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West Elk Mine <br />Seasonal Variations in Groundwater Ouality <br />Data from selected wells in the permit area with relatively long records covering different <br />seasons were evaluated for seasonal trends. In general, the parameters evaluated do not <br />exhibit defined seasonal changes in concentration. Levels of TDS, TSS, and pH do not vary <br />appreciably over the year. This is due to the poor aquifer characteristics of the formations in <br />the permit area and lack of recharge and connection to surface water sources. However, wells <br />installed in shallow sediments including alluvium show seasonal water quality and water level <br />trends. Typically, concentrations of iron and manganese are elevated during fall and winter month's <br />season along with low water levels. <br /> <br /> <br />2.04-75 Revised June 2005PRlO, March 2006; Rev. Apri12006 PRIO, Sep. 2007PR12