PORT OF SEATTLE 
MEMORANDUM 
COMMISSION AGENDA             Item No.      5f 
Action Item                       Date of Meeting   February 26, 2013 

DATE:    February 8, 2012 
TO:      Tay Yoshitani, Chief Executive Officer 
FROM:    Ralph Graves, Managing Director, Capital Development Division 
Janice Zahn, Assistant Engineering Director, Construction 
SUBJECT:  Change Order #19 for the 2011 AIP Pond M Mod & SDS 6/7 Vault Mod Contract
3, Contract MC-0316896 
Amount of This Request: $0.00   Total Project Cost: $1,882,849.00 
Source of Funds: Project Construction Contingency. No additional funds requested. 
Est. State and Local Taxes: $178,871.00           Jobs Created: 0 
ACTION REQUESTED:
Request Commission authorization for the Chief Executive Officer to issue Change Order #19
for an 85 day non-compensable time extension to December 16, 2011, for the 2011 AIP Pond M
Mod & SDS 6/7 Vault Mod Contract 3 (Pond M) project. 
SYNOPSIS:
The Pond M project started on May 5, 2011, and was scheduled to complete on September 22,
2011. Various issues contributed to a late project substantial completion date of December 16,
2011. As a result of differing site conditions encountered in the excavation area, the contractor
filed a claim resulting in a formal mediation hearing held on January 9, 2013. The result of the
hearing was a Dispute Resolution Agreement settling all outstanding issues on the project. 
Change Order #18 was issued previously for $237,500 which settled all cost issues. The
issuance of this Change Order reconciles the Contract duration with the actual Contract end date
per the Dispute Resolution Agreement. 
BACKGROUND: 
Pond M is one of several stormwater projects that were required to fulfill Third Runway
environmental permit obligations. Completion of Pond M stormwater detention satisfies the
outstanding permit requirements and in doing so provide flow control and additional water
quality treatment for approximately 160 acres of Airport surfaces draining to Miller Creek.
The construction contract was awarded to Northwest Construction, Inc. on May 5, 2011.
Construction commenced with the issuance of Notice to Proceed on June 3, 2011. Beneficial
Occupancy of Pond M was issued on October 7, 2011 and Substantial Completion of the project
Work on December 16, 2011.

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
February 8, 2013 
Page 2 of 3 

This change order is being issued to address the 85 additional days that were required to achieve
substantial completion.
FINANCIAL ANALYSIS: 
The change order is at no cost. No additional project funds are being requested as a result of this
change order. 
CONTRACT INFORMATION: 
The following information relates to the contract and competitive award: 
Contract award date:                              May 5, 2011 
Original period of performance:    May 5, 2011 through September 22, 2011 
Previous contract extensions:                             0 Days 
Contract extension this change order:                       85 Days 
Current Contract Completion Date:                December 16, 2011 
FINANCIAL INFORMATION: 
Original contract amount:                           $1,787,512 
Previous Change Orders Executed:                      $290,467 
Current contract amount                            $2,077,979 
This request, Change Order No. 19                           $0 
Subtotal Construction Costs                         $1,882,849 
Anticipated WSST @ 9.5%                        $178,871 
Revised Contract Amount                         $2,061,719 
PREVIOUS COMMISSION ACTION: 
On August 1, 1996, the Commission adopted Port Resolution No. 3212, as Amended, approving
the Master Plan Update for Airport, including development of a new dependent air carrier
runway, and authorizing initial development work for the Runway project. 
On May 27, 1997, the Commission authorized $587,362,000 for completion of the Runway
project to be completed by 2004. 
On June 22, 1999, the Commission authorized an additional $186,000,000, increasing the total
authorization to $773,362,000. At that time, it was estimated permitting would be finalized by
December 1999 and the Runway project would be complete by fall 2006. 
On June 24, 2003, the Commission was briefed on additional costs from delays, permit
conditions, market conditions, scope of project, and FAA requirements. At that time, the
Runway project was scheduled to be completed at the end of 2008.

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
February 8, 2013 
Page 3 of 3 
On October 11, 2005, the Commission authorized an additional $125,000,000 increasing the total
authorization to $898,362,000. 
On September 26, 2006, the Commission authorized an additional $219,594,000 increasing the
total authorization to $1,128,956,000. 
On April 21, 2009, the Commission authorized the advertisement for construction bids for the
Lora Lake Demolition, Des Moines Nursery Mitigation and the Third Runway Stormwater Pond
Projects. 
On July 28, 2009, the Commission authorized design for Miller Creek Relocation Revisions,
160th Street Culvert Removal, and Third Runway Environmental Mitigation at Seattle-Tacoma
International Airport. 
On January 12, 2010, the Commission authorized the advertisement for construction bids for
Third Runway Mitigation, including Miller Creek Relocation Revisions and Restoration; 160th 
Street Bridge/Culvert Removal; and Third Runway Permanent Stormwater Detention Facility at
the Airport. 
On June 1, 2010, the Commission authorized the separation of Stormwater Retention Pond M
(Pond M) from the other 2010 Airfield Improvement Projects  Contract 2 (AIP-2) and delay
construction until 2011. 
On March 1, 2011, the Commission authorized authorized the advertisement and execution of a
construction contract for 2011 AIP Pond M Mod & SDS 6/7 Vault Mod Contract 3 (Pond M)
project. 
OTHER DOCUMENTS ASSOCIATED WITH THIS REQUEST: 
None.