As part of the OIG's annual audit plan, we audited costs billed to the Tennessee Valley Authority (TVA) by Geosyntec Consultants, Inc., for professional environmental services under Contract No. 00050771. Our audit included $6 million in costs paid by TVA between November 14, 2011, and May 1, 2014. Our objective was to determine if the costs billed to TVA were in compliance with the contract terms and conditions. In summary, we determined Geosyntec overbilled TVA $162,307, including (1) $95,425 in travel costs and (2) $66,882 in miscellaneous expenses.