Location Assistant
1. Hired by the Location Manager to be on-set before, during, and after the filming process. General responsibilities include arriving first at the location to allow the Set Dressers into the set for preparation; maintaining the cleanliness of the location areas during filming; fielding complaints from neighbors; and ultimately, at the end of the filming, making sure it seems as though the film crew was never there. There is generally one to three assistants on a shoot at any given time.
Source: Wikipedia