Mary, they are during the week. The biggest issue is saturday through monday morning when the barrels dont get emptied out, the trash piles up, and end it eventually ends up flying out into the city streets.
DPW mentioned that they'll be installing solar trash compactors like the ones seen in boston in the upcoming weeks.

DPW: There is also trash pilling up in the Dunkin Donuts parking lot located on Williams St/Cherry St. Local businesses that use the lot for their guests do not clean this site up.

The city barrels are emptied six days a week. We are in the process of purchasing solar compacting barrels. These barrels will be able to compact the trash when full, and thus will hold more. They are also equipped with a program which will inform the office when they are full.