Draft EIS/EIR Appendix L West Santa Ana Branch Transit Corridor Project Construction Methods Report
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Draft EIS/EIR Appendix L Final Construction Methods Report WEST SANTA ANA BRANCH TRANSIT CORRIDOR PROJECT Draft EIS/EIR Appendix L Final Construction Methods Report Prepared for: Los Angeles County Metropolitan Transportation Authority Prepared by: WSP USA, Inc. 444 South Flower Street Suite 800 Los Angeles, California 90071 June 2021 Authors AUTHORS Kristin Carlson, WSP Gina Escalante, WSP Alana Flaherty, WSP Spencer Jaeger, WSP Nathan Maack, WSP Luke Yang, WSP Table of Contents TABLE OF CONTENTS 1 INTRODUCTION............................................................................................................. 1-1 1.1 Study Background ................................................................................................ 1-1 1.2 Alternatives Evaluation, Screening and Selection Process .................................... 1-1 1.3 Report Purpose and Structure .............................................................................. 1-2 2 PROJECT DESCRIPTION ................................................................................................. 2-1 2.1 Geographic Sections............................................................................................. 2-5 2.1.1 Northern Section .................................................................................. 2-5 2.1.2 Southern Section .................................................................................. 2-6 2.2 No Build Alternative ............................................................................................. 2-6 2.3 Build Alternatives ................................................................................................. 2-9 2.3.1 Proposed Alignment Configuration for the Build Alternatives .............. 2-9 2.3.2 Alternative 1: Los Angeles Union Station to Pioneer Station .............. 2-12 2.3.3 Alternative 2: 7th Street/Metro Center to Pioneer Station................... 2-15 2.3.4 Alternative 3: Slauson/A (Blue) Line to Pioneer Station ...................... 2-15 2.3.5 Alternative 4: I-105/C (Green) Line to Pioneer Station ........................ 2-15 2.3.6 Design Options................................................................................... 2-16 2.3.7 Maintenance and Storage Facility ....................................................... 2-16 2.3.8 Bellflower MSF Option........................................................................ 2-16 2.3.9 Paramount MSF Option ..................................................................... 2-16 3 REGULATORY FRAMEWORK .......................................................................................... 3-1 3.1 Federal .................................................................................................................. 3-1 3.2 State ..................................................................................................................... 3-2 3.3 Local and Regional ............................................................................................... 3-2 4 CONSTRUCTION METHODS/AFFECTED ENVIRONMENT .......................................... 4-1 4.1 Construction Sequencing and Duration ............................................................... 4-1 4.2 Utility Relocation .................................................................................................. 4-9 4.3 Freight Relocation .............................................................................................. 4-16 4.4 At-Grade Construction Activities ........................................................................ 4-17 4.4.1 Guideway ............................................................................................ 4-17 4.4.2 Construction Methods within Rail ROW ............................................. 4-17 4.4.3 Construction Methods within City Streets .......................................... 4-17 4.4.4 Street Reconfiguration and Reconstruction ........................................ 4-18 4.4.5 Stations ............................................................................................... 4-18 4.4.6 Parking Facilities ................................................................................. 4-19 4.4.7 Maintenance and Storages Facility ..................................................... 4-19 4.5 Aerial Construction Activities ............................................................................. 4-20 4.5.1 Guideway ............................................................................................ 4-20 4.5.2 River Crossings ................................................................................... 4-22 4.5.3 Retained Fill Guideway ........................................................................ 4-22 4.5.4 Stations ............................................................................................... 4-23 4.5.5 Slauson/A Line Station ....................................................................... 4-24 4.6 Underground Construction Activities ................................................................. 4-24 4.6.1 Twin Bore Tunnel ................................................................................ 4-24 4.6.2 Cut-and-Cover Construction ............................................................... 4-25 4.6.3 Sequential Excavation Method ............................................................ 4-29 West Santa Ana Branch Transit Corridor Project Final Construction Methods Report June 2021 | i Table of Contents 4.7 Freeway Crossings .............................................................................................. 4-30 4.7.1 I-105 .................................................................................................... 4-31 4.8 Other Construction Activities .............................................................................. 4-33 4.8.1 Systems ............................................................................................... 4-33 4.8.2 Train Control House ............................................................................ 4-36 4.8.3 Overhead Catenary Systems ................................................................ 4-36 4.8.4 Temporary Street and Lane Closures................................................... 4-36 4.8.5 Staging Areas ...................................................................................... 4-52 4.8.6 Haul Routes ........................................................................................ 4-55 4.8.7 Excavated Materials ............................................................................. 4-55 5 REFERENCES ................................................................................................................... 5-1 Tables Table 2.1. No Build Alternative – Existing Transportation Network and Planned Improvements ................................................................................................................... 2-7 Table 2.2. Summary of Build Alternative Components ............................................................ 2-9 Table 4.1. General Sequence of Construction Activities and Equipment in the Northern and Southern Sections ...................................................................................................... 4-2 Table 4.2. Major Utility Conflicts ............................................................................................ 4-10 Table 4.3. Freight Relocation ................................................................................................. 4-16 Table 4.4. Proposed TPSS Locations (North to South) .......................................................... 4-33 Table 4.5. Construction Related Closures by Jurisdiction ....................................................... 4-38 Table 4.6. Staging Areas......................................................................................................... 4-53 Table 4.7. Excavation Calculations ......................................................................................... 4-55 West Santa Ana Branch Transit Corridor Project ii | June 2021 Final Construction Methods Report Table of Contents Figures Figure 2-1. Project Alternatives ................................................................................................ 2-2 Figure 2-2. Project Alignment by Alignment Type.................................................................... 2-4 Figure 2-3. Northern Section ................................................................................................... 2-5 Figure 2-4. Southern Section ................................................................................................... 2-6 Figure 2-5. Freeway Crossings ............................................................................................... 2-10 Figure 2-6. Existing Rail Right-of-Way Ownership and Relocation ......................................... 2-11 Figure 2-7. Maintenance and Storage Facility Options .......................................................... 2-17 Figure 4-1. Northern Section Project Configurations............................................................... 4-7 Figure 4-2. Southern Section Project Configurations ............................................................... 4-8 Figure 4-3. Typical Cross Section of an At-Grade Guideway with Embedded Track ............... 4-18 Figure 4-4. At-Grade LRT Station ........................................................................................... 4-19 Figure 4-5. Typical Cross Section of