Dig a trench so when they pull into there dumping spot there stuck.My buddy did that "cityits" were dumping on his land so he dug a trench the width of the langway and about 3 half feet wide about 3 feet deep cover it with a tarp took the rake covered it back up with grass,leaves etc.Caught him self a real nervous cityslicker 1 night. Guy was charged and had to pay for a tow . Just remeber ware it is and tell others that use the lang cop told him it was not a smart thing to do but he understood.