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Department NameSeattle Public Utilities1 Seattle Public Utilities
Ship Canal Water Quality ProjectProject Overview
Keith Ward, PMP, PE, Ship Canal Water Quality Project ExecutiveDecember 5, 2018
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Department NameSeattle Public Utilities2
Ship Canal Water Quality Project
• Project background and overview• Project work in Ballard• Schedule summary• Cost summary
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Department NameSeattle Public Utilities3
Combined Sewer Overflows
King County Water Quality Study
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Department NameSeattle Public Utilities4
2017 Combined Sewer OverflowsM
illio
n Ga
llons
CSO Outfalls
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Department NameSeattle Public Utilities5
Ship Canal Water Quality ProjectConsent decree• With US Department of Justice, US Environmental
Protection Agency, and WA Department of Ecology• Less than 1 combined sewer overflow per outfall
per year on a 20-year moving average
Joint Project• Outfalls: 2 King County, 5 Seattle• Four projects reduced to one• Reduced community impacts• Improved operational flexibility
Joint Project Agreement• 12/8/2015: City of Seattle – 65% of shared costs• 6/21/2016: King County – 35% of shared costs
King County basins
City of Seattle basins
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Department NameSeattle Public Utilities6
Ship Canal Water Quality ProjectThe storage tunnel connects to King County’s West Point Treatment Plant.
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East Ballard Site
(WTD Basin)
North Queen Anne Site(WTD Basin)
Ballard Site(SPU Basin)
Fremont Site(SPU Basin)
Wallingford Site(SPU Basin)
Storage tunnel
Project elements
Neighborhood boundary
WTD Basin
SPU Basin
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Department NameSeattle Public Utilities8
Project Components
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Department NameSeattle Public Utilities9
Construction Techniques
18 ft. 10 in. dia. Storage Tunnel
4 to 7 ft. dia. Trenchless
Conveyance Pipes
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Department NameSeattle Public Utilities10
Project Components - examples
FremontDropShaft
FremontMechanical/ ElectricalStructure
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Department NameSeattle Public Utilities11
Storage tunnel
Project elements
Neighborhood boundary
Neighborhoods2018-20192020-2021H1/2021H2/2021H1/20222022-2024
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Department NameSeattle Public Utilities12
Schedule Summary
12
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Department NameSeattle Public Utilities13
Cost Estimate – Key Factors
base costs escalation
-50%
0%
50%
100%
Design Development -->
uncertainty risks
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Department NameSeattle Public Utilities14
Shared Project Budget
* There is a 70% chance costs will be at or below the estimated cost and a 30% chance the estimated cost will be exceeded.
City of Seattle’s Share ~ $388MKing County’s Share ~ $182M
Shared project budget $570M, 70% confidence*
Cost range $533M to $598M
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Department NameSeattle Public Utilities15
2018-2024 DWW Spending
Other DWW
Projects
Ship Canal Water Quality Project
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Department NameSeattle Public Utilities16
Project Funding
SPU is managing the project’s budget within the 2018-2023 Endorsed Strategic Business Plan (SBP) rate path.
• $540M cost estimate used for SBP• Bond Issue interest savings • Loans
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Department NameSeattle Public Utilities17