NAGRA Opalinus Clay (…002 - Version 1
FEP 18.1.6 Liquid waste injection

Technologies exist for the disposal of liquid waste deep underground in suitable geologic formations by injection. The receiving formation should have adequate porosity and permeability for storage and movement of the waste, but should be confined by strata with low permeabilities to isolate it. Opalinus Clay would not be considered suitable for such disposal because of its very low permeability. However, rocks above or below the Opalinus Clay might be considered suitable. The boreholes for the injection might influence the repository, however, the effects of liquid injection are considered to be insignificant.