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<br />~ <br /> <br />Woodward.CIyde Consultants <br /> <br />C ..':"'..../,.. <br />(.1.).0 <br /> <br />, <br /> <br />and right abutment axis. Figure 2 is a geologic cross-section <br /> <br />along the dam axis. <br />In considering the question of geologic conditions related <br /> <br />, <br /> <br />to safety, the following matters were considered: <br /> <br />(I) The nature of foundation forma~s as related to <br />supporting the dam and appur;rrn~t structures. <br /> <br />(2) Adverse geologic formation1/,true.tures such as <br />faults, shear zones, etc.<v! ~~ <br /> <br />(3) Minerals within the foundation for~ions that would <br />adversely affect the s'f~ty of the dam~ <br /> <br />(4) Potential for lands;r~~ around the reservoir and at <br />or nea r the dam. <... Z/) <br /> <br />(5) Erosion resistance ot cr~cal areas at or near the <br />dam site. ~~ <br /> <br />(6) Seismologic cond.i ions t~l!),i9ht be adverse to the <br />safety of thJ~~ <br /> <br />2. Foundation Formation \ ~, <br /> <br />The left side and cent a] portion of the dam will be <br /> <br />Eounded upon th~hale consists of firm, <br />_ _ - _~ighl.y_ conso~~ ;a~bon~c:eous-Shale~- - T.he-righ,t ,s ide-of- the-~ <br />dam will be on ~~~ and Quaternary alluvial and aeolian <br />soils. :'\ V <br />J,ne Pierre sh Ie is dark gray, thinly laminated to thickly <br />bedded. It was d~/osited in shallow marine conditions and, <br />althou~prima.v<y composed of clayey and silty shale, it <br />contains so~~ers of fine, silty sandstone and can include <br /> <br /> <br />~ <br /> <br />, <br /> <br />. <br /> <br />~ <br /> <br />. <br /> <br />~ <br /> <br />some layers of plastic clay. The laminations are nearly flat <br /> <br />~ <br /> <br />lying with a northward dip of only 3 to 5 degrees. The surface <br /> <br />- 7 - <br /> <br />~ <br /> <br />~ <br />.. <br />