ITEM NO: ______6b_supp____ 
DATE OF 
MEETING: October 22, 2013_ 

Port / City of SeaTac Interlocal Agreement (ILA) 
Proposed Amendment 3 
Briefing Outline 
2005 ILA 
2007 ILA Amendment 
ILA Amendment 3

2005 ILA 
Term of agreement: February 2006  February 2016 
Governs land use, surface water management, transportation &
material haul 
Includes allocation of parking tax to approved projects 
36.9% South Access Road, Westside Trail & Ring Road 
63.1% Other City Projects

2007 ILA Amendment 
Added SR 518 project with $5 million cap 
Split Port parking tax allocation into two buckets 
22% South Access Road & SR 518 
14.9% Westside Trail & North SeaTac Roadways 
63.1% allocated to other City projects

ILA Amendment 3 
Adds S. 170th Street Roundabout with $1 million cap 
Provides traffic control at Cell Phone Lot entrance and southbound North
Airport Expressway off-ramp 
Cell Phone Lot construction approved by Commission 09/10/13 
Adds Connecting 28th/24th Avenue South project with $4 million cap 
Provides a more direct route between the airport and Port properties 
Part of South Access Phase 1 
Both projects will access funds from the Port's 22% parking tax allocation 
Adequate funds projected through the term of the ILA 
Both projects meet the intent of the ILA 
Mitigate the impact of airport traffic on City streets

SR 509





South 170th
Street Roundabout

onnecting 28thI24th                                                             +
Avenue South
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