This chapter must not be construed to prevent or affect:

1. (1) the work of an employee or subordinate of a person licensed pursuant to this chapter or an employee of a person practicing lawfully pursuant to this chapter, if the work does not include final soil classifying decisions and is done under the direct supervision of and verified by a person licensed pursuant to this chapter or a person practicing lawfully pursuant to this chapter;
2. (2) the practice of any other legally recognized profession or trade;
3. (3) the practice of soil classifying by a person who is regularly employed to perform soil classifying services solely for his employer or for a subsidiary or affiliated corporation of his employer, if the soil classifying is performed on the real property of his employer.