The Environmental Protection Agency (EPA) is granting a petition submitted by ExxonMobil Refining and Supply Company (ExxonMobil) Baytown Refinery to exclude from hazardous waste control (or delist) a certain solid waste. This final rule responds to the petition submitted by ExxonMobil to have the F039 underflow water generated at the North Landfarm (NLF) in Baytown, Texas excluded, or delisted, from the definition of a hazardous waste. After careful analysis and evaluation of comments submitted by the public, the EPA has concluded that the petitioned wastes are not hazardous waste when disposed of in Subtitle D landfills. This exclusion applies to 7,427 cubic yards per year of the F039 underflow water. Accordingly, this final rule excludes the petitioned waste from the requirements of hazardous waste regulations under the Resource Conservation and Recovery Act (RCRA) when disposed of in Subtitle D landfills but imposes testing conditions to ensure that the future- generated wastes remain qualified for delisting.