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West Elk Mine <br />A third ventilation shaft (Vent Shaft #3) was constructed during the summer and fall of 1997. <br />Vent Shaft #3 is a 10 -foot finished diameter shaft located approximately 400 feet east of the <br />electric borehole site (Map 53B). Information regarding the design, construction, and operation <br />of the ventilation facility is contained in Exhibit 69. <br />Degasification Site <br />A degasification borehole is located approximately 225 feet west of the electric borehole site in <br />Sylvester Gulch. It was constructed during the summer of 1997. This borehole is not currently <br />operating. More recent installations of methane drainage facilities in Sylvester Gulch and adjacent <br />areas, accommodates West Elk Mine's "in -mine" methane collection and transmission system. <br />Methane gas, captured in the mine, is collected and transported in poly -pipe up Ventilation Shaft <br />No. 3 and then vented and dispersed in the atmosphere. Some methane gas from the mine is used <br />to heat mine ventilation air at Ventilation Shaft No. 1, in a system completed in 2003. <br />Sylvester Gulch Mine- Dewatering and Treatment Facilities <br />MCC designed and constructed mine dewatering and treatment facilities located within the <br />Sylvester Gulch drainage. The system consists of one 18 -inch cased borehole, one 16 -inch <br />borehole (completed as a 12 -inch cased hole), and two 20 -inch cased boreholes, completed during <br />the summer of 1997 to access the operational sump in the northeast corner of the IONE Tailgate <br />of the B seam. Following the completion of ventilation seals on the IONE and IINE longwall <br />panels, this area became the NE Panels Sealed Sump. MCC utilizes the sealed sump as a large <br />volume mine -water storage area and pumps the water out of the mine through one of the <br />boreholes to Sylvester Gulch. The smaller borehole serves as a recirculation loop to the sump and <br />the two 20 -inch cased boreholes serve as alternate recirculation boreholes and /or boreholes for <br />water level indicators. Refer to the Probable Hydrologic Consequences section of the permit for <br />additional discussion of the sumps. <br />The treatment facilities include a dewatering pump station and treatment building, an aeration <br />pond, and a secondary settling pond. A detailed discussion of each facility is provided in Exhibit <br />69, Sylvester Gulch Facilities Area. <br />� Temporary Bathhouse <br />Facilities necessary to house additional personnel for E Seam construction and development <br />work were installed near Shaft #1 in Sylvester Gulch in late May 2005. These facilities were <br />I temporary in nature and designed to be removed when additional staffing is no longer required <br />i for E Seam development and construction needs. <br />All construction and installation work was performed within the existing disturbed areas at the <br />Shafts #1 and #2 area in Sylvester Gulch. There were no changes made to any existing <br />sediment controls, ditches or roads. Surfaces were restored to the existing compacted roadbase <br />when excavations for conduits and piping were completed. <br />2.05 -22 Rev. 06105, 01106. 03106, 04106 & 05106- PR10: 01109- hfR350; 04109- 78116: 04109- MR353: 05109- MR354; 08109- TR118; <br />08109- 7R119 <br />