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Introduction <br /> The information assembled in this 1987 Annual Hydrologic Report includes data collected <br /> from approved monitoring sites established at Peabody Coal Company's Nucla Mine (Permit <br /> No. C-81-008). In addition, hydrologic baseline data collected from monitoring sites <br /> established at Peabody's proposed Nucla East mining area are presented. Surface water <br /> information assembled include instantaneous and mean daily discharge measurements, NPDES <br /> discharge monitoring reports, water quality analysis results and water quality statistics <br /> reports. Presented ground water information include monthly water level measurements, <br /> well completion specifications, water quality analysis results and water quality <br /> statistics reports. A revised monitoring site map encompassing both the Nucla Mine and <br /> Nucla East mining areas accompanies this report. <br /> Reported surface and ground water information collected at monitoring sites associated <br /> with Peabody's Nucla Mine encompass the 1987 water year (October 1, 1986 through September <br /> 30, 1987), with the exception of ground water level data and water quality statistics <br /> reports. These exceptions include all historical data for Nucla monitoring sites. <br /> Surface and ground water information reported for monitoring sites established in <br /> Peabody's Nucla East area include data collected from July of 1986 through September of <br /> 1987 (Baseline Hydrologic Monitoring). <br /> The following sections present discussion about monitoring activities conducted during the <br /> 1987 water year as part of the operational monitoring program approved for Peabody's Nucla <br /> Mine. Minor modifications of this program (i .e., construction of spoils wells) and <br /> results of special monitoring (i.e., analysis for silver and chromium) are also included. <br /> _ An update of monitoring activities performed at baseline monitoring sites established at <br /> Peabody's Nucla East area is also provided. <br /> Finally, upon perusal of this report it will be evident that little to no interpretation <br /> of data is included. Interpretation and discussion of the data presented in this report <br /> will be included in the Hydrologic Description, Hydrologic Monitoring Program, and <br /> Probable Hydrologic Consequences sections of the Nucla East Permit Application Package, <br /> which is expected to be submitted to CMLRD by March 31, 1987. Future Annual Hydrologic <br /> Reports for Nucla and Nucla East will include monitoring data discussion and <br /> interpretation for both mining areas in a similar combined report format. <br /> 1 <br />