Was there recently and there was others peoples garbage we couldn't haul out since our vehicle was maxed out just bringing our regular shooting stuff. Next time I'll be bringing a truck so that won't be an issue.
A cheap tarp would go a long way to catching all your brass easily.
I think a few big warning signs would be helpful......
Clean up or it get's shut down!
Would the BLM guys flip if some signs were made up?
"Yeah, like... well, I just want to slap a hippie or two. Maybe even make them get jobs."