The USGS Florence Bascom Geoscience Center seeks a five-year Blanket Purchase Agreement (BPA) for geological sample analysis, including geochemical, mineralogical, and isotopic analyses. The laboratory must hold ISO/IEC 17025:2017 accreditation (with ISO 9001:2015/9002 specifications). This is a total small business set-aside under NAICS 541380 with a $19.5 million size standard, and the contractor must be registered in SAM.gov. Calls will be fixed-price with bidding at a unit price per sample, with cumulative charges not to exceed $200,000 over the five-year period; no funds are obligated for the BPA itself. Quotes must be emailed to the agency.