Project Description: The Department of Toxic Substances Control (DTSC) has issued a variance to Browning Ferris Industries of Ca, Inc. Corinda Los Trancos Landfill (Ox Mountain) (CAD063015911) to receive and dispose of treated wood waste from generators, transporters, and/or handler facilities. Operations related to treated wood waste will be consistent with previous treated wood waste activities conducted by the applicant. 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-00052, Browning Ferris Industries of Ca, Inc. Corinda Los Trancos Landfill (Ox Mountain) 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, Browning Ferris Industries of Ca, Inc. Corinda Los Trancos Landfill (Ox Mountain) would be required to seek a permit as a hazardous waste disposal facility. Browning Ferris Industries of Ca, Inc. Corinda Los Trancos Landfill (Ox Mountain) is a solid waste management company. The applicant previously conducted treated wood waste management activities under the now expired alternative management standards established at 22 CCR 67386. 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 Browning Ferris Industries of Ca., Inc. Corinda Los Trancos Landfill (Ox Mountain) Phases XX and XXI. Phase XX and XXI is comprised of Subtitle D and Overliner areas. The Subtitle D Floor and bench areas, composite liner system consists of 80 mil HDPE geomembrane over 2 feet of low permeability clay liner. Subtitle D sides slopes are comprised of 80 mil HDPE overlaying GCL overlaying 60 mil HDPE moisture barrier. Overliner systems are comprised of 80 mil LLDPE geomembrane overlaying GCL overlaying 60 mil LLDPE overlaying 6-inchverneer subgrade. Acceptance and disposal of TWW will be consistent with hazardous waste management and disposal standards specified in the variance. The variance will expire on September 1, 2021 with possibility of extension for an additional six months.