................................................................................................ 7-3 7.1.1 Construction Groundborne Vibration .............................................................. 7-4 7.1.2 Construction Noise ....................................................................................... 7-15 7.1.3 Linde (Westwood) Medical Plaza................................................................... 7-24 7.1.4 Train Vibration and Groundborne Noise Assessment .................................... 7-25 7.2 Assessment of other Noise- and Vibration-Sensitive Receivers .................................. 7-27 7.2.1 Construction Noise ....................................................................................... 7-27 7.2.2 Construction Groundborne Vibration ............................................................ 7-35 7.2.3 Alignment at VA Medical Center and Westwood/VA Hospital Station Entrances ...................................................................................................... 7-38 7.2.4 Murals .......................................................................................................... 7-39 7.2.5 Construction Method for Westwood/VA Hospital Station West Crossover ...................................................................................................... 7-39 7.2.6 (Westwood) Federal Building ........................................................................ 7-40 7.2.7 Westwood/UCLA Station Entrances .............................................................. 7-41 7.2.8 Predicted GBV and GBN for Tunneling Activities............................................ 7-43 7.2.9 Westwood/UCLA Station Construction .......................................................... 7-46 7.2.10 Train Vibration and Groundborne Noise Assessment at Linde Medical Plaza ............................................................................................................. 7-48 7.3 Tunnel Size ................................................................................................................ 7-49 7.4 Grouting .................................................................................................................... 7-49 7.5 Underground Conduit................................................................................................ 7-50 WESTSIDE PURPLE LINE EXTENSION PROJECT Page ii December 2018 Construction and Operation Noise and Vibration Assessment for Section 3 Project Refinements Table of Contents 8.0 MITIGATION MEASURES.......................................................................................................... 8-1 8.1 Surface Construction Noise Mitigation......................................................................... 8-1 8.2 Construction-related Vibration Mitigation ................................................................... 8-6 8.3 TBM Mitigation ..........................................................................................................