This is a sources sought notice for market research, not a solicitation, seeking contractors to perform annual transformer oil sampling and analysis at Bonneville Lock and Dam in Oregon. The contract is a firm fixed-price, performance-based service contract with a 12-month base year plus four optional years, anticipated to run from July 1 through June 30. The contractor must provide all personnel, equipment, and materials to sample and analyze oil using specified ASTM methods, with results due within 30 days of sampling. The laboratory must participate in ASTM’s semi-annual Proficiency Testing Program and maintain acceptable historical z-scores. Responses are due by May 20, 2026, at 10:00 PM PDT.