As we previewed a few months ago, the U.S. Environmental Protection Agency (USEPA) recently proposed a rule to exclude CO2 streams from Resource Conservation and Recovery Act (RCRA) regulations if they meet certain conditions, including injection for the purpose of geologic sequestration into specific wells regulated under the Safe Drinking Water Act. The proposed rule, which was published on August 8, comes on top of an earlier Safe Drinking Water Act regulation finalized in December 2010 that sets requirements for geologic sequestration, including the development of a new class of injection well called Class VI, established under USEPA’s Underground Injection Control (UIC) program. The UIC Class VI requirements are designed to ensure that wells used for geologic sequestration of CO2 streams are appropriately sited, constructed, tested, monitored, and closed in a manner that ensures USDW protection.

In developing the proposed rule, USEPA determined that CO2 streams captured at power plants and industrial facilities destined for a UIC Class VI well for the purposes of geologic sequestration would be a RCRA solid waste, as it is a “discarded material” as defined in RCRA § 1004(27). In its discussion of the rule, USEPA indicated that, while there is little information available to conclude that CO2 streams would qualify as a RCRA subtitle C hazardous waste, there is the potential for some CO2 streams to meet the definition of a hazardous waste. USEPA concluded that the management of CO2 streams under the proposed conditions does not present a substantial risk to human health or the environment, and will encourage the geologic sequestration of CO2, in a safe and environmentally protective manner.

The proposed exclusion, if finalized, may apply to generators, transporters, and owners or operators of treatment, storage, and disposal facilities engaged in the management of CO2 streams that would otherwise be regulated as hazardous wastes under the RCRA subtitle C hazardous waste regulations as part of geologic sequestration activities. This includes entities in the following industries: operators of CO2 injection wells used for geologic sequestration; and certain industries identified by their North American Industry Classification System (NAICS) code: oil and gas extraction facilities (NAICS 211111); utilities (NAICS 22); transportation (NAICS 48-49); and manufacturing (NAICS 31-33).