PORT OF SEATTLE 
MEMORANDUM 

COMMISSION AGENDA             Item No.      6d 
Date of Meeting   February 23, 2010 
DATE:    January 27, 2010 
TO:     Tay Yoshitani, Chief Executive Officer 
FROM:    Michael Ehl, Director, Airport Operations 
George England, Program Leader, Aviation Capital Improvement Program 
SUBJECT:  8th Floor Weather Proofing of Seattle-Tacoma International Airport Parking
Garage (CIP #: C800274). 
Amount of This Request: $600,000         Source of Funds: Airport Development Fund
ACTION REQUESTED: 
Request authorization for the Chief Executive Officer to advertise for a consultant for the 8th 
Floor Weather Proofing project at the Seattle-Tacoma International Airport (Airport), to execute
a contract for design services in the amount of $600,000, and to perform contract administration. 
SYNOPSIS: 
The 8th Floor Weather Proofing project is the first of a series of projects in the Airport Parking
Garage intended to rehabilitate the garage and adjacent service tunnel. Portions of the facility
have been in service for over 40 years, with the newest sections having been in service for more
than 10 years. This project, and those that follow, seek to extend the lifespan of these valuable
Airport assets. The parking garage is the largest non-airline revenue source at the Airport, and
revenues are expected to grow over time with the introduction of special event parking made
possible by LINK light rail service at the Airport and greater parking capacity with the return of
several floors of parking when the rental car companies move to the Rental Car Facility in 2012. 
This project will replace the failing weatherproofing membrane, expansion joints, and flashing
on the 8th (top) floor of the Airport Parking Garage. The work will also include preparation of
the underlying slab to accept these replacement roofing materials. The project is necessary to
preserve the integrity of the garage structure, prevent leaks, and to protect customer's cars
below. The total cost of the project is estimated at $13,050,000.

COMMISSION AGENDA 
T. Yoshitani, Chief Executive Officer 
January 27, 2010 
Page 2 of 6 
BACKGROUND: 
The 8th Floor Weather Proofing project is the first of a series of projects intended to rehabilitate
and seismically stabilize the Parking Garage and service tunnel at the Airport. The 8 th Floor
Weather Proofing project is considered the most critical project to stabilizing the deterioration of
the Parking Garage structure. The 8th Floor Weather Proofing effort will restore the weathertight
seal the 8th floor provides to the floors below. Water currently passes through several of the
floor slabs and expansion joints, leading to lime deposits and other water-related damage to
customer vehicles. The Garage has also experienced structural damage that includes spalling and
phosphorescence, as concrete leaches from the floor slab. This project, and those that will
follow, seek to extend the lifespan of these valuable Airport assets. 
PROJECT DESCRIPTION/SCOPE OF WORK: 
Project Statement: 
Preserve and protect the Airport Main Parking Garage by weatherproofing the 8th floor. 
Project Objectives: 
Minimize capital and lifecycle costs 
Provide a solution that has an effective life of 10 or more years 
Preserve and protect a critical revenue-generating Port asset 
Improve customer service by restoring parking capacity (180 spaces) that has been taken out
of service due to leaks in the weatherproofing membrane 
Provide a safe and functional facility that generates maximum revenue, and reduces
operating costs by performing reliably and requiring minimal maintenance 
Scope of Work: 
The 8th Floor Weather Proofing project will include the following elements: 
Conditions assessment, design, development of materials and construction specifications 
Removal and replacement of approximately 600,000 square feet (as may be adjusted
following complete condition assessment) of failing weatherproofing membrane with more
durable materials. The current membrane, which is between 11 and 20 years old (depending
on location), has delaminated, decomposed, been peeled, cut, burned or gouged and is now
allowing water infiltration. 
Rehabilitate the roof slab addressing cracks, ponding, and leaking issues 
Reduce water infiltration in elevator lobbies

COMMISSION AGENDA 
T. Yoshitani, Chief Executive Officer 
January 27, 2010 
Page 3 of 6 
Remove and replace or upgrade approximately 2,000 feet (as may be adjusted following
complete condition assessment) of existing expansion joints, moving to a common design
standard if possible. 
Remove and replace failed elevator shaft flashing. 
The requested action authorizes procurement of design services for the 8th Floor Weather
Proofing project. A future Commission action will request the authority to construct the 8th 
Floor Weather Proofing project. 
STRATEGIC OBJECTIVES: 
This project supports the Port's strategy to "Ensure Airport Vitality" and to "Exhibit
Environmental Stewardship through our Actions." 
FINANCIAL IMPLICATIONS: 
Budget/Authorization Summary 
This budget and authorization summary is for the 8th Floor Weather Proofing (CIP #C800274): 

Original Budget                              $13,050,000
Budget Increases                                    $0
Budget Transfers                                  ($0)
Revised Budget                             $13,050,000
Previous Authorizations                               $0
Current request for Authorization                     $600,000
Total Authorizations, including this request               $600,000
Remaining Budget to be Authorized                $12,450,000

Project Cost Breakdown 
Outside Professional Services                        $500,000
Port Costs                                     $100,000
Total                                         $600,000

COMMISSION AGENDA 
T. Yoshitani, Chief Executive Officer 
January 27, 2010 
Page 4 of 6 
Source of Funds 
The 8th Floor Weather Proofing project (CIP #C800274) is included in the 2010-2014 capital
budget and plan of finance as a business plan prospective project. The source of funds for this 
project, as identified in the plan of finance, is the Airport Development Fund. 
Financial Analysis Summary 
The Airport Parking Garage is the largest non-airline revenue source at the Airport, with
revenues in 2009 of $51.9 million. Portions of the facility have been in service for over 40 years,
with the newest sections having been in service for more than 10 years. Parking revenues are
expected to grow over time with special event parking driven by the introduction of LINK light
rail service to the Airport, and the return of several floors of parking when the rental car
companies operating on floors one and two move to the Rental Car Facility (RCF) in 2012. 
The 8th Floor Weather Proofing project is categorized as a Renewal/Replacement project. 
CIP Category                 Renewal/Replacement 
Project Type                  Renewal/Replacement 
Risk adjusted Discount Rate        N/A for Renewal/Replacement 
Key risk factors                 construction/A for Renewal/Replacement 
Project cost for analysis            $13,050,000 
Business Unit (BU)             Operations, Landside  Public Parking 
Effect on Business Performance      See discussion below 
IRR/NPV                N/A for Renewal/Replacement Projects 
CPE Impact                 None 
ECONOMIC IMPACTS: 
The Airport Parking Garage provides the largest source of non-airline revenues for the Airport
and is also an important revenue source for the City of SeaTac through a parking tax. Correcting
the weatherproofing system failures on the 8th floor will restore the facility to its full revenue
generating potential. 
ENVIRONMENTAL SUSTAINABILITY/COMMUNITY BENEFITS: 
The 8th Floor Weather Proofing project will restore and extend the life of one of the Airport's 
most heavily used assets. Preserving and restoring this valuable asset is in keeping with Port

COMMISSION AGENDA 
T. Yoshitani, Chief Executive Officer 
January 27, 2010 
Page 5 of 6 
environmental policy as it reduces long term capital and operating costs, is environmentally
sustainable, and conserves resources. By extending the useful life of this asset, reconstruction
can be delayed. Additionally, the project will implement environmental and sustainability
performance measures into the project. These include, but are not limited to, removing any
asbestos, lead paint, or other material encountered, recycling the existing weather proofing and
expansion joint material and utilizing durable low-Volatile Organic Compound containing
weather proofing material wherever practicable.
TRIPLE BOTTOM LINE SUMMARY: 
The 8th Floor Weather Proofing project protects a valuable Airport asset, returns it to full revenue
generating capacity, and preserves it in a manner that will extend its useful service life. This
maximizes the return on investment realized from this facility, and minimizes the environmental
impact of the facility, while maximizing the benefit to both the Airport and the surrounding
community. 
PROJECT SCHEDULE: 
The following is a list of key milestone dates for the 8th Floor Weather Proofing project. 
Design Procurement             March-June 2010 
Design Start                    June 2010 
Design Complete               December 2010 
Bid Advertisement              February 2011 
Construction Start                May 2011 
Construction Complete            October 2012 
ALTERNATIVES CONSIDERED/RECOMMENDED ACTION: 
Complete the Project  Under this alternative, the existing 8th floor weatherproofing membrane
of the Parking Garage will be removed and the slab will be prepared for a new weatherproofing
membrane; flashing and expansion joints will also be replaced. This will preserve and protect
the Airport's asset, create the least environmental impact, and allow the garage to operate at full
capacity throughout the year. This is the recommended alternative. 
Do-Nothing  In this alternative, the existing weatherproofing system would be repaired on an
as-needed basis. This is the current situation. In lieu of rehabilitation, parking spaces have been
removed from service, increasing from 120 spaces in 2008 to 180 spaces in 2009. Water is now
infiltrating several floors below the 8th floor through leaks in the 8th floor waterproofing
membrane. The Parking Garage is the largest single revenue source at the Airport. This asset
will continue to deteriorate at an accelerated rate under this alternative. This could ultimately
affect the structural integrity of the garage. This is not the recommended alternative.

COMMISSION AGENDA 
T. Yoshitani, Chief Executive Officer 
January 27, 2010 
Page 6 of 6 
PREVIOUS COMMISSION ACTION: 
No previous Commission actions have been taken on CIP # C800274. 
ATTACHMENTS: 
Pictures of existing conditions - 8th floor of Airport Parking Garage.