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Seismic Improvement Program

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

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Seismic Improvement Program

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  1. Seismic Improvement Program Presented to: The Northern California Earthquake Hazards Workshop February 12, 2014

  2. 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 • Elevation: MSL-1450 ft

  3. Seismic Hazards in Service Area

  4. Pressure Zone Damage

  5. 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

  6. Capital Improvement Program • Package #1 ($3 million) • Improve service after smaller earthquakes • Package #2 ($84 million) • Limitedservice improvements after Hayward M-7 • Package #3 ($189 million) • Improved service after Hayward M-7 • Package #4 ($288-$360 million) • Low priority, low benefits

  7. Water Treatment Plants

  8. Main Administration Building Column Beam Column Flange Weld Beam Flange Backing Bar Fracture During Earthquake Beam-Column Connection • Structural system is a welded steel moment frame • Designed to the 1982 Uniform Building Code • Seismic Improvement Program implemented in 1994 to provide life safety for all occupied structures • Lessons learned from the 1994 Northridge Earthquake • Welded joints do not perform as designed

  9. Piston Damper Detail Viscous Damper in Diagonal Brace State Office Building Project, San Francisco

  10. Pumping Plants

  11. Implementation -Tank Seismic Upgrade Shotcrete over New Anchors Prestressed Strands Shotcrete Cover

  12. Emergency Bypass System • Manual isolation valves and by-pass manifolds • Isolate ruptured pipe and restore flow with temporary hoses

  13. Pipeline Fault Crossings and Backbone Pipe at Landslides

  14. Supplying the West of Hills

  15. 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

  16. Claremont Tunnel Crosses the Hayward Fault

  17. Claremont Tunnel Before Upgrade

  18. carrier pipe i.d: 6ft; length: 85ft 8.5ft 8.5ft Plan Configuration after design earthquake Section

  19. Mokelumne Aqueduct No. 3 Elastomeric seismic isolation bearing install on 351 pipe supports

  20. San Pablo Dam Seismic Upgrade

  21. Chabot Dam Seismic Upgrade

  22. Dam Remediation Design Alternatives Conventional Earth Replacement Cement Deep Soil Mixing (CDSM)

  23. Questions Timothy McGowan Associate Civil Engineer P.O. Box 24055 Oakland, CA 94623 (510) 287-1981

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