24. SUBJECT: TUNNEL ADVISORY PANEL AUTHORIZE the Chief Executive Officer to: A. Execute Contract Modification No. 11 to Contract No. PS-2020-1055 with Dr. Geoffrey R. Martin for the continuation of Tunnel Advisory Panel Services, in an amount not-to-exceed $910,475, increasing the total contract value from $2,090,006 to $3,000,481 and extend the contract from July 1, 2020 to June 30, 2023; B. Execute Contract Modification No. 6 to Contract No. PS-8510-2493 with Dr. Edward J. Cording, for the continuation of Tunnel Advisory Panel Services, in an amount not-to-exceed $923,457, increasing the total contract value from $2,075,778 to $2,999,235 and extend the contract from July 1, 2020 to June 30, 2023; and C. Negotiate and Execute sole source Contract No. PS-1620-1000, with Dr. Thomas O'Rourke, for Tunnel Advisory Panel Services, in an amount not-to-exceed $947,457, from June 1, 2020 to June 30, 2023.