COMMISSION 
AGENDA MEMORANDUM                Item No.       4d 
ACTION ITEM                   Date of Meeting     July 11, 2017 
DATE:    June 23, 2017 
TO:     David Soike, Interim Executive Director 
FROM:   Ralph Graves, Senior Director, Capital Development 
Janice Zahn, Assistant Engineering Director, Construction Services 
SUBJECT:  Concourse B 400Hz Gate Improvements Project  Change Order 12 
Amount of this request:                $0 
Total estimated project cost:      $17,234,282 
ACTION REQUESTED 
Request Commission authorization for the Executive Director to execute Change Order 12 to 
Contract MC-0318388, Concourse B  400Hz Gate Improvement  Project  at Seattle-Tacoma
International Airport, to extend the contract duration by 64 calendar days and for the amount
of $186,068. No additional funds are being requested. 
EXECUTIVE SUMMARY 
The gates on Concourse B are the only remaining aircraft gates that require 400Hz electrical
connection upgrades. Upon project completion, the aircraft that use these gates will be able to
plug in to the terminal rather than burning fossil fuel to power the aircraft auxiliary jet engine
that, in turn, powers the flight deck controls. 
A previous Commission action authorized a $500,000 budget transfer from the Concourse B
Gate Reconfiguration project (CIP #C800873) to the Concourse B 400 Hertz Upgrade project
(CIP #C800019) and authorized execution of a change order for up to $500,000. This transfer
was the result of an agreement between the Port and Delta Air Lines for the design and
construction of two new passenger boarding gates and the reconfiguration of four existing
gates on Concourse B. These gates were not in the original scope of work of the 400Hz project. 
Staff and the contractor have completed the negotiation for this additional scope of work for an
additional cost of $186,068. This commission action requests approval to grant 64 days of 
contract time extension to complete this additional work that was not addressed in the original
Commission request for change order.
JUSTIFICATION 
Due to an agreement between the Port and Delta Airlines, new gates were added to Concourse
B which were not included in the original scope of the 400Hz project. In order to provide

Template revised September 22, 2016.

COMMISSION AGENDA  Action Item No. 4d                       Page 2 of 3 
Meeting Date: July 11, 2017 
electric power to these additional gates, the Commission authorized the Concourse B 400Hz
project to execute a construction contract change order for up to $500,000 to cover costs for
design and construction of the work associated with six Delta gates on Concourse B (two new
gates and modifications to four existing gates). The previous Commission action occurred on
October 25, 2016 in item 6b but that action did not include approval for an extension to
contract time. 
DETAILS 
Two added gates and four reconfigured gates will provide additional capacity and flexibility for
up to six narrow-body aircraft to park at these same gates when wide-body operations are not
required. 
Scope of Work 
The scope of work for this change order is to add new 400Hz ground electrical power to
accommodate additional aircraft operations at two additional gates and four reconfigured
gates on B Concourse. The original scope of work for the project added 400Hz power to the
existing gates. 
Schedule 
Activity 
Commission design authorization          2014 Quarter 4 
Design start                          2014 Quarter 4 
Commission construction authorization       2016 Quarter 4 
Construction start                      2017 Quarter 1 
In-use date                          2017 Quarter 3 
Contract Cost Breakdown              Total 
Original Contract Amount              $ 2,999,000 
Executed Change Orders 1-11            $ 49,829 
Current Bid item Adjustments            $ 0 
Current Contract Amount              $ 3,048,829 
Change Order #12                  $ 186,068 
Revised Contract Amount (through CO #12)   $ 3,048,829 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
Alternative 1  Do not authorize the added contract time. Thecontractor would be forced to 
pursue a contract time extension through our Dispute Resolution Process. 
This is not the recommended alternative. 

This version as revised 9/16/2016

COMMISSION AGENDA  Action Item No. 4d                       Page 3 of 3 
Meeting Date: July 11, 2017 
Alternative 2  Authorize the issuance of Change Order #12 for the amount of $186,068 and 64 
calendar days to add 400Hz power to six additional gates.
Cost Implications: None.  This is a full and final change order for additional contract cost and
time associated with this scope of work. 
This is the recommended alternative. 
FINANCIAL IMPLICATIONS 
There is no additional funding being requested in this memo. The project has adequate funds
to cover this request. 
ATTACHMENTS TO THIS REQUEST 
None 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
October 25, 2016  The Commission authorized a $500,000 budget transfer from the Concourse
B Gate Reconfiguration project (CIP #C800873) to the Concourse B 400 Hertz Upgrade project
(CIP #C800019). 
December 2, 2015  The Commission authorized the advertisement, award, and execution of a
major construction contract for the Concourse B gates not to exceed $3,567,282. 
December 1, 2014  The Commission authorized the restart for the design of the Concourse B
400Hz Gate Improvements project. 
December 4, 2012  The Commission authorized the advertisement, award, and execution of a
major construction contract not to exceed $8,242,000. 
March 6, 2012  The Commission authorized $328,000 expense funding to CIP 800019. 
October 11, 2011  The Commission authorized a major construction contract in the amount of
$6,144,000 of the authorized $12,883,000. 
June 14, 2011  The Commission authorized an additional $3,489,000 to CIP 800019 increasing
the total project budget to $12,883,000. 
June 28, 2007  The Commission authorized $9,385,000 (CIP 800019) to replace the 400Hz
Ground Power Systems at the South Satellite and Concourse B plus upgrade 29 gates with
400Hz equipment and Potable Water Cabinets. 
December 10, 2002  The Commission authorized $2,614,000 (CIP 102102) to replace and
upgrade the 400Hz Ground Power system at the North Satellite. 



This version as revised 9/16/2016