ITEMS THAT MAY NOT BE PLACED IN DUMPSTER
Items that CAN NOT be placed in the dumpster: Tree limbs over one-half inch in diameter, logs & tree trunks, dead animals, metal, wastes left from industrial or manufacturing processes or operations, loose earth (dirt), sand, gravel, stone, rock or concrete in quantities over four cubic feet, furniture, lumber or other bulky objects, all wastes resulting from construction or building operations and all other wastes materials not herein defined as “garbage” or “trash”.
You are also required to place your garbage & trash in the containers and not beside the container.
Original source can be found here.