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<br />- 3 - <br />' 3.0 Geotechnical Investioations and Recommendations <br />3.1 All geotechnical aspects of investigation, analysis and recommend- <br />ations will conform to the following guidelines: <br />1 U.S. Nuclear Regulatory Commission Guide 3.11, December, 1977 <br />(Revision 2). <br />2 "Recommended Guidelines for Preparing Engineering Geologic <br />Reports for Uranium Mill Siting, Radioactive Tailing Storage <br />and Associated Land Use Changes" by the Colorado Geologic <br />Survey, March 8, 1978. <br />3.2 The design horizontal ground acceleration shall be determined on <br />the basis of a Modified Mercalli intensity of VIII (per Colorado <br />Geological Survey Recommendation (see letter from Dames & P^oore to <br />Homestake Mining Co. - February 28, 1978)). <br />3.3 Geotechnical assessment of thickness of clays required for t\he <br />reservoir liner shall be performed. ~ S ~~ `~~ <br />4.0 Geohydrologic Provisions <br />4.1 The need and appropriate type of upstream groundwater dewatering <br />system shall be assessed and installed. <br />4.2 Downstream embankment collection and monitoring system shall be <br />evaluated and designed. <br />4.3 Overall groundwater regime shall be determined and considered for <br />the design of the dam and reservoir. <br />5_0 Geochemical Investigations shall include: <br />5.1 Geochemical suitability of materials for dam construction. <br />