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Mayo and Assoslalea, LC <br />. Recornn:ended Ckanges: <br />Remove water quality monitoring, except of the required parameters of TDS, EC, pH, and <br />iron, from the monitoring plan for those wells which have more than 5 years of water quality <br />data. Remove well SOM-C-72-H from the plan because the bottom of the well has been <br />mined through. <br />2.1.3 Rollins Sandstone Wells <br />Discussion: <br />The current monitoring plan includes two wells, SOM-128-H and So. W-3. The investigation <br />offault-related groundwater inflows from the Rollins Sandstone (Mayo and Associates, <br />• 1998) demonstrates that Rollins Sandstone monitoring wells do not provide predictable <br />infornration regarding Rollins Sandstone groundwater conditions. Therefore Rollins <br />Sandstone wells should not be monitored or replaced once [hey become damaged. <br />The stable isotopic composition of water from well SOM-128-H indicates that the well <br />contains appreciable evaporative water. The water level hydrograph also exhibits a very <br />unusual behavior that cannot be attributed to natural causes. The unusual conditions are <br />likely the result of well casing damage. Therefore the well does not provide useful <br />information and should be removed from the monitoring program. <br />C~ <br />Evaluation of [he West Elk Mine Monitoring Plan <br />29 January 1999 <br />Page 7 <br />