The U.S. Environmental Protection Agency has a very strong interest in the design, construction, performance and closure of waste management facilities. In general, the Agency would like these facilities to be environmentally friendly - i.e., not to be a source of any type of potential pollution to the environment or a significant threat to public health. Since these facilities are man-made structures built with man-made and natural materials, it is incumbent to build the best facility that one can. The Agency, under the RCRA regulations as amended by HSWA and the Municipal Solid Waste Landfill regulations, strongly encourage the use of quality control/quality assurance (QA/QC) programs to help ensure that the construction of waste management facilities is the highest that can be achieved.