Joint BARCfirst-BENS-BRMA Infrastructure Symposium June 25, 2009.

Joint BARCfirst-BENS-BRMAInfrastructure Symposium

June 25, 2009

Hayward Fault parallel to BART and crosses BART.

1868 last major rupture of Hayward Fault (130- to170-year return cycle).

Four earthquake scenarios most likely to damage BART:

7.0 Hayward Fault

8.0 San Andreas Fault

6.7 Concord Fault

6.7 Calaveras Fault

Bay Area Faults and BART

Retrofit Locations

3

Lafayette

Transbay Tube and Associated Structures

22 Miles of Aerial Guideways

19 BART Stations

4 Train Maintenance Yards

Parking, Operations and Administration Structures

Power, Mechanical, Train Control and Communications Equipment

1 BART-Owned SF Muni Facility

Aerial Guideway Vulnerability

Foundations too Small

Potential for Crumbling of Columns, Similar to Cypress Freeway

Total of 1,918 Aerial Guideway Supports

Strengthen Foundations

“Jacket” Columns (10-15%)

Add Shear Keys (10-15%)

Aerial GuidewayRetrofit Concepts

Life Safety Operability

Add Piles (WhereAppropriate)

Similar StationRetrofits

Engineering Earthquake

Response Team

SERA Analysis

Questions & Answers

BART is Committed toSafeguarding Bay Area

Transportation and Economic Well-Being

Community Relations Manager:Catherine Westphall 510-464-7595