PORT OF SEATTLE 
MEMORANDUM 
COMMISSION AGENDA                   Item No.         6a 
Date of Meeting    November 30, 2010 
DATE:      November 3, 2010 
TO:         Tay Yoshitani, Chief Executive Officer 
FROM:     David Soike, Director, Aviation Facilities and Capital Program 
Wayne Grotheer, Director, Aviation Project Management Group 
SUBJECT:   South End Main Terminal Re-roof Project at Seattle-Tacoma International Airport
(CIP # C800360). 
This Request:  $2,520,000                      Source of Funds: Airport Development
Total Project Budget: $2,640,000                Fund and existing Revenue Bond Proceeds 
Sales Tax Paid: $188,000                        Jobs Created: 20 
ACTION REQUESTED: 
Request Commission authorization for the Chief Executive Officer to advertise for construction
bids, award and execute the contract and construct a new roofing system on the South End of the
Main Terminal at Seattle-Tacoma International Airport. The amount of this request is
$2,520,000. The total cost of the project is estimated to be $2,640,000. 
SYNOPSIS: 
This memorandum requests authorization to proceed with the bid, award, execute the contract
and proceed with the removal and replacement of the current roofing system on the south end of
the Main Terminal in order to avoid leaks that cause damage to the underlying infrastructure,
equipment, and interior facilities. Portions of the roof being replaced were installed in 1993,
1994 and 1996 and will be at or beyond their useful life expectancy when replacement takes
place. The airlines have approved this project. 
BACKGROUND: 
In 1991, the Airport began a major Terminal Facility re-roofing program that was completed in
1997. Since 1997, certain Airport roofs have been replaced on a project/roof specific basis. 
This project is initiating the next cycle of roof replacements. The Airport's current roofs have a
15 year life expectancy of which a large percentage have expired or will expire shortly.

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
November 3, 2010 
Page 2 of 5 
The Airport's roof replacement program has been prioritized and phased over the next 6-10 years
by a team comprised of Engineering, Maintenance, and Project Management. This first phase of
the program was triggered by leaks and the discovery of fractured roof membranes over the last
several years. Replacement reduces the potential for facility damage and liability risks
associated with roof leaks. This is necessary in order to provide safe and reliable facilities to our
business partners, tenants, and the traveling public. 
PROJECT DESCRIPTION/SCOPE OF WORK: 
Project Objectives: 
This project will remove and replace the existing roof system at the south end of the Main
Terminal, eliminating costly leak repair and potential damage to existing infrastructure. 
Scope of Work: 
Remove and replace existing roof system and install a new 65 millimeter elastomeric roofing
system on the south end of the Main Terminal, sections: M-1, M-2, M-10, M-12, MP-2 and MP-
3 (see attached map), which totals approximately 90,000 square feet. 
STRATEGIC OBJECTIVES: 
Ensure Airport and Seaport Vitality 
This project supports the Port-wide strategic objective of Ensuring Airport and Seaport Vitality.
This project will maximize facility and asset utilization by replacing the Airport's roof systems
before they fail through a systemic and timely roof replacement program. Secure and dry
terminal spaces help to facilitate use of the Airport by the traveling public. 
Exhibit Environmental Stewardship through Our Actions 
This project is consistent with the Port's goal of improving the long-term sustainability of its
facilities and operations by replacing equipment that has reached the end of its useful life. This
project will reduce risk and liability issues, and safeguard the integrity of the building envelope
and underlying infrastructure from water infiltration due to failing roof systems.
FINANCIAL IMPLICATIONS: 
Budget/Authorization Summary 
Original Budget                                                    $ 2,640,000 
Budget increase                                                              $0 
Budget Transfers                                                                           $0 
Revised Budget                                                  $ 2,640,000 
Previous Authorizations                                             $ 120,000
Current request for authorization                                       $ 2,520,000

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
November 3, 2010 
Page 3 of 5 
Total Authorizations, including this request                            $ 2,640,000 
Remaining budget to be authorized                                  $ 0 
This        Total
Project Cost Breakdown (This Authorization)                       Request       Project 
Construction costs                                                    $ 1,992,000    $ 1,992,000 
Design                                                                        $ 76,000 
Project Management and other soft costs                             $ 340,000   $ 384,000 
Sales tax                                                                 $ 188,000    $ 188,000 
Outside professional services                                          $ 0    $ 0
Other                                                                 $ 0    $ 0 
Total                                                                   $ 2,520,000   $ 2,640,000 
Source of Funds 
This project, CIP # C800360, is included in the 2010  2014 capital budget and plan of finance
as a business plan prospective project. The funding source for this project will be the Airport
Development Fund and existing revenue bond proceeds. The airline representatives reviewed
this project in February 2010, voiced positive support, and voted favorably through a Majority-
In-Interest vote in March 2010. In February, the airlines were made aware of other future roof
replacements that would be presented to them for vote on a project-by-project basis. 
Financial Analysis Summary 
CIP Category                       Renewal/Enhancement 
Project Type                         Renewal & Replacement 
Risk adjusted Discount Rate          N/A 
Key risk factors                       N/A 
Project cost for analysis               $2,640,000 
Business Unit (BU)                  Terminal 
Effect on Business Performance      NOI after depreciation will increase 
IRR/NPV                      N/A 
$0.01 in 2012 but no change compared to business
CPE Impact 
plan forecast as this project was included. 
As a cost recovery project, traditional financial analysis measures such as net present value
(NPV) and internal rate of return (IRR) are not meaningful.
OPERATION & MAINTENANCE (O&M) IMPLICATIONS: 
O&M costs would essentially remain the same. In order to maintain the warranty, the regular
roof system preventive maintenance and inspection activities will be applied to the new roof.

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
November 3, 2010 
Page 4 of 5 

ECONOMIC IMPACTS: 
The project does not create any incremental economic impacts apart from supporting the existing
operations of the Airport. 
ENVIRONMENTAL/COMMUNITY BENEFITS: 
The new roof will be Energy Star rated and have a minimum solar reflective index that exceeds
78, which is the value required to obtain the LEED Credit NC7.2. This will reduce air
conditioning loads and save energy. The insulating value of the new roof will be greater than
that of the existing roof, because of new energy code requirements. By replacing the roof and
preventing damage to the underlying building systems, the life of the existing building systems
will be prolonged.
TRIPLE BOTTOM LINE SUMMARY: 
This roof replacement project represents an investment in our current facility and supports the
long-term vitality of the Airport, businesses within the Airport, and the traveling public.
Installation of new Energy Star roofing system will reduce the energy demand of the Airport
through insulating against heat loss. Replacing the roof will prevent water leak damage to other
building systems, disruption of Airport operations, and will prevent perceptions of poor customer
service. 
PROJECT SCHEDULE: 
The following is a list of key milestone dates for the Main Terminal South End Roof
Replacement: 
Request for an Authorization to Award the Contract                April 2011 
Project Completion                                      November 2011 
ALTERNATIVES CONSIDERED/RECOMMENDED ACTION: 
Alternative 1: Develop a systematic replacement program for the Airport's roof systems. Phase
the replacement program over multiple years, which allows the Airport to sustain serviceable
roof systems and provide safe and productive environments for our business partners and
passengers. Through roof inspection and analysis, the first phase of the roof replacement
program has identified 90,000 square feet of roof at the south end of the Main Terminal. This
phase is intended to be designed in 2010 with actual roof replacement to be accomplished 2011.
The rest of this prioritized replacement program would be accomplished over the next ten years
and be approved on a project-by-project basis. This process/alternative requires securing
necessary approvals and funding for each specific phase of the roof replacement program.
This is the recommended alternative.

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
November 3, 2010 
Page 5 of 5 

Alternative 2: Install a green roof system. Green roofs are complete roof systems comprised of
vegetation, soil, drainage and waterproof membrane, requiring specific additional structural
integrity not currently in place as part of the Airport structure. This alternative would create an
environment that would attract birds and other wildlife, increase bird strike hazards, and escalate
nuisance-wildlife control. Installing a green roof would be in direct conflict with the Airport's
Wildlife Hazard Mitigation and Wildlife conservation Program and the FAA approved Airport
Certification Manual. This is not the recommended alternative. 
Alternative 3: Continue to patch and repair the leaks risking continued deterioration throughout
the entire roof system (terminal and concourses). This alternative increases maintenance and
emergency repair response and costs, not only due to the continual patching of the existing roof
system but also due to ceiling, floor, and equipment damage caused by the leaks. This also
increases liability should customers slip and fall. This is not the recommended alternative. 
OTHER DOCUMENT ASSOCIATED WITH THIS REQUEST:
Roof Replacement Planning Map. 
PREVIOUS COMMISSION ACTIONS AND BRIEFINGS: 
On April 27, 2010, the Commission approved the design and preparation of bid documents for
the replacement of approximately 90,000 square feet of roof systems located on the south end of
the Main Terminal at Seattle-Tacoma International Airport (CIP # C800360) for a cost of
$120,000. 
On September 22, 2009, the Commission was briefed on facility renewal projects that were
necessary in future years. The Airport re-roofing program was included in the presentation.