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Management of Commercially Generated Radioactive Waste - U.S. ...

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Response<br />

230<br />

GEOLOGIC CONSIDERATIONS<br />

The text has been changed (see Section B.6.4 <strong>of</strong> the final Statement).<br />

Draft p. 3.1.13<br />

Issue<br />

The fact that basalts are layered with discontinuities, volcanic ash, "soil," sand-<br />

stones, etc., between the layers was left out <strong>of</strong> the discussion <strong>of</strong> basalts and jointing.<br />

The zone between layers ranges in permeability from opened to sealed. (218-DOI)<br />

Response<br />

The text has been changed (see Section B.6.4 <strong>of</strong> the final Statement).<br />

Draft p 3.1.14<br />

Issue<br />

Response<br />

The selection <strong>of</strong> numerical ratings should be discussed. (208-NRC)<br />

The ratings are for comparative purposes and represent an attempt to assign a relative<br />

scale to the media properties for comparison among the media types. The intent is more to<br />

summarize rather than rank the isolation potential <strong>of</strong> the rock types. Later revision<br />

deleted this portion <strong>of</strong> the text.<br />

Draft p. 3.1.14<br />

Issue<br />

There should be two categories <strong>of</strong> salt, bedded salt and salt domes, so that the differ-<br />

ence in moisture content can be emphasized. Salt domes have lower moisture content which<br />

is a major consideration.<br />

Plasticity, ion exchange capacity, and linear discontinuities should be added to the<br />

properties for the rock types. Plasticity values would have the following relative scale<br />

values: bedded salt (3), salt domes (3), granite (1), shale (2), and basalt (1). Ion<br />

exchange capacity would have values <strong>of</strong> 1, 1, 2, 3, and 2, respectively. Linear discontinu-<br />

ities would have values <strong>of</strong> 3, 3, 2, 3, and 1, respectively. (113-EPA)

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