You can download a lengthy publication from EPA entitled "Best Management Practices for Lead at Outdoor Shooting Ranges." It's free and I'm sure will have some useful information for you.
Link:
http://www.epa.gov/region2/waste/leadshot/download.htm
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NRA Benefactor Life Member
NRA Certified Instructor: Rifle, Pistol, Shotgun, PPIH, Metallic & Shotgun Shell Reloading; RSO
Pemigewasset Valley Fish & Game Club
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