Engineering geology considerations in planning

This section provides guidance in determining what engineering geology considerations may need to be investigated for various waste management components (table 7-2). The significance of each consideration is briefly described with some guidance given on how to recognize it in the field. Most issues serve as signals or red flags that, if encountered, justify requesting assistance of a geologist or other technical specialist.

Table 7-1 Porosity and specific yield for various geologic materials (from Driscoll 1986 and Johnson 1967)

Geologic material Porosity Specific yield


Gravel (mix) Sand (mix) Silt Clay

Sand, silt, clay mixes Sand and gravel mixes


Fractured or porous basalt Fractured crystalline rock Solid (unfractured) rock Karst topography Sandstone Limestone, dolomite Shale

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