PORT OF SEATTLE 
MEMORANDUM 
COMMISSION AGENDA             Item No.      6d 
ACTION ITEM             Date of Meeting    May 28, 2013 
DATE:    May 21, 2013 
TO:     Tay Yoshitani, Chief Executive Officer 
FROM:    Ralph Graves, Managing Director, Capital Development 
Janice Zahn, Assistant Engineering Director 
SUBJECT:  Centralized Pre-Conditioned Air Project at Seattle-Tacoma International Airport 
MC-0316677
Amount of This Request:    $0.00         Total Project Cost: $47,225,000 
Source of Funds: Project Contingency and Airport Development Fund 
Est. State and Local Taxes: $3,194,212.08     Total Contract Cost: $36,817,497.08 

ACTION REQUESTED:
Request Commission authorization for the Chief Executive Officer to issue Change Order
No. 166 for Contract MC-0316677, Centralized Pre-Conditioned Air (PC Air) Project at Seattle-
Tacoma International Airport to add 221 days to the contract duration for a new contract
completion date of August 26, 2013. 
SYNOPSIS:
On September 13, 2010, the Port executed a construction contract for PC Air to Lydig
Construction. During construction, the contractor identified many obstructions to the pipe
routing for Concourse D that were not addressed within the contract documents. In previous
Commission actions, Change Orders No. 113 and 121 were issued for the required modifications
for the combined amount of $1,121,468. At that time, it was not known what the impact would
be to the project schedule. A schedule analysis, completed jointly by the Port and the contractor, 
acknowledge that the project schedule has been impacted by 221 days as a result of the needed
design changes. A change order is required to extend the contract time so that the contract end
date may be enforced and Port staff may begin to negotiate the indirect costs associated with this
extension. 
This is a no-cost change order. However, this change order does not address the associated
indirect costs that may be related to this contract extension. Until the Port has fully evaluated
and determined any shared delays associated with completing this work, it is not possible to

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
May 21, 2013 
Page 2 of 5 
finalize and resolve the extended overhead and other costs associated with this change order. As
those costs are resolved, they will be addressed by separate change orders. If required, staff will
return to Commission at a later date for additional authorization. 

BACKGROUND: 
The Centralized Preconditioned Air project is a very large and complex project that benefits
airlines and travelers. Regardless of the outside weather conditions, a traveler expects the
temperature of the inside of an aircraft to be a comfortable 68 to 70 degrees. Generally, an
airplane is able to set the right temperature inside by running an auxiliary jet. To properly
condition the inside of that airplane cabin, that auxiliary engine is burning fossil jet fuel. If all
the jet auxiliary engines across all gates are considered, the carbon dioxide generated over a year
equates to about 13,000 cars on the road. The estimated amount of jet fuel burned is about 5
million gallons per year. 
Instead of burning fossil fuel, the preconditioned air project is a system of chillers, heaters, and
pipes that will provide both the heating and cooling to the aircraft from a central plant at the
airport. The airport central plant can more effectively keep the airplane at a comfortable
temperature when it is at any one of SeaTac's gates. The flight crews can turn off aircraft
auxiliary engines and plug in at the gate to receive both heated and cooled air. 
This will lower costs to the airlines while producing significant environmental benefits by
reducing the release of tens of thousands of tons of carbon dioxide (CO2) emissions each year.
This project is a cost-effective way to aid the airlines while improving the quality of the
environment. While the airlines have approved funding for this project, a Federal Aviation
Administration (FAA) Voluntary Airport Low Emission (VALE) grant was obtained for this
project. The FAA provided $21,912,679 in grants for this project. 
The most challenging part of building this project has been the piping installation. Conditioned
(chilled and heated) glycol is circulated in these pipes from a central location to every aircraft
gate. The jet passenger loading bridge structure is used as the final link to provide warm or
cooled air to the airplane passenger cabin. The glycol piping is large (6", 8" and 10" in
diameter) and because it is full of liquid, it is very heavy. It is hung from large hangers that
penetrate walls, is supported by structural beams and columns across the varying concourses, and
has to run for miles across building walls and roofs. This project includes the installation of 15
miles of piping within our existing terminals and going to each jet doorway at 73 gates. 
Accessing various parts of the airport to install pipe have required relocating existing utilities and
equipment while scheduling work to minimize operational impacts. Detailed investigations
during design were not practical within the manyh of the occupied areas. The design phase was
also negatively impacted by the grant funding deadline to get the project under construction
contract.

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
May 21, 2013 
Page 3 of 5 

Lydig Construction was the low bidder with contract execution on September 13, 2010. The
original contract completion date was December 12, 2012. There has been one 37-day contract
extension granted, extending the current contract completion date to January 17, 2013. The new
contract completion date will be August 26, 2013. 
The project budget, including the FAA grants, has increased from $40,600,000 to $47,225,000.
The budget increase has paid for change orders, added to construction contingency for potential
change orders, covered additional consulting costs, and covered additional Port crew costs. The
change orders have been due to design errors or omissions due to a rushed design period, access
challenges for piping installation, resolution of conflicts & interferences for piping installation
given existing conditions, revisions in building & electrical codes, and changes in Port
requirements since the project was bid. The Port incurred additional costs to review these change
orders and to resolve design issues during construction. Additional Port crew costs were also
expended to open and close ceilings and walls in occupied areas, shutdown utilities during
construction, and test equipment following construction. 
Despite the design and contracting challenges, the project team expects the system to start
operating this summer. 
CHANGE ORDER DESCRIPTION: 
The following information relates to the pending change order scope and cost: 
Change Order No. 166 
Scope of work: The Contract Duration will be extended by 221 days to 1,078 days resulting
from delays due to the piping redesign on Concourse D. The Contract Completion date will now
be August 26, 2013. 
JUSTIFICATION: 
Subsequent to the execution of the construction contract, it was discovered that the designed
routing did not include enough information for the contractor to properly perform the work. This
included interferences where the pipe was to be installed along with missing building details.
Working collaboratively with the contractor, Port staff and the design consultant agreed upon a
new route. However , omissions in the design regarding building expansion joints required the
addition of numerous pipe expansion joints and associated appurtenances that were not in the
original bid documents. This routing constitutes the lowest cost and impact option to the project
to complete pipe routing on Concourse D, which ultimately feeds the North Satellite as well.
Although the direct costs have been addressed via previously issued change orders, subsequent
schedule analysis has determined the impact to the critical path of the project. This change order
only addresses the time impact as a result of these changes.

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
May 21, 2013 
Page 4 of 5 
CONTRACT INFORMATION: 
The following information relates to the contract and competitive award: 
Contract award date:                         September 13, 2010 
Original period of performance:    September 13, 2010  December 12, 2012 
Previous contract extensions:                            37 Days 
Contract extension this change order:                      221 Days 
Current Contract Completion Date:                  August 26, 2013 
FINANCIAL INFORMATION: 
Original contract amount:                        $27,013,400.00 
Previous Change Orders Executed:                   $6,609,885.00 
Current contract amount                         $33,623,285.00 
This request, Change Order No. 166                        $0.00 
Subtotal Construction Costs                       $33,623,285.00 
Anticipated sales tax @ 9.5%                       $3,194,212.08 
Revised Contract Amount                       $36,817,497.08 
OTHER DOCUMENTS ASSOCIATED WITH THIS REQUEST: 
PC Air Construction Photos (Powerpoint) 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS: 
On November 7, 2012, the Commission authorized a budget increase of $1,100,000 to replenish
construction contingency due to disputed costs. Additionally, the Commission authorized the
execution of Change Order No. 121 in the amount of $344,558 to resolve the remaining disputed
costs related to Change Order No. 113 due to changes in the routing of PC Air piping at
Concourse D. 
On October 2, 2012, the Commission authorized a budget increase of $2,000,000 to cover
additional costs related to construction, design support, and Port Construction Services and Port
Maintenance support for the project. Additionally, the Commission authorized the execution of
Change Order 119 in the amount of $509,013 for additional costs related to the North Satellite
Tunnel pipe routing.

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
May 21, 2013 
Page 5 of 5 
On September 27, 2011, the Commission authorized a budget increase $3,525,000 to cover
additional costs to the construction budget, outside professional services and project management
soft costs. Total project funding authorization increased to $44,125,000. 
On September 11, 2012, the Commission authorized execution of Change Order 113 in the
amount of $776,910 for changes to the pipe routing at Concourse D. Total project funding
authorization remained at $40,600,000. 
On May 24, 2011, the Commission authorized execution of a $400,000 amendment to the
professional service agreement with Stantec Consulting. Total project funding authorization
remained at $40,600,000. 
On May 11, 2010, the Commission authorized staff to advertise for bids, apply a Project Labor
Agreement (PLA), and authorize Port Construction Services to perform pre-construction work,
including moving tenants, for Phase I and Phase II of the PC Air Project (CIP # C800238) at the
Airport and execute a construction contract. This authorization was for $36,830,000. The
estimated total project cost is $40,600,000. 
On January 13, 2009, the Commission authorized procurement and execution of service
agreements with consultants to perform design, prepare contract documents, and perform
contract administration for the Pre-Conditioned Air project at Seattle-Tacoma International
Airport in the amount of $3,770,000.