One of the recent trends in recycling right now is all-in-one recycling. All the paper, plastic, glass, and metal waste goes into one recycle bin, which is sorted at the factory. The argument is that it requires fewer trucks to pick it all up.
Construction work is usually seasonal. Many crops can only be grown during specific times during the year. Retail clerk positions are often seasonal. Package delivery personnel are often hired during the holidays.
Seasonal identifies a work schedule and is not an appointment type. Seasonal employment is appropriate when the work recurs predictably year-to-year and is expected to last at least 6 months during a calendar year.