1.8. Four IAEA publications address monitoring and surveillance of disposal facilities: Safety Reports Series No. 27 on Monitoring and Surveillance of Residues from the Mining and Milling of Uranium and Thorium [8]; Safety Reports Series No. 35 on Surveillance and Monitoring of Near Surface Disposal Facilities for Radioactive Waste [9]; Safety Reports Series No. 64 on Programmes and Systems for Source and Environmental Radiation Monitoring [10]; and IAEA-TECDOC-1208 on Monitoring of Geological Repositories for High Level Radioactive Waste [11]. The scope of the present Safety Guide is broader than that of these informational publications, which have served as a resource for development of this Safety Guide.