COMMISSION
AGENDA MEMORANDUM

Item No.

ACTION ITEM

Date of Meeting

DATE:

April 11, 2025

TO:

Stephen P. Metruck, Executive Director

FROM:

Eileen Francisco, Director, Aviation Project Management
Keri Stephens, Director, Aviation Facilities and Capital Programs

8e
April 22, 2025

SUBJECT: Water Reservoir Rehabilitation CIP #C801172 Additional Authorization Request
Amount of this request:
Total estimated project cost:

$1,600,000
$5,169,000

ACTION REQUESTED
Request Commission authorization for the Executive Director to increase the Capital
Improvement project authorization for the Water Reservoir Rehabilitation project by $1,600,000.
The amount of this request is for $1,600,000 for a revised total estimated project cost not to
exceed $5,169,000.
SUMMARY
The 2-million-gallon water reservoir at Seattle-Tacoma International Airport is an above ground
steel tank that provides water storage for domestic use and fire suppression to the entire airport.
This project will rehabilitate the structure to extend its useful life. The scope of this project was
based off a September 2021 inspection report which indicated that severe corrosion has
appeared in many areas on the reservoir and, if not addressed, could result in deformation of the
structure. The presence of rust also puts the water quality into jeopardy. Roof repairs in addition
to the coating replacement were not included in the report but became apparent once the
contractor entered the tank and evaluated the current tank conditions.
The project was advertised for bids on July 9th, 2024, and was awarded to T-Bailey on August 29,
2024. The contractor mobilized and entered the tank to examine existing conditions on
January 21, 2025, when they observed severe corrosion of the roof. A full roof replacement was
recommended since it would be significantly more costly to repair the existing roof structure. On
January 28th, 2025, the project structural engineer arrived on site to visually inspect the roof and
concurred that, due to the amount of corrosion, the roof requires replacement. A change order
will be developed to execute this work.
There are no attachments to this memo.

Template revised April 12, 2018.