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Senate Environment and Public Works Subcommittee on Chemical Safety, Waste Management, Environmental Justice, and Regulatory Oversight Chairman Jeff Merkley says opening a hearing with a Washington State program manager, a US Tire Manufacturers Association representative and a chemical exposure attorney about the environmental impacts of 6PPD that Oregon alone produces 4 million waste tires annually, with two-thirds being shredded or illegally dumped, contributing to ongoing 6PPD contamination even when tires were recycled or repurposed, and highlights that various agencies, including Washington's Department of Ecology, were researching strategies to address these challenges through methods like stormwater mitigation, source control, and water infrastructure improvements.