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Draft p. 3.1.12 and DOE/ET-0028, p. 7.2.9<br />

Issue<br />

229<br />

GEOLOGIC CONSIDERATIONS<br />

It would be better to use either a more recent reference than Pirsson's 1947 book or<br />

to be more selective in the data excerpted from Pirsson. For example, the silica content<br />

<strong>of</strong> the granite is rather high. It turns out that this represents a single sample from Pikes<br />

Peak (Pirsson, pg. 169). It would have been better to use Tschirwinsky's average <strong>of</strong> 90<br />

analyses (Pirsson, pg. 169) which results in a significantly different chemical composition<br />

for an "average" granite. An alternate source <strong>of</strong> information is Clark, S.P., 1966, "Hand-<br />

book <strong>of</strong> Physical Constants," Geol. Soc. <strong>of</strong> Amer. (208-NRC)<br />

Response<br />

The granite composition given in Table 3.1.2 has been changed to that given in USGS<br />

Open-File Report 74-158 and the reference has been changed. See Appendix B <strong>of</strong> final<br />

Statement and references 8,.11 and 23 in the Appendix B reference lists.<br />

Draft p. 3.1.13<br />

Issue<br />

Response<br />

Figure 3.1.3 does not appear in reference 10 (draft Section 3.1.1). (208-NRC)<br />

Reference is incorrect and has been changed to reference 6 (see final Appendix B).<br />

Draft p. 3.1.13<br />

Issue<br />

One commenter suggested it should be mentioned that a major problem <strong>of</strong> basalts is sedi-<br />

mentary interbeds. (154)<br />

Response<br />

This is discussed under Rock Permeability and Groundwater Flow (draft p. 3.1.32).<br />

Draft p. 3.1.13, DOE/ET-0028, p. 7.2.12<br />

Issue<br />

Several commenters strongly disagree with the assertion that there is limited<br />

porosity, permeability in basalt rocks. (43, 208-NRC, 214, 218-001)

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