18. Development directors, the expertise and project management support director, project management directors and the planning and expertise director are authorized to sign(1) construction contracts and contracts for services other than professional services where the amount is less than $500,000;
(2) deeds of receipt of a work concerning a contract where the amount is less than $500,000;
(3) supply contracts where the amount is less than $100,000;
(4) contracts for professional services where the amount is less than $100,000; and
(5) orders for changes and riders to construction contracts and contracts for services other than professional services where the amount is less than $50,000, and to contracts for professional services and supply contracts where the amount is less than $10,000.