PORT OF SEATTLE 
MEMORANDUM 
COMMISSION AGENDA               Item No.      4c 
ACTION ITEM 
Date of Meeting     March 8, 2016 
DATE:    February 29, 2016 
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:        $5,047,000   Source of Funds:  Airport Development
Fund and Existing
Est. Total Project Cost:          $5,921,000 
Revenue Bonds 
Est. State and Local Taxes:        $419,000 
ACTION REQUESTED 
Request Commission authorization for the Chief Executive Officer to advertise and execute a
contract to construct the Concourse C Roof Replacement project at Seattle-Tacoma International
Airport for an amount not to exceed $5,047,000 of a total estimated project cost of $5,921,000. 
SYNOPSIS 
This project will remove and replace the current roofing system on Concourse C at the Airport.
The portions of the Concourse C roof being replaced were installed in 1991 and are beyond their
useful life expectancy. Warranties on existing roof system have expired and testing of roof
membranes by Airport maintenance staff indicates the membranes are deteriorating. 
Replacing the roof helps to assure a stronger positive customer experience and avoids potential
safety issues and concourse closures that can occur with roof leaks. Replacing the roof supports
the Airport Division's Strategy of Operating a World Class Airport. This is the fifth project in a
series of roofing projects that replace roofing systems in a prioritized sequence. The current
project budget increased during design by $325,000 to $5,921,000. This increase is a result of
code requirements determined in design. 
BACKGROUND 
The first phase of the current cycle of roof replacement projects re-roofed the south end of the
Main Terminal in 2011. The second phase re-roofed the Fire Station in 2012 and the north end of
the Main Terminal in 2013. The third phase replaced the Concourse D roof in 2014. The fourth
phase will replace the Alaska Hangar One and associated maintenance building roof this summer
along with this project, the fifth phase of roof replacements, which is also scheduled for this
summer. The Concourse B roof would follow in the summer of 2017. 

Template revised May 30, 2013.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
February 29, 2016 
Page 2 of 6 

PROJECT JUSTIFICATION AND DETAILS 
The Concourse C roof, similar to other critical systems, must be replaced as it ages and
deteriorates. The current roofing system on Concourse C is 25 years old and has reached the end
of its  dependable leak-free lifespan. Because the roofs are exposed to the elements and
experience wear and tear, when they fail the risk to the traveling public increases, and the safe
availability of the facility becomes impaired. In order to provide a leak free terminal
environment and safe experience for those who travel through and work in the facility,
Concourse C roof has been identified as the next roof to be replaced. 
The recommended replacement age for this type of roof is between 15-20 years. The warranties
have expired which puts the roof beyond the industry standard life expectancy. While the
existing roof is leaking, those leaks are considered relatively minor at this time. They are
however leading indicators for more significant leakage in the future. Roof leaks enter the
interstitial space (between the roof and the ceiling) on Concourse C. In the interstitial space
much of the mechanical and electrical infrastructure serving Concourse C is housed. Damage to
this underlying infrastructure will take place, and as a result, the renewal and replacement costs
will grow as well. Deferring this project until significant leakage occurs does not align with the
strategy to minimize long-term total cost of ownership. 
As leaks occur there is the potential for leaking water to enter the public spaces, and place both
tenants and passengers at risk of slips and falls. When leaks occur, the Airport secures the
portion of the concourse  where the leaks are occurring during wet weather events  as a
preventative measure. This however, is contrary to  the Port's strategy of anticipating and
meeting the needs of our customers, as this action would take portions of the concourse out of
service during a time of increased usage and gate shortages. 
Project Objectives 
This project will replace the existing roof system on Concourse C at the Airport. 
Scope of Work 
Replace the existing roof system on Concourse C; install a new elastomeric roofing system; 
install ladders and fall protection; and replace and refurbish the existing Kalwall skylight
window/walls. 
Schedule 
Commission Authorization for Construction:                   1st Quarter 2016 
Issue Notice to Proceed                                  2nd Quarter 2016 
Construction Complete                                4th Quarter 2016

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
February 29, 2016 
Page 3 of 6 
FINANCIAL IMPLICATIONS 
Budget/Authorization Summary              Capital     Expense   Total Project 
Original Budget                      $3,820,000          $0    $3,820,000 
Previous Budget Increases                $1,776,000          $0    $1,776,000 
Current Budget Increase                  $325,000          $0     $325,000 
Revised Budget                     $5,921,000         $0    $5,921,000 
Previous Authorizations                  $874,000          $0     $874,000 
Current request for authorization            $5,047,000          $0    $5,047,000 
Total Authorizations, including this request     $5,921,000          $0    $5,921,000 
Remaining budget to be authorized                $0          $0          $0 
Total Estimated Project Cost               $5,921,000          $0    $5,921,000 
Project Cost Breakdown                     This Request       Total Project 
Design Phase                                  $0          $874,000 
Construction Phase                          $4,628,000         $4,628,000 
Sales Tax                                  $419,000          $419,000 
Total                                      $5,047,000         $5,921,000 
Budget Status and Source of Funds 
The Concourse C Roof Replacement Project (CIP #C800702) is included in the 2016-2020
capital budget and plan of finance with a budget of $5,596,000. The first project budget increase
(during design authorization) covered an increase in scope due to added skylight replacement.
The current project budget increased during design by $352,000 due to code requirements
determined late in design. This budget increase will be transferred from the Aeronautical
Allowances CIP (C800404) resulting in not net change to the airport's capital budget. The
funding sources will include the Airport Development Fund and existing revenue bonds. 
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        $5,921,000 
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 maintenance costs, will be consistent with

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
February 29, 2016 
Page 4 of 6 
the current maintenance program. Unplanned reactive maintenance call-outs, and those 
associated costs to repair roof leaks are expected to be avoided in future years. Unplanned
responses to leaks on Concourse C have resulted in approximately $73,000 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 tenant needs. 
Replacing the most distressed Airport roofs in a timely manner 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 determined a 5% SCS requirement
for this project. 
Environmental Responsibility 
The new roof system 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
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 system. 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. Opportunities will
also be investigated to recycle the existing roof and associated components. 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
Alternative 1) Status Quo  Delay replacement of the Concourse C roof. 
Cost Estimate: $25,000-$50,000 potential ongoing annual expense cost per year for major
repairs. 
Pros: 
No capital funding required. Leaves capital funds available for other projects. 
Cons: 
Will likely increase maintenance and emergency repair response over time. 
The cost of a future roofing project in the event of roof failure would be the full cost of
replacement ($5.6 million) plus escalation and the cumulative on going expense costs. 
Risk cost of lost terminal space due to emergency repairs  unknown but high. 
Increases the chances that the interior of the facility will be damaged due to water
infiltration.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
February 29, 2016 
Page 5 of 6 
Damage to the interior of the facility would affect customer service. 
Safety of the public could be compromised due to the slip hazard to traveling public and
employees. 
The risk of significant or catastrophic failure increases over time with the further
breakdown of roof system materials. 
Indefinite deferral leads to the risk of catastrophic failure. 
This is not the recommended alternative. 
Alternative 2) Replace the Concourse C roofing system with a system that could last up to 30
years. 
Capital Costs: Estimated $9.8 Million 
Pros: 
Helps to assure a stronger positive customer experience and avoids potential safety
hazards and concourse closures. 
Provides protection of port assets. 
Avoids the need for a future renewal and replacement project that will be disruptive to
the terminal operation at the 15 year mark. 
Cons: 
Based on the age of the concourse, the existing infrastructure, and the current building
configuration it is expected that the concourse configuration may change significantly at
a future date before the end of the useful life for a 30 year roof. 
Due to the added material cost, handling cost, and structural design considerations to
strengthen ceiling framing, this is the most expensive alternative. 
This alternative would require a re-engineering of the project, delaying construction
approximately one year. 
This is not the recommended alternative. 
Alternative 3) Replace Existing Roof with a 15 year roofing system. 
Capital Costs: $5,921,000 
Pros: 
Provides for the viability of the facility for the foreseeable future. 
Based on information from planning staff, this building will not be affected by the SAMP
for the 15 year life of the roof. 
This project would provide for a warranted roof that will minimize the cost of roof
repairs going forward for the foreseeable life of the roof. 
Helps to assure a stronger positive customer experience and avoids potential safety
hazards and concourse closures. 
Provides protection of port assets. This option does the best job of supporting the goal of
managing Port assets to minimize the long term total cost of ownership.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
February 29, 2016 
Page 6 of 6 
Cons: 
This project would consume capital funds that could possibly be utilized on other
projects. 
This is the recommended alternative. 
ATTACHMENTS TO THIS REQUEST 
Computer slide presentation of the Airport Roof Map. 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
February 9, 2016  the Commission authorized construction funds for the 2014-2015
Roof replacement. 
May 19, 2015  the Commission authorized design funds for the Concourse C roof
replacement. 
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 design funds for the Concourse D roof
replacement. 
January 8, 2013  the commission authorized construction funds for the North End
Main terminal roof replacement. 
January 24, 2012  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 roof replacements. 
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.