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Mayo and Assocfa~es, Lt <br />• pile, and only two of these, GP-3 and GP-4, have long terns records. Two of the wells, GP-6 <br />and GP-7, were installed in 1998. Although no significant water level fluctuations or <br />chemical abnormalities have occurred during the 14 years of monitoring for both GP-3 and <br />GP-4, it is important to maintain the capability to detect future impacts of the lower refuse <br />pile on shallow groundwater resources. <br />Recommended Changes.• None <br />2.1.2 Barren Member Wells <br />Discussion: <br />The current monitoring plan includes wells SOM-13, SOM-45H-1, SOM-45H-2, SOM -80, <br />SW-1, SW-2, SW-3, SW-4, SW-5, and SW-6. About 20 years of monitoring data are <br />available for both SOM-13 and SOM-80, which are located above previously mined areas. <br />These wells have well screens that are open within 50 feet of ground surface and thus are <br />affected by annual groundwater rechazge events. Water levels in SOM-80 have never been <br />affected by mining activities and SOM-13 has not shown any effects since about 1981. <br />Neither well has had chemical abnormalities that can be attributed to mining. Although it is <br />unlikely that these wells will provide meaningful hydrogeologic information regarding future <br />mining impacts, there is no compelling reason to remove them from the monitoring plan as <br />long as they remain in good working order. A majority of water quality monitoring should <br />be eliminated as part of the monitoring plan for these two wells, because the water quality <br /> <br />Evaluation of [he West Elk Mine Monitoring Plan <br />29 January 1999 <br />Page 4 <br />