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use are surface cracking and subsidence troughs on the surface <br />pile. These areas would require regrading and filling to prevent <br />impoundment of water or increased localized seepage. <br />2.6.4 Fresh Water Pond No. 3 and Sedimentation Pond No. 4 <br />Fresh water pond No. 3 is a completely excavated pond <br />located above the main entry. The location of this structure is <br />outside the limits of the planned retreat (see mine plan map). <br />The subsidence produced by development extraction is expected to <br />produce very little subsidence or surface cracking during the <br />life of the pond. In addition, the pond is expected to be <br />removed and the area reclaimed prior to subsidence. <br />The sedimentation pond is located outside the limits of <br />mining. Although the expected angle of draw (20-250) could reach <br />• the pond area, the magnitude of subsidence and surface strains <br />would not be significant and would not cause any impacts to the <br />structure. <br />2.6.5 Powet Substations and Power Lines <br />The possibility exists for adjacent power poles and <br />substations to be unevenly influenced. The result may be reduced <br />electrical clearances, due to tilting, and/or reduced ground <br />clearance, due to subsidence. Resultant strains in the power <br />lines would (in the opinion of officials from Southern Colorado <br />Power, who maintains the line) exceed the safe limits of the <br />lines. This could possibly result in material damage which <br />requires mitigating measures. The mitigating measures for this <br />condition are discussed in Section 3.0. <br />. 2.6.6 Florence Cityr Water Line <br />The Florence City water line within the permit area consists <br />21 <br />