The Department of Energy is soliciting proposals for the design and construction of the PNNL Stable Isotope Science and Engineering Laboratory in Richland, Washington. This competitive Request for Proposal (RFP) seeks qualified contractors to undertake a design/build effort that aligns with federal objectives and local needs, emphasizing the importance of detailed project proposals. The laboratory will play a crucial role in advancing research and development in stable isotope science, which is vital for various applications in energy and environmental sectors. Interested parties should contact Garrett V Hyatt at garrett.hyatt@pnnl.gov or call 509-375-7591 for further details, and all proposal submissions must adhere to the guidelines outlined in the attached RFP document.