5. The director of capital assets and material resources is authorized to sign the following documents up to the amount specified:
(1) supply contracts and contracts for the purchase or rental of immovables for a total of less than $50,000;
(2) construction contracts for a total of less than $100,000 and orders for changes to construction contracts for less than $10,000;
(3) professional or auxiliary services contracts for a total of less than $50,000;
(4) contracts for the alienation of movables for less than $5,000.