16. Architects, mechanical engineers, electrical engineers, civil and structural engineers, architectural project coordinators, mechanical project coordinators and electrical project coordinators are authorized to sign(1) contracts for professional services where the amount is less than $10,000;
(2) contracts for services other than professional services where the amount is less than $50,000; and
(3) orders for changes and riders to contracts for services other than professional services where the amount is less than $5,000, and to contracts for professional services where the amount is less than $1,000.