Project Description: The Department of Toxic Substances Control (DTSC) has issued a variance to Merced County Regional Waste Management Authority (CAL000366497) to receive and dispose of treated wood waste from generators, transporters, and/or handler facilities. The variance allows treated wood waste to be managed under procedures different from, but equally protective to human health and the environment to, the provisions of California Health and Safety Code (HSC) Articles 6, 6.5 and 9 of Chapter 6.5 and California Code of Regulations (CCR), Title 22, Division 4.5, Chapters 12, 13, 14, 15, 16, 18, and/or 20. Under the terms and conditions of Variance TWW-2021-DF-00070, Merced County Regional Waste Management Authority will ensure the treated wood waste will be appropriately managed. Background: Treated wood waste is a fully regulated California-only hazardous waste because it exhibits the hazardous waste characteristic of toxicity. From 2007 to December 31, 2020, treated wood waste was managed under alternative management standards, established in 22 CCR 67386. The legislation that authorized the alternative management standards for treated wood waste expired on December 31, 2020. Without the issuance of the variance, Merced County Regional Waste Management Authority would be required to seek a permit as a hazardous waste disposal facility. Merced County Regional Waste Management Authority is a governmental agency that is the regional waste management authority for Merced County. Project Activities: Under the variance, the Facility will accept treated wood waste from generators, and authorized handlers and/or transporters for disposal, however it will be managed as a California hazardous waste, under authority of HSC 25200 et seq. Operations generally include unloading and disposal of treated wood waste within Highway 59 Landfill Cells 6A and 6B, which have prepared subgrades with primary liner constructed of 60 mil HDPE. Acceptance and disposal of TWW will be consistent with hazardous waste management and disposal standards specified in the variance. The variance will expire on August 31, 2021 with possibility of extension for an additional six months.