This is a sources sought notice to determine firms capable of providing geotechnical engineering services under an indefinite delivery indefinite quantity contract for the US Army Corps of Engineers. Work will primarily occur through the Huntington District, with assignments across the Great Lakes and Ohio River Division, including Buffalo, Chicago, Detroit, Huntington, Louisville, Nashville, and Pittsburgh Districts. Services include geotechnical investigations, subsurface drilling, seepage and dam stability analysis, instrumentation, and laboratory testing, among related activities. The contract capacity is up to approximately $2,500,000 per year. Interested firms must demonstrate qualifications, relevant experience, and professional registration, with responses limited to 15 pages.