HomeMy WebLinkAboutC_800_Garden_TIA_On_Hold_Response_Letter_230207 TENW
Transportation Engineering NorthWest
Transportation Planning | Design | Traffic Impact & Operations
11400 SE 8th Street, Suite 200, Bellevue, WA 98004 | Office (425) 889-6747
February 7, 2023
Clark H. Close
Principal Planner
City of Renton
1055 S Grady Way
Renton, WA 98057
Subject: 800 Garden / LUA22-000415
Response to “On Hold” Notice regarding Traffic Impact Analysis
Clark,
Thank you for meeting with us last week to discuss the City’s transportation comments in your “On Hold”
Notice dated 1/25/23 related to the 800 Garden TIA dated 12/7/22. In response to our discussion, we
propose the following as next steps to address the forecast LOS F at the Southport Dr/Garden Ave/Lake
Washington Blvd intersection in 2037 with full buildout of the 800 Garden project. Given that this
intersection was the only intersection identified to operate at a failing LOS in 2037 during the PM peak
hour only, we propose that additional LOS evaluation is not necessary at the other 15 study intersections.
For the Southport Dr/Garden Ave/Lake Washington Blvd intersection we propose to:
1. Evaluate weekday PM peak hour LOS for the following interim buildout years to determine if
acceptable LOS E operation is achieved prior to full buildout in 2037:
a. 2027 with Phase 1 of 800 Garden development
b. 2032 with Phase 1+2 of 800 Garden development
2. Identify a cost for adaptive signal control at the intersection; this may include input from City
transportation staff.
3. Revise TIA to include updated LOS results at the intersection for interim Phase 1 and Phase 2
buildout years (2027 and 2032 respectively), and include adaptive signal control at the
intersection as proposed mitigation for the 800 Garden development for the buildout year in
which the LOS F is triggered (2027, 2032 or 2037).
We would be happy to discuss this approach further with your technical committee to confirm this
approach before proceeding. Please advise if you want to schedule a meeting and we can provide our
availability.
Sincerely,
Transportation Engineering NorthWest
Jeff Schramm
Principal
schramm@tenw.com
(206) 396-8286
cc: Bryon Wolf, Bay West Development