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6RT, 7RT, 2MN and SWMD Thickener Underflow Borehole and Pineline Installations (TR09-06, TR16-86,
<br />MR10-242 MR10-248, MR13-270, MR13-273, MR17-303, MR17-306) =Tile proposed 6RT, 7RT, and a portion
<br />of one of one of the SWMD drill -pads, and portions of the associated roads are in areas that have previously been
<br />disturbed by County road construction, railroad construction, or other previous activities. It is unknown whether
<br />soil materials were salvaged and replaced in these areas, however, in most cases a reestablished sagebrush -meadow
<br />vegetation community exists over most of the proposed pad, road, and pipeline areas. The corridors for the
<br />proposed thickener underflow pipelines also cross previously disturbed areas, existing disturbance areas (mine
<br />facilities and railroad construction), and newly disturbed areas. The 2MN and proposed SWMD drill -pads and
<br />roads are in areas previously disturbed by mining -related activities, however, some soil materials remain in these
<br />areas. For the drill -pads, and associated pipelines and roads, available soil materials will be salvaged and
<br />stockpiled for use in site reclamation. Small temporary soil stockpiles will be established adjacent to the pad areas
<br />and roads for any limited soil (estimated at approximately 300 cy at each site) that may be recovered from the
<br />borehole pads and roads.
<br />19RT Mine Dewaterina Borehole and Pipeline - Given the proximity of existing ranch roads, TCC does not plan
<br />or anticipate the need for new road construction to access the 19RT Dewatering Borehole drill -site. With dry
<br />ground conditions, drilling equipment and supplies should be able to travel the short distance overland from the
<br />existing roads to the drill -site, without significant surface disturbance. Both the shaft pad and pipeline corridor are
<br />located in an upland areas. For both the shaft pad, and along the 6,200 -foot pipeline corridor, construction will
<br />involve removal of any large vegetation and stripping and stockpiling of other vegetation, soil, and organic
<br />materials. Given an average soil depth of approximately 6 inches in the upland areas, a pad area of approximately
<br />0.35 acres, and a total pipeline disturbance area of approximately 7.2 acres, approximately 300 cubic yards of soil
<br />material will be salvaged from the pad area, and 5,750 cubic yards from the pipeline corridor. Soil from the
<br />pipeline corridor will be removed and windrowed along one side of the pipeline corridor, and soil from the pad area
<br />will be placed in a stockpile within the borehole pad for future reclamation use. The soil salvage volumes are
<br />indicated on Table 49A. Natural vegetative materials (mulch) incorporated into the topsoil, and seeding with the
<br />topsoil stockpile stabilization seed mixture, identified on page 2.05-121, will stabilize and protect the stockpiled
<br />soil materials.
<br />15RT Ventilation Shaft (TR11-77) - An existing two -track road extends from the Fish Creek Water Treatment
<br />Facility road to the proposed shaft site, however, it does not appear that any soil material was salvaged from the
<br />road corridor. Therefore, for both the light -use road and shaft pad, construction will involve removal of any large
<br />vegetation and stripping and stockpiling of other vegetation, soil, and organic materials. TC will recover and
<br />salvage a maximum of 18 inches of soil from the road and pad areas. With a pad area of approximately 1.6 acres,
<br />and a road corridor of approximately 0.7 acres, a maximum volume of approximately 5,600 cubic yards of soil
<br />material will be salvaged and placed in stockpile for future use in reclaiming the site. A temporary soil stockpile
<br />will be established on the east end of the pad area, natural drainage will be diverted around the stockpile by a short
<br />diversion ditch, and the natural vegetative materials incorporated into the soil, and seeding with the topsoil
<br />stockpile stabilization seed mixture, will stabilize and protect the stockpiled soil materials.. Soil salvage volumes
<br />are indicated on Table 49A.
<br />16LT Utility Borehole (TR11-78) — The associated light -use road follows an existing two -track ranch road for part
<br />of its length, however, it does not appear that any soil material was salvaged from the road corridor. Therefore, for
<br />both the light -use road and borehole pad, construction will involve removal of any large vegetation and stripping
<br />and stockpiling of other vegetation, soil, and organic materials. The road is located near the top of a ridgeline
<br />where soil development is limited, so TC will recover and salvage a maximum of 12 inches of soil from the road
<br />and pad areas. With a pad area of approximately 2.2 acres, and a road corridor of approximately 6.1 acres, a
<br />maximum volume of approximately 10,900 cubic yards of soil material will be salvaged and placed in stockpile for
<br />future use in reclaiming the site. A temporary soil stockpile(s) will be established on the east end of the pad area
<br />adjacent to the road, where natural drainage will route around the stockpile(s) due to the existing natural drainage
<br />configuration, and the natural vegetative materials incorporated into the soil, and seeding with the topsoil stockpile
<br />stabilization seed mixture, will stabilize and protect the stockpiled soil materials.. Soil salvage volumes are
<br />indicated on Table 49A.
<br />5MN Borehole and Prelines (MR14-283, MR15-288) — Construction of the light -use road and pad for the 5MN
<br />Cement Borehole will involve removal of any large vegetation and stripping and stockpiling of other vegetation,
<br />soil, and organic materials. The road and pad are located along the crest of a minor ridgeline where soil
<br />MR 17-306 2.05-84.13 03/16/17
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