10. The director responsible for infrastructures is authorized to sign, for the branch,(1) supply contracts, services contracts, construction contracts and immovable leases below the public tender threshold for services contracts;
(2) an amendment, that entails or not an additional expenditure, to a contract involving an expenditure equal to or above the public tender threshold applicable to the contract and whose total additional expenditures, if any, is less than 10% of the initial amount of the contract;
(3) an amendment, that entails or not an additional expenditure, to a contract involving an expenditure below the public tender threshold applicable to the contract and whose total value of the contract, including any additional expenditures, is below the public tender threshold; and
(4) contracts for the alienation of assets where the estimated market value of the property at the time of the alienation is less than $25,000.