Z--GAOA BAR ISLAND DAM RECONSTRUCTION

Technical Specifications

This document provides the detailed technical specifications for the Bar Island Dam Reconstruction project in Phillips County, Montana. It outlines the requirements for various construction divisions, including General Requirements, Sitework, Concrete, and Metals, as well as appendices for Geotechnical Data and Original Drawings. The project aims to reconstruct the dam, replace the existing outlet works, and improve the auxiliary spillway.

This document is critical for potential bidders as it defines the complete scope of work, material requirements, quality control standards, and payment procedures. Key information for bidders includes:

• Work Scope: Detailed tasks for dam reconstruction, demolition, earthwork, concrete, metal fabrication, and site restoration, including dewatering, excavation, embankment reconstruction, and spillway grading.

• Submittals: An extensive list of required plans, test results, product data, shop drawings, and certifications (e.g., Land Use Plan, Survey Plan, Stormwater Pollution Prevention Plan (SWPPP), Quality Procedures Plan, Concrete Mix Design, Reinforcement Drawings, Installation Plans). Many submittals are required a minimum of 30 days prior to needing approval or delivery to the site.

• Quality Control & Assurance: The Contractor is responsible for Quality Control (QC) and must submit a QC plan and test results. The Government will perform Quality Assurance (QA) and requires contractor cooperation and access.

• Measurement & Payment: Specifies how various work items (e.g., mobilization, demolition, excavation, embankment, riprap, culverts, outlet works, toe drains, fabrics, general construction operations, spillway armoring) will be measured and paid, including lump-sum and unit-price items. Bid prices must cover all associated costs.

• Material Requirements: Detailed specifications for materials such as riprap rock, various earth dam materials (compacted fill, road gravel, filter sand, drain gravel, hydrated lime), geosynthetics (filter and stabilization fabrics), concrete block mats, HDPE pipes, corrugated metal pipes, concrete (mix design, admixtures, reinforcement), and metals.

• Geotechnical Considerations: The Geotechnical Data Report (Appendix A) highlights site-specific challenges including highly corrosive soils (requiring corrosion protection for buried metals and specific concrete mix design), and potentially dispersive clay soils (requiring mitigation like filter diaphragms, blanket drains, and lime treatment). Lime treatment requires 3% lime by weight and a minimum 7-day mellowing time.

• Project Management: Requirements for pre-construction and progress meetings, permits (Contractor's responsibility), traffic control (compliance with MUTCD), material storage, contract closeout procedures, and project record drawings.

• The BID FORM and DRAWINGS are bound separately and are essential for a complete bid.

• Contractor is responsible for all costs associated with obtaining permits, protecting equipment/materials, and ensuring site access.

• Strict adherence to specified tolerances, testing frequencies, and quality standards is required.

• The document emphasizes the need for careful planning and submittals to ensure compliance and avoid delays.

Sources Sought Notice

This notice is issued by the Bureau of Land Management (BLM) for market research purposes to gauge industry interest, capacity, qualifications, and experience for the Bar Island Dam Rehabilitation project. The BLM is not requesting proposals at this time but will use the information gathered to develop an acquisition strategy. A competitive acquisition is anticipated.

The project involves the reconstruction of Bar Island Dam in Phillips County, Montana. Key activities include dewatering the reservoir, excavating and reconstructing the dam embankment, constructing a new precast concrete outlet works riser and conduit, building a grouted riprap stilling basin, excavating and grading the spillway, placing gravel surfacing, and reclaiming disturbed areas.

• Dewater reservoir and construction area.

• Reconstruct dam embankment with compacted fill, lime-amended backfill, and imported rock riprap.

• Construct new precast concrete outlet works riser and reinforced concrete pipe conduit.

• Construct grouted riprap outlet works stilling basin.

• Excavate, fill, and grade the spillway.

• Place gravel road surfacing.

• Reclaim disturbed areas.

• NAICS Code: 237990 – Other Heavy and Civil Construction

• Small Business Size Standard: $45.0M

• Anticipated Solicitation Issuance: April/May 2026

• Anticipated Period of Performance: To be completed by November 2027

• On-site work restrictions: December 1 – July 15 annually

• Bonding: Bid, performance, and payment bonds will likely be required.

• Magnitude of Construction: Estimated between $1M – $5M

• Interested businesses (large and small) are requested to submit:

  • Company name, SAM UEI, address, POC, phone, email.
  • Business classification (large/small, and specific socioeconomic categories if small).
  • Information demonstrating experience with similar heavy civil projects (demolition, dewatering, concrete work, excavation, riprap, etc.).
  • Statement regarding bonding capacity.

• Submittal Due Date/Time: March 13, 2026, 2:00 PM MST

• Submit To: Lisa McKeon / Contracting Officer / lmckeon@blm.gov

• Responses are requested from both large and small businesses.

• The amount of interest and quality of responses will determine if a small business set-aside is possible.

• Specification and drawings are provided in DRAFT format for comment.

• Comments are considered public information.

• Response is voluntary; no reimbursement for costs.

• Work restrictions apply annually to protect endangered species.

Forms / Attachments / Pricing Sheets

This document is a "Cover Sheet and Sheet Index" for the "Bar Island Dam Modifications" project. It serves as an index to all the drawings included in the project set, providing a comprehensive list of all sheets and their corresponding titles and CAD drawing numbers.

• Project Title: Bar Island Dam Modifications
• Location: Phillips County, Montana
• Drawing Index: A table listing each sheet number, drawing title (e.g., "Cover Sheet and Sheet Index," "Location and Vicinity Maps," "Dam Embankment Sections"), and the associated CAD drawing file name.
• Designer Information: Details for DOWL, the design firm, including contact information and project engineer.

This document is crucial for bidders as it provides a roadmap to all other technical drawings associated with the Bar Island Dam Modifications project. It allows potential bidders to quickly identify and locate specific drawings related to different aspects of the dam modifications, such as site plans, embankment sections, outlet works, and spillway improvements, which are essential for understanding the full scope of work and preparing a bid.