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United States Department of the Interior 3
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GEOLOGICAL SURVEY Q ".,
Denver Federal Center Denver, Colorado 80225 v.-
a October 30, 1973
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T 7:7-I Mr. William P. Gammill, Chief Site Analysis Branch Directorate of Licensing Office of Regulation U.S. Atomic Energy Commission
, Washington, D.C. 20545
Dear Mr. Gammill:
. A revisiion of page 2 of the Geological Survey's preliminary draft 19 review [f the Preliminary Safett Analysis Report submitted by the
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. A copy d5 the review was transmitted ' to you by E. H. Baltz, Jr.,
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Deputy Chief, Engineering Geology, on October'5, 1973. The changes -
have ' o do with the incorrect identification of boundaries' being t
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discussd,d for the' Triassic basin underlying the Coastal Plain de '
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- t posits of the site.-
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I Sincerely yours,-
7-F. N. Houser, Chief Reactor Site Investigations
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Attachment 8505280220 841015 PDR FOIA SHOLLY84-624 PDR
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As plotted on figure 2.5-4A, the location is in line with the north-west bo'undary of the inferred Triassic basin, which, in view of the pre-cision of the available magnetic data, could well project to the south-west beneath the location given for the site. The trend of this boundary appears to-be parallel and to lie generally below the axis or. slope of the northwestward dipping monoclinal flexure illustrated in figure 2.5-10.
Marine and Siple (1971) state that in a test hole located about 9 miles north-east of the VNP site, about 1,590 feet of Triassic fanglomerate was pene-trated before entering crystalline basement. A group
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located about 2 miles north of the above hole all penetrated crystalline rock below the Coastal Plain sed,iments. The northwest boundary of the Triassic basin appears, therefore, to be abrupt with over 1,500 feet of relief--much of which could be structural--expressed on top of the crystalline basement.
When the location provided in figure 2.5-3 is used, the site is approximately over the inferred southeastern Triassic basin boundary.
The, applicant should provide a site vicinity map that accurately 14 '.'
3 he site location and the underlying structural features and portrays revise th'e discussion of the relationship of the site to the underlying t
Triaasic basin structure as required'.
Reference cited
' Marine, I. W., and Siple, G. E.,1971, Buried Triassic basin in the central Savannah River area, South Carolina and Georgiajabs,,}:
Geol. Soc.' America, Southeastern section, Abstracts with Programs;-
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- v. 3, no. 5, p. 289-363.
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