36 CFR §9.113

1. (a)You must maintain your area of operations in a manner that avoids or minimizes the cause or spread of fires and does not intensify fires originating outside your operations area.
2. (b)You must maintain site security, structures, facilities, improvements, and equipment in a safe and professional manner in order to provide a safe environment for park resources, park visitors, and NPS employees, free from exposure to physical and chemical hazards.