PORT OF SEATTLE 
MEMORANDUM 
COMMISSION AGENDA               Item No.      4e 
ACTION ITEM 
Date of Meeting      May 12, 2015 
DATE:    May 4, 2015 
TO:      Ted Fick, Chief Executive Officer 
FROM:   Dave Soike, Director, Aviation Facilities and Capital Program 
Wayne Grotheer, Director, Aviation Project Management Group 
SUBJECT:  Domestic Piping Branch Replacement (CIP #800657) 

Amount of This Request:       $1,392,000   Source of Funds:  Airport Development
Fund (ADF) 
Est. Total Project Cost:          $1,950,000 
Est. State and Local Taxes:        $115,000 
ACTION REQUESTED 
Request Commission authorization for the Chief Executive Officer to advertise, bid and execute
a major works construction contract for the Domestic Piping Branch Replacement project at
Seattle-Tacoma International Airport. This authorization is for $1,392,000 of a total estimated
project cost of $1,950,000. 
SYNOPSIS 
This authorization would allow for the construction required to replace aging domestic water
pipes and associated valves in the Airport's Main Terminal. 
BACKGROUND 
There are four domestic water piping branches and manifolds in the Main Terminal, one serving
each mechanical room (rooms 1-4). These piping branches are approximately 43 years old.
During recent maintenance activities, portions of the piping were disassembled. The pipes were
found to be severely corroded, with the interior of pipes and fittings nearly completely plugged
with rust deposits. Also, many of the valves no longer function, leaving the Port vulnerable to a
water shutdown in the event of failure. 
PROJECT JUSTIFICATION AND DETAILS 
This request would authorize construction work for the replacement of the water pipes prior to
failure. Water pipes corrode through age and use. These pipes are over 40 years old and show
considerable corrosion. The disruption of domestic water supply in the event of failure would be
unacceptable to airport operations. 

Template revised May 30, 2013.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
May 4, 2015 
Page 2 of 5 
Construction will be performed by a major works contractor with support from Port maintenance
and Port Construction Services. 
Project Objectives 
Replace existing domestic water piping from the water main in the utilidor through the
reducing stations in Mechanical Rooms 1-4. 
Reduce risk of domestic water disruption to large portions of the Airport caused by pipe
or valve failure. 
Evaluate existing pipe sizes based on current demands and planned expansions and
resize piping as appropriate. 
Design and integrate domestic water metering into the existing Direct Digital Control
System. 
Replace existing valves that enable the Airport to shut down water in the event of an
emergency or for future work shutdowns. 
Minimize water supply disruption by performing root valve replacements overnight and
back feeding each mechanical room with water during construction to avoid outages. 
Scope of Work 
Replace four 6" and 8" domestic piping branches and associated sub-branches from the
12" main in the utilidor up to and including the reducing stations located near the
mechanical rooms in the Main Terminal; and 
Perform necessary work to keep the domestic water system functional through the
construction period. 
Schedule 
Project Notebook Approval                                3rd Quarter 2014 
Commission Authorization for Design                          4th Quarter 2014 
Design Start                                            4th Quarter 2014 
Design Completion                                   2nd Quarter 2015 
Commission Authorization for Construction                      2nd Quarter 2015 
Construction                          4th Quarter 2015 through 1st Quarter 2016 
FINANCIAL IMPLICATIONS 
Budget/Authorization Summary              Capital     Expense   Total Project 
Original Budget                      $1,950,000          $0    $1,950,000 
Previous Authorizations                  $558,000          $0     $558,000 
Current request for authorization            $1,392,000          $0    $1,392,000 
Total Authorizations, including this request     $1,950,000          $0    $1,950,000 
Remaining budget to be authorized               $0          $0          $0 
Total Estimated Project Cost              $1,950,000          $0    $1,950,000

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
May 4, 2015 
Page 3 of 5 
Project Cost Breakdown                     This Request       Total Project 
Design                                      $0          $558,000 
Construction                               $1,392,000         $1,392,000 
Total                                      $1,392,000         $1,950,000 
Budget Status and Source of Funds 
This project was included in the 2015-2019 capital budget and plan of finance with a budget of
$1,950,000. The funding source will be the Airport Development Fund. 
Financial Analysis and Summary 
CIP Category             Renewal/Enhancement 
Project Type              Renewal and Replacement 
Risk adjusted discount rate     N/A 
Key risk factors             N/A 
Project cost for analysis        $1,950,000 
Business Unit (BU)          Terminal cost center 
Effect on business performance  NOI after depreciation will increase 
IRR/NPV             N/A 
CPE Impact             CPE will increase by less than $.01 in 2017. This project 
was included in the business plan forecast. 
STRATEGIES AND OBJECTIVES 
This project supports the Port's Century Agenda objective of meeting the region's air
transportation needs at Sea-Tac Airport for the next 25 years. Maintaining our existing assets
and infrastructure is necessary to meeting this objective.
This project is not impacted by the airport's Sustainable Airport Master Plan. 
TRIPLE BOTTOM LINE 
Economic Development 
This project will allow the Port to continue providing Airport and concessions tenants with
uninterrupted domestic water. Completion of this project will significantly reduce the chances of
a domestic water outage and also prevent the economic impacts of an emergency repair project
and potential costs to tenants. 
Environmental Responsibility 
This project will provide the opportunity to apply environmental sustainability principles
primarily through the use of ductile iron pipe that has a high recycled content

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
May 4, 2015 
Page 4 of 5 
Community Benefits 
This project saves the Port the potential cost and operational impacts of a domestic water failure
that could take several months to correct.  Concessions and the traveling community will also
benefit by maintaining an uninterrupted water supply. 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
Alternative 1)  Status Quo. 
Capital Cost: $0; increased maintenance expense 
Pros: 
The Port could delay expenditure of the cost of pipe replacement, using the funds for
other purposes. 
Cons: 
Valves are already partially plugged and do not function. A more significant failure is
likely within the next two years.
Alternative 2)  Perform complete piping replacement of the entire main terminal. 
Cost: $8,203,000 
Pros: 
This option replaces all the corroded domestic water piping through the main terminal. 
Cons: 
This option is prohibitively expensive and does not take advantage of the efficiencies
gained by combining future plumbing repair into other upcoming construction that will
occur in the same locations.
Alternative 3)  Perform selective replacement where the problems are the worst - mechanical
rooms 1-4.
Cost: $1,950,000 
Pros: 
This option is a cost effective way to replace a major portion of the corroded domestic
water piping in the mechanical rooms and takes advantage of the efficiencies gained by
combining remaining piping replacement into upcoming work that will occur in the
same locations. 
Cons: 
This option does not replace all the domestic water piping that will eventually need to be
replaced. 
The recommendation is to pursue Alternative 3.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
May 4, 2015 
Page 5 of 5 
ATTACHMENTS TO THIS REQUEST 
Computer slide presentation. 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
November 4, 2014  Commission approved $558,000 for preparation of design and
construction contract documents.