Photo courtesy Larry Gibbons, Rocky Mountain Recycling, June 25, 2018 Workers at Rocky Mountain Recycling sort municipal waste Monday at its Salt Lake City plant. This material arrives through the curbside pickup program conducted across all of Salt Lake County, which nets about 100,000 tons a year. Plastic material is bound for China, but much of it is contaminated, driving down its value for Chinese manufacturers and threatening the viability of curbside programs across the United States.