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Wastewater Treatment

King County, Washington

For questions about the Wastewater Treatment Division website, please send an e-mail message or contact us at:

King Street Center
201 S. Jackson St., Suite 500
Seattle, WA 98104-3855
Phone: 206-477-5371
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

Get Directions to our office location in Seattle, Washington.

Staff Contacts

Barton CSO Control Project

Construction

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.

Planned construction sequence in 2014
Barton CSO Control Project area
 

Block Updates

#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.
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
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

2.1StreetConstruct_3002.2StreetConstruct_300
Seattle streets under construction

How swales will change over time

Bioretention swales change over time as plants mature and become well-established. 

How swales will change over time -- two examples of Seattle-area bioretention systems
View larger version
 (PDF).

Barton CSO-GSI Control Project Timeline, June 2013
Barton CSO-GSI Control Project Timeline, June 2013

What you can expect during construction

  • Bioretention swales constructed in two seasons – March to October 2014 and March to October 2015
  • Each block will take approximately two months to complete
  • Work hours in compliance with City of Seattle permits, which typically allow work between 7 am and 6 pm Monday to Friday
  • Local access at all times for homeowners and emergency vehicles
  • Pedestrian access at all times
  • Restricted parking while street is in construction

For more information