The Environmental Protection Agency (EPA or the Agency) is issuing amendments to the Non-Hazardous Secondary Materials rule, initially promulgated on March 21, 2011, and amended on February 7, 2013, under the Resource Conservation and Recovery Act. The Non- Hazardous Secondary Materials rule generally established standards and procedures for identifying whether non-hazardous secondary materials are solid wastes when used as fuels or ingredients in combustion units. In the February 2013 amendments, the EPA listed particular non- hazardous secondary materials as "categorical non-waste fuels" provided certain conditions are met. Persons burning these non- hazardous secondary materials do not need to evaluate them under the general case-by-case standards and procedures that would otherwise apply to non-hazardous secondary materials used in combustion units. This action adds three materials to the list of categorical non-waste fuels: Construction and demolition wood processed from construction and demolition debris according to best management practices; paper recycling residuals generated from the recycling of recovered paper, paperboard and corrugated containers and combusted by paper recycling mills whose boilers are designed to burn solid fuel; and creosote treated railroad ties that are processed and then combusted in the following types of units: Units designed to burn both biomass and fuel oil as part of normal operations and not solely as part of start-up or shut-down operations, and units at major source pulp and paper mills or power producers subject to 40 CFR part 63, subpart DDDDD that combust CTRT and had been designed to burn biomass and fuel oil, but are modified (e.g. oil delivery mechanisms are removed) in order to use natural gas instead of fuel oil, as part of normal operations and not solely as part of start-up or shut-down operations.