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Colowyo Coal Company <br />2013 Annual Reclamation and Hydrology Report <br />Evaluation of2013 data for MT -95 -02 Well <br />One result from 2013 sampling for pH was a maximum recorded value for the monitoring <br />period. Trend line analysis determined no significant correlations over time. pH levels <br />have been very stable during the monitoring period. <br />SPOIL SPRING DEVELOPMENT <br />A limited number of low impact spoil springs may develop occasionally, but their aerial <br />extent and low level or non - existent surface flow will have a very minor impact on <br />surface (and shallow groundwater /perched aquifer) water quality and quantity in the <br />future. Colowyo is not aware of any springs that have developed due to rain/snowmelt <br />percolating through the spoil and emerging down gradient. <br />Several active native springs have been identified on the reclaimed surface at the <br />Colowyo Mine. These springs are the result of groundwater movement from <br />groundwater complexes that were present pre- mining, whose waters pass through <br />regraded overburden subsurface from the highwall (non -mined areas), and emerge at a <br />location down gradient in the reclaimed surface. <br />Colowyo has detected four springs that originate from non -mined areas in the highwall <br />and percolate through the regraded spoil and emerge on the reclaimed surface. Two <br />springs are located just south of the East Taylor Pond in reclamation parcel WP014. <br />Each of these springs is located where the final highwall was regraded to the approved <br />PMT. Two additional springs have been located in the East Pit reclamation parcel <br />EP057, south of the Final East Pit Ditch where the final highwall was regraded to PMT. <br />Page 2 -8 <br />