2016-06-08_PERMIT FILE - C1982056A

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Once concrete pumping operations are completed, the temporary transfer line and batch -plant will be moved off-site, and the boreholes and associated disturbance areas will be reclaimed. Boreholes will be plugged and sealed in accordance with applicable State Engineer requirements. Any residual cuttings in the cuttings pit will be allowed to dry -out, and the cuttings pit will be completely backfilled. The pad area and road will be regraded to their approximate original configuration and to blend with the surrounding terrain, the temporary diversion ditch will be removed, stockpiled soil material will be replaced, and all disturbance areas will be reseeded with TC's standard Pastureland Seed Mixture, or an alternate seed mix, if requested by the surface landowner. 15 -Left Ventilation Shaft (TR11-77) As a result of progressive mine development in the Western Mining District (WMD) and expanded MSHA rock - dusting requirements, a new ventilation bleeder shaft and additional rock -dust transfer location will be needed to support ongoing mining operations. The proposed new ventilation shaft will be located off the existing light -use road serving the Fish Creek Water Treatment Facility in the SWIASEIA Section 24, TSN, R87W, as shown on Map 24. Development, construction, and installation of the ventilation shaft and associated ancillary facilities will involve the following sequential activities, as briefly described in the following sections and shown on the design drawings provided in Exhibit 49Y: • Completion of environmental and engineering investigations • Placement of disturbed area markers • Temporary drainage and sediment control measures • Recovery and stockpiling of available soil materials • Installation of drainage and sediment controls • Construction of a light -use road and site preparation for shaft pad • Construction of the shaft pad and lined cuttings pit • Installation of electrical distribution line and equipment • Excavation and construction of shaft collar structure • Blind -drilling and casing of the shaft • Construction of security fence around the shaft • Extension of entries from the 15 -Left gate -roads to connect to the shaft bottom • Installation of rock -dust drop pipe, rock -dust tank, and controls • Final clean-up and dressing of road and site pad Site-specific investigations required for design and permitting of the new ventilation shaft and pipeline include a cultural resource survey of potential disturbance areas, identification and marking of wetland limits, and wildlife consultation. The cultural resource survey was conducted by Metcalf Archaeological Consultants, with results summarized by the survey report included in Exhibit 6T. The wildlife consultation is documented by a consultation letter from the CDOW, provided in Exhibit 23C. The perimeter of all areas affected by surface facilities construction will be clearly marked before initiating any surface disturbance. The proposed shaft pad, cuttings pit, and soil stockpile area will have maximum dimensions of approximately 200 x 350 feet (1.6 acres) with cut and fill slopes. The light -use road, will add approximately 0.7 acres of disturbance, for a total disturbed area of approximately 2.3 acres. The light -use road disturbance corridor will be approximately 750 feet long and 40 feet wide. Actual constructed road width (finished top width) is expected to be approximately 24 feet. Refer to Exhibit 49Y, 15LT Ventilation Shaft Installation — Design Drawings, for details on the road, and the road profile and cross- section. The proposed light -use road crosses upland areas where road construction will involve removal of any large vegetation and stripping and stockpiling of other vegetation, soil, and organic materials. In order to reestablish effective vegetative cover, TCC will recover and stockpile a maximum of 18 inches of soil material from shaft and road disturbance areas. With a total road disturbance area of approximately 0.7 acres, approximately 1,700 CY of soil material will be salvaged from the road corridor, and approximately 3,900 CY from the 1.6 acre shaft pad and associated disturbance areas. Prior to initiation of soil salvage operations, temporary sediment control measures (silt fence, wattles, and/or other, as appropriate) will be installed. Soil salvage volumes are indicated on Table 49A. Soil material from the road corridor and other disturbance areas will be stockpiled in a central soil stockpile areas as shown on the design drawings in Exhibit 49Y. Natural vegetative materials (mulch) MR14-283 2.05-45.22 10/30/14