From NSSF:

Understanding the needs of your firing range and how to effectively plan a lead reclamation and maintenance schedule is very important, but those needs and plans will differ between indoor and outdoor ranges. We’ve talked before about reclaiming lead from indoor ranges, so for this column I spoke with Jim Uhlinger, Senior Range Engineer with MT2 firing range services, to discuss some of the common questions surrounding lead reclaimed/recovered from outdoor ranges, both rifle and pistol ranges and shotgun ranges offering clay target sports.