Unwanted Trash disposal

[Benji Marshall]

I have a 8 yd trash container for my tenants residing in 18 unit duplex in a rural community. My problem is that I have unwanted people using the container that doesn't live at the complex that I can never seem to catch. I have a pile of tires by my dump as we speak. I've posted illegal dumping signs but that doesn't seem to work. Does anyone have any ideas to get rid of the unwanted guests? Any suggestions or recommendations will be greatly appreciated!