All I have to say is "Wow." Where do you start to get this place like this cleaned up and how long would it take before it was a disaster again? I mean, besides just a rediculous amount of spent shell casings and random targets left everywhere, people are just dumping thier trash all over the place. It's amazing what people just leave behind there and feel ok about doing it.
I think the only real option is carpet bomb the whole place.
Edit - Didn't realize I had this picture on my phone. I took this when I arrived.