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NORTHLAKE SEISMIC/RETROFIT RETAINING WALL PROJECT; SDOT 20-005

Original Date Posted: September 1, 2021 6:00 am


Due Date:

Wednesday, September 22, 2021 2:00 p.m.

CITY OF SEATTLE
Request for Statement of Qualifications
Consultant Services

==========================================

Project: SDOT 20-005
Northlake Seismic/Retrofit Retaining Wall Project

The City of Seattle, through Seattle Department of Transportation, requests Statements of Qualifications from qualified firms for the design of the replacement for the 432-ft long deteriorated Northlake Retaining Wall located along Lake Union in Seattle’s Fremont neighborhood. The retaining wall, originally constructed in 1952, relies upon creosote timber treated piles and timber lagging tied back with steel rods to concrete anchors buried in fill behind the wall. The exposed height of the wall varies from approximately 5 to 15 ft.

SDOT initially investigated shoring up of the existing wall with modern steel elements and more robust tiebacks.  However, while these retrofits could address improvements to the existing wall’s strength, they could not solve the underlying seismic liquefaction issues due to the presence of liquifiable soils at depths exceeding 30 ft below the ground surface.  Therefore, SDOT is pursuing a larger scale seismic retrofit project.

Based on preliminary engineering studies that included a high-level alternatives analysis, the leading replacement wall alternative concept type relies upon a combination of sheet-pile cutoff wall and improving upland soils behind the wall with grout to resist movement during an earthquake. This alternative will impact most of the right-of-way and would require reconstruction of Northlake Way adjacent to the wall and temporary relocation/replacement of utilities serving adjacent private waterfront facilities.

This contract is estimated to be approximately $3 Million for Final Design, with approximately $1.3 million being for Preliminary Design.  This estimate includes both Preliminary Design to 30%, and potentially thereafter it would also include Final Design from 30% to 100% design. 

This is anticipated to be a multi-year and possibly phased contract, for approximately 3 years. Estimated start is 3rd quarter 2021 for 30% design through to May 2022.  Future phases of work may include final PS&E, to occur in 2022 into 2023 and construction design support in 2023 & 2024.

An online Pre-submittal meeting is planned for Wednesday, September 8, 2021.Additional details to follow on ProcureWare.

Interested qualified consultants may request the Request for Qualifications packet at the following address: City of Seattle Procurement (seattle.procureware.com).

NOTE: YOU MUST FORMALLY REGISTER AT ProcureWare IF YOU WISH TO RECEIVE ADDENDA.

The Request for Qualifications packet includes a more detailed Scope of Work, administrative requirements such as sub-consulting, insurance, selection process, schedule, etc.

Electronic Submittals must be received by the Seattle Department of Transportation, Attention: Pamela Garcia – DOT_CCU@seattle.gov, by 2:00 p.m. Wednesday, September 22, 2021.

Any questions regarding this Request for Qualifications may be submitted via ProcureWare.  Response to questions will be provided via ProcureWare.

The City of Seattle in accordance with Title VI of the Civil Rights Act of 1964, 78 Stat. 252, 42 U.S.C. 2000d to 2000d-4 and Title 49, Code of Federal Regulations, Department of Transportation, subtitle A, Office of the Secretary, Part 21, nondiscrimination in federally assisted programs of the Department of Transportation issued pursuant to such Act, hereby notifies all bidders that it will affirmatively ensure that in any contract entered into pursuant to this advertisement, disadvantaged business enterprises as defined at 49 CFR Part 26 will be afforded full opportunity to submit bids in response to this invitation and will not be discriminated against on the grounds of race, color, national origin, sex, handicap/disabled, age in consideration for an award. 


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