"disposed below" is a valid phrase and is used in written English.
It is typically used to describe something that has been placed below something else, usually in a specific arrangement. For example, "The toys were disposed below the sofa so that they were out of reach of the toddlers."
Many countries agree the hazardous material - some of it at temperatures of 90C - has to be disposed of deep below ground where it can be isolated from all living things for tens of thousands of years whilst the radiation slowly reduces.
During the Thatcher era over 50% of it was disposed of at well below market rates.
At the Hanford (Washington, USA) site, caustic liquid waste with high 90Sr concentrations was disposed in tanks buried below the subsurface.
It has served its life and needs to be disposed of properly (see Warnings below).
However, because C&D waste is inert and nonhazardous, it is usually disposed of in municipal sanitary landfills (see below).
Drinkable water is produced by separating TDS from water through desalination which typically produces 50 90% potable water and the remaining water (brine) is disposed in evaporation ponds or by injecting it below the ground surface, which is not sustainable.
In Oklahoma, the wastewater is disposed of outside the oil fields and injected below the groundwater aquifer, where it can trickle down and trigger movement on a long-dormant fault, Hauksson said.
XFI indicated that Cd was localized in highly specific regions within the trichome, bilaterally disposed, straddling the stem of the Y-shaped trichomes, just below the branch.
However, to ensure consistency in the infection control process, the Working Party recommends that circuits are disposed of when the anaesthetic machine and monitors are cleaned (see below).
Sini is similarly disposed.
