I think it is fair to say when working in the City you must be prepared to absorb losses from theft and illegal activity such as dumping. Those that are engaged in this type of behaviour are fearless and brazen in their daylight activities. They rely successfully on the anonymity and speed at which they do their work. The chances of being caught dumping garbage at a job site are low, so these crooks are doing it constantly.
I may be investing in some security cameras for a future project to see if I can catch some of this in the act. My plan will be to reload the unwanted couch or pile of debris that someone decides should be emptied on my site, and dump it on the guilty parties front door. I'm sure they will appreciate getting their garbage back.
Here is the remnants of someone clearing brush and cutting out old fencing. They were able to take down my fence, dump their material, and actually put the fence back up. I guess I should thank these idiots for actually putting the fence back. That is generally too much to ask for.