(a) That he has intentionally made a material misstatement in the application for such license; or
(b) That he has willfully violated any provisions of this chapter; or
(c) That he has obtained, or attempted to obtain, such license by fraud or misrepresentation; or
(d) That he has been guilty of fraudulent or dishonest practices; or
(e) That he has demonstrated lack of competence as a driller of water wells; or
(f) That he has failed or refused to file reports as required under the provisions of this chapter; or
(g) That he has willfully and contumaciously refused to obey reasonable orders, rules, and regulations of the board.