THIS IS A SOURCES SOUGHT NOTICE: For market research purposes only. This is not a Request for Proposal (RFP) or a solicitation for a contract. In accordance with FAR 15.201(e), responses to this notice are not offers and cannot be accepted by the Government to form a binding contract. The Government will not pay for any information submitted, nor will it reimburse any administrative or preparation costs incurred by respondents. All costs associated with responding to this Sources Sought will be solely at the responding party's expense. Not responding to this notice does not preclude participation in any future RFP, if issued. Department of Energy / National Nuclear Security Administration (NNSA) Defense Nuclear Nonproliferation (DNN) and Nevada Field Office (NFO) Project Title: Technical Research, Engineering, and Development Services (TREDS) III. NAICS Code: 541715 – Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) Product Service Code (PSC): AC22 – National Defense R&D Services; Atomic energy defense activities; Applied Research. . Background & Objective The National Nuclear Security Administration (NNSA) Nevada Field Office (NFO) and the Office of Defense Nuclear Nonproliferation (DNN) are seeking capability statements from qualified and capable sources to provide technical research, engineering, development, and operational support under the TREDS III program. The scope of this requirement covers technical domains in environment, safety, and health; national security; and environmental restoration and waste management. Work will be executed at the Nevada National Security Site (NNSS), the Nevada Test and Training Range (NTTR), including the Tonopah Test Range (TTR), and at over 24 community environmental monitoring locations throughout Nevada, Utah, and California. The anticipated contract structure will have a performance period of up to 10 years, commencing from the date of contract award. This includes a 2-year base period and 4 subsequent 2-year option periods. High-Level Requirements (HLRs) Interested parties must demonstrate capabilities in the following core technical and administrative areas: •HLR 1: Security, FOCI, and Clearance Compliance: The ability to maintain a Department of Energy (DOE) Facility Clearance, comply with Foreign Ownership, Control, or Influence (FOCI) requirements, and provide personnel with active DOE "Q" clearances (or equivalent Top Secret clearance eligible for immediate reciprocity) prior to award. •HLR 2: Multi-State Field Operations: Logistical, equipment, and mobile staffing capability to support on-site scientific field operations, instrument maintenance, and environmental sampling across multiple states (NV, UT, CA). •HLR 3: Hydrologic Modeling and Regulatory Closure Support: Experience conducting groundwater, vadose zone, and surface water hydrological evaluations, including modeling and forecasting of radionuclide contaminant transport r…