PORT OF SEATTLE 
MEMORANDUM 
COMMISSION AGENDA               Item No.      6b 
ACTION ITEM 
Date of Meeting      May 26, 2015 
DATE:    May 19, 2015 
TO:      Ted Fick, Chief Executive Officer 
FROM:   Wayne Grotheer, Director, Aviation Project Management Group 
David Soike, Director, Aviation Facilities and Capital Program 
SUBJECT:  Concourse C Roof Replacement Project (CIP #C800702) 
Amount of This Request:         $874,000   Source of Funds:   Airport Development
Fund and Future
Est. Total Project Cost:          $5,596,000 
Bonds 
Est. State and Local Taxes:        $359,000 
ACTION REQUESTED 
Request Commission authorization for the Chief Executive Officer to execute a consultant
contract and prepare design and construction bid documents for  the replacement of the
Concourse C Roof at Seattle-Tacoma International Airport for an amount not to exceed $874,000 
of a total estimated project cost of $5,596,000. 
SYNOPSIS 
This project will remove and replace the current roofing system on Concourse C of the main
terminal building at the Airport. The portions of the terminal roof being replaced were installed
in 1991 and are beyond their useful life expectancy. Warranties on existing roofs have expired
and testing of roof membranes by Airport maintenance staff indicates the membranes are
deteriorating.
This project was included in the 2015-2019 capital budget and plan of finance with a budget of
$3,820,000.  At the completion of project definition, the cost estimate  was increased by
$1,776,000 to $5,596,000 for two reasons: 1) more skylight panels needing replacement, and 2)
the use of an outside design consultant. An on-site analysis completed during project definition
determined that 140 deteriorating skylight panels needed replacement, 100 more than first
assumed from a similar project on Concourse D. This increased costs by $1,511,000. Previous
projects were able to use an in-house expert to complete design. The use of an outside design
consultant rather than previously assumed in-house expertise for design has also increased costs 
by $265,000. 
This is the fifth project in a series of roofing projects that replace roofing systems in a sequence
that accomplishes the task in a prioritized manner over the next several years. Staff expects to

Template revised May 30, 2013.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
May 19, 2015 
Page 2 of 7 
seek Commission authorization next year for construction authorization of this Concourse C
roof. Next year staff also will request design authorization for the next roofing project, which
will be Concourse B. This will complete a majority of the re-roofing elements contained in the
original plan. 
BACKGROUND 
The first phase of the current cycle of completed roof replacements, which began in 2010,
included the south end of the Main Terminal in 2011. The second phase of the cycle included the
Fire Station in 2012 and the north end of the Main Terminal in 2013. The third phase of the cycle
of roof replacement projects at the Airport included the Concourse D roof, which was replaced in
2014. The fourth phase originally included some cargo and hanger buildings that may be affected
by the Sustainable Airport Master Plan (SAMP). As the Master Plan progresses, the scope and
timing of these projects will be re-evaluated. 
PROJECT JUSTIFICATION AND DETAILS 
Maintaining Airport roofing systems supports the Port's objective to provide safe and functional
facilities. As a critical system, the Concourse C roof must be replaced as it ages. The current
roofing system on Concourse C has reached the end of its dependable, leak-free, life span, with
several leaks occurring yearly. Between 2012 and 2014, more than 55 work orders were
generated requiring a maintenance response to resolve a roofing system leak. When new 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. This can result in customer
service impacts as portions of the facility become impaired while leaks are addressed. Slips and
falls as a result of water remaining on the walking surface can result in injuries to the traveling
public as well. Proceeding with replacement of the Concourse C 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 C of the Airport. 
Scope of Work 
Remove and replace the existing roof system on Concourse C at the Airport; install a new
elastomeric roofing system; ladders and fall protection; and replace and refurbish the existing
skylight window/walls. The Concourse C roof system is approximately 83,000 square feet.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
May 19, 2015 
Page 3 of 7 
Schedule 
Commission Authorization to Design:                       2nd Quarter 2015 
Commission Authorization for Construction:                    1st Quarter 2016 
Issue Notice to Proceed                                  2nd Quarter 2016 
Construction Complete                                4th Quarter 2016 
FINANCIAL IMPLICATIONS 
Budget/Authorization Summary              Capital     Expense   Total Project 
Original Budget                      $3,820,000          $0    $3,820,000 
Current Budget Increase                 $1,776,000               $1,776,000 
Revised Budget                     $5,596,000         $0    $5,596,000 
Previous Authorizations                   $25,000          $0      $25,000 
Current request for authorization              $849,000          $0      $849,000 
Total Authorizations, including this request      $874,000          $0      $874,000 
Remaining budget to be authorized         $4,697,000          $0    $4,697,000 
Total Estimated Project Cost              $5,596,000          $0    $5,596,000 
Project Cost Breakdown                     This Request       Total Project 
Design Phase                               $874,000          $874,000 
Construction Phase                                $0          $4,363,000 
State & Local Taxes (estimated)                        $0          $359,000 
Total                                       $874,000          $5,596,000 
Budget Status and Source of Funds 
The Concourse C Roof Replacement Project (CIP #C800702) is included in the 2015-2019
capital budget and plan of finance with a budget of $3,820,000. The project budget was increased
to $5,596,000 due primarily to the greater number of skylight panels that will now require
replacement rather than refurbishment as determined by a more detailed analysis completed in
the project definition phase of the project (from approximately 40 to more than 140). The use of
an outside design consultant rather than in-house design services has increased costs as well. The
budget increase will be transferred from the Aeronautical Allowance CIP (C800404) resulting in
no net change to the airport's capital budget.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
May 19, 2015 
Page 4 of 7 
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        $5,596,000 
Business Unit (BU)          Terminal 
Effect on business performance  NOI after depreciation will increase 
IRR/NPV             N/A 
CPE Impact             $.02 increase in 2017 
Lifecycle Cost and Savings 
The new roof system is not expected to have significant repair costs for the first 15 years. Preplanned
preventive maintenance tasks, and therefore costs, will be consistent with the current
maintenance program. Unplanned reactive maintenance call-outs, and those costs, to repair roof
leaks should decrease in future years. Unplanned responses to leaks on Concourse C have
resulted in approximately $48,000 in additional expense costs since 2012 for this current roofing
system. Without replacement, it is anticipated that these costs will climb over time. 
STRATEGIES AND 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
facilities to accommodate current as well as future airline tenants and needs. 
Replacing the most distressed Airport roofs in a timely fashion as they deteriorate supports the
objectives identified in the Aviation Division's Strategy of operating a World Class International
Airport by: ensuring safe and secure operation; meeting the needs of our tenants and the region's
economy; and managing our assets to minimize the long-term total cost of ownership. 
The Project Manager and the Office of Social Responsibility will work together to maximize
small business opportunities for this project. 
TRIPLE BOTTOM LINE 
Economic Development 
This roof replacement project represents an investment in our current facilities and supports the
long-term vitality of the Airport, airlines and Airport tenants. 
Environmental Responsibility 
The new roof systems will have a solar reflective index that exceeds .80. This index level is an
industry standard for white reflective roofing systems and the value required to obtain the
Leadership in Energy & Environmental Design (LEED) new construction Credit 7.2. The new

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
May 19, 2015 
Page 5 of 7 
roofing systems will also be Energy Star rated. The insulating value of the new roof systems will
be greater than that of the existing roofing systems. By replacing the roof systems and preventing
damage to the underlying building systems, the life of the existing building systems will be
prolonged. Roof materials may be sourced locally from the Pacific Northwest. Roofing systems
replaced will use materials exceeding LEED requirements. Opportunities will also be
investigated to recycle the existing roof and associated components. 
Community Benefits 
Replacing the roofing systems will prevent water leak damage to other building systems, prevent
disruption of Airport operations, and improve customer service. 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
Alternative 1)  Continue to patch and repair the leaks. 
Total Cost: The average cost per year over the last three years for all C Concourse leak activity
was approximately $23,000. Repair costs can vary widely however, depending on the failure
mode, and are difficult to predict. This is a short-term strategy only. The eventual failure of the
roof would severely impact the building, its occupants, and airport operations. 
Pros:
Defers capital costs to a later date and allows funds to be used for other purposes. 
Cons: 
Risk continued retrogressive deterioration throughout the roof system.
The number and frequency of leaks will increase causing customer service problems. 
This alternative increases maintenance and emergency repair response and costs, due to
the continual patching of the exiting roof system, and possible ceiling, floor, and
equipment damage caused by the leaks. 
This also increases potential liability should passengers slip and fall. 
The Concourse C roof has deteriorated to the point where with each new rainy season, 
new leaks are encountered. Maintenance responds and attempts to assess and mitigate the
leaks. In this reactive state however, customer service is negatively impacted. 
This alternative would lead to conditions the tenants would not find acceptable or meet
the terms of the leases. 
Indefinite deferral leads to the risk of catastrophic failure. 
Deferring the project results in the risk of price escalation. Volatility of commodity
pricing can result in fairly large swings, year to year in material costs in this type of
construction. 
This is not the recommended alternative. 
Alternative 2)  Install a roofing system with a very long life - 30 years or longer.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
May 19, 2015 
Page 6 of 7 
Capital cost: $6,160,000 (30 year roofing only. No structural increases have been determined.) 
Pros:
A roofing system with a longer life would require fewer replacements for a given period
of time. 
Cons: 
During the next 30 years as air traffic continues to rise there is potential that the footprint
of Concourse C will change requiring the roof to be replaced or modified. Thus the Port
would not likely see the benefit of a longer life roofing system. 
A roofing system with a longer life (50 year) would require significantly more structure
be added to support the system and increase the capital construction cost a minimum of
two times over the cost to roof with an elastomeric roofing system.
This is not the recommended alternative. 
Alternative 3)  Replace the roofing system using an elastomeric roofing system with a 15 year
warranty. 
Capital cost: $5,596,000 
Pros: 
Allows the Port to provide safe and functional facilities. 
Roofs are critical systems to the integrity of the buildings. The roofing system being
replaced has reached the end of its dependable leak-free life span.
Reduces the risk of creating emergency hazardous situations where leaks increase in
number and frequency. 
Avoid the risk of unknown price escalation in future years. 
Supports the known purpose for the Concourse while avoiding longer life systems that
may or may not remain in place in the future. Limits the exposure to demolishing an asset
that still has useful life. 
Cons: 
Requires capital spending now. 
This is the recommended alternative. 
ATTACHMENTS TO THIS REQUEST 
Computer slide presentation of the Airport Roof Map

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
May 19, 2015 
Page 7 of 7 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
June 10, 2014  the Commission authorized design funds for the 2014-2015 Roof
Replacement project. 
April 1, 2014   the Commission authorized a budget increase of $219,000 and
execution of a major public works construction contract with the low responsive and
responsible bidder for the Concourse D roof replacement. 
January 28, 2014  the Commission authorized construction funds for the Concourse D
roof replacement. 
July 9, 2013  the Commission authorized construction funds for the North End Main
terminal roof replacement. 
January 24, 2013  the Commission authorized construction funds for the Fire Station
roof replacement. 
July 26, 2011  the Commission authorized design funds for the second phase of the
Airport re-roofing program including design of the Fire Station and North End Main
Terminal roofing systems. 
November 30, 2010  the Commission authorized construction funds for the South End
Main terminal roof replacement. 
April 27, 2010  the Commission approved design funds for the South End Main
terminal roof replacement. 
September 22, 2009  the Commission was briefed on the facility renewal project that
was necessary in future years. The Airport re-roofing program was included in the
presentation.