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Board Update:
Seismic Vulnerability Results Workshop
March, 2019
1
Agenda
Work Progress
Level of Service Goals and Performance Objectives
Seismic Vulnerability Assessments
Discussion, Questions, and Comments
2
Work Progress
3
Work Progress
Completed Tasks:
LOS Goals
Performance Objectives
Geotechnical Analysis
Tasks In Progress:
Finalizing Vulnerability Assessments
Assessing Interdependencies
Planned Tasks:
ID Upgrades
Estimate Costs
Prepare Report
4
Level of Service Goals
5
LOS Goals – CSZ Seismic Event
Conveyance Pump Stations & Pipelines
6
LOS Goals – CSZ Seismic Event
Treatment Facilities
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Performance Objectives
8
Performance Objectives – Seismic
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Seismic Vulnerability Assessments
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Assessment Completed by Separating Into:
Buried Pipes and Utilities
Facilities and Structures
Process Capacity and Flow Path
Structural Components:
Above Grade
Below Grade
Non-Structural Components
Process equipment and pipes
Utility equipment, pipes, and conduits
Miscellaneous Items
11
Overall Findings:
Geotechnical Conditions:
No significant areas of:
Liquefaction
Landslides or slip plane failures
Peak ground accelerations and velocities:
Considered to be moderate
Within design values for recent projects.
Three areas along East Bank Interceptor identified for future site-specific analysis
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Liquefaction Susceptibility
13
Landslide Probabilities
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Collection System (Liquefaction/Settlement)
Canoe Way/
Patterson Slough Siphon
Q Street Floodway Siphon
Goodpasture Is. Rd. Siphon Delta Hwy. Siphon A
Delta Hwy. Siphon B
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Peak Ground Acceleration
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Peak Ground Velocity
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Structural Observations – Pump Stations
Irvington PS
Anchors Needed to Attach Equip. to Base
Buried PS with no major structural deficiencies
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Structural Observations – Pump Stations
Glenwood PS
Overall moderate only moderate upgrades identified.
Existing cracks should be analyzed to determine cause and then repaired.
19
Structural Observations – Pump Stations
Wet Weather PS/Facility
Building will likely collapse due “free story” type of failure mechanism; roof is not adequately attached to walls.
20
Structural Observations – Pump Stations
Willakenzie PS
Overall moderate only moderate upgrades identified.
Cracks in older section of PS should be analyzed to determine cause and then repaired.
Electrical equipment should be assessed for seismic vulnerability – anchorage and bracing
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Structural Observations – Owasso Bridge
Beam-pier connection may fail causing failure of bridge
Force main
Power conduits
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Seismic Vulnerability Assessment Treatment
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Phase 1 - Immediately after CSZ event
(0 – 1 days)
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Phase 2 – Intermediate-Term (1 to 2 Weeks)
High Rate Disinfection
IPS and Headworks
Primary Clarification
25
Phase 3 – Long-Term (3 to 6 Months)
Disinfection
IPS and Headworks
Primary Clarification
26
Typical Structural Deficiencies for Treatment Facilities
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Typical Nonstructural Deficiencies for Collection System
Adequate lateral bracing
Inadequate lateral bracing or anchoring
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Next Steps
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Next Steps
Identify the upgrades needed to address the vulnerabilities identified
Meeting 5: Interdependencies and Flood Assessment Review
Last week of April
MWMC
Review draft TM 4
Provide review comments for Carollo Team to address
30
Discussion, Questions, and Comments
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