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SUNDAY MINE COMPLEX- HYDROGEOLOGIC REPORT <br /> table shows estimated average linear velocity values and travel times for groundwater within the <br /> Salt Wash/Top Rim in the SMC study area. <br /> K vX Travel Time <br /> (ft/d) ne 2h/21 (ft/d) (years) <br /> 0.31 0.16 0.01 1.9 x 10 2,740 <br /> 0.001534 0.16 0.01 9.6 x 10 542,237 <br /> 0.005066 0.16 0.01 3.2 x 10 162,671 <br /> 0.005066 0.16 0.001 3.2 x 10 1,626,712 <br /> As shown in the above table, it is estimated that the travel time for a conservative dissolved <br /> contaminate is measured to be a minimum of two thousand years to reach the Dolores River. A <br /> less conservative estimate for the hydraulic gradient (0.001) and hydraulic conductivity <br /> (0.005066) yields a travel time over one million years. Travel time to the central portion of <br /> Disappointment Valley would be about one-half this time. However, it is not likely that <br /> groundwater in the Salt Wash Member would be developed in this area because of the <br /> excessive depth, low yield, and poor ambient water quality of groundwater within the Salt Wash. <br /> Vertical upward migration of Salt Wash groundwater may be possible by way of continuous <br /> fracture systems, if present. The average linear velocity and travel time estimates do not take <br /> into account hydrodynamic dispersion, the process of attenuation of introduced contaminants. <br /> Hydrodynamic dispersion has the effect of dampening or reducing contaminant concentrations <br /> over space and time along a given flow path. <br /> 11.5 Water Quality <br /> The water quality monitoring program has provided sufficient groundwater chemistry data to <br /> allow for a thorough assessment of baseline conditions and characterization of the groundwater <br /> chemistry of the mining zone. These data have been assimilated and interpreted with regard to <br /> overall relative constituent concentrations in space and time. Water chemistry data are <br /> presented in Appendix B, Tables 10-3 and 10-4. Selected constituents were plotted with <br /> concentrations versus time, and also as bar graphs showing minimum and maximum values <br /> (see Appendix C). <br /> To evaluate general water type, Piper Plots were constructed for each well or sampling location <br /> (see Appendix C, Plots 11-1 through 11-4). These plots indicate that MW-SUN1 groundwater is <br /> Western Water& Land, Inc. 45 <br />