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Mayo and Assocla-es, LC <br />• discharge. Surface waters and groundwaters have been organized into l4 different surface <br />water and groundwater groups. The groups, organized in approximate descending order of <br />the geologic age of their respective rock units, are: <br />Stream flowing on: <br />1. Quaternary-age sediments <br />2. Mesaverde Formation sediments <br />3. Mancos Shale <br />Springs and wells springs in Quatemary-age sediments: <br />4. Quaternary-age sediments and landslide deposit springs <br />Springs and wells in Mesaverde Group bedrock: <br />5. Barren Member bedrock springs <br />• 6. Barren Member wells <br />7. Upper Coal Member springs <br />8. F-Seam wells <br />9. E-Seam wells <br />10. Lower Coal Member springs <br />1 1. Oliver Mine adit discharge <br />12. B-Seam wells <br />13. Rollins Sandstone wells <br />14. In-mine Rollins Sandstone discharges and wells <br />In Table 2 the parameter "n" opposite each sampling location indicates the number of <br />sampling events for that location. The n value opposite the mean for each group represents <br />• <br />Characterization of Groundwater Systems in the Vicinity of the West Elk Mine, Somerset. Colorado <br />29 January 1999 <br />Page 32 <br />