PORT OF SEATTLE 
MEMORANDUM 
COMMISSION AGENDA               Item No.       6c 
ACTION ITEM             Date of Meeting    July 9, 2013 

DATE:    July 1, 2013 
TO:      Tay Yoshitani, Chief Executive Officer 
FROM:   Wayne Grotheer, Director, Aviation Project Management Group 
David Soike, Director, Aviation Facilities and Capital Program 
SUBJECT:  Concourse D Roof Replacement Project (CIP #C800550) 
Amount of This Request:  $530,000        Source of Funds: Airport Development 
Fund and Future Revenue Bonds 
Est. State and Local Taxes: $227,000         Est. Jobs Created: N/A 
Est. Total Project Cost:    $3,727,000 
ACTION REQUESTED: 
Request Commission authorization for the Chief Executive Officer to prepare design and
construction bid documents for the replacement of approximately 70,100 square feet of roof 
systems located on the Concourse D of the terminal building at Seattle-Tacoma International
Airport for an amount not to exceed $530,000 of a total estimated project cost of $3,727,000. 
SYNOPSIS: 
This project will remove and replace the current roofing system on Concourse D of the main
terminal building at the Airport in order to avoid leaks that cause damage to the underlying
infrastructure, equipment, and interior facilities. The portions of the roof being replaced were
installed in 1991 and 1994 and will be beyond their useful life expectancy when replacement
takes place. This is the third of a series of necessary progressive design and construction steps to
accomplish reroofing of the Airport facilities over the next several years. W arranties on existing
roofs have expired and testing of roof membranes by Airport maintenance staff indicates they are
deteriorating. The replacement roof will be Energy Star rated and will save energy over its
lifetime. Staff expects to seek Commission authorization annually over the next five years as
part of a long-term roofing maintenance program. 
This project was included in the 2013 Aviation Division's capital budget and plan of finance 
with a budget of $1,927,750. The budget increase is primarily due to the need to work around
the newly-installed pre-conditioned air piping, as well as for the installation of ladders, stairs and
fall protection and the refurbishment of existing skylight windows.

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
July 1, 2013 
Page 2 of 5 
BACKGROUND: 
In 1991, the Airport began a major terminal facility re-roofing program that was completed in
1997. Since 1997, some Airport roofs have been replaced on a project- or area-specific basis.
The first phase of the cycle of completed roof replacements included sections on the south end of
the Main Terminal.  The second phase of the cycle that is now underway includes the Fire
Station, which was replaced in 2012, and sections on the north end of the Main Terminal that
will be replaced this year. 
This project is the third phase of the cycle of roof replacement projects at the Airport. It includes
numerous sections of the Concourse D roof (sections B, B-1, C, C-1, D, D-1, E, E-1, F, G,H, 
and J on the attached map). When originally built, the Airport's current roofs had a 15-year life
expectancy that has expired. 
PROJECT JUSTIFICATION: 
Maintaining Airport roofing systems supports the Port's objective to provide safe and functional
facilities.  As a critical system, the Concourse D roof must be replaced as it ages. The current
roofing system on Concourse D has reached the end of its dependable, leak-free, life span.
When the roofing system fails and leaks emerge, they must be corrected on an emergency basis
in order to preserve underlying infrastructure and provide good customer service.  Delaying
repairs until leaks require emergency attention tends to be more expensive due to scheduling
pressures. In addition, repairing damage from leaks inside the terminal can be extensive and
expensive. Proceeding with replacement of the Concourse D roof will preserve the Airport's
infrastructure investments and support an outstanding customer experience for travelers and
tenants. 
Project Objectives: 
This project will remove and replace existing roof systems on Concourse D of the Airport. 
PROJECT SCOPE OF WORK AND SCHEDULE: 
Scope of Work: 
Remove and replace the existing roof system on Concourse D at the Airport and install a new 65
millimeter elastomeric roofing system. Remove and replace two skylights and make repairs to
existing skylight window/walls. The Concourse D roof system is approximately 70,100 square
feet. Design will be completed using in-house design services. 
Schedule: 
Commission Authorization to Design:                        July 2013 
Commission Authorization for Construction                December 2013 
Issue Notice to Proceed                                  June 2014 
Construction Complete                              October 2014

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
July 1, 2013 
Page 3 of 5 
FINANCIAL IMPLICATIONS: 
Budget/Authorization Summary:            Capital     Expense    Total Project 
Original Budget                      $1,927,750         $0     $1,927,750 
Current Budget Increase                 $1,325,050     $474,200     $1,799,250 
Revised Budget                     $3,252,800     $474,200     $3,727,000 
Previous Authorizations                       $0         $0           $0 
Current request for authorization              $501,800      $28,200       $530,000 
Total Authorizations, including this request      $501,800      $28,200       $530,000 
Remaining budget to be authorized         $2,751,000     $446,000     $3,197,000 
Total Estimated Project Cost              $3,252,800     $474,200     $3,727,000 
Project Cost Breakdown:                   This Request         Total Project 
Construction                                   $0           $2,388,000 
Construction Management                        $0           $359,000 
Design                                  $430,000            $430,000 
Project Management                        $100,000           $287,000
Permitting                                     $0             $36,000 
State & Local Taxes (estimated)                       $0            $227,000 
Total                                     $530,000           $3,727,000 
Budget Status and Source of Funds: 
This project was included in the 2013-2017 capital budget and plan of finance as a business plan
prospective project with a budget of $1,927,750. Upon completion of the project notebook, the
project budget was increased to $3,727,000. The increase in budget is related to the installation
of ladders, stairs and fall protection at mechanical penthouses ($48,000), refurbishment of the
existing skylight/windows ($474,200) and the additional costs associated with working around
newly-installed pre-conditioned air piping ($1,277,250). The funding source will be the Airport
Development Fund and future revenue bonds. The Port plans to issue revenue bonds in 2014 to
fund a number of projects. The budget increase will be transferred from the Aeronautical
Allowance CIP (C800404), resulting in no net change to the capital budget.
Financial Analysis and Summary: 
CIP Category             Renewal/Enhancement 
Project Type              Renewal & Replacement 
Risk adjusted discount rate     N/A 
Key risk factors             N/A 
Project cost for analysis        $3,727,000 
Business Unit (BU)          Airfield (Fire Dept) and Terminal 
Effect on business performance  NOI after depreciation will decrease slightly 
IRR/NPV             As a cost recovery project, traditional financial analysis
measures such as net present value (NPV) and internal
rate of return (IRR) are not meaningful. 
CPE Impact             $0.01 by 2015 but no change to business plan forecast
as this project was included.

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
July 1, 2013 
Page 4 of 5 
STRATEGIC OBJECTIVES: 
This project supports the Port's Century Agenda objective of meeting the region's air
transportation needs at the Airport for the next 25 years. The Airport must maintain its existing
terminal to accommodate current as well as future passenger and cargo levels. 
ENVIRONMENTAL SUSTAINABILITY: 
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. By replacing the roof and preventing damage to the underlying building
systems, the life of the existing building systems will be prolonged. 
BUSINESS PLAN OBJECTIVES: 
Replacing the most distressed Airport roofs in order of importance supports the objectives
identified in the Aviation Division's Strategy of operating a World Class International Airport
by: 
Ensuring safe and secure operations 
Meeting needs of our tenants, passengers and the region's economy 
Managing our assets to minimize the long-term total cost of ownership 
ALTERNATIVES CONSIDERED AND THEIR IMPLICATIONS: 
Alternative 1: C ontinue to patch and repair leaks, risking continued retrogressive deterioration
throughout the entire roof system. 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 could also increase the
Port's liability should customers slip and fall. This is not the recommended alternative. 
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, insects 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 Federal
Aviation Administration (FAA) approved Airport Certification Manual.  This is not the
recommended alternative. 
Some airports have begun to use green roof systems on new construction (thereby avoiding the
extensive redesign and structural strengthening retrofit issue for existing structures) using plants
that do not attract birds or wildlife. Staff has been in communication with Portland International
Airport (PDX) which has installed a green roofing system.  P DX's green roof system has
attracted insects  and birds, which conflicts with the requirements in the FAA's Airport
Certification Manual.

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
July 1, 2013 
Page 5 of 5 
Alternative 3: 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 second phase of the roof replacement
program has identified 70,100 square feet of roof on Concourse D. This phase is intended to be
designed in 2013 with construction to be accomplished in 2014. The rest of this prioritized
replacement program would be accomplished over the next five 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. 
OTHER DOCUMENTS ASSOCIATED WITH THIS REQUEST: 
Roof Replacement Planning Map. 
PowerPoint Presentation 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS: 
January 8, 2013  the Commission voted to authorize construction funds for the North
End Main terminal roof replacement. 
January 24, 2012  the Commission voted to authorize construction funds for the Fire
Station roof replacement. 
July 26, 2011  the Commission voted to approve design funds for the second phase of
the Airport re-roofing programs includes design of the Fire Station and North End Main
Terminal roofing systems. 
November 30, 2010  the Commission voted to authorize construction funds for the
first phase of the Airport Re-roofing program. 
April 27, 2010  the Commission voted to approve design funds for the first phase of
the Airport re-roofing program. 
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.