Contract summary
The SR 509 Stage 1b is the first major stage of the SR 509 Completion Project, located in King County in the cities of Des Moines, Kent and SeaTac. WSDOT plans to complete construction of the SR 509 Completion Project in two major stages by 2028.
When completed, the project will extend the existing four-lane SR 509 freeway from the SR 509/South 188th Street interchange in SeaTac, connecting to I-5 with a new interchange in the vicinity of South 212th Street. The project also builds approximately four miles of improvements along I-5 from I-5/SR 509 interchange to the I-5/S. 272nd Street interchange.
- Award status: Awarded
- Awarded To: Guy F. Atkinson Construction
707 South Grady Way, Suite 500
Renton, WA 98057-3224 - Award amount: $263,975,895.00
Conformed RFP
- Instructions to Proposers (PDF 1.2MB) - Posted 4/20/2021
- Chapter 1 (PDF 3.9 MB) - Posted 4/20/2021
- Chapter 2 (PDF 10.6MB) - Posted 4/20/2021
- Appendices (FTP Directory) - Posted 4/20/2021
Submitted SOQs and proposals
- Submitted SOQs and Proposals (FTP Directory) - Posted 2/9/2021
Notice to award
- Notice to Award (PDF 234KB) - Posted 12/11/2020
Price proposal opening results
- Apparent Best Value Determination (PDF 71KB) - Posted 12/2/2020
- Bid Tabulation (PDF 130KB) - Posted 12/2/2020
RFP addenda
- Addendum 1 (FTP Directory) - Posted 5/22/2020
- Addendum 2 (FTP Directory) - Posted 5/28/2020
- Addendum 3 (FTP Directory) - Posted 6/8/2020
- Addendum 4 (FTP Directory) - Posted 6/11/2020
- Addendum 5 (FTP Directory) - Posted 6/18/2020
- Addendum 6 (FTP Directory) - Posted 6/25/2020
- Addendum 7 (FTP Directory) - Posted 7/9/2020
- Addendum 8 (FTP Directory) - Posted 7/16/2020
- Addendum 9 (FTP Directory) - Posted 7/23/2021
- Addendum 10 (FTP Directory) - Posted 7/31/2020
- Addendum 11 (FTP Directory) - Posted 8/6/2020
- Addendum 12 (FTP Directory) - Posted 8/14/2020
- Addendum 13 (FTP Directory) - Posted 8/21/2020
- Addendum 14 (FTP Directory) - Posted 8/27/2020
- Addendum 15 (FTP Directory) - Posted 9/24/2020
- Addendum 16 (FTP Directory) - Posted 9/29/2020
RFP question & answer
- Q&A 1 (PDF 218KB) - Posted 6/9/2020
- Q&A 2 (PDF 37KB) - Posted 6/15/2020
- Q&A 3 (PDF 39KB) - Posted 6/23/2020
- Q&A 4 (PDF 43KB) - Posted 6/24/2020
- Q&A 5 (PDF 51KB) - Posted 7/9/2020
- Q&A 6 (PDF 80KB) - Posted 7/16/2020
- Q&A 7 (PDF 102KB) - Posted 7/31/2020
- Q&A 8 (PDF 92KB) - Posted 8/6/2020
- Q&A 9 (PDF 137KB) - Posted 8/14/2020
- Q&A 10(PDF 139KB) - Posted 8/20/2020
Voluntary proposers meeting
- Presentation (PDF 3.2MB) - Posted 5/20/2020
- Sign-In-Sheet (PDF 154KB) - Posted 5/20/2020
Request for proposals
- Instructions to Proposers (PDF 531KB) - Posted 5/12/2020
- Chapter 1 (PDF 2.1MB) - Posted 5/12/2020
- Chapter 2 (PDF 6.8MB) - Posted 5/12/2020
- Contract Form (PDF 127KB) - Posted 5/12/2020
- Appendices (FTP Directory) - Posted 5/12/2020
- ITP Fillable Forms (FTP Directory) - Posted 8/27/2020
March 2020 proposers update meeting
- Meeting Presentation (PDF 121KB) - Posted 3/31/2020
- Meeting Sign-in Sheet (PDF 30KB) - Posted 3/31/2020
Short listed submitters
- Short List Letter (PDF 92KB) - Posted December 9, 2019
Procurement update
- March 2020 Proposer Update Meeting Notice (PDF 57KB) - Updated 3/26/2020
- Proposers Update Meeting Notice (PDF 75KB) - Posted 1/21/2020
- Meeting Presentation (PDF 3 MB) - Posted 1/29/2020
- Sign-in Sheet (PDF 298KB) - Posted 1/29/2020
- Short List Letter (PDF 93KB) - Posted 12/9/2019
Procurement update
- Procurement Update (PDF 76KB) - Posted 11/19/2019
Submitters list
- Submitters List with Single Point of Contact (PDF 108KB) - Posted 11/7/2019
RFQ question & answer
- Q&A #1 PDF 116KB) - Posted 10/7/2019
RFQ addenda
- Addendum #1 (PDF 121KB) - Posted 9/16/2019
- Addendum #2 (PDF 133KB) - Posted 9/24/2019
- Addendum #3 (PDF 132KB) - Posted 10/7/2019
Voluntary submitters meeting
- Voluntary Submitters Meeting Sign-In Sheet (PDF 1.6MB) - Posted 9/13/2019
- Voluntary Submitters Meeting Presentation (PDF 2.9MB) - Posted 9/13/2019
Request for qualifications
- Request for Qualifications (PDF 430KB) - Posted 9/5/2019
- Fillable Form A (PDF 154KB) - Posted 9/24/2019
- Fillable Form B1 (PDF 155KB) - Posted 9/24/2019
- Fillable Form B2 (PDF 171KB) - Posted 9/24/2019
- Fillable Form C (PDF 160KB) - Posted 9/24/2019
- Fillable Form D (PDF 156KB) - Posted 9/24/2019
Project information available
- Advertisement Notice (PDF 386KB) - Posted 8/12/2019
- Fact Sheet (PDF 309KB) - Updated 8/12/2019
- Pre-Ad Documents (FTP Directory) - Updated 7/23/2020
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.