GENERAL PLAN SAFETY TECHNICAL REPORT SAN BERNARDINO COUNTY Appendix San Bernardino Countywide Plan Safety Background Report REPORT USE, INTENT, AND LIMITATIONS This Background Report was prepared to inform the preparation of the Countywide Plan. This report is not intended to be continuously updated and may contain out-of-date material and information. This report reflects data collected in 2016 and early 2017 as part of due diligence and issue identification. This report is not intended to be comprehensive and does not address all issues that were or could have been considered and discussed during the preparation of the Countywide Plan. Additionally, many other materials (reports, data, etc.) were used in the preparation of the Countywide Plan. This report is not intended to be a compendium of all reference materials. This report may be used to understand some of the issues considered and discussed during the preparation of the Countywide Plan, but should not be used as the sole reference for data or as confirmation of intended or desired policy direction. Final policy direction was subject to change based on additional input from the general public, stakeholders, and decision makers during regional outreach meetings, public review of the environmental impact report, and public adoption hearings. Data and analysis as of November 2016 Updated with outreach summary in November 2018 Prepared by: PlaceWorks In CollaborationDRAFT with Dudek on Fire Hazards May 2016 PlaceWorks DRAFT COUNTYWIDE PLAN SAFETY BACKGROUND REPORT SAN BERNARDINO COUNTY Table of Contents Table of Contents 1. PUBLIC SAFETY CONTEXT ....................................................................................................................... 1-1 INTRODUCTION ........................................................................................................................... 1-1 PURPOSE AND ORGANIZATION OF REPORT ................................................................ 1-2 SUMMARY OF PUBLIC OUTREACH ...................................................................................... 1-3 REPORT FINDINGS ...................................................................................................................... 1-5 1.4.1 Seismic and Geologic Hazards ......................................................................................... 1-5 1.4.2 Flood Hazards ..................................................................................................................... 1-6 1.4.3 Hazardous Materials ........................................................................................................... 1-7 1.4.4 Fire Hazards ......................................................................................................................... 1-8 1.4.5 Emergency Preparedness ................................................................................................... 1-9 ADDITIONAL ISSUES TO EXPLORE .................................................................................. 1-10 2. SEISMIC AND GEOLOGIC HAZARDS ........................................................................................................ 2-1 INTRODUCTION ........................................................................................................................... 2-1 2.1.1 Regulatory Setting ............................................................................................................... 2-2 2.1.2 Important Terms ................................................................................................................. 2-7 2.1.3 Geologic Setting ................................................................................................................ 2-10 2.1.4 Recent Geologic and Seismic Events ............................................................................ 2-11 SEISMIC AND GEOLOGIC HAZARDS ................................................................................ 2-13 2.2.1 Ground Shaking ................................................................................................................ 2-13 2.2.2 Later Quaternary Surface Fault Rupture ....................................................................... 2-14 2.2.3 Liquefaction ....................................................................................................................... 2-19 2.2.4 Landslides & Slope Instability ......................................................................................... 2-20 2.2.5 Corrosive Soils ................................................................................................................... 2-23 2.2.6 Settlement/Subsidence..................................................................................................... 2-24 2.2.7 Expansive and Collapsible Soil ....................................................................................... 2-27 2.2.8 Hazardous Minerals .......................................................................................................... 2-28 IMPLEMENTING AGENCIES ................................................................................................. 2-29 3. FLOODING HAZARDS ................................................................................................................................ 3-1 INTRODUCTION ........................................................................................................................... 3-1 3.1.1 Regulatory Setting ............................................................................................................... 3-2 3.1.2 Important Terms ................................................................................................................. 3-6 3.1.3 Recent Flooding Events ..................................................................................................... 3-9 3.1.4 Hydrologic Setting ............................................................................................................ 3-11 3.1.5 Assets At Risk From Flooding ....................................................................................... 3-12 FLOODING HAZARDS ............................................................................................................. 3-15 3.2.1 Dam Inundation ................................................................................................................ 3-15 3.2.2 Levee Inundation .............................................................................................................. 3-18 3.2.3 Riverine Flooding .............................................................................................................. 3-29 3.2.4 Urban Flooding ................................................................................................................. 3-33 3.2.5 Alluvial Fans ...................................................................................................................... 3-35 DRAFT3.2.6 Debris and Mud Flows ..................................................................................................... 3-36 Data and analysis as of November 2016, with outreach summary added November 2018 PlaceWorks | Page i COUNTYWIDE PLAN SAFETY BACKGROUND REPORT SAN BERNARDINO COUNTY Table of Contents IMPLEMENTING AGENCIES ................................................................................................. 3-39 4. HAZARDOUS MATERIALS ......................................................................................................................... 4-1 INTRODUCTION ........................................................................................................................... 4-1 4.1.1 Regulatory Setting ............................................................................................................... 4-2 4.1.2 Important Terms ................................................................................................................. 4-7 4.1.3 Recent Hazardous Materials Incidents ............................................................................ 4-9 POTENTIAL HAZARDS ............................................................................................................ 4-11 4.2.1 Toxic Chemical Releases .................................................................................................. 4-12 4.2.2 Superfund National Priority List .................................................................................... 4-13 4.2.3 Formerly Used Defense Sites .......................................................................................... 4-14 4.2.4 GroundWater Contamination ......................................................................................... 4-15 4.2.5 Radioactive Waste ............................................................................................................. 4-17 4.2.6 Hazardous Material Transport ........................................................................................ 4-18 4.2.7 Solid Waste Disposition ................................................................................................... 4-22 IMPLEMENTING AGENCIES ................................................................................................. 4-27 5. FIRE HAZARDS ........................................................................................................................................... 5-1 INTRODUCTION ..........................................................................................................................