The U.S. Geological Survey awarded a purchase order to Southwest Research Institute valued at $60,000.00 on September 23, 2026, for high-performance liquid chromatography validation services. Place of performance is San Antonio, Texas. The order calls for validation of an antimycin A HPLC-DAD instrument method and creation of four separate antimycin A homolog standard calibration curves following Good Laboratory Practice protocols over a 90-day period of performance. An optional line item authorizes method validation application to quantify antimycin A homologs in four different sample types under a USGS-coordinated study protocol. The requirement originated from a full and open competitive solicitation posted September 16, 2026, with quotations due September 21, 2026, under NAICS 541380 (Testing Laboratories and Services) and PSC B516. Evaluation criteria carried equal weight on qualifications, past performance (minimum three HPLC analytic method validation projects within three years with FDA or EPA experience required), and price.