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' relative to those since 2004 showing a general relation to flow in Trout Creek. The lowest <br />chloride concentration in 2007 was <1.0 mg/L at monitoring site TR-D in October and the <br />high was recorded at multiple sites for numerous months with a value of 2.0 mg/L. The <br />lowest potassium concentration in 2007 was recorded at monitoring site TR-A in April with a <br />value of 0.9 mg/L and the high was recorded at monitoring site TR-D in July with a value of <br />3.2 mg/L. The lowest iron concentration in 2007 was recorded at monitoring site TR-B in <br />April with a value of 0.04 mg/L and the high was recorded at monrtormg site TR-A m July <br />' with a value of 0.23 mg/L. <br />' 4.0 Ground Water <br />As previously mentioned, groundwater is monitored for water quality and static water <br />level elevations at monitoring wells TR-1.5, TR-3, TR-4, WR-1 and TCS-1. The following <br />section discusses quality and static water level elevations of ground water at the Edna Mine. <br />4.1 Ground Water Elevations <br />Water levels in the alluvial wells at the Edna Mine have remained constant over the <br />1 period of record with minor fluctuations occurring seasonally. Elevations of the static water <br />level in the alluvial wells (TR-1.5, TR-3 and TR-4) and the West Ridge spoils well (WR-1) <br />are shown in Chart 21. In reviewing the data, it is apparent that the WR-1 has reached steady <br />' state and exhibits consistent seasonal fluctuations. The seasonal fluctuations result from <br />spring snowmelt causing a mounding of water in the perched aquifer which drains over the <br />summer via discharge from a spring on the lower portion of West Ridge near the elevation of <br />' Trout Creek. Monitoring Well TR-4 was broken off and plugged by livestock in July 2002, <br />preventing monitoring for the remainder of 2002. The well was repaired in the spring of <br />2003. <br />Ground water wells TR-1.5, TR-3, TR-4 and WR-1 all maintained levels and trends, a <br />slight decrease of water level during the annual sampling season, similar to historical data <br />during 2007. Ground water well elevations are provided in tabular format in Table 7. <br />4.2 Ground Water Quality <br />Comparisons of water quality data gathered from the alluvial wells at the Edna Mine <br />' must be exercised with caution due to the differing stratigraphic units intersected along Trout <br />Creek adjacent to the various wells. The alluvium in the vicinity of Well TR-1.5 intersects <br />stratigraphy above the Wadge coal seam while the alluvium in the vicinity of TR-3 intersects <br />' stratigraphy below the Wadge coal seam. Alluvium in the vicinity of TR-4 intersects even <br />lower stratigraphic units than those at TR-3. The influence from contact with the differing <br />lithology can not be quantified; therefore, differences between the wells may not be responses <br />' to mining related activities. <br />As previously mentioned, TR-4 was repaired in 2003. Groundwater samples from TR- <br />~ ° <br />