(a) Except as provided in § 4–409 of this subtitle, this subtitle does not apply to any public improvement made by: (1) the Department of Transportation or a unit in that Department; (2) any housing authority created under Division II of the Housing and Community Development Article; (3) the Maryland–National Capital Park and Planning Commission; (4) the Washington Suburban Sanitary Commission; (5) the Baltimore County Metropolitan District; (6) a county, municipal corporation, or unit of a county or municipal corporation; (7) the University System of Maryland; (8) Morgan State University; (9) St. Mary’s College of Maryland; or (10) Baltimore City Community College, if the value of the contract for the public improvement is $500,000 or less. (b) The Board of Public Works may exempt specific projects of a unit of the State government from the provisions of this subtitle. (c) The Board of Public Works shall adopt regulations in accordance with Title 10, Subtitle 1 of the State Government Article establishing procedures for the exemption of specific projects of units of State government under subsection (b) of this section.