... in the area are Cambro-Silurian shale and nodular limestone. The conditions revealed by excavation were very similar to those predicted from the combined results of surface mapping, drill core analyses and seismic measurements The support is systematic bolting and shotcrete, partly mesh reinforced. Some...

... by porosity to about 15% and due to the presence of erosion channel and cavities. Large quantities of groundwater in the porespaces make the sandstone a good confined and unconfined aquifer due to interlayering with shale. The granite is medium to coarse grained with large size felspar. Physical and chemical...

... be relatively free of major seismic activity and active faults. The confinement strata should have: 1. thick, impermeable strata both above and below injection formation, with adequate vertical and lateral separation from potable waters. Unfractured shale, clay, salt, siltstone, anhydrite, gypsum, marl...