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When the holes are no longer needed, they will be grouted from the bottom of the casing to within three feet of the <br />surface. The remaining four feet of casing will be cut off and discarded and then the area graded, topsoiled and <br />seeded as per the approved plan. The holes will be located within the existing vent shaft pad disturbance area. <br />Concurrent with road construction, a power distribution line was extended from the existing substation to the pad - <br />mounted transformer at the shaft site. The power distribution line is approximately 3,600' long with a total of 12 <br />power poles. <br />In order to minimize potential environmental and aesthetic impacts associated with the NW Mains ventilation shaft <br />and fan installation, surface drainage at the shaft site is handled by an upgradient diversion ditch, perimeter berms, <br />pad topsoil stockpile collection ditches, gravel surfacing, and a sump with rock check dam and vegetative filter, <br />under an SAE. The limited road drainage is handled by designed drainage structures. Active use areas are graveled <br />MR10 -247 2.05 -45.2a 09/17/10 <br />