The USGS Florence Bascom Geoscience Center seeks to establish a 5-year Blanket Purchase Agreement (BPA), with no option periods and no guaranteed minimum or maximum order quantities, for laboratory analysis of geologic samples including geochemical, mineralogical, and isotopic analyses. The lab must be registered to ISO/IEC 17025:2017 and associated ISO quality standards. Calls will be made as needed under fixed-price contracts, with total charges not to exceed $200,000 over the five-year period, and contractors should bid on a per-sample unit price basis. No funds are obligated under the BPA itself; all obligations occur through individual calls. This opportunity is a total small business set-aside under NAICS 541380 with a $19.5 million size standard, and vendors must be registered in SAM.gov to be eligible.