The document provides background information on EPA's technical support for selecting and developing treatment standards for the constituents to be regulated for the K009 and K010 wastes. Section 2 presents waste-specific information, the number and location of facilities affected by the land disposal restrictions, the waste generating process, and waste characterization data. Section 3 discusses the applicable and demonstrated technologies used to treat the waste or similar wastes, and Section 4 summarizes the available performance data, including data on which the treatment standards are based. Section 5 explains EPA's determination of BDAT, while Section 6 discusses the selection of constituents proposed for regulation. Determination of treatment standards is presented in Section 7.