12. A project coordinator of the branch responsible for infrastructures is authorized to sign, for the projects,(1) supply contracts, services contracts and construction contracts below the public tender threshold for supply 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 and up to a total amount of additional expenditures below the public tender threshold for supply contracts, but an amount less than $10,000 per amendment; and
(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,(a) up to a total amount of any additional expenditures below the public tender threshold for supply contracts, but an amount less than $10,000 per amendment; and
(b) the total value of the contract, including any additional expenditures, below the public tender threshold applicable to the contract.