Item No.
Date of Meeting

Snow Storage Expansion Phase II
Construction Authorization
CIP# C801171
Seattle-Tacoma
International Airport

8c_supp
October 28, 2025

Action Requested
Request Commission authorization for the Executive Director to
advertise and execute a construction contract for Snow Storage
Expansion Phase II (CIP# C801171) adjacent to the Industrial
Wastewater System (IWS) Lagoon 3.
The total request for this action will be $14,403,000 for a total
project authorization to date of $24,800,000. The estimated overall
cost of the project is $24,800,000.

2

Project Overview
This project is needed to meet regulatory requirements and
operational demands for airfield snow management.
• Provide additional snow storage capacity connected to the
Industrial Wastewater System (IWS)

• Historical excess snow storage areas are now occupied by Cargo/Remaining Overnight
(RON) aircrafts
• Snow storage capacity at completion of the project: 12" precipitation event
• All snow melt areas will be connected to IWS to ensure compliance with National
Pollutant Discharge Elimination Systems (NPDES) Permit Compliance

• Increase operational safety for snow operations vehicles
• Reduce operational expenses from rehandling snow
3

Project Scope
• Phase I - Completed in 2023
- North Snow Storage Area

- Expand existing asphalt pad and upgrade the IWS Pump Station

- South Snow Storage Area

- Expand existing truck turnaround for maneuverability and safety

- Vehicle Service Road (south and west of RW 16L/34R)
- Widen asphalt road for snow removal vehicle safety

• Phase II - 2026 Construction
- Construct New Snow Storage Area adjacent to IWS Lagoon 3

4

Snow Storage Expansion Sites

5

Construction Schedule
• Phase II
- Commission Authorization for Construction Q4 2025
- Issue Notice to Proceed: Q2 2026
- In-Service Q4 2026

6

Budget
Snow Storage Expansion
Project (C801171)

This Request

Total Program

$0

$2,500,000

Construction

$14,403,000

$22,300,000

Total

$14,403,000

$24,800,000

Design

7

Project Risks
RISK

DESCRIPTION

Weather Delay

PROBLEM

IMPACT

MITIGATION PLAN

Construction may be impacted by Low
inclement weather.

Med

Include additional time in
schedule for weather risks.

Increased Cost

Market conditions may change
and result in bids exceeding Port
estimate.

Med

High

Use historical pricing with
thoughtful adjustment for
current market conditions.
Include contingency in the
estimate.

Unforeseen Site
Conditions

Possible conditions include:
• Buried debris
• Archaeological
• Unsuitable soil conditions

Med

High

Implement monitoring and
action plan for construction for
possible discoveries.

8

Project Opportunities
• Support other program scopes and schedules

• Airfield Pavement and Supporting Infrastructure Replacement Program
• Perimeter Intrusion detection System (PIDS)

• Reduce project impacts, schedule and safety risks by avoiding
construction in the winter season.

9

Thank
You!

Operated by the
Port of Seattle

FlySEA.org
10