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Mayo and Assoelales, LC <br />• compositions of surface waters and groundwaters, and 4) geologic infornlation. Specific <br />methods of investigation are described below. <br />2.2.1 Maps and Reports <br />Existing published and unpublished hydrologic, hydrogeologic, and geologic reports and <br />maps were obtained and reviewed. Electronic drawings showing monitoring locations and <br />geologic maps were obtained from MCC. The locations and geologic formations of <br />individual hydrologic monitoring sites were determined from these maps and through <br />discussions with MCC personnel. <br />2.2.2 Compilation of Historic Water Quality, Piezometric, and Stream Flow Data <br />• An electronic database containing MCC's historical water quality, piezometric, and stream <br />flow data ryas obtained and reviewed. The database contains hydrologic information from <br />147 monitoring locations. From this database, mean value tables were generated and <br />statistical analyses were performed. <br />2.2.3 Collection and Analysis of Additional Solute and Isotopic Data <br />Between June and October 1998, 35 water samples were collected for stable and unstable <br />isotopic analysis from springs, wells, and streams. MCC personnel performed sample <br />collection during routine hydrologic monitoring. Additionally, 18 water samples, mostly <br />from within the West Elk Mine, were collected and analyzed for stable and unstable isotopic <br />composition as part of a previous investigation (Mayo and Associates, 1998). <br />C 1 <br />Characterization of Groundwater Systems in the Vicinity of the West Elk Mine, Somerset, Colorado <br />29 January 1999 <br />Page 7 <br />