Dixie Meadows DraftEA
Dixie Meadows DraftEA
Dixie Meadows DraftEA
ENVIRONMENTAL ASSESSMENT
DOI-BLM-NV-C010-2016-0014-EA
Cooperating Agencies:
Nevada Department of Wildlife
US Fish and Wildlife Service
US Navy, Naval Air Station Fallon
May 2017
It is the mission of the Bureau of Land Management to sustain the health, diversity,
and productivity of the public lands for the use and enjoyment of present and future
generations.
DOI-BLM-NV-C010-2016-0014-EA
TABLE OF CONTENTS
Chapter Page
3.6 Vegetation.....................................................................................................................................3-46
3.6.1 Affected Environment .................................................................................................3-46
3.6.2 Environmental Consequences ..................................................................................3-48
3.7 Wildlife and Key Habitat ...........................................................................................................3-50
3.7.1 Affected Environment .................................................................................................3-50
3.7.2 Environmental Consequences ..................................................................................3-53
3.8 BLM Sensitive Species ................................................................................................................3-57
3.8.1 Affected Environment .................................................................................................3-58
3.8.2 Environmental Consequences ..................................................................................3-78
3.9 Wetlands and Riparian Areas ..................................................................................................3-88
3.9.1 Affected Environment .................................................................................................3-88
3.9.2 Environmental Consequences ..................................................................................3-90
3.10 Invasive, Nonnative, and Noxious Weed Species ...............................................................3-95
3.10.1 Affected Environment .................................................................................................3-95
3.10.2 Environmental Consequences ..................................................................................3-96
3.11 Visual Resources .........................................................................................................................3-96
3.11.1 Affected Environment .................................................................................................3-96
3.11.2 Environmental Consequences ............................................................................... 3-101
3.12 Cultural Resources .................................................................................................................. 3-103
3.12.1 Affected Environment .............................................................................................. 3-103
3.12.2 Environmental Consequences ............................................................................... 3-105
3.13 Native American Religious Concerns ................................................................................. 3-107
3.13.1 Affected Environment .............................................................................................. 3-107
3.13.2 Environmental Consequences ............................................................................... 3-110
3.14 Travel Management ................................................................................................................. 3-111
3.14.1 Affected Environment .............................................................................................. 3-111
3.14.2 Environmental Consequences ............................................................................... 3-112
3.15 Land Use Authorizations ....................................................................................................... 3-112
3.15.1 Affected Environment .............................................................................................. 3-112
3.15.2 Environmental Consequences ............................................................................... 3-113
3.16 Wilderness Study Areas ......................................................................................................... 3-113
3.16.1 Affected Environment .............................................................................................. 3-113
3.16.2 Environmental Consequences ............................................................................... 3-114
3.17 Public Health and Safety and Hazardous Materials .......................................................... 3-114
3.17.1 Affected Environment .............................................................................................. 3-114
3.17.2 Environmental Consequences ............................................................................... 3-115
3.18 Socioeconomics ....................................................................................................................... 3-115
3.18.1 Affected Environment .............................................................................................. 3-115
3.18.2 Environmental Consequences ............................................................................... 3-116
4. CUMULATIVE IMPACTS ................................................................................................. 4-1
4.1 Past, Present, and Reasonably Foreseeable Future Actions ............................................... 4-1
4.2 Air Quality ...................................................................................................................................... 4-2
4.3 Water Resources .......................................................................................................................... 4-3
4.4 Soil Resources ............................................................................................................................... 4-3
4.5 Vegetation....................................................................................................................................... 4-4
4.6 Migratory Birds, Wildlife and Key Habitat, and BLM Sensitive Species ........................... 4-4
4.7 Invasive, Nonnative, and Noxious Weeds .............................................................................. 4-5
4.8 Wetlands and Riparian Areas .................................................................................................... 4-6
4.9 Visual Resources ........................................................................................................................... 4-7
TABLES Page
1 Leases Within the Combined Dixie Meadows Geothermal Unit Area (NVN-89456X) ........... 1-5
2 Existing and Permitted Wells .................................................................................................................... 1-5
3 Potential Regulatory Permits and Approvals.......................................................................................1-12
4 Area of Disturbance (Proposed Action) ................................................................................................ 2-4
5 Proposed Wells ..........................................................................................................................................2-13
6 Geothermal Lease Stipulation Summary ..............................................................................................2-32
7 Area of Disturbance (Alternative 1) .....................................................................................................2-37
8 Supplemental Authorities and Rationale for Detailed Analysis for the Proposed Action .......... 3-2
9 Resources Other Than Supplemental Authorities ................................................................................ 3-4
10 Seep and Spring Field Data, September 27, 2016 ..............................................................................3-12
11 MW-1 Sampling Results; May 2012 and September 2016 ...............................................................3-15
12 Comparison of Geothermal and Non-Geothermal Groundwater Quality Near the
Terra-Gen Dixie Valley Geothermal Facility.......................................................................................3-18
13 Water Rights Summary .............................................................................................................................3-19
14 Gen-Tie Soil Map Units (Miles) ..............................................................................................................3-26
15 Birds of Conservation Concern .............................................................................................................3-41
16 Game Birds Below Desired Condition .................................................................................................3-42
17 SWReGAP Landcover Types ..................................................................................................................3-47
18 Typical Wildlife Species Associated with Habitats in the Project Area........................................3-50
19 BLM Sensitive Species Observed or Potentially Occurring in the Project Area ........................3-59
20 Degree of Contrast Rating ......................................................................................................................3-98
21 Key Observation Points ...........................................................................................................................3-98
22 Key Observation Point Viewsheds ........................................................................................................3-99
23 List of Preparers........................................................................................................................................... 5-2
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment iii
Table of Contents
FIGURES Page
APPENDICES
A Geothermal Lease Stipulations
B Greater Sage-Grouse Required Design Features
C Bird and Bat Conservation Strategy
D Biological Survey Reports
E KOP Locations, Visual Contrast Rating Worksheets, and Photo Logs
F PEIS for Geothermal Resources Leasing in the Western United States, Appendix D: Best
Management Practices and Mitigation Measures
C degrees Celsius
CCD BLM Carson City District Office
CEQ Council on Environmental Quality
CFR Code of Federal Regulations
cfs cubic feet per second
CRMP Consolidated Resource Management Plan
CWA Clean Water Act
EA environmental assessment
ESA Endangered Species Act of 1973
F degrees Fahrenheit
FLPMA Federal Land Policy and Management Act of 1976
FONSI Finding of No Significant Impact
1.1 INTRODUCTION
ORNI 32, LLC (ORNI 32), a subsidiary of Ormat, is proposing the Dixie
Meadows Geothermal Utilization Project in Dixie Valley, approximately 43 miles
northeast of Fallon in Churchill County, Nevada (see Figure 1, Project
Location). ORNI 32 proposes to construct up to two geothermal power plants;
drill, test, and operate up to 15 geothermal production and injection well sites
and 8 core hole sites; construct and operate pipelines to carry geothermal fluid
between well fields and the power plants; and construct either a 120-kilovolt
(kV) or a 230-kV gen-tie line and associated structures. The gen-tie would be
constructed along one of two routes; one extending to the northeast to Jersey
Valley, and one extending to the south to the NV Energy power line near US
Highway 50. ORNI 32 has not yet finalized gen-tie interconnection agreements;
both routes are analyzed in this EA.
The proposed power plants and related wells and pipelines would be located on
geothermal leases that are on public lands administered by the BLM, CCD,
Stillwater Field Office, and a segment of US Navy lands that have mineral rights
owned by Ormat. The northern portion of the first gen-tie line option would be
located off the leases, but on public lands administered by the BLM Winnemucca
District Office, Humboldt River Field Office and a portion of US Navy lands.
This gen-tie would have a voltage of 120-kV.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 1-1
1. Introduction/Purpose and Need
1-2 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
1. Introduction/Purpose and Need
The gen-tie facilities would connect the proposed Dixie Meadows geothermal
power plants into the NV Energy power grid so that electricity can be delivered
to consumers. Under the first routing option, the gen-tie line would originate at
each plants substation, extend about 48.1 miles to the northeast, and connect
to an existing power line at Ormats Jersey Valley Geothermal Power Plant. This
gen-tie route would parallel the existing Oxbow power line for the first 16 miles
from the plant sites to the Terra-Gen Dixie Valley power plant. From there to
Jersey Valley, it would mostly follow existing gravel roads, up to the Jersey
Valley plant where it would tie into an existing 120-kV transmission line. The
gen-tie line would be in both Churchill and Pershing Counties.
The second gen-tie route under consideration in this EA would also connect the
proposed Dixie Meadows geothermal power plants into the NV Energy power
grid, but it would extend approximately 31.3 miles to the south. At its southern
terminus, this gen-tie would connect to NV Energys Fort Churchill to Gonder
230-kV line at the proposed Middlegate Substation.
1
For more information, refer to https://frtcmodernization.com/.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 1-3
1. Introduction/Purpose and Need
1.2 BACKGROUND
The Combined Dixie Meadows Geothermal Unit Area (NVN-89456X) was
created by combining the Dixie Hope and Dixie Meadows geothermal lease
units. It also contains mineral rights to 760 acres of US Navy land known as the
Lamb Mineral interests.
Two EAs have been completed for lands within the Combined Dixie Meadows
Geothermal Unit Area. Findings of No Significant Impact (FONSIs) and Decision
Records for the TGP Geothermal Exploration EA (DOI-BLM-NV-C010-2010-
0010-EA) and the Dixie Meadows Geothermal Exploration Project EA (DOI-
BLM-NV-C010-2011-0516-EA) were signed in June 2010 and January 2012,
respectively. Combined, the two EAs analyzed and permitted up to 34 well pads
(with multiple wells on each pad), 205.6 acres of surface disturbance on BLM-
administered lands, and 4 acres of surface disturbance on the US Navys Lamb
Mineral Interests. Two groundwater wells were also approved.
Ormat acquired TGPs Dixie Hope leases in December 2010 and on February 1,
2012, those portions of the Dixie Meadows and Dixie Hope lease blocks that
remain of interest to Ormat were consolidated into the Combined Dixie
Meadows Geothermal Unit Area (NVN-89456X). Table 1 displays the leases
held and their legal land descriptions.
1-4 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
1. Introduction/Purpose and Need
Table 1
Leases Within the Combined Dixie Meadows Geothermal Unit Area (NVN-89456X)
Lease Number Section Number Township, Range
NVN-60686 17, 18, 19, 20 T22N, R35E
NVN-60685 9, 10, 15, 16 T22N, R35E
Lamb Mineral Interest 5, 8, 17, 18, 19 T22N, R35E
NVN-83934 1, 2, 3, 4, 8 T22N, R35E
NVN-83935 11, 12, 13, 14 T22N, R35E
NVN-83936 21, 22, 23, 24 T22N, R35E
NVN-83937 25, 26, 35, 36 T22N, R35E
NVN-83939 5, 6, 7, 8 T22N, R36E
NVN-83941 4, 17, 19, 20, 30, 31 T22N, R36E
NVN-86885 27, 29, 30 T22N, R35E
NVN-91823 3, 4, 18 T22N, R35E
NVN-92479 7, 8, 18 T22N, R35E
NVN-92717 18 T22N, R35E
Source: Ormat GIS 2016
Since the two FONSIs and Decision Records were issued, seven wells (three
full-size 42(12)-9, 23A-8, and 24-8 and four core holes; 22-8B, 23-8, 24A-8, and
86-7) have been drilled. The results of these wells indicate that geothermal
resources are more likely to exist near the western margin of the valley.
Consequently, Ormat obtained two additional geothermal lease areas (N-92479
and N-92717) on December 1, 2013 on the western side of the lease blocks,
which extend up to the boundary with the Stillwater Range Wilderness Study
Area (WSA) that is present west of the Dixie Valley road.
Table 2
Existing and Permitted Wells
Kettleman UTM
Well Type2 and Depth
Well Coordinates1 Well Status
(If Drilled)
Number Easting Northing
Lamb Mineral Interests
57-5 408429 4406136 Previously permitted, not drilled Deep core hole/full-size
well
58-5 408424 4405877 Previously permitted, not drilled Deep core hole/full-size
well
Lease Number N-60685 T22N; R35E
21-9 409586 4405668 Existing Monitoring well (MW-1);
472 feet
42(12)-9 409994 4405393 Existing Full-size well; 7,442 feet
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 1-5
1. Introduction/Purpose and Need
Table 2
Existing and Permitted Wells
Kettleman UTM
Well Type2 and Depth
Well Coordinates1 Well Status
(If Drilled)
Number Easting Northing
Lease Number N-60686 T22N; R35E
11-17 407646 4404163 Previously permitted, not drilled Deep core hole
Lease Number N-83934 T22N; R35E
75-4 410549 4406437 Existing (currently being drilled) Full-size well; at least 5,000
feet depth planned
71-3 412266 4407189 Previously permitted, not drilled Deep core hole/full-size
well
14-2 412714 4406660 Previously permitted, not drilled Deep core hole/full-size
well
25-3 411218 4406454 Previously permitted, not drilled Deep core hole/full-size
well
67-4 410306 4406077 Previously permitted, not drilled Deep core hole/full-size
well
Lease Number N-92479 T22N; R35E
84-7 407504 4405053 Previously permitted, not drilled Deep core hole
86-7 407326 4404615 Existing Core hole; 1,000 feet
86A-7 407332 4404610 Previously permitted, not drilled Full-size well
22-8b 407743 4405476 Existing Core hole; 1,000 feet
22-8a 407918 4405570 Previously permitted, not drilled Core hole; 1,000 feet depth
planned
22C-8 407886 4405488 Previously permitted, not drilled Full-size well
31-8 407955 4405593 Previously permitted, not drilled Core hole; 1,000 feet depth
planned
23-8 407925 4405330 Existing Deep core hole; 4,700 feet
23A-8 407890 4405291 Existing Full-size well; 4,758 feet
24-8 407734 4404988 Existing Full-size well; 3,060 feet
24A-8 407724 4404983 Existing Core hole; 750 feet
17-8 407578 4404429 Previously permitted, not drilled Full-size well
Source: Ormat GIS 2016
1
Coordinates are in NAD1983 UTM 11N (meters)
2
Well types are as follows:
Core holes are wells that are drilled using a hollow drill bit; whole rock samples (cores) can be extracted
from wells drilled this way
Deep core holes are cores drilled to a relatively greater depth
Full-size wells are drilled to a wider diameter than core holes, allowing for either production or injection
use, depending on observed well characteristics
Monitoring wells are wells used for monitoring various characteristics of water resources
1-6 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
1. Introduction/Purpose and Need
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 1-7
1. Introduction/Purpose and Need
The need for the Proposed Action is established by the BLMs responsibility
under the Geothermal Steam Act of 1970; the regulations under 43 Code of
Federal Regulations (CFR) 3270; the Minerals Leasing Act of 1920, as amended;
and Secretarial Order 3285 of March 11, 2009. In addition, states across the
western US have adopted renewable portfolio standards that require electricity
providers to obtain a certain percentage of power from renewable energy
resources. Nevadas renewable portfolio standard requires that the states
utilities procure 25 percent of their energy from renewable sources by 2025.
Californias renewable portfolio standard requires 33 percent by 2020.
The Dixie Meadows Geothermal Utilization Project would help to meet these
mid- and long-term regional needs.
The CRMP has been amended by the Nevada and Northeastern California
Greater Sage-Grouse Approved Resource Management Plan Amendment
(Approved Greater Sage-Grouse Plan Amendment; BLM 2015a;
http://bit.ly/1QFzXv7). The Record of Decision (ROD) and Approved Resource
Management Plan Amendments for the Great Basin Region (henceforth referred
to as the Decision; BLM 2015a), including the Greater Sage-Grouse Sub-Region
of Nevada and Northeastern California, were signed on September 21, 2015 by
the Director of the BLM and the Assistant Secretary of Land and Minerals
Management. This Decision, in conjunction with the approved resource
management plans and approved resource management plan amendments,
constitutes BLM land use planning decisions to conserve the greater sage-grouse
and its habitats throughout its remaining range that is located on public lands
administered by the BLM. The efforts of the BLM, in coordination with the
Forest Service on National Forest System lands within the remaining range of
the species, constitute a coordinated strategy for conserving the greater sage-
grouse and the sagebrush-steppe ecosystem on most federal lands on which the
1-8 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
1. Introduction/Purpose and Need
species depends. The Proposed Action has components that fall within areas
mapped as Other Habitat Management Areas (OHMA).
Appendix C of the Decision states that required design features (RDFs) are
required for certain activities in all greater sage-grouse habitat. RDFs establish
the minimum specifications for certain activities to help mitigate adverse
impacts. The RDFs are included as Appendix B of this EA (Greater Sage-
Grouse Required Design Features). Project components are in conformance
with the amended RMP through incorporation of the applicable RDFs (see
Appendix B) within greater sage-grouse OHMA. RDFs do not apply outside of
greater sage-grouse OHMA.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 1-9
1. Introduction/Purpose and Need
The EA has been prepared in accordance with the following statutes and
implementing regulations, policies, and procedures:
1-10 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
1. Introduction/Purpose and Need
The Proposed Action is consistent with State of Nevada, and Churchill and
Pershing County ordinances, policies, and plans.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 1-11
1. Introduction/Purpose and Need
Table 3
Potential Regulatory Permits and Approvals
Regulatory Agency Authorizing Action
BLM and US Navy Decision Record
BLM and US Navy Right-of-Way
BLM and US Navy US Navy Concurrence (if southern gen-tie route is
chosen)
BLM Geothermal Drilling Permit
BLM Permit to Construct Power Plant
BLM Geothermal Site License
BLM Geothermal Commercial Use Permit
Nevada Division of Minerals Permit to Drill an Oil and Gas and Geothermal Well
Nevada Public Utilities Commission Utility Environmental Protection Act Permit (if 230-kV
gen-tie line is selected)
Nevada Department of Environmental Construction Stormwater Permit and Underground
Protection Bureau of Water Pollution Injection Control (UIC) permit
Control
Nevada Division of Water Resources Temporary Consumptive Water Use permit
Nevada Bureau of Air Pollution Control Surface Area Disturbance Permit
BLM, Nevada Division of Historic Preservation Section 106 compliance with the National Historic
and Archaeology Preservation Act
Churchill County Special Use Permit
Pershing County Special Use Permit
1-12 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
CHAPTER 2
PROPOSED ACTION AND ALTERNATIVES
The Proposed Action and Alternative 1 presented below differ only in the
routing of the gen-tie line. Currently, the Proposed Action has lower
connection costs, but has other interconnection challenges. The gen-tie
proposed under Alternative 1 is shorter, but has greater costs due to the need
for a transformer at the interconnection site. From an economic and
transmission interconnection perspective, the northern gen-tie route as
described in the Proposed Action is the preferred alternative.
Figure 3, Project Overview, displays the well locations and footprint size of
potential power plants. To allow development flexibility, more sites are
proposed than would be used. Further, multiple wells may be drilled on a single
pad.
Because of its scale, the gen-tie route is displayed in Figure 4, Gen-Tie Route
Proposed Action.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-1
2. Proposed Action and Alternatives
2-2 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-3
2. Proposed Action and Alternatives
Table 4
Area of Disturbance (Proposed Action)
Amount of
Amount of
Amount of Disturbance that
Disturbance to Be
Disturbance Would Not Be
Disturbance Type Reclaimed
(Approximate Reclaimed
(Approximate
Acres) (Approximate
Acres)
Acres)
Production and injection wells 90 45 45
Exploration core holes and 10 5 5
water wells
Power plants and substation 64 32 32
Gen-tie 1,778 1,758 20
Access roads/pipelines 40 20 20
Total 1,982 1,860 122
Source: Ormat GIS 2016
To reduce the potential for impacts on birds and bats, a bird and bat
conservation strategy (BBCS) has been prepared (see Appendix C, Bird and
Bat Conservation Strategy).
Exploration Wells
The applicant has completed several exploratory wells under previously
approved EAs described in Section 1.2, Background, and shown in Figure 2.
2-4 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
This aspect of the project would follow the process outlined in Section 2.1.2,
Exploration Wells, and would be performed concurrently with similar
exploration activities approved in the 2011 Exploration EA. Drilling as permitted
under the Decision Records for the two previous exploration EAs is ongoing to
continue evaluating the geothermal resource in the area.
Gen-tie
Construction of the gen-tie line would take approximately 5 months to
complete. Construction would commence only after all required permits and
authorizations have been secured. Construction would comply with any timing
limitations or restrictions imposed for nesting of migratory birds or greater
sage-grouse.
Typically, these wells would be core holes which require a smaller drill pad than
a full-size production or injection well. Each exploration well would be situated
on an approximately 150- by 150-foot drill pad (approximately 0.5 acres) and be
drilled using the materials and processes described in the Exploration EA.
Drilling an exploration well typically occurs over a period of 4 to 10 weeks,
depending on depth, diameter, and resource conditions.
Site Preparation
Drill pad preparation activities would include clearing, earthwork, drainage, and
executing any other improvements necessary for efficient and safe operation
and fire prevention. Only those drill pads scheduled to be drilled would be
cleared. Clearing would include removal of organic material, and vegetation.
Topsoil would be salvaged during the construction of all pads and new access
roads, as feasible, and stockpiled on the pads for use during subsequent
reclamation of the disturbed areas. Stockpiled topsoil would be seeded with a
BLM-approved seed mix to ultimately increase reclamation success.
Construction of a drill pad takes approximately 1 to 2 weeks to complete.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-5
2. Proposed Action and Alternatives
Gravel for drill pad and road building material would be obtained through
Ormats mineral material sales contract with the BLM. The gravel pit is located
in T22N, R35E, Section 7, SE1/4 NE1/4 and Section 8 SW1/4 NW1/4, Mount
Diablo Base and Meridian. This sales contract (N-89405) expired on July 8,
2016, but ORNI 32 is currently in the process of renewing it.
Each drill site, exclusive of the reserve pit, would be covered with
approximately 4 inches of gravel. An average of about 6 inches of gravel would
be applied to the new access roads, as necessary, to create an all-weather, all-
season surface.
Drilling
Each exploration core well would be drilled with a rotary drill rig. During
drilling, the top of the drill rig mast could be as high as 50 feet above the ground
surface. The typical associated support equipment would include drill pipe,
trailers, drill mud, fuel and water tanks, diesel generators and air compressors.
Additional equipment and supplies would be brought to the drill site during
ongoing drilling and testing operations.
The wells would each be drilled and cased to a design depth selected by the
project geologist. Blowout prevention equipment, which is typically inspected
and approved by the BLM and the Nevada Division of Minerals (NDOM), would
be utilized while drilling below the surface casing. During drilling operations,
cool water, salt, or barite (barium sulfate) would be stored at each well site for
use in preventing uncontrolled well flow (killing the well), as necessary. If
water for this purpose is stored in pits, pits would be fenced to prevent wildlife
access.
The well bore would be drilled using nontoxic, temperature-stable drilling mud
composed of a bentonite clay-water or polymer-water mix. Variable
concentrations of standard, approved drilling additives would be added to the
drilling mud as needed to prevent corrosion, increase mud weight, and prevent
mud loss. Additional drilling mud would be mixed and added to the mud system
as needed to maintain the required quantities.
Site Decommission
Following completion of exploration well testing, all drilling and testing
equipment would be removed from the site, and interim reclamation would
2-6 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
occur on areas of the well pad not needed for future well monitoring or testing.
Interim reclamation would follow interim reclamation standards outlined in
Appendix D, Best Management Practices Mitigation Measures, of the BLMs
2008 geothermal leasing Programmatic Environmental Impact Statement (PEIS;
see Appendix F, PEIS for Geothermal Resources Leasing in the Western
United States, Appendix D: Best Management Practices and Mitigation
Measures). Interim reclamation plans would be developed by ORNI 32 prior to
construction. The surface facilities remaining on the site would likely consist
only of several valves on top of the surface casing, which would be chained and
locked to allow access in case additional testing is desired.
After the well drilling and testing operations are completed, the reserve pits
would remain fenced with wildlife-proof fencing materials until all liquids are
evaporated. The solid contents remaining in each of the reserve pits, typically
consisting of nonhazardous, nontoxic drilling mud and rock cuttings, would be
tested after all liquids have evaporated for pH, metals, and total petroleum
hydrocarbon or oil and grease concentrations to confirm that they are not
hazardous. If the test results indicate that these solids are nonhazardous, the
solids would then be dried, mixed with the excavated rock and soil, and buried
by backfilling the reserve pit. If any hazardous materials were identified, they
would be removed and properly disposed offsite in accordance with all
applicable local, state, and federal laws.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-7
2. Proposed Action and Alternatives
on Figure 3 and other figures in this EA are shown to display the scale of each
power plant site and the range of candidate plant locations. At either location,
an approximately 0.7-acre substation, used to transform generated low voltage
electrical energy to the higher voltage required for a transmission line, would be
constructed within the power plant boundary.
The most prominent features of the power plant, both in height and mass,
would be the air-cooled condensers. They range up to 35 feet in height and are
about two thirds the length of the site. The balance of the plant would be an
array of pipes, the turbine/generator, and a small building to house electrical
equipment. A gated, chain link fence would be installed around the perimeter of
each facility in order to prevent unwarranted access to the facility/electrical
generation areas by the public and/or wildlife.
All buildings housing the offices, electrical room, control room and auxiliary
buildings would be rigid, steel-frame, pre-engineered structures with steel panel
walls and a steel roof. The exterior of the buildings would be painted consistent
with the BLMs visual color guidelines to blend in with the surrounding area.
An existing mineral material sale contract (NVN-92900) is in the lease area. The
proposed plants would be located to not conflict with the mineral material sale
contract.
2-8 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
Upon BLM approval, initial site preparation would commence with grubbing and
clearing of the utilization area. Following grubbing and clearing, topsoil would be
removed and stockpiled for later use in revegetation and reclamation.
Stockpiled topsoil would be seeded with a BLM-approved seed mix to ultimately
increase the potential for reclamation success. Since the topography of all site
options is relatively flat, it is anticipated that minimal cutting of slopes would be
required. If material generated from cutting slopes does not provide the
required amount of fill material, fill could be obtained from the BLM gravel pit
described in Section 2.1.2.
Any fill slopes constructed would be 2:1 or flatter as necessary and would be
compacted and maintained to minimize erosion and provide slope stability. The
proposed power plant equipment and structures would be situated on
conventional spread footings, except the area beneath the turbine and
generator, which may require additional support from pilings. Further
geotechnical studies would determine what type of foundation may be required
beneath these units.
During construction, a portion of the power plant sites and adjacent well pads
would be devoted to equipment and materials laydown, storage, construction
equipment parking, small fabrication areas, office trailers and parking. Equipment
and materials laydown space is required for large turbine parts, structural steel,
piping spools, electrical components, switchyard apparatus, and building parts.
Most access roads would be constructed during the exploration activities. The
power plants and associated structures would be situated if possible along these
access roads, which would limit new access road construction. All access roads,
laydown areas, and parking areas would be provided with a gravel surface after
grading, which would inhibit sediment runoff from the surface.
Temporary utilities would be provided for the construction offices, the laydown
area, and the power plant site. Temporary construction energy would be
supplied by a temporary generator and, if available when the transmission line is
completed, at the site by utility-furnished power. Area lighting, drinking water,
and portable toilets and sanitations would be implemented. Use of nighttime
lighting during construction would be minimized to the extent possible to
comply with Dark Sky Initiative lighting practices and to reduce impacts on the
US Navys Night Vision Device aircraft operations. During construction, ORNI
32 would maintain adequate obstruction lighting to any construction equipment
that project above 40 feet.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-9
2. Proposed Action and Alternatives
The vaporized binary fluid exits the turbine and is condensed back into a liquid
in a non-contact, air-cooled condenser. The condensed binary fluid is then
pumped back to the heat exchangers for reheating and vaporization, completing
the closed-loop cycle.
After exiting the heat exchangers, the cooled geothermal fluid is pumped to the
geothermal injection wells through the injection pipelines, and injected back into
the geothermal reservoir.
Based upon data from other Ormat facilities, the total geothermal fluid
production rate for each Dixie-Meadows facility would be up to about 6.4
million pounds per hour per plant (14,000 gallons per minute [gpm] per plant) at
an average temperature of 300F. Production well flow rates are expected to
range from approximately 2,000 to 3,000 gpm per well, based on five or six
production wells. The total estimated geothermal production rate could
increase or decrease. This would depend on the number of production wells
that are installed and the observed geothermal fluid temperature and
production rate at each well.
All the geothermal fluid brought to the power plants would be injected back
into the geothermal reservoir. The injection pressure, and the volume injected
per well, would depend on the permeability of each wells injection zone. The
total estimated injection rate into the injection wells would be similar to the
production rate, but slightly lower volume due to fluid contraction due to
cooler temperatures (typical minimum temperature of 150 to 170F). Injection
rates would depend on the final number of injection wells installed, as well as
the permeability of each wells injection zone.
Lighting used during operation of the power plant and all ancillary facilities
would be minimized, motion controlled to the extent possible, and downward
facing to minimize impacts on the US Navys Night Vision Device aircraft
operations.
2-10 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
Substation Construction
Each power plant would include an electrical substation at which electrical power
generated at 12.47-kV would pass through a transformer to increase the voltage
to 120-kV. Each substation would include a 12.47-kV circuit breaker to protect
the electric generators, potential and current transformers for metering and
system protection, and a circuit breaker to protect the substation. A main control
building would contain instrumentation and telecommunications equipment.
The substations would measure up to 200 feet by 150 feet each and would be
surrounded by an 8-foot-tall chain link fence with vehicle and personnel access
gates. The surface of the substations would be covered by gravel and the
substation equipment would be placed onto concrete foundations.
Work at the substation sites would begin by clearing existing vegetation and
grading a level pad for installation of the substation. Once the pad is prepared,
the site would be secured with chain link fencing. Once the equipment is
installed, pit run gravel would be spread over the site to a depth of
approximately 4 inches. Gravel for each plants transformer site would be
obtained through Ormats existing mineral material sales contract with the BLM,
as described in Section 2.1.2, under Site Preparation.
Substation Operation
Once the substation and associated facilities are operational and in-service,
operations and maintenance personnel would maintain the proposed
transmission system by monitoring, testing, and repairing equipment.
Site Decommission
At the end of project operations all aboveground facilities and areas of surface
disturbance associated with geothermal development would be removed and
reclaimed. Ultimately, ORNI 32 would implement a site reclamation plan in
conformance with reclamation standards outlined in Appendix D, Best
Management Practices Mitigation Measures, of the BLMs 2008 geothermal
leasing PEIS (see Appendix F). A reclamation plan would be developed by
ORNI 32 prior to construction. The plan would address restoring the surface
grades, surface drainage, and revegetation of cleared areas. Stormwater
diversion would remain in place until successful revegetation is attained.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-11
2. Proposed Action and Alternatives
The proposed well sites and selected attributes are listed in Table 5, Proposed
Wells. The coordinates provided in this table are estimates of the actual
location; wells may be sited in a slightly different location, but would remain
within the same Kettleman number as shown in the table.
Drill sites would be prepared to create a level pad for the drill rig and a graded
surface for the support equipment. Fenced reserve pits, or sumps, would be
constructed as described in Section 2.1.2, under Site Preparation.
2-12 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
Table 5
Proposed Wells
Kettleman Well UTM Coordinates1
Well Type2
Number Easting Northing
Lamb Mineral Interests
52-19 406702 4402543 Deep core hole/full-size well
Lease Number N-60686 T22N; R35E
83-18 407420 4403693 Deep core hole/full-size well
24-17 407705 4403526 Deep core hole/full-size well
75-18 407147 4403323 Deep core hole/full-size well
Lease Number N-83934 T22N; R35E
28-8 407917 4404359 Deep core hole/full-size well
36-8 407966 4404738 Deep core hole/full-size well
Lease Number N-92479 T22N; R35E
43-8 408226 4405326 Deep core hole/full-size well
41-8 408196 4405642 Deep core hole/full-size well
32-8 408003 4405533 Deep core hole/full-size well
34-8 408034 4405058 Deep core hole/full-size well
33-8 407981 4405302 Deep core hole/full-size well
13-8 407584 4405232 Deep core hole/full-size well
16-8 407538 4404672 Deep core hole/full-size well
48-7 406589 4404328 Deep core hole/full-size well
15-8 407678 4404853 Deep core hole/full-size well
72-18 407164 4403909 Deep core hole/full-size well
52-18 406677 4403931 Deep core hole/full-size well
Lease Number N-92717 T22N; R35E
64-18 406869 4403491 Deep core hole/full-size well
Source: Ormat GIS 2016
1
Coordinates are in NAD1983 UTM 11N (meters)
2
Well types are as follows:
Core holes are wells that are drilled using a hollow drill bit; whole rock samples (cores) can be extracted
from wells drilled this way
Deep core holes are cores drilled to a relatively greater depth
Full-size wells are drilled to a wider diameter than core holes, allowing for either production or injection
use, depending on observed well characteristics
Monitoring wells are wells used for monitoring various characteristics of water resources
Each well would be drilled with a large rotary drill rig. During drilling, the top of
the drill rig mast could be as much as 170 feet above the ground surface. The
typical drill rig and associated support equipment, including trailers,
compressors, drill pipe, mud systems and other large equipment, would be
brought to the prepared pad on 25 or more, large tractor-trailer trucks.
Additional equipment and supplies would be brought to the drill site during
ongoing drilling and testing operations. During drilling, ORNI 32 would maintain
adequate obstruction lighting on any construction equipment or drilling rigs that
project above 40 feet. ORNI 32 would notify NAS Fallon before setting up the
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-13
2. Proposed Action and Alternatives
drill rig. This is to ensure that lighting is compatible with the US Navys Night
Vision Device aircraft operations and to avoid potential conflicts with low-flying
aircraft.
Drilling would be conducted 24-hours per day, 7-days per week by a crew of
nine to ten workers. During short periods, the number of workers on site
during drilling could be as high as 18. Drilling at each full-size well would be
expected to last approximately 1 to 2 months on average.
Water required for well drilling could range up to 75 gpm. Water necessary for
these activities would likely be obtained from shallow water wells drilled from
one or more of the proposed drill sites as approved by the BLM and under a
waiver for the temporary use of groundwater from the Nevada Division of
Water Resources (NDWR). Other private wells in the valley could also supply
the water.
Well Drilling
The wells would each be drilled and cased to a design depth selected by the
project geologist. Blowout prevention equipment, which is typically inspected
and approved by the BLM and NDOM, would be utilized while drilling below the
surface casing. During drilling operations, cool water, salt, or barite would be
stored at each well site for use in preventing uncontrolled well flow (killing the
well), as necessary.
The well bore would be drilled using nontoxic, temperature-stable drilling mud
composed of a bentonite-water or polymer-water mix for all wells. Variable
concentrations of approved drilling additives would be added as needed to
prevent corrosion, increase mud weight, and prevent mud loss. Additional
drilling mud would be mixed and added to the mud system as needed to
maintain the required quantities. Fenced reserve pits on each pad would contain
water, drill cuttings, and waste drilling mud during drilling operations.
2-14 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
In the event that very low pressure areas are encountered, compressed air may
be added to the drilling mud, or used instead of drilling mud, to reduce the
weight of the drilling fluids in the hole and assist in carrying the cuttings to the
surface. Additionally, each well may need to be worked over or redrilled if
mechanical or other problems are encountered while drilling or setting casing
that prevent proper completion of the well in the targeted geothermal
reservoir, or if the well does not exhibit the anticipated permeability,
productivity or injectivity. Depending on the circumstances encountered,
working over a well may consist of lifting the fluid in the well column with air or
gas, or stimulation of the formation using dilute acid or rock fracturing
techniques. Well redrilling may consist of reentering and redrilling the existing
well bore; reentering the existing well bore and drilling and casing a new well
bore; or sliding the rig over a few feet on the same well pad and drilling a new
well bore through a new conductor casing.
Flow Testing
Following well construction, and while the drill rig is still over the well, the
residual drilling mud and cuttings would be flowed from the well bore and
discharged to the reserve pit. This may be followed by one or more short-term
flow tests. Each test would consist of flowing fluid from the well while
monitoring geothermal fluid temperatures, pressures, flow rates, chemistry and
other parameters. An injectivity test may also be conducted by injecting the
produced geothermal fluid into the well and the geothermal reservoir. The drill
rig would likely be moved from the well site following completion of these
short-term tests.
Long-term flow tests (five days or more) of each well drilled could be
conducted following the short-term flow tests to more accurately determine
long-term well and geothermal reservoir productivity. Two or more wells could
be used during these tests.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-15
2. Proposed Action and Alternatives
Pipeline Construction
The construction of the aboveground pipelines would require grading of the
pipeline corridor. Pipeline construction would begin with auguring holes for pipe
supports, which would be pre-fabricated off site and set into concrete. While
the concrete is curing, the approximately 40-foot long steel pipe sections would
be delivered and placed along the construction corridor. A small crane would
lift the pipe sections onto the pipe supports and temporary pipe jacks so that
they could be welded together into a solid pipeline. Once welded and the welds
tested, the pipe would be jacketed with insulation and an aluminum sheath
(appropriately colored, as determined by BLM, to blend with the area).
At access road crossings, the pipeline would be buried in a trench using a pipe
sleeve. Horizontal, or vertical expansion loops would locally be constructed.
When completed, the top of the new geothermal pipelines would average three
feet (and up to six feet) above the ground surface. Electrical power and
instrumentation cables for the wells would then either be installed in steel
conduit constructed along the same pipe sleepers or hung by cable from pipe
along the pipeline route.
Water Requirements
During construction of the power plants and pipelines, ORNI 32 would need
water for dust control, soil compaction, and miscellaneous uses. An estimated
total of 17.6 acre-feet would be used throughout a 1-year construction period.
ORNI 32 does not have water rights.
Water required for construction would likely be obtained from up to two water
wells that would be constructed on BLM land north of the plants, at a site to be
determined after approval by the BLM. Both Ormat and TGP were previously
permitted the installation of temporary non-potable water wells for drilling and
construction water, but the wells were never constructed. ORNI 32 would
obtain a waiver from the Nevada State Water Engineer (NDWR) to install and
use the wells. Each water well would be situated on a pad approximately 150
feet by 150 feet in size (approximately 0.5 acres) and be drilled using the
materials and processes described in the Exploration EA.
2-16 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
Following construction, facility water needs would include water for the fire
pump system, general maintenance water, and water for the domestic water
system, and would be approximately 2.5-3.0 acre-feet per year throughout the
life of the project. A well may be completed at one or both plant sites that
would only be used for the domestic purposes. Based on test results from the
sites existing monitoring well, area groundwater is expected to be non-potable
water, with high levels of dissolved solids. The domestic water would undergo
basic treatment with chlorination to prevent bacterial growth, but it would not
be treated to meet drinking water quality standards. Drinking water for on-site
personnel would be provided from bottled water.
Portable toilets would be provided throughout the site during construction, but
a septic system would be installed at the main office building.
The number of miles of new access roads constructed would depend on well
pad configuration, but total surface disturbance would not exceed 20 acres.
Road beds would be constructed using a dozer and/or road grader. An average
of 6 inches of gravel would be put on the road beds.
Surface Reclamation
Once drilling is complete, the shoulders of the pads could be reclaimed, but the
majority of the pad must be kept clear for ongoing operations and the potential
need to work on or re-drill the well. The portions of the cleared well sites not
needed for operational and safety purposes would be recontoured to a final or
intermediate contour that would blend with the surrounding topography as
much as possible. Areas to be reclaimed would be ripped, tilled, or disked on
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-17
2. Proposed Action and Alternatives
At the end of Project operations, the wells would be plugged and abandoned in
compliance with BLM and NDOM regulations. Abandonment typically involves
filling the well bore with heavy abandonment mud and cement until the top of
the cement is at ground level, which is designed to ensure that fluids would not
move across geologic barriers into different aquifers. The well head and any
other equipment would then be removed, the casing cut off below the ground
surface, and the hole backfilled to the surface.
Pipeline reclamation would include pipeline removal and cutting off support
posts flush with the ground surface.
2.1.5 Gen-Tie
This alternative includes the construction and operation of an overhead 120-kV
gen-tie and associated facilities that would be routed northeasterly to Ormats
Jersey Valley power plant.
Route Description
The 120-kV gen-tie would extend about 48.1 miles in a northeasterly direction
from the proposed Dixie Meadows Geothermal power plants to Ormats
existing Jersey Valley Geothermal Power Plant (see Figure 4).
2-18 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
Just south of the Terra-Gen power plant, the Dixie Meadows line would
completely diverge from the Terra-Gen line and continue another 31 miles in an
east or northeasterly direction until it reaches the Jersey Valley geothermal
power plant. This segment would largely parallel existing gravel roads.
From the Jersey Valley facility, power would be transmitted along the existing
Jersey Valley power line to the NV Energy regional power line located at
Bannock.
Depending on the exact location of the proposed Dixie Meadows power plants,
the entire gen-tie route would be located on BLM-administered land and
potentially a portion of US Navy lands. No private property would be affected.
Components
The gen-tie would consist of a single 120-kV circuit using 397.5 MCM aluminum
conductor steel-reinforced (ACSR) Ibis and optical ground wire. Overhead
conductors would be non-specular to reduce sunlight reflection and minimize
impacts on visual resources. The gen-tie would use direct-burial, self-supporting
wooden monopole structures. Structure heights would be 55 to 70 feet with a
span between 300 and 450 feet, depending on the terrain. Poles would include
tangent, angle and dead-end types. The diameter at the base of the structure
would range from 2 to 3 feet. Structure sites would include assembly and crane-
landing areas.
Each structure would carry a single overhead ground wire/fiber optic cable for
lightning protection and fiber optic communications. The overhead ground wire
measures approximately 0.75 inches in diameter and is constructed of
concentric layers of galvanized steel wires surrounding a hollow core which
contains 12 to 48 fiber optic strands (depending on final requirements).
Metering and communications equipment would be present at each generator
site.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-19
2. Proposed Action and Alternatives
The initial activity prior to construction would be the engineering survey and
staking of project facilities. This would include marking structure locations,
anchor sites, staging and material yards, wire setup sites, and the substation and
switching station location. The site would be staked, and preconstruction plant
and wildlife surveys would occur to delineate any sensitive resource areas.
Existing roads would be utilized whenever possible to access the ROW. In areas
where no reasonable access roads exist, ORNI 32 would utilize overland travel
to access the ROW. If overland travel is required in riparian or wetland areas,
every effort would be made to limit overland travel to the late fall or early
winter. This is when most plant and wildlife species are dormant and water
levels are low.
In order to stage equipment and conduct work, the structure work areas and
stringing sites would require a relatively flat surface. Therefore, the areas could
be graded, and gravel or soil could be imported to achieve the necessary
elevation. Any gravel would be obtained through a mineral material sales
contract with the BLM, as described in Section 2.1.2, under Site Preparation.
At each structure site, work areas would be required to facilitate the safe
operation of equipment and construction operations. Construction laydown
areas would be located in previously disturbed areas whenever possible (i.e.,
along access roads or on well pads) and would not be in wetland or riparian
areas. At each location, a work area would be cleared and leveled, if necessary.
In relatively flat terrain, this would not be needed. Structure pieces would be
delivered to the laydown area where workers would assemble the pole and
attach insulators and hardware. The pole would be erected using a crane from
the staging area. After construction, the laydown area would be reclaimed and
restored with the exception of a 20-foot by 30-foot pad on both sides of the
gen-tie, which would be used for future maintenance of the structure as
necessary.
2-20 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
for vehicles, and storage spaces for equipment and materials. Structural
materials such as structure steel, hardware, foundation material, spools of
conductor, and shield wire, would be hauled by truck into the yard. A crane or
forklift would be required to unload and transport the materials. Construction
materials would be delivered by truck from the yard to the lay down areas.
From these areas, materials would be brought to structure sites as needed.
Crews would load the material required for the workday, thus limiting the
weight hauled on the access roads. This would limit the impact and rutting on
access roads caused by heavy vehicles.
Materials, such as gen-tie poles, insulators, hardware, and guy wire anchors,
would be delivered from the laydown area to each gen-tie structure site.
Assembly crews would attach insulators, travelers, and hardware to form a
complete structural unit. The wooden monopole structures would require a
temporary workspace of up to 300 feet by 300 feet and a 30-foot by 40-foot
area for line construction equipment. Erection crews would use a large, truck-
mounted mobile crane to place the structures directly into the ground,
depending on the soil conditions and results of geotechnical surveys. The poles
directly embedded in the ground would be set in holes that are approximately 3
feet wide and 10 feet deep. These holes would be backfilled with native or
imported materials. Guy wires to support the angle poles would be used to
keep the structures vertical. As a safety precaution, guy wires would be made
more visible if they cross over designated access roads. Signs, flagging, or other
markings would be used to indicate the presence of guy wires. Upon
construction completion, disturbed portions of the 210-foot-wide short-term
ROW would be revegetated with a BLM-approved, weed-free seed mix.
Conductor and shield wire would be delivered on reels by flatbed truck to the
various conductor pulling sites along the ROW. Other equipment required to
install the conductor would include reel stringing trailers, tensioning machines,
pullers, and several trucks including a bucket truck.
The conventional method for installing conductor and shield wire is to pull out a
sock line or pullrope along the route of the line and manually lift the rope into
stringing sheaves. The rope is brought to a puller at one end and a tensioner on
the other end. The tensioner holds the wire reels and maintains enough tension
to keep the wire off the ground and vegetation while the puller pulls the wire
through the stringing sleeves. This method may require some overland travel
between structures. When overland travel is required for this purpose, an all-
terrain vehicle or similar type vehicle would be used. If overland travel is
required in riparian or wetland areas, every effort would be made to limit it to
the late fall or early winter. This is when most plant and wildlife species are
dormant and water levels are low.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-21
2. Proposed Action and Alternatives
Splicing would occur between conductor spools. After the conductors are
pulled in, conductor tension would be adjusted to properly sag the conductors.
The conductors would then be clipped to the insulators and the stringing roller
wheels removed.
Sites for tensioning equipment and pulling equipment are typically approximately
300 feet by 300 feet in size. Typically, conductor pulling sites for stringing the
conductor would be spaced at 15,000 to 20,000 foot intervals. However,
distances between each site would vary depending on the geography,
topography, and environmental sensitivity of the specific area; the length of the
conductor pull; and, equipment accessibility. Pulling sites would require a
temporary working area. At each pulling site, stringing equipment would be set
up approximately 250 feet from the initial structure for leveraging the
conductor pull safely. At angle structure pulling sites, the stringing equipment
must also be 250 feet from the poles, or up to 100 feet outside of the 300-foot
temporary ROW boundary (assuming the power line is centered within the
ROW). However, the stringing equipment would be present within the 500-
foot-wide zone centered on the ROW alignment that has been surveyed for
biological and cultural resources. These sites would not be in riparian or
wetland areas.
Waste materials and debris from construction areas would be collected, hauled
away, and disposed of at approved landfill sites. A covered portable dumpster
would be kept on site to contain trash.
2-22 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-23
2. Proposed Action and Alternatives
2-24 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-25
2. Proposed Action and Alternatives
2-26 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
1. Any small fires which occur at the power plant facilities or around
the well pad during drilling and/or testing operations should be able
to be controlled by rig personnel utilizing on-site firefighting
equipment.
2. Vegetation is extremely sparse in the Project Area, so wildland fires
are unlikely. However, the BLM CCD ([775]-885-6000) would be
notified of any wildland fire, even if the available personnel can
handle the situation or the fire poses no threat to the surrounding
area. Additionally, the Sierra Front Interagency Dispatch Center
would be notified at (775) 883-5995.
3. A roster of emergency phone numbers would be available onsite so
that the appropriate firefighting agency can be contacted in case of a
fire.
4. Construction vehicles shall carry at a minimum a shovel and five
gallons of water (preferably in a backpack pump), in addition to a
conventional fire extinguisher.
5. Adequate firefighting equipment (a shovel, a pulaski, standard fire
extinguishers, and an ample water supply) shall be kept readily
available at each active drill site.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-27
2. Proposed Action and Alternatives
6. Vehicle catalytic converters (on vehicles that would enter and leave
the drill site on a regular basis) shall be inspected often and cleaned
of all flammable debris.
7. All cutting/welding torch use, electric-arc welding, and grinding
operations shall be conducted in an area free, or mostly free, from
vegetation. An ample water supply and shovel shall be on hand to
extinguish any fires created from sparks. At least one person in
addition to the cutter/welder/grinder shall be at the work site to
promptly detect fires created by sparks.
8. Personnel would be responsible for being aware of and complying
with the requirements of any fire restrictions or closures issued by
the BLM CCD, as publicized in the local media or posted at various
sites throughout the field office district.
Water Resources
There is a series of small springs, seeps, and marshy areas that are mostly in a
north-south alignment, to the east of the proposed development area. The
springs are cooler to the south and hotter to the north, where the Dixie Hot
Springs are located (SW, SE of Section 5, T22N, R35E).
The Geothermal Programmatic EIS (BLM 2008c) stipulates that any leases
containing thermal features (e.g., springs or surface expressions) require
monitoring of the thermal features during any exploration, development, and
production of the lease to ensure that there are no impacts on water quality or
quantity. Conformance with this requirement would be ensured by following
water resources monitoring outlined in this section.
The Dixie Meadows Water Resources Monitoring Plan (Ormat 2011) prepared
for exploration activities is a dynamic document that is updated as new
information and understanding of the geothermal resources in the geothermal
unit area improve. Ormat would continue to develop and revise the water
2-28 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
Final monitoring well and spring locations would be made in consultation with
the BLM. ORNI 32 would also work to gain access to US Navy lands for
hydrological monitoring.
Collected data would be reported to the BLM in written form by the unit
operator annually within 30 days of the end of each calendar year, together with
an interpretation of the monitoring data collected during the preceding calendar
year.
1
NDEP UIC Sample List 2 Internet website: http://ndep.nv.gov/bwpc/docs/uicform_nv_uic_samplelist2.pdf.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-29
2. Proposed Action and Alternatives
As additional wells are drilled and new geologic and hydrologic information is
collected, the hydrogeologic model for the geothermal system would be
updated and revised as necessary. ORNI 32 would update the aquatic resources
monitoring and mitigation plan as necessary, and in coordination with the BLM,
to show new information and well locations.
2-30 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
effects. As noted above, the plan would be closely coordinated by ORNI 32 and
the BLM, and it would be implemented before the project begins.
The extent of wetlands, riparian vegetation, and playas in the Project Area
would be mapped during plan development. This would be done to provide
baseline conditions against which future monitoring results would be compared.
The plan would also provide detailed measures to avoid or reduce construction-
related impacts on wetlands and riparian areas. Measures may include siting
project components outside wetlands and riparian areas, using existing roads or
disturbed areas to construct project components in or near wetlands and
riparian areas, restricting access seasonally during periods of saturated soils or
during the growing season, minimizing vegetation removal, and reclaiming areas
of temporarily disturbed vegetation.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-31
2. Proposed Action and Alternatives
Monitoring would include gathering surface water quality, flow, and temperature
data at two seasonal ponds in T22N, R35E, Section 9. Surface water monitoring
would be suspended when the ponds are dry, which typically occurs during the
summer. The ponds are habitat for, and known to be occupied by, the Dixie
Valley toad.
The plan would also provide detailed measures to avoid or reduce construction-
related impacts. Measures may include such measures as implementing
preconstruction surveys, installing exclusion fencing, biological monitoring
during construction, siting project components outside of wetlands and riparian
areas, using existing roads or disturbed areas to construct project components
in or near wetlands and riparian areas, minimizing vegetation removal, and
reclaiming areas of temporarily disturbed vegetation.
Table 6
Geothermal Lease Stipulation Summary
Endangered Cultural Riparian Riparian Native
Lease
Species Act Resource Areas (650- Areas (500- American
Number
Consultation Protection foot buffer) foot buffer) Consultation
NVN-83934 X X X X
NVN-83935 X X X X
NVN-83936 X X X X
NVN-83937 X X X X
NVN-83939 X X X X
NVN-83941 X X X X
NVN-83942 X X X X
2-32 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
Table 6
Geothermal Lease Stipulation Summary
Endangered Cultural Riparian Riparian Native
Lease
Species Act Resource Areas (650- Areas (500- American
Number
Consultation Protection foot buffer) foot buffer) Consultation
NVN-86885 X X X X
NVN-91823 X X X
NVN-92479 X X X
NVN-92717 X X X X
Source: Full lease stipulations in Appendix A
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-33
2. Proposed Action and Alternatives
Approximately 26.7 miles of this line would be located within an area that has
been segregated from all forms of appropriation under the public land laws,
including the mining laws, mineral leasing laws, and geothermal leasing laws,
subject to valid existing rights. The BLM has segregated this area in response to
an application received from the DON for a withdrawal expansion for military
use of the Naval Air Station Fallon, Fallon Range Training Complex in Churchill
County, Nevada. The segregation is in effect for a period of 2 years from
September 2, 2016, unless the application/proposal is cancelled or approved
prior to that date.
Two gen-tie alignments adjacent to the Oxbow line are possible. Both alignment
options are located on BLM-administered land and US Navy lands. No private
property would be affected. For either alignment, a switching station would be
required at the terminus site to connect the gen-tie to the NV Energy line.
Depending on the gen-tie alignment, this substation would be located on US
Navy lands on either the west side or east side of the Dixie Valley highway. The
switching station and access roads would be 8 to 10 acres in size.
The preferred gen-tie alignment option would run adjacent to the east side of
the Oxbow line from the proposed Dixie Valley power plants for about 11
miles, and would then cross under the Oxbow line. For the remainder of its
length, the alignment would follow the west side of the Oxbow line. The
advantage of this route is easier access to its potential terminus switching
2-34 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-35
2. Proposed Action and Alternatives
station site, which would be on the west side of the Dixie Valley Road, north of
the NV Energy line. The switching station site would have easy access along an
existing gravel road.
The other alignment would run along the east side of the Oxbow Line for its
entirety. No crossings of the Oxbow Line would be necessary except at the
proposed Dixie Meadows power plant[s]. The terminus switching station site of
this east-side route would be located east of the Oxbow line, north of the NV
Energy line. The site would be in a less-accessible area east of the Dixie Valley
Road and the Dixie Valley Wash. This site has steeper slopes and a dry wash
that bisects the site. A potentially expensive road with large culverts and/or a
bridge crossing the Dixie Valley wash would be required.
Once the equipment is installed, pit run gravel, 2 inches wide or less, would be
spread over the site to a depth of approximately 4 inches. Gravel would be
obtained through a mineral material sales contract with the BLM.
2.2.2 Components
The line voltage would be 230-kV, and a single transformer at the power plant
would be used to step voltage up to 230-kV.
2-36 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
2. Proposed Action and Alternatives
Table 7
Area of Disturbance (Alternative 1)
Amount of
Amount of
Amount of Disturbance that
Disturbance to Be
Disturbance Would Not Be
Disturbance Type Reclaimed
(Approximate Reclaimed
(Approximate
Acres) (Approximate
Acres)
Acres)
Production and injection wells 90 45 45
Exploration core holes and water 10 5 5
wells
Power plants and substation 64 32 32
Gen-Tie and switching station 1,150 1,140 10
Access roads/pipelines 40 20 20
Total 1,354 1,242 112
Source: Ormat GIS 2016
The existing Terra-Gen 230-kV transmission line cannot be used because there
may not be adequate capacity to accommodate the proposed Dixie Meadows
project and the lines private owner has informed ORNI 32 that they are
reserving any available capacity for their own future use. Thus, the gen-tie route
selection was predicated upon the gen-tie line interconnecting to one of the
two nearest available transmission lines with available capacity.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 2-37
2. Proposed Action and Alternatives
2-38 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
CHAPTER 3
AFFECTED ENVIRONMENT AND
ENVIRONMENTAL CONSEQUENCES
3.1 SCOPING AND ISSUE IDENTIFICATION
This section identifies and describes the current condition and trend of
elements or resources in the human environment which may be affected by the
Proposed Action or alternatives and the environmental consequences or effects
of the actions.
The BLM CCD, Stillwater Field Office held an interdisciplinary team meeting on
June 22, 2015. The following issues were identified as needing to be addressed
in the environmental assessment: migratory birds, wildlife and key habitat, BLM
sensitive species, wetlands and riparian areas, invasive/nonnative species, visual
resources, cultural resources, Native American religious concerns, travel
management, land use authorizations, hazardous or solid waste, and
socioeconomics. Subsequent coordination with the interdisciplinary team
identified air quality, water resources, soil resources, public health and safety,
and wilderness study areas as needing to be addressed in detail. Public health
and safety was combined with hazardous or solid waste, because similar issues
were addressed in both.
The following issues were identified as not being present or affected in the
proposed Project Area: areas of critical environmental concern; environmental
justice; farm lands; forests and rangelands; threatened and endangered species;
wild and scenic rivers; paleontological resources; lands with wilderness
characteristics; recreation; and wild horses and burros. The supporting rationale
for these determinations is provided in the table below.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-1
3. Affected Environment and Environmental Consequences
Table 8
Supplemental Authorities and Rationale for Detailed Analysis for the Proposed Action
Present/ Present/
Not
Elementsa Not May Be Rationale
Presentb
Affectedb Affectedc
Air Quality X Carried forward in Section 3.2.
Areas of Critical X Not present.
Environmental
Concern
Cultural Resources X Carried forward in Section 3.12.
Environmental Justice X No minority or low-income
populations would be
disproportionately affected by the
Proposed Action or Alternatives.
Farmlands (prime or X The Proposed Action gen-tie
unique) traverses 6.6 miles of farmland of
statewide importance and 10.7 miles
of prime farmland, if irrigated and
reclaimed of excess salts and sodium
(Ormat GIS 2016); however, these
areas are not currently used for
agriculture. Under the Proposed
Action, there would be no impacts
on farmlands. The Proposed Action
would not convert farmland of
statewide importance or prime
farmland, if irrigated and drained of
excess salts and sodium, that is being
used for agriculture; thus, a Farmland
Conversion Impact Rating is not
required, and no further consultation
or coordination with NRCS is
required.1
Floodplains X Not present. The FEMA 100-year
floodplain is located over 1 mile east
of the nearest proposed well (FEMA
2008).
Invasive, Nonnative, X Carried forward in Section 3.10.
and Noxious Species
Migratory Birds X Carried forward in Section 3.5.
Native American X Carried forward in Section 3.13.
Religious Concerns
1
Francine Lheritier, NRCS, personal communication with Drew Vankat, EMPSi, on March 24, 2016, regarding
farmland conversion impact ratings.
3-2 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Table 8
Supplemental Authorities and Rationale for Detailed Analysis for the Proposed Action
Present/ Present/
Not
Elementsa Not May Be Rationale
Presentb
Affectedb Affectedc
Threatened or X After consulting with the BLM wildlife
Endangered Species biologist, no threatened, endangered,
candidate, or proposed species are
known to exist in the Project Area.
The USFWS determined that the
Lahontan cutthroat trout
(Oncorhynchus clarkia henshawi,
Threatened) should be considered in
an effects analysis for the Proposed
Action (USFWS 2016). However, no
suitable habitat for this species
occurs in the Project Area or within
the Dixie or Jersey Valleys that
comprise the watersheds surrounding
the Project Area. The nearest
location of this species is located in
Willow Creek and Big Den Creek,
approximately 17 miles east of the
southern gen-tie line and in Edwards
Creek, approximately 30 miles south
of the proposed plants. There is no
designated or proposed critical
habitat in the Project Area.
Hazardous or Solid X Carried forward in Section 3.17.
Wastes
Water Quality X Carried forward in Section 3.3.
(Surface/Ground)
Wetlands/Riparian X Carried forward in Section 3.9.
Zones
Wild and Scenic Rivers X Not present.
Wilderness/Wilderness X Carried forward in Section 3.16.
Study Areas
a
See BLM Handbook H-1790-1(BLM 2008a), Appendix 1, Supplemental Authorities to be Considered.
b
Supplemental authorities determined to be not present or present/not affected need not be carried forward or
discussed further in the document.
c
Supplemental authorities determined to be present/may be affected must be carried forward in the document.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-3
3. Affected Environment and Environmental Consequences
Table 9
Resources Other Than Supplemental Authorities
Present/
Not Present/May
Resource or Issue Not Rationale
Presenta Be Affectedb
Affecteda
Visual Resources X Carried forward in Section
3.11.
Minerals X Geothermal resources would
not be consumed during
operation due to use of a closed
loop system. A sales contract
with the BLM would be entered
into for use of mineral materials
consistent with BLM policies and
regulations; as such impacts on
minerals would be negligible.
Wildlife/Key Habitat X Carried forward in Section 3.7.
BLM Sensitive Species X Carried forward in Section 3.8.
Livestock Grazing X Impacts would be negligible
because development would
occur on a very small
percentage of each allotment
overlapping the project site and
because there would be no
reduction in animal unit
months2.
Socioeconomics X Carried forward in Section
3.18.
Fire Management X A Fire Contingency Plan is
included under all action
alternatives; therefore, no
impacts on fire management are
expected.
Soil Resources X Carried forward in Section 3.4.
Public Health and Carried forward in Section
Safety 3.17.
Paleontological X Paleontological resources are
Resources not present in the Project Area.
Lands with X Lands with wilderness
Wilderness characteristics are not present
Characteristics in the Project Area.
Recreation X Numerous access roads in the
vicinity allow for dispersed
recreation to continue. Project
construction is temporary in
2
An animal unit month is the amount of forage required by one animal unit for one month. An animal unit is
generally one mature cow and a calf, or their equivalent.
3-4 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Table 9
Resources Other Than Supplemental Authorities
Present/
Not Present/May
Resource or Issue Not Rationale
Presenta Be Affectedb
Affecteda
nature; recreation access
restrictions would only take
place during construction and
on active well pads.
Land Use X Carried forward in Section
Authorizations 3.15.
Travel Management X Carried forward in Section
3.14.
Vegetation X Carried forward in Section 3.6.
Wild Horses and X There are no herd areas or herd
Burros management areas that overlap
or occur within the Project
Area. Wild horses do move
through Dixie Valley and utilize
some springs in the valley for
water. However, the proposed
project would not be anticipated
to impact horses utilizing the
valley. There are no wild burros
present.
Source: BLM 2008a
a
Resources or uses determined to be not present or present/not affected need not be carried forward or discussed
further in the document.
b
Resources or uses determined to be present/may be affected must be carried forward in the document.
Air quality
Water resources
Soil resources
Migratory birds
Vegetation
Wildlife and key habitat
BLM sensitive species
Wetlands and riparian areas
Invasive, nonnative, and noxious weeds
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-5
3. Affected Environment and Environmental Consequences
Visual resources
Cultural resources (present/not affected)
Native American religious concerns
Travel management
Land use authorizations
Wilderness study areas
Public health and safety and hazardous materials
Socioeconomics
Under Section 162(a) of the Clean Air Act, certain federal lands defined as
Federal Class 1 Areas, such as national parks, national wilderness areas, and
national monuments, are granted special and the most restrictive air quality
protections. There are no Federal Class 1 Areas located in the project site, with
the nearest being the Desolation Wilderness Area, which is approximately 121
miles away from the project site. Due to the long distance between these two
sites, laws and regulations associated with Federal Class 1 Areas are not
applicable to the Dixie Meadows Geothermal Utilization Project.
3-6 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
The power plants would not release non-condensable gas during normal
operations. However, a small amount of the binary motive fluid (pentane or
butane isomers) would be released to the atmosphere from rotating seals and
flanges. During normal operations, a small quantity of air enters the motive fluid
loop in the air-cooled condenser. When purged, a small amount of the motive
fluid could be discharged to the atmosphere via the purge stack.
Some liquid motive fluid would be stored on-site in a tank. When the binary
power plant unit is opened, motive fluid liquid and vapor would first be removed
from the system and returned to the storage tank. NDEPs Bureau of Air
Pollution Control would issue a permit to ensure ambient concentrations of
ozone from these sources would not exceed applicable Ambient Air Quality
Standards.
No Action Alternative
Under the No Action Alternative, the BLM would not approve the Proposed
Action, the facilities would not be constructed, and ORNI 32 would likely
suspend exploration activities authorized under the two previous Decision
Records for the foreseeable future. As such, there would be no change in air
quality conditions at the site.
Surface Water
Dixie Valley is typical of many basin and range valleys in Nevada and has been
filled with thousands of feet of unconsolidated deposits of alluvial and lakebed
sediments. Surface water flows onto the valley floor only in response to
significant rainfall and snowmelt events in the adjacent mountains. It travels
down ephemeral drainages to the valley bottom where it collects on the playas,
and then evaporates. The largest playa is the Humboldt Salt Marsh, located in
the center of the Dixie Valley, which is traversed by a portion of the northern
gen-tie route.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-7
3. Affected Environment and Environmental Consequences
Two smaller adjacent playas are present on the property east of the hot springs
in T22N, R35E, Section 9 and at a slightly higher elevation than the Humboldt
Salt Marsh. The western playa appears to be the end-point for much of the
water that originates from the northern hot springs (described below) and from
stormwater runoff and often contains standing water. The smaller eastern playa
is more often dry. A third playa, located in T22N, R35E, Section 20, receives
runoff from upgradient areas, but is usually dry.
The hottest springs are located in the central and northern portion of this
series of springs, while cooler-temperature springs exist to the south.
Temperatures of surface water discharge have been reported to range from
137.3 F (58.5 C) at the Dixie Hot Spring in the north-central portion of the
complex, to 84 F (29 F) at discharge points in the south (Interflow Hydrology
and Mahannah and Associates 2012a).
The BLM and USGS conducted a site visit in October 2016 and recorded higher
spring temperatures at two main springs in the Dixie Hot Springs area. A spring
in T22N, R35E, Section 8 (NW quarter of the NE quarter) measured 152.6 F
(67 C); a spring in T22N, R35E, Section 5 (SW quarter of the SE quarter)
measured 163.4 F (73 C). An additional spring in T22N, R35E, Section 4 (NE
quarter of the SW quarter) measured 50 F (10 C).
The spring water flows east toward the Humboldt Salt Marsh and supports
wetlands and other vegetation both near the discharge and in down-gradient
areas (see Section 3.9, Wetlands and Riparian Areas), until evapotranspiration
consumes the flows.
3-8 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
See Figure 6, Surface Water, for springs and associated surface waters and
wetland areas, the applicable riparian area lease stipulation buffer extending
around these areas, and proposed well locations in the lease areas. This figure
also depicts ephemeral drainages.
Spring Monitoring
Monitoring was conducted by the US Geological Service (USGS) in Dixie Valley
as part of the interagency Groundwater Export Study conducted in Dixie Valley
by the US Bureau of Reclamation, State Engineer, and Churchill County, as well
as the USGS. This study (Huntington et al. 2014) included inventorying,
sampling, and monitoring streams, springs, and wells, and collecting precipitation
and evapotranspiration data throughout Dixie Valley between 2009 and 2011.
The USGS National Water Information System3 shows two water quality
observations at two springs near the lease area in 2009. Spring USGS-301
(Section 17) was monitored on October 27, 2009. Surface water temperature
was 29 C (84 F). Spring USGS-101 (Section 4) was monitored on October 30,
2009. Surface water temperature was 26 C (79 F). Additional water quality
parameters are included below:
Total dissolved solids (TDS) = 565 to 829 milligrams per liter (mg/L)
Specific conductance = 1,150 to 1,390 microSiemens per centimeter
pH = 7.8 to 8.5 standard units
Hardness = 34 to 60 mg/L
Alkalinity = 84 to 86 mg/L
Calcium = 11.3 to 22.8 mg/L
Magnesium = 0.59 to 1.34 mg/L
Sodium = 170 to 249 mg/L
Potassium = 1.15 to 2.97 mg/L
3
Internet website: https://waterdata.usgs.gov/nwis
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-9
3. Affected Environment and Environmental Consequences
3-10 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Additional water quality data for the Dixie Hot Springs in Section 5 are available
from the Great Basin Center for Geothermal Energy (2016). Two water
samples (DV97-69 and DV98-120) collected in 1997 and 1998, respectively, had
the following selected characteristics:
On September 27, 2016, ORNI 32 measured springs and seeps for flow,
electrical conductivity (EC), temperature, and pH as part of the Dixie Meadows
Water Resources Monitoring Plan (Ormat 2011) outlined for geothermal
exploration; no previous data were collected prior to 2016. The sites visited
were Dixie Corral Spring (USGS-101; T22N, R35E, section 4), the main Dixie
Meadows Hot Spring (NDOWSS-1; T22N, R35E, section 5), and a warm spring
(NDOWSS-2; T22N, R35E, section 17). Table 10, Seep and Spring Field Data,
September 27, 2016, outlines collected data.
Groundwater
The Project Area is located in the Dixie Valley Hydrographic Area (Basin 128 of
256 in the State of Nevada). This hydrographic area is part of the Central
Hydrographic Region (Number 10 of 14 in the state of Nevada), which is by far
the largest hydrographic region in Nevada at nearly 30 million acres. The Dixie
Valley Hydrographic Area is 833,920 acres, or less than 3 percent of the Central
Hydrographic Region. The Dixie Valley Hydrographic Area is a Nevada state
engineer-designated area or groundwater basin (NDWR 2015). The state
engineer designates groundwater basins when permitted groundwater rights
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-11
3. Affected Environment and Environmental Consequences
Table 10
Seep and Spring Field Data, September 27, 2016
Site Location Flow Rate Ec1 Degrees F pH
Corral Spring Small pool just Seep into marshy 860 67.2 8.1
(USGS-101) outside old wetland. Flow not
fence measurable.
NDOWSS-1 Sampled just Estimated at 5 gpm at 1,320 >1202 Not
(main hot spring) below pipe pipe. Multiple springs reported
discharge in area converge into
one channel about
150 feet downstream.
Flow there is
estimated at 50 to 60
gpm.
NDOWSS-2 Deep pool None 1,240 77.1 8.3
(Section 17) behind salt
cedar
NDOWSS-2 Pool at edge of None 1,280 86.7 8.2
(Section 17) grass
Source: Ormat 2016
1
Electrical conductivity (mhos/cm)
2
Temperature at this spring exceeded range of thermostat
approach or exceed the estimated average annual recharge and the water
resources are being depleted or require additional administration. The Dixie
Valley Hydrographic Area (Basin 128) was designated in 1978.
The NDWR lists the safe perennial yield of Basin 128 as 15,000 acre-feet/year.
The hydrographic basin summary for Basin 128 lists a total use of 15,660 acre-
feet/year, with the major uses of groundwater as irrigation (8,836 acre-
feet/year), and industrial (6,220 acre-feet/year); the remaining uses are quasi-
municipal, stockwater, and wildlife. Geothermal is considered industrial (12,704
acre-feet/year). NDWR considers geothermal use separate from that of
underground use. This is because it has a finite life and is not directly connected
to recharge received from the perennial yield.
Groundwater levels in Dixie Valley have remained generally constant since the
1950s. Observed changes are mostly in areas of historical, localized
development as a result of withdrawals for irrigation, livestock, and domestic
use, and from augmentation of geothermal reservoir pressure (Huntington et al.
2014).
Groundwater in the Dixie Valley occurs in two separate but related aquifer
systems: a shallow, non-thermal, alluvial and igneous rock basin-fill aquifer
system; and a deep, locally thermal, basement rock aquifer (Karst 1987).
Groundwater in the alluvial deposits occurs under unconfined and confined
3-12 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
conditions. Hydraulic heads are typically beneath the elevation of the valley
floor, but in some areas artesian flowing wells exist.
In the lease area near the valley floor, the playa deposits can be generally
characterized as a complex, interfingering, and laterally discontinuous sequence
of thin permeable layers of sand or gravel separated by thicker, low permeability
confining layers of silt and clay. Groundwater in the Dixie Valley playa is
chemically distinct from the groundwater in the alluvial deposits. Groundwater
mixing between playa and alluvial fill groundwater systems is also likely physically
impeded by transmissivity contrasts of about four orders of magnitude
(Huntington et al. 2014). Therefore, groundwater flow and exchange between
the basin-fill aquifer and playa are physically and chemically limited.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-13
3. Affected Environment and Environmental Consequences
Four shallow wells in the central part of Dixie Valley near the lease area, ranging
in depth from 10 to 50 feet and in diameter from 1 to 2 inches, were monitored
for water levels by the USGS (Nevada State Wells 109435, 109491, 108770, and
108771; USGS 2016). Depth-to-water measurements in these wells ranged from
approximately 0.5 to 14 feet below ground surface. Groundwater quality
samples collected in November 2009 and May 2010 for two of the USGS wells
(109491 and 109435; USGS 2016) showed the following characteristics:
3-14 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
was reported. Ormat retested the well in May 2012 and observed an initial flow
rate of 25 gpm, which decreased to 20 gpm after 20 minutes at a temperature
of 72.9 F (Ormat 2012). In September 2016, an initial flow rate of 25 gpm at
64.1 F was observed, which decreased to 16 gpm after 30 to 40 minutes at a
temperature of 73.2 F (Ormat 2016). Sampling confirmed that the groundwater
does not meet drinking water standards for several parameters. Sampling results
for MW-1 for May 2012 and September 2016 are summarized in Table 11,
MW-1 Sampling Results; May 2012 and September 2016 (Ormat 2012; 2016).
Table 11
MW-1 Sampling Results; May 2012 and September 2016
Monitoring Parameter Result1 (2012) Result1 (2016)
Free cyanide ND No data reported
Ammonia, as Nitrogen 0.66 No data reported
pH 8.08 8.24
Total Suspended Solids ND 2
Bicarbonate (HCO3) 160 130
Carbonate (CO3) ND ND
Hydroxide (OH) ND ND
Total alkalinity (as CaCO3) 130 130
Orthophosphate 0.027 No data reported
Chloride 1,600 1,600
Fluoride 8.8 6.2
Sulfate 220 170
Nitrate nitrogen ND ND
Nitrite nitrogen ND No data reported
Total Dissolved Solids 2,900 3,100
Electrical conductivity 5,800 4,100
Aluminum 0.19 0.085
Barium 0.042 0.045
Beryllium ND ND
Boron No data reported 1.7
Cadmium ND ND
Calcium No data reported 27
Chromium ND ND
Copper ND ND
Iron 0.57 0.25
Lithium No data reported 0.483
Magnesium 2.1 2.2
Manganese 0.098 0.082
Molybdenum ND ND
Nickel ND ND
Potassium No data reported 7.1
Silica No data reported 41
Silver ND ND
Sodium 1,200 1,300
Zinc ND ND
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-15
3. Affected Environment and Environmental Consequences
Table 11
MW-1 Sampling Results; May 2012 and September 2016
Monitoring Parameter Result1 (2012) Result1 (2016)
Mercury 0.0016 ND
Antimony ND ND
Arsenic 0.011 0.014
Lead ND ND
Selenium ND 0.0056
Thallium ND ND
Sources: Ormat 2012; 2016
1
All results are in mg/L, except for pH (standard units) and electrical conductivity (mhos/cm)
ND = Not detected (less than reporting limit)
No data reported = sample parameter data not reported
Geothermal Resources
Dixie Valley is the hottest (temperatures over 545 F [285 C] at 9,800 feet
depth) and one of the largest geothermal systems in the Basin and Range
province (Blackwell et al. 2009). A considerable volume of research into the
Dixie Valley geothermal area has been conducted to characterize and describe
the areas geothermal resources (Benoit 1999; Blackwell et al. 2002; Blackwell
et al. 2003; McKenna and Blackwell 2004; Blackwell et al. 2007; Blackwell et al.
2009). The region has been used as a field laboratory to develop and test
geothermal exploration methods (Iovenitti et al. 2013).
The Dixie Valley geothermal system occurs along the fault zone bounding the
Dixie Valley and the Stillwater Range on the western edge of the valley
(Blackwell et al. 2007). The Dixie Meadows is in the southern portion of this
nearly 20-mile-long system. In this area, geothermal groundwater resources
locally occur in fractured zones within the bedrock underlying the basin-fill
deposits (Blackwell et al. 2003; Blackwell et al. 2009; McKenna and Blackwell
2004).
3-16 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
The existing Terra-Gen Dixie Valley Geothermal Facility located north of the
lease area provides an opportunity to compare geothermal water attributes
with basin-fill water aquifer attributes; this comparison is shown in Table 12,
below. Based on generally similar geologic and hydrogeologic conditions, the
water quality differences between the two aquifers at the Terra-Gen Dixie
Valley Geothermal Facility are anticipated to be similar to those exhibited in the
proposed lease area.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-17
3. Affected Environment and Environmental Consequences
Table 12
Comparison of Geothermal and Non-Geothermal Groundwater Quality Near the Terra-
Gen Dixie Valley Geothermal Facility
Geothermal Water Typical Non-geothermal Water
Ion Pairs
Range (meq/liter1) Typical Range (meq/liter1)
Sodium + potassium 90 to >95 percent 20 to 80 percent
Calcium + magnesium <5 to 10 percent 20 to 80 percent
Chloride + sulfate 25 to 90 percent 25 to 85 percent
Bicarbonate + carbonate 5 to 75 percent 5 to 75 percent
Source: Nimz et al. 1999
1
meq/L = milliequivalents per liter, or milligrams per liter divided by the combining weights of the indicated ions.
Water Rights
According to the NDWR (2016a), as of February 7, 2017, there are a total of
1,065 records in the Dixie Valley Hydrographic Area (Area code 128). Of these,
319 are certificated, permitted, ready for action, ready for action (protested), or
vested rights.
There are four vested claims on springs that are held by the current livestock
grazing permittee for stockwatering (NDWR 2016a). These claims are on
springs in the vicinity of the Dixie Hot Springs and warm and cold springs
nearby (all are in Township 22 North, Range 35 East), as follows:
In addition to the four vested rights listed, there are two active applications
(ready for action) held by Churchill County for municipal and quasi-municipal
use in Township 22 North, Range 35 East:
3-18 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
There are additional water rights in the vicinity of the Dixie Hot Springs; these
rights are vested, certificated, permitted, and ready for action (see Table 13,
below). For the most part, vested rights are used for stock water use, and one
right is used for irrigation (NDWR 2016a).
Table 13
Water Rights Summary
Township and Range CER1 PER1 RFA1 RFP1 VST1
T20N R34E 3 1 2 0 0
T21N R34E 5 2 8 0 0
T21N R35E 18 0 0 1 2
T22N R34E 0 0 4 0 0
T22N R35E 0 0 2 0 4
T22N R36E 1 0 0 0 0
T23N R35E 0 0 2 0 3
T23N R36E 0 0 0 0 0
T24N R35E 0 0 0 0 2
T24N R36E 0 8 2 0 1
Sub-Totals 27 11 20 1 12
Total Rights 71
Source: NDWR 2016b
1
Water Rights Use Codes:
CER: Certificated
PER: Permitted
RFA: Ready for action
RFP: Ready for action (protested)
VST: Vested
Within the wider hydrographic area, rights are used for the following purposes
(NDWR 2016a): commercial, domestic, industrial, irrigation (Carey Act),
irrigation, (desert-land entry), irrigation, mining and milling, municipal, other,
power, quasi-municipal, stockwatering, and wildlife.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-19
3. Affected Environment and Environmental Consequences
Reserve pits would be constructed at each well pad to contain and temporarily
store drilling mud, drill cuttings, stormwater runoff, and the geothermal fluid
produced during well testing. Because nontoxic drilling mud would be used, the
reserve pits are not proposed to be lined. Additionally, the bentonite drilling
muds discharged into the reserve pits would tend to act as a liner, in the same
way they prevent the loss of drilling fluids in the well bore into the surrounding
rock. Therefore, contamination of the shallow groundwater aquifer from
temporary drilling discharges into the reserve pits is unlikely.
As stated in Section 2.1.3, the volume of geothermal fluid reinjected into the
reservoir would be slightly less than the volume used due to the lower post-
production temperature of the fluid. Because reinjected fluid would have a
lower post-production temperature, this could also impact the temperature of
springs and groundwater aquifers that may have a connection to the geothermal
source. If cooler post-production water mixed with water supplied to the
springs, this could lower the temperature of output flow.
3-20 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
During initial well testing, a relatively small volume of geothermal fluid would be
discharged to the reserve pits. This could potentially reduce the geothermal
inflow to seeps and springs, leading to short-term reductions in water quantity
discharged and water temperature. However, the volume of fluid withdrawn
during the relatively short-duration well tests would be minor compared with
the volume of fluid naturally available in the geothermal resource. Removing
small volumes of geothermal fluid during testing would be anticipated to have
only a short-term, minor impact, if any at all, on the quantity or temperature of
surface water expressions at springs in the Project Area. Implementing the
Aquatic Resources Monitoring and Mitigation Plan would allow any impacts to
be quickly identified and mitigated.
Pipelines would carry geothermal fluids from each well pad to the production
plants. Should an accidental discharge of geothermal fluid occur during pipeline
transport, impacts on geothermal water quantity or surface or groundwater
quality and quantity could occur. Over the operational life of the project,
accidental discharges of geothermal fluids are unlikely because of the frequent
inspections and ultrasonic testing of the geothermal pipelines, the pipeline flow
and pressure monitoring, and the well pump and pipeline valve shutdown
features; however, should an geothermal fluids be accidentally discharged,
operations would be temporarily suspended and the BLM would be notified to
determine the appropriate mitigation measures.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-21
3. Affected Environment and Environmental Consequences
directed into ditches surrounding the disturbed areas and back onto
undisturbed ground consistent with BLM BMPs for stormwater. Access roads
would also be constructed and maintained consistent with the BLM BMPs for
road construction applicable to the intended use (temporary or permanent) of
the road.
Because the Dixie Valley Hydrographic Area (Basin 128) is designated by the
state engineer as over-appropriated, groundwater consumption may have
temporary impacts on groundwater quantity. This would be the case if overall
consumption were to exceed the perennial yield. Impacts could decrease
3-22 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-23
3. Affected Environment and Environmental Consequences
The following are additional mitigation measures that could be applied if adverse
impacts on water quality, quantity, or temperature are observed:
The southern gen-tie ROW does cross several ephemeral drainages that may
flow into or near the cold springs and seeps in the southern portion of the
Dixie Meadows area (T22N, R35E, Sections 18 and 19). These features are
between 1,700 and 2,100 feet from the southern gen-tie alignment. Because
these springs are believed to be fed by groundwater, as opposed to surface
recharge from ephemeral drainages, impacts on the quantity or temperature of
surface discharge from the springs from project construction is unlikely;
however, erosion from ROW construction could increase sedimentation to
these springs and decrease groundwater infiltration and recharge rates. To avoid
3-24 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
No Action Alternative
Under the No Action Alternative, the BLM would not approve the Proposed
Action, the facilities would not be constructed, and ORNI 32 would likely
suspend exploration activities authorized under the two previous Decision
Records for the foreseeable future. As such, there would be no change in
existing water resources conditions at the site.
As shown in Table 14, the three soil map units underlying the greatest length
of the gen-tie alignments are the Slaw-Trocken-Chuckles association, Bluewing-
Pineval association, and Mazuma very fine sandy loam, 0 to 4 percent slopes.
The Pelic-Turupah complex, 0 to 1 percent slopes, are hydric soils that underlie
most wetland and riparian areas in Dixie Meadows; these soils comprise
approximately 1 percent of soils in the Proposed Action area but are included in
this analysis due to their uniqueness in the Project Area.
The candidate power plant locations are located entirely within the Bluewing-
Pineval association. Most well pads are also in the Bluewing-Pineval association;
the southernmost two pads are in the Slaw-Trocken-Chuckles association.
The soil series comprising these four map units are described in detail below.
Slaw-Trocken-Chuckles association
The Slaw series consists of very deep, well drained soils that formed in alluvium
over lacustrine deposits derived from mixed rocks. Slaw soils are on alluvial
flats, floodplains, basin floors, lake plains, floodplain playas, drainageways, and
low stream terraces. Slopes are 0 to 4 percent.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-25
3. Affected Environment and Environmental Consequences
Table 14
Gen-Tie Soil Map Units (Miles)
Proposed
Soil Map Alternative Landscape
Action Wind Water
Unit 1 (miles) Position Surface
(miles) Erosion Erosion
(Key (Percent Percent Texture
(Percent Hazard1 Hazard2
Number) Total) Slope
Total)
Appian-Juva- 1.8 (6%) Bolsons,3 Loam 5 Slight
Bango lake terraces,
association drainageways
(476513) 0 to 2%
Bluewing-Inmo 1.3 (4%) Inset fans and Very 7 Slight
association fan cobbly
(476468) piedmonts4 loam
2 to 8%
Bluewing- 7.9 (17%) 3.0 (10%) Fan Very 3 Slight
Pineval piedmonts, gravelly
association drainageways, loamy
(476471) inset fans sand
4 to 8%
Bango-Stumble 1.7 (6%) Lake Sandy 3 Slight
association terraces, loam
(476499) bolsons, sand
sheets
0 to 4%
Chuckles- 3.4 (11%) Bolsons, lake Loam 5 Slight
Bango terraces
association 0 to 2%
(476572)
Genegraf- 2.9 (10%) Fan Gravelly 5 Slight
Rednik- remnants, fan fine sandy
Trocken piedmonts loam
association 2 to 15%
(476426)
Hessing-Dun 1.3 (3%) Fan Silt loam 5 Slight
Glen-Bango piedmonts,
association fan skirts
(476594) 2 to 4%
Hessing- 0.5 (1%) Fan Silt loam 5 Slight
Wholan-Dun piedmonts,
Glen fan skirts
association 0 to 4%
(476593)
Jerval-Chilper- 0.9 (2%) Fan Loam 5 Slight
Bluewing piedmonts,
association fan remnants
(475203) 2 to 8%
3-26 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Table 14
Gen-Tie Soil Map Units (Miles)
Proposed
Soil Map Alternative Landscape
Action Wind Water
Unit 1 (miles) Position Surface
(miles) Erosion Erosion
(Key (Percent Percent Texture
(Percent Hazard1 Hazard2
Number) Total) Slope
Total)
Juva-Wholan- 4.8 (16%) Fan Loam 5 Slight
Stumble piedmonts,
association fan skirts
(476591) 0 to 4%
Mazuma very 5.7 (12%) Fan skirts, Very fine 3 Slight
fine sandy bolsons sandy
loam, 0 to 4 0 to 4% loam
percent slopes
(476639)
Mazuma-Yipor 4.0 (9%) Lake plains Very fine 4 Slight
association 0 to 2% sandy
(475345) loam
Misad- 2.6 (6%) Fan Gravelly 5 Slight
Golconda- piedmonts, very fine
Tenabo fan skirts, fan sandy
association remnants loam
(475302) 2 to 8%
Oxcorel- 1.6 (3%) Fan Gravelly 5 Slight
Whirlo- piedmonts, very fine
Trocken fan remnants, sandy
variant fan collars, loam
association inset fans
(475296) 2 to 8%
Pelic-Turupah 0.4 (1%) Flood plains, Sand 8 Slight
complex, 0 to delta plains
1 percent 0 to 2%
slopes
(476696)
Playas 0.2 (<1%) No data Silty clay 4 Not rated
(476684)
Preble variant- 0.5 (1%) Bolsons, Very fine 3 Slight
Whirlo alluvial flats, sandy
association fan aprons loam
(475242) 2 to 8%
Rednik- 2.8 (9%) Fan Very 6 Slight
Trocken- piedmonts, gravelly
Bluewing fan remnants, sandy
association inset fans loam
(476531) 4 to 8%
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-27
3. Affected Environment and Environmental Consequences
Table 14
Gen-Tie Soil Map Units (Miles)
Proposed
Soil Map Alternative Landscape
Action Wind Water
Unit 1 (miles) Position Surface
(miles) Erosion Erosion
(Key (Percent Percent Texture
(Percent Hazard1 Hazard2
Number) Total) Slope
Total)
Rednik- 0.6 (1%) 0.2 (<1%) Fan Very 6 Slight
Trocken- remnants, fan gravelly
Genegraf piedmonts, sandy
association beach loam
(476532) terraces
2 to 8%
Settlement- 2.1 (5%) Lake Silty clay 4 Slight
Louderback- terraces,
Rustigate bolsons
association 0 to 2%
(476546)
Slaw-Chuckles 1.2 (3%) Stream Silt loam 5 Slight
association terraces,
(476549) semi-bolsons,
lake terraces
0 to 2%
Slaw-Juva- 3.1 (10%) Stream Silt loam 5 Slight
Wholan terraces,
association semi-bolsons,
(476548) inset fans
0 to 2%
Slaw-Mazuma- 1.9 (4%) Stream Silt loam 5 Slight
Hessing terraces,
association semi-bolsons,
(476550) lake terraces,
beach plains
0 to 4%
Slaw-Trocken- 10.2 (22%) 4.5 (15%) Stream Silt loam 5 Slight
Chuckles terraces,
association semi-bolsons,
(476551) inset fans,
lake terraces
0 to 4%
Trocken- 1.8 (6%) Fan Gravelly 2 Slight
Bluewing piedmonts, loamy
association alluvial fans, sand
(476518) inset fans
2 to 8%
3-28 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Table 14
Gen-Tie Soil Map Units (Miles)
Proposed
Soil Map Alternative Landscape
Action Wind Water
Unit 1 (miles) Position Surface
(miles) Erosion Erosion
(Key (Percent Percent Texture
(Percent Hazard1 Hazard2
Number) Total) Slope
Total)
Weso very fine 2.0 (4%) Fan Very fine 3 Slight
sandy loam, 0 piedmonts, sandy
to 2 percent fan skirts loam
slopes 0 to 2%
(475289)
Whirlo- 2.1 (5%) Fan Very 7 Slight
Beoska- piedmonts, gravelly
Oxcorel fan skirts, fan loam
association remnants
(475249) 2 to 8%
Wholan very 2.5 (5%) Fan Very fine 3 Slight
fine sandy piedmonts, sandy
loam, rarely fan skirts loam
flooded, 0 to 2 0 to 2%
percent slopes
(475169)
Yipor silt loam, 0.1 (<1%) Semi-bolsons, Silt loam 4 Slight
sandy stream
substratum terraces
(475176) 0 to 2%
Source: NRCS 2016; NRCS GIS 2016
1
Wind erosion potential is classified on a scale between 1 and 8, with a rating of 1 for soils that are highly
susceptible to wind erosion, and a rating of 8 for soils that are the least susceptible to wind erosion.
2
The hazard is described as slight, moderate, severe, or very severe.
3
A semiarid, flat-floored desert valley or depression, usually centered on a playa or salt pan and entirely
surrounded by hills or mountains
4
A landform created at the foot of a mountain or mountains by debris deposited by shifting streams
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-29
3. Affected Environment and Environmental Consequences
3-30 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-31
3. Affected Environment and Environmental Consequences
3-32 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
The Trocken series consists of very deep, well drained soils that formed in
alluvium derived from mixed rocks. Trocken soils are on alluvial fans, fan
remnants, inset fans, fan skirts, longshore bars, barrier beaches, beach terraces,
and lake terraces. Slopes are 0 to 30 percent.
The Chuckles series consists of very deep, moderately well drained soils that
formed in alluvium derived from mixed rocks over lacustrine sediments.
Chuckles soils are on lake plains, lake terraces, and lagoons. Slopes are 0 to 2
percent (NRCS 2016).
Bluewing-Pineval association
The Bluewing series consists of very deep, excessively drained soils that formed
in alluvium derived from mixed rocks. Bluewing soils are on fan remnants, beach
plains, alluvial fans, and inset fans. Slopes are 0 to 30 percent.
The Pineval series consists of very deep, well drained soils that formed in
alluvium derived from volcanic or mixed rocks. Pineval soils are on fan remnants
and fan aprons. Slopes are 2 to 30 percent (NRCS 2016).
The proposed wells and candidate power plant locations overlie the Bluewing-
Pineval association, described above.
This soil map unit is considered hydric. Hydric soils form under conditions of
saturation, flooding, or ponding long enough during the growing season to
develop anaerobic conditions in the upper part (Federal Register 1994). Under
natural conditions, these soils are either saturated or inundated long enough
during the growing season to support the growth and reproduction of wetland
vegetation.
Soil Erosion
The soils within the Project Area have been classified by NRCS for soil erosion
susceptibility by wind or water. The wind erodibility group consists of soils that
have similar properties affecting their susceptibility to wind erosion, and are
classified on a scale between 1 and 8. A rating of 1 is given to soils that are
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-33
3. Affected Environment and Environmental Consequences
highly susceptible to wind erosion, and a rating of 8 is given to soils that are the
least susceptible to wind erosion (NRCS 2016). The Bluewing-Pineval
association and Mazuma very fine sandy loam, 0 to 4 percent slopes soil unit
both have ratings of 3, while the Slaw-Trocken-Chuckles association has a rating
of 5. The Pelic-Turupah complex, 0 to 1 percent slopes, has a rating of 8.
The susceptibility of a soil to sheet and rill erosion by water was also classified
and rated by NRCS. There are two rating estimates, the soil K factor (whole
soil) and the erosion hazard. Soil K factor estimates are based primarily on
percentage of silt, sand, and organic matter and on soil structure and saturated
hydraulic conductivity, and indicates the erodibility of the whole soil (including
the presence of rock fragments). The ratings for erosion hazard indicate the
hazard of soil loss caused by sheet or rill erosion in areas where 50 to 75
percent of the soil surface has been exposed by logging, grazing, mining, or
other kinds of disturbance. The ratings for erosion hazard are based on slope
and soil erosion K factor. The hazard for both ratings are described as slight,
moderate, severe, or very severe. A rating of slight indicates erosion is unlikely
under ordinary climatic conditions (NRCS 2016). The hazard of soil loss to
sheet and rill erosion by water is slight for the Bluewing-Pineval and Slaw-
Trocken-Chuckles associations and the Mazuma very fine sandy loam, 0 to 4
percent slopes and Pelic-Turupah complex, 0 to 1 percent slopes units.
Soil Compaction
The soils within the Project Area have been classified by NRCS for soil
compaction. Soil compaction is an important factor related to soil erosion as it
tends to reduce water infiltration and increase runoff, which generally increases
soil erosion rates. Each soil is rated for its resistance to compaction, which is
predominantly influenced by moisture content; depth to saturation; percent of
sand, silt, and clay; soil structure; organic matter content; and content of coarse
fragments. A rating of high resistance indicates the soil is very favorable to
resisting compaction; moderate resistance indicates the soil is favorable to
resisting compaction; and low resistance indicates the soil has one or more
3-34 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
factors that favor the formation of a compacted layer (NRCS 2016). The Slaw-
Trocken-Chuckles association and the Pelic-Turupah complex, 0 to 1 percent
slopes, have a low resistance to soil compaction; the Mazuma very fine sandy
loam, 0 to 4 percent slopes unit has a moderate resistance to soil compaction;
and the Bluewing-Pineval association has high resistance to soil compaction.
Rating class terms for soil restoration potential indicate the extent to which the
soils are made suitable by the soil features that affect the soils ability to
recover. High potential indicates the soil has features very favorable for
recovery, and good performance should be expected; moderate potential
indicates the soil has features generally favorable for recovery, and fair
performance can be expected; low potential indicates the soil has one or more
features unfavorable for recovery, and poor performance can be expected. The
Slaw-Trocken-Chuckles association, Bluewing-Pineval association, the Mazuma
very fine sandy loam, 0 to 4 percent slopes unit, and Pelic-Turupah complex, 0
to 1 percent slopes unit, all have low potential for soil restoration.
The Proposed Action could result in several effects on soils by (1) increasing
erosion rates from grading and clearing of site, and/or (2) reducing soil
productivity and potential restoration success, by compacting the soil to a level
that prevents successful rehabilitation and eventual reestablishment of vegetative
cover to preconstruction composition and density.
Soil ratings of the three most prevalent soil map units in the Project Action
Area and the Pelic-Turupah complex, 0 to 1 percent slopes unit suggest the
susceptibility to sheet and rill erosion by water is slight. However, the
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-35
3. Affected Environment and Environmental Consequences
susceptibility of these soils to wind erosion ranges from low to moderately high,
and resistance to dust formation is low to moderate. The soils range from low
to high in ability to resist compaction; however, these soils all rate low for their
potential for soil recovery due to low amounts of available precipitation
received annually.
The Proposed Action would disturb soil through clearing and grading during
construction; protective vegetation, surface rock fragments, and soil structure
would be removed and/or disturbed. Removal of vegetation and soil surface
during construction would expose soil and increase the potential for wind- and
water-driven erosion and soil compaction. The project site has generally flat
topography, but grading would be performed on an as-needed basis to achieve
the necessary slope and elevation for new facilities. This region also has the
potential for high winds and infrequent strong rains, which could lead to
increased erosion rates and soil loss. The use of vehicles and equipment on
these disturbed areas could further increase the potential for wind- and water-
driven erosion, as well as contributing to soil compaction, thus reducing
restoration potential.
Hydric soils have been delineated by NRCS and occur within the Pelic-Turupah
complex, 0 to 1 percent slopes. Direct impacts on hydric soils would occur
from constructing the northern gen-tie alignment and the potential installation
of access roads. In general, overland travel on this soil unit would carry a high
risk for soil compaction. The risk would be greater if overland travel were to
occur when soils are wet. Soil compaction reduces infiltration and causes soils
to lose their ability to store and hold water, potentially leading to reduction or
loss of soil saturation. Potential reduction of infiltration rates and soil saturation
could cause indirect impacts on wetland vegetation, and potentially lead to
reduced cover and further impacts from erosion. Soil compaction would also
reduce the potential for successful revegetation of disturbed areas.
Indirect impacts on hydric soils could occur from utilization and injection of
geothermal fluids during operations or from installation of the proposed
northern gen-tie alignment. If water quantity were affected by project
operations (utilization and injection), it could potentially cause reduction or loss
of soil saturation. Additionally, if the proposed northern gen-tie alignment were
to alter natural surface flow patterns this could affect the hydrologic functions of
these soils. If water quality were affected by project operations, this could affect
nutrients stored in the hydric soils and in turn potentially lead to a loss of
wetland and riparian vegetation.
3-36 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-37
3. Affected Environment and Environmental Consequences
To reduce the potential for water-driven erosion in the Project Area and any
downgradient parcels, ORNI 32 would adhere to BMPs for access road
construction, would minimize cut and fill activities, and would incorporate
design features at the power plant sites to reduce erosion from stormwater
runoff.
To reduce the potential for wind-driven soil erosion, the speed limit on all
Project Area roads (including Dixie Valley Road) would be 25 miles per hour.
Periodically watering construction roads would help prevent fugitive dust
generation and would minimize soil loss from wind erosion. Reducing speed
limits would also lessen soil compaction impacts and would aid in soil
restoration and recovery.
To reduce the potential for soil loss from wind- and water-driven erosion, all
drill pads and new access roads would be covered in 4 to 6 inches of gravel to
create an all-weather, all-season surface. This surface would promote soil
stability and would minimize soil loss and dust generation.
These measures would reduce the potential for wind- and water-born erosion
and soil compaction and would increase soil restoration potential. However,
localized loss of topsoil from wind- and water-driven erosion would still be
expected.
3-38 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
No Action Alternative
Under the No Action Alternative, the BLM would not approve the Proposed
Action, the facilities would not be constructed, and ORNI 32 would likely
suspend exploration activities authorized under the two previous Decision
Records for the foreseeable future. As such, there would be no change in
existing soil resources conditions at the site.
Migratory Birds
A field survey of the geothermal lease areas and northern gen-tie line route was
conducted by two EMPSi biologists between May 28 and 30, 2011. The survey
included the area encompassing potential power plant sites and included a buffer
of 250 feet on either side of the proposed northern gen-tie line. Additional
biological surveys were previously conducted within the original 4.9-acre Dixie
Meadows lease area in 2009 (CH2M HILL 2009 in BLM 2010; see Figure 1 in
EMPSi 2016). Two EMPSi biologists conducted additional field surveys on June
14 and 15, 2016. The survey covered approximately 400 acres of previously
unsurveyed portions of the Project Area, as well as portions of the current
northern gen-tie alignment that are outside the 500-foot-wide buffer originally
surveyed in 2011.
Based on the habitats observed, numerous migratory bird species have the
potential to occur within the Project Area. Thirty-three bird species were
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-39
3. Affected Environment and Environmental Consequences
observed within and near the Project Area during field surveys, including
passerines such as western wood pewee (Contopus sordidulus), black-throated
sparrow (Amphispiza bilineata), horned lark (Eremophila alpestris), and raptors
such as red-tailed hawk (Buteo jamaicensis) and northern harrier (Circus cyaneus).
Complete lists of species observed during field surveys are included as Appendix
D of the Biological Survey Report (EMPSi 2016).
Two active common raven (Corvus corax) nests were observed in the northern
Dixie Valley during 2016 surveys. One nest was built in a small utility structure
within the gen-tie survey buffer. A second nest was in a salt cedar (Tamarix sp.)
shrub outside of the survey buffer, along Dixie Valley Road. Both nests
contained several young that were approaching fledging age (EMPSi 2016).
Surveys for migratory birds were conducted within the geothermal lease areas
and southern gen-tie line route and within a 1-mile buffer of this route, between
June and August 2013 (WRC 2013). Most of the species recorded during the
2013 surveys are common in the habitat types, such as the horned lark and
black-throated sparrow. Overall species diversity is low, likely due to the time
of year the survey was conducted, the uniformity of the habitat, and lack of
structural diversity and water. A list of all bird species observed during the 2013
surveys is included as Appendix D of the biological survey report (WRC 2013).
EMPSi coordinated with the Great Basin Bird Observatory (GBBO) to gain
additional data on migratory birds observed near the Proposed Action.4 GBBO
provided point count data for five migratory bird transects within 6.2 miles (10
kilometers) of the Proposed Action (GBBO 2016). All point count surveys were
conducted in June 2013. Migratory birds commonly observed by GBBO are
black-throated sparrow and horned lark; for both species, breeding behavior
was displayed at multiple point count locations. Breeding mourning dove
(Zenaida macroura) was also observed. Nineteen species were observed by
GBBO on the five transects.
GBBO observed several USFWS Birds of Conservation Concern; these are sage
sparrow (Amphispiza belli) and sage thrasher (Oreoscoptes montanus). Both species
have potential to occur in the vicinity of the Proposed Action due to the presence
of suitable habitat, as summarized below. GBBO observed loggerhead shrike
(Lanius ludovicianus) and Brewers sparrow (Spizella breweri) on one transect each;
breeding behavior was not displayed for either species. Sage thrasher, loggerhead
shrike, and Brewers sparrow are BLM sensitive species and are further discussed
in Section 3.8, BLM Sensitive Species.
Additional species reported by GBBO are red-tailed hawk, barn swallow (Hirundo
rustica), blue-gray gnatcatcher (Polioptila caerulea), common nighthawk (Chordeiles
4
GBBO has not been formally consulted through a contract agreement. GBBO played no role in the project other
than providing data.
3-40 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Finally, the 430,500-acre Lahontan Valley Wetlands Important Bird Area (IBA) is
located approximately 12 to 13 miles west of the Proposed Action. The IBA
forms the most important waterfowl breeding and migratory site in Nevada and
is critical to many species using the Pacific Flyway (Audubon Society 2016).
Species using this important bird area may also use habitats in the Dixie Valley
or Jersey Valley.
Habitats found within the Project Area that support life requisites of migratory
birds are described in detail in Section 3.7, Wildlife and Key Habitat.
Table 15
Birds of Conservation Concern
Species Habitat Potential for Occurrence
Sage sparrow Treeless sagebrush or salt desert Potential to occur.
Amphispiza belli shrubland, with little or no cheatgrass
invasion.
Long-billed curlew Grasslands and irrigated agricultural Potential to occur. Detected
Numenius americanus fields. within 1 mile of Project Area.
Green-tailed towhee Thickets, chaparral, shrublands, riparian Potential to occur.
Pipilo chlorurus scrub, and especially sagebrush.
Eared grebe Marshes, ponds and lakes; in migration Potential to occur.
Podiceps nigricollis and winter also salt lakes, bays,
estuaries and seacoasts. Nests in areas
with seasonal to permanent water.
American avocet Open flats or areas with scattered tufts The US Navy at NAS Fallon
Recurvirostra of grass on islands or along lakes has observed species in Dixie
americana (especially alkaline) and marshes. Valley Settlement Area.
Calliope Mountains; along meadows, canyons Wintering habitat present;
hummingbird and streams, in migration and winter potential to winter in Project
Stellula calliope also in chaparral, lowland brushy areas, Area.
deserts.
Sources: EMPSi 2016; USFWS 2008; 2016; WRC 2013; GBBO 2010; NatureServe 2015; Wildlife Action
Plan Team 2012
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-41
3. Affected Environment and Environmental Consequences
Table 16
Game Birds Below Desired Condition
Species Habitat Potential for Occurrence
Canvasback Marshes, ponds, lakes, rivers, and Potential to occur. Observed within
Aythya valisineria bays. Dixie Meadows during 2009 surveys.
Ring-necked duck Marshes, lakes, rivers, swamps, Potential to occur. Observed within
Aythya collaris especially in wooded areas. Dixie Meadows during 2009 surveys.
Wood duck Quiet inland waters near woodland, Potential to occur. Observed within
Aix sponsa such as wooded swamps, ponds, Dixie Meadows during 2009 surveys.
marshes, and along streams.
Northern pintail Lakes, rivers, marshes, and ponds in Potential to occur. Observed within
Anas acuta grasslands, barrens, dry tundra, or Dixie Meadows during 2009 surveys
cultivated fields. and 2013 surveys.
Mallard Primarily shallow waters. Potential to occur. Observed within
Anas platyrhynchos Dixie Meadows during 2009 surveys
and 2013 surveys.
Canada goose Various habitats near water. Observed on NAS Fallon lands in the
Branta canadensis Dixie Valley
Mourning dove Found in a variety of habitats except Observed within Project Area and
Zenaida macroura playas. within one mile of Project Area
within Dixie Meadows during surveys.
Sources: EMPSi 2016, WRC 2013; GBBO 2010; NatureServe 2015; USFWS 2004
3-42 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
The proposed gen-tie would cross seven vegetation types, as follows: 26.3 miles
(55 percent) would cross Inter-Mountain Basins Mixed Salt Desert Scrub; 12.6
miles (26 percent) would cross Inter-Mountain Basins Greasewood Flat; 3.5
miles (7 percent) would cross Inter-Mountain Basins Big Sagebrush Shrubland;
3.2 miles (7 percent) would cross Invasive Annual Grassland; 1.3 miles (3
percent) would cross Invasive Annual and Biennial Forbland; 0.7 mile (1 percent)
would cross Inter-Mountains Basins Playa; and 0.5 miles (less than 1 percent)
would cross North American Arid West Emergent Marsh (Ormat GIS 2016;
SWReGAP GIS 2005).
A BBCS (see Appendix C) was developed. Its purposes are to reduce the
potential of injury or mortality to migratory birds from project construction and
operation, to ensure adequate monitoring is in place to determine if mortalities
are occurring, and to provide a mechanism to implement adaptive management
as needed to reduce injury or mortality.
Mortality may also occur from bird strike during drilling operations when drill
rigs up to 50 feet tall may be used. Bird strike may be particularly pronounced
for night-migrating species, which may become disoriented by night-time lights
on tall structures (Rich and Longcore 2006). To reduce this potential impact,
lights on the drill rig derricks should pulse at the minimum intensity and
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-43
3. Affected Environment and Environmental Consequences
Ponds, tanks, and impoundments (including but not limited to drill reserve pits)
containing liquids can present hazards to migratory birds (BLM 2008c).
Migratory bird access to any liquids contaminated by substances that may be
harmful due to toxicity, fouling of the feathers (detergents and oils), or
excessive temperatures would be excluded by wildlife-proof fencing, netting, or
other covering at all times when not in active use. This measure would conform
to Appendix D, Best Management Practices Mitigation Measures, of the BLMs
2008 geothermal leasing PEIS (see Appendix F).
Indirect, temporary effects from noise, human presence, and heavy equipment
present during construction activities may lead to displacement from suitable
habitat. This may lead to reduced breeding and/or nesting success for individuals
within or near the project footprint. This in turn may affect foraging
opportunities for species that prey on adult birds, nestlings, or eggs. Raptor
species that prey on small mammals, rodents, and lizards may avoid foraging
within or adjacent to the project footprint during construction activities and
could therefore be temporarily affected.
The noise from drilling wells and the construction of a geothermal power plant
would have a different effect on nearby birds than the noise from operation of a
geothermal power plant. This is because the noise generated during drilling and
construction are louder than the noise generated during plant operation. This
noise may temporarily displace birds during drilling or construction activities.
On the other hand, the consistent and lower decibel background noise emitted
from a power plant inhibits birds ability to hear sounds and communicate to
each other. This explains why pairing success and nest density is significantly
reduced in the presence of consistent anthropogenic noise (Barber et al. 2009).
Therefore, temporary and/or permanent habitat loss may be greater than the
actual project footprint.
Operation of the gen-tie line could result in direct mortality from bird strikes
and electrocution. This is particularly true for larger bird species and raptors.
Due to potential for electrocution, collision, and nesting or perching by
migratory birds on overhead power lines, the APLIC guidelines (2006; 2012)
would be implemented to reduce this risk through facility design and would
3-44 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
comply with the MBTA and other federal wildlife laws. These measures are
discussed in detail in Section 5.1 of the BBCS.
The proposed action for the gen-tie line would pass through the northern
portion of Dixie Meadows. Approximately 6,200 linear feet of the gen-tie
crosses North American Arid West Emergent Marsh and Inter-Mountain Basins
Playa, wetland areas as delineated in 2007 on US Navy lands, and wetlands on
BLM-administered lands from the USFWS National Wetland Inventory (Ormat
GIS 2016; SWReGAP GIS 2005; Navy GIS 2016; NWI GIS 2016). Construction
of the gen-tie could cause changes in hydrology and functioning of the wetland
and playa habitats that are critical for breeding and migration of migratory birds.
Therefore, the impacts described above would be higher in the Dixie Meadows
area, compared with other portions of the gen-tie alignment.
The amount of vegetation type disturbance from wells, power plant(s), and
access roads and pipelines would be the same as described under the Proposed
Action.
The gen-tie under Alternative 1 would cross four vegetation types, as follows:
22.7 miles (73 percent) would cross Inter-Mountain Basins Mixed Salt Desert
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-45
3. Affected Environment and Environmental Consequences
The southern gen-tie route would not impact the Dixie Meadows area or any
other seeps, springs, wetland, or riparian vegetation. Because this alternative
does not include gen-tie construction or operation in wetland or riparian areas,
direct and indirect impacts on migratory bird habitat during critical nesting and
migration periods would likely be substantially reduced, compared with the
Proposed Action.
No Action Alternative
Under the No Action Alternative, the BLM would not approve the Proposed
Action, the facilities would not be constructed, and ORNI 32 would likely
suspend exploration activities authorized under the two previous Decision
Records for the foreseeable future. As such, there would be no change in
existing migratory bird migration, foraging, or nesting conditions at the site.
3.6 VEGETATION
Coverage areas for both surveys included the proposed geothermal lease sites;
but the precise survey boundaries varied slightly between the two surveys. For
these reasons, acres of landcover types reported are approximate and cannot
simply be added together to give a total of each landcover type in the Project
Area. Nevertheless, reported acres represent the relative abundance of each
landcover type in the Project Area.
Plant species commonly observed in the Project Area include Indian ricegrass
(Achnatherum hymenoides), budsage (Artemisia spinescens), four-wing saltbush (A.
canescens), shadscale (A. confertifolia), cheatgrass (Bromus tectorum), yellow
rabbitbrush (Chrysothamnus viscidiflorus), halogeton (Halogeton glomeratus),
winterfat (Krascheninnikovia lanata), Russian thistle or tumbleweed (Salsola
tragus), greasewood (Sarcobatus spp.), and seepweed (Suaeda nigra; ESRS 2013).
3-46 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Table 17
SWReGAP Landcover Types
Approximate Acres
SWReGAP Northern Southern
Landcover Description Geothermal
Landcover Type Gen-Tie Gen-Tie
Lease Areas
Line1 Line2
Inter-Mountain Open-canopied shrublands of 638 2,545 283
Basins Mixed Salt typically saline basins, alluvial slopes,
Desert Scrub and plains; substrates are often saline
and calcareous, medium- to fine-
textured, alkaline soils; vegetation
characterized as typically open to
moderately dense shrubland
composed of one or more saltbush
(Atriplex) species; herbaceous layer
varies from sparse to moderately
dense.
Inter-Mountain Typically occurs near drainages on 305 477 247
Basins Greasewood stream terraces and flats or may
Flat form rings around more sparsely
vegetated playas; typically have saline
soils, a shallow water table and flood
intermittently, but remain dry for
most growing seasons; usually occurs
as a mosaic of multiple communities,
with open to moderately dense
shrublands dominated or co-
dominated by greasewood
(Sarcobatus spp.); often surrounded
by mixed salt desert scrub.
Invasive Shrubland, Areas dominated by introduced 110 198 0
Forbland, or shrubs and/or annual, biennial, and/or
Grassland perennial forbs and grasses.
Inter-Mountain Occurs in broad basins between 83 0 0
Basins Big Sagebrush mountain ranges, plains, and foothills.
Shrubland Soils are typically deep, well-drained,
and non-saline. These shrublands are
dominated by big sagebrush (Artemisia
tridentata ssp. tridentata or A. t. ssp.
wyomingensis). Perennial herbaceous
components usually contribute less
than 25% vegetative cover.
North American Frequently or continually inundated, 12 0 5
Arid West Emergent with water depths up to 2 meters.
Marsh Water levels may be stable or may
fluctuate one meter or more over
the course of the growing season.
Vegetation is characterized by
herbaceous plants that are adapted
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-47
3. Affected Environment and Environmental Consequences
Table 17
SWReGAP Landcover Types
Approximate Acres
SWReGAP Northern Southern
Landcover Description Geothermal
Landcover Type Gen-Tie Gen-Tie
Lease Areas
Line1 Line2
to saturate soil conditions, such as
rushes (Juncus spp.) and cattails
(Typha spp.)
Inter-Mountain Composed of barren and sparsely 18 8 0
Basins Playa vegetated playas (generally less than
10 percent plant cover); salt crusts
are common, with small saltgrass
(Distichlis sp.) beds in depressions and
sparse shrubs around the margins;
intermittently flooded.
Inter-Mountain Often composed of a mosaic of 0 3 0
Basins Active and migrating, bare dunes; anchored
Stabilized Dune dunes with sparse to moderately
dense vegetation (less than 10 to 30
percent canopy cover); and stabilized
dunes.
Source: EMPSi 2016; WRC 2013; USGS 2005; SWReGAP GIS 2005
1
Acreage calculated within a 100-foot buffer of the proposed northern gen-tie line route
2
Acreage calculated within a 200- to 500-foot buffer from the southern gen-tie line route
The proposed gen-tie would cross seven vegetation types, as follows: 26.3 miles
(55 percent) would cross Inter-Mountain Basins Mixed Salt Desert Scrub; 12.6
3-48 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
miles (26 percent) would cross Inter-Mountain Basins Greasewood Flat; 3.5
miles (7 percent) would cross Inter-Mountain Basins Big Sagebrush Shrubland;
3.2 miles (7 percent) would cross Invasive Annual Grassland; 1.3 miles (3
percent) would cross Invasive Annual and Biennial Forbland; 0.7 miles (1
percent) would cross Inter-Mountains Basins Playa; and 0.5 miles (less than 1
percent) would cross North American Arid West Emergent Marsh (Ormat GIS
2016; SWReGAP GIS 2005).
The gen-tie line is proposed to pass through the northern portion of Dixie
Meadows. Approximately 0.5 miles (2,500 linear feet) of the gen-tie crosses
North American Arid West Emergent Marsh vegetation (Ormat GIS 2016;
SWReGAP GIS 2005). Direct and indirect impacts on this vegetation type would
be of higher consequence due to its limited extent in the Project Area. Impacts
would be avoided, minimized, or mitigated by implementing minimization and
mitigation measures proposed for water resources (see Section 3.3.2) and
wetlands and riparian vegetation (see Section 3.9.2). Environmental protection
measures under the Proposed Action include reclaiming temporarily disturbed
areas to promote the reestablishment of native vegetation. A Reclamation Plan
describing interim and final reclamation would be developed and implemented.
Indirect effects could also result from fugitive dust generated during
construction that settles on vegetation, reducing productivity. Environmental
protection measures include dust control measures during construction to
minimize this effect.
The amount of vegetation type disturbance from wells, power plant(s), and access
roads and pipelines would be the same as described under the Proposed Action.
The gen-tie under Alternative 1 would cross four vegetation types, as follows:
22.7 miles (73 percent) would cross Inter-Mountain Basins Mixed Salt Desert
Scrub; 7 miles (22 percent) would cross Inter-Mountain Basins Greasewood
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-49
3. Affected Environment and Environmental Consequences
Flat; 1.6 miles (5 percent) would cross Invasive Annual and Biennial Forbland;
and less than 0.1 miles (less than 1 percent) would cross Inter-Mountain Basins
Active and Stabilized Dune (Ormat GIS 2016; SWReGAP GIS 2005).
The southern gen-tie line does not traverse Dixie Meadows or North American
arid west emergent marsh vegetation. Direct and indirect impacts on this
vegetation type from construction and maintenance of the southern gen-tie line
are not anticipated.
No Action Alternative
Under the No Action Alternative, the BLM would not approve the project, the
facilities would not be constructed, and ORNI 32 would likely suspend
exploration activities authorized under the two previous Decision Records for
the foreseeable future. As such, there would be no change in existing vegetation
conditions at the site.
Table 18
Typical Wildlife Species Associated with Habitats in the Project Area
Habitat Type1 Associated Species
Inter-Mountain Basins Mixed Salt Pronghorn antelope (Antilocapra americana); coyote (Canis latrans);
Desert Scrub Great Basin pocket mouse (Perognathus parvus); common raven
(Corvus corax); side-blotched lizard (Uta stansburiana)
Inter-Mountain Basins Greasewood Black-tailed jackrabbit (Lepus californicus); white-tailed antelope
Flat squirrel (Ammospermophilus leucurus); black-throated sparrow;
horned lark; desert horned lizard (Phrynosoma platyrhinos)
Invasive Shrubland, Forbland, or Common raven; red-tailed hawk; horned lark; pronghorn
Grassland antelope; collared lizard (Crotaphytus bicinctores)
3-50 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Table 18
Typical Wildlife Species Associated with Habitats in the Project Area
Habitat Type1 Associated Species
Inter-Mountain Basins Big Sage sparrow; Great Basin fence lizard (Sceloporus occidentalis
Sagebrush Shrubland longipes); western kingbird (Tyrannus verticalis)
Inter-Mountain Basins Active and Dune invertebrates including beetles, solitary bees, crickets, ants,
Stabilized Dunes kangaroo rats (Dipodomys deserti)
North American Arid West Yellow-headed blackbird (Xanthocephalus xanthocephalus); marsh
Emergent Marsh wren (Cistothorus palustris); spotted sandpiper (Actitis macularius);
bullfrog (Rana catesbeiana)
Inter-Mountain Basins Playa Pocket gopher (Thomomys bottae); killdeer (Charadrius vociferus);
American avocet; black-necked stilt (Himantopus mexicanus)
Source: EMPSi 2016; NDOW 2012
1
Based on SWReGAP landcover types
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-51
3. Affected Environment and Environmental Consequences
When playas contain water for extended periods of time, lush vegetation can
grow in addition to producing many aquatic invertebrates that provide forage
for shorebirds, waterfowl, and small water birds. Several permanent water
sources drain onto the playa area near the possible power plant locations. The
volume of water discharged from these sources does not provide for complete
inundation of the playa. These water sources and aquatic habitats associated
with them support riparian vegetation. They also provide migratory waterfowl
habitat. These and other amphibians, like the Great Basin spadefoot toad (Spea
intermontana), have been observed in the southern portion of the Dixie Valley
(NASF 2011).
Seasonal inundation of the playa area, generally during spring when snowmelt
runoff is greatest, would provide additional open water habitat for herons,
egrets, bitterns, ducks, geese, and other birds associated with open water.
Marshes are among Nevadas most diverse and prolific wildlife habitats. The
occurrence of marshes on the landscape is critical to both breeding and
migratory needs of many species of birds.
Big Game
The BLM manages habitat for game species. The Stillwater Range in the vicinity
of the Project Area is year-round mule deer (Odocoileus hemionus) and
pronghorn antelope range, and potential elk (Cervus canadensis nelsoni) habitat
(BLM 2015b). Multiple big and small game guzzlers are located to the east and
south of the project.
3-52 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
EMPSi coordinated with NDOW before the 2016 field survey. NDOW
indicated that there are occupied bighorn sheep and pronghorn antelope
distributions in portions of the Project Area and within a 4-mile buffer of the
Project Area. NDOW also reported occupied year-round, crucial summer, and
crucial winter mule deer distribution within the 4-mile buffer area. No occupied
elk habitat exists in the vicinity of the Project Area. No mule deer were
observed in the Project Area; however, an old three-point shed was found
within the 1-mile survey buffer from the southern gen-tie line route (WRC
2013).
Pronghorn antelope was the only big game species that was observed within the
Project Area during field surveys. Antelope was observed in both Dixie Valley
and Jersey Valley during the 2011 and 2016 surveys (EMPSi 2016). A total of
three antelopes were observed in Jersey Valley (the next valley north of Dixie
Valley) in mixed salt desert scrub and invasive grassland habitats in 2011. In
2016, a small herd of antelope, including several juveniles, was observed foraging
on irrigated alfalfa in Dixie Valley. A few additional antelopes were observed in
mixed salt desert scrub. Antelope scat and tracks were also noted throughout
the Project Area.
Other Wildlife
An active kit fox (Vulpes macrotis) burrow complex was recorded in the
northern gen-tie line buffer area in the northern Dixie Valley. No kit foxes were
observed, but recent jackrabbit prey remains and scat were present at the
burrow complex location.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-53
3. Affected Environment and Environmental Consequences
would also disturb these habitats. However, the final locations and, thus, the
exact amount of disturbance in each habitat type are not known at this time.
The proposed gen-tie would cross seven key habitat types, as follows: 26.3 miles
(55 percent) would cross Inter-Mountain Basins Mixed Salt Desert Scrub; 12.6
miles (26 percent) would cross Inter-Mountain Basins Greasewood Flat; 3.5
miles (7 percent) would cross Inter-Mountain Basins Big Sagebrush Shrubland;
3.2 miles (7 percent) would cross Invasive Annual Grassland; 1.3 miles (3
percent) would cross Invasive Annual and Biennial Forbland; 0.7 miles (1
percent) would cross Inter-Mountains Basins Playa; and 0.5 miles (less than 1
percent) would cross North American Arid West Emergent Marsh (Ormat GIS
2016; SWReGAP GIS 2005).
Generally, construction under the Proposed Action would have similar nature
and type of impacts on wildlife as described under Section 3.5, Migratory
Birds. Additional impacts are described below.
3-54 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
as predatory sounds, which may elicit an artificial fight or flight response. The
presence of construction workers, equipment, and noise could cause animals to
avoid the area during construction activities.
Indirect impacts on wildlife and habitat would include potential for increased
weed establishment and spread from soil disturbance during construction.
Weed spread may alter habitat conditions, resulting in less suitable habitat for
wildlife species. Environmental protection measures outlined in Section 2.1.6
would reduce potential for weed establishment and spread, including preparing
an invasive plant management plan prior to construction, reporting noxious
weeds to the BLM, and using weed-free seed in reclamation activities. As a
result, the Proposed Action would have no net increase in the amount of weeds
onsite during the life of the project.
Indirect effects could also result from fugitive dust generated during
construction that settles on vegetation, reducing productivity and degrading
wildlife habitat. Environmental protection measures outlined in Section 2.1.6
include dust control measures during construction to minimize this effect.
The proposed action for the gen-tie line would pass through the northern
portion of Dixie Meadows. Approximately 6,200 linear feet of the gen-tie
crosses North American Arid West Emergent Marsh and Inter-Mountain Basins
Playa, wetland areas as delineated in 2007 on US Navy lands, and wetlands on
BLM-administered lands from the USFWS National Wetland Inventory (Ormat
GIS 2016; SWReGAP GIS 2005; Navy GIS 2016; NWI GIS 2016). The wetlands
and riparian vegetation and open waters associated with seeps and springs and
seasonal ponds in this area provide critical habitat for wildlife species. The
number and diversity of terrestrial and aquatic species that use this area are
likely elevated, compared with other portions of the gen-tie alignment.
Construction of the gen-tie would cause changes in hydrology and functioning of
the wetland or playa habitat that are critical for wildlife. Therefore, the impacts
described above would be higher in the Dixie Meadows area, compared with
other portions of the gen-tie alignment.
The quieter and more consistent background noise associated with power plant
operation could affect animals ability to perceive sounds. This would affect
different species differently, depending on how they use sound and the
frequency of these sounds. Rodents that use chirps to warn of predators may be
susceptible to increased predation, because these chirps may be masked from
the power plant noise (Barber et al. 2009). This, in turn, may affect the
distribution of predators. In effect, noise may create a larger area of habitat
disturbance than the project footprint alone.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-55
3. Affected Environment and Environmental Consequences
Ponds, tanks, and impoundments (including but not limited to drill reserve pits)
containing liquids can present hazards to wildlife (BLM 2008c). Wildlife access to
any liquids contaminated by substances that may be harmful due to toxicity,
fouling of the fur (detergents and oils), or excessive temperatures would be
excluded by wildlife proof-fencing, netting, or other covering at all times when
not in active use. Clean water impoundments can also present a trapping hazard
if they are steep-sided or lined with smooth material. To avoid impacts, any pits
that present a wildlife trapping hazard would be fitted or constructed with an
escape ramp. These measures would conform to Appendix D, Best Management
Practices Mitigation Measures, of the BLMs 2008 geothermal leasing PEIS (see
Appendix F of this EA) and NDOWs Geothermal Sump Guidelines (NDOW,
no date).
The amount of key habitat disturbance from wells, power plant(s), and access
roads and pipelines would be the same as described under the Proposed Action.
The gen-tie under Alternative 1 would cross four key habitat types, as follows:
22.7 miles (73 percent) would cross Inter-Mountain Basins Mixed Salt Desert
Scrub; 7 miles (22 percent) would cross Inter-Mountain Basins Greasewood
3-56 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Flat; 1.6 miles (5 percent) would cross Invasive Annual and Biennial Forbland;
and less than 0.1 miles (less than 1 percent) would cross Inter-Mountain Basins
Active and Stabilized Dune (Ormat GIS 2016; SWReGAP GIS 2005).
The southern gen-tie route would not impact the Dixie Meadows or any other
seeps, springs, wetland, or riparian vegetation. Because this alternative does not
include gen-tie construction or operation in wetland or riparian areas, direct
and indirect impacts on wildlife habitat during critical breeding and migration
periods would likely be substantially reduced, compared with the Proposed
Action.
No Action Alternative
Under the No Action Alternative, the BLM would not approve the project, the
facilities would not be constructed, and ORNI 32 would likely suspend
exploration activities authorized under the two previous Decision Records for
the foreseeable future. As such, there would be no change in existing wildlife
habitat or vegetation conditions at the site.
The objectives of the BLM sensitive species policy are twofold, as follows:
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-57
3. Affected Environment and Environmental Consequences
The Bald and Golden Eagle Protection Act (1940 as amended 1959, 1962, 1972,
1978; BGEPA) prohibits the take or possession of bald and golden eagles with
limited exceptions. Take, as defined in the BGEPA, includes to pursue, shoot,
shoot at, poison, wound, kill, capture, trap, collect, molest or disturb. Disturb
means to agitate or bother a bald or golden eagle to a degree that causes or is
likely to cause, based on the best scientific information available, (1) injury to an
eagle, (2) a decrease in its productivity, by substantially interfering with normal
breeding, feeding or sheltering behavior, or (3) nest abandonment, by
substantially interfering with normal breeding, feeding or sheltering behavior.
Important eagle-use area is defined in the BGEPA as an eagle nest, foraging area,
or communal roost site that eagles rely on for breeding, sheltering, or feeding,
and the landscape features surrounding such nest, foraging area, or roost site
are essential for the continued viability of the site for breeding, feeding, or
sheltering eagles. The BLM requires consideration and NEPA analysis of golden
eagles and their habitat for all renewable energy projects (BLM Instruction
Memorandum No. 2010-156).
3-58 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Table 19
BLM Sensitive Species
Observed or Potentially Occurring in the Project Area
Species Habitat Potential for Occurrence
Plants
Sodaville milkvetch Moist, open, alkaline hummocks and Potential habitat present;
A. lentiginosus var. drainages near cool springs not observed during surveys
sesquimetralis
Tonopah milkvetch Deep loose sandy soils of stabilized and Potential habitat present;
A. pseudiodanthus active dune margins, old beaches, valley not observed during surveys
floors, or drainages, in salt desert shrub
Sand cholla Sand of dunes, dry-lake borders, river One observed in mixed salt
Grusonia pulchella bottoms, washes, valleys, and plains on desert scrub habitat along
sandy soils northern gen-tie alignment.
Sagebrush pygmyleaf Fine, deep, often granitic, sandy soils of Potential habitat present;
Leoflingia squarrosa ssp. valley flats and dunes in the sagebrush and not observed during surveys
aretemisiarum possibly mixed-shrub zones, usually in
openings among sagebrush
Tiehm blazingstar White, alkaline, clay badlands and flats Potential habitat present;
Mentzelia tiehmii not observed during surveys
Oryctes Deep, loose sand of stabilized dunes, Potential habitat present;
Oryctes nevadensis washes, and valley flats, on various slopes not observed during surveys
and aspects; appears only in years with
optimal rainfall and temperature patterns
Nevada dune Deep, volcanic, sandy soils; common Potential habitat present;
beardtongue associates include fourwing saltbush, littleleaf not observed during surveys.
Penstemon arenarius horsebrush, and greasewood
Lahontan beardtongue Along washes, roadsides, and canyon floors, Potential habitat present;
P. palmeri var. macranthus particularly on carbonate-containing not observed during surveys
substrates, usually where subsurface
moisture is available throughout most of the
summer
Playa phacelia Grows in alkali playas and seasonally Potential habitat present;
P. inundata inundated areas with clay soils not observed during surveys
Invertebrates
Carson valley wood Wet meadows Potential to occur
nymph
Cercyonis pegala
carsonensis
Pallid wood nymph Alkaline flats Potential to occur
C. oetus pallescens
Dixie Valley pyrg Spring habitats in the Dixie Valley Documented in the Dixie
Pyrgulopsis dixensis Meadows springs
Carson Valley silverspot Permanent spring-fed meadows, seeps, No violet species observed
Speyeria nokomis marshes, and boggy, streamside meadows in the study area; suitable
carsonensis associated with flowing water; with adequate habitat may be present in
supply of the larval food plant (bog violet Dixie Meadows
[Viola nephrophylla])
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-59
3. Affected Environment and Environmental Consequences
Table 19
BLM Sensitive Species
Observed or Potentially Occurring in the Project Area
Species Habitat Potential for Occurrence
Amphibians
Dixie Valley toad Springs, seeps, streams, and similar wet Documented in the Dixie
Anaxyrus boreas areas. Endemic to Dixie Valley Meadows springs
Northern leopard frog Springs, slow streams, marshes, bogs, ponds, Observed in Dixie Meadows
Rana pipiens floodplains, reservoirs, and lakes; usually springs during 2009 surveys
permanent water with rooted aquatic
vegetation
Birds
Burrowing owl Treeless areas with low vegetation and Potential to occur; detected
Athene cunicularia burrows within 1 mile of survey area
Golden eagle Variety of open and semi-open landscapes, Confirmed; several nests
Aquila chrysaetos with sufficient mammalian prey base and cliff observed in the surrounding
sites for nesting mountains
Ferruginous hawk Grasslands and semi-desert shrublands; Potential to occur
Buteo regalis nests in isolated trees, on rock outcrops, or
on the ground
Swainsons hawk Usually occurs close to riparian or other Potential to occur
B. swainsoni wet habitats; forages over agricultural fields,
wet meadows, or open shrublands
Greater sage-grouse Foothills, plains, and mountain slopes where Northern gen-tie alignment
Centrocercus urophasianus sagebrush is present, often with a mixture of traverses approximately 2.65
sagebrush and meadows close by miles of OHMA; NDOW
identified three pending leks
in the vicinity of the Project
Area: the Fish Creek Basin
2, 5, and 6 leks. The nearest
lek is on private land
approximately 3.8 miles
from the northern gen-tie
alignment in Jersey Valley;
the other leks are on BLM-
administered lands
approximately 4.5 and 5
miles from the northern
gen-tie alignment in Jersey
Valley.
Western snowy plover Alkali flat, mudflat, or flat beach next to Potential to occur.
Charadrius alexandrinus permanent or seasonal surface water Observed within Dixie
nivosus Meadows during 2009
surveys
3-60 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Table 19
BLM Sensitive Species
Observed or Potentially Occurring in the Project Area
Species Habitat Potential for Occurrence
Peregrine falcon Nests on ledge or hole on face of rocky cliff Potential to occur; suitable
F. peregrinus or crag; forages over various open habitats foraging habitat present;
suitable nesting habitat
present in adjacent mountain
ranges. Staff at NAS Fallon
have observed this species in
the Dixie Valley Settlement
Area.
Bald eagle Nests in tall trees near bodies of water that No suitable nesting habitat
Haliaeetus leucocephalus support primary food sources: fish, present, potential to winter
waterfowl, and seabirds. Wintering areas are in the Project Area. No bald
commonly associated with open water eagle nests have been
though in some regions (e.g., Great Basin), documented within 10 miles
some bald eagles use habitats with little or of the Project Area (WRC
no open water (e.g., montane areas) if 2013).
upland food resources (e.g. rabbit or deer
carrion and livestock afterbirths) are readily
available.
Loggerhead shrike Open country, with scattered trees and Observed along the
Lanius ludovicianus shrubs, desert scrub; nests in shrubs or northern gen-tie route
small trees
Sage thrasher Breeds in arid or semiarid sagebrush plains; Potential to occur
Oreoscoptes montanus in winter, uses arid and semiarid scrub,
brush, and thickets
Brewers sparrow Strongly associated with sagebrush, in areas Potential to occur
Spizella breweri with scattered shrubs and short grass; in
migration and winter, uses low, arid
vegetation, desert scrub, sagebrush, and
creosote bush
Mammals
Pallid bat Arid deserts and grasslands, often near Maternity and hibernation
Antrozous pallidus rocky outcrops and water roost in Jersey Valley,
approximately 3,000 feet
(0.6 miles) from northern
gen-tie route. Potential
foraging habitat;
documented by NDOW in
project vicinity; documented
in Dixie Meadows during
acoustic surveys
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-61
3. Affected Environment and Environmental Consequences
Table 19
BLM Sensitive Species
Observed or Potentially Occurring in the Project Area
Species Habitat Potential for Occurrence
Townsends big-eared bat Maternity and hibernation colonies typically Maternity roost in Jersey
Corynorhinus townsendii in caves and mine tunnels Valley, approximately 3,000
feet (0.6 miles) from
northern gen-tie route.
Potential foraging habitat;
documented by NDOW in
project vicinity
Big brown bat Various wooded and semi-open habitats, Foraging habitat present
Eptesicus fuscus including in cities
Spotted bat Various habitats, from desert to montane, Foraging habitat present
Euderma maculatum including canyon bottoms, and open
pastures
Silver-haired bat Prefers forested areas next to lakes, ponds, Foraging habitat present;
Lasionycteris noctivagans and streams documented in Dixie
Meadows during acoustic
surveys
Western red bat Riparian habitats in forests and woodlands, Foraging habitat present
Lasiurus blossevillii from lowlands up through mixed conifer
forests of mountains; foraging habitat
includes grasslands, shrublands, open
woodlands and forests, and croplands
Hoary bat Prefers deciduous and coniferous forests Foraging habitat present;
L. cinereus and woodlands documented in Dixie
Meadows during acoustic
surveys
Small-footed myotis Desert, badland, and semiarid habitats Foraging habitat present;
Myotis ciliolabrum documented by NDOW in
project vicinity; documented
in Dixie Meadows during
acoustic surveys
California myotis Western lowlands; canyons, riparian Foraging habitat present;
M. californicus woodlands, desert scrub, and grasslands documented in Dixie
Meadows during acoustic
surveys
Long-eared myotis Mostly forested areas; also shrubland, along Foraging habitat present;
M. evotis wooded streams, over reservoirs documented by NDOW in
project vicinity
Little brown myotis Adapted to using human-made structures; Foraging habitat present
M. lucifugus also uses caves and hollow trees
Fringed myotis Desert, grassland, and wooded habitats Foraging habitat present
M. thysanodes
Long-legged myotis Primarily in montane coniferous forests; also Foraging habitat present;
M. volans in riparian and desert habitats documented on US Navy
lands near the Dixie Valley
Settlement Area
3-62 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Table 19
BLM Sensitive Species
Observed or Potentially Occurring in the Project Area
Species Habitat Potential for Occurrence
Yuma myotis Wide variety of upland and lowland habitats, Foraging habitat present;
M. yumanensis including riparian, desert scrub, moist documented by NDOW in
woodlands, and forests, usually near open project vicinity; documented
water in Dixie Meadows during
acoustic surveys
Brazilian free-tailed bat Roosts primarily in caves Foraging habitat present;
Tadarida brasiliensis documented in Dixie
Meadows during acoustic
surveys
Western pipistrelle bat Deserts and lowlands, desert mountain Foraging habitat present;
Pipistrellus hesperus ranges, desert scrub flats, and rocky canyons documented by NDOW in
project vicinity; documented
in Dixie Meadows during
acoustic surveys
Pygmy rabbit Occurs throughout much of the Great Basin No pygmy rabbits, burrows,
Brachylagus idahoensis in areas of tall, dense sagebrush (Artemisia scat, or tracks were
spp.) or mixed sagebrush habitats. Pygmy observed during surveys. No
rabbit burrows are typically found in suitable habitat present in
relatively deep, loose soils of wind- or the Project Area. Pygmy
water-born origin suitable for burrowing. rabbit has been observed in
suitable habitat in the vicinity
of the Project Area.1
Dark kangaroo mouse In loose sands and gravel; found in shadscale Potential to occur
Microdipodops scrub, sagebrush scrub, and alkali sink plant
megacephalus communities
Pale kangaroo mouse Restricted to fine sands in alkali sink and Potential to occur, especially
M. pallidus desert scrub dominated by shadscale or big along southern gen-tie
sagebrush; often burrows in areas of soft, ROW
windblown sand, piled at the bases of shrubs
Desert bighorn sheep Steep slopes on or near mountains, with a Suitable habitat in the
Ovis canadensis nelsoni clear view of surrounding area Stillwater Range, next to
Dixie Valley; no suitable
habitat in the Project Area
Sources: EMPSi 2016; NNHP 2016; NDOW 2016
1
Email from Angelica Rose, BLM, to Drew Vankat, EMPSi, on September 2, 2016, regarding Dixie Meadows
Comments
Plants
EMPSi biologists surveyed the Project Area and a 250-foot buffer for sensitive
plant species in May 2011; in June 2016, they surveyed additional portions of the
Project Area not covered by the 2011 surveys due to gen-tie alignment
modifications. A full description of survey method and agency coordination is in
the Biological Survey Report (EMPSi 2016; see Appendix D).
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-63
3. Affected Environment and Environmental Consequences
One BLM sensitive plant species was observed in the survey area in 2016, a sand
cholla (Grusonia pulchella) growing in mixed salt desert scrub, along the
proposed transmission alignment in the northern Dixie Valley (see Figure 4 in
EMPSi 2016). Soils at the site are somewhat alkaline sandy silts, with a
moderately high biological crust cover, indicating marginal habitat for this
species. The plant was not blooming, despite surveys being conducted during
the blooming period, as indicated by the NNHP. No withered flowers or fruit
were observed on the plant, indicating that it may not have bloomed in 2016.
Additional species that have not been observed in the Project Area vicinity but
that have potential to occur in the Project Area based on presence of
potentially suitable habitat are discussed below.
3-64 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Playa phacelia (Phacelia inundata) is an annual herb in the waterleaf family that
grows in alkali playas and seasonally inundated areas with clay soils (NNHP
2001). Potential habitat for this species occurs in the Dixie Meadows and on
other playa areas in the Dixie Valley.
All cactus species are protected by Nevada statute. At two sites, fragmentary
dried remains of Plains beavertail cactus (Opuntia polyacantha) were found: one
plant site was evidenced by a small pile of long spines; the other was evidenced
by a fragment of the distinctive perforated wood that is formed by species in the
genus Opuntia. Based on the appearance of dead plants of beavertail observed
elsewhere, these plants likely died at least 2 years ago and probably much longer
(ESRS 2013). No cactus species besides the single sand cholla individual
discussed above were observed in the northern gen-tie alignment route.
Invertebrates
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-65
3. Affected Environment and Environmental Consequences
these snails are essentially immobile and do not venture far from their place of
birth. Springs and seeps comprising potentially suitable habitat for Dixie Valley
pyrg is depicted in Figure 6, Surface Water.
Additional BLM Sensitive invertebrate species could potentially occur within the
Project Area based on literature reviews and habitat assessment. Little
published literature is available regarding the ecology of some of these species,
which makes the likelihood of occurrence determination uncertain. Additionally,
some of the species are known only from specific locations, such as isolated
springs or dune habitats, lessening the likelihood of their occurrence in the
Project Area.
Amphibians
3-66 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
wet meadows and fields. The species takes cover underwater, in damp niches,
or in caves when inactive. Habitat degradation, fragmentation, and loss due to
unsustainable grazing, water impoundments or other alterations, and
development are the main threats to this species. Interactions with introduced
species may also be contributing to declines. Inadequate information exists to
adequately characterize current distribution and status/trend of individual
isolated sub-populations (Wildlife Action Plan Team 2012).
Northern leopard frog could occur in the emergent marsh habitat in Dixie
Meadows, where suitable habitat for this species is present. The species was
reportedly observed during the 2009 biological survey in Dixie Meadows (see
Appendix D) but was not observed during surveys in the Project Area in 2011
or 2016, though suitable habitat was present in the survey area.
NDOW has not recorded northern leopard frog in Dixie Meadows (WRC
2013).
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-67
3. Affected Environment and Environmental Consequences
approximately 200 toads to assist with monitoring the population size in Dixie
Meadows.5
The Dixie Valley toad faces several potential threats stemming from its extremely
limited distribution. Habitat modification from climate change (USFWS 2009, in
Forrest et al. 2013) could reduce essential breeding habitat. Geothermal energy
development in the Dixie Valley could alter water quality or quantity in its habitat
(Forrest et al. 2013).
In 2011 and 2012, Dixie Valley toads and other nearby amphibian populations of
western toads and American bullfrogs were tested for Bd. None of the Dixie
Meadows or western toads sampled were positive for Bd. However, the
prevalence of Bd infections among the nearby Turley Pond population of
American bullfrogs increased significantly between samplings in 2011 and 2012.
American bullfrogs are a known vector for Bd; the high incidence of the fungus
among this nearby population of bullfrogs in Dixie Valley may represent a
serious threat to Dixie Valley toads (Forrest et al. 2013).
Birds
Greater Sage-Grouse
Greater sage-grouse use a wide variety of sagebrush mosaic habitats with
meadows and aspen (Populus spp.) in close proximity. This species roosts in
sagebrush and also uses seeps, wet meadows, riparian areas, alfalfa fields, potato
fields, and other cultivated and irrigated areas. Leks are located on relatively
open sites surrounded by sagebrush, or in areas where sagebrush density is low,
such as exposed ridges, knolls, or grassy swales (Schroeder et al. 1999). Nests
are located in thick cover in sagebrush habitat and consist of a shallow
depression on the ground.
The most significant threats to greater sage-grouse in Nevada are natural system
modifications due to wildfire and the subsequent loss of habitat combined with
impacts of invasive species (e.g., cheatgrass) and problematic native species
encroachment (e.g., pinyon-juniper woodlands). Habitat fragmentation and
disturbance is also a threat, particularly from roads and utility service lines as a
result of both renewable and nonrenewable energy resources. Habitat
degradation caused by improper grazing, recreational activities, and loss of
upland meadows to mining are also threats (Wildlife Action Plan Team 2012).
In a letter dated May 29, 2013, NDOW stated that there are no known greater
sage-grouse lek sites in the vicinity of the Project Area, and that greater sage-
5
Kris Urquhart, NDOW, discussions with Melanie Cota, BLM, in 2016, regarding Dixie Valley toad.
3-68 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Golden Eagle
Golden eagles are generally found in open country, prairies, arctic and alpine
tundra, open wooded country, and barren areas, especially in hilly or
mountainous regions. In Nevada, they nest predominantly on rock ledges on
cliffs and occasionally in large trees. Pairs may have several alternate nests and
may use the same nest in consecutive years or shift to an alternate nest in
different years. The species is vulnerable to reduction of prey populations due
to degradation or loss of rangelands to development, wind turbine collisions,
and potential disturbance causing nest abandonment (Wildlife Action Plan Team
2012).
Aerial surveys for golden eagle were conducted within 4 miles of the
geothermal lease areas and northern gen-tie line route in 2011 (EMPSi 2016).
Survey buffers were determined following USFWS guidance for similar
geothermal utilization projects in the Coyote Canyon and New York Valley
6
Mark Freese, NDOW, e-mail to Morgan Trieger, EMPSi, on October 6, 2016, regarding greater sage-grouse
NDOW data request response - additional leks.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-69
3. Affected Environment and Environmental Consequences
Geothermal Resource Areas7 and were approved by the BLM.8 Golden eagle
aerial surveys were conducted using the protocols outlined in the Interim
Golden Eagle technical guidance (Pagel et al. 2010) and were conducted via a
Bell 206L-4 helicopter. Surveys were conducted on June 27 and 28, 2011. Nine
active confirmed golden eagle nests (5 of which were occupied at the time of
the survey) and 16 inactive nests were recorded within 4 miles of the
geothermal lease area and northern gen-tie line route. All nests were located in
rock outcrops and on cliff faces in the ranges adjacent to Dixie Valley and Jersey
Valley. Nest locations are shown on Figure 8, Raptor Nests.
The nearest active nest from the 2011 survey to any project component is
located approximately 5,700 feet (1.1 miles) northwest of the geothermal lease
boundary; this nest is located approximately 7,400 feet (1.4 miles) away from
the proposed gen-tie. The nearest inactive nest from the 2011 survey is located
6,050 feet (1.2 miles) from the geothermal lease boundary and approximately
8,300 feet (1.6 miles) from the northern gen-tie (Ormat GIS 2016).
In addition, five adult golden eagles, five young-in-nest eagles, and one fledgling
were observed during the aerial golden eagle survey. Additional details on
observations are provided in the biological survey report (EMPSi 2016). Several
other raptors were also incidentally observed. These include prairie falcon,
turkey vulture, red-tailed hawk, ferruginous hawk (probable), and American
kestrel. Surveyors noted that one observed inactive nest could have been a
prairie falcon nest.
Ground surveys for golden eagle were conducted within the geothermal lease
areas and the southern gen-tie line route and within a 1-mile buffer of this route
between June and August 2013 (WRC 2013). Per consultation with NDOW,
eight golden eagle nests occurred within 10 miles of the southern gen-tie route
(WRC 2013). The NDOW provided an Excel table of UTM coordinates for
these nest locations. Coordinates were plotted, and all nests within the 1-mile
buffer were assessed for active or inactive status during the field surveys. One
active nest was observed within the 1-mile buffer in the Louderback Mountains,
approximately 4,940 feet (0.9 miles) from the southern gen-tie line, and an
additional active nest is located approximately 500 feet outside of the 1-mile
buffer in the Stillwater Range (this nest was also active in 2011 and is located
5,700 feet [1.1 miles] northwest of the geothermal lease boundary; this nest is
located approximately 7,400 feet [1.4 miles] away from the proposed gen-tie as
described above).
7
Steve Abele, USFWS, e-mail to Sue Fox, WRC, on November 17, 2010, regarding on the goea again.
8
John Wilson, BLM, e-mail to Meredith Zaccherio, EMPSi, on June 6, 2011, regarding Dixie Hope golden eagle
survey.
3-70 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-71
3. Affected Environment and Environmental Consequences
Although NDOW identified an additional golden eagle nest within the 1-mile
buffer, this nest could not be located and suitable nesting habitat at the provided
location is not present (WRC 2013). In addition, one adult golden eagle was
observed perched on an existing wooden power line pole in the southern
portion of the southern gen-tie alignment.
Ground surveys for golden eagle were also conducted within the geothermal
lease areas and portions of the northern gen-tie line route and within a 1-mile
buffer of these areas in June 2016 (EMPSi 2016). No golden eagles or nests were
observed during the 2016 ground survey.
In summary, the nearest active nest observed during all surveys to any project
component is approximately 4,940 feet (0.9 miles); this nest is located in the
Louderback Mountains east of the southern gen-tie route. The nearest active
nest to the lease areas and northern gen-tie route is located approximately
5,700 feet (1.1 miles) northwest of the geothermal lease boundary; this nest is
located approximately 7,400 feet (1.4 miles) away from the northern gen-tie.
The nearest inactive nest is approximately 6,050 feet (1.2 miles) from the
geothermal lease boundary and approximately 8,300 feet (1.6 miles) from the
northern gen-tie (Ormat GIS 2016).
Foraging habitat for golden eagles is present throughout the Project Area.
Ferruginous Hawk
Ferruginous hawk habitat includes open country, sagebrush, saltbush-
greasewood shrubland, and the periphery of pinyon-juniper and other woodland
and desert communities. In Nevada, ferruginous hawks nest primarily in live
juniper trees, occasionally on tufa stacks and rock outcrops, sometimes on
power line towers, and rarely on the ground (Wildlife Action Plan Team 2012).
Suitable foraging and nesting habitat is present in the Project Area.
Swainsons Hawk
Swainsons hawk forages in savanna, open pine-oak woodland, and cultivated
lands (e.g., alfalfa and other hay crops, and certain grain and row croplands) with
scattered trees, usually near riparian areas. It nests typically in a solitary tree,
bush, or small grove; sometimes it nests on rock ledges. Suitable foraging and
nesting habitat is present in the Project Area.
Burrowing Owl
Burrowing owl optimum habitat is typified by short vegetation and the presence
of recent, small mammal burrows. This species is found in open grasslands,
sagebrush, and sagebrush-steppe, and sometimes in open areas such as vacant
lots near human habitation. In Nevada, burrowing owl is vulnerable to habitat
loss and fragmentation primarily due to urban land conversion, and habitat
degradation from control and extermination of colonial burrowing mammals. It
is also vulnerable to vehicle collisions, predators, disturbance, harassment by
3-72 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Burrowing owls and their active burrows were observed in three locations
during the 2011 surveys within one-half mile of the northern gen-tie line; no
burrowing owls were observed at these locations in 2016 (see Figure 4 in EMPSi
2016). In 2011, the entrance to burrow 1 had scat and a few pellets. An owl was
perched at the burrow, and a second owl flew east from this location. As such,
it is likely there is a pair nesting at this site. Burrow 2 is lined with cow scat and
had no pellets, scat, white-wash, or feathers. It is adjacent to the main dirt road
and is east of burrow 1. A single owl was observed perched on the dirt mound
at burrow 3. Fresh pellets, scat, and white-wash were noted at the burrow
entrance.
Burrowing owls can form loose nesting colonies, and it is possible there is a
colony of burrowing owls in this area. Colonies often form where colonial
ground squirrels are present due to the abundance of holes. However, the three
burrows observed during the field survey were likely dug by badgers based on
their shape, dimensions, and old nail marks on the side walls.
Inactive burrowing owl burrows were observed during surveys in 2016, but no
owls were observed. Inactive burrows exhibited signs of past use by burrowing
owls, including old pellets. No feathers or whitewash were observed at the
burrows, and cobwebs and vegetation were partially covering burrow entrances
(see Figure 4 in EMPSi 2016).
Burrowing owl point count surveys were conducted along the southern gen-tie
alignment and within the lease areas on July 7 and 8, 2013 (WRC 2013). The
survey tiered off Conway and Simon (2003). Additionally, meandering transects
were walked throughout the southern gen-tie alignment and lease areas;
biologists focused on burrowing owl and their sign during these transects. No
burrowing owls or their sign (e.g., burrows, pellets, feathers, tracks, white-wash,
or insect parts on dirt mounds) were observed; no burrowing owls were
detected during the broadcast surveys. Potentially suitable foraging and nesting
habitat is present throughout the southern gen-tie alignment, although the
northernmost portions that are densely vegetated with greasewood are less
likely to be occupied by burrowing owls. Borrowing owls were observed near
the southern gen-tie in the Dixie Settlement area, and NDOW has a 1987
record for burrowing owls approximately 2.3 miles southwest of the southwest
portion of the southern gen-tie alignment. This location is characterized as
grasslands with sparse shrubs (WRC 2013).
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-73
3. Affected Environment and Environmental Consequences
Peregrine Falcon
Peregrine falcons forage in various open environments, including open water,
desert shrub, and marshes, usually in close association with suitable nesting cliffs.
When not breeding, they occur in areas where prey concentrate, including
marshes, lake shores, rivers and river valleys, cities, and airports. In Nevada,
Peregrine falcons often nest on a ledge or in a hole on the face of a rocky cliff or
crag (Wildlife Action Plan Team 2012). Suitable foraging habitat is present in the
Project Area; suitable nesting habitat is present in adjacent mountain ranges.
Staff at NAS Fallon have observed this species in the Dixie Valley Settlement
Area.
Bald Eagle
Bald eagle usually nests in tall trees or on cliffs near bodies of water that provide
a food base. Nests located on cliffs and rock pinnacles also have been reported
historically in Nevada. Bald eagle winters throughout Nevada; winter
distribution is influenced by waterfowl concentrations or bodies of water
(Wildlife Action Plan Team 2012). There is no suitable nesting habitat present in
the Project Area, though potential wintering habitat may be present. No bald
eagle nests have been documented within 10 miles of the Project Area (WRC
2013).
Loggerhead Shrike
Loggerhead shrikes breed in open country with scattered trees and shrubs,
savanna, desert scrub, and, occasionally, open woodland. They often perch on
poles, wires, or fence posts, and suitable hunting perches are an important part
of the habitat (Yosef and Grubb 1994). Loggerhead shrikes nest in shrubs or
small trees (Wildlife Action Plan Team 2012). Several foraging loggerhead
shrikes were observed during the 2016 surveys along the northern gen-tie
alignment. No active or inactive nests were observed in the vicinity of the
observations (see Figure 4 in EMPSi 2016).
Sage Thrasher
In the northern Great Basin, sage thrasher breeds and forages in tall sagebrush,
sagebrush/juniper, mountain mahogany, and sagebrush/aspen communities
(Maser et al. 1984). This species generally nests in sagebrush shrubs, in a branch
fork near the ground. In winter, it uses arid and semi-arid scrub, brush, and
thickets (Wildlife Action Plan Team 2012). Sage thrasher may use sagebrush
habitat in the Project Area. It was not observed during the 2016 surveys.
3-74 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Brewers Sparrow
Brewers sparrow is strongly associated with sagebrush, where it nests low in
sagebrush shrubs (Wildlife Action Plan Team 2012). Brewers sparrow may use
sagebrush habitat in the Project Area. It was not observed during the 2016
surveys.
Mammals
Bats
Foraging habitat exists throughout the Project Area for the BLM Sensitive bat
species. Numerous species of bats have been acoustically detected in the Dixie
Meadows area, as described below.
The primary structural bat roosting habitat in the immediate vicinity of project
components is the wooden power poles associated with the existing
transmission line. Bats could potentially roost in these power poles if
woodpecker holes are present. While not all power poles were surveyed, those
that were scanned did not have any cavities. Moreover, no evidence of decay or
rotting in the power poles, which could produce flaking or locations where bats
could roost, was noted. It is likely that these poles are carefully maintained and
if they began to decay, they would be replaced. Thus, although bats could forage
over the shrubs found in the mixed salt desert scrub and greasewood habitats,
the plants in this habitat type do not provide suitable long-term night and day
roosting sites.
Bat acoustic detectors were deployed over two nights from July 7 to 8, 2013.
Detectors were placed at several locations in Dixie Meadows within and east of
the lease areas and near the southern end of the southern gen-tie alignment, as
shown in WRC (2013). In the meadows, the detectors were placed along the
periphery of the meadow near trees such as tamarisk and Russian olive, and
near open water in channels and small ponds. Several bat species were detected
in the Dixie Meadows locations; species detected were Brazilian free-tailed bat,
California myotis, small-footed myotis, and western pipistrelle. No bats were
detected in the lease areas or at the southern gen-tie detector locations (WRC
2013).
Suitable roosting habitat for bats is likely present outside the Project Area,
within live and dead trees surrounding ponds in Dixie Meadows, within rock
outcrops and abandoned mine workings in the adjacent Stillwater Range and
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-75
3. Affected Environment and Environmental Consequences
Louderback Mountains, and within the Dixie Valley Settlement Area east of the
southern gen-tie line route in mature trees and old buildings (WRC 2013; EMPSi
2016).
Eight species of bats were recorded at Dixie Meadows during acoustic surveys
performed in April and May 2007, according to the Ecological Inventory Update
Naval Air Station Fallon Nevada August 2008. Besides the four species recorded
during 2013 surveys, pallid bat, silver-haired bat, hoary bat, and Yuma myotis
were also recorded (WRC 2013). In addition, the 2014 Final Integrated Natural
Resource Management Plan and Environmental Assessment Naval Air Station
Fallon, Nevada (NASF 2014) cites a 1997 ecological inventory that found long-
legged myotis in old buildings in the Dixie Valley Settlement Pond Area.
NDOW has documented several bat species near the Project Area. Species
documented are pallid bat, Townsends big-eared bat, California myotis, long-
eared myotis, small-footed myotis, long-legged myotis, Yuma myotis, and
western pipistrelle (NDOW 2016).
The NDOW also indicated that pallid bat and Townsends big-eared bat
maternity and hibernation roosts are present in Jersey Valley, near the northern
gen-tie line.9 Roosts are present in abandoned mine lands, less than 500 feet
from Ormats Jersey Valley Geothermal Power Plant, at the terminus of the
proposed northern gen-tie alignment. Several of the abandoned mine lands in
this area have been gated to prevent human entry while allowing for bat use, but
additional compatible closures are needed to protect maternity roosts.
Foraging habitat is present in the Project Area for big brown bat, spotted bat,
western red bat, little brown myotis, and fringed myotis. However, these
species have not been documented in or near the Project Area.
Pygmy rabbit
Pygmy rabbits are found primarily on big sagebrush dominated plain and alluvial
fans where plants occur in tall, dense clumps (Green and Flinders 1980). Deep,
friable, loamy-type soils are required for burrow excavation. They may
occasionally use burrows excavated by other species (e.g., yellow-bellied
marmot). Therefore, they may occur in areas that support shallower, more
compact soils as long as sufficient shrub cover is available (USFWS 2010).
9
Jenni Jeffers, NDOW, phone call with Morgan Trieger, EMPSi, on October 7, 2016, regarding biological
resources.
3-76 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Threats include livestock grazing, wildfire, invasive species, and climate change
(Wildlife Action Plan Team 2012). No pygmy rabbits, burrows, scat, or tracks
were observed during the surveys. There is no suitable habitat in the Project
Area. However, pygmy rabbits have been observed in suitable habitat in the
vicinity of the Project Area in the Jersey Valley.
Kangaroo mice
Both pale and dark kangaroo mice are BLM sensitive species and Nevada
protected mammals (NAC 503.030). These animals are associated with
intermountain (cold desert) scrub habitat, which is the most common habitat
type in the Project Area. In this habitat type, both species are found in
shadscale, sagebrush, and alkali sink plant communities, which are present in the
Project Area.
Both species are strongly associated with sandy soils. The pale kangaroo mouse
may be more ecologically specialized than the dark kangaroo mouse (Hafner et
al. 2008). It is typically restricted to deep, sandy soils with little or no gravel,
usually below the sagebrush zone. The dark kangaroo mouse, on the other
hand, is tolerant of a wide range of sandy substrates and vegetation associations.
Field surveys in the geothermal plant area and southern gen-tie ROW (WRC
2013) suggest that small-scale surface deposits of sand, indicative of pale
kangaroo mouse habitat, were common in the southern portion of the southern
gen-tie route. Also, there is a record from 1950 of the pale kangaroo mouse. It
was recorded on US Navy lands southwest of the Project Area, in the US Naval
Electronic Warfare Training Area. Thus, the pale kangaroo mouse has the
potential to occur, particularly in the southern portion of the Project Area. The
dark kangaroo mouse, with more general habitat preferences, also has the
potential to occur there.
Small mammals were not trapped in the Project Area as part of project surveys.
Burrows typical of kangaroo rats (Dipodomys ssp.) were noted throughout the
southern gen-tie route. One Heteromyidae rodent (an unidentified species of
kangaroo rat) was observed during the field survey (WRC 2013).
Bighorn sheep
Bighorn sheep occur in alpine to desert grasslands or shrub-steppe in
mountains, foothills, or river canyons. Escape terrain (e.g., cliffs and talus slopes)
is an important habitat feature (Wildlife Action Plan Team 2012). Bighorn sheep
have been recorded in the Stillwater Range (EMPSi 2016), to the west of the
Project Area. Suitable breeding habitat is limited to the higher, rocky portions of
the adjacent ranges. However, the species may use portions of the Project Area
for foraging or for access to water. Bighorn sheep could also use the Project
Area if they were to disperse to the Clan Alpine Mountains on the east side of
Dixie Valley, which is also occupied bighorn sheep habitat.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-77
3. Affected Environment and Environmental Consequences
Plants
Direct impacts on the BLM sensitive plant species sand cholla could occur
during construction of the northern gen-tie line. Direct impacts could come
from crushing, uprooting, or injuring the plant, potentially resulting in mortality
or reduced reproductive success. Indirect impacts could occur if excessive dust
mobilized during construction were to settle on the plant. This could suppress
physiological processes or pollinator success.
Botanical surveys in the Project Area have not recorded any other BLM
sensitive plant species, although potential habitat exists for eight other BLM
Sensitive plant species in and near the Project Area. These species are:
Sodaville milkvetch
Tonopah milkvetch
Sagebrush pygmyleaf
Tiehm blazingstar
Oryctes
Nevada dune beardtongue
Lahontan beardtongue, and
Playa phacelia
3-78 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
appropriate mitigation required for no net loss of the species. All natural
processes that create and maintain sensitive species habitat shall be protected
and preserved.
Invertebrates
Suitable habitat for sensitive butterflies, including the Carson Valley wood
nymph, pallid wood nymph, and Carson Valley silverspot, may be present in
Dixie Meadows. Constructing the northern gen-tie route through a portion of
the northern Dixie Meadows may crush individual butterflies on host vegetation
in the construction area. Impacts would be most likely if they were to occur
during one of the species non-adult life phases, when it would be relatively
immobile. If construction were to occur during the flight stage of these species,
the individuals would likely disperse from the area into nearby suitable habitat.
Potential impacts would be minimized by using existing routes for construction
access in sensitive meadow vegetation and by avoiding and minimizing ground
disturbance and vegetation removal in this area to the extent possible.
Potential impacts on the Dixie Valley pyrg are discussed in more detail below.
Direct impacts on the Dixie Valley toad in its terrestrial habitat could occur
during construction of the power plants, well pads, and gen-tie line near
breeding habitat in Dixie Meadows. Toads may use terrestrial habitat to forage.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-79
3. Affected Environment and Environmental Consequences
They may use rodent burrows for overwintering or thermal refuge during high
temperatures.
There is a high likelihood that toads use terrestrial habitat near breeding habitat
in Dixie Meadows; therefore, surface grading could crush or bury toads using
burrows in the construction area. Moreover, toads dispersing in the
construction area could be crushed by vehicles or machinery. To avoid this
potential impact, suitable exclusion fencing would be installed around the
perimeter of the work area near suitable breeding habitat in Dixie Meadows.
Preconstruction surveys by a qualified biologist would ensure that toads are not
present in the construction area. If toads were observed, they would be
relocated into suitable habitat outside exclusion fencing.
The project could indirectly impact Dixie Valley toad and Dixie Valley pyrg,
their habitat, and suitable habitat for northern leopard frog. This would be the
case if geothermal utilization were to alter suitable wetland habitat in Dixie
Meadows. If water quality, quantity, or temperature were to be altered by
geothermal production, this could reduce habitat suitability for these species.
Existing thermal conditions in the Dixie Hot Springs may be limiting or excluding
chytridiomycosis infection in Dixie Valley toads (Forrest and Schlaepfer 2011;
Forrest et al. 2013). Because Dixie Meadows represents the entire known
distribution for the Dixie Valley toad, significantly reduced habitat suitability or
Bd introduction could result in extirpation.
Similarly, indirect impacts are not anticipated for the Dixie Valley toad and Dixie
Valley pyrg or their habitat or on suitable habitat for northern leopard frog from
changes in water quality. Examples of these impacts are erosion and runoff and
sedimentation, resulting in reduced water quality, from surface disturbance in
the Project Area. This is because ephemeral washes and drainages would be
avoided to the extent possible. Moreover, erosion environmental protection
measures (Section 2.1.6) would minimize impacts where proposed roads must
cross ephemeral drainages. Such roads could convey runoff to wetlands, ponds,
or other downstream habitat supporting the Dixie Valley toad, Dixie Valley
pyrg, or suitable habitat for northern leopard frog.
3-80 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-81
3. Affected Environment and Environmental Consequences
Birds
Greater Sage-Grouse
Implementation of the Proposed Action would result in approximately 104
acres of disturbance of greater sage-grouse OHMA (BLM GIS 2016); of the 104
acres, 103 acres would be reclaimed following construction. Appendix C of the
Greater Sage-Grouse ROD (BLM 2015a) includes RDFs that are required for
certain activities in all greater sage-grouse habitat, including areas mapped as
OHMA. The RDFs are included as Appendix B of this EA. RDFs establish
specifications to help mitigate adverse impacts on the species. RDFs would not
apply outside of greater sage-grouse OHMA.
In addition to the RDFs, the Decision requires compliance with lek buffers
(Decision Appendix B), Fluid Mineral Stipulations (Decision Appendix G), and
Noise Protocol (Decision Appendix M), as well as applicable Special Status
Species, Leased Fluid Minerals, and Land Use Authorizations Management
Decisions outlined in Decision Section 2.2.
Golden eagle
Implementation of the Proposed Action would result in a net loss of golden
eagle foraging habitat for the life of the project. While the project site does not
support golden eagle nesting habitat, it is expected that golden eagles could
forage within the Project Area throughout the year. Due to the size of the
project compared with available foraging habitat, population-level effects on
golden eagles in the region are unlikely from loss of foraging habitat.
The nearest active nest to the lease areas and northern gen-tie route is located
approximately 5,700 feet (1.1 miles) northwest of the geothermal lease
boundary; this nest is located approximately 7,400 feet (1.4 miles) away from
the northern gen-tie. The nearest inactive nest is approximately 6,050 feet (1.2
miles) from the geothermal lease boundary and approximately 8,300 feet (1.6
miles) from the northern gen-tie (Ormat GIS 2016).
Operation of the gen-tie line could result in direct mortality to golden eagle
from striking the gen-tie line or electrocution, similar to impacts as discussed
under Section 3.5, Migratory Birds. Indirect, temporary effects from noise,
3-82 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
To minimize and avoid impacts, design features (APLIC 2006, 2012) and
construction timing restrictions would be incorporated. These measures are
described in detail in Section 5.1 of the BBCS (Appendix C). As a result,
neither construction nor operation of the project is expected to result in take
or disturbance of golden eagles as defined under the Bald and Golden Eagle
Protection Act.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-83
3. Affected Environment and Environmental Consequences
Mammals
Bats
A BBCS (Appendix C) was developed. Its purposes are to reduce the potential
of injury or mortality to bats from project construction and operation, to
ensure adequate monitoring is in place to determine if mortalities are occurring,
and to provide a mechanism to implement adaptive management as needed to
reduce injury or mortality.
Ponds, tanks, and impoundments (including but not limited to drill reserve pits)
containing liquids can present hazards to bats (BLM 2008c). Bat access to any
liquids contaminated by substances that may be harmful due to toxicity, fouling
of the coat (detergents and oils), or excessive temperatures would be excluded
by wildlife-proof netting or other covering at all times when not in active use.
This measure would conform to Appendix D, Best Management Practices
Mitigation Measures, of the BLMs 2008 geothermal leasing PEIS (see Appendix
F of this EA). Netting specifications are given in the additional mitigation
measures in Section 2.1.6.
Direct impacts on the abandoned mine workings near the Jersey Valley
Geothermal Power Plant are not anticipated, as these sites are avoided, no
activities are proposed at these sites, and no drilling through underground
workings is proposed. However, these sites have a high hazard rating due to
human activity and the extent of workings. To reduce the potential for any
impacts on either bats, which use the workings, or to human safety, no mines
would be entered.
Construction noise and activities could impact roosting bats adjacent to the
Project Area. Because abandoned mine workings near the Jersey Valley
Geothermal Power Plant function as hibernation and maternity locations,
disturbance to roosting bats could be especially damaging to local populations if
impacts were to occur during critical hibernation and maternity periods.
However, construction activities in this area would be limited to installing
several power poles and connecting the northern gen-tie to the existing
substation. Construction duration would be temporary. Further, the existing
power plant at this location would serve to reduce the effects of potential
disturbance from the gen-tie installation. Therefore, any effects on roosting bats
at this location are expected to be minor.
The quieter and more consistent background noise associated with power plant
operation could affect bat foraging ability. Bats may be affected by the power
plants operational noise. This is because they echolocate and receive sound
waves in a wide range of frequencies, including those both audible and inaudible
3-84 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
In effect, noise may create a larger area of habitat disturbance than the project
footprint alone. Operation noise would be minimized by designing the plants to
take advantage of noise-reducing design, including from cooling fans, as
described in Section 2.1.3. Vinyl fencing slats surrounding the plants would
also reduce operational noise in adjacent habitat. BLM regulations mandate that
noise at one-half mileor at the lease boundary if closerfrom a major
geothermal operation shall not exceed 65 A-weighted decibels (43 CFR, Subpart
3200.4[b]).
Foraging habitat for bats is available throughout the Project Area, particularly
meadow areas near the geothermal lease areas. Impacts on foraging habitat
would affect only individual bats and would not impact the local or regional bat
population. This is because bats would likely forage in adjacent undisturbed
habitats.
Additionally, adverse impacts on the springs and seeps in the project vicinity are
unlikely, given avoidance and minimization measures in Section 3.3, Water
Resources, and Section 3.9, Wetlands and Riparian Vegetation; therefore,
indirect impacts on the associated foraging habitat are anticipated to be minor.
Lights used for drilling at night and power plant operations may attract and
concentrate moths and other insects on which bats may feed, which could be a
beneficial effect, though this could also alter bat behavior. To reduce the
impacts on bats from project lighting, motion activated lighting, directed lighting,
shielding methods, and/or reduced lumen intensity lighting would be used.
Pygmy rabbit
The Project Area has marginal habitat for pygmy rabbits, and no pygmy rabbits
or their sign were observed during the biological surveys. However, pygmy
rabbits have been observed in the project vicinity and could be impacted by the
project. Pygmy rabbits could be injured or killed by project construction or
vehicle traffic or have burrows crushed by equipment. Vehicle speeds would be
limited to 25 mph through the area, and roads would be watered during
construction and operations as necessary to control dust. Preconstruction
surveys would be required in all suitable habitat, and burrows would be avoided.
Any impacts on the species or habitat would not likely contribute to a trend
toward federal listing or cause a loss of viability to the population or species.
Kangaroo mice
Surface disturbance associated with construction could result in the loss of
kangaroo mouse habitat. Given the limited surface disturbance, habitat impacts
would be minimal and concentrated around the power plants, well pads, and
gen-tie construction areas. Similar habitat that would not be impacted is
abundant in the project vicinity.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-85
3. Affected Environment and Environmental Consequences
Artificial night lighting sources used primarily during drilling and construction
and, to a lesser extent, during project operations, could impact kangaroo mice if
they were present in the lit area. Using artificial night lighting may cause
nocturnal rodents (such as kangaroo mice) to decrease activity (Kramer and
Birney 2001; Clarke 1983) and alter foraging behavior (Vasquez 1994). Also,
using artificial night lighting can increase owl hunting effectiveness on nocturnal
rodents (Clarke 1983). To reduce impacts on kangaroo mice from project
lighting, motion activated lighting, directed lighting, shielding methods, and
reduced lumen intensity lighting would be used.
With incorporation of the measures above, potential impacts may affect any
kangaroo mice in the Project Area; however, impacts would not cause a loss of
viability to the population or species.
Bighorn sheep
Impacts on bighorn sheep may occur from noise or human presence during
construction. Bighorn sheep may avoid foraging in or crossing through the
Project Area during construction, but this impact would be temporary.
3-86 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
The southern gen-tie alignment would not impact Dixie Meadows or any other
seeps, springs, wetlands, or riparian vegetation. Because this alternative does
not include gen-tie construction or operation within wetland or riparian areas,
direct and indirect impacts on BLM sensitive species and habitats would likely be
substantially reduced, compared with the Proposed Action.
The nearest active golden eagle nest to the southern gen-tie route is
approximately 4,940 feet. Since the nearest active nest to the southern gen-tie
alignment is approximately 2,460 feet closer than the nearest active nest to the
northern gen-tie alignment, the potential for impacts from collision or
electrocution would be somewhat increased under Alternative 1. However,
environmental protection measures under Alternative 1 are the same as those
described under the Proposed Action, including implementation of the BBCS
(Appendix C).
Potential impacts on pale kangaroo mouse may be more likely under Alternative
1. This is because suitable habitat for this species is more prevalent in the
southern portion of the southern gen-tie alignment. The pale kangaroo mouse
occurs in habitats with sandy, wind-blown soils or active or stabilized dunes, and
these habitats are present in the southern gen-tie line route. In order to avoid
or minimize impacts on these species, preconstruction surveys would be
conducted within suitable habitats in early spring to determine presence or
absence of these species. If present, specific avoidance and/or minimization
measures would be determined in consultation with the BLM or NDOW or
both.
Several BLM sensitive plant species also have potential to occur in sandy soils
along the southern gen-tie route; however, they were not detected during
focused botanical surveys in 2013 (ESRS 2013). Therefore, no additional impacts
on BLM sensitive plants are expected from implementation of Alternative 1.
No Action Alternative
Under the No Action Alternative, the BLM would not approve the Proposed
Action, the facilities would not be constructed, and ORNI 32 would likely
suspend exploration activities authorized under the two previous Decision
Records for the foreseeable future. As such, there would be no change in
existing BLM sensitive species conditions at the site.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-87
3. Affected Environment and Environmental Consequences
The USACE describes wetlands as those areas that are inundated or saturated
by surface or groundwater at a frequency and duration sufficient to support, and
that under normal circumstances, do support, a prevalence of vegetation
typically adapted for life in saturated soil conditions.
Signed in 1977, Executive Order 11990 directs federal agencies to prevent the
destruction, loss, or degradation of wetlands and to preserve and enhance the
natural and beneficial values of wetlands in carrying out agency responsibility.
Dixie Valley is an internally drained basin; that is, surface flows terminate in the
basin rather than escaping the basin and flowing west to the Pacific Ocean
(USACE 2002). In a report prepared by the USGS, Dixie Valley is described as a
closed hydrologic unit (Cohen and Everett 1963). These descriptions are
indicative that the basin lacks any hydrologic connectivity to rivers or other
water bodies outside of the basin. Consequently, it is expected that there are
no navigable waters of the United States within Rivers and Harbors Act
jurisdiction (as defined by 33 CFR, Part 329) and no waters of the United States
within CWA jurisdiction (as defined by 33 CFR, Part 328) in the Project Area.
The Dixie Hot Springs are located immediately adjacent to the geothermal lease
areas (the springs are located in the SW, SW of Section 28 and the SE,
SE of Section 29), and vegetation in a small portion of the geothermal lease
areas is characterized as North American Arid West Emergent Marsh (see also
Section 3.6, Vegetation and Figure 6, Surface Water).
3-88 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Moist mixed grasslands are areas that are temporarily to intermittently flooded
and typically support low-growing grasses that tolerate saline and seasonally
saturated soils. Such habitats are commonly transitional between uplands and
wetter areas such as marshes. Saltgrass meadows on playas also fall into this
group. Typical vegetation is inland saltgrass (Distichlis spicata var. stricta) as a
dominant or subdominant species.
Woodlands are habitats with significant shrub or tree cover that range from
temporarily to permanently flooded. Overstory vegetation is typical of Nevadas
riparian areas; willows, Fremont cottonwood, tamarisk, Russian olive, and wild
rose (Rosa woodsia) may be present. These areas are classified as palustrine
scrub-shrub or forested wetlands, often with an emergent wetland understory.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-89
3. Affected Environment and Environmental Consequences
The Humboldt Salt Marsh, a playa, is located in the center of Dixie Valley and is
traversed by a short length of the proposed northern gen-tie alignment. The
playa is subject to inundation from seasonal runoff associated with snowmelt in
surrounding mountain ranges during winter (Bryce et al. 2003). Consequently,
the Humboldt Salt Marsh is considered an ephemeral wetland.
While the USACE may take jurisdiction over playas in general as special aquatic
sites, the USACE is not expected to take jurisdiction over the Humboldt Salt
Marsh, which does not abut and has no surface connection to Waters of the US.
A salt crust covers most of the playa, and vegetation, hydrophytic or otherwise,
is not present over most of the playa. Greasewood and saltgrass are typical salt-
adapted species that grow in the vicinity of the gen-tie alignment crossing.
In 2014, a road was installed through a portion of the main Dixie Meadows hot
spring wetlands to gain access to the existing 230-kV power transmission line
connected to the Dixie Valley (Terra-Gen) Power Plant. The road dissected
approximately half of the Dixie Meadows wetland area and resulted in the
alteration of surface flow patterns that support surrounding and downstream
wetlands, riparian areas, and associated aquatic habitat. The road was removed,
and restoration is currently ongoing. A wetlands mitigation and monitoring plan
was put in place to observe the hydrologic characteristics (temperature, wetted
area, or vegetation) and to intervene if a negative change in habitat quality or
quantity should occur. The road is still affecting surface flow patterns through a
portion of the wetland area (Terra-Gen Dixie Valley 2015a; 2015b).
3-90 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-91
3. Affected Environment and Environmental Consequences
All geothermal fluid produced during facility operations would be reinjected into
the deep geothermal reservoir, maintaining the quantity of the geothermal
resource. As a result, the overall impact on spring discharge and wetland plant
cover from surface or subsurface water levels in wetland areas is expected to
be small. To ensure that any potential impacts are identified, ORNI 32 would
adhere to the Aquatic Resources Monitoring and Mitigation Plan outlined in
Section 2.1.6. Measures in the plan include monitoring and collecting
representative temperature, flow rate, groundwater level measurements, and
specific water quality parameters from selected springs and groundwater
monitoring wells.
3-92 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Indirect effects on wetland and playa habitat could also include potential for
increased weed establishment and spread from soil disturbance during
construction. Weed spread may alter habitat conditions, resulting in changes to
hydrology and vegetation composition. Environmental protection measures
outlined in Section 2.1.6 would reduce potential for weed establishment and
spread, including measures to minimize ground disturbance, prepare a weed
management plan, and use weed-free seed in reclamation activities. As a result,
the Proposed Action would have no net increase in the amount of weeds onsite
during the life of the project.
Indirect impacts could also result from fugitive dust generated during
construction that settles on wetland vegetation, reducing productivity.
Environmental protection measures in Section 2.1.6 include dust control
measures during construction to minimize this impact.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-93
3. Affected Environment and Environmental Consequences
Direct permanent and temporary impacts on playa habitat are expected, and
though this area may be classified as an ephemeral wetland, the USACE is not
expected to take jurisdiction over this area. Direct permanent and temporary
impacts would be minimized by implementation of environmental protection
measures outlined in Section 2.1.6. Additional potential indirect impacts on
wetlands and playa habitat, including establishment and spread of weeds and
deposition of fugitive dust, would be minimized or avoided by implementation of
environmental protection measures outlined in Section 2.1.6.
No Action Alternative
Under the No Action Alternative, the BLM would not approve the Proposed
Action, the facilities would not be constructed, and ORNI 32 would likely
suspend exploration activities authorized under the two previous Decision
3-94 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Signed in 1999, Executive Order 13112 directs federal agencies to prevent the
introduction of invasive species and provide for their control and to minimize
the economic, ecological, and human health impacts that invasive species cause.
To do this, the executive order established the National Invasive Species
Council; currently there are 13 departments and agencies on the council.
The Noxious Weed Control and Eradication Act (Public Law 108-412) of 2004
requires the Secretary of Agriculture to establish a program to assist eligible
weed management entities to control or eradicate noxious weeds on public and
private land.
Additional invasive, nonnative plant species observed in the Project Area include
cheatgrass (Bromus tectorum), halogeton (Halogeton glomeratus), bur buttercup
(Ceratocephala testiculata), and clasping pepperweed (Lepidium perfoliatum).
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-95
3. Affected Environment and Environmental Consequences
The potential for the Proposed Action to increase the spread of noxious weeds
and invasive, nonnative plants would be minimized by environmental protection
measures as described in Section 2.1.6, including preparation of an invasive
plant management plan prior to construction, minimizing surface disturbance
during construction, and using native, weed-free seed during restoration of
temporarily disturbed areas.
No Action Alternative
Under the No Action Alternative, the BLM would not approve the Proposed
Action, the facilities would not be constructed, and ORNI 32 would likely
suspend exploration activities authorized under the two previous Decision
Records for the foreseeable future. As such, existing trends for noxious weeds
and invasive, nonnative plants would continue.
3-96 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
The BLM initiated the VRM process to manage the quality of landscapes on
public lands and to evaluate the potential impacts on visual resources resulting
from development activities. The VRM system addresses different levels of
scenic values, which require different levels of management. The BLM uses four
unique VRM classes to assess scenic values and visual impacts. VRM Class I is the
most restrictive towards landscape alteration and development activities, and
VRM Class IV is the least restrictive (BLM 2007c).
VRM classes are utilized to identify minimum levels to the visual resource when
a proposed development action is analyzed using the BLMs Visual Resource
Management Inventory and Contrast Rating Manuals 8410-1 and 5432-1.1. By
using this system, the impact magnitude on visual resources can be measured by
separating the landscape into its major features (landform, vegetation and
structures) and predicting the magnitude of change to each of the basic visual
elements (line, form, color and texture) within each of the features (BLM
2012a).
The characteristic landscape of the Project Area is dry and arid desert, with the
Stillwater Mountain Range and central Nevada desert surrounding the proposed
project site and gen-tie line.
Sensitive receptors in the Project Area include people recreating in the area.
Recreational activities can include hiking, bird watching, nature photography,
mountain biking, and OHV use.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-97
3. Affected Environment and Environmental Consequences
Table 20
Degree of Contrast Rating
Conformance with VRM
Degree of Contrast Criteria
Class
None The element contrast is not visible or VRM Class I-IV
perceived
Weak The element contrast can be seen but does VRM Class II-IV
not attract attention
Moderate The element contrast begins to attract VRM Class III-IV
attention and begins to dominate the
characteristic landscape
Strong The element contrast demands attention, VRM Class IV only
will not be overlooked, and is dominant in
the landscape
Source: BLM Handbook H-8431-1, Visual Resource Contrast Rating
From each KOP, the viewshed can be divided into three distinct distance zones:
the foreground, mid-ground, and background, as summarized in Table 22, Key
Observation Point Viewsheds.
Table 21
Key Observation Points
Distance from Comments
KOP # Location
Project
KOP 1 Point along Dixie Valley Road Approximately 5 Provides the first
miles south- distant view of the
southwest of power proposed plants for
generation plants. motorized travelers
800 feet west of heading north from
southern gen-tie. Hwy 50 on Dixie
Valley Road.
KOP 2 Point along Dixie Valley Road Approximately 0.5 Provides
miles south- representative view of
southwest of power power generation
generation plants. plants from Dixie
Valley Road near
plants, traveling north.
KOP 5 Point along Dixie Valley Road Approximately 0.5 Provides
miles north of power representative view of
generation plants. power generation
plants from Dixie
Valley Road near
plants, traveling south.
3-98 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Table 21
Key Observation Points
Distance from Comments
KOP # Location
Project
KOP 6 Point along Dixie Valley Road Approximately 2.5 Provides
miles northeast of representative view
power generation of the new northern
plants and 750 feet gen-tie line as it
north of northern parallels existing
gen-tie. transmission line.
KOP 8 Point along Dixie Valley Road Approximately 16 Provides
miles northeast of representative view
power generation of the new northern
plants and 750 feet gen-tie where not
north of northern paralleling existing
gen-tie. transmission line.
Table 22
Key Observation Point Viewsheds
KOP # Foreground Mid-ground Background
KOP 1 Open, relatively smooth, flat, Same as foreground. Rugged terrain
slightly concave valley floor comprised of the
sloping east. Vegetation is flanking ranges.
composed primarily of indistinct Ridges and canyons
mixed salt desert scrub, which is and pyramidal,
low, uniform, and continuous angular shapes
with predominate colors of provide dark and light
yellows, grays, light tans or contrasts from
browns, and seasonal greens. shadows and exposed
rock coloration.
Colors are dark
browns, reds, and
grays.
KOP 2 Open, relatively smooth, flat, Humboldt Salt Marsh, Rugged terrain of the
slightly concave valley floor an unvegetated playa Clan Alpine Range
sloping east toward the feature in the comprised of ridges
Humboldt Salt Marsh. Vegetation topographic low of and canyons and
is indistinct mixed salt desert the valley. pyramidal, angular
scrub, which is low and even but shapes that provide
discontinuous with predominate dark and light
colors of yellow, grays, light tans contrasts from
or browns, and occasional greens. shadows.
Predominant colors
are dark browns and
grays.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-99
3. Affected Environment and Environmental Consequences
Table 22
Key Observation Point Viewsheds
KOP # Foreground Mid-ground Background
KOP 5 Open, relatively smooth, flat, Similar to Rugged terrain of the
slightly concave valley floor foreground; partially Stillwater Range
sloping east toward the valley obscured by mineral comprised of ridges
floor. Vegetation indistinct mixed materials and canyons and
salt desert scrub, which is low development. pyramidal, angular
and even but discontinuous with shapes that provide
predominate colors of yellow, dark and light
grays, light tans or browns, and contrasts from
occasional green. shadows.
Predominant colors
are dark browns and
grays.
KOP 6 Open, relatively smooth, flat, Same as foreground. Rugged terrain
slightly concave valley floor. comprised of the
Vegetation is composed primarily Stillwater Range.
of indistinct mixed salt desert Views are of small
scrub, which is low, uniform, and ridges and canyons
continuous with predominate and pyramidal,
colors of yellow, grays, light tans angular shapes that
or browns, and seasonal greens. provide dark and light
contrasts from
shadows and exposed
rock coloration.
Predominant colors
are dark browns,
reds, and grays.
KOP 8 Nearly flat valley floor, which is Open, smooth, Rugged terrain
open and relatively smooth. slightly concave valley comprised of the
Vegetation indistinct mixed salt center. Vegetation Clan Alpine Range.
desert scrub, which is low, indistinct mixed salt Views are of small
uniform, and continuous with desert scrub, which is ridges and canyons
predominate colors of yellow, low, uniform, and and pyramidal,
grays, light tans or browns, and continuous with angular shapes that
seasonal greens. predominate colors provide dark and light
of yellow, grays, light contrasts from
tans or browns, and shadows and exposed
seasonal greens. rock coloration.
Predominant colors
are dark browns,
tans, and grays.
The proposed project would occur in an area where no VRM classes have been
established (BLM GIS 2016). When no VRM classes exist, the CCD CRMP
standard operating procedures state that an interim VRM objective is to be
assigned at the time a project is proposed. The VRM objectives are to be
3-100 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
developed using the guidelines established in BLM Manual H-8410-1 and must
conform to land use allocations set forth in the CCD CRMP.
The visual contrast rating analysis for all five KOPs found the project
components would be visible and create a contrast with the surrounding
landscape. The predominant vegetation is under 3 feet in height and would not
provide screening of the project. The horizon line would be broken and
discontiguous from most KOPs, thereby reducing contrasting impacts on the
landscape lines and form, since power lines and facilities would generally not
protrude above the skyline. However, from some KOPs, project components
would protrude above the skyline where it is relatively low in elevation. The
project would extend existing visual disturbances and introduce additional
elements into the landscape. However, non-natural features to line and form are
already present from the existing utility poles and lines, Dixie Valley Road,
mineral materials development site, other man-made structures, fence lines, and
other areas with exposed natural sediment.
Drilling equipment would be seen from Dixie Valley Road. Roads, drill pads, and
laydown areas are near ground level and would not affect visual resources.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-101
3. Affected Environment and Environmental Consequences
During the approximately 45-day drilling process for each exploration well, the
top of the drill rig would be up to 170 feet above the ground surface, depending
on the drill rig used. During drilling operations, the rig would be visible at
distances of greater than 1 mile from the respective drill sites, and lights used
when drilling at night would increase rig visibility. All drill rig and well test facility
lights would be limited to those required to safely conduct the operations and
would be shielded and/or directed in a manner that focuses direct light to the
immediate work area.
The gen-tie would generally parallel existing roads and/or transmission lines.
Gen-tie towers would be 55 to 70 feet high and would be visible to travelers on
Dixie Valley Road.
In sum, the facilities constructed for the Proposed Action would be noticeable
to sensitive receptors but would not dominate their view. As such, their impact
on the characteristic landscape would be moderate. As the degree of contrast
and modification imposed on the landscape by the project would fall within the
parameters of VRM Class III objectives, the project would be in conformance
with VRM guidelines and policy. Further, as installation of the prescribed lighting
types along with properly shielded lighting would limit light pollution into the
natural darkness of the high desert environment, these mitigations would limit
lighting impacts on the Nevada dark skies as well as limit light pollution
impacts on local wildlife populations.
3-102 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
No Action Alternative
Under the No Action Alternative, the BLM would not approve the Proposed
Action, the facilities would not be constructed, and ORNI 32 would likely
suspend exploration activities authorized under the two previous Decision
Records for the foreseeable future. As such, there would be no change in
existing visual resource conditions at the site.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-103
3. Affected Environment and Environmental Consequences
3-104 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
historic roads (26Ch3231, 26Ch3236, and 26Pe3460), and a lithic scatter with
an isolated historic can (26Ch1988).
On November 7, 2014, the BLM CCD submitted for SHPO review the subject
document (8110/LLNVC0100/CRR3-2597[P]; SHPO Undertaking 2015-3448
#19762). At that time, in accordance with Section 5.A., the BLM CCD
inventoried all archaeological resources within the APE. It also sought SHPO
concurrence for NRHP eligibility for 36 recorded sites that the BLM CCD
recommended as ineligible for inclusion on the NRHP and that it determined no
further action was necessary. Additionally, the BLM CCD requested SHPO
concurrence on the eligibility determination of the 11 sites and stated no
cultural resources or historic properties would be impacted by the undertaking.
In a letter dated January 6, 2015, SHPO concurred with the BLM CCD
determination that the 36 sites are not eligible for NRHP listing. It also
concurred with the BLM CCDs determination of eligibility of the 11 sites.
In accordance with Section 5.A.4 of the Protocol, the BLM CCD sought to
identify ethnographic resources and TCPs. The BLM CCD has identified the
Dixie Meadows Hot Spring site as an ethnographic resource and potentially a
TCP. It based this on tribal consultation with the Fallon Paiute-Shoshone Tribe
(FPST; see Section 3.13, Native American Religious Concerns) and an
ethnography that took into consideration potential TCPs within the APE
(Ethnographic Synthesis and Context for the Carson City District Office, BLM,
NV [CRR 3-2653]),
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-105
3. Affected Environment and Environmental Consequences
A geothermal plant, well pads, and associated facilities construction would place
modern features onto a landscape that did not have them previously. This
would thereby juxtapose modern industrial features onto a historic landscape.
ORNI 32 would avoid any areas containing cultural resources of significance,
including unevaluated sites and all historic properties that have been
recommended as eligible for listing on the NRHP. Also, a buffer of
approximately 30 to 50 meters (100 to 165 feet) would be established around
eligible and unevaluated cultural sites that lie close to project activities.
Coordination between the BLM, ORNI 32, and WCRM during project
development resulted in rerouting the proposed project components to avoid
impacting these historic properties. Following rerouting components and
implementation of environmental protection measures described in Section
2.1.6, this project should have no adverse impacts on archaeological historic
properties (36 CFR, Subpart 800.4). All sites determined not eligible for listing
on the NRHP do not require further treatment.
However, under Section 5.B.5 of the Protocol, the BLM is treating the Dixie
Hot Springs Site (CrNV-03-E0286) as eligible under all four criteria of the
NRHP (criteria A, B, C, D). The BLM CCD has also determined a finding of
adverse effect on CrNV-03-E0286 and is requesting SHPO concurrence for that
determination. (See Section 3.13, Native American Religious Concerns for
additional discussion and analysis for this site.)
No Action Alternative
Under the No Action Alternative, the BLM would not approve the Proposed
Action, the facilities would not be constructed, and ORNI 32 would likely
3-106 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Toward this end, the BLM has initiated coordination and consultation with
Native American tribal representatives in the Project Area. This process has
provided tribal entities the opportunity to identify potential effects of the
project on Native American interests. This section describes the coordination
process between the BLM and Native Americans, identifies the Native American
resource areas of interest, as well as the projects potential effects on Native
American concerns. Also included are recommended mitigation measures to
avoid or reduce potential impacts on Native American concerns.
Consultation with the Fallon Paiute-Shoshone Tribe was initiated through a face-
to-face meeting between Ms. Terri Knutson, BLM CCD, Stillwater Field
Manager, and the Fallon Paiute-Shoshone Tribal Council, including Alvin Moyle,
Tribal Chairman, on August 25, 2010. A summary and timeline of project
activity and consultation dates are as follows:
Consultation between the FPST and the BLM CCD for geothermal
projects in Dixie Valley began on April 13, 2007. The geothermal
lease parcels surrounding Dixie Meadows were analyzed for the
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-107
3. Affected Environment and Environmental Consequences
In accordance with Section 5.A.4 of the Protocol, the BLM CCD sought to
identify ethnographic resources and TCPs within the APE. It referred to an
ethnographic study that included the Project Area, titled Ethnographic Synthesis
and Context for the Carson City District Office, BLM, NV [CRR 3-2653]. This
study involved the following:
3-108 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Meetings and interviews were open-ended but guided by the research questions.
They focused on identifying historic properties and potential traditional cultural
properties. The study included three tasks: identifying primary contacts,
identifying issues and potential properties and areas of concern, and reporting
the results. The resulting collaborative report (Tiley 2013) was based on the
observations of the cultural specialists and identified sites potentially eligible as
Western Shoshone/Northern Paiute historic properties and as TCPs. It used
these as a basis for identifying potential effects from the project and to propose
mitigation.
The BLM CCD has determined that Dixie Hot Springs is an ethnographic
resource and has potential as a TCP. The CCD has recorded the site on an
ethnography form (CrNV-03-E0286).
In making this determination, the BLM followed National Register Bulletin 38,
Guidelines for Evaluating and Documenting Traditional Cultural Properties. In
order to meet the definition of a TCP, the BLM paid particular attention to the
following three guidelines:
The BLM CCD believes that Dixie Meadows meet these criteria.
Dixie Hot Springs has been used by the FPST as a traditional ceremonial and
healing place for well over 50 years. The FPST continue to use the hot springs
for ceremonial and healing purposes. The FPST identify Dixie Hot Springs as a
sacred locality and one which they consider important to maintaining Western
Shoshone/Northern Paiute cultural beliefs and practices.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-109
3. Affected Environment and Environmental Consequences
In accordance with Sections 5.A.4 and 5.B.5 of the Protocol, the BLM CCD is
treating the Dixie Hot Springs Site (CrNV-03-E0286) as eligible under all four
criteria of the NRHP (criteria A, B, C, D). The BLM CCD has also determined a
finding of adverse effect on CrNV-03-E0286, based on the projects potential
effects.
3-110 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
ORNI 32. The BLM CCD or other qualified professionals would follow the
National Register Bulleting 38, Guidelines for Evaluating and Documenting
Traditional Cultural Properties.
The BLM has proposed mitigation for potential adverse impacts on traditional
medicinal plants. Through consultation with Fallon Paiute-Shoshone Tribe
traditionalists knowledgeable about the location of traditional medicinal plants,
rare medicinal plant locations have been identified and will remain confidential.
These locations will be field-checked by the BLM and by designated Fallon
Paiute-Shoshone Tribe members. Locally abundant or widespread medicinal
plants will not require field-checking. The project has been designed to avoid
rare medicinal plants that have been identified. Other measures, such as
permanent protective fencing, may also be required for avoidance.
No Action Alternative
Under the No Action Alternative, the BLM would not approve the Proposed
Action, the facilities would not be constructed, and ORNI 32 would likely
suspend exploration activities authorized under the two previous Decision
Records for the foreseeable future. As such, there would be no impact on
Native American resources.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-111
3. Affected Environment and Environmental Consequences
Roads in the immediate project vicinity include the Dixie Valley Road and a
network of smaller unpaved roads on BLM-administered land. Road uses include
motorized recreation, access to hunting areas, and administrative and permitted
use. The Project Area has not been formally designated as open, closed, or
limited for motorized travel and is managed like an open OHV area, meaning
cross-country travel is allowed.
Due to the small number of vehicles needed for operation, there would be no
long-term impacts on travel management.
No Action Alternative
Under the No Action Alternative, the BLM would not approve the Proposed
Action, the facilities would not be constructed, and ORNI 32 would likely
suspend exploration activities authorized under the two previous Decision
Records for the foreseeable future. As such, there would be no impact on travel
management.
3-112 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
Approximately 26.7 miles of the southern gen-tie route would be located within
an area that has been segregated from all forms of appropriation under the
public land laws, including the mining laws, mineral leasing laws, and geothermal
leasing laws, subject to valid existing rights. The BLM has segregated this area in
response to an application received from the DON for a withdrawal expansion
for military use of the Naval Air Station Fallon, Fallon Range Training Complex
in Churchill County, Nevada. The segregation is in effect for a period of 2 years
from September 2, 2016, unless the application/proposal is cancelled or
approved prior to that date.
The Proposed Action would not conflict with existing ROWs or uses granted
within them. The BLM would notify all ROW holders in the area of the
proposed project and ensure that the proposed project does not negate rights
granted to them. Because the project would not impact existing ROWs, exceed
or conflict with flight obstruction specifications, or result in degradation of
existing roads or access to public and US Navy lands, impacts on land use
authorizations are not anticipated.
No Action Alternative
Under the No Action Alternative, the BLM would not approve the Proposed
Action, the facilities would not be constructed, and ORNI 32 would likely
suspend exploration activities authorized under the two previous Decision
Records for the foreseeable future. As such, there would be no impact on land
use authorizations.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-113
3. Affected Environment and Environmental Consequences
No Action Alternative
Under the No Action Alternative, the BLM would not approve the Proposed
Action, the facilities would not be constructed, and ORNI 32 would likely
suspend exploration activities authorized under the two previous Decision
Records for the foreseeable future. As such, there would be no impact on
WSAs.
3-114 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
water, drill cuttings and waste drilling mud during drilling operations. The
reserve pit would measure approximately 75 feet by 250 feet by as many as 10
feet deep.
Constructing reserve pits in accordance with the BLM Gold Book (BLM 2007a)
and NDOW Geothermal Sump Guidelines (NDOW no date) would reduce the
risk of accidental release of water, drill cuttings and waste drilling mud during
drilling operations. Reserve pits would only be used for water, drill cuttings, and
waste drill mud; no solid or other waste would be deposited in reserve pits.
Diesel fuel, oil, and lubricants would be used on vehicles traveling on roads in
the Project Area. Gas and/or diesel may be stored in the Project Area in a tank
with secondary containment that reduces the potential for spills. Therefore,
neither short- or long-term impacts from solid or hazardous waste from the
proposed project are expected.
No Action Alternative
Under the No Action Alternative, the BLM would not approve the Proposed
Action, the facilities would not be constructed, and ORNI 32 would likely
suspend exploration activities authorized under the two previous Decision
Records for the foreseeable future. As such, there would be no impact on
public health and safety and hazardous materials.
3.18 SOCIOECONOMICS
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-115
3. Affected Environment and Environmental Consequences
During well drilling and construction of the power plants, substation, and gen-
tie, a temporary workforce of up to approximately 75 workers would utilize
services in and likely commute from their homes in Churchill County.
3-116 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
3. Affected Environment and Environmental Consequences
No Action Alternative
Under the No Action Alternative, the BLM would not approve the Proposed
Action, the facilities would not be constructed, and ORNI 32 would likely
suspend exploration activities authorized under the two previous Decision
Records for the foreseeable future. As such, there would be no short- or long-
term employment, sales taxes, property taxes, or mineral royalties generated by
the proposed project.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 3-117
3. Affected Environment and Environmental Consequences
3-118 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
CHAPTER 4
CUMULATIVE IMPACTS
Cumulative Impacts are defined by the Council on Environmental Quality in 40
CFR 1508.7 as impacts on the environment which result from the incremental
impact of the action when added to other past, present and reasonably
foreseeable future actions regardless of what agency (federal or non-federal) or
person undertakes such other actions. Cumulative impacts can result from
individually minor but collectively significant actions taking place over time. The
analysis area for the cumulative impact analysis is the same as the analysis area
for each resource found in Chapter 3, Affected Environment and
Environmental Consequences.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 4-1
4. Cumulative Impacts
TGP operates the 230-kV Oxbow transmission line that extends to the south
from the Dixie Valley power plant and through the Dixie Meadows Project
Area. Under Alternative 1, the proposed Dixie Meadows 230-kV gen-tie would
parallel the Oxbow line for a majority of its route.
Portions of four livestock grazing allotments overlap the Project Area: the
Boyer Ranch Cottonwood Valley, Dixie Valley, Jersey Valley, and South Buffalo
allotments. Navy training activities, including Night Vision Device aircraft
operations, long range navigation training, combat search and rescue training via
helicopter, and other training activities, occur at the Dixie Valley Training Area
south of the Proposed Action Project Area.
An area of the southern portion of the Dixie Valley has been segregated from all
forms of appropriation under the public land laws, including the mining laws,
mineral leasing laws, and geothermal leasing laws, subject to valid existing rights,
for a period of 2 years from September 2, 2016. It is reasonably foreseeable that
the DON would obtain approval from Congress to withdraw this area for the
next 20 to 30 years for use by the DON for testing and training involving air-to-
ground weapons delivery, tactical maneuvering, use of electromagnetic
spectrum, land warfare maneuver, and air support, as well as other defense-
related purposes consistent with these purposes (81 FR 58919).
4-2 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
4. Cumulative Impacts
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 4-3
4. Cumulative Impacts
administered land in the Dixie Valley would adhere to similar requirements, thus
minimizing cumulative impacts on soil resources.
4.5 VEGETATION
Past, present, and reasonably foreseeable future actions have impacted and
would continue to impact vegetation in the cumulative impact analysis area.
Construction of various administrative rights-of-way for roads and overhead
transmission lines, minerals material sites, and monitoring wells have also
impacted vegetation. Impacts include the removal or alteration of the native
vegetation cover during construction and to a lesser extent during maintenance
of these facilities.
Based on the analysis of direct and indirect impacts, the Proposed Action would
disturb up to 1,982 acres of vegetation, 1,860 acres of which would be
reclaimed following construction. Approximately 122 acres of vegetation would
not be reclaimed following construction. Disturbed areas are primarily
associated with temporary work areas for the gen-tie line. These work areas
would utilize previously disturbed areas (such as the existing road that parallels
much of the proposed gen-tie alignment) when feasible to reduce vegetation
impacts. Incorporating additional environmental protection measures would
further reduce vegetation impacts. These include minimizing vegetation removal
to the extent feasible during construction, interim reclamation following
construction, and final reclamation following site decommissioning. Reclamation
would be conducted to the standards in the BLMs 2008 geothermal leasing
PEIS.
Combined with the past, present, and reasonably foreseeable future actions, the
proposed project would only have a minor cumulative contribution to
vegetation impacts.
4.6 MIGRATORY BIRDS, WILDLIFE AND KEY HABITAT, AND BLM SENSITIVE SPECIES
Past, present, and reasonably foreseeable future actions have impacted and
would continue to have impacts on migratory birds, wildlife, and BLM sensitive
species. These resources could be adversely affected by displacement or
disruption of normal behavioral patterns. In particular, construction, and project
operations and maintenance for geothermal energy development may have the
greatest potential to adversely affect wildlife and habitat. Energy development in
the region could fragment habitats, decrease aquatic habitat suitability, and
disrupt wildlife movement corridors. In addition, some of these projects and
actions could increase traffic, conflicts with humans, and competition for habitat
niches.
Past, present, and reasonably foreseeable future actions have impacted and
would continue to impact BLM sensitive wildlife species, including aquatic
species like Dixie Valley pyrg and Dixie Valley toad. Past exploration and
development of geothermal resources within leased areas, livestock grazing and
ranching, and dispersed recreation may have impacted these species through
4-4 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
4. Cumulative Impacts
disturbance and human presence. These actions have also impacted and would
continue to impact BLM sensitive avian species and migratory birds by habitat
alteration or by removing nesting and/or foraging habitat. Low-flying military
aircraft have also likely caused mortality from collisions during routine US Navy
training. Overhead transmission lines have provided some nesting and perching
habitat for raptor species but simultaneously increased predation of small
mammals, reptiles, and ground-nesting bird species.
Past, present, and reasonably foreseeable future actions have impacted and
would continue to have impacts on BLM sensitive plant species in the cumulative
impacts analysis area. Actions with the greatest potential to impact BLM
sensitive plants are those involving surface disturbance, including energy
exploration and development. These actions have resulted in removal of BLM
sensitive plant individuals and reduced habitat quality, including by facilitating
weed establishment and spread.
Based on the analysis of direct and indirect impacts, the Proposed Action would
cause a minimal change in noise levels and approximately 122 acres of habitat
loss that would not be reclaimed following construction. Permanent impacts
would be primarily limited to power plants and substation, wells, construction
of the gen-tie alignment, and access roads. Incorporating the BBCS (Appendix
C), environmental protection measures, and the Aquatic Resources Monitoring
and Mitigation plan outlined in Section 2.1.6 would minimize or avoid impacts
on migratory birds, wildlife and key habitat, and BLM sensitive species. This
would come about by minimizing ground disturbance, conducting
preconstruction surveys, performing interim and final habitat reclamation,
implementing seasonal restrictions for sensitive species, implementing water
monitoring and mitigation measures, clearing work areas for nesting birds and
other sensitive resources prior to construction, implementing required design
features for greater sage-grouse, and avoiding BLM sensitive plant species. As
such, the proposed project would only have a minor contribution to cumulative
impacts on migratory birds, wildlife and key habitat, and BLM sensitive wildlife
species within the analysis area, and would not contribute to cumulative impacts
on BLM sensitive plant species, when combined with past, present, and
reasonably foreseeable future actions.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 4-5
4. Cumulative Impacts
Based on the analysis of direct and indirect impacts, the Proposed Action would
disturb up to 1,982 acres, 1,860 acres of which would be reclaimed following
construction. Disturbed areas are primarily associated with temporary work
areas for the gen-tie line. These work areas would utilize previously disturbed
areas (such as the existing road that parallels much of the proposed gen-tie
alignment) when feasible. The applicant would control noxious weed
populations by preparing and implementing an invasive plant management plan,
minimizing surface disturbance during construction, and using weed-free seed
during restoration of temporarily disturbed areas as summarized in Section
2.1.6. Therefore, the Proposed Action would result in few additional impacts
from noxious, invasive plant species and there would be little or no incremental
increase in cumulative effects from noxious, invasive plant species from the
Proposed Action.
Development of well pads and the gen-tie may result in direct and indirect
impacts including wetland and riparian vegetation loss, erosion and sediment
transport into wetland areas. Indirect impacts may also include alteration of
surface flow leading to loss of wetland and riparian habitat, in addition to
erosion and sediment transport. Soil disturbance associated with these activities
and the past, present, and reasonably foreseeable future actions described above
can contribute to weed spread, potentially into wetland areas.
4-6 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
4. Cumulative Impacts
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 4-7
4. Cumulative Impacts
uses such as OHV use, interpretive trails, and mountain biking, are among many
increasing activities within the BLM CCD, Stillwater Field Office administrative
boundary.
In addition to all the existing, growing, and developing uses of the public lands,
fluid mineral leasing and exploration would continue to contribute to the
general decline in sites and associated activities of a cultural, traditional, and
spiritual nature. However, these activities occur on a very small percentage of
the total land area.
4-8 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
4. Cumulative Impacts
combined with impacts from past, present, and reasonably foreseeable future
actions.
4.16 SOCIOECONOMICS
The Proposed Action would have a short-term beneficial cumulative effect from
the creation of construction jobs during the construction period. Operation of
the proposed facilities and any future energy generating facilities in the Dixie
Valley would have a minor beneficial cumulative effect through the number of
jobs created and the collection of mineral royalties when combined with
impacts from past, present, and reasonably foreseeable future actions.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 4-9
4. Cumulative Impacts
4-10 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
CHAPTER 5
CONSULTATION AND COORDINATION
5.1 AGENCIES, GROUPS, AND INDIVIDUALS CONTACTED
The following agencies, groups, and individuals were contacted for the
preparation of the EA:
ORNI 32
Mark Hanneman, Project Manager
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 5-1
5. Consultation and Coordination
coordination conducted for the original Dixie Meadows exploration project was
incorporated into this EA.
Table 23
List of Preparers
Name Project Expertise
BLM Carson City District, Stillwater Field Office
Angelica Rose NEPA, Socioeconomics, Land Use Authorizations,
Public Health and Safety
Dave Schroeder Project Lead, Hazardous or Solid Wastes, Public
Health and Safety
Dan Westermeyer Visual Resources, Travel Management
Melanie Hornsby Visual Resources, Travel Management
Mark Mazza Invasive, Nonnative Species
Melanie Cota Migratory Birds, Wildlife and Key Habitat, BLM
Sensitive Species, Threatened and Endangered
Species
Jason R. Wright Tribal Consultation, Cultural Resources, Native
American Religious Concerns
Michelle Stropky Hydrologist, Wetlands and Riparian Areas, Air
Quality
Ken Depaoli Geologist
Linda Appel Vegetation
Melanie Hornsby Wilderness/Wilderness Study Areas
BLM Humboldt River Field Office
Keysha Fontaine (Great Basin Institute, Wildlife Biologist
Contracted with the BLM)
EMPSi
Drew Vankat Project Manager, NEPA, Travel Management, Cultural
Resources, Native American Religious Concerns,
Hazardous or Solid Wastes, Land Use
Authorizations, Socioeconomics
Kevin Rice Visual Resources
Jenna Jonker Geographic Information Systems
Morgan Trieger Vegetation, Migratory Birds, Wildlife and Key Habitat,
BLM Sensitive Species, Invasive, Nonnative Species,
Wetlands and Riparian Areas, Visual Resources
Meredith Zaccherio, Morgan Trieger, Daniel Biological Survey Report
Robison
5-2 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
CHAPTER 6
REFERENCES
Audubon Society. 2016. Important Bird Areas Lahontan Valley Wetlands, Nevada. Internet website:
http://www.audubon.org/important-bird-areas/lahontan-valley-wetlands.
Avian Power Line Interaction Committee (APLIC). 2006. Suggested Practices for Avian Protection on
Power Lines: The State of the Art in 2006. Edison Electric Institute and APLIC. Washington, DC.
_____. 2012. Reducing Avian Collisions with Power Lines: The State of the Art in 2012. Edison Electric
Institute and APLIC. Washington, DC.
Benoit, D. 1999. Conceptual Models of the Dixie Valley, Nevada Geothermal Field. Geothermal Resources
Council Transactions 23:505-511.
Benoit, D., S. Johnson, and M. Kumataka. 2000. Development of an injection augmentation program at
the Dixie Valley Nevada Geothermal Field. Proceedings of the World Geothermal Congress 2000,
Kyushu-Tohoku Japan, May 28June 10, 2000.
Blackwell, D. D., M. Leidig, and R. P. Smith. 2002. Regional geophysics of the Dixie Valley Area:
Example of a large basin and range geothermal resource. Geothermal Resources Council
Transactions 26:519522.
Blackwell, D. D., K. W. Wisian, M. C. Richards, M. Leidig, R. Smith, and J. McKenna. 2003. Geothermal
resource analysis and structure of basin and range systems, especially Dixie Valley geothermal
field, Nevada. Southern Methodist University Department of Geological Sciences, Dallas, Texas.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 6-1
6. References
Blackwell, D. D., R. P. Smith, and M. C. Richards. 2007. Exploration and Development at Dixie Valley,
Nevada: Summary of Department of Energy Studies. Proceedings of the Thirty-Second
Workshop on Geothermal Reservoir Engineering. Stanford, California.
Blackwell, D. D., R. P. Smith, A. Waibel, M. Richards, and P. Stepp. 2009. Why basin and range systems
are hard to find II: Structural model of the producing geothermal system in Dixie Valley,
Nevada. Geothermal Resources Council Transactions 33:441446.
BLM (United States Department of Interior, Bureau of Land Management). 2001. Consolidated Resource
Management Plan. Carson City Field Office, Carson City, Nevada.
_____. 2007a. Surface Operating Standards and Guidelines for Oil and Gas Exploration and
Development, Fourth Edition (Gold Book). Internet website: https://www.blm.gov
/style/medialib/blm/wo/MINERALS__REALTY__AND_RESOURCE_PROTECTION_/energy/oil
_and_gas.Par.18714.File.dat/OILgas.pdf.
_____. 2007b. Memorandum No. 2008-050. BLM Interim Management Guidance - Migratory Bird
Treaty Act and Executive Order 13186. December 18, 2007. Bureau of Land Management,
Washington, DC.
_____. 2007c. Visual Resource Management: VRM System. Internet website: http://www.blm.gov/nstc/
VRM/vrmsys.html.
_____. 2008a. National Environmental Policy Act Handbook H-1790-1. January 2008. BLM, Washington,
DC.
_____. 2008b. Carson City District NEPA Compliance Guidebook (Draft). Carson City District Office,
Carson City, Nevada.
_____. 2008c. Final Programmatic Environmental Impact Statement for Geothermal Leasing in the
Western United States. FES 08-44. Internet website: www.blm.gov/wo/st/en/prog/
energy/geothermal/geothermal_nationwide/Documents/Final_PEIS.html.
_____. 2008d. Record of Decision and Resource Management Plan Amendments for Geothermal
Leasing in the Western United States. BLM-WO-GI-09-003-1800, FES 08-44. Bureau of Land
Management, Washington, DC.
_____. 2008e. Manual 6840 Special Status Species Management. Bureau of Land Management,
Washington, DC.
_____. 2010. Environmental Assessment, TGP Dixie Development Company, LLC, Coyote Canyon and
Dixie Meadows Geothermal Exploration. Document Number DOI-BLMNV- C010-2010-0010-
EA. Carson City, Nevada: Bureau of Land Management, Carson City District Office.
6-2 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
6. References
_____. 2011b. Nevada BLM Sensitive Species List. Instruction Memorandum NV-2011-59. Signed 06-27-
2011. Reno, Nevada.
_____. 2012b. Manual 6330 Management of Wilderness Study Areas. Bureau of Land Management,
Washington, DC.
_____. 2014. Fluid Mineral Leasing within Six Areas of Churchill, Lyon, Mineral and Nye Counties,
Nevada on the Carson City District. DOI-BLM-NV-C010-2014-0013-EA. Bureau of Land
Management, Carson City District Office, Carson City, Nevada.
_____. 2015a. Nevada and Northeastern California Greater Sage-Grouse Approved Resource
Management Plan Amendment. Bureau of Land Management, Nevada State Office, Reno,
Nevada.
_____. 2015b. Record of Decision and Resource Management Plan for the Winnemucca District
Planning Area. Bureau of Land Management, Winnemucca District Office, Winnemucca, Nevada.
BLM GIS. 2016. GIS data online or on BLM eGIS server. Stillwater Field Office, Carson City District
Office, Carson City, Nevada.
Bruton, C. J., D. Counce, D. Bergfeld, F. Goff, S. D. Johnson, J. N. Moore, and G. Nimz. 1997.
Preliminary investigation of scale formation and fluid chemistry at the Dixie Valley geothermal
field, Nevada. Geothermal Resources Council Transactions annual meeting, Burlingame,
California. October 1215, 1997.
CEQ (Council on Environmental Quality). 1997. Considering Cumulative Effects Under the National
Environmental Policy Act. Washington, DC. January 1997.
CH2M HILL. 2009. Final biological survey report for the Coyote Canyon and Dixie Meadows
geothermal facilities. Prepared for TGP Dixie Development Company, LLC., Reno, Nevada.
Clarke, J. A. 1983. Moonlights influence on predator/prey interactions between short-eared owls (Asio
flammeus) and deermice (Peromyscus maniculatus). Behavioral Ecology and Sociobiology 13:205209.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 6-3
6. References
Cohen, P., and D. E. Everett. 1963. A Brief Appraisal of the Ground-Water Hydrology of the Dixie-
Fairview Valley Area, Nevada. Ground-Water Resources Reconnaissance Series Report 23.
State of Nevada Department of Conservation and Natural Resources, Carson City, Nevada.
Conway, C. J., and J. C. Simon. 2003. Comparison of detection probability associated with burrowing
owl survey methods. Journal of Wildlife Management 67(3):501-511.
Cowardin, L. M., V. Carter, F. C. Golet, and E. T. LaRoe. 1979. Classification of Wetlands and
Deepwater Habitats of the United States. US Department of the Interior, US Fish and Wildlife
Service FWS/OBS-79/31. Washington, DC.
DOI (United States Department of Interior). 2008. Department of the Interior Departmental Manual
516. Washington, DC.
Drever, J. I. 1982. The geochemistry of natural waters: Surface and Groundwater Environments.
Prentice-Hall Publishing, Englewood Cliffs, New Jersey.
Eagles, P. F. J., S. F. McCool, and C. D. Haynes. 2002. Sustainable Tourism in Protected Areas: Guidelines
for Planning and Management. Best Practice Protected Area Guidelines No. 8. World
Commission on Protected Areas. IUCN, Gland, Switzerland.
EMPSi (Environmental Management and Planning Solutions, Inc.). 2016. Biological Survey Report. ORNI
32, LLC. Dixie Meadows Geothermal Utilization Project. Pershing and Churchill Counties,
Nevada.
ESRS (EcoSynthesis Scientific & Regulatory Services, Inc.). 2013. New Dixie Hope Project Botanical
Survey. Prepared for EMPSi, Boulder, Colorado.
Federal Register 59 FR 35607. 1994. Changes in hydric soils of the United States. July 13, 1994.
Federal Register 81 FR 60736. 2016. Notice of Application for Withdrawal Extension; Notice of
Application for Withdrawal Expansion; and Opportunity for Public Meeting; Naval Air Station,
Fallon, Nevada. September 2, 2016.
Federal Register 81 FR 58919. Notice of Intent to Prepare an Environmental Impact Statement and to
Announce Public Scoping Meetings for the Fallon Range Training Complex Modernization:
Expansion of Land Ranges, Airspace Modifications, and Public Land Withdrawal Renewal. August
26, 2016.
FEMA (Federal Emergency Management Agency). 2008. Flood Insurance Rate Map Number
32001C0825F, Churchill County, Nevada. National Flood Insurance Program, FEMA,
Washington, DC.
Forrest, M. J., and M. A. Schlaepfer. 2011. Nothing a hot bath wont cure: Infection rates of amphibian
chytrid fungus correlate negatively with water temperature under natural field settings. PLoS
One 6:e28444.
6-4 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
6. References
Forrest, M. J., K. D. Urquhart, J. F. Harter, O. J. Miano, and B. D. Todd. 2013. Habitat loss and the
amphibian chytrid fungus Batrachochytrium dendrobatidis may threaten the Dixie Valley toad, a
narrowly distributed endemic species. Chapter 4 In: M. J. Forrest. 2013. Ecological and
geochemical aspects of terrestrial hydrothermal systems. Doctoral dissertation, University of
California, San Diego.
Frest, T. J., and E. J. Johannes. 1995. Interior Columbia Basin Mollusk Species of Special Concern. Final
report: Interior Columbia Basin Ecosystem Management Project. Contract #43-OEOO-4-9112,
Walla Walla, Washington.
GBBO (Great Basin Bird Observatory). 2010. Comprehensive Bird Conservation Plan for Nevada.
Internet website: http://www.gbbo.org/projects_bcp.html.
_____. 2016. Avian point count data collected within 10 kilometers of the Dixie Meadows Project Area.
Great Basin Bird Observatory, Reno, Nevada.
Goff. F., D. Bergfeld, C. J. Janik, D. Counce, and M. Murrell. 2002. Geochemical data on waters, gases,
scales, and rocks from the Dixie Valley Region, Nevada (19961999). Los Alamos National
Laboratory, Technical Report LA-13972-MS. Los Alamos National Laboratory, New Mexico.
Great Basin Center for Geothermal Energy. 2009. University of Nevada, Reno Great Basin
Groundwater Geochemical Database. Internet website: http://www.nbmg.unr.edu/
geothermal/GeochemDatabase.html.
_____. 2016. University of Nevada, Reno Great Basin Groundwater Geochemical Database. Internet
website: http://www.nbmg.unr.edu/Geothermal/GeochemDatabase.html.
Green, J. S., and J. T. Flinders. 1980. Brachylagus idahoensis. Mammalian Species 125:14.
Hickman, S., C. A. Barton, M. D. Zoback, R. H. Morin, J. Sass, and R. Benoit. 1997. In Situ Stress and
Fracture Permeability in a Fault-Hosted Geothermal Reservoir at Dixie Valley, Nevada.
Geothermal Resources Council Transactions. Volume 21. Burlingame, California.
Hershler, R. 1998. A systematic review of the hydrobiid snails (Gastropoda: Rissooidea) of the Great
Basin, western United States. Part I. Genus Pyrgulopsis. The Veliger 41(1):1-132.
Huntington, J. M., Garcia, C. A., and Rosen, M. R. 2014. Hydrogeologic framework and occurrence,
movement, and chemical characterization of groundwater in Dixie Valley, west-central Nevada,
US Geological Survey Scientific Investigations Report 20145152. US Geological Survey, Reston,
Virginia. Internet website: http://dx.doi.org/10.3133/sir20145152.
Interflow Hydrology and Mahannah and Associates (Interflow Hydrology, Inc., and Mahannah and
Associates, LLC.). 2012a. Dixie Valley spring reconnaissance and sampling report. Prepared for
Churchill County, Nevada. Interflow Hydrology, Inc., Truckee, California, and Mahannah and
Associates, Reno, Nevada.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 6-5
6. References
_____. 2012b. Summary of Aquifer Testing and Analysis, Dixie Valley. Prepared for Churchill County,
Nevada. Interflow Hydrology, Inc., Truckee, California, and Mahannah and Associates, Reno,
Nevada.
Iovenitti, J., J. Sainsbury, I. Tibuleac, R. Karlin, P. Wannamaker, V. Maris, D. Blackwell, M. Thakur, et al.
2013. EGS exploration methodology project using the Dixie Valley geothermal system, Nevada,
status update. Proceedings, Thirty-Eighth Workshop on Geothermal Reservoir Engineering. Stanford
University, Stanford, California, February 1113, 2013.
Karst, G. B. 1987. Analysis of the Northern Dixie Valley Groundwater Flow System using a discrete-
state compartment model. M.S. thesis, University of Nevada, Reno, Nevada.
Kramer, K. M., and E. C. Birney. 2001. Effect of light intensity of activity patterns of Patagonian leaf-
eared mice, Phyllotis Xanthopygus. Journal of Mammology 82(2):535544.
Maser, C., J. W. Thomas, and R. G. Anderson. 1984. Wildlife Habitats in Managed Rangelands The
Great Basin of Southeastern Oregon. The Relationship of Terrestrial Vertebrates to Plant
Communities. General Technical Report PNW172. USDA Forest Service, Pacific Northwest
Research Station, USDI Bureau of Land Management, La Grande, Oregon.
McKenna, J. R., and D. D. Blackwell. 2004. Numerical modeling of transient Basin and Range extensional
geothermal systems. Geothermics 33:657662.
Nachlinger, J., K. Sochi, P. Comer, G. Kittel, and D. Dorfman. 2001. Great Basin: an ecoregion-based
conservation blueprint. The Nature Conservancy, Reno, Nevada.
NAS Fallon (Naval Air Station Fallon). 2008. Ecological inventory update: Naval Air Station Fallon. Naval
Facilities (NAVFAC) Southwest Report Contract N68711-05- D-8004/0019, San Diego,
California.
_____. 2011. Herpetological Inventory Naval Air Station Fallon, Fallon, Nevada. Naval Facilities
Engineering Command Southwest Report Contract N62473-10-2-0008. San Diego, California.
_____. 2014. Final Integrated Natural Resources Management Plan Naval Air Station Fallon, Fallon,
Nevada. Naval Facilities Engineering Command Southwest Report Contract N62473-07-D-
3201.0011. San Diego, California.
_____. 2015. Final Vegetation and Rare Plant Surveys Naval Air Station Fallon, Fallon, Nevada. Naval
Facilities Engineering Command Southwest Report Contract N62473-11-2225/D.O. 0034. San
Diego, California.
NDOM (Nevada Division of Minerals). 2016. Abandoned mine lands hazard identification sheets within 1
kilometer of the Dixie Meadows Project Area. Nevada Division of Minerals, Carson City,
Nevada.
6-6 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
6. References
_____. 2016. Request for Information Dixie Meadows Geothermal. NDOW, Reno, Nevada.
_____. No date. Design Features and Tools to Reduce Wildlife Mortalities Associated with Geothermal
Sumps. NDOW, Reno, Nevada.
NDWR (Nevada Division of Water Resources). 2015. Designated Groundwater Basins of Nevada.
Internet website: http://water.nv.gov/mapping/maps/designated_basinmap.pdf.
_____. 2016a. Water Rights Database Advanced Search (Special Hydrographic Abstract). Internet
website: http://water.nv.gov/data/hydrographic/?.
_____. 2016b. Hydrographic Area Summary for Dixie Valley. Internet website:
http://water.nv.gov/data/underground/printableSummary.cfm?basin=128&CFID=6104367&CFTO
KEN=93ae0fdc0f89ea27-22A66290-D64F-28B6-4226A6A84303A43E.
NHD (National Hydrography Dataset) GIS. 2016. Published GIS data of hydraulic features. Internet
website: ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Hydrography/NHD/State/.
Nimz, G., C. Janik, F. Goff, C. Dunlap, M. Huebner, D. Counce, and S. Johnson. 1999. Regional
Hydrogeology of the Dixie Valley Geothermal Field, Nevada: Preliminary Interpretations of
Chemical and Isotopic Data. Lawrence Livermore National Laboratory, Livermore, California.
US Department of Energy Preprint UCRL-JC-135417.
NNHP (Nevada Natural Heritage Program). 2001. Nevada Rare Plant Atlas. NNHP, Carson City,
Nevada. Internet website: http://heritage.nv.gov/atlas.
_____. 2016. Data query for Dixie Valley Geothermal Utilization Project. NNHP, Carson City, Nevada.
NPS (National Park Service). 1998. Cultural Resource Management Guideline, NPS-28. Internet website:
https://www.nps.gov/parkhistory/online_books/nps28/28intro.htm.
NRCS (US Department of Agriculture, Natural Resources Conservation Service). 2016. Official Soil
Series Descriptions. USDA NRCS, Washington, DC. Internet website:
https://soilseries.sc.egov.usda.gov/.
NRCS GIS. 2016. Published soils data of soil surveys NV769 and NV770 published 8/18/2014. Internet
website: https://gdg.sc.egov.usda.gov/GDGOrder.aspx.
NWI (National Wetland Inventory) GIS. 2016. Published GIS data of wetlands and riparian vegetation.
Internet website: https://www.fws.gov/wetlands/data/State-Downloads.html.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 6-7
6. References
Ormat. 2011. Dixie Hope Geothermal Project Water Resources Monitoring Plan. Prepared for the
Bureau of Land Management, Stillwater Field Office, Carson City, Nevada.
_____. 2012. Dixie Hope MW-1 Sample Results. Memorandum to Edward P. Klimasauskas, Bureau of
Land Management, June 8, 2012.
_____. 2016. Dixie Meadows MW-1 Sample Results. Memorandum to Michelle Stropky, Bureau of Land
Management, December 16, 2016.
Ormat GIS. 2016. Unpublished GIS data of project facilities. Ormat Technologies, Inc. Reno, Nevada.
Pagel, J. E., D. M. Whittington, and G. T. Allen. 2010. Interim Golden Eagle technical guidance: inventory
and monitoring protocols; and other recommendations in support of eagle management and
permit issuance. Division of Migratory Bird Management, US Fish and Wildlife Service, Arlington,
Virginia.
Paton, P. W., and T. C. Edwards. 1990. Status and ecology of the Snowy Plover at Great Salt Lake
1990. Utah Birds 6:49-66.
Rich, C., and T. Longcore (Eds.). 2006. Ecological Consequences of Artificial Night Lighting. Island Press,
Washington, DC.
Rogers, S. D., and M. M. Peacock. 2012. The disappearing northern leopard frog (Lithobates pipiens):
conservation genetics and implications for remnant populations in western Nevada. Ecology and
Evolution 2(8):2040-2056.
Rose, J. P., O. J. Miano, G. R. Cottle, R. E. Lovich, R. L. Palmer, and B. D. Todd. 2015. A herpetological
inventory of Naval Air Station Fallon, Churchill County, Nevada. Western North American
Naturalist 75(4):526-534.
Schroeder, M. A., J. R. Young, and C. E. Braun. 1999. Greater Sage-Grouse - Centrocercus urophasianus
(P. G. Rodewald, ed.). The Birds of North America. Ithaca: Cornell Lab of Ornithology; Retrieved
from the Birds of North America. Internet website: https://birdsna.org/Species-
Account/bna/species/saggro. DOI: 10.2173/bna.425.
SWReGAP GIS. 2005. GIS data of landcover types. USGS National Gap Analysis Program. Internet
website: http://swregap.nmsu.edu/.
Terra-Gen Dixie Valley, LLC. 2015a. Wetland Mitigation and Monitoring Plan, Dixie Meadows
Retrograde, Churchill County, Nevada. Terra-Gen Dixie Valley, LLC., Reno, Nevada.
_____. 2015b. Spring Source Methodology Supplement to the Wetlands Mitigation and Monitoring
Plan, Dixie Meadows Retrograde. Terra-Gen Dixie Valley, LLC., Reno, Nevada.
Tiley, S. and T. McBride. 2013. Ethnographic Synthesis and Context for the Carson City District Office,
Bureau of Land Management, Carson City, Nevada.
6-8 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017
6. References
USACE (US Army Corps of Engineers). 2002. Defense Environmental Restoration Program for Formerly
Used Defense Sites Ordnance and Explosives, Archives Search Report Findings Dixie Valley
Bombing Target Number 21, Churchill County, Nevada. Project Number: JO9NV112301. US
Army Corps of Engineers, St. Louis District, St. Louis, Missouri.
US Census Bureau.2014a. Churchill County QuickFacts from the US Census Bureau. Internet website:
http://quickfacts.census.gov/qfd/states/32/32001.html.
_____. 2014b. Fallon (city) QuickFacts from the US Census Bureau. Internet website:
http://quickfacts.census.gov/qfd/states/32/3224100.html.
USFWS (United States Fish and Wildlife Service). 2000. Service Guidance on the Siting, Construction,
Operation, and Decommissioning of Communication Towers. USFWS, Washington, DC.
_____. 2004. A Blueprint for the Future of Migratory Birds. Migratory Bird Program Strategic Plan
2004-2014. United States Department of Interior, Fish and Wildlife Service. Internet website:
http://www.fws.gov/Migratorybirds/Aboutus/Mbstratplan/Mbstratplantoc.html.
_____. 2008. Birds of Conservation Concern 2008. United States Department of Interior, Fish and
Wildlife Service, Division of Migratory Bird Management, Arlington, Virginia.
_____. 2010. Endangered and Threatened Wildlife and Plants; 12month Finding on a Petition to List the
Pygmy Rabbit as Endangered or Threatened; Proposed Rule. 50 CFR, Part 17. Federal Register
75(189):6051660561.
_____. 2013. Game birds below desired condition (GBBDC). Internet website:
http://digitalmedia.fws.gov/cdm/ref/collection/document/id/1438. Updated March 6, 2013.
_____. 2016. List of threatened and endangered species for the Dixie Valley Geothermal Utilization
Project. Reno Fish and Wildlife Office, Reno, Nevada. May 4, 2016.
USGS (United States Geological Survey). 2005. National Gap Analysis Program. Southwest Regional
GAP Analysis ProjectLand Cover Descriptions. RS/GIS Laboratory, College of Natural
Resources, Utah State University.
_____. 2016. USGS Water-Data Site Information for the Nation. Internet website:
http://waterdata.usgs.gov/nwis/si.
US Navy GIS. 2016. GIS data from a 2007 wetland delineation on US Navy lands. Data received
November 2016.
Vsquez, R. A. 1994. Assessment of predation risk via illumination level: Facultative central place
foraging in the cricetid rodent Phyllotis darwini. Behavioral Ecology and Sociobiology 34:375381.
WCRM (Western Cultural Resource Management, Inc.). 2014. A Class III Cultural Resources Inventory
of 3,239 Acres for the Ormat Technologies Inc., Dixie Valley to Jersey Valley Transmission Line
and Infrastructure Locations in Churchill and Pershing Counties, Nevada. Prepared by Tara
Cannon, M.A., RPA. Revised July 23, 2014.
May 2017 Dixie Meadows Geothermal Utilization Project Environmental Assessment 6-9
6. References
WildEarth Guardians. 2010. Petition to List Ten Great Basin Butterflies under the US Endangered
Species Act - Petition Submitted to the US Secretary of Interior Acting through the US Fish and
Wildlife Service. WildEarth Guardians, Santa Fe, New Mexico.
Wildlife Action Plan Team. 2012. Nevada Wildlife Action Plan. Nevada Department of Wildlife, Reno,
Nevada. Internet website: http://www.ndow.org/Nevada_Wildlife/Conservation/
Nevada_Wildlife_Action_Plan/.
WRC (Wildlife Resource Consultants). 2013. Ormat Dixie Hope Project Baseline Wildlife Surveys.
Prepared for EMPSi, Boulder, Colorado.
Yosef, R., and T. C. Grubb, Jr. 1994. Resource dependence and territory size in loggerhead shrikes
(Lanius ludovicianus). Auk 111:465469.
Zoback, M. D. 2007. Reservoir Geomechanics. Cambridge University Press, New York, New York.
6-10 Dixie Meadows Geothermal Utilization Project Environmental Assessment May 2017