1. Northern California Earthquake Hazards Workshop February 12, 2014

2. Program Objectives Render BART system earthquake safe under Design Basis Earthquake (DBE). In general, “safe” = “noncollapse”. To the maximum extent reasonable and prudent, retrofit portions of the system to operability under the Lower Design Basis Earthquake (LDBE). “Operability” = return to train operations within a short period of time (1 -2 weeks)

3. Seismic Standards DBE (Safety)LDBE (Operability) BART System500 year return or median plus ½ standard deviation, whichever is larger Median Transbay Tube1,000 year return or median plus 1 standard deviation, whichever is larger 500 year return or median plus ½ standard deviation, whichever is larger

4. Original Program Scope

5. Current Program Scope

6. Status of Earthquake Safety Work

7. Remaining Work Retrofit Fremont Line aerial structures between Lake Merritt and Coliseum Complete 10 stations (7 in construction now) Upgrade 4 aerial structure piers along Richmond Line Retrofit interior liner in Transbay Tube (3 areas) and upgrade pumping system Expected completion: Fremont Line 2018, Transbay Tube 2023

8. EQ Damage Prediction

9. Other Seismic Preparedness Efforts Earthquake Early Warning System: Provides advanced warning (15 sec to 1 min) of large earthquake ground motions approaching the BART system. –Primarily for warning of distant earthquakes. –Tied to BART train control system – slows trains to reduce derailment or other possible effects. Feasibility study for retrofit of Berkeley Hills Tunnel, which crosses the Hayward Fault.