The U.S. Geological Survey (USGS) intends to award a contract to Hamilton Analytical Lab for the analysis of rock samples, specifically focusing on the Miocene Columbia River Basalt Group (CRBG) in the Pacific Northwest. The contract will involve the chemical analysis of 200 samples in 2025, with an option for an additional 100 samples in 2026, utilizing the X-ray fluorescence method to measure at least 29 major and trace elements, ensuring results are consistent with decades of USGS standards. This analysis is crucial for enhancing geological mapping efforts and understanding regional geologic history and water resource management. Interested parties may submit inquiries via email to Ruperto Lujan at rlujan@usgs.gov, with responses due by December 24, 2024, at 0800 hrs central; no solicitation will be issued, and the contract is expected to span from January 2025 to December 2026.