Section 5-18B-19 - Amendment or change order to existing contractAny amendment or change order to an existing contract for construction, reconstruction, or remodeling of a public improvement does not need to be bid if:
(1) The contract contains unit prices for the same type or class of work;(2) The change or extra work is necessitated by circumstances related to soils, utilities, or unknown conditions directly affecting the performance of the work that were not reasonably foreseeable at the time the underlying contract was let and the change or extra work is necessary to the completion of the public improvement; or(3) The sum of the proposed amendment or change order plus the sum of all other prior unbid amendments or change orders, exclusive of change orders issued under subdivisions (1) and (2) of this section, does not exceed the following:(a) For contracts not more than five hundred thousand dollars, the greater of twenty-five thousand dollars or fifteen percent of the base contract;(b) For contracts exceeding five hundred thousand dollars but not more than two million five hundred thousand dollars, the greater of seventy-five thousand dollars or ten percent of the base contract; and(c) For contracts exceeding two million five hundred thousand dollars, the greater of two hundred fifty thousand dollars or five percent of the base contract.