The Secretary may enter, at a reasonable time, public or private property for inspecting and investigating conditions relative to the enforcement of this chapter. A person may not deny or interfere with the Secretary's entry onto public or private property to inspect or to take enforcement action pursuant to this chapter. The Secretary shall conduct: A full compliance inspection of the public pool or spa relative to the enforcement of this chapter at least once every 12 months; and An inspection of the public pool or spa relative to the enforcement of this chapter at least once every 90 business days except: If a critical violation exists, an inspection is required at least every 30 business days; or If no critical violations were found on the three previous consecutive inspections, only the full compliance inspection prescribed in §C(1) of this regulation is required.