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Sm Luis Mine -Phase U, Race I Deaign Report
<br />' It should also be cleazly understood that the probability of the MCE event ogcurring is very low.
<br />Based on Dr. Glass' estimates of probability presented in the Permit, there is a 0.1 to 2.5 percent
<br />' probability that 0.6g PGA could be experienced at the site in the nett 20 years.
<br />Construction of the dam raise should include establishing survey control points along the crest of
<br />the raise and existing embankment as well as various locations on the downstream face. Following
<br />any lazge earthquakes in the area, these survey points should be utilized to determine if any
<br />' deformation of the structure has occurred. This will provide a basis for determining the extent, if
<br />any, of damage to the structure, and although unlikely, the need for remedial action. The dam
<br />should also be inspected by a qualified geotechnical engineer for any signs of cracking, increased
<br />seepage, and slope instability or bulging.
<br />' 6.0
<br />Franklin, A.G. and Change F.K., 1977; "Permanent Displacements of Earth Embankments by
<br />Newmark Sliding Block Analysis". Earthquake Resistance of Earth and Rock-Fill Dams,
<br />Report 5, U.S. Army Engineering Waterways Experiment Station, Vicksburg, Mississippi.
<br />Makdisi, F.I. and Seed, H.B., 1977; "A Simplified Procedure for Estimating 8arthquake Induced
<br />' Deformations in Dams and Embankments." Report No. UCB/EERC - 77/19, Earthquake
<br />Engineering Research Center, University of California, Berkeley, California.
<br />' Newmark, N. M., 1965; "Effects of Earthquakes on Dams and Embankments", Geotechnique Vol.
<br />5 No. 2, pp 139-160.
<br />' Seed, R. and Harder, L., 1990; "SPT-Based Analysis of Cyclic Pore Pressure Generation and
<br />Undrained Residual Strength", Proceedings H. Bolton Seed Memorial Symposium, M.
<br />' Duncan ed., V.2, Bi-Tech Publishers, Vancouver, British Columbia.
<br />' Seed, H. B, and Idriss, I.M., 1982; "Ground Motions and Soil Liquefaction During Earthquakes".
<br />Earthquake Engineering Research Institute Monograph Series, Berkeley, Glifornia, 134 pgs.
<br />U.S. Bureau of Reclamation, 1989; "Seismic Design and Analysis, Design Standadds -Embankment
<br />Design, Chapter 13", December.
<br />' July I3, 1493 13 SRK Project No. 14719
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