Rainier Ave N and Benson Rd S Culvert Improvement

Contact Information
Ken Srilofung, P.E.
Surface Water Engineer
Renton, WA 98057
425-430-7241

The project includes the rehabilitation of 65 linear feet of 36-inch corrugated metal pipe (CMP) and 78 linear feet of 24-inch CMP to extend or restore the service life of the stormwater pipes.

The project is partially funded through the King County Flood Control District’s 2018 Flood Reduction Grant.  The grant covers 75% of the project’s estimated costs for design, grant management and environmental permit preparation.

Contract Award Information

Several engineering firms from the Municipal Research and Service Center (MRSC) Consultant Roster were assessed based upon their Statement of Qualifications. The most highly qualified firm selected to provide engineering design services was CHS Engineers, LLC. 

The agreement with CHS Engineers, LLC, in the amount of $69,200, was signed by Mayor Law and executed on December 20, 2018. 

Project work under this agreement will include hydraulic analysis; topographical and boundary survey; alternative analysis; developing construction plans, specifications and cost estimates and providing assistance during bidding.

Project Description

The city of Renton has completed the design work to rehabilitate the existing 24-inch and 36-inch diameter CMP culverts using Trenchless Technology construction methods, Cured in Place and Slip Liner. The rehabilitation of these two CMPs were necessary due to age and structurally poor conditions. These improvements will reduce the risk of upstream street flooding and preserve public access and commuter road safety.

Project Update

The design phase included reviewing existing data, survey and base mapping, hydraulic analysis, obtaining a temporary construction easements, environmental permitting and determination, development of design report, construction plans and specifications.

The Rainier Culvert Improvement project construction phase started on August 19, 2019 and was completed on November 1, 2019.

The Benson Road S Culvert Improvement project construction phase started on August 14, 2020 and was completed on November 12, 2020.  The total project construction cost for these two sites combined was $233,587.77.

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