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18 Right Ventilation Shaft (TR04-44) _Approximately 4,400 feet of the access road crosses upland areas, with
<br />the remaining 2,700 feet crossing lowland areas where road construction will involve removal of any large
<br />vegetation and stripping and stockpiling of other vegetation, topsoil, and organic materials. Similarly, the shaft pad
<br />is located in an upland area. Given an average topsoil depth of approximately 6 inches in the upland area and a
<br />total road disturbance area of approximately 5.7 acres, approximately 4,600 cubic yards of topsoil will be salvaged
<br />from the road corridor, and 2,000 cubic yards from the 2.5 acre pad area. Prior to initiating soil removal, the stream
<br />buffer zone will be marked with identifying signs to prevent surface disturbance within buffer zone areas. The
<br />topsoil from the road corridor was initially windrowed adjacent to the road and topsoil from the pad area was
<br />placed in a stockpile adjacent to the shaft pad and within the road corridor, for future reclamation use. As a result
<br />of concerns related to protection of windrowed topsoil from erosion and contamination, a decision was made to
<br />recover topsoil from the windrows and place it in stockpile. The topsoil salvage volumes are indicated on Table
<br />49A. Seeding with the topsoil stockpile stabilization seed mixture identified on page 2.05-121 will stabilize the
<br />windrowed and stockpiled topsoil.
<br />6 -North Mains Ventilation Shaft (TR05-48) -_Along the 2,930 -foot access road, construction will involve
<br />removal of any large vegetation and stripping and stockpiling of other vegetation, topsoil, and organic materials.
<br />Similarly, the shaft pad is located in an upland area. Given an average topsoil depth of approximately 6 inches in
<br />the upland area and a total road disturbance area of approximately 2.4 acres, approximately 1,940 cubic yards of
<br />topsoil will be salvaged from the road corridor, and 8,954 cubic yards from the 11.1 acre pad area. Prior to
<br />initiating topsoil removal activities, wetland buffer zones will be marked with identifying signs to prevent surface
<br />disturbance within the buffer zone areas. The topsoil from the road corridor will be recovered and placed in a
<br />stockpile at the north end of the road corridor beyond the edge of the 35 -foot road disturbance area, and topsoil
<br />from the pad area will be placed in a stockpile within the shaft pad on the southwest edge of the pad for future
<br />reclamation use. The topsoil salvage volumes are indicated on Table 49A. Natural vegetative materials (mulch)
<br />incorporated into the topsoil, and seeding with the topsoil stockpile stabilization seed mixture identified on page
<br />2.05-121 will stabilize the stockpiled topsoil.
<br />6RT, 7RT, 2MN, WMD and SWMD Thickener Underflow Borehole and Pipeline Installations (TR09-06,
<br />TR16-86, TR17-88TR18-90, MR10-242, MR10-248, MR13-270, and MR13-273) _The proposed 6RT, 7RT, and
<br />a portion of 12, 14, 15, 16, & 17 -Left and SWMD 2SW drill -pads, and portions of the associated roads are in areas
<br />that have previously been disturbed by County road construction, railroad construction, or other previous activities.
<br />It is unknown whether soil materials were salvaged and replaced in these areas, however, in most cases a
<br />reestablished sagebrush -meadow vegetation community exists over most of the proposed pad, road, and pipeline
<br />areas. The corridors for the proposed thickener underflow pipelines also cross previously disturbed areas, existing
<br />disturbance areas (mine facilities and railroad construction), and newly disturbed areas. The 2MN and proposed
<br />SWMD drill -pads and roads are in areas previously disturbed by mining -related activities, however, some soil
<br />materials remain in these areas. For the drill -pads, and associated pipelines and roads, available soil materials will
<br />be salvaged and stockpiled for use in site reclamation. Small temporary soil stockpiles will be established adjacent
<br />to the pad areas and roads for any limited soil (estimated at approximately 300 cy at each site) that may be
<br />recovered from the borehole pads and roads.
<br />19RT Mine Dewatering 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 />TR18-90 2.05-84.13 04/05/18
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