The U.S. Geological Survey requires commercial services to validate the antimycin A (ANT) high-performance liquid chromatography (HPLC) method per the attached Statement of Work. This full and open competition will result in a firm-fixed-price contract awarded on a best-value basis. Evaluation factors are qualification, past performance, and price, with technical approach, experience, and past performance combined significantly more important than price. Performance will occur at an independent laboratory, and the period of performance is 90 days from the signed purchase order. The applicable NAICS code is 541380, Testing Laboratories and Services, with a $19 million small business size standard.