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Amendment / Modification

This amendment (0001) to solicitation 140P4326R0018, originally dated 04/27/2026, serves to provide additional attachments and clarify the period of performance.

• Attachments: The following attachments have been added:

  • Attachment 5: Davis Bacon Wage Determination MD20260113
  • Attachment 6: RFIs 1-4
  • Attachment 7: Construction Drawings THST 1997
  • Attachment 8: THST Visitor Center Renovation 2007
  • Attachment 9: Photos THST Visitor Center Roof
  • Attachment 10: Site Visit Sign-In Sheet

• Proposal Due Date: The proposal due date remains unchanged at 6/12/2026 at 12:00 PM ET.

• Period of Performance: The period of performance has been clarified as 08/01/2026 to 10/30/2026.

Form / Attachment / Pricing Sheet

This document is a sign-in sheet for a pre-bid site visit related to the "Repoint Brick, Gutter Installation and Metal Roof Installation" project.

• Date and time of the site visit: May 6, 2026, at 9:00 a.m.
• Park/Unit: GEWA & THST
• Project Title: Repoint Brick, Gutter Installation and Metal Roof Installation
• Solicitation Number: 140P4326R0018
• Contracting Specialist: Samuel C. McKenzie
• Attendees' names, company affiliations, phone numbers, and email addresses.

This document lists the companies and individuals who attended the pre-bid site visit. Potential bidders can use this information to identify other interested parties, potential competitors, or potential teaming partners. It also confirms attendance at a mandatory or recommended site visit, which may be a prerequisite for bidding.

Questions & Answers / Clarifications

This document provides responses to Requests for Information (RFIs) 1-4 related to the solicitation.

• Performance Periods: The overall 90-calendar-day period of performance takes precedence over the 60-day periods listed for individual projects within the SOWs.
• Wage Determination: Bidders should refer to the attached Davis Bacon Wage Rates for Thomas Stone (Attachment 5) and use the appropriate state and county rates. A separate full wage determination document will not be provided.
• Pricing Submission: Two lump-sum CLINs are sufficient for pricing submission under Section B. A detailed breakdown of costs is unnecessary.
• Warranty Period: The 2-year warranty period takes precedence over the one-year warranty language referenced in the SOW for the GEWA scope.

These clarifications provide specific guidance on performance periods, wage rate application, pricing structure, and warranty terms, which bidders should incorporate into their proposals.

Form / Attachment / Pricing Sheet

This document contains construction drawings and details for the Thomas Stone National Historic Site Comfort Station project. It provides architectural and structural information necessary for the construction of the facility.

• Floor Plan: Shows the layout of the building, including dimensions and placement of structural elements.
• Roof Framing Plan: Details the structure of the roof.
• Wall Plans: Illustrates the top of the wall framing.
• Details: Includes specific construction details for corners, walls, toilets, trusses, and steel beam/post connections.
• General Notes: Outlines design loads (wind, snow), concrete specifications, steel treatment (galvanizing, priming, painting), and wood construction requirements (steel plates, bolts, decking).
• List of Abbreviations: Defines common abbreviations used in the drawings.

These drawings are critical for bidders to understand the physical scope, structural requirements, and material specifications of the project. They are essential for accurate bidding, material procurement, and construction planning.

Form / Attachment / Pricing Sheet

This document contains architectural drawings and plans related to the "THST Visitor Center Renovation" opportunity. It includes roof demolition plans, roof plans, and elevations for additions to the Visitor Contact Station at the Thomas Stone National Historic Site.

• Roof Demolition Plan (A2): Details existing metal roof panels, gutters, and downspouts to be removed.
• Roof Plan (A2): Shows new metal roofing, gutters, and drainage slopes for the Visitor Contact Center.
• Elevations (A3, A4): Illustrate the exterior views of the existing Visitor Contact Station and its additions, including new metal roofs, painted rough-sawn wood elements (fascia, battens, 4x6s), new gutters, and downspouts.
• Building Section (A4): Provides a cross-section view of the additions, showing roof trusses, ceiling details, and concrete elements.

These drawings are critical for understanding the physical scope of the renovation work, including demolition and new construction elements for the roofing and exterior of the Visitor Contact Station. Bidders should use these plans to assess material requirements, labor, and the overall complexity of the renovation project.

Form / Attachment / Pricing Sheet

This document contains photographs of the THST Visitor Center and surrounding grounds. It appears to be an attachment providing visual context for a potential maintenance or repair opportunity, likely related to the visitor center's roof and exterior.

• Exterior Views: Multiple images show the front, south oblique, and north oblique views of the THST Visitor Center building.
• Aerial View: An aerial photograph indicates the location of the THST Visitor Center (THST VC) and the THST House on the property.
• Roof Details: Close-up images show the condition of a flat roof area at the back of the building, including debris and standing water, as well as the condition of the metal roofing panels.

These photographs provide visual information about the physical condition and location of the THST Visitor Center. Bidders should review these images to understand the scope of work related to any potential roofing, exterior maintenance, or general facility upkeep requirements associated with this opportunity.

Form / Attachment / Pricing Sheet

This document is a Davis-Bacon Act wage determination for building construction in Charles County, Maryland. It specifies the prevailing wage rates and fringe benefits for various construction trades.

• General Decision Number: MD20260113
• Publication Date: 01/02/2026
• State: Maryland
• County: Charles County
• Construction Type: Building
• Lists specific trades (e.g., Bricklayer, Carpenter, Electrician, Laborer, Painter, Plumber) with their corresponding hourly wage rates and fringe benefits.
• Includes notes on Executive Orders 13706 (Paid Sick Leave) and 13658 (Minimum Wage for Federal Contractors), outlining contractor obligations.
• Provides information on union rate identifiers, survey rate identifiers, and state-adopted rate identifiers.
• Outlines the Wage Determination Appeals Process.

Bidders must use these wage rates to ensure compliance with labor standards for any construction work performed under this contract. The rates listed are the minimum required for covered workers and will impact labor cost calculations in proposals.

Statement of Work (SOW)

To repair deteriorating mortar joints on the exterior brick surfaces of the Memorial House Museum (MHM) and the Colonial Revival Kitchen (CRK) at George Washington Birthplace National Monument, and to install new half-round copper gutters and downspouts on both buildings.

• Repointing Brickwork: Analyze mortar samples to determine the original mix, develop a matching mortar, and provide mockups for approval. Clean brick surfaces using D/2 Biological Solution. Remove deteriorated mortar joints by hand tools only. Repoint joints using an approved Lime-Based Mortar. Protect adjacent materials and ensure worker safety. No pressure washers are allowed for cleaning.

• Gutter Installation: Install new 20 oz. copper, 6-inch seamless half-round gutters and 3-inch plain round downspouts on both buildings. Gutters will be pitched from the center to drain at both ends. Downspouts will be attached to outlets with a watertight fit and secured with copper straps. All joints and connections will be soldered. The system will be tested for proper flow and drainage away from the foundation.

• General Requirements: Maintain public access to buildings, perform daily site clean-up and debris disposal. Work hours are Monday-Friday, 7 am to 3:30 pm. The period of performance is 60 calendar days after Notice to Proceed.

• Mortar mix must match the prevalent mortar in color and texture.

• Gutter and downspout installation must ensure a watertight fit and proper drainage.

• Work must comply with OSHA regulations for scaffolding and ladders.

• A one-year on-call warranty for all work performed is required, with a two-year warranty against defects in materials and workmanship.

• Period: 60 calendar days after Notice to Proceed.

• Place: George Washington Birthplace National Monument, 1732 Popes Creek Road, Colonial Beach, VA 22443.

• Experience: Bidders must provide evidence of 5 years of past experience in masonry trade and gutter/downspout installation.

• Site Visit: Prospective bidders are strongly encouraged to attend a pre-bid site visit.

• Submittals: Include Construction Schedule, Breakdown of Schedule of Values, Accident Prevention/Safety Plan, Project Superintendent designation, Subcontractor list, and Product/Materials list prior to the pre-construction conference.

• Safety: An Accident Prevention Plan must be submitted. Appropriate PPE is required for all workers. Maintain an updated first aid kit on site.

Solicitation / RFP / RFQ

This solicitation is a Request for Proposal (RFP) for construction services at George Washington Birthplace National Monument (GEWA) and Thomas Stone National Historic Site (THST). The work involves repairing deteriorating mortar joints on the exterior brick surfaces of the Memorial House (MHM) and Colonial Kitchen (CRK) buildings at GEWA, and installing a new vertical seam metal roofing system and seamless gutters at the Visitor's Center at THST. This requirement is being solicited as a Service-Disabled Veteran-Owned Small Business Set Aside.

• GEWA: Repointing of brick and installation of gutters.

• THST: Installation of a metal standing seam roof and gutters.

• Detailed specifications and drawings are provided.

• Estimated Magnitude: Between $250,000.00 and $500,000.00.

• Contract Type: Firm Fixed Price.

• Period of Performance: 90 calendar days from Notice to Proceed.

• Performance Start: Within 10 calendar days of Notice to Proceed.

• Proposal Due Date: June 12, 2026, at 12:00 PM local time.

• Submission Method: Via email to Samuel_McKenzie@ios.doi.gov.

• Evaluation: Best Value Continuum Tradeoff Process. Proposals will be evaluated on technical approach, schedule, key personnel experience, past performance, and price. Technical factors are of equal importance, and price is also a significant evaluation factor.

• Service-Disabled Veteran-Owned Small Business Set Aside.

• NAICS Code: 238160 – Roofing Contractors.

• Small Business Size Standard: $19M.

• A site visit is scheduled for May 6, 2026. Participants will meet at the George Washington Birthplace Visitor Center at 9:00 AM ET, and then proceed to the Thomas Stone NHS Visitors Center at approximately 11:00 AM ET.

• Offerors must be registered in the System for Award Management (SAM.gov).

Form / Attachment / Pricing Sheet

This document provides information regarding Construction Contract Administration, specifically referencing Federal Acquisition Regulation (FAR) 36.211(b). It outlines the requirement for agencies to describe policies and procedures related to the definitization of equitable adjustments for change orders under construction contracts, as well as the time required for this process.

• Reference to FAR 36.211(b)
• Requirement for agencies to describe policies and procedures for definitizing equitable adjustments for change orders.
• Requirement for agencies to provide data on the time needed to definitize equitable adjustments.
• A URL is provided for further information: https://www.doi.gov/pam/acquisition/policy/constructioncontract.

This document serves as an informational attachment that may be relevant to bidders interested in construction contracts. It highlights regulatory requirements concerning contract administration, specifically change order adjustments, which could impact contract terms and processes. Bidders may find the provided URL useful for understanding agency policies in this area.

Statement of Work (SOW)

To replace the existing exposed-fastener corrugated metal roof and install new seamless gutters and downspouts on the Thomas Stone National Historic Site (THST) visitor center building.

• Remove and dispose of the existing metal roof, underlayment, damaged sheathing boards, and associated flashing.

• Inspect and replace damaged roof decking (sheathing boards) as needed.

• Install a new "Vertical Seam" snap seam metal roofing system.

• Install high-temperature resistance self-adhered membrane underlayment.

• Install "K-Style" seamless gutters and downspouts.

• Increase the pitch of two flat roof sections by framing and installing 5/8-inch CDX plywood sheathing.

• Install snow guards.

• Install colored EPDM pipe boot flashings.

• Maintain public access to the visitor center during demolition and installation.

• Perform daily site clean-up and debris disposal.

• The new "Vertical Seam" standing seam metal roof system must be installed according to the manufacturer's specifications.

• Underlayment must be high-temperature resistant (minimum 240° F), minimum 40 mil thickness, smooth surfaced, and approved for use under metal roofing.

• Snow guards must be installed in a staggered pattern.

• Gutters and downspouts must meet specified dimensions and color.

• A two-year on-call basis warranty for all work performed, covering defects in materials and workmanship.

• The painted finish on the Snap Seam metal roofing has a 50-year paint warranty.

• Location: Thomas Stone NHS, 6655 Rose Hill Road, Port Tobacco, Maryland 20677.

• Period of Performance: 60 calendar days after Notice to Proceed is issued.

• Regular Working Hours: Monday through Friday, 7:00 AM to 3:30 PM. No work on Saturdays, Sundays, or federal holidays without authorization.

• Contractor must provide evidence of past work experience installing standing seam metal roofing.

• Contractor must establish and maintain a Quality Control Plan.

• Workers must present themselves professionally.

• No smoking in park-owned facilities (designated smoking area will be provided).

• Site visit is strongly encouraged.

• Contractor is responsible for staging, storage, and disposal of all materials and debris.

• Protect park facilities from damage.

• Submit a Construction Schedule, Schedule of Values, Accident Prevention/Safety Plan, Project Superintendent designation, List of Subcontractors, and Product and Materials at least 10 days prior to the preconstruction conference.

Form / Attachment / Pricing Sheet

This document is a General Decision Number (GDN) for wage determinations under the Davis-Bacon Act. It specifies the prevailing wage rates and fringe benefits that must be paid to various construction laborers and mechanics employed on building construction projects in specific counties within Virginia. This information is crucial for contractors to understand labor costs and ensure compliance with federal regulations.

• General Decision Number: VA20260007
• Publication Date: 01/02/2026
• Applicable Counties: Accomack, Essex, King And Queen, King George, Lancaster, Middlesex, Northampton, Northumberland, Richmond, and Westmoreland Counties in Virginia.
• Construction Type: Building (does not include single-family homes or apartments up to and including 4 stories).
• Specific Wage Rates and Fringe Benefits: Detailed rates are provided for various classifications, including:
  • Asbestos Worker/Heat & Frost Insulator
  • Electrician
  • Elevator Mechanic
  • Power Equipment Operator (Bulldozer)
  • Pipefitter (Includes HVAC Unit Installation)
  • Carpenter
  • Laborer (Common or General)
  • Operator (Backhoe/Excavator/Trackhoe)
  • Plumber
  • Roofer
  • Sheet Metal Worker (HVAC Duct Installation Only)
  • Truck Driver (Dump Truck)
• Paid Holidays: Specific holidays are listed for certain classifications.
• Vacation Pay: Details on vacation pay credit based on service length.
• Executive Orders: Notes on the applicability of Executive Order 13706 (Paid Sick Leave) and Executive Order 13658 (Minimum Wage).

Bidders must use these wage rates to accurately estimate labor costs for their proposals. Failure to comply with these prevailing wage requirements can lead to contract violations. The document also outlines the process for wage determination appeals and conformance.