OK, ventilation is substandard for the industry, get them to work on that right away! A bank of fans need to be installed right across the shooting stations, pointed downrange, going on high. This is to provide cool air, andto blow powder/lead residue down range towards the exhaust vents. Use swamp coolers during dry times, (do you have those?) and run AC if you can. Down range, you're SOL, nobody should run duct work that far down - it will only get shot up. But to be legit for NRA indoor range rules, that vent system is bad.
Fans blowing downrange are a must.
As for people moving in, we had an expert come in and soundproof the puppy. As long as the sound leakage meets local ordinaces, then phhhhbbbt! on them. I do NOT reccomend painting a giant red sign on the back of the range saying "Dangerous End"....