Yes, you have obligations under Davis-Bacon and Related Acts.  There are wage and benefit rates listed on the general Davis-Bacon wage decision, you must pay no less than the rate for the lowest specialized trade that most closely resembles the trade in question.  For example, if you are a plumbing contractor and plumbers aren’t listed on the wage decision, you would need to find another specialized trade and must not pay lower than that trade’s prevailing wage.  Let’s say that as a plumbing contractor you chose carpentry.  If the special determination is provided, and the carpentry trade is actually lower than what was decided upon, you would need to correct your payroll accordingly.