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Geotechnical and Hazardous Materials Technical Report

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Geotechnical and Hazardous Materials Technical Report WESTSIDE SUBWAY EXTENSION Geotechnical and Hazardous Materials Technical Report August 2010 This page intentionally left blank. Geotechnical and Hazardous Materials Technical Report Table of Contents Table of Contents 1.0 INTRODUCTION0B .......................................................................................................... 1-1 1.1 Purpose........................................................................................................................6B .... 1-1 1.2 Scope7B ............................................................................................................................... 1-1 1.3 Standards8B of Methodology ............................................................................................. 1-1 1.3.1 Methodology36B Overview ...................................................................................... 1-1 1.3.2 ASTM37B Standard ................................................................................................. 1-2 2.0 PROJECT1B DESCRIPTION.............................................................................................. 2-1 2.1 No9B Build Alternative ....................................................................................................... 2-1 2.2 TSM10B Alternative .............................................................................................................. 2-1 2.3 Build11B Alternatives ........................................................................................................... 2-1 2.3.1 Alternative38B 1—Westwood/UCLA Extension .................................................... 2-2 2.3.2 Alternative39B 2—Westwood/Veterans Administration (VA) Hospital Extension ............................................................................................................................ 2-2 2.3.3 Alternative40B 3—Santa Monica Extension .......................................................... 2-2 2.3.4 Alternative41B 4—Westwood/VA Hospital Extension plus West Hollywood Extension ............................................................................................................ 2-4 2.3.5 Alternative42B 5—Santa Monica Extension plus West Hollywood Extension .... 2-4 2.3.6 Stations43B and Segment Options ......................................................................... 2-5 2.3.7 Option44B 1—Wilshire/Crenshaw Station Option ............................................... 2-1 2.3.8 Option45B 2—Wilshire/Fairfax Station East Option ............................................ 2-1 2.3.9 Option46B 3—Wilshire/La Cienega Station Option ............................................. 2-2 2.3.10 Option47B 4—Century City Station and Segment Options .................................. 2-2 2.3.11 Option48B 5—Westwood/UCLA Station Options ................................................. 2-3 2.3.12 Option49B 6—Westwood/VA Hospital Station Option ........................................ 2-4 2.4 Base12B Stations ................................................................................................................... 2-4 2.5 Other13B Components of the Build Alternatives ............................................................... 2-5 2.5.1 Traction50B Power Substations .............................................................................. 2-5 2.5.2 Emergency51B Generators ...................................................................................... 2-5 2.5.3 Mid-Tunnel52B Vent Shaft ..................................................................................... 2-6 2.5.4 Trackwork53B Options ............................................................................................ 2-6 2.5.5 Rail54B Operations Center ...................................................................................... 2-8 2.5.6 Maintenance55B Yards ............................................................................................ 2-9 2.6 Minimum14B Operable Segments ...................................................................................... 2-9 2.6.1 MOS56B 1—Fairfax Extension ............................................................................. 2-10 2.6.2 MOS57B 2—Century City Extension .................................................................... 2-10 3.0 AFFECTED2B ENVIRONMENT ........................................................................................ 3-1 3.1 Topography15B ..................................................................................................................... 3-1 3.2 Geology16B ............................................................................................................................ 3-1 3.2.1 Regional58B Geologic Setting ................................................................................. 3-1 3.2.2 Study59B Area Geology ........................................................................................... 3-4 3.2.3 Groundwater60B Conditions .................................................................................. 3-7 3.2.4 Faulting61B and Seismicity ................................................................................... 3-12 3.2.5 Gassy62B Ground Conditions ............................................................................... 3-18 WESTSIDE SUBWAY EXTENSION August 24, 2010 Page i Geotechnical and Hazardous Materials Technical Report Table of Contents 3.2.6 Geologic63B and Seismic Hazards ....................................................................... 3-25 3.3 Hazardous17B Materials .................................................................................................... 3-32 3.3.1 History64B of Past Uses ........................................................................................ 3-32 3.3.2 Oil65B Wells ........................................................................................................... 3-32 3.4 Government18B Agency Database List Search ................................................................. 3-40 3.4.1 Alternative66B 1 ..................................................................................................... 3-42 3.4.2 Alternative67B 2 ..................................................................................................... 3-59 3.4.3 Alternative68B 3 ..................................................................................................... 3-59 3.4.4 Alternative69B 4 ..................................................................................................... 3-68 3.4.5 Alternative70B 5 ..................................................................................................... 3-81 3.4.6 MOS71B 1............................................................................................................... 3-81 3.4.7 MOS72B 2............................................................................................................... 3-81 3.4.8 Union73B Pacific Los Angeles Transportation Center Rail Yard ....................... 3-81 3.4.9 Expanded74B Division 20 Yard ............................................................................. 3-83 3.4.10 Turnback75B Facility ............................................................................................. 3-84 3.5 Project19B Reconnaissance ................................................................................................ 3-85 3.5.1 Geologic76B Reconnaissance ................................................................................ 3-85 3.6 Hazardous20B Substances Reconnaissance ..................................................................... 3-86 3.6.1 Alternative77B 1 ..................................................................................................... 3-87 3.6.2 Alternative78B 2 ..................................................................................................... 3-88 3.6.3 Alternative79B 3 ..................................................................................................... 3-89 3.6.4 Alternatives80B 4 and 5 ......................................................................................... 3-90 3.6.5 Subway81B Station Locations ............................................................................... 3-90 3.6.6 Expanded82B Division 20 Yard and Turnback Facility ....................................... 3-90 3.6.7 Union83B Pacific Los Angeles Transportation Center Rail Yard ....................... 3-92 4.0 ENVIRONMENTAL3B IMPACTS/ENVIRONMENTAL CONSEQUENCES ...................... 4-1 4.1 Methodology21B ................................................................................................................... 4-1 4.1.1 Impact84B Evaluation Methodology ....................................................................... 4-1 4.2 No22B Build Alternative ....................................................................................................... 4-1 4.3 Transportation23B System Management (TSM) Alternative ............................................. 4-1 4.4 Alternative24B 1 .................................................................................................................... 4-2 4.4.1 Surface85B Fault Rupture ....................................................................................... 4-2 4.4.2 Seismic86B Ground Shaking .................................................................................. 4-2 4.4.3 Differential87B Seismic Settlement.......................................................................
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