# Upgrade Sanitary and Storm Systems at the National Museum of Natural History Canonical: https://abierto.us/opportunities/33330226rf0010002 - Solicitation number: 33330226RF0010002 - Notice type: Solicitation (first published as presolicitation) - Status: Closed. Deadline was June 3, 2026 at 3:00 PM EDT - Department: Smithsonian Institution - Contracting office: Smithsonian Institution (333302) - NAICS: 236220 Commercial and Institutional Building Construction - Product or service code: Y1JA Construction Of Museums And Exhibition Buildings - Place of performance: District of Columbia - County: District of Columbia (FIPS 11001). https://abierto.us/counties/district-of-columbia-dc-11001 - First posted: February 20, 2026 - Last posted: May 14, 2026 - SAM.gov: https://sam.gov/workspace/contract/opp/19b29af3d3bf4e5cb754d96ab7e7837e/view ## Description Amendment 0005 to the RFP is hereby issued and attached for download. The purpose of the amendment is to make the following changes to the Solicitation: Responses to RFIs for Questions 76-82 Addendum #1 Bid Due Date Extension Amendment 0004 to the RFP is hereby issued and attached for download. The purpose of the amendment is to make the following change to the Solicitation: Presentation Slides Amendment 0003 to the RFP is hereby issued and attached for download. The purpose of the amendment is to make the following changes to the Solicitation: Responses to RFI’s for Questions 1-75 Updated Multi-Year Document Amendment 0002 to the RFP is hereby issued and attached for download. The purpose of the amendment is to make the following changes to the Solicitation: 2nd Site Visit RFI Due Date Extension Bid Due Date Extension Amendment 0001 to the RFP is hereby issued and attached for download. The purpose of the amendment is to make the following change to the Solicitation: 03/27 Site Visit Sign-in Sheet The Smithsonian Institution is seeking offers to upgrade Sanitary and Storm Systems project at the Smithsonian Institution's National Museum of Natural History located at 10th Street and Constitution Avenue NW, Washington, DC, as described herein and the Contract Documents, including, without limitation, in the Specifications and Drawings for SF Project No. 1600103 both dated December 5, 2025. All of the requirements which the successful Offeror must meet concerning this project are set forth in detail in the solicitation Documents included with this Request for Proposal. Upon receipt of Technical and Cost Proposals and the selection of a successful Offeror, the Smithsonian Institution will execute a Fixed Price construction contract. The Smithsonian currently estimates that the fixed price for the entire project will exceed $10 Million. The scope of this project includes the installation of a new sanitary and stormwater system throughout the Museum Main Building, East and West Wings to replace the existing infrastructure that has reached the end of its service life. Work must be executed with extreme care to protect the museum’s collections, exhibits, and research operations, and preserve its historic architecture features. The major elements of work include, but are not limited to, the following: Installation of new sanitary and stormwater piping systems through the Main Building, East and West Wings in accordance with construction documents. Rerouting stormwater and sanitary piping where possible to avoid passage through the ceiling of exhibit halls, collection storage areas, and other sensitive or restricted spaces. Capping off abandoned piping, where feasible, isolating it from active systems and preventing future infiltration or structural compromise. Removal and disposal of old piping where capping is not feasible, in compliance with environmental regulations and structural safety standards. Lead and asbestos abatement, as necessary, in areas affected by demolition or pipe removal, in accordance with applicable EPA, OSHA, DOT, District of Columbia law and regulations and others as cited in the specification. Installation of new sanitary and storm piping within the existing tunnel system, including structural support, penetrations, and insulation where required. Tie-in of new systems to the existing SI stormwater and sanitary infrastructure external to the building, with proper alignment, connection materials, and testing. Develop and implement a comprehensive erosion and sediment control plan in compliance with EPA Construction General Permit and District of Columbia regulations. Inspect, remove and replace roof scuppers including sealing and integration with the building stormwater management system to restore proper drainage performance. All work must be conducted in accordance with applicable codes, historic preservation requirements, safety regulations, and Smithsonian Institution design and construction standards. Phasing plans must minimize disruption to ongoing museum operations, protect the public, and preserve the integrity of historic and scientific assets. PRE-BID TOUR OF THE SITE The Pre-proposal meeting is scheduled for Friday, March 27, 2026, at 9:00 AM Eastern Time. REQUEST FOR CLARIFICATIONS It is requested that all questions be sent in no later than April 14, 2026. THE PROPOSAL DUE DATE IS TUESDAY, MAY 12, 2026, at 3:00 PM EASTERN STANDARD TIME (EST). The subcontracting goals for this project are: 40% with small business concerns. At least 7% with Service-Disabled Veteran-owned small businesses (SDV). Davis Bacon Building Wage Determination DC20260002 shall apply. The Period of Performance for the Base Contract and Options 1-3, if exercised, is 740 Calendar Days from the date of Notice to Proceed. ## Publications - February 20, 2026: Presolicitation. Notice 71e593271c52429e9ed018da49afadec. https://sam.gov/workspace/contract/opp/71e593271c52429e9ed018da49afadec/view - February 20, 2026: Presolicitation. Notice 85e7d813bb344bf59fec90ac56e2dbcc. https://sam.gov/workspace/contract/opp/85e7d813bb344bf59fec90ac56e2dbcc/view - March 12, 2026: Solicitation, due May 12, 2026 at 3:00 PM EDT. Notice 6c747abf197b44d6a77f634681c5a389. https://sam.gov/workspace/contract/opp/6c747abf197b44d6a77f634681c5a389/view - April 2, 2026: Solicitation, due May 12, 2026 at 3:00 PM EDT. Notice b07dcb24f13242788352a09b33825667. https://sam.gov/workspace/contract/opp/b07dcb24f13242788352a09b33825667/view - April 21, 2026: Solicitation, due May 20, 2026 at 3:00 PM EDT. Notice 550b7638a6d04a43971f2541e7113f5d. https://sam.gov/workspace/contract/opp/550b7638a6d04a43971f2541e7113f5d/view - April 28, 2026: Solicitation, due May 20, 2026 at 3:00 PM EDT. Notice ce4c4b6bdfb84efa9905cc814d45dcff. https://sam.gov/workspace/contract/opp/ce4c4b6bdfb84efa9905cc814d45dcff/view - May 7, 2026: Solicitation, due May 20, 2026 at 3:00 PM EDT. Notice 71e34bf1f66243aca63cc863030a0288. https://sam.gov/workspace/contract/opp/71e34bf1f66243aca63cc863030a0288/view - May 14, 2026: Solicitation, due June 3, 2026 at 3:00 PM EDT. Notice 19b29af3d3bf4e5cb754d96ab7e7837e. https://sam.gov/workspace/contract/opp/19b29af3d3bf4e5cb754d96ab7e7837e/view ## Points of contact - Virginia Chan, Chanvc@si.edu - Christine Grant, grantCA@si.edu --- Source: SAM.gov Contract Opportunities bulk extract. Confirm deadlines on SAM.gov before responding. Cite https://abierto.us/opportunities/33330226rf0010002.