The National Park Service, Contracting Operations East, New England Major Acquisition Buying Office, issues this Request for Proposal (RFP) for a construction requirement at Assateague Island National Seashore in Berlin, Maryland. Work will consist of furnishing all labor, supervision, materials, tools, supplies, transportation, license, certificates, permits, personal protection equipment, professional services, and equipment as required to rehabilitate the MD Developed Zone water distribution system as detailed in the Scope of Work, drawings and Specifications, included with the solicitation documents. Provisions and clauses - 04/17/2026 Attachment 1 - Construction Drawings - 04/17/2026 Attachment 2 - Construction Specifications - 04/17/2026 Attachment 3 - Specification 13 34 00 Supplement - 04/17/2026 Attachment 4 - Supplemental Statement of Work - 04/17/2026 Attachment 5 - General Specifications - Island Water Pumphouse - 04/17/2026 Attachment 6 - Construction Wage Decision MD20260128 - 01/02/2026 Attachment 7 - Limitations on Subcontracting Report Template - 04/17/2026 Attachment 8 - Construction Contract Administration - 04/17/2026 An organized site visit has been scheduled for May 14, 2026, at 11:00 am ET. Participants will meet at 6633 Bayberry Drive, Berlin, MD 21811. AMENDMENT 0001: The purpose of this amendment is to provide a response to all questions received, provide the list of attendees to the organized pre-bid site-visit, provide additional supplemental information based on questions received, provide revised drawings, specifications, and supplemental SOW based on questions received and clarifications provided, provide the updated DOL Wage Determination dated 05/18/2026, and to extend the date for receipt of offers. Therefore: 1. A response to all questions received is incorporated into this Amendment. 2. A list of attendees to the pre-bid site-visit is attached. 3. Attachment 9 - Island Pumphouse Well Control Photos is attached. 4. Attachment 10 - Island Well Pumps Specifications is attached. 5. Attachment 11 - HPDE Fusible Valve Examples is attached. 6. Attachment 12 - Construction Drawings (Revised 5.28.26) is attached. 7. Attachment 13 - Construction Specification (Revised 5.29.26) is attached. 8. Attachment 14 - Supplemental SOW (Revised 5.28.26) is attached. 9. Attachment 15_DOL Wage Determination MD20260128 (Revised 5.18.26) is attached. 10. The hour and date for receipt of offers is extended to 10:00 am EDT on June 17, 2026.