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

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Draft p. 3.1.20<br />

Issue<br />

234<br />

GEOLOGIC CONSIDERATIONS<br />

How important is climatic change in determining the evaluation <strong>of</strong> the hydrologic<br />

environment? (113-EPA)<br />

Response<br />

Climatic change is cited as ranking with tectonism and magmatism as important factors<br />

in determining the evolution <strong>of</strong> the hydrologic environment. An example is the difference<br />

in present day aquifer systems in arid climates and humid climates. This statement points<br />

out that climatic changes have helped determine present hydrologic regimes and should be<br />

considered as a factor for possible affecting future ones.<br />

Draft p. 3.1.20<br />

Issue<br />

It was indicated that the constraints mentioned in the last sentence are real, but pos-<br />

sibly exaggerated and a little misleading. The Western U.S. may be more active, but at<br />

least the action/inaction can be demonstrably documented there and is more difficult to<br />

document in the east. (154)<br />

Response<br />

The text has been changed (see Section B.3 <strong>of</strong> the final Statement).<br />

Draft p. 3.1.21<br />

Issue<br />

A reference should be provided for the statement that shaking caused by earthquakes is<br />

not expected to have serious effects on the repository at depth. (208-NRC)<br />

Response<br />

A reference has been added (see reference list Appendix B).<br />

Draft p. 3.1.22<br />

Issue<br />

The commenter agrees that the statements on plate tectonic concepts being useful. The<br />

really significant theory (very old) is that the earth tends to continue those tectonic

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