PORT OF SEATTLE 
MEMORANDUM 
COMMISSION AGENDA             Item No.      5a 
Date of Meeting    October 11, 2011 
DATE:    October 4, 2011 
TO:      Tay Yoshitani, Chief Executive Officer 
FROM:    Mike Ehl, Director, Airport Operations 
Wayne Grotheer, Director, Aviation Project Management Group 
SUBJECT: Lagoon 3 Bird Wires Project (CIP # C800417) at Seattle-Tacoma International
Airport 
Amount of This Request: $169,000        Source of Funds: Airport Development Fund 
Total Estimated Cost: $1,631,000 
ACTION REQUESTED: 
Request Port Commission authorization for the Chief Executive Officer to prepare design and
construction bid documents for the Lagoon 3 Bird Wires project. The budget requested for this
design work is $169,000, while the total estimated budget for the completed project is
$1,631,000. 
SYNOPSIS: 
This is a safety improvement project that will reduce the risk of aircraft strikes with waterfowl.
Federal Aviation Regulations (FAR) part 139.337 require airports, including Seattle-Tacoma
International Airport (STIA), to take immediate measures and mitigate wildlife hazards
whenever hazardous conditions exist. A particular emphasis is placed on identification and
mitigation of wildlife attractants within and near the airfield. 
This project will reduce access by waterfowl to the industrial wastewater system (IWS) Lagoon
3, which is located near the south end of the airfield about 1,000 ft. from the approach end of
runways 16L/34R and 16C/34C. The proximity of Lagoon 3 to the ends of the runways can be
seen on Exhibit A. The inability of waterfowl to access the pond will reduce their presence in
the area as well as reduce an operational need for conducting repeated wildlife hazard mitigation
measures, such as launching pyrotechnics and shooting with firearms.
BACKGROUND: 
Ponds are an attractant to wildlife, particularly waterfowl. Lagoon 3, with an approximate length
of 1200' and width of 500', is identified as one of the most prominent waterfowl attractants at
STIA. Pond liners are presently being used to prevent vegetation growth which would give rise
to a variety of food resources and therefore would be a further attraction for wildlife. However,
snails, which provide a food source for some waterfowl and shorebirds, have been recently found
in the lagoon.

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
October 4, 2011 
Page 2 of 5 
Lagoon 3 lies in the area within a 10,000-foot radius of the runway centerline, which is defined
as the FAA critical zone with respect to airport wildlife hazard management. Over 75% of all
civil bird-aircraft strikes occur within a horizontal distance of 10,000 feet from an airfield. The
U. S. Department of Agriculture's (USDA's) Wildlife Services, through an interagency
agreement with the Federal Aviation Administration, compiled 109,085 wildlife strike reports
from 1,659 USA airports and 534 foreign airports from January 1990 to December 2010. The
number of reported wildlife strikes is estimated to represent only about 39% of the wildlife
strikes that have occurred.
Wildlife strikes are an increasing and significant potential hazard at STIA. A total of 51 wildlife
strikes were recorded at STIA in 2009. In 2010, the number of wildlife strikes increased to 69.
The frequency with which hazardous birds were harassed and lethally removed has increased
dramatically since 2002 when Lagoon 3 monitoring for 1 to 2 hours per week began. During
2009, a total of 144 birds were dispersed and 29 lethally removed. By contrast, in 2010 a total of
607 birds were dispersed and 104 lethally removed. 
Besides being an air safety hazard, bird strikes can result in significant costs from the damage to
aircraft. The estimated cost of at least one 2010 bird strike at STIA is known to exceed $450,000. 
On April 4, 2006, a US Airways Airbus 319 struck a single Green-winged teal (duck) when over
IWS Lagoon 3. After the bird was ingested in to the engine the aircraft made an precautionary 
landing at STIA. The cost to the airline was 85 hours out of service in Seattle. When sufficient
repairs could not be made here, the aircraft was shuttled back to the east coast for further
evaluation and repairs. The final costs for damage and downtime were not available to the Port
of Seattle. Damage from a bird-aircraft strike at the Orlando-Sanford Airport in 2010 reportedly
cost $4,570,000. 
Different species of waterfowl and other water associated birds (killdeer, gulls, cormorants) will
access ponds differently, some from above and some from the sides. Therefore, preventing
waterfowl access from the both the top and sides is necessary to effectively discourage their
presence in the area. Considerations in the selection of the best measure to use at Lagoon 3
include the anticipated effectiveness, the size of the pond, constructability, ease of maintenance,
and initial and longer-term maintenance costs. The cost of this project increased from $386,000
to $1,631,000 as Airport staff reviewed various deterrent options and configurations to deter
waterfowl and other water-associated birds and determined that installing netting over the top
and around the perimeter of Lagoon 3 is the only way to positively exclude birds from using the
site. Other measures would be ineffective over the long-term as birds adapt to them or would not
prevent birds from accessing Lagoon 3. 
PROJECT JUSTIFICATION: 
This is a safety improvement project that will reduce waterfowl access to Lagoon 3 near the
STIA runways. Federal Aviation Regulations (FAR) Part 139.337 require airports, including
STIA, to take immediate measures and mitigate wildlife hazards whenever hazardous conditions
exist. Mitigation plans to reduce the attraction of waterfowl to the area will improve air traffic
safety at STIA.

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
October 4, 2011 
Page 3 of 5 
Project Objectives: 
The objective is to reduce the presence of waterfowl at Lagoon 3 in order to improve air safety at
STIA.
PROJECT SCOPE OF WORK AND SCHEDULE: 
Scope of Work: 
This project will install netting at Lagoon 3 to reduce the presence of waterfowl near STIA.
Schedule: 
Design Complete                     March, 2012 
Commission Authorization to Advertise        March, 2012 
Advertise                          March, 2012 
Construction Complete                  October, 2012 
FINANCIAL IMPLICATIONS: 
Budget/Authorization Summary: 
Original Budget                                $ 386,000 
Budget Increase                                $1,245,000 
Revised Budget                               $1,631,000 
Previous Authorizations this CIP                      $ 0 
Current request for authorization                      $ 169,000 
Total Authorizations, including this request               $ 169,000 
Remaining budget to be authorized                    $1,462,000 
Budget Status and Source of Funds: 
This project is included in the capital budget and plan of finance as a business plan prospective
project within CIP #C800417 . The funding source will be  the Airport Development Fund.
Related construction costs identified as expense costs will also be funded with the Airport
Development Fund.
Financial Analysis and Summary: 
CIP Category                     Compliance 
Project Type                       Health, Safety and Security 
Risk adjusted Discount rate              N/A 
Key risk factors                       N/A 
Project cost for analysis                 $1,631,000 
Business Unit (BU)                   Airfield 
Effect on business performance           NOI after debt service will increase 
IRR/NPV                    N/A 
CPE Impact                     $.01 increase in 2013, but no change compared to
business plan forecast as this project was included.

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
October 4, 2011 
Page 4 of 5 
Lifecycle Cost: 
The estimated useful life for the recommended netting option is 40 years for posts, 15 years for
supporting cabling and 6 years for top and perimeter nettings. 
The estimates for 40 years life-cycle cost include inspections, maintenance of wire and netting, 
and vegetation control. Annual Operation & Maintenance (O&M) expenses are estimated at
$2,500. The estimates do not include the cost for wires or nettings replacement as noted above,
netting is estimated to need replacing every 6 years after installation and the support wires are
estimated to need replacing approximately every 15 years after installation. Capital projects to
renew and replace the netting and support wires will be brought forward at the time of need.
ENVIRONMENT AND SUSTAINABILITY:
Certain products of the full netting system may contain recycled materials, such as steel. 
However, the inclusion of recycled steel would be market driven and not a project requirement.
The elimination of access to Lagoon 3 by waterfowl will reduce the need to use lethal methods
for their removal near STIA. 
STRATEGIC OBJECTIVES: 
This project supports the Port's strategy for a World-Class Airport that is safe and secure.Moving
forward with this project will improve safety by minimizing the chances for birds to become ingested
into aircraft engines. 
TRIPLE BOTTOM LINE SUMMARY: 
Applying full bird nettings over and also around the perimeter of IWS Lagoon 3 will minimize
the access of birds to the pond and discourage their presence in the area. This will increase air
traffic safety at STIA. 
ALTERNATIVES CONSIDERED AND THEIR IMPLICATIONS: 
1)  Alternative 1 - Do Nothing: The increased habitual use of IWS Lagoon 3 by waterfowl is
well documented in the weekly airport survey data. The pond is located at the south end
of runway 16C/34C and adjacent to runway 16L/34R. Doing nothing would result in an
increasing potential risk of bird-aircraft strikes and not comply with FAR requirements.
There is no capital cost with this approach. The "do nothing" approach is not
recommended. 
2)  Alternative 2 - Other Deterrent Devices: Other deterrent devices, such as a remote
control air boat, have been used experimentally at STIA. The tool is effective only when
a person is present to operate it. A sprinkler system was also utilized in Lagoon 3 as a
means to scare birds away but was removed due to its ineffectiveness. Sprinklers and
similar devices have limited effectiveness as birds become accustomed to them. The
capital cost associated with this approach would be low but so would the effectiveness.
The approach of using these types of devices is not recommended.

COMMISSION AGENDA 
Tay Yoshitani, Chief Executive Officer 
October 4, 2011 
Page 5 of 5 
3)  Alternative 3 - Bird Wires: The original basis for the project consisted of installing a
single level of bird wires over Lagoon 3. Additionally, various configurations of
stretching single and multiple levels of bird wires, both with and without perimeter
netting, were evaluated for this alternative. These options ranged in cost from $533,000
to $1,169,000. None of these options would provide a sufficient deterrent or obstacle to
prevent birds from accessing Lagoon 3 in some manner and creating an air safety hazard.
The use of bird wires is not the recommended alternative. 
4)  Alternative 4 - Full Bird Netting: This alternative for the project would be to install
netting over the top and around the perimeter of Lagoon 3. Bird netting is the only way
to positively exclude birds from using the site. The cost for this alternative is the highest
cost but minimizes access by waterfowl. The capital cost for Alternative 4 is estimated to
be $1,631,000 with a potential expense cost of $150,000 for managing stormwater during
construction. This is the recommended alternative. 
OTHER DOCUMENTS ASSOCIATED WITH THIS REQUEST: 
Exhibit A: Drawing of IWS Lagoon 3. 
PREVIOUS COMMISSION ACTION: 
None.