2014-11-17_PERMIT FILE - C1982056A ‎(2)‎

• Permit No: C1982056A
• IBM Index Class Name: Permit File
• Doc Date: 11/17/2014
• Section_Exhibit Name: 2.04 Environmental Resources
• Media Type: D
• Archive: Yes

•
Table 2.04 -1. Selected Observed Soil Core Parameters
Soil Core
#
Depth of Rooting
inches
Depth to Mottles
inches
Depth to Water.
inches
1
23
na
Na
2
25
12
41
3
8
na
na
4
9
na
na
5
48
na
na
6
S0
na
na
7
54+
na
na
8
40+
na
na
9
47
70
105
10
19
na
na
11
20
na
na
12
20
na
na
Maximum rooting depth at soil core #2 (Cumulic Cryaquoll) was observed into the seasonal high water table.
Soil mottling within the soil profile is a good indication of the depth of the seasonal high water table that can
fluctuate with the season and by year. Enhanced vegetation growth and plant species adapted to mesic and
riparian sites was also evident adjacent to soil core #2. Unconsolidated stream -laid sediments were observed at
25 inches and exhibited free water within these unconsolidated gravels and coarse sands. Similar soil
characteristics were observed in the small drainage channel bisecting the ventilation pad area in Section 17 (Map
2S).
The maximum rooting depth at soil core #9 (Menbar series) was observed to a depth of 47 inches with a
significant decline in roots noted at shallower depths due to calcareous root restricting horizons. Unconsolidated
•stream -laid sediments were observed below 105 inches and exhibited free water within these unconsolidated
gravels and coarse sands, however, no indicators of AVF soil characteristics were evident in this soil core within
the rooting zone. While this colluvial material may overlay water - bearing unconsolidated alluvial strata, these
colluvial materials are at a sufficient depth and contain shallow, calcareous root restricting horizons that prevent
any subirrigation potential. Reduced vegetation growth and production at this sampling site were evident from
the plant species that are more adapted to semi -arid, non- subirrigated sites. The field survey observed a distinct
soil, vegetation, and topographic boundary between the AVF and the upland portion of the study area containing
the proposed ventilation shaft facility access road.
•
Soil core descriptions, surface vegetation, and topographic relief indicate that the existing AVF boundary (as
previously defined in Exhibits 7b, 42a, and 46) along Fish Creek in Section 11 should be relocated as shown on
Map 1S. Approximately 800 feet of proposed road corridor in Section 11 has been relocated upgradient
approximately 100 feet to follow an existing abandoned farmstead access road and avoid potential wetland soils
along the stock pond shoreline. The remaining 6,314 feet of access road corridor from the fenceline at the south
end of the stock pond to the shaft pad have no soil limitations. Soil coring and geologic stratigraphy strongly
suggest that the entire ventilation shaft pad is located on a suitable upland Winevada soil series formed over
fractured sandstone bedrock parent material. While the previous AVF boundary (shown in green on Map 1S) is
located within the southwest corner of the shaft pad, the revised AVF boundary (shown in red on Map IS) lies
outside of the proposed shaft pad location. Southern and western portions of the 500 -foot buffer that overlay the
Fish Creek channel contain AVF and wetland soils (Map 1 S). No soil mapping activities were performed on the
west side of the railroad corridor within the 500 -foot buffer area since pad and shaft construction activities will
not cross the railroad tracks. As construction activities are limited to the ventilation pad and northern and
eastern halves of the buffer area, no AVF or wetland soils will be affected.
PR06 -07 2.04 -50.2 11/07/06