Every few days a landscaper comes into my wash and blasts the mulch and trash (nails, screws, metal shavings and water bottles) out of the back of his truck. Also in the past few weeks I've had someone dump an old couch in the bay, others have dumped garbage bags with beer bottles ECT. This closes down those bays until I come back sometimes a few hours later and clean it up. What can I do) legally to bust these guys. Is there a law against this kind of dumping? Any help will be appreciated thanks!