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260<br />

GEOLOGIC CONSIDERATIONS<br />

be mapped. Sandstone, limestone, shale, granite and basalt are not formations, whereas<br />

rock bodies such as the Dakota Sandstone, Salem Limestone, and Pierre Shale, and Louann<br />

Salt are. (208-NRC)<br />

Response<br />

The improper use <strong>of</strong> the term "formation" will be corrected upon publication <strong>of</strong> an<br />

addendum or an errata to the DOE/ET-0029 and DOE/ET-0029 documents.<br />

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

Issue<br />

The statement that igneous rock "...range is chemical and mineralogical composition<br />

from granite to closely related rocks such as granodiorite" is technically true but mis-<br />

leading. The range goes far beyond granodiorite through gabbro to pyroxenite and dunite.<br />

(208-NRC)<br />

Response<br />

The statement identified by the commenter identifies the range <strong>of</strong> granitic rocks<br />

receiving detailed analysis as potential host rocks. The statement is thought to be<br />

appropriate and is not expected to be changed.<br />

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

Issue<br />

The statement that "granite is mostly composed <strong>of</strong> silica and mica" is misleading.<br />

Mica makes up a small percent <strong>of</strong> most granites and quartz rarely exceeds 30%. Mention<br />

should be made <strong>of</strong> other minerals common in granite such as the feldspar and ferromangesian<br />

minerals. (208-NRC)<br />

Response<br />

The DOE agrees that the statement as it stands is misleading. Quartz and mica minerals<br />

are among the major minerals making up granite but they do not necessarily constitute the<br />

majority granite composition. The appropriate corrections will be made upon publication <strong>of</strong><br />

a errata or addendum to the DOE/ET-0028 and DOE/ET-0029 documents.<br />

DOE/ET-0028, p. 7.2.10<br />

Issue<br />

The basic references <strong>of</strong> Pirsson 1947 and Gilluy, Woodford and Aateus, 1968 should be<br />

replaced by reference to one <strong>of</strong> the following: Robert L. Folks Petrology <strong>of</strong> Sedimentary

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