SE 172nd St & 125th Ave SE Green Stormwater Infrastructure Project

Contact Information
Kevin Evans, P.E.
Surface Water Engineering
Renton, WA 98057
425-430-7241

The SE 172nd St & 125th Ave SE Green Stormwater Infrastructure Design Project will improve the water quality of stormwater runoff from roughly two acres of residential roadway near the intersection of SE 172nd St & 125th Ave SE. The project will also provide improvements to the stormwater conveyance system and pedestrian safety.

Project design is primarily funded by a Washington State Department of Ecology grant in the amount of $250,000. Additional funds required for project design will be provided by the city.

Contract Award Information

The Surface Water Utility solicited proposals from consultants in accordance with City policy 252-02. Five proposals were received and evaluated, and two consultant firms were selected for interviews. Osborn Consulting, Inc. ranked the highest and was selected to perform the work.
  

Council awarded the professional services contract to Osborn Consulting, Inc., in the amount of $257,889, at its regularly scheduled meeting on April 15, 2019.

Project work under the agreement will take approximately 10 months to complete, and includes survey, geotechnical, and civil engineering design services.

Project Description

Stormwater improvements will include construction of a new conveyance system to increase drainage capacity and bioretention, and Contech Filterra facilities to collect and treat roughly two acres of pollution-generating roadway to improve water quality to the downstream wetland and Big Soos Creek. The project will also abandon the existing public stormwater mains crossing through private residential properties.

Other improvements will include construction of sidewalk and planter strips for improvements to pedestrian safety and traffic calming.

Project Updates

Completed project schedule milestones are as follows:
April 2019: Awarded professional services contract to Osborn Consulting, Inc.
July 2019: 30% Design Complete
November 2019: 60% Design Complete

Tentative project schedule milestones are as follows:
May 2020: 90% Design Complete
September 2020: 100% Design Complete
October 2020: Apply for construction grant funding from the Washington State Department of Ecology
Summer 2021: Begin Construction
Summer 2022: Finish Construction

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