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April 2001, GEI Consultants, Inc. <br />_ _ • Executive Summary <br />_ Page 2 of 2 <br />4, No cumulative deformation of the landslide is expected if the <br />phreatic surface is of or below the n,id-depth of the landslide and <br />mining activities over a 2-year period generate a fatal of 100 <br />magnitude 1.75 events, 20 magnitude 2.0 events, and 5 magnitude <br />2.5 events. <br />5. Cumulative deformation of the landslide is expected to be about <br />I 1 inches if the phreatic surface remains at the ground surface and <br />raining activities over a 2-year period generate a fatal of 100 <br />magnitude 1.75 events, 20 magnitude 2.0 events, and 5 magnitude <br />2.5 events. <br />6. In our opinion, movements of the amount identified in Items 3 <br />Through 5 above are not expected to cause significant threat to the <br />integrity of the slope. reservoir, or dam, <br />7. In our opinion, addaionat monitorinr_r of the dam and saddle dam. <br />beyond that required by the Office of the State Engineer for a <br />jurisdictional dam of this size and class is not required to address risks <br />associated with mine-induced seismicity. <br />_ _ • _~. aed on the results of the evaluations performed and documented in this <br />-- i~-part we recommend the following: <br />- 1 Data should be collected from the piezometers and inclinometers in <br />_. 'he existing landslide a1 least three times each year, <br />-- ~ irre collected data should be tabulated and platted on a <br />-- cantinuous time scale so that changes in water levels and <br />__ mavement, if any, of ihc- landslide can be easily identified. The data <br />-- collection should be performed and reviewed by a Colarado <br />-- registered Professional Engineer who has experience with dams, <br />-- ,andslides, and seismicity. <br />._ • <br />