Under T.C.A. § 12-4-113 (formerly § 12-4-126), no addendum to the bid documents is permitted within less than forty-eight (48) hours of the bid opening date, excluding weekends and legal holidays designated in § 15–1–101, unless the bid deadline is extended for a reasonable time as determined by the purchasing agent, which shall not be less than forty-eight (48) hours excluding weekends and legal holidays designated in § 15–1–101, to allow for any necessary changes to the bid documents and to allow bidders to resubmit their bids if necessary.  Any questions concerning the bid documents must be received by the designer no less than ninety-six (96) hours before bid opening date.  These provisions do not apply to contracts funded in whole or in part with state or federal highway funds.