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Seismic Improvement Program. Presented to: The Northern California Earthquake Hazards Workshop February 12, 2014. Water Treatment and Distribution. 1,300,000 customers 331 square-mile area ~ 4,000 miles of pipe ~ 135 pumping plants ~ 180 reservoirs/tanks ~ 125 pressure zones - PowerPoint PPT Presentation
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Seismic Improvement Program
Presented to:The Northern California Earthquake
Hazards Workshop February 12, 2014
Water Treatment and Distribution
1,300,000 customers331 square-mile area~ 4,000 miles of pipe~ 135 pumping plants~ 180 reservoirs/tanks~ 125 pressure zonesElevation: MSL-1450 ft
Seismic Hazards in Service Area
Pressure Zone Damage
Predicted Damage: Seismic Evaluation Program
• 63% of our customers would be out of water
• Increased fire risk with 1/3 of reservoirs and 2/3 of pumping plants out of service
• Claremont Tunnel would be out of service • 5,500 pipeline breaks• 4 of 6 treatment plants would be out of
service
Capital Improvement Program
Package #1 ($3 million)―Improve service after smaller earthquakes
Package #2 ($84 million)– Limited service improvements after Hayward
M-7 Package #3 ($189 million)
– Improved service after Hayward M-7
Package #4 ($288-$360 million) – Low priority, low benefits
Water Treatment Plants
Column
WeldColumn Flange
Beam Flange
Backing Bar
Fracture During Earthquake
Beam-Column Connection
Structural system is a welded steel moment frameDesigned to the 1982 Uniform Building CodeSeismic Improvement Program implemented in 1994 to provide life safety for all occupied structuresLessons learned from the 1994 Northridge Earthquake• Welded joints do not perform as designed
Beam
Main Administration Building
Viscous Damper in Diagonal Brace State Office Building Project, San Francisco
Piston Damper Detail
Pumping Plants
Implementation -Tank Seismic Upgrade
Shotcrete over New Anchors Prestressed Strands
Shotcrete Cover
Emergency Bypass System
• Manual isolation valves and by-pass manifolds– Isolate ruptured pipe and restore flow with
temporary hoses
Pipeline Fault Crossings and Backbone Pipe at Landslides
Supplying the West of Hills
Southern Loop Pipeline
• 11-miles• 30 inch to 42 inch
diameter • 1,800 ft. of 9 ft.
dia. tunnel
• Connects Southern Part of Service Area
Claremont Tunnel Crosses the Hayward Fault
Claremont Tunnel Before Upgrade
STA b 9+ 09 TO STA b 8 + 0 1
R 9'-5"5'-0"
4'-0"
R 8'-3"
CC
CC
C
` TUNNEL
4'-0"
# 5 @ 1 2"
DESIG N LINE
#4 @ 7 1 /2 "
# 5 @ 7 1/2 "
#5 @ 12 "
# 5 @ 7 1/2 "
# 5 @ 12"
# 10 @ 7 1/2 "
# 9 @ 7 1/2 "
#5 @ 12"
#4 @ 1 2"
# 4 @ 7 1/2 "
# 4 @ 12"SL TUNNEL
4 '-1 9/16 "
1'-0" SL
SIDE DRIFTS
STA b 9 + 09 TO STA b 8+ 01
R 9 '-5"5'-0"
4'-0"
R 8'-3"
CC
CC
C
` TUNNEL
4'-0"
# 5 @ 12"
DESIG N LIN E
# 4 @ 7 1/2 "
# 5 @ 7 1/2 "
#5 @ 12 "
#5 @ 7 1/2 "
#5 @ 12 "
#10 @ 7 1 /2 "
# 9 @ 7 1/2 "
#5 @ 12"
#4 @ 12"
# 4 @ 7 1/2 "
# 4 @ 12"SL TUNN EL
4 '-1 9/16 "
1'-0" SL
SIDE DRIFTS
PlanConfiguration after design earthquake
b 8+00
b 9+00
V A ULT
`
V A ULTTRA N SITIO N
V A ULTTRA N SITIO N
b 8+00
b 9+00
V A ULT
`
V A ULTTRA N SITIO N
V A ULTTRA N SITIO N
Section
8.5ft 8.5ft
carrier pipei.d: 6ft; length: 85ft
Mokelumne Aqueduct No. 3
Elastomeric seismic isolation bearing install on 351 pipe supports
San Pablo Dam Seismic Upgrade
Chabot Dam Seismic Upgrade
Dam Remediation Design Alternatives
Cement Deep Soil Mixing (CDSM)Conventional Earth Replacement
Questions
Timothy McGowanAssociate Civil Engineer
P.O. Box 24055Oakland, CA 94623
(510) 287-1981