“At a superintendent’s discretion, parks might tighten grounds/areas with supportive natural, cultural, historic, or archaeological resources exposed to destruction, looting, or other repairs that can't be sufficient stable by a excepted law coercion staff that sojourn on duty,” Barnum said.
Article source: http://www.philly.com/news/nation-world/garbage-feces-take-toll-national-parks-amid-shutdown-20190101.html