MOUNT SAINT HELENS SEDIMENT RETENTION STRUCTURE CREST RAISE

Solicitation

This document is a solicitation for the Mount St. Helens Sediment Retention Structure (SRS) Second Spillway Raise project. The U.S. Army Corps of Engineers, Portland District, is procuring services for this project.

The solicitation includes a comprehensive set of drawings and plans detailing the proposed construction. These include:

• Plans and Specifications: A detailed index of drawings covering general plans, site and staging areas, existing conditions, excavation isopachs, RCC structure alignments, berm profiles, berm sections, access road plans and profiles, access road sections, new instrumentation plans, and outlet works decommissioning details.

• Survey Data: Detailed survey plans, narratives, and control points are provided, including adjustments and shifts between different coordinate systems (NAD27, NAD83, NAVD88) to ensure accuracy for construction.

• Construction Details: Specific drawings illustrate the design of the RCC structure, berms, access roads, and the outlet works decommissioning.

• Solicitation Number: W9127N26BA004

• Date: November 2025

• Issuing Agency: U.S. Army Corps of Engineers, Portland District

Specific submission and evaluation criteria are not detailed in the provided document excerpts, but the extensive set of technical drawings and specifications indicates a complex project requiring detailed proposals.

Information regarding eligibility or set-aside requirements is not present in the provided document excerpts.

• The project involves raising the spillway of the Mount St. Helens Sediment Retention Structure.
• The documents include extensive survey data and coordinate transformations to ensure accuracy.
• Several sheets detail the construction of berms, access roads, and the decommissioning of outlet works.
• The solicitation number is W9127N26BA004.

Other / Unclassified

This document contains specific updates and substitutions for various sections of a contract, primarily focusing on construction operations, safety, quality control, and specific work elements like outlet works decommissioning, concrete construction, river diversion, excavation, and foundation preparation.

This document details critical modifications to the project's technical requirements and operational procedures. Key changes include:

• In-Water Work Window (IWW): Defines restrictions for work below the ordinary high-water mark (OHWM) and mandates compliance with specific water quality certifications. Non-potable water from the Toutle River is available at no charge, but contractors must manage sediment.
• Safety Requirements: Clarifies the presence and responsibilities of the Site Safety and Health Officer (SSHO) and Competent Person on-site. Key personnel, including SSHO, do not require double staffing for multiple shifts.
• Quality Control: Updates requirements for the Project Superintendent (minimum 10 years' experience, on-site presence) and CQC staff. Key personnel, including CQC System Manager, do not require double staffing for multiple shifts.
• Outlet Works: Specifies that 25 of 30 steel pipes have knife valve closures, and 6 leaking valves require hot tapping or an alternate plug method. A Valve Inspection Report is required.
• Roller Compacted Concrete (RCC): Defines qualifications for RCC Production and Placement Superintendent and Supervising/Testing Technicians. RCC must achieve a 7-day minimum compressive strength of 2,500 psi before water release.
• River Diversion: Allows steel or concrete culverts within the RCC structure, subject to specific requirements.
• Excavation: Clearing and grubbing requires removal of all vegetation and sediment down to bedrock, with disposal compliant with local ordinances.
• Foundation Preparation: Estimates upstream sediment thickness between 9.5 and 11 feet. Rock joint conditions are unknown, and previous work did not require extensive dental concrete.

Bidders should carefully review these modifications as they impact project execution, material sourcing, personnel qualifications, safety protocols, and quality assurance.

Solicitation / RFP / RFQ

This solicitation, W9127N26BA004, is for the Mount Saint Helens Sediment Retention Structure Crest Raise project located in Toutle, Cowlitz County, Washington. The magnitude of construction is estimated to be between $25,000,000 and $100,000,000. The acquisition is unrestricted, full, and open competition. A 10% HUBZone Price Evaluation Preference will be applied.

The project involves constructing an increased level of sediment retention structure, providing additional storage, and allowing existing river flows. Specific tasks include:

• Mobilization and Demobilization (CLIN 0001)
• Site Preparation, including sediment excavation and clearing (CLIN 0002)
• Care and Diversion of Water, including channel excavation, cofferdam, dewatering, etc. (CLIN 0003)
• Placement of Dental Concrete (CLIN 0004)
• Placement of Roller Compacted Concrete (RCC) for a 5-foot raise (CLIN 0005)
• Rock Excavation for a 5-foot plunge pool (CLIN 0006)

Optional items include:

• Decommissioning of Outlet Works (CLIN 0007)

• Placement of RCC for a 10-foot raise (CLIN 0008)

• Rock Excavation for a 10-foot plunge pool and low flow channel (CLIN 0009)

• Contract Type: Firm Fixed Price Construction.

• Period of Performance: Begin performance within 10 calendar days of notice to proceed, and complete within 846 calendar days after receiving notice to proceed.

• Performance Bonds: Required.

• Cybersecurity: CMMC Level 1 (Self) is required.

• Proposals must be submitted electronically in Adobe Acrobat PDF format.

• Hard copy/paper proposals will not be considered.

• Bid bond is required.

• Offerors must submit bids via email by the date and time established in Block 13 of the Standard Form (SF) 1442.

• Bid validity period is 120 days from the bid due date.

• Offers will be publicly opened at the bid due date and time.

• A 10% HUBZone Price Evaluation Preference will be applied.

• Unrestricted, Full and Open Competition.

• 10% HUBZone Price Evaluation Preference will be applied.

• A site visit is scheduled for December 1, 2025, at 11:00 AM PST. Registration is required.

• Hard hats and steel-toed boots are required for the site visit.

• Offerors are cautioned that the listed provisions may include blocks that must be completed by the offeror and submitted with their quotation or offer. Full text of provisions may be accessed electronically.

• A Project Labor Agreement (PLA) is required for large-scale construction projects.

• NAICS code: 237990 Other Heavy and Civil Engineering Construction.

• Cybersecurity Maturity Model Certification (CMMC) Level required is CMMC Level 1 (Self).