Concord Public Works provides drop-off location for corrugated cardboard. These containers are for residential use only and are not available for commercial or retail use. Curbside subscribers can leave cardboard in or beside their recycle bin on collection day. Cardboard must be flattened to 30-inches by 30-inches at a maximum please. Remove and dispose of all other materials, such as styrofoam block, wood, plastic, and more.