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City of South Pasadena Local Hazard Mitigation Plan

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City of South Pasadena Local Hazard Mitigation Plan City of South Pasadena DRAFT Local Hazard Mitigation Plan July 2018 DRAFT Local Hazard Mitigation Plan Prepared by P.O. Box 66487 Scotts Valley, CA 95066 (831) 438-3290 repattersonandassociates.com This Page Intentionally Left Blank INSERT COPY OF COUNCIL RESOLUTION IN FINAL DOCUMENT This Page Intentionally Left Blank Acknowledgements Technical Advisory Committee Public Advisory Committee City of South Pasadena Robert Bartl Ellen Daigle Acting Captain Chair Police Department Public Safety Commission Luis Reinoso Eric Zanteson Vice Chair Battalion Chief Public Safety Commission Fire Department Vernon Rene Daley Joe Johnson Commissioner Corporal Public Safety Commission Police Department Jeremy Ding Commissioner Karen Aceves Public Safety Commission Management Analyst City Manager’s Office Greg Hall Commissioner Thomas Amare Public Safety Commission Civil Engineering Assistant Public Works Department Grace Kung Commissioner (PTA Representative) Jennifer Mendez Public Safety Commission Management Assistant Finance Department John Penido Area C Representative Los Angeles County OEM Consulting Team R.E. Patterson and Associates Russ Patterson, Project Manager Eric Aasen, Project Analyst Loreen Fornshell, Project Editor This Page Intentionally Left Blank City of South Pasadena Table of Contents Table of Contents Chapter One – Introduction ............................................................................................................... 1 1.1 Purpose of the Plan .......................................................................................................................... 1 1.2 Authority ........................................................................................................................................... 2 1.3 Plan Adoption.................................................................................................................................... 2 1.4 Plan Use ............................................................................................................................................ 2 1.5 Mitigation Priorities and Goals ......................................................................................................... 2 1.6 Hazard Mitigation Planning Process ................................................................................................. 3 1.7 Public Review Draft ........................................................................................................................... 5 Chapter Two – Community Profile ..................................................................................................... 7 2.1 Physical Setting ................................................................................................................................. 7 2.2 History ............................................................................................................................................... 7 2.3 Community Profile ............................................................................................................................ 8 2.4 Economic Trends ............................................................................................................................. 11 2.5 Existing Land Use ............................................................................................................................ 11 2.6 Development Trends ....................................................................................................................... 15 2.7 Future Development ....................................................................................................................... 16 2.8 Critical Facilities .............................................................................................................................. 18 Chapter Three – Hazards Assessment .............................................................................................. 23 3.1 Hazard Identification and Prioritization .......................................................................................... 23 3.2 Climate Change Considerations ...................................................................................................... 27 3.3 Vulnerability/Risk Assessment Methodology ................................................................................. 27 3.4 Hazard Profiles ................................................................................................................................ 28 3.4.1 Geologic Hazards (Earthquake and Liquefaction) ................................................................... 28 3.4.2 Flooding ................................................................................................................................... 51 3.4.3 Landslide & Mudflow ............................................................................................................... 54 3.4.4 Wildfire .................................................................................................................................... 56 3.4.5 Hazardous Materials and Human Caused Events .................................................................... 60 3.4.6 Windstorm ............................................................................................................................... 62 3.4.7 Drought and Water Resources ................................................................................................ 65 3.4.8 Reservoir Failure ...................................................................................................................... 71 3.5 Summary of Vulnerability ............................................................................................................... 72 3.5.1 Significant Hazards ................................................................................................................... 72 3.5.2 Facilities at Most Risk .............................................................................................................. 77 3.5.3 Potential Losses ....................................................................................................................... 77 Local Hazard Mitigation Plan i City of South Pasadena Table of Contents Chapter Four – Mitigation Actions ................................................................................................... 79 4.1 Hazard Mitigation Overview ........................................................................................................... 79 4.2 Hazard Mitigation Actions .............................................................................................................. 81 4.3 Capabilities Assessment .................................................................................................................. 89 Chapter Five - Plan Maintenance Process......................................................................................... 99 5.1 Monitoring, Evaluating and Updating the Plan ............................................................................... 99 5.2 Method and Schedule for Updating the Plan within 5 Years ........................................................ 100 5.3 Adoption ....................................................................................................................................... 100 5.4 Implementation through Existing Programs ................................................................................. 100 5.5 Incorporation into Existing Planning Mechanisms ....................................................................... 101 5.6 Continued Public Involvement ...................................................................................................... 101 5.7 Point of Contact ............................................................................................................................ 101 List of Exhibits Exhibit 1 – Regional Vicinity Map ................................................................................................................ 9 Exhibit 2 – Land Use Map .......................................................................................................................... 13 Exhibit 3 – Map of Critical Facility Locations ......................................................................................................... 21 Exhibit 4 – Southern California Active Fault Zones ..................................................................................... 35 Exhibit 5 – Regional Earthquake Faults and Probabilities ......................................................................... 37 Exhibit 6 – Raymond Fault Map ................................................................................................................. 39 Exhibit 7 – Local Liquefaction Map .............................................................................................................. 41 Exhibit 8 – Local Landslide Map ................................................................................................................. 43 Exhibit 9 – USGS Earthquake Shake Map – Southern San Andreas Fault .................................................. 48 Exhibit 10 – USGS Earthquake Shake Map – Verdugo Fault ...................................................................... 49 Exhibit 11 – USGS Earthquake Shake Map – Raymond Fault ....................................................................... 50 Exhibit 12 – Map of Wildland - Urban Interface .......................................................................................
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