EARTHQUAKE

Northern California Earthquake Hazards WorkshopFebruary 12, 2014

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)

Seismic Standards

DBE (Safety) LDBE (Operability)

BART System 500 year return or median plus ½ standard deviation, whichever is larger

Median

Transbay Tube 1,000 year return or median plus 1 standard deviation, whichever is larger

500 year return or median plus ½ standard deviation, whichever is larger

Original Program Scope

Current Program Scope

Status of Earthquake Safety Work

Other Contracts (Not Shown)

Daly City B206:Completed Construction

Lake Merritt Admin. Bldg. Dismantling:Completed Construction

34.5KV Electrical Upgrade:

Systems and Equipment (Transbay Tube):Completed Construction

4th Street Warehouse:Completed Construction

Systems and Equipment Supports:Completed Construction

In Construction

MIsc. Retrofits:Design

C O N T R AC O S T A

C O U N T Y

A L A M E D AC O U N T Y

S A NF R A N C I S C O

C O U N T Y

S A NM A T E O

C O U N T Y

16th St. MissionMUNI Church St. Sta.

EmbarcaderoMontgomery St.

Powell St.Civic Center

24th St. Mission

Lake Merritt

FruitvaleColiseum

San Leandro

Bay Fair

Glen ParkBalboa Park

Daly City

Daly City Yard

Castro Valley

Dublin/Pleasanton

Richmond

Richmond Yard

El Cerrito del Norte

El Cerrito Plaza

Concord

Concord Yard

Pleasant Hill

Walnut Creek

Rockridge

OrindaLafayette

N. Concord/Martinez

South Hayward

Hayward Yard

Oakland Shops

San Bruno

SFIA

Millbrae

Hayward

Union City

Fremont

Berkeley

North Berkeley

Ashby

MacArthur19th St. - Oakland

Oakland VentStructure

San FranciscoTransition Structure

West Oakland

South San Francisco

Colma

Pittsburg/Bay Point

BA RT EA RT H Q U A K E SA F ET Y P RO G RA MWO RK ST A T U S

Oakland CityCenter 12th St.

P

PPP

P

P

Status of Work in ProgressCompleted ConstructionCurrent ConstructionDesignNo Retrofits

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

EQ Damage Prediction

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.