(a) Unless the contracting officer determines that the criteria for set-aside cannot be met, set aside for small business concerns acquisitions for—
(i) Construction, including maintenance and repairs, under $2.5 million;
(ii) Dredging under $1.5 million; and
(iii) Architect-engineer services for military construction or family housing projects under $1 million (10 U.S.C. 2855).