1947 Water Main Improvements
Project Authorization
(CIP #C801224)
8h_supp
Item No.
February 11, 2025Date of Meeting
Requested Action
Request Commission authorization for the Executive Director to:
1) transfer authorization and up to $3,200,000 of budget from
the C801042 Landside Pavement Program to support
additional pavement rehabilitation, and
2) take all steps necessary to complete the 1947 Water Main
Improvements project located at Seattle-Tacoma International
Airport.
The amount requested for authorization is $12,200,000 for a
total project authorization of $13,300,000.
2
Utility Master Plan
3
Recommended Water System Utility Needs
Legend
Capacity
Condition
Project Driven
Vision
N
Project Purpose and Original Scope
4
CIPP Installation on
Snoqualmie Pass
Purpose:
Mitigate the risk of future critical failures of the existing
1947 water main, nearing the end of its service life.
Original Scope of Work:
• Rehabilitation of existing water main with Cured-In
Place Pipe (CIPP) liner and surface restoration
• Rehabilitation of S 182
nd
St entrance/exit roadways
pavement (Landside Pavement Program C801042)
Project Development
• During preliminary design project experienced significant cost
increases due to water main operating pressure and
construction requirements
• Project scope changed to conventional pipe replacement since
lower overall cost and longer service life
• Included additional scope to address failing infrastructure at
Bridge 2 and Terminal South Bus Stops
5
Project Location
6
Main Garage
Main Terminal
New water main
Landside Pavement,
Bridge 2, and Terminal
South Bus Stops
Original Budget: $2,263,000
Current Budget: $13,300,000
Completed 30% Design
Cost increase due to:
• Change to pipe replacement
($9.9M)
• Bridge 2/South Bus Stops scope
addition ($3.4M)
Preliminary Project Schedule:
• Construction Start Q4 2025
• In-Use Date Q4 2026
Design-Bid-Build Project Delivery
Construction around 2026 FIFA
World Cup moratorium dates
Project Budget and Schedule
7
Cone of Certainty
8
We are
here
QUESTIONS?
9
