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Peabody will conduct annual spring and seep surveys during the dry periods of the year, <br /> early spring or late fall . The results of the annual spring and seep surveys will be <br /> reported in the Annual Hydrology Report for Nucla and Nucla East. <br /> As mining progresses at Nucla Mine, or begins at the proposed Nucla East mining area, the <br /> monitoring program will be reduced or expanded as necessary to properly track any impacts <br /> that may occur as a result of mining. As any changes occur at Nucla and Nucla East, they <br /> will be reflected as minor revisions to the existing permit. The above described on-going <br /> ground water monitoring program for the entire Nucla operation updates the existing <br /> monitoring program as described in the 1987 Annual Hydrology Report. <br /> Postmining Ground Water Monitoring Program. Upon completion of mining at Nucla Mine in <br /> 1989, a postmining monitoring program will be implemented. Peabody will consult with the <br /> CMLRD prior to implementation of the program. <br /> Proposed Additional Monitoring Sites <br /> Peabody proposes additions to the ground and surface water monitoring program for the <br /> Nucla and Nucla East mining areas to address three concerns. First, further resolution of <br /> potentiometric surfaces and ground water quality fluxes, particularly to the south and <br /> west, is desired. Second, a means of monitoring the alluvial aquifer in Tuttle Draw is <br /> needed. Finally, additional ground and surface water monitoring in the immediate vicinity <br /> of the Nucla East pits will provide input to assist in the refinement of the estimates of <br /> impact to water rights proximate to the area. <br /> The first two concerns are proposed to be addressed by the installation of six monitor <br /> wells: 1) one in the alluvium; 2) three in the overburden; 3) one in the coal; and 4) one <br /> in the underburden. These wells are denoted on Exhibit 7-1 as open circles. The third <br /> concern is to be addressed by five proposed piezometers and one proposed surface water <br /> monitoring site, which will be installed in two phases. The three piezometers and one <br /> surface water monitor, located immediately adjacent to the first three years of mining <br /> disturbance at Nucla East, are proposed to be completed sometime during the first three <br /> years of mining. The other two piezometers are proposed to be completed during the fourth <br /> or fifth years of mining. <br /> The five piezometers, shown as open circles with center dots on Exhibit 7-1, will be <br /> 15-22 Revised 04/11/88 <br />