Barton CSO Control Project
Construction of the bioretention swales will occur in phases, with preparation work beginning in July 2013 and major street construction occurring over two seasons in 2014 and 2015.
2014 street schedule for construction
March 24, 2014 Update -- weekly constuction updates are now posted on the project home page.
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
Year 2 street notifications
February 6, 2014
The map on the left shows the planned construction sequence. The dates provided below are approximate and intended to give neighbors a general sense of when major construction will begin on their block. Each block will be under construction for approximately two months, followed by a plant establishment period and testing. These dates are subject to change. Residents will receive notice two weeks before the start of major construction on their street, and additional notifications will be sent out for each new or different construction activity.
Planned start of construction for each block:
Early March: 7300 block 34th Ave SW
Late March: 7500 block 34th Ave SW
Mid April: 7900 block 34th Ave SW
Mid April: 7300 block 31st Ave SW
Late April: 7500 block 31st Ave SW
Mid-May: 7700 block 31st Ave SW
Early June: 7900 block 31st Ave SW
June: SW Kenyon St between 34th Ave SW and 32nd Ave SW
To prepare for construction, deep wells at the southern end of streets slated for swales will also be installed this winter and spring, at a rate of approximately one well per week.
Please contact the project hotline with any questions or concerns: 206-205-9184.
Thank you for your patience and cooperation.
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: Bioretention swale 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 swales will change over time
Bioretention swales change over time as plants mature and become well-established.
View larger version (PDF).