PORT OF SEATTLE 
MEMORANDUM 

COMMISSION AGENDA             Item No.      6c 
Date of Meeting    September 1, 2009 
DATE:    August 25, 2009 
TO:      Tay Yoshitani, Chief Executive Officer 
FROM:    Ralph Graves, Director, Capital Development Division 
Dwight Rives, General Manager, Port Construction Services 
Bob Riley, Director, Aviation Capital Improvement Program 
SUBJECT:  Modifications to the south Central Terminal grease duct system at Seattle-Tacoma
International Airport. 

REQUESTED ACTION 
Request Commission authorization for the Chief Executive Officer to approve the use of Port
crews for the major modification of the south Central Terminal grease duct system where the
estimated construction cost is $325,000. No additional budget is requested. The project
authorization of $511,000 will not change. The project continues to be an expense project paid
for by non-aeronautical revenues. The funding source is the Airport Development Fund.
SYNOPSIS 
On September 23, 2008, this project was previously authorized for the work to be performed by a
major construction contract with a total project estimated cost of $511,000. The project team has
determined it is advantageous to do the work by using Port Construction Services (PCS) crews.
The work requires great flexibility and coordination with the daily operation of the five food and
beverage concessionaires in the affected area. PCS is especially well suited and cost effective to
accomplish the work in this situation. The scope of work and total budget remain the same. The
scope of work includes resealing all joints on the horizontal ductwork, replacing damaged fire
protection blanket, removing unneeded and easily damaged fire sprinkler heads and installing
replacement access hatches. Commission authorization is required, in accordance with
Resolution 3605, Section 8.2, for utilization of Port crews when the estimated cost is more than
$200,000.
BACKGROUND 
The Commission authorized the repair of the leaking grease ducts on September 23, 2008.
During design the team had anticipated that rerouting new ductwork could be completed at less
cost than repair. This proved inaccurate as design proceeded and the estimated cost grew. At

COMMISSION AGENDA 
T. Yoshitani, Chief Executive Officer 
August 25, 2009 
Page 2 of 2 
that point, a repair method was proposed and a section of the ducts has been repaired and tested 
to demonstrate that the repair is feasible and effective. It has been determined that the best way
to accomplish the repair on the entire system is through the use of PCS crews. 
This request to repair the south Central Terminal grease duct system will ensure the safe
operation of concessions units, meet fire code requirements, improve operation and cleaning, as
well as limit on-going liability for damage to tenant units. It is important to complete the repairs
as soon as possible.
PROJECT SCHEDULE 
Construction is anticipated to start September 14, 2009 and complete by December 14, 2009.