2021 U.S. Scrap TIre Workgroup (USSTWG)

Questions about tire materials raise questions about scrap tire markets - zinc • “The petition cites two studies from Texas showing substantially higher zinc levels in stormwater runoff from asphalt formulated with tire rubber than without. Recycled tires are also used in other applications, notably playgrounds and athletic fields. However, the relative contributions of these sources to zinc concentrations in stormwater are likely to be minor.” – See: https://dtsc.ca.gov/wp- content/uploads/sites/31/2021/08/Ext.- Speaker-1-Watson-and-Krieger_ADA- Compliant-7.26.2021.pdf and https://dtsc.ca.gov/wp- content/uploads/sites/31/2021/03/Rationale- Document-Zinc-in-Tires.pdf 9