As the artist, you, your Leave No Trace Lead and crew are responsible for all cleanup at your artwork site, both nightly and when the event ends. The area must be restored to the condition it was in when you first arrived — that means no MOOP, no burn scars, and minimal disturbance of the playa surface (holes and trenching). All MOOP you remove must be packed out of Black Rock City. This is what it means to LEAVE NO TRACE.
Here is information on how to plan your LNT efforts and bring the right tools to ensure that you return the Black Rock Desert to its natural beauty.