Texas Transportation Code ch. 223, subch. D, provides for the procurement of technical experts to perform scientific services for TxDOT. The Environmental Affairs Division (ENV) has implemented procedures for selecting scientific experts under 43 Texas Administrative Code (TAC) ch. 9, subch. F, which allows TxDOT to select technical experts through the use of competitive sealed proposals. This is a procurement process that requires TxDOT to select a technical expert based upon the reasonableness of fees and qualifications to perform the required work or services.