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Ground Water <br />Monitoring Programs at Nuc1a and Nurla East. The locations of all monitoring wells within <br />and adjacent to the Nucla P'i ne and Nucla East mining area can be found on Exhibit 1, 1988 <br />Nucla AHR. Table 5 presents a summary of monitoring well locations and completion <br />information. Monitoring activities (water level measurements and water quality sampling) <br />conducted during the 1989 water year at monitoring wells associated with the Nucla Mine <br />and Nucla East mining area were consistent with the monitoring plans outlined in Appendix <br />19-1 of the revised Nucla PAP. Peabody received two special requests far additional ground <br />water monitoring from CMLRD in 1989. In a letter dated March 17, 1989,, Mr. Carl Mount of <br />CMLRD requested Peabody to conduct a one-time sampling of six of the new (1987-19881 Nucla <br />East Piezometers during the 1989 spring irrigation season (April-June). This sampling was <br />accomplished on May 16-17, 1989 by Peabody personnel, and included sampling a total of <br />seven wells which monitor the three major aquifers (Overburden, Dakota Coal, and <br />Underburden). CMLRD also requested continuance of quarterly baseline ground water <br />sampling of the monitoring wells associated with the Nucla East mining area rather than <br />the semi-annual monitoring proposed by Peabody in the 1988 Nucla PAP (CMLRD review letter <br />dated July 5, 1989). Peabody honored this request by conducting quarterly ground water <br />sampling at the Nucla East mining area throughout the 1989 water year. <br />The following sections briefly describe ground water monitoring artiviities conducted and <br />data collected at both the Nucla Mine and Nucla East mining area during the 1989 water <br />year. <br />Water Levels. All water level data collected during the 1989 water year at monitoring <br />wells associated with the Nurla Mine and Nuc1a East mining area are contained in Appendix <br />F. Water level hydrographs have been included in Appendix F for select monitoring wells. <br />Note that water levels were not obtained during June-September, 1989 for Nucla East wells <br />CW-N16, N16P1, N17P1, N18 and N18P1 (W. Burbridge property) due to denied access to that <br />property. <br /> Water Chemistry. Ground water quality data for samples roll ec ted at monitoring wells <br /> associated with the Nurla Mine and Nucla East mining area during the 1989 water year are <br /> presented in Appendix G. Also included are statistical reports for individual wells and <br /> aquifers. Water quality data for the "Burbridge" wells were not obtained during the <br /> fourth quarter 1989 water year, again due to denied access. <br />13 <br />