That's awesome! Now that's hunting! I actually know what if feels like to do this kind of hunting.
A good friend of mine used to work at a dump site and then later became the supervisor at a transfer station a few miles outside of NYC, north of the Bronx. He actually worked for the County, not a private company. He said they were always shooting rats and pigeons but mainly big rats that came out even during the day and would always try to chew their way into the transfer station. They were using pump pneumatics and .22 rimfire. At my request he invited me up one summer day. I met up with him and one of his co-workers on a Sunday and brought one of my .22LR rimfire rifles. This was in the early '90's and I only had a Crossman 760 but decided to bring a semi-automatic Marlin .22LR instead with a 3-9x32 scope because they told me the distances might be 30+yds and they were right. It was a lot of fun shooting the rats from 25-50yds away. These guys even baited them with some garbage food and a hundred+ rats came out in broad daylight. There was nothing around but the building and a lot of woods. Those guys were using a Ben Sheridan in .20 cal I think. I let them take the ones closer and I took the long shots. We did most of the shooting from inside our cars. When we walked out of the car the rats retreated. I shot a few of them while they were walking or moving. They don't stay put for long. We were up on a hill and The NY State Thruway (main highway that goes through the entire state) was about 150-200yds away down below us. Nothign around for about a 1/2mi. radius. We got there late afternoon and quit about 2hrs later after it got dark although we had plenty of lighting around the building, the rats had wised up and disappeared. My friend went out and picked up the 14 rats and put them in a black garbage bag. He then walked to the edge of the tree line and started throwing them one by one into the woods to feed the owls and a bobcat they had spotted a few days before. I have always wondered if we killed that bobcat or an owl with lead poisoning..