This MOU shall be reviewed and updated no later than five years from the adoption date. TxDOT and TCEQ by rule shall adopt the MOU and all revisions to the MOU. If a change in state or federal law or a change in the SIP necessitates a change in this MOU, or if the parties agree that there has been a significant increase in the number of transportation projects requiring TxDOT to coordinate with TCEQ, then representatives from both TxDOT and TCEQ will meet to work out a mutually agreeable amendment to the MOU.