Item No.
Date of Meeting

1947 Water Main Improvements
Project Authorization
(CIP #C801224)

8h_supp
February 11, 2025

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
Recommended Water System Utility Needs

N
Legend
Capacity
Condition
Project Driven
Vision

3

Project Purpose and Original Scope
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 182nd St entrance/exit roadways
pavement (Landside Pavement Program C801042)

CIPP Installation on
Snoqualmie Pass
4

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
Main Terminal

Landside Pavement,
Bridge 2, and Terminal
South Bus Stops

Main Garage

New water main

6

Project Budget and Schedule
Original Budget:
Current Budget:

$2,263,000
$13,300,000

Preliminary Project Schedule:
• Construction Start Q4 2025
• In-Use Date Q4 2026

Completed 30% Design
Design-Bid-Build Project Delivery
Cost increase due to:
• Change to pipe replacement
($9.9M)
• Bridge 2/South Bus Stops scope
addition ($3.4M)

Construction around 2026 FIFA
World Cup moratorium dates

7

Cone of Certainty

We are
here

8

QUESTIONS?

9