Egdar, a good theoretical point but practically speaking, elemental arsenic is relatively stable and unaffected by air and water. Also it’s a minimal percentage of the antimony that's bound up in the lead pellets. Hence it would seem that reaction of arsenic the surface of the pellets with acid rain etc would take a very long time and runoff would be largely diluted.
Nowadays it seems we as a nation are perhaps overly sensitized to environmental "contaminants" with the latest one today having to do with July 4th aerial firework displays. Granted, the variety of colors result from salts of bad actors like barium, copper, strontium and others added to the pyrotechnic mix, but all told the dilution factor is never considered by those with little scientific background but are adept with google and then call loudly for outright bans on this or that.
All this with a grain of salt from a guy who's kind of desensitized on relatively minor environmental pollutants, having grown up in a town with the smoke of burning coal culm dumps heavily laden with H2S and SO2 when the wind was from the south, and while managing in a pulp mill and breathing NH3 and SO2 from inevitable process leaks.
All this just my take on things.
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