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• Appendices F and G are water quality statistics reports for surface water monitoring sites at both the Nucla and Nucla East mining areas. Appendix F includes statistics on total values for metals, while Appendix G includes statistics on total recoverable values for the same parameters. It should be noted that statistics were performed on all historic data for each site, which may or may not include historic values determined using different detection limits than are currently being employed by Peabody's present contract laboratory (ACZ Laboratories, Steamboat Springs, Colorado). The computer program used to calculate the statistics and generate these reports includes those analyses results reported as "less than" the detection limit, resulting in means and minimum values of parameters not representative of the parameter sample population. Peabody is currently working on rectifying this problem and will submit more accurate statistical reports in future AHR's. Cround Water Monitoring Programs at Nucla and Nucla East. The locations of all monitoring wells within and adjacent to the Nucla and Nucla East mining areas are shown on Exhibit 1. Presented • on Table 5 are all ground water monitoring well site and completion summaries for the Nucla and Nucla East mining areas. Explanations and interpretations of the data presented in this section are as succinct as possible. A detailed explanation of the hydrologic monitoring program will be presented in the forthcoming Nucla East Mine Permit Application. New Wells. During the 1987 water year three additional spoil monitor wells (CW-N26 _ through CW-NZB) were installed at the Nucla Mine to help better define the spoils aquifer system. In addition to the three spoil monitor wells at Nucla Mine, Peabody also installed Monitor Well GW-N4R as a replacement well for CW-N4. To better define baseline ground water conditions at the Nucla East mining area, Peabody completed five exploration bore holes into monitor wells. Those wells are CW-N30 through GW-N34. Completion summaries for the newly installed monitor wells are presented on Table 5, and lithologic logs and well completion summaries (including drawings for each of the new monitor wells) are contained in Appendix H. . Water Levels. All water level data collected through the 1987 water year from the various aquifers within an adjacent to the Nucla and Nucla East mining areas are presented in 13