Each year, CU Recycling does a Waste Composition Study for the residence halls. Single stream recycling is collected from each residence hall, and then sorted to determine what was recycled correctly and what was not. Then, levels of contamination by weight and volume is determined, as well as the weight and volume of specific types of materials (aluminum, plastic, cardboard, glass, etc). Students doing Waste Composition StudiesIn 2013, we found that 84% (by weight) of the total waste placed in residence halls recycling bins was in fact recyclable, while 16% was actually contamination. There were 229 pounds of containers recycled, 97 pounds of papers, and 35 pounds of cardboard. In coming years, we hope to get the percentage of contamination down to zero!