When they were building behind us, the crews came in at 3:30 am and started up all their equipment and let it idle till 6, even though their permits said they weren't supposed to be doing anything til 7 am. Called the police and they gave a bs story--"Oh, it must have been someone else on the crew". Called the watch commander and asked him if he thought they had shifts, and "How would you like getting woke up between 2 and 3 every morning?". It stopped after I called the City Attorneys Office and told them why I'd be suing the city.