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Geotechnical Evaluation of Mine-Induced Earthquakes on Bruce Park Dam <br />Bowie Resources, Limited <br />June 2002 <br />generate a total of 100 magnitude 1.75 events, 20 magnitude 2.0 events, and 5 <br />magnitude 2.5 events. <br />5. Cumulative deformation of the landslide is expected to be about 11 inches if the <br />phreatic surface remains at the ground surface and mining activities over a 2-year <br />period generate a total of 100'magnitude 1.75 events, 20 magnitude 2.0 events, and 5 <br />magnitude 2.5 events. <br />6. In our opinion, movements of the amount identified in Items 3 through 5 above are <br />not expected to cause significant threat to the integrity of the slope, reservoir, or dam. <br />7. In our opinion, additional monitoring of the dam and saddle dam, beyond that <br />required by the Office of the State Engineer for a jurisdictional dam of this size and <br />class is not required to address risks associated with mine-induced seismicity. <br />Based on the results of the evaluations performed and documented in this report, we <br />recommend the following: <br />1. Data should be collected from the piezometers and inclinometers in the existing <br />landslide at least three times each year. <br />2. The collected data should be tabulated and plotted on a continuous time scale so that <br />changes in water levels and movement, if any, of the landslide can be easily <br />identified. The data collection should be performed and reviewed by a Colorado <br />registered Professional Engineer who has experience with dams, landslides, and <br />seismicity. <br />02•05•2: GeotecAnical Evaluation of Mine-Induced EartAquaka <br />GEI Consultants, Inc.