- P.0. Box 1209
POrt_
Seattle, WA 98111-1209
of Seattle'                              Tel: (206) 737-3000

November 1, 2016

Joelle Briggs
Manager, Seattle Airports District Ofce
Federal Aviation Administration
1601 Lind Avenue SW
Renton, Washington 98057

Dear Ms. Briggs,

Beginning in late 2015 and throughout 2016, Airfield Operations staff at Sea-Tac Airport has kept FAA
personnel informed regarding our obstruction mitigation program, in joint Port/FAA Sea-Tac Airport
Integration Team meetings and Strategic Planning Team meetings. We have appreciated the informal
guidance and discussion around our methodology, survey and proposed plan for moving forward.

At this time, I would like to provide more specic information from the results of our survey and
our draft
implementation plan, and would appreciate any comments you might provide. We are proposing a three-
year plan to remove obstructions, clear and replant with lower-height species. As noted in the attached
implementation plan, we are proposing to conduct the work rst on Port-owned property, then on other
publicly owned property, and nally on privately-owned commercial and residential properties.

This phased plan is to address the number of vegetative obstructions which have developed since the
obstruction removal survey work was last conducted in the mid-2000's, to mitigate the impact of
removing a high number of full-size trees, and to improve the urban forest and understory on these sites.

Thank you for your time and attention to this matter, and I look forward to your comments.
Sincergl-E,
Lance Lyttle
Managing Director
Seattle-Tacoma International Airpon

Attachment:
Implementation Plan, Seattle-Tacoma International Airport  Flight Corridor Safety Program, inc. Table
2.1 Obstruction Removal Summa by Location Anchor QEA, April 2016

Cc:   Jason Ritchie, Assistant Manager, Seattle Airports District Office
Michael Ehl, Director, Airport Operations, Seattle-Tacoma International Airport
Ralph Wessels, Capital Project Manager, Port of Seattle

0
US. Department                                 Northwest Mountain Region
ofTransportation                                    160l Lind Avenue S.W., Suite 315
Federal Aviation                                   Renton, Washington 98057-3356
Administration

November 7, 2016

Lance Lyttle
Managing Director
SeattleTacoma International Airport
P.O. Box 1209
Seattle WA, 981 l l-1209

Dear Mr. Lyttle,

Thank you for your November 1, 2016 letter regarding your Flight Corridor Safety Program.
The Port of Seattle (Port) has developed this program to insure the safety of the National
Airspace system and the SeattleTacoma International Airport. The Flight Corridor Safety
Program demonstrates that the Port is to attempting to take appropriate action to protect
instrument and visual operations to the airport. This effort is consistent with the Port's federal
grant assurance obligations, specifically grant assurances #19 Operation and Maintenance,
and #20 Hazard Removal and Mitigation.

As the Port clearly understands, the airport grant assurances, while obligatory, are in place to
assist the airport in maintaining a safe environment for all users.

In particular, grant assurance 19 requires the Port to operate the airport at all times in a safety
and serviceable condition and grant assurance 20 requires the Port to take appropriate action
to assure that terminal airspace will be adequately cleared and protected by removing existing
airport hazards and by preventing the establishment or creation of future airport hazards.

We support the Port of Seattle's proactive approach to remain in compliance with the federal
grant obligations through the development of the Flight Corridor Safety Program.

Sincerely
/gelleZn 5;f"Briggs
Manager, Seattle Airports District Ofce


Cc:   Michael Ehl, Director, Airport Operations, Seattle-Tacoma International Airport
Ralph Wessels, Capital Project Manager, Port of Seattle