The following persons shall be exempt from the provisions of this chapter:

(1) Any person not a resident of and having no established place of business in this state, practicing or offering to practice herein the profession of soil classifier when such practice does not exceed a total of 30 days in any calendar year, provided such person is legally qualified by registration to practice the profession in his or her own state or country in which the requirements and qualifications for obtaining registration are not lower than those specified in this chapter.

(2) Any person not a resident of and having no established place of business in this state, or who has recently become a resident thereof, practicing or offering to practice herein for more than 30 days in any calendar year the profession of soil classifier, if he or she shall have filed with the board an application for registration and shall have paid the fee required by this chapter. Such exemption shall continue only for such time as the board requires for the consideration of the application for registration, provided such a person is legally qualified to practice the profession in his or her own state or country in which the requirements and qualifications for obtaining registration are not lower than those specified in this chapter.

(3) Any employee or a subordinate of a person holding registration under this chapter, or an employee of a person exempted from registration by subdivisions (1) and (2), provided this practice does not include responsible charge of work or evaluation.

(4) Any person in full employment by the state or United States government or who is fully employed to perform soil classifying services solely for his or her employer or for a subsidiary or affiliated corporation of his or her employer, provided the soil classification is in connection with the property, products, or services of his or her employer.