Barton CSO Control Project
Construction of the bioretention swales (roadside rain gardens) will occur in phases, with preparation work beginning in July 2013 and major street construction occurring over two seasons in 2014 and 2015.
2015 street schedule for construction
March 2015 Update -- weekly construction updates will be posted on the project home page.
2015 street construction schedule (view 2014 schedule)
Block updates (to be posted)
7300 block 32nd Ave SW
7300 block 30th Ave SW
7500 block 32nd Ave SW
8100 block 31st Ave SW
8600 block 31st Ave SW
Barton CSO Control Project area
#1, 7300 block 34th Ave SW
#2, 7500 block 34th Ave SW
#3, 7900 block 34th Ave SW
#4, 7300 block 31st Ave SW
#5, 7500 block 31st Ave SW
#6, 7700 block 31st Ave SW
#7, 7900 block 31st Ave SW
#8, SW Kenyon St, between 34th Ave SW and 32nd Ave SW
#9, 8400 block 34th Ave SW
(Year 2 block moved to 2014)
#10, 8600 block 34th Ave SW
(Year 2 block moved to 2014)
Year 2 street notifications
Fall 2013 – Winter 2014: Tree transplant and well drilling
Starting in October, trees scheduled for transplant to private property owners will be dug up, balled and put in a burlap sack in front of the property for transplant. Homeowners will be notified in advance of transplant work and are responsible for transplanting tree to their yard. Trees scheduled for transplant to a new location in public right-of-way will be replanted by the tree crews.
Between January and May 2014, crews will drill the wells that will carry stormwater deep underground on all 15 blocks.
Landscape crews will dig up trees and prep them for transplant to private property or a new location in the public right-of-way.
Well construction uses drill rigs and heavy trucks similar to those used for the 2011 geotechnical field work.
Spring 2014 – Fall 2015: Roadside rain garden construction
Street construction will occur in phases, with half of the streets scheduled to be built in 2014 and the other half in 2015. Once the contractor is on board in fall 2013, a detailed street schedule will be developed and shared with the community. Heavy construction is expected to take about two months per street. Once plants are established and the swale system has been tested for infiltration, stormwater will be allowed to flow in. Final street restoration (permanent paving) occurs at the end of construction.
Street construction includes five major activities:
- Demolition of existing planter strip
- Installation of pipes, bioretention soil, and vegetation
- Restoration of curb, street, and existing landscaping as needed
- Plant establishment (approximately two months)
- Flow testing and system commissioning
Seattle streets under construction
How roadside rain gardens will change over time
Roadside rain gardens change over time as plants mature and become well-established.
View larger version (PDF).