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the contention that the shallow ground water system at the mine and <br />• the adjacent area is a poor source of water. The transmissivity <br />values recently determined range from 2 to 58 ft2 day-1 In light <br />of the recent aquifer test results, further tests are planned for <br />the 1987 field season. These tests will be performed on wells <br />located in the Nucla East Mine area. <br />E. Ground Water Quality <br />PCC monitored the ground water quality in wells GW-N1, N3, N4, <br />N5, N6, and N9 on a semi-annual schedule between October 1979 <br />and December 1982. In 1963, at the request of the CMLRD, the <br />monitoring program was revised (see Appendix A}. The reduced <br />monitoring program stipulated that only monitor wells GW-N3, N4, <br />N9, and N10 were required to be sampled semiannually for water <br />quality analyses. Because monitor well GW-N10 has been dry since <br />it was constructed, no samples have yet been able to be collected <br />from it. <br />• The ground water quality data are presented in Appendix G. The <br />ground water samples are analyzed according to the ground water <br />parameter list presented in Table 22. <br />Statistical summaries of the water quality for each of the <br />sampled monitor wells are presented on Tables 27 through 32. A <br />trilinear diagram representing the mean of the water quality <br />analyses for each of the sampled monitor wells is presented on <br />Figure 17. The mean EC and SAR values for each of the sampled <br />monitor wells are plotted on Figure 18. Figures 19 through 24 <br />present plots of depth to water (DTk) and total dissolved solids <br />(TDS) versus time for each of the sampled monitor wells. <br />The distribution of major ions in the ground water from each <br />monitoring well, as depicted on Figure 17, have remained <br />essentially the same since the data was last reported in 1981. The <br />• ground water collected from the monitor wells can be classified as <br />a calcium-magnesium-sulfate type. The SAR conductivity <br />87 <br />