In addition to the exemptions from licensure in Section 58-1-307, the following may engage in the stated limited acts or practices without being licensed under this chapter:
(1) a person preparing a site plan as defined in Subsection 58-53-102(3), for a one-, two-, three-, or four-family residence not exceeding two stories in height, exclusive of the basement;
(2) a person designing sprinkler irrigation systems when licensed as a landscape contractor under Title 58, Chapter 55, Utah Construction Trades Licensing Act;
(3) a person licensed to practice professional engineering or professional structural engineering under Title 58, Chapter 22, Professional Engineers and Professional Land Surveyors Licensing Act;
(4) a person licensed to practice architecture under Title 58, Chapter 3a, Architects Licensing Act;
(5) unlicensed employees of a person licensed under this chapter while preparing site plans as defined in Subsection 58-53-102(3), under the supervision of a landscape architect; and
(6) an organization engaged in the practice of landscape architecture, provided that:
(a) the organization employs a principal; and
(b) all individuals employed by the organization, who are engaged in the practice of landscape architecture, are licensed or exempt from licensure under this chapter.