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<br />Cripple Creek & Victor Gold Mining Company Exhibit U <br />Cresson Project Amendment 13 <br /> 17 <br />Using the hydrologic and geochemical information developed for the District, an evaluation was <br />conducted of the fate and transport of water infiltrating to the subsurface through mines, mine <br />backfill, and OSAs. The results of the analysis were verified by checking against the observed <br />behavior of the hydraulics and chemistry of the diatreme since Cresson Project surface mining <br />began in 1993, using the measured vertical hydraulic gradients in and near the diatreme, and the <br />flow rate and chemistry of the regional groundwater exiting the Carlton Tunnel portal. The results <br />of the analysis indicate that no deleterious change in the average regional groundwater quality <br />from the District will occur due to past, current or proposed operations.