1. Presentation to Coachella’s City Council October 8, 2014
Technical Background Report to the Safety Element of the General Plan
Presentation to Coachella’s City Council
October 8, 2014

2. SAFETY ELEMENT Mandatory component of the General Plan
Discusses natural and man-made hazards
Provides mitigation actions
Discusses disaster preparedness, response and recovery

3. Report SECTIONS Chapter 1: Seismic Hazards Chapter 2: Geologic Hazards
Chapter 3: Flood Hazards
Chapter 4: Fire Hazards
Chapter 5: Hazardous Materials Management
Chapter 6: Severe Weather Hazards
Chapter 7: Disaster Preparedness, Response and Recovery
Appendix A: References
Appendix B: Glossary

4. Chapter 1: Seismic hazards
Regulatory framework
Notable Historic Earthquakes
Seismic Shaking
Emphasis on the ShakeOut Scenario
Fault Rupture
Liquefaction
Earthquake-Induced Landslides

5. Faults and historical seismicity

6. Liquefaction and slope instability

7. Hazus earthquake scenarios
Software created for FEMA; runs on ArcGIS platform; analyses conducted by a certified HazUS Trained Professional
Estimates losses resulting from earthquakes, floods and hurricanes
Uses Census data; user-modified to better represent conditions
M7.8, Southern San Andreas fault
M7.1, Coachella segment of San Andreas fault

9. Hazus results M7.8 ShakeOut Scenario M7.1 Coachella Segment Scenario
Building-Related Economic Losses
>$880 million
>$260 million
Building Damage
3,700 moderately;
500 extensively;
3,000 completely
980 moderately;
1,300 extensively;
260 completely
Injuries
Fatalities
10-27
52-62
1-2
Damage to Utilities
Severe; no water or electric power for > 3 months
Minor; 1000’s of households with no water for 1 week
Damage to Critical Facilities
Extensive damage to schools and hospitals
Moderate damage to schools and hospitals

10. Chapter 2: GEOLOGIC hazards
Landslides and unstable slopes
Compressible, collapsible, expansive and corrosive soils
Ground subsidence
Erosion and wind-blown sand

11. Chapter 3: Flood hazards

12. Seismically induced inundation

13. 500-year flood on Whitewater River
Hazus loss scenario
500-year flood on Whitewater River
Building-Related Losses
>$187 Million
Buildings
>280 extensively damaged
>2,200 slightly to moderately damaged
Critical Facilities
Many moderately damaged; none will be substantially damaged

14. Chapter 4: Fire Hazards Vegetation fires Structure fires
Chemical Fires
Fires after an Earthquake
Fire Suppression Services
Chapter completed with significant input from the Riverside County Fire Department and Battalion Chief De La Cruz

15. High fire hazard areas

16. Chapter 5: Hazardous materials management
Superfund, Cortese, Toxic Release Inventory, EPA-registered Generators
Leaking Underground Storage Tank Sites
Drinking Water Quality
Household Hazardous Waste & Recycling
Releases due to Transportation Accidents
Earthquake-Induced Releases

17. Hazardous materials sites

18. Chapter 6: Severe weather
High Winds
Hail
Temperature Extremes
Drought

19. Chapter 7: Disaster preparedness
Risk Analysis
Impact to Critical Facilities
Potential Evacuation Routes
Potential Shelter Locations

20. Potential Emergency Shelters and Evacuation Routes

21. THANK YOU! ANY QUESTIONS? Tania González
Vice-President, Sr. Consultant
Earth Consultants International, Inc.