WSDOT - Contract Ad and Award - Project Information

SR 509 Completion - Stage 1B


  • Contract Number: 9424
  • Interested Parties List:
    If you are interested in participating in this project, add your firm to our email list to receive future notices about this project.
  • For additional information on this project, please direct your inquiries to the Project Manager:
    Andrey Chepel
    Phone: (206) 805-2978

RFP Addenda


  • Q&A 1 (pdf 218 kb) - Posted 6/9/2020
  • Q&A 2 (pdf 37 kb) - Posted 6/15/2020
  • Q&A 3 (pdf 39 kb) - Posted 6/23/2020
  • Q&A 4 (pdf 43 kb) - Posted 6/24/2020 
  • Q&A 5 (pdf 51 kb) - Posted 7/9/2020

Voluntary Proposers Meeting

Request for Proposals

March 2020 Proposers Update Meeting

Short Listed Submitters

Procurement Update

Procurement Update

Submitters List


  • Q&A #1 (pdf 116 kb) - Posted 10/7/2019

RFQ Addenda

Voluntary Submitters Meeting

Request for Qualifications

Project Information Available

The files contained in in ‘Pre-Ad Documents’ folder and all subsequent subfolders are provided for informational purposes to assist the Proposers in preparing their Proposals. WSDOT makes no representation or warranty as to the accuracy, adequacy, applicability, or completeness of the files. WSDOT shall have no liability or obligation as a result of the inaccuracy, inadequacy, inapplicability, or incompleteness of the files, regardless of the contents thereof.

Last Updated: July 9, 2020