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Terrapower CP Env Docs - Wetlands and Other Waters of the U.S. Delineation Report, Natrium Project, Jan 2023, Tetra Tech
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Wetlands and Other Waters of the U.S.

Delineation Report Natrium Project Lincoln County, Wyoming

January2023 Prepared for Bechtel Prepared by Confidential Business Information. Do Not Distribute.

Wetlands and Other Waters Surveys Natrium Project i

TABLE OF CONTENTS 1.

INTRODUCTION........................................................................................................... 1 1.1 Project Background.................................................................................................................. 1 1.2 Project Area............................................................................................................................... 1 2.

REGULATORY FRAMEWORK........................................................................................... 2 2.1 Federal Regulations.................................................................................................................. 2 2.2 State Regulations..................................................................................................................... 2 2.2.1 Wyoming Wetlands Act................................................................................................ 2 2.2.2 General Permit for Wetland Mitigation....................................................................... 3 3.

METHODOLOGY........................................................................................................... 3 3.1 Desktop Review........................................................................................................................ 3 3.2 Wetland Delineation................................................................................................................. 3 3.3 Wetland Functional Assessment.............................................................................................. 4 3.4 Stream Delineation................................................................................................................... 5 4.

RESULTS..................................................................................................................... 6 4.1 Desktop Results........................................................................................................................ 6 4.1.1 Soils.............................................................................................................................. 6 4.1.2 Wetlands and Waters................................................................................................... 6 4.1.3 Floodplains.................................................................................................................. 6 4.2 Field Delineation Results.......................................................................................................... 7 4.2.1 Wetlands...................................................................................................................... 7 4.2.2 Streams........................................................................................................................ 8 5.

DISCUSSION................................................................................................................ 9 6.

LITERATURE CITED....................................................................................................... 9 TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

Wetlands and Other Waters Surveys Natrium Project ii LIST OF TABLES Table 1. Wetland Indicator Status and their Percent Occurrence within Wetlands................................ 4 Table 2. Soil Types within the Project Area............................................................................................... 6 Table 3. Delineated Wetlands within the Project Area............................................................................. 7 Table 4. Wetland Functional Assessment Results.................................................................................... 8 Table 5. Delineated Streams within the Project Area............................................................................... 9 APPENDICES APPENDIX A FIGURES Figure 1. Project Location........................................................................................................................ A-2 Figure 2. Project Location - Aerial........................................................................................................... A-3 Figure 3. USGS Topographic Map............................................................................................................ A-4 Figure 4. NRCS Soils Map......................................................................................................................... A-5 Figure 5. NWI and NHD Map..................................................................................................................... A-6 Figure 6. FEMA Flood Zones..................................................................................................................... A-7 Figure 7. Delineated Wetlands and Waterbodies.................................................................................... A-8 APPENDIX B FIELD FORMS APPENDIX C PHOTOGRAPHIC RECORD TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

Wetland and Other Waters Surveys Natrium Project 1

1.

INTRODUCTION TerraPower LLC (TerraPower), proposes to demonstrate the ability to design, license, construct, startup and operate a Natrium reactor, referred to as the Natrium Reactor Demonstration Project (Project), in Lincoln County, Wyoming. In support of Project planning and permitting requirements, Tetra Tech, Inc. (Tetra Tech), conducted a formal wetland delineation June 20th - 25th; September 1st - 2nd, and October 19th - 20th, 2022, within the 1,475-acre Project Area. The purpose of the delineation was to document current site conditions and determine the extent of wetlands and waters within the Project Area pursuant to Section 404 of the Clean Water Act (CWA) (33 U.S.C.

1344) or Section 10 of the Rivers and Harbors Act (33 U.S.C. 403). This Wetland Delineation Report summarizes the methodology and results of the field survey.

1.1 Project Background The Project will feature a 345-megawatt sodium-cooled fast reactor with a molten salt-based energy storage system that are intended to replace the aging coal-fired units in Wyomings PacifiCorp system. The Project will also include an approximately 6-mile-long transmission line and a water supply pipeline that will connect the Natrium plant to existing infrastructure at the Naughton Power Plant.

1.2 Project Area The Project area is located in Lincoln County, Wyoming, generally southeast of the existing Naughton Power Plant (Figures 1 and 2). The Project area, which encompasses approximately 1,475 acres, includes the Project site and the Transmission/Water Line Corridor. The Project site, located in Township 20N Range 116W Sections 19 and 20, includes the proposed reactor, energy storage system, and support facilities. The Transmission/Water Line Corridor extends north and northwest of the Project site. This corridor was sized to capture the full range of feasible options for the final route and encompass the extent of potential impacts that could occur during construction of this transmission line and water supply pipeline once the final route is determined.

The Project area is located within the Rolling Sagebrush Steppe (Level IV) sub-division of the Wyoming Basin Level III Ecoregion of Wyoming (Chapman et al. 2004). This vast region is dominated by shrubland communities. Typical plant species or plant associations in this region include Wyoming big sagebrush (Artemisia tridentata), western wheatgrass (Pascopyrun smithii),

needle-and-thread grass (Hesperostipa comata), rabbitbrush (Ericameria nauseosa), silver sagebrush (Artemisia cana), and Sandberg bluegrass (Poa secunda) (Chapman et al. 2004).

The Project area is situated in the gently rolling terrain of the Cumberland Flats of Wyoming at elevations ranging from about 6,735 feet to 6,770 feet above mean sea level. The area is covered by the Elkol, Wyoming and Kemmerer, Wyoming, United States Geological Survey (USGS) 7.5-minute topographic quadrangles (Figure 3).

The climate in the Project area is arid and windy, with warm summers and cold winters. Nearby monthly average temperatures range from about 16 degrees Fahrenheit (°F) in December and January to about 61°F in July and August, and maximum and minimum recorded temperatures of 99°F and -39°F, respectively (USDA 2022; NOAA 2022).

Wetland and Other Waters Surveys Natrium Project 2

2.

REGULATORY FRAMEWORK 2.1 Federal Regulations Section 404 of the CWA and Section 10 of the Rivers and Harbors Act established programs to regulate the discharge of dredged or fill material and other work in Waters of the U.S. (WOTUS),

including wetlands and other special aquatic sites. These federal laws are administered by the U.S.

Army Corps of Engineers (USACE), with the oversight of the U.S. Environmental Protection Agency (EPA). The laws regulate different types of WOTUS, but certain features are regulated by both statutes. The proposed Project is located within the boundaries of the USACE-Omaha Regulatory District.

Several classes of waterbodies are subject to federal jurisdiction under the CWA, including traditional navigable waters (TNWs); non-navigable tributaries of TNWs that are perennial or intermittent streams; and wetlands that directly abut streams (USACE 2008). In the absence of adjacent wetlands, lateral jurisdiction over nontidal waters extends to the ordinary high-water mark (OHWM). The definition of the OHWM is that line on the shore established by the fluctuations of water and indicated by physical characteristics such as a clear natural line impressed on the bank, shelving, changes in the character of soil, destruction of terrestrial vegetation, the presence of litter and debris, or other appropriate means that consider the characteristics of the surrounding areas (33 Code of Federal Regulations [CFR] 328.3[e]). Wetlands with "jurisdictional status" are WOTUS as defined by Section 404 of the CWA.

The EPA and the Office of the Assistant Secretary of the Army for Civil Works published the new WOTUS rule on December 30, 2022, which will take effect February 28, 2023. The rule is similar to the pre-2015 regime in that under most circumstances, wetlands, surface waters, and waterbodies that are relatively permanent with a continuous surface water connection or significant nexus to a relatively permanent waterbody, including traditional navigable waters, the territorial seas, and interstate waters, will be considered jurisdictional (USEPA 2022a; USEPA 2022b). A significant nexus exists when a waterbody is determined to significantly affect the chemical, physical, or biological integrity of traditional navigable waters, the territorial seas, or interstate waters. It is highly likely all the current jurisdictional features will remain jurisdictional under the new rule.

2.2 State Regulations 2.2.1 Wyoming Wetlands Act The Wyoming Wetlands Act [W.S. §§ 35-11-308 through 35-11-311] was passed by the Wyoming Legislature in 1991 and amended in 1994 (WJVSC 2010). Section 309(a) of the Act declares that all water, including collections of still water and waters associated with wetlands within the borders of this state are property of the state. The Act acknowledges that wetlands provide important habitat for waterfowl and endangered species; aid in flood control; trap, filter, and store sediments and other pollutants; and serve as groundwater recharge areas. Section 309(e) of the Act stresses the importance of balancing wetland preservation and the interests of private property owners and industry. The two key provisions of the Wyoming Wetlands Act are (1) a requirement for individuals or entities intending to drain a wetland of 5 acres or more to notify the Wyoming Department of Environmental Quality (WDEQ) in advance of any such action [Section 310], and (2)

Wetland and Other Waters Surveys Natrium Project 3

the creation of a mitigation credit banking system based on ecological functions and values of wetlands that is to be administered by WDEQ [Section 311].

2.2.2 General Permit for Wetland Mitigation The WDEQ Water Quality Division (WQD) is responsible for isolated wetlands (wetlands not under CWA Section 404 jurisdiction) and may require a general permit if isolated wetlands are disturbed by Project construction. Under the Wyoming Pollutant Discharge Elimination System (WYPDES),

this general permit for isolated wetlands mitigation authorizes the discharge of fill or dredge material into (1) naturally occurring isolated wetlands or (2) man-made isolated wetlands used to mitigate the loss of naturally occurring wetlands. This permit applies to the loss or destruction of greater than 1 cumulative acre of isolated wetland habitat for a total project. Coverage under this general permit requires a mitigation plan to offset the loss of wetland functions and values such that project activities result in no net loss of wetlands.

3.

METHODOLOGY 3.1 Desktop Review Tetra Tech biologists conducted a desktop analysis to identify potential wetlands and other waters relying mostly on readily available, existing information that was obtained through a search of publicly available sources. The datasets accessed for the study included the Natural Resources Conservation Service (NRCS) Soil Survey Geographic Database, the U.S. Fish and Wildlife Service (USFWS) National Wetlands Inventory (NWI), the U.S. Geological Survey (USGS) National Hydrography Dataset (NHD), and the Federal Emergency Management Agency (FEMA) Flood Insurance Rate Maps. In addition, Tetra Tech reviewed available geospatial data, aerial photographs, and topographic maps of the Project area to identify any potential wetlands or other waters that should be visited on the ground.

3.2 Wetland Delineation Wetland delineations were conducted in the field using the standard determination method following the U.S. Army Corps of Engineers (USACE) Wetland Delineation Manual (1987) and the Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West, Version 2.0 (USACE 2008). This manual and supplement incorporate a three-parameter approach using hydrophytic vegetation, hydric soils, and hydrology indicators to identify wetlands and WOTUS.

During the delineation, potential regulatory boundaries of wetlands and other surface waters were identified through visual assessment of wetland vegetation, hydric soils, and hydrology indicators.

Paired USACE wetland and upland sample plots were established along the delineated boundaries to further document soil characteristics, presence of hydrology indicators, and vegetative communities within the wetlands and adjacent upland areas.

Vegetative communities were evaluated based on the presence of dominant plant species and their estimated percent ground cover by four strata: tree (30-foot radius), shrub (15-foot radius),

herbaceous (5-foot radius), and woody vine (30-foot radius). The wetland indicator status was identified within the National Wetland Plant List classification system (Lichvar et al. 2016). Based on this classification system, species are classified as obligate wetland (OBL), facultative wetland TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

Wetland and Other Waters Surveys Natrium Project 4

(FACW), facultative (FAC), facultative upland (FACU), or upland (UPL) (Table 1). Vegetation that has an OBL, FACW, or FAC indicator status is considered a wetland plant.

Table 1. Wetland Indicator Status and their Percent Occurrence within Wetlands Indicator Status Percent Occurrence within Wetlands OBL: Occur almost always under natural conditions in wetlands.

99 FACW: Usually occur in wetlands but occasionally found in non-wetlands.

67-99 FAC: Equally likely to occur in wetlands and non-wetlands.

34-66 FACU: Usually occur in non-wetlands but occasionally found in wetlands.

1-33 UPL: Occur in wetlands in another region but occur almost always under natural conditions in non-wetlands in the region specified.

1 Source: Reed 1988 Soil profiles collected at each sample plot were dug to a depth of approximately 20 inches. Soil characteristics, including coloration, redoximorphic features, depth of saturation, and depth to the ground water table, were noted, in accordance with the Field Indicators of Hydric Soils in the United States (NRCS 2010). Hydrology was determined through observations of surface conditions as well as observations of saturation and presence or absence of a high-water table in the soil pit. Surface indicators include presence of surface water, evidence of recent flow, water deposited debris, and aquatic macroinvertebrates. Field-observed data were collected with the USACE Wetland Determination Data Sheets (Appendix B), in accordance with the USACE Wetland Delineation Manual (1987) and the Regional Supplement to the Corps of Engineers Wetland Delineation Manual:

Arid West, Version 2.0 (USACE 2008).

The boundaries of delineated wetlands and waters and the locations of paired upland/wetland sample plots were recorded using a submeter accuracy GPS receiver interfaced with the ArcGIS Field Maps application. Representative photographs were taken of each aquatic feature and points of interest. Photographic documentation is included in Appendix C.

3.3 Wetland Functional Assessment Tetra Tech used the Montana Wetland Assessment Method (MWAM; Berglund and McEldowney 2008) to do a functional assessment of the wetlands in the Project area (Appendix B). Depending on the specific wetland being evaluated, up to 11 functions/values can be evaluated for each Assessment Area (AA) using MWAM, including the following:

Habitat for federally listed or proposed threatened or endangered plants or animals; General wildlife habitat; General fish habitat; Flood attenuation; Long-and short-term surface water storage; Sediment/nutrient/toxicant retention and/or removal; Sediment/shoreline stabilization; Production export/terrestrial and aquatic food chain support; Groundwater discharge/recharge; TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

Wetland and Other Waters Surveys Natrium Project 5

Uniqueness; Recreation/education potential.

Functions are self-sustaining properties of a wetland ecosystem that exist in the absence of society and relate to ecological significance without regard to subjective human values. Flood attenuation is an example of a wetland function. Values are benefits that derive from either one or more functions and the physical characteristics associated with a wetland. The value of a given wetland function is based on human judgment of worth, merit, and importance (Berglund and McEldowney 2008).

The MWAM ranks wetland functions and values in four categories, from I through IV. Category I has higher functional value than Category IV. Descriptions of the categories are as follows:

Category I - Wetlands are of exceptionally high quality and are generally rare to uncommon in the state or are important from a regulatory standpoint. Category I wetlands can provide primary habitat for federally listed species or species proposed for listing; represent a high-quality example of a rare wetland type; provide irreplaceable ecological functions (i.e., not replaceable within a human lifetime, if at all); exhibit exceptionally high flood attenuation capability; or are assigned high ratings for most of the assessed functions and values.

Category II - Wetlands are more common than Category I wetlands and are those that provide habitat for sensitive plants or animals, function at very high levels for wildlife/fish habitat, are unique in a given region, or are assigned high ratings for many of the assessed functions and values.

Category III - Wetlands are more common and generally less diverse than Category I and II wetlands. They can provide many functions and values, although they may not be assigned high ratings for as many parameters as are Category I and II wetlands. To be rated as a Category III site, the site must not qualify as a Category I, II, or IV site.

Category IV - Wetlands are generally small, isolated, and lack vegetative diversity. These sites provide little in the way of wildlife habitat and are often indirectly disturbed. To be rated as a Category IV site, the AA must not qualify as a Category I, II, or III site.

3.4 Stream Delineation All stream features and other waterbodies, including drainage ditches and ponds, were identified and mapped based on the presence of an OHWM. Stream channel duration was assessed using the Streamflow Duration Assessment Method (SDAM) (Nadeau 2015). The SDAM uses indicators of streamflow duration such as presence of macroinvertebrates and wetland vegetation to classify streams as perennial, intermittent, or ephemeral. Perennial streams typically flow year-round and have a defined bed and bank. Intermittent streams have a defined stream bed and bank with a clearly defined ordinary high-water mark but do not have continuous flow. These streams flow seasonally in response to ground water height or snowmelt. In some cases, pooled water or fringe wetlands supported by shallow ground water are associated with intermittent features.

Intermittent streams stop flowing when water losses from infiltration or evaporation exceed the input. Ephemeral streams flow occasionally and in response to rainstorms. These streams may not have defined bed and banks and may be referred to as washes or gullies (IDEQ 2016).

Wetland and Other Waters Surveys Natrium Project 6

4.

RESULTS 4.1 Desktop Results 4.1.1 Soils Soils mapped by the U.S Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS) Soil Survey Geographic Database within the Project area are presented in Table 2 and Figure 4. No soils within the Project area are designated hydric.

Table 2. Soil Types within the Project Area Map Unit Name Map Symbol Hydric Soil Drainage Class Acreage Blazon-Chaperton-Fola complex, 5 to 30 percent slopes -- draft 8205 No Well drained 213.6 Cumberhill-Sandbranch-Poposhia complex, 4 to 15 percent slopes 6338 No Well drained 830.0 Dumps, mine-Pits, mine complex -- draft 801 No Not Rated 51.2 Sandbranch-Monte complex, 0 to 3 percent slopes --

draft 4071 No Well drained 358.4 Scully-Langspring complex, 2 to 10 percent slopes --

draft 4140 No Well drained 21.6 Whitesage loam, 0 to 6 percent slopes -- draft 515A No Well drained 0.1 TOTAL 1,475 Source: USDA NRCS 2021 4.1.2 Wetlands and Waters The Project area is located within the Little Muddy Creek watershed (HUC 1404010802). The North Fork of Little Muddy Creek flows south through the Project area, joining Little Muddy Creek approximately eight miles to the south. Little Muddy Creek flows east into Muddy Creek and ultimately Blacks Fork and the Flaming Gorge Reservoir.

Review of the USFWS NWI data identified several palustrine emergent (PEM) wetlands (11.1 acres),

riverine (12.0 acres), and freshwater ponds (16.8 acres) to be located within the Project area (USFWS 2022; Figure 5). The National Hydrography Dataset (NHD) identified several tributaries (approximately 32,339.3 feet) of the North Fork Little Muddy Creek (3,941.6 linear feet) (USGS 2022; Figure 5).

4.1.3 Floodplains The Federal Emergency Management Agency (FEMA) Flood Insurance Rate Map panels 56023C2015D, 56023C2230D, and 56023C2235D (effective November 16, 2011), indicate that 113.3 acres of the Project area are classified in Zone A, a Special Flood Hazard Area without determined base flood elevations and a one percent annual chance of flooding. The remaining 1,361.6 acres are classified in Zone X which includes areas of minimal flood hazard located outside of the 100-year flood (Figure 6).

Wetland and Other Waters Surveys Natrium Project 7

4.2 Field Delineation Results 4.2.1 Wetlands Results of the wetland delineation identified a total of 54.8 acres of PEM wetlands, which generally occurred along streams that flowed through sagebrush steppe and greasewood flats. Greasewood flat wetlands are characterized by white alkaline soils and very sparse vegetation (Appendix A Figure 7-5, Wetland 10). In the northern portion of the Project area, some wetlands were fed by waters that flowed out of the Kemmerer Mine (just west of the Project area) and through culverts underneath the road (Appendix A Figure 7-2, Wetland 1); other wetlands were fed directly by water that flowed out of the Naughton Power Plant (Appendix A Figure 7-2, Wetland 5).

The wetlands were largely dominated by Baltic rush (Juncus balticus), common reed (Phragmites australis), creeping bentgrass (Agrostis stolonifera), meadow foxtail (Alopecurus pratensis), Nuttall's alkali grass (Puccinellia nuttalliana), Rocky Mountain glasswort (Salicornia rubra), sagebrush (Artemisia tridentata), sedge (Carex spp.), and Utah arrowgrass (Triglochin concinna). The wetlands exhibited hydric indicators including surface water (A1), high water table (A2) saturated soils within the upper six inches (A3), and soil surface cracks (B6), and consisted of hydric soils with redoximorphic features that met the depleted matrix (F3), redox dark surface (F6), redox depressions (F8), and sandy redox (S5) indicators.

Table 3 below provides a list of all delineated wetland features, their classifications, and their areal extent within the Project area. Table 4 provides the Four Assessment Areas (AAs) that were analyzed for wetland function and value in the Project area.

Table 3.

Delineated Wetlands within the Project Area Feature Acres Cowardin Classification AA Map Page Wetland 1 10.4 Palustrine Emergent 2

2 Wetland 2 0.1 Palustrine Emergent 2

3 Wetland 3 5.6 Palustrine Emergent 2

3 Wetland 4 4.0 Palustrine Emergent 2

3 Wetland 5 0.7 Palustrine Emergent 1

2 Wetland 6 0.4 Palustrine Emergent 1

1 Wetland 7 1.3 Palustrine Emergent 3

5 Wetland 8 3.0 Palustrine Emergent 3

7 Wetland 9 7.0 Palustrine Emergent 3

6 Wetland 10 3.3 Palustrine Emergent 3

5 Wetland 11 0.05 Palustrine Emergent 3

5 Wetland 12 1.1 Palustrine Emergent 3

5 Wetland 13 16.1 Palustrine Emergent 4

8, 9 Wetland 14 1.8 Palustrine Emergent 4

7 Wetland 15 0.04 Palustrine Emergent 4

Wetland and Other Waters Surveys Natrium Project 8

Table 4.

Wetland Functional Assessment Results MWAM Function AA1 AA2 AA3 AA4 Threatened/endangered species 0

0 0

0.8 S1, S2, S3 species 0

0 0

0 Wildlife Habitat 0.5 0.5 0.5 0.5 Fish Habitat NA NA NA 0.6 Flood Attenuation NA 0.6 0.5 0.4 Surface Water Storage NA 1

1 1

Sediment/nutrient/toxicant 0.7 1

0.6 0.9 Shoreline Stabilization NA 1

1 1

Production Export 0.9 0.9 0.9 0.9 Groundwater NA NA NA NA Uniqueness 0.1 0.2 0.2 0.2 Recreation NA NA NA NA Functional Points 2.2 5.2 4.7 6.3 Functional Units 2.3 104.5 73.8 113.4 Category III III III III Paired wetland and upland USACE sample plot locations are illustrated in Figure 7 and associated USACE wetland determination data forms and MDAM forms are provided in Appendix B.

Photographs of paired plots and their respective wetlands are provided in Appendix C.

All AAs are rated as Category III, which suggests they are common, and less diverse than higher rated Category I or II wetlands. Functional units, which are the functional points multiplied by the acreage of the AA, can be used by the USACE to determine mitigation requirements should they become necessary.

4.2.2 Streams A total of 31,210.6 linear feet of streams were delineated within the Project area, including approximately 11,941.2 linear feet of perennial streams, 7,025.3 linear feet of intermittent streams, 12,244.0 linear feet of ephemeral streams. An additional 397.3 linear feet of ditch were also delineated (Figure 7).

The streams ranged from one to five feet in width. Delineated intermittent and perennial streams were observed to contain well-defined beds and banks and maintained a continuous ordinary high-water mark (Appendix B). Macroinvertebrates were observed in Streams 4, 5, 8, and 10.

Table 5 below provides a list of all delineated stream features, their flow regime, and their extent within the Project area. Representative photographs of the delineated streams are provided in Appendix C.

Wetland and Other Waters Surveys Natrium Project 9

Table 5.

Delineated Streams within the Project Area Feature Length (Feet)

Flow Regime Map Page Stream 1 724.2 Ephemeral 2

Stream 2 122.6 Ephemeral 2

Stream 4 1,196.0 Perennial 3

Stream 5 271.1 Perennial 2

Stream 7 3,324.1 Intermittent 4

Stream 8 2,085.2 Perennial 6, 7 Stream 9 791.6 Ephemeral 6

Stream 10 (North Fork Little Muddy Creek) 8,388.9 Perennial 8, 9 Stream 11 793.3 Ephemeral 9, 10 Stream 12 917.6 Ephemeral 9, 10 Stream 13 3,942.4 Ephemeral 9, 10 Stream 14 (North Fork Little Muddy Creek) 1,875.1 Intermittent 7

Stream 15 1,436.2 Ephemeral 8

Stream 16 2,725.1 Ephemeral 5, 6 Stream 17 1,826.1 Intermittent 6

Stream 18 791.0 Ephemeral 2

TOTAL 31,210.6

5.

DISCUSSION Under the new rule for the Revised Definition of Waters of the United States, published December 30, 2022, it is Tetra Techs opinion that most delineated wetlands and waters are likely considered jurisdictional WOTUS (USEPA 2022a), though many waters in the Project area have been manipulated or impounded potentially making jurisdictional determination difficult. Streams that are intermittent or perennial and wetlands that are adjacent to or whose waters are sourced from those streams are likely jurisdictional waters. Examples of these features are Stream 8 and Wetland

13. These features have perennial waters that appear to have connectivity to larger tributaries.

These classifications are preliminary and only the USACE can make the final jurisdictional determination on the delineated features.

6.

LITERATURE CITED Berglund, J., and R. McEldowney. 2008. MDT Montana Wetland Assessment Method. Prepared for Montana Department of Transportation. Helena, MT: Post, Buckley, Schuh and Jernigan. 42 p.

Chapman, S.S., S.A. Bryce, J.M. Omernik, D.G. Despain, J. ZumBerge, and M. Conrad. 2004. Ecoregions of Wyoming (color poster with map, descriptive text, summary tables, and photographs):

Reston, Virginia, U.S. Geological Survey (map scale 1:1,400,000).

Wetland and Other Waters Surveys Natrium Project 10 FEMA 2011. National Flood Hazard Layer. FIRM Panels 56023C2015D, 56023C2230D, and 56023C2235D (effective November 16, 2011). Available online at: https://hazards-fema.maps.arcgis.com/apps/webappviewer/index.html?id=8b0adb51996444d4879338b5529 aa9cd. Accessed November 2022.

IDEQ (Idaho Department of Environmental Quality). 2016. Water Body Assessment Guidance.

Available at : https://www2.deq.idaho.gov/admin/LEIA/api/document/download/14799.

Accessed June 2022.

Lichvar, R.W., D.L. Banks, W.N. Kirchner, and N.C. Melvin. 2016. The National Wetland Plant List:

2016 wetland ratings. Phytoneuron 2016-30:1-17.

Nadeau, Tracie-Lynn. 2015. Streamflow Duration Assessment Method for the Pacific Northwest.

EPA 910-K-14-001. U.S Environmental Protection Agency, Region 10, Seattle, WA.

NOAA (National Oceanic and Atmospheric Administration). 2022. NOAA Online Weather Data.

Kemmerer 2N, WY. Available online at: https://www.weather.gov/wrh/Climate?wfo=riw.

Accessed June 2022.

NRCS (Natural Resources Conservation Service). 2010. Field Indicators of Hydric Soils in the United States. Available at:

https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_053171.pdf Accessed June 2022.

NRCS 2021. USA Soils Map Units. Accessible through Esri Living Atlas. Available online at:

https://www.arcgis.com/home/item.html?id=06e5fd61bdb6453fb16534c676e1c9b9 Accessed November 2022.

Reed, P. B., Jr. 1988. National List of Plant Species that Occur in Wetlands. Washington, DC: U.S. Fish and Wildlife Service. Available online at:

https://efotg.sc.egov.usda.gov/references/Public/NE/1988_National_List_of_Plant_Species.pdf.

Accessed October 2022.

USACE (U.S. Army Corps of Engineers). 1987. U.S. Army Corps of Engineers Wetland Delineation Manual. Wetlands Research Program Technical Report Y-87-1.

USACE. 2008. Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region. Wetlands Research Program Technical Report 08-28.

USDA. 2022. AgACIS for Lincoln County. Kemmerer 2N, WY. Available online at: http://agacis.rcc-acis.org/?fips=56023. Accessed June 2022.

USEPA (U.S. Environmental Protection Agency). 2022a. Pre-publication Notice: Revised Definition of Waters of the United States. Available online at:

https://www.epa.gov/system/files/documents/2022-12/Pre-Publication%20Final%20Rule%20Notice.pdf. Accessed January 2023.

Wetland and Other Waters Surveys Natrium Project 11 USEPA. 2022b. Final Rule: Revised Definition of Waters of the United States Fact Sheet. Available online at: https://www.epa.gov/system/files/documents/2022-12/Public%20Fact%20Sheet.pdf. Accessed January 2023.

USFWS (U.S. Fish and Wildlife Service). 2022. National Wetlands Inventory. Available online at https://www.fws.gov/wetlands/Data/State-Downloads.html. Accessed June 2022.

USGS (U.S. Geological Survey). 2022. National Hydrography Dataset. Available online at: :

https://www.usgs.gov/national-hydrography/access-national-hydrography-products.

Accessed June 2022.

WJVSC (Wyoming Joint Ventures Steering Committee). 2010. Wyoming Wetlands Conservation Strategy. Available online at https://wgfd.wyo.gov/WGFD/media/content/PDF/Habitat/Habitat%20Information/Wyoming

%20Wetlands%20Conservation%20Strategy/Wyoming-Wetlands-Conservation-Strategy.pdf.

Accessed January 2023.

Wetland and Other Waters Surveys Natrium Project Appendix A A-2 Figure 1.

Wetland and Other Waters Surveys Natrium Project Appendix A A-3 Figure 2.

Wetland and Other Waters Surveys Natrium Project Appendix A A-4 Figure 3.

Wetland and Other Waters Surveys Natrium Project Appendix A A-5 Figure 4.

Wetland and Other Waters Surveys Natrium Project Appendix A A-6 Figure 5.

Wetland and Other Waters Surveys Natrium Project Appendix A A-7 Figure 6.

Wetland and Other Waters Surveys Natrium Project Appendix A A-8 Figure 7.

Wetland and Other Waters Surveys Natrium Project Appendix A A-11

73.

Wetland and Other Waters Surveys Natrium Project Appendix B APPENDIX B FIELD FORMS TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

Wetland and Other Waters Surveys Natrium Project Appendix B MONTANA WETLAND ASSESSMENT FORMS TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

MDT Montana Wetland Assessment Form (revised March 2008)

1. Project Name:

Natrium Demonstration Project

2. MDT Project #:

Control #:

AA1

3. Evaluation Date:

08/08/2022

4. Evaluator(s):

JTR

5. Wetlands/Site #(s):

wetland 5, wetland 6

6. Wetland Location(s): i. Legal: S32, T21N, R116W Latitude/Longitude: (41.75503484, -110.60195367);

ii. Approx. Stationing or Mileposts:

(41.76168122, -110.60562331) iii. Watershed:

Watershed Name, County:

Green River Basin, Lincoln

7. a. Evaluating Agency:

b. Purpose of Evaluation:

1. Wetlands potentially affected by MDT project

8. Wetland size:

1.060 acres (measured)

2. X Mitigation wetlands; pre-construction

3. Mitigation wetlands; post-construction

9. Assessment area (AA):

1.060 acres (measured)

4. Other:

10. Classification of Wetland and Aquatic Habitats in AA Abbreviations: (see manual for definitions)

HGM Class (Brinson)

Class (Cowardin)

Modifier (Cowardin)

Water Regime

% of AA D

EM A

PP 100.00 HGM Classes: Riverine (R), Depressional (D), Slope (S), Mineral Soil Flats (MSF), Organic Soil Flats (OSF), Lacustrine Fringe (LF);

Cowardin Classes: Rock Bottom (RB), Unconsolidated bottom (UB),

Aquatic Bed (AB), Unconsolidated Shore (US), Moss-lichen Wetland (ML), Emergent Wetland (EM), Scrub-Shrub Wetland (SS), Forested Wetland (FO)

Modifiers: Excavated (E), Impounded (I), Diked (D), Partly Drained (PD), Farmed (F), Artificial (A)

Water Regimes: Permanent / Perennial (PP), Seasonal / Intermittent (SI), Temporary / Ephemeral (TE)

11. Estimated relative abundance: (of similarly classified sites within the same Major Montana Watershed Basin, see definitions)

ABUNDANT

12. General condition of AA:

i. Disturbance: (use matrix below to determine [circle] appropriate response - see instructions for Montana-listed noxious weed and aquatic nuisance vegetation species (ANVS) list)

Conditions within AA Predominant conditions adjacent to (within 500 feet of) AA Managed in predominantly natural state; is not grazed, hayed, logged, or otherwise converted; does not contain roads or buildings; and noxious weed or ANVS cover is >=15%.

Land not cultivated, but may be moderately grazed or hayed or selectively logged; or has been subject to minor clearing; contains few roads or buildings; noxious weed or ANVS cover is <= 30%.

Land cultivated or heavily grazed or logged; subject to substantial fill placement, grading, clearing, or hydrological alteration; high road or building density; or noxious weed or ANVS cover is > 30%.

AA occurs and is managed in predominantly natural state; is not grazed, hayed, logged, or otherwise converted; does not contain roads or occupied buildings; and noxious weed or ANVS cover is <= 15%.

low disturbance low disturbance moderate disturbance AA not cultivated, but may be moderately grazed or hayed or selectively logged; or has been subject to relatively minor clearing, fill placement, or hydrological alteration; contains few roads or buildings; noxious weed or ANVS cover is <=

moderate disturbance moderate disturbance high disturbance AA cultivated or heavily grazed or logged; subject to relatively substantial fill placement, grading, clearing, or hydrological alteration; high road or building density; or noxious weed or ANVS cover is > 30%.

high disturbance high disturbance high disturbance Comments: (types of disturbance, intensity, season, etc.): These wetlands are sourced from waters that flow out of the Kemmerer Plant, or from water storage ponds associated with the plant ii. Prominent noxious, aquatic nuisance, & other exotic vegetation species: None observed iii. Provide brief descriptive summary of AA and surrounding land use/habitat: Adjacent land use is industrial

13. Structural Diversity: (based on number of "Cowardin" vegetated classes present [do not include unvegetated classes], see #10 above)

Existing # of Cowardin Vegetated Classes in AA Initial Rating Is current management preventing (passive) existence of additional vegetated classes?

Modified Rating

>= 3 (or 2 if 1 is forested) classes H

NA NA NA 2 (or 1 if forested) classes M

NA NA NA 1 class, but not a monoculture M

<-- NO YES -->

L 1 class, monoculture (1 species comprises >= 90% of total cover)

L NA NA NA Comments: Veg class is herbaceous 1

SECTION PERTAINING to FUNCTIONS & VALUES ASSESSMENT 14A. Habitat for Federally Listed or Proposed Threatened or Endangered Plants or Animals:

i. AA is Documented (D) or Suspected (S) to contain (circle one based on definitions contained in instructions):

No usable habitat Primary or critical habitat (list species)

Secondary habitat (list species)

Incidental habitat (list species) ii. Rating (use the conclusions from i above and the matrix below to arrive at [circle] the functional points and rating)

Highest Habitat Level doc/primary sus/primary doc/secondary sus/secondary doc/incidental sus/incidental None Functional Points and Rating 1H

.9H

.8M

.7M

.3L

.1L 0L Sources for documented use (e.g. observations, records, etc): NA 14B. Habitat for plant or animals rated S1, S2, or S3 by the Montana Natural Heritage Program: (not including species listed in14A above)

i. AA is Documented (D) or Suspected (S) to contain (circle one based on definitions contained in instructions):

No usable habitat Primary or critical habitat (list species)

Secondary habitat (list species)

Incidental habitat (list species) ii. Rating (use the conclusions from i above and the matrix below to arrive at [circle] the functional points and rating)

Highest Habitat Level doc/primary sus/primary doc/secondary sus/secondary doc/incidental sus/incidental None S1 Species: Functional Points and Rating 1H

.8H

.7M

.6M

.2L

.1L 0L S2 and S3 Species: Functional Points and Rating

.9H

.7M

.6M

.5M

.2L

.1L 0L Sources for documented use (e.g. observations, records, etc): NA 14C. General Wildlife Habitat Rating:

i. Evidence of overall wildlife use in the AA (circle substantial, moderate, or low based on supporting evidence):

Substantial (based on any of the following [check]):

Minimal (based on any of the following [check]):

observations of abundant wildlife #s or high species diversity (during any period) few or no wildlife observations during peak use periods abundant wildlife sign such as scat, tracks, nest structures, game trails, etc.

little to no wildlife sign presence of extremely limiting habitat features not available in the surrounding area sparse adjacent upland food sources interviews with local biologists with knowledge of the AA interviews with local biologists with knowledge of the AA Moderate (based on any of the following [check]):

X observations of scattered wildlife groups or individuals or relatively few species during peak periods common occurrence of wildlife sign such as scat, tracks, nest structures, game trails, etc.

adequate adjacent upland food sources interviews with local biologists with knowledge of the AA ii. Wildlife habitat features (Working from top to bottom, circle appropriate AA attributes in matrix to arrive at rating. Structural diversity is from #13. For class cover to be considered evenly distributed, the most and least prevalent vegetated classes must be within 20% of each other interms of their percent composition of the AA (see #10). Abbreviations for surface water durations are as follows: P/P = permanent/perennial; S/I = seasonal/intermittent; T/E =

temporary/ephemeral; and A = absent [see instructions for further definitions of these terms])

Structural diversity (see #13)

High Moderate Low Class cover distribution (all vegetated classes)

Even Uneven Even Uneven Even Duration of surface water in

>=10% of AA P/P S/I T/E A

P/P S/I T/E A

Low disturbance at AA (see

12i)

E E

E H

E E

H H

E H

H M

E H

M M

E H

M M

Moderate disturbance at AA (see #12i)

H H

H M

H H

M M

H M

M L

H M

L L

High disturbance at AA (see

12i)

M M

M L

M M

L L

M M

L L

M L

L L

iii. Rating (use the conclusions from i and ii above and the matrix below to arrive at [circle] the functional points and rating)

Evidence of wildlife use (i)

Wildlife habitat features rating (ii)

Exceptional High Moderate Moderate Substantial 1E

.9H

.8H

.7M Moderate

.9H

.7M

.5M

.3L Minimal

.6M

.4M

.2L

.1L Comments:

Bobcat and pronghorn observed 2

14D. General Fish Habitat Rating: (Assess this function if the AA is used by fish or the existing situation is correctable such that the AA could be used by fish [i.e., fish use is precluded by perched culvert or other barrier, etc.]. If the AA is not used by fish, fish use is not restorable due to habitat constraints, or is not desired from a management perspective [such as fish entrapped in a canal], then mark X NA and proceed to 14E.)

Type of Fishery:

Cold Water (CW)

Warm Water (WW)

Use the CW or WW guidelines in the user manual to complete the matrix

i. Habitat Quality and Known / Suspected Fish Species in AA (use matrix to arrive at [circle] the functional points and rating)

Duration of surface water in AA Permanent / Perennial Seasonal / Intermittent Temporary / Ephemeral Aquatic hiding / resting /

escape cover Optimal Adequate Poor Optimal Adequate Poor Optimal Adequate Poor Thermal cover optimal /

suboptimal O

S O

S FWP Tier I fish species 1E

.9H

.8H

.7M

.6M

.5M

.9H

.8H

.7M

.6M

.5M

.4M

.7M

.6M

.5M

.4M

.3L

.2L FWP Tier II or Native Game fish species

.9H

.8H

.7M

.6M

.5M

.8H

.7M

.6M

.5M

.4M

.6M

.5M

.4M

.3L

.2L

.2L FWP Tier III or Introduced Game fish

.8H

.7M

.6M

.5M

.4M

.7M

.6M

.5M

.4M

.3L

.5M

.4M

.3L

.2L

.1L FWP Non-Game Tier IV or No fish species

.5M

.4M

.3L

.4M

.3L

.2L

.1L

.1L Sources used for identifying fish sp. potentially found in AA:

ii. Modified Rating (NOTE: Modified score cannot exceed 1 or be less than 0.1) a) Is fish use of the AA significantly reduced by a culvert, dike, or other man-made structure or activity or is the waterbody included on the current final MDEQ list of waterbodies in need of TMDL development with listed Probable Impaired Uses including cold or warm water fishery or aquatic life support, or do aquatic nuisance plant or animal species (see Appendix E) occur in fish habitat?

If yes, reduce score in i above by 0.1.

b) Does the AA contain a documented spawning area or other critical habitat feature (i.e., sanctuary pool, upwelling area, etc.- specify in comments) for native fish or introduced game fish? If yes, add 0.1 to the adjusted score in i or iia.

iii. Final Score and Rating:

NA Comments:

NA 14E. Flood Attenuation: (Applies only to wetlands subject to flooding via in-channel or overbank flow. If wetlands in AA are not flooded from in-channel or overbank flow, mark X NA and proceed to 14F.)

i. Rating (working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating)

Estimated or Calculated Entrenchment (Rosgen 1994, 1996)

Slightly entrenched - C, D, E stream types Moderately entrenched - B stream type Entrenched-A, F, G stream types

% of flooded wetland classified as forested and/or scrub/shrub 75%

25-75%

<25%

75%

25-75%

<25%

75%

25-75%

<25%

AA contains no outlet or restricted outlet 1H

.9H

.6M

.8H

.7M

.5M

.4M

.3L

.2L AA contains unrestricted outlet

.9H

.8H

.5M

.7M

.6M

.4M

.3L

.2L

.1L Entrenchment ratio (ER) estimation - see Users Manual for additional guidance. Entrenchment ratio = (flood-prone width)/(bankfull width) Flood-prone width = estimated horizontal projection of where 2 x maximum bankfull depth elevation intersects the floodplain on each side of the stream.

/

=

Flood-prone width Bankfull width Entrenchment ratio (ER)

Slightly Entrenched ER = >2.2 Moderately Entrenched ER = 1.41 - 2.2 Entrenched ER = 1.0 - 1.4 C stream type D stream type E stream type B stream type A stream type F stream type G stream type ii. Are 10 acres of wetland in the AA subject to flooding AND are man-made features which may be significantly damaged by floods located within 0.5 mile downstream of the AA (circle)?

Comments:

Unlikely that flow would fluctuate enough from man made sources to flood 3

14F. Short and Long Term Surface Water Storage: (Applies to wetlands that flood or pond from overbank or in-channel flow, precipitation, upland surface flow, or groundwater flow. If no wetlands in the AA are subject to flooding or ponding, mark X NA and proceed to 14G.)

i. Rating (Working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating. Abbreviations for surface water durations are as follows: P/P = permanent/perennial; S/I = seasonal/intermittent; and T/E = temporary/ephemeral [see instructions for further definitions of these terms].)

Estimated maximum acre feet of water contained in wetlands within the AA that are subject to periodic flooding or ponding

>5 acre feet 1.1 to 5 acre feet

<=1 acre foot Duration of surface water at wetlands within the AA P/P S/I T/E P/P S/I T/E P/P S/I T/E Wetlands in AA flood or pond >= 5 out of 10 years 1H

.9H

.8H

.6M

.5M

.4M

.3L

.2L Wetlands in AA flood or pond < 5 out of 10 years

.9H

.8H

.7M

.5M

.4M

.3L

.2L

.1L Comments: NA 14G. Sediment/Nutrient/Toxicant Retention and Removal: (Applies to wetlands with potential to receive sediments, nutrients, or toxicants through influx of surface or ground water or direct input. If no wetlands in the AA are subject to such input, mark NA and proceed to 14H.)

i. Rating Sediment, nutrient, and toxicant input levels within AA AA receives or surrounding land use with potential to deliver levels of sediments, nutrients, or compounds at levels such that other functions are not substantially impaired. Minor sedimentation, sources of nutrients or toxicants, or signs of eutrophication present.

Waterbody on MDEQ list of waterbodies in need of TMDL development for probable causes related to sediment, nutrients, or toxicants or AA receives or surrounding land use with potential to deliver high levels of sediments, nutrients, or compounds such that other functions are substantially impaired. Major sedimentation, sources of nutrients or toxicants, or signs of eutrophication present.

% cover of wetland vegetation in AA

>= 70%

< 70%

>= 70%

< 70%

Evidence of flooding / ponding in AA Yes No Yes No Yes No Yes No AA contains no or restricted outlet 1H

.8H

.7M

.5M

.4M

.3L

.2L AA contains unrestricted outlet

.9H

.7M

.6M

.4M

.3L

.2L

.1L Comments: Wetland 6 is sourced form water from the plant that may contain pollutants.

14H Sediment/Shoreline Stabilization: (Applies only if AA occurs on or within the banks or a river, stream, or other natural or man-made drainage, or on the shoreline of a standing water body which is subject to wave action. If 14H does not apply, mark X NA and proceed to 14I.)

i. Rating (working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating)

% Cover of wetland streambank or shoreline by species with stability ratings of >=6 (see Appendix F).

Duration of surface water adjacent to rooted vegetation Permanent / Perennial Seasonal / Intermittent Temporary / Ephemeral

>= 65%

1H

.9H

.7M 35-64%

.7M

.6M

.5M 35%

.3L

.2L

.1L Comments: Minimal flow in the channelized wetland and no wave motion in the wetland adjacent to the pond.

14I. Production Export/Food Chain Support:

i. Level of Biological Activity (synthesis of wildlife and fish habitat ratings [circle])

General Fish Habitat Rating (14D.iii.)

General Wildlife Habitat Rating (14C.iii.)

E/H M

L E/H H

H M

M H

M M

L M

M L

N/A H

M L

ii. Rating (Working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating. Factor A = acreage of vegetated wetland component in the AA; Factor B = level of biological activity rating from above (14I.i.); Factor C = whether or not the AA contains a surface or subsurface outlet; the final three rows pertain to duration of surface water in the AA, where P/P, S/I, and T/E are as previously defined, and A = absent [see instructions for further definitions of these terms].)

A Vegetated component >5 acres Vegetated component 1-5 acres Vegetated component < 1 acre B

High Moderate Low High Moderate Low High Moderate Low C

Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No P/P 1H

.7M

.8H

.5M

.6M

.4M

.9H

.6M

.7M

.4M

.5M

.3L

.8H

.6M

.4M

.3L

.2L S/I

.9H

.6M

.7M

.4M

.5M

.3L

.8H

.5M

.6M

.3L

.4M

.2L

.7M

.5M

.3L

.2L T/E/A

.8H

.5M

.6M

.3L

.4M

.2L

.7M

.4M

.5M

.2L

.3L

.1L

.6M

.4M

.2L

.1L iii. Modified Rating (NOTE: Modified score cannot exceed 1 or be less than 0.1.) Vegetated Upland Buffer (VUB): Area with >= 30% plant cover, = 15%

noxious weed or ANVS cover, and that is not subjected to periodic mechanical mowing or clearing (unless for weed control).

a) Is there an average >= 50 foot-wide vegetated upland buffer around >= 75% of the AA circumference? X If yes, add 0.1 to the score in ii above.

iv. Final Score and Rating:

0.90H Comments: NA 4

14J. Groundwater Discharge/Recharge: (check the appropriate indicators in i & ii below)

i. Discharge Indicators ii. Recharge Indicators The AA is a slope wetland Permeable substrate present without underlying impeding layer Springs or seeps are known or observed Wetland contains inlet but no outlet Vegetation growing during dormant season/drought Stream is a known losing stream; discharge volume decreases Wetland occurs at the toe of a natural slope Other:

AA permanently flooded during drought periods Wetland contains an outlet, but no inlet Shallow water table and the site is saturated to the surface Other:

iii. Rating (use the information from i and ii above and the table below to arrive at [circle] the functional points and rating)

Criteria Duration of saturation at AA Wetlands FROM GROUNDWATER DISCHARGE OR WITH WATER THAT IS RECHARGING THE GROUNDWATER SYSTEM P/P S/I T

None Groundwater Discharge or Recharge 1H

.7M

.4M

.1L Insufficient Data/Information N/A Comments: NA 14K. Uniqueness:

i. Rating (working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating)

Replacement potential AA contains fen, bog, warm springs or mature (>80 yr-old) forested wetland or plant association listed as S1 by the MTNHP AA does not contain previously cited rare types and structural diversity

(#13) is high or contains plant association listed as S2 by the MTNHP AA does not contain previously cited rare types or associations and structural diversity (#13) is low-moderate Estimated relative abundance (#11) rare common abundant rare common abundant rare common abundant Low disturbance at AA (#12i) 1H

.9H

.8H

.6M

.5M

.4M

.3L Moderate disturbance at AA (#12i)

.9H

.8H

.7M

.5M

.4M

.3L

.2L High disturbance at AA (#12i)

.8H

.7M

.6M

.4M

.3L

.2L

.1L Comments: NA 14L. Recreation/Education Potential: (affords bonus points if AA provides recreation or education opportunity)

i. Is the AA a known or potential rec./ed. site: (circle)

(if Yes continue with the evaluation; if No then mark X NA and proceed to the overall summary and rating page) ii. Check categories that apply to the AA:

Educational/scientific study; Consumptive rec.;

Non-consumptive rec.;

Other :

iii. Rating:

Known or Potential Recreation or Education Area Known Potential Public ownership or public easement with general public access (no permission required)

.2H

.15H Private ownership with general public access (no permission required)

.15H

.1M Private or public ownership without general public access, or requiring permission for public access

.1M

.05L Comments: Location next to the plant makes recreational potential low General Site Notes NA 5

FUNCTION & VALUE

SUMMARY

& OVERALL RATING FOR WETLAND/SITE #(S):

wetland 5, wetland 6 Function & Value Variables Rating Actual Functional Points Possible Functional Points Functional Units: (Actual Points x Wetland Acreage)

Indicate the four most prominent functions with an asterisk (*)

A.

Listed/Proposed T&E Species Habitat L

0.00 1

0.00 B. MT Natural Heritage Program Species Habitat L

0.00 1

0.00 C. General Wildlife Habitat M

0.50 1

0.53 D. General Fish Habitat NA E. Flood Attenuation NA F. Short and Long Term Surface Water Storage NA G. Sediment/Nutrient/Toxicant Removal M

0.70 1

0.74 H. Sediment/Shoreline Stabilization NA I. Production Export/Food Chain Support H

0.90 1

0.95 J. Groundwater Discharge/Recharge NA K. Uniqueness L

0.10 1

0.11 L. Recreation/Education Potential (bonus points)

NA Totals:

2.20 6.00 2.33 Percent of Possible Score 37%

Category I Wetland: (must satisfy one of the following criteria; otherwise go to Category II)

Score of 1 functional point for Listed/Proposed Threatened or Endangered Species; or Score of 1 functional point for Uniqueness; or Score of 1 functional point for Flood Attenuation and answer to Question 14E.ii is "yes"; or Percent of possible score > 80% (round to nearest whole #).

Category II Wetland: (Criteria for Category I not satisfied and meets any one of the following criteria; otherwise go to Category IV)

Score of 1 functional point for MT Natural Heritage Program Species Habitat; or Score of.9 or 1 functional point for General Wildlife Habitat; or Score of.9 or 1 functional point for General Fish Habitat; or "High" to Exceptional ratings for both General Wildlife Habitat and General Fish/Aquatic Habitat; or Score of.9 functional point for Uniqueness; or Percent of possible score > 65% (round to nearest whole #).

Category III Wetland: (Criteria for Categories I, II, or IV not satisfied)

Category IV Wetland: (Criteria for Categories I or II are not satisfied and all of the following criteria are met; otherwise go to Category III)

X "Low" rating for Uniqueness; and Vegetated wetland component 1 acre (do not include upland vegetated buffer); and Percent of possible score 35% (round to nearest whole #).

OVERALL ANALYSIS AREA RATING:

III Summary Comments: NA 6

MDT Montana Wetland Assessment Form (revised March 2008)

1. Project Name:

Natrium Demonstration Project

2. MDT Project #:

Control #:

AA2

3. Evaluation Date:

08/08/2022

4. Evaluator(s):

JTR

5. Wetlands/Site #(s):

wetland 1, wetland 2, wetland 3, wetland 4

6. Wetland Location(s): i. Legal: S32, T21N, R116W Latitude/Longitude:

ii. Approx. Stationing or Mileposts:

(41.75154763, -110.60690983);

(41.74823971, -110.6037396);

(41.74437091, -110.60288015);

(41.7391396, -110.60048256) iii. Watershed:

Watershed Name, County:

Green River Basin, Lincoln

7. a. Evaluating Agency:

b. Purpose of Evaluation:

1. Wetlands potentially affected by MDT project

2. X Mitigation wetlands; pre-construction

8. Wetland size:

20.100 acres (measured)

3. Mitigation wetlands; post-construction

9. Assessment area (AA):

20.100 acres (measured)

4. Other:

10. Classification of Wetland and Aquatic Habitats in AA Abbreviations: (see manual for definitions)

HGM Class (Brinson)

Class (Cowardin)

Modifier (Cowardin)

Water Regime

% of AA D

EM I

PP 100.00 HGM Classes: Riverine (R), Depressional (D), Slope (S), Mineral Soil Flats (MSF), Organic Soil Flats (OSF), Lacustrine Fringe (LF);

Cowardin Classes: Rock Bottom (RB), Unconsolidated bottom (UB),

Aquatic Bed (AB), Unconsolidated Shore (US), Moss-lichen Wetland (ML), Emergent Wetland (EM), Scrub-Shrub Wetland (SS), Forested Wetland (FO)

Modifiers: Excavated (E), Impounded (I), Diked (D), Partly Drained (PD), Farmed (F), Artificial (A)

Water Regimes: Permanent / Perennial (PP), Seasonal / Intermittent (SI), Temporary / Ephemeral (TE)

11. Estimated relative abundance: (of similarly classified sites within the same Major Montana Watershed Basin, see definitions)

COMMON

12. General condition of AA:

i. Disturbance: (use matrix below to determine [circle] appropriate response - see instructions for Montana-listed noxious weed and aquatic nuisance vegetation species (ANVS) list)

Conditions within AA Predominant conditions adjacent to (within 500 feet of) AA Managed in predominantly natural state; is not grazed, hayed, logged, or otherwise converted; does not contain roads or buildings; and noxious weed or ANVS cover is >=15%.

Land not cultivated, but may be moderately grazed or hayed or selectively logged; or has been subject to minor clearing; contains few roads or buildings; noxious weed or ANVS cover is <= 30%.

Land cultivated or heavily grazed or logged; subject to substantial fill placement, grading, clearing, or hydrological alteration; high road or building density; or noxious weed or ANVS cover is > 30%.

AA occurs and is managed in predominantly natural state; is not grazed, hayed, logged, or otherwise converted; does not contain roads or occupied buildings; and noxious weed or ANVS cover is <= 15%.

low disturbance low disturbance moderate disturbance AA not cultivated, but may be moderately grazed or hayed or selectively logged; or has been subject to relatively minor clearing, fill placement, or hydrological alteration; contains few roads or buildings; noxious weed or ANVS cover is <=

moderate disturbance moderate disturbance high disturbance AA cultivated or heavily grazed or logged; subject to relatively substantial fill placement, grading, clearing, or hydrological alteration; high road or building density; or noxious weed or ANVS cover is > 30%.

high disturbance high disturbance high disturbance Comments: (types of disturbance, intensity, season, etc.): Wetlands are located in a basin between a mine and a power plant. Water for these wetlands flows from the mine to the west through culverts, then via overland or channelized flow.

ii. Prominent noxious, aquatic nuisance, & other exotic vegetation species: None observed iii. Provide brief descriptive summary of AA and surrounding land use/habitat: Adjacent land use is industrial

13. Structural Diversity: (based on number of "Cowardin" vegetated classes present [do not include unvegetated classes], see #10 above)

Existing # of Cowardin Vegetated Classes in AA Initial Rating Is current management preventing (passive) existence of additional vegetated classes?

Modified Rating

>= 3 (or 2 if 1 is forested) classes H

NA NA NA 2 (or 1 if forested) classes M

NA NA NA 1 class, but not a monoculture M

<-- NO YES -->

L 1 class, monoculture (1 species comprises >= 90% of total cover)

L NA NA NA Comments: Veg class is herbaceous 1

SECTION PERTAINING to FUNCTIONS & VALUES ASSESSMENT 14A. Habitat for Federally Listed or Proposed Threatened or Endangered Plants or Animals:

i. AA is Documented (D) or Suspected (S) to contain (circle one based on definitions contained in instructions):

No usable habitat Primary or critical habitat (list species)

Secondary habitat (list species)

Incidental habitat (list species) ii. Rating (use the conclusions from i above and the matrix below to arrive at [circle] the functional points and rating)

Highest Habitat Level doc/primary sus/primary doc/secondary sus/secondary doc/incidental sus/incidental None Functional Points and Rating 1H

.9H

.8M

.7M

.3L

.1L 0L Sources for documented use (e.g. observations, records, etc): NA 14B. Habitat for plant or animals rated S1, S2, or S3 by the Montana Natural Heritage Program: (not including species listed in14A above)

i. AA is Documented (D) or Suspected (S) to contain (circle one based on definitions contained in instructions):

No usable habitat Primary or critical habitat (list species)

Secondary habitat (list species)

Incidental habitat (list species) ii. Rating (use the conclusions from i above and the matrix below to arrive at [circle] the functional points and rating)

Highest Habitat Level doc/primary sus/primary doc/secondary sus/secondary doc/incidental sus/incidental None S1 Species: Functional Points and Rating 1H

.8H

.7M

.6M

.2L

.1L 0L S2 and S3 Species: Functional Points and Rating

.9H

.7M

.6M

.5M

.2L

.1L 0L Sources for documented use (e.g. observations, records, etc): NA 14C. General Wildlife Habitat Rating:

i. Evidence of overall wildlife use in the AA (circle substantial, moderate, or low based on supporting evidence):

Substantial (based on any of the following [check]):

Minimal (based on any of the following [check]):

observations of abundant wildlife #s or high species diversity (during any period) few or no wildlife observations during peak use periods abundant wildlife sign such as scat, tracks, nest structures, game trails, etc.

little to no wildlife sign presence of extremely limiting habitat features not available in the surrounding area sparse adjacent upland food sources interviews with local biologists with knowledge of the AA interviews with local biologists with knowledge of the AA Moderate (based on any of the following [check]):

X observations of scattered wildlife groups or individuals or relatively few species during peak periods common occurrence of wildlife sign such as scat, tracks, nest structures, game trails, etc.

adequate adjacent upland food sources interviews with local biologists with knowledge of the AA ii. Wildlife habitat features (Working from top to bottom, circle appropriate AA attributes in matrix to arrive at rating. Structural diversity is from #13. For class cover to be considered evenly distributed, the most and least prevalent vegetated classes must be within 20% of each other interms of their percent composition of the AA (see #10). Abbreviations for surface water durations are as follows: P/P = permanent/perennial; S/I = seasonal/intermittent; T/E =

temporary/ephemeral; and A = absent [see instructions for further definitions of these terms])

Structural diversity (see #13)

High Moderate Low Class cover distribution (all vegetated classes)

Even Uneven Even Uneven Even Duration of surface water in

>=10% of AA P/P S/I T/E A

P/P S/I T/E A

Low disturbance at AA (see

12i)

E E

E H

E E

H H

E H

H M

E H

M M

E H

M M

Moderate disturbance at AA (see #12i)

H H

H M

H H

M M

H M

M L

H M

L L

High disturbance at AA (see

12i)

M M

M L

M M

L L

M M

L L

M L

L L

iii. Rating (use the conclusions from i and ii above and the matrix below to arrive at [circle] the functional points and rating)

Evidence of wildlife use (i)

Wildlife habitat features rating (ii)

Exceptional High Moderate Moderate Substantial 1E

.9H

.8H

.7M Moderate

.9H

.7M

.5M

.3L Minimal

.6M

.4M

.2L

.1L Comments:

Bobcat and pronghorn observed. See TVES report for detailed wildlife sightings.

14D. General Fish Habitat Rating: (Assess this function if the AA is used by fish or the existing situation is correctable such that the AA could be used by fish [i.e., fish use is precluded by perched culvert or other barrier, etc.]. If the AA is not used by fish, fish use is not restorable due to habitat constraints, or is not desired from a management perspective [such as fish entrapped in a canal], then mark X NA and proceed to 14E.)

Type of Fishery:

Cold Water (CW)

Warm Water (WW)

Use the CW or WW guidelines in the user manual to complete the matrix

i. Habitat Quality and Known / Suspected Fish Species in AA (use matrix to arrive at [circle] the functional points and rating)

Duration of surface water in AA Permanent / Perennial Seasonal / Intermittent Temporary / Ephemeral Aquatic hiding / resting /

escape cover Optimal Adequate Poor Optimal Adequate Poor Optimal Adequate Poor Thermal cover optimal /

suboptimal O

S O

S FWP Tier I fish species 1E

.9H

.8H

.7M

.6M

.5M

.9H

.8H

.7M

.6M

.5M

.4M

.7M

.6M

.5M

.4M

.3L

.2L FWP Tier II or Native Game fish species

.9H

.8H

.7M

.6M

.5M

.8H

.7M

.6M

.5M

.4M

.6M

.5M

.4M

.3L

.2L

.2L FWP Tier III or Introduced Game fish

.8H

.7M

.6M

.5M

.4M

.7M

.6M

.5M

.4M

.3L

.5M

.4M

.3L

.2L

.1L FWP Non-Game Tier IV or No fish species

.5M

.4M

.3L

.4M

.3L

.2L

.1L

.1L Sources used for identifying fish sp. potentially found in AA:

ii. Modified Rating (NOTE: Modified score cannot exceed 1 or be less than 0.1) a) Is fish use of the AA significantly reduced by a culvert, dike, or other man-made structure or activity or is the waterbody included on the current final MDEQ list of waterbodies in need of TMDL development with listed Probable Impaired Uses including cold or warm water fishery or aquatic life support, or do aquatic nuisance plant or animal species (see Appendix E) occur in fish habitat?

If yes, reduce score in i above by 0.1.

b) Does the AA contain a documented spawning area or other critical habitat feature (i.e., sanctuary pool, upwelling area, etc.- specify in comments) for native fish or introduced game fish? If yes, add 0.1 to the adjusted score in i or iia.

iii. Final Score and Rating:

NA Comments:

NA 14E. Flood Attenuation: (Applies only to wetlands subject to flooding via in-channel or overbank flow. If wetlands in AA are not flooded from in-channel or overbank flow, mark NA and proceed to 14F.)

i. Rating (working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating)

Estimated or Calculated Entrenchment (Rosgen 1994, 1996)

Slightly entrenched - C, D, E stream types Moderately entrenched - B stream type Entrenched-A, F, G stream types

% of flooded wetland classified as forested and/or scrub/shrub 75%

25-75%

<25%

75%

25-75%

<25%

75%

25-75%

<25%

AA contains no outlet or restricted outlet 1H

.9H

.6M

.8H

.7M

.5M

.4M

.3L

.2L AA contains unrestricted outlet

.9H

.8H

.5M

.7M

.6M

.4M

.3L

.2L

.1L Entrenchment ratio (ER) estimation - see Users Manual for additional guidance. Entrenchment ratio = (flood-prone width)/(bankfull width) Flood-prone width = estimated horizontal projection of where 2 x maximum bankfull depth elevation intersects the floodplain on each side of the stream.

270 feet /

3 feet =

90.00 Flood-prone width Bankfull width Entrenchment ratio (ER)

Slightly Entrenched ER = >2.2 Moderately Entrenched ER = 1.41 - 2.2 Entrenched ER = 1.0 - 1.4 C stream type D stream type E stream type B stream type A stream type F stream type G stream type ii. Are 10 acres of wetland in the AA subject to flooding AND are man-made features which may be significantly damaged by floods located within 0.5 mile downstream of the AA (circle)?

Comments:

Channelized flow enters the wetland from the west 3

14F. Short and Long Term Surface Water Storage: (Applies to wetlands that flood or pond from overbank or in-channel flow, precipitation, upland surface flow, or groundwater flow. If no wetlands in the AA are subject to flooding or ponding, mark NA and proceed to 14G.)

i. Rating (Working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating. Abbreviations for surface water durations are as follows: P/P = permanent/perennial; S/I = seasonal/intermittent; and T/E = temporary/ephemeral [see instructions for further definitions of these terms].)

Estimated maximum acre feet of water contained in wetlands within the AA that are subject to periodic flooding or ponding

>5 acre feet 1.1 to 5 acre feet

<=1 acre foot Duration of surface water at wetlands within the AA P/P S/I T/E P/P S/I T/E P/P S/I T/E Wetlands in AA flood or pond >= 5 out of 10 years 1H

.9H

.8H

.6M

.5M

.4M

.3L

.2L Wetlands in AA flood or pond < 5 out of 10 years

.9H

.8H

.7M

.5M

.4M

.3L

.2L

.1L Comments: NA 14G. Sediment/Nutrient/Toxicant Retention and Removal: (Applies to wetlands with potential to receive sediments, nutrients, or toxicants through influx of surface or ground water or direct input. If no wetlands in the AA are subject to such input, mark NA and proceed to 14H.)

i. Rating Sediment, nutrient, and toxicant input levels within AA AA receives or surrounding land use with potential to deliver levels of sediments, nutrients, or compounds at levels such that other functions are not substantially impaired. Minor sedimentation, sources of nutrients or toxicants, or signs of eutrophication present.

Waterbody on MDEQ list of waterbodies in need of TMDL development for probable causes related to sediment, nutrients, or toxicants or AA receives or surrounding land use with potential to deliver high levels of sediments, nutrients, or compounds such that other functions are substantially impaired. Major sedimentation, sources of nutrients or toxicants, or signs of eutrophication present.

% cover of wetland vegetation in AA

>= 70%

< 70%

>= 70%

< 70%

Evidence of flooding / ponding in AA Yes No Yes No Yes No Yes No AA contains no or restricted outlet 1H

.8H

.7M

.5M

.4M

.3L

.2L AA contains unrestricted outlet

.9H

.7M

.6M

.4M

.3L

.2L

.1L Comments: Sediments are likely received from adjacent industrial use 14H Sediment/Shoreline Stabilization: (Applies only if AA occurs on or within the banks or a river, stream, or other natural or man-made drainage, or on the shoreline of a standing water body which is subject to wave action. If 14H does not apply, mark NA and proceed to 14I.)

i. Rating (working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating)

% Cover of wetland streambank or shoreline by species with stability ratings of >=6 (see Appendix F).

Duration of surface water adjacent to rooted vegetation Permanent / Perennial Seasonal / Intermittent Temporary / Ephemeral

>= 65%

1H

.9H

.7M 35-64%

.7M

.6M

.5M 35%

.3L

.2L

.1L Comments: NA 14I. Production Export/Food Chain Support:

i. Level of Biological Activity (synthesis of wildlife and fish habitat ratings [circle])

General Fish Habitat Rating (14D.iii.)

General Wildlife Habitat Rating (14C.iii.)

E/H M

L E/H H

H M

M H

M M

L M

M L

N/A H

M L

ii. Rating (Working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating. Factor A = acreage of vegetated wetland component in the AA; Factor B = level of biological activity rating from above (14I.i.); Factor C = whether or not the AA contains a surface or subsurface outlet; the final three rows pertain to duration of surface water in the AA, where P/P, S/I, and T/E are as previously defined, and A = absent [see instructions for further definitions of these terms].)

A Vegetated component >5 acres Vegetated component 1-5 acres Vegetated component < 1 acre B

High Moderate Low High Moderate Low High Moderate Low C

Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No P/P 1H

.7M

.8H

.5M

.6M

.4M

.9H

.6M

.7M

.4M

.5M

.3L

.8H

.6M

.4M

.3L

.2L S/I

.9H

.6M

.7M

.4M

.5M

.3L

.8H

.5M

.6M

.3L

.4M

.2L

.7M

.5M

.3L

.2L T/E/A

.8H

.5M

.6M

.3L

.4M

.2L

.7M

.4M

.5M

.2L

.3L

.1L

.6M

.4M

.2L

.1L iii. Modified Rating (NOTE: Modified score cannot exceed 1 or be less than 0.1.) Vegetated Upland Buffer (VUB): Area with >= 30% plant cover, = 15%

noxious weed or ANVS cover, and that is not subjected to periodic mechanical mowing or clearing (unless for weed control).

a) Is there an average >= 50 foot-wide vegetated upland buffer around >= 75% of the AA circumference? X If yes, add 0.1 to the score in ii above.

iv. Final Score and Rating:

0.90H Comments: NA 4

14J. Groundwater Discharge/Recharge: (check the appropriate indicators in i & ii below)

i. Discharge Indicators ii. Recharge Indicators The AA is a slope wetland Permeable substrate present without underlying impeding layer Springs or seeps are known or observed Wetland contains inlet but no outlet Vegetation growing during dormant season/drought Stream is a known losing stream; discharge volume decreases Wetland occurs at the toe of a natural slope Other:

AA permanently flooded during drought periods Wetland contains an outlet, but no inlet Shallow water table and the site is saturated to the surface Other:

iii. Rating (use the information from i and ii above and the table below to arrive at [circle] the functional points and rating)

Criteria Duration of saturation at AA Wetlands FROM GROUNDWATER DISCHARGE OR WITH WATER THAT IS RECHARGING THE GROUNDWATER SYSTEM P/P S/I T

None Groundwater Discharge or Recharge 1H

.7M

.4M

.1L Insufficient Data/Information N/A Comments: NA 14K. Uniqueness:

i. Rating (working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating)

Replacement potential AA contains fen, bog, warm springs or mature (>80 yr-old) forested wetland or plant association listed as S1 by the MTNHP AA does not contain previously cited rare types and structural diversity

(#13) is high or contains plant association listed as S2 by the MTNHP AA does not contain previously cited rare types or associations and structural diversity (#13) is low-moderate Estimated relative abundance (#11) rare common abundant rare common abundant rare common abundant Low disturbance at AA (#12i) 1H

.9H

.8H

.6M

.5M

.4M

.3L Moderate disturbance at AA (#12i)

.9H

.8H

.7M

.5M

.4M

.3L

.2L High disturbance at AA (#12i)

.8H

.7M

.6M

.4M

.3L

.2L

.1L Comments: NA 14L. Recreation/Education Potential: (affords bonus points if AA provides recreation or education opportunity)

i. Is the AA a known or potential rec./ed. site: (circle)

(if Yes continue with the evaluation; if No then mark X NA and proceed to the overall summary and rating page) ii. Check categories that apply to the AA:

Educational/scientific study; Consumptive rec.;

Non-consumptive rec.;

Other :

iii. Rating:

Known or Potential Recreation or Education Area Known Potential Public ownership or public easement with general public access (no permission required)

.2H

.15H Private ownership with general public access (no permission required)

.15H

.1M Private or public ownership without general public access, or requiring permission for public access

.1M

.05L Comments: Proximity to industrial use limits recreational potential General Site Notes NA 5

FUNCTION & VALUE

SUMMARY

& OVERALL RATING FOR WETLAND/SITE #(S):

wetland 1, wetland 2, wetland 3, wetland 4 Function & Value Variables Rating Actual Functional Points Possible Functional Points Functional Units: (Actual Points x Wetland Acreage)

Indicate the four most prominent functions with an asterisk (*)

A. Listed/Proposed T&E Species Habitat L

0.00 1

0.00 B. MT Natural Heritage Program Species Habitat L

0.00 1

0.00 C. General Wildlife Habitat M

0.50 1

10.05 D. General Fish Habitat NA E. Flood Attenuation M

0.60 1

12.06 F. Short and Long Term Surface Water Storage H

1.00 1

20.10 G. Sediment/Nutrient/Toxicant Removal H

1.00 1

20.10 H. Sediment/Shoreline Stabilization H

1.00 1

20.10 I. Production Export/Food Chain Support H

0.90 1

18.09 J. Groundwater Discharge/Recharge NA K. Uniqueness L

0.20 1

4.02 L. Recreation/Education Potential (bonus points)

NA Totals:

5.20 9.00 104.52 Percent of Possible Score 58%

Category I Wetland: (must satisfy one of the following criteria; otherwise go to Category II)

Score of 1 functional point for Listed/Proposed Threatened or Endangered Species; or Score of 1 functional point for Uniqueness; or Score of 1 functional point for Flood Attenuation and answer to Question 14E.ii is "yes"; or Percent of possible score > 80% (round to nearest whole #).

Category II Wetland: (Criteria for Category I not satisfied and meets any one of the following criteria; otherwise go to Category IV)

Score of 1 functional point for MT Natural Heritage Program Species Habitat; or Score of.9 or 1 functional point for General Wildlife Habitat; or Score of.9 or 1 functional point for General Fish Habitat; or "High" to Exceptional ratings for both General Wildlife Habitat and General Fish/Aquatic Habitat; or Score of.9 functional point for Uniqueness; or Percent of possible score > 65% (round to nearest whole #).

Category III Wetland: (Criteria for Categories I, II, or IV not satisfied)

Category IV Wetland: (Criteria for Categories I or II are not satisfied and all of the following criteria are met; otherwise go to Category III)

X "Low" rating for Uniqueness; and Vegetated wetland component 1 acre (do not include upland vegetated buffer); and Percent of possible score 35% (round to nearest whole #).

OVERALL ANALYSIS AREA RATING:

III Summary Comments: NA 6

MDT Montana Wetland Assessment Form (revised March 2008)

1. Project Name:

Natrium Demonstration Project

2. MDT Project #:

Control #:

AA3

3. Evaluation Date:

08/08/2022

4. Evaluator(s):

JTR

5. Wetlands/Site #(s):

wetlands 7 through 12

6. Wetland Location(s): i. Legal: S12, T20N, R117W; S7, T20N, R116W Latitude/Longitude: (41.7371116, -110.59183546);

(41.73464718,-110.5665206);

(41.73570375, -110.57248775);

(41.73580633, -110.58279876);

(41.73571652, -110.58213246);

(41.7351916, -110.57859541) ii. Approx. Stationing or Mileposts:

iii. Watershed:

Watershed Name, County:

Green River Basin, Lincoln

7. a. Evaluating Agency:

b. Purpose of Evaluation:

1. Wetlands potentially affected by MDT project

8. Wetland size:

15.700 acres (measured)

2. X Mitigation wetlands; pre-construction

3. Mitigation wetlands; post-construction

9. Assessment area (AA):

15.700 acres (measured)

4. Other:

10. Classification of Wetland and Aquatic Habitats in AA Abbreviations: (see manual for definitions)

HGM Class (Brinson)

Class (Cowardin)

Modifier (Cowardin)

Water Regime

% of AA D

EM NA SI 50.00 R

EM NA PP 25.00 R

EM NA SI 25.00 HGM Classes: Riverine (R), Depressional (D), Slope (S), Mineral Soil Flats (MSF), Organic Soil Flats (OSF), Lacustrine Fringe (LF);

Cowardin Classes: Rock Bottom (RB), Unconsolidated bottom (UB),

Aquatic Bed (AB), Unconsolidated Shore (US), Moss-lichen Wetland (ML), Emergent Wetland (EM), Scrub-Shrub Wetland (SS), Forested Wetland (FO)

Modifiers: Excavated (E), Impounded (I), Diked (D), Partly Drained (PD), Farmed (F), Artificial (A)

Water Regimes: Permanent / Perennial (PP), Seasonal / Intermittent (SI), Temporary / Ephemeral (TE)

11. Estimated relative abundance: (of similarly classified sites within the same Major Montana Watershed Basin, see definitions)

COMMON

12. General condition of AA:

i. Disturbance: (use matrix below to determine [circle] appropriate response - see instructions for Montana-listed noxious weed and aquatic nuisance vegetation species (ANVS) list)

Conditions within AA Predominant conditions adjacent to (within 500 feet of) AA Managed in predominantly natural state; is not grazed, hayed, logged, or otherwise converted; does not contain roads or buildings; and noxious weed or ANVS cover is >=15%.

Land not cultivated, but may be moderately grazed or hayed or selectively logged; or has been subject to minor clearing; contains few roads or buildings; noxious weed or ANVS cover is <= 30%.

Land cultivated or heavily grazed or logged; subject to substantial fill placement, grading, clearing, or hydrological alteration; high road or building density; or noxious weed or ANVS cover is > 30%.

AA occurs and is managed in predominantly natural state; is not grazed, hayed, logged, or otherwise converted; does not contain roads or occupied buildings; and noxious weed or ANVS cover is <= 15%.

low disturbance low disturbance moderate disturbance AA not cultivated, but may be moderately grazed or hayed or selectively logged; or has been subject to relatively minor clearing, fill placement, or hydrological alteration; contains few roads or buildings; noxious weed or ANVS cover is <=

moderate disturbance moderate disturbance high disturbance AA cultivated or heavily grazed or logged; subject to relatively substantial fill placement, grading, clearing, or hydrological alteration; high road or building density; or noxious weed or ANVS cover is > 30%.

high disturbance high disturbance high disturbance Comments: (types of disturbance, intensity, season, etc.): Heavy sheep and cattle grazing ii. Prominent noxious, aquatic nuisance, & other exotic vegetation species: None observed iii. Provide brief descriptive summary of AA and surrounding land use/habitat: Surrounding land use is industrial and livestock grazing

13. Structural Diversity: (based on number of "Cowardin" vegetated classes present [do not include unvegetated classes], see #10 above)

Existing # of Cowardin Vegetated Classes in AA Initial Rating Is current management preventing (passive) existence of additional vegetated classes?

Modified Rating

>= 3 (or 2 if 1 is forested) classes H

NA NA NA 2 (or 1 if forested) classes M

NA NA NA 1 class, but not a monoculture M

<-- NO YES -->

L 1 class, monoculture (1 species comprises >= 90% of total cover)

L NA NA NA Comments: Vegetation type is emergent 1

SECTION PERTAINING to FUNCTIONS & VALUES ASSESSMENT 14A. Habitat for Federally Listed or Proposed Threatened or Endangered Plants or Animals:

i. AA is Documented (D) or Suspected (S) to contain (circle one based on definitions contained in instructions):

No usable habitat Primary or critical habitat (list species)

Secondary habitat (list species)

Incidental habitat (list species) ii. Rating (use the conclusions from i above and the matrix below to arrive at [circle] the functional points and rating)

Highest Habitat Level doc/primary sus/primary doc/secondary sus/secondary doc/incidental sus/incidental None Functional Points and Rating 1H

.9H

.8M

.7M

.3L

.1L 0L Sources for documented use (e.g. observations, records, etc): NA 14B. Habitat for plant or animals rated S1, S2, or S3 by the Montana Natural Heritage Program: (not including species listed in14A above)

i. AA is Documented (D) or Suspected (S) to contain (circle one based on definitions contained in instructions):

No usable habitat Primary or critical habitat (list species)

Secondary habitat (list species)

Incidental habitat (list species) ii. Rating (use the conclusions from i above and the matrix below to arrive at [circle] the functional points and rating)

Highest Habitat Level doc/primary sus/primary doc/secondary sus/secondary doc/incidental sus/incidental None S1 Species: Functional Points and Rating 1H

.8H

.7M

.6M

.2L

.1L 0L S2 and S3 Species: Functional Points and Rating

.9H

.7M

.6M

.5M

.2L

.1L 0L Sources for documented use (e.g. observations, records, etc): NA 14C. General Wildlife Habitat Rating:

i. Evidence of overall wildlife use in the AA (circle substantial, moderate, or low based on supporting evidence):

Substantial (based on any of the following [check]):

Minimal (based on any of the following [check]):

observations of abundant wildlife #s or high species diversity (during any period) few or no wildlife observations during peak use periods abundant wildlife sign such as scat, tracks, nest structures, game trails, etc.

little to no wildlife sign presence of extremely limiting habitat features not available in the surrounding area sparse adjacent upland food sources interviews with local biologists with knowledge of the AA interviews with local biologists with knowledge of the AA Moderate (based on any of the following [check]):

X observations of scattered wildlife groups or individuals or relatively few species during peak periods common occurrence of wildlife sign such as scat, tracks, nest structures, game trails, etc.

adequate adjacent upland food sources interviews with local biologists with knowledge of the AA ii. Wildlife habitat features (Working from top to bottom, circle appropriate AA attributes in matrix to arrive at rating. Structural diversity is from #13. For class cover to be considered evenly distributed, the most and least prevalent vegetated classes must be within 20% of each other interms of their percent composition of the AA (see #10). Abbreviations for surface water durations are as follows: P/P = permanent/perennial; S/I = seasonal/intermittent; T/E =

temporary/ephemeral; and A = absent [see instructions for further definitions of these terms])

Structural diversity (see #13)

High Moderate Low Class cover distribution (all vegetated classes)

Even Uneven Even Uneven Even Duration of surface water in

>=10% of AA P/P S/I T/E A

P/P S/I T/E A

Low disturbance at AA (see

12i)

E E

E H

E E

H H

E H

H M

E H

M M

E H

M M

Moderate disturbance at AA (see #12i)

H H

H M

H H

M M

H M

M L

H M

L L

High disturbance at AA (see

12i)

M M

M L

M M

L L

M M

L L

M L

L L

iii. Rating (use the conclusions from i and ii above and the matrix below to arrive at [circle] the functional points and rating)

Evidence of wildlife use (i)

Wildlife habitat features rating (ii)

Exceptional High Moderate Moderate Substantial 1E

.9H

.8H

.7M Moderate

.9H

.7M

.5M

.3L Minimal

.6M

.4M

.2L

.1L Comments:

Pronghorn observed. Bobcat observed nearby. See TVES report for list of wildlife observed.

14D. General Fish Habitat Rating: (Assess this function if the AA is used by fish or the existing situation is correctable such that the AA could be used by fish [i.e., fish use is precluded by perched culvert or other barrier, etc.]. If the AA is not used by fish, fish use is not restorable due to habitat constraints, or is not desired from a management perspective [such as fish entrapped in a canal], then mark X NA and proceed to 14E.)

Type of Fishery:

Cold Water (CW)

Warm Water (WW)

Use the CW or WW guidelines in the user manual to complete the matrix

i. Habitat Quality and Known / Suspected Fish Species in AA (use matrix to arrive at [circle] the functional points and rating)

Duration of surface water in AA Permanent / Perennial Seasonal / Intermittent Temporary / Ephemeral Aquatic hiding / resting /

escape cover Optimal Adequate Poor Optimal Adequate Poor Optimal Adequate Poor Thermal cover optimal /

suboptimal O

S O

S FWP Tier I fish species 1E

.9H

.8H

.7M

.6M

.5M

.9H

.8H

.7M

.6M

.5M

.4M

.7M

.6M

.5M

.4M

.3L

.2L FWP Tier II or Native Game fish species

.9H

.8H

.7M

.6M

.5M

.8H

.7M

.6M

.5M

.4M

.6M

.5M

.4M

.3L

.2L

.2L FWP Tier III or Introduced Game fish

.8H

.7M

.6M

.5M

.4M

.7M

.6M

.5M

.4M

.3L

.5M

.4M

.3L

.2L

.1L FWP Non-Game Tier IV or No fish species

.5M

.4M

.3L

.4M

.3L

.2L

.1L

.1L Sources used for identifying fish sp. potentially found in AA:

ii. Modified Rating (NOTE: Modified score cannot exceed 1 or be less than 0.1) a) Is fish use of the AA significantly reduced by a culvert, dike, or other man-made structure or activity or is the waterbody included on the current final MDEQ list of waterbodies in need of TMDL development with listed Probable Impaired Uses including cold or warm water fishery or aquatic life support, or do aquatic nuisance plant or animal species (see Appendix E) occur in fish habitat?

If yes, reduce score in i above by 0.1.

b) Does the AA contain a documented spawning area or other critical habitat feature (i.e., sanctuary pool, upwelling area, etc.- specify in comments) for native fish or introduced game fish? If yes, add 0.1 to the adjusted score in i or iia.

iii. Final Score and Rating:

NA Comments:

NA 14E. Flood Attenuation: (Applies only to wetlands subject to flooding via in-channel or overbank flow. If wetlands in AA are not flooded from in-channel or overbank flow, mark NA and proceed to 14F.)

i. Rating (working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating)

Estimated or Calculated Entrenchment (Rosgen 1994, 1996)

Slightly entrenched - C, D, E stream types Moderately entrenched - B stream type Entrenched-A, F, G stream types

% of flooded wetland classified as forested and/or scrub/shrub 75%

25-75%

<25%

75%

25-75%

<25%

75%

25-75%

<25%

AA contains no outlet or restricted outlet 1H

.9H

.6M

.8H

.7M

.5M

.4M

.3L

.2L AA contains unrestricted outlet

.9H

.8H

.5M

.7M

.6M

.4M

.3L

.2L

.1L Entrenchment ratio (ER) estimation - see Users Manual for additional guidance. Entrenchment ratio = (flood-prone width)/(bankfull width) Flood-prone width = estimated horizontal projection of where 2 x maximum bankfull depth elevation intersects the floodplain on each side of the stream.

12 /

4 =

3.00 Flood-prone width Bankfull width Entrenchment ratio (ER)

Slightly Entrenched ER = >2.2 Moderately Entrenched ER = 1.41 - 2.2 Entrenched ER = 1.0 - 1.4 C stream type D stream type E stream type B stream type A stream type F stream type G stream type ii. Are 10 acres of wetland in the AA subject to flooding AND are man-made features which may be significantly damaged by floods located within 0.5 mile downstream of the AA (circle)?

Comments:

Flooding likely occurs in these broad alkaline flat wetlands 3

14F. Short and Long Term Surface Water Storage: (Applies to wetlands that flood or pond from overbank or in-channel flow, precipitation, upland surface flow, or groundwater flow. If no wetlands in the AA are subject to flooding or ponding, mark NA and proceed to 14G.)

i. Rating (Working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating. Abbreviations for surface water durations are as follows: P/P = permanent/perennial; S/I = seasonal/intermittent; and T/E = temporary/ephemeral [see instructions for further definitions of these terms].)

Estimated maximum acre feet of water contained in wetlands within the AA that are subject to periodic flooding or ponding

>5 acre feet 1.1 to 5 acre feet

<=1 acre foot Duration of surface water at wetlands within the AA P/P S/I T/E P/P S/I T/E P/P S/I T/E Wetlands in AA flood or pond >= 5 out of 10 years 1H

.9H

.8H

.6M

.5M

.4M

.3L

.2L Wetlands in AA flood or pond < 5 out of 10 years

.9H

.8H

.7M

.5M

.4M

.3L

.2L

.1L Comments: Wetlands are likely flooded during storms and runoff 14G. Sediment/Nutrient/Toxicant Retention and Removal: (Applies to wetlands with potential to receive sediments, nutrients, or toxicants through influx of surface or ground water or direct input. If no wetlands in the AA are subject to such input, mark NA and proceed to 14H.)

i. Rating Sediment, nutrient, and toxicant input levels within AA AA receives or surrounding land use with potential to deliver levels of sediments, nutrients, or compounds at levels such that other functions are not substantially impaired. Minor sedimentation, sources of nutrients or toxicants, or signs of eutrophication present.

Waterbody on MDEQ list of waterbodies in need of TMDL development for probable causes related to sediment, nutrients, or toxicants or AA receives or surrounding land use with potential to deliver high levels of sediments, nutrients, or compounds such that other functions are substantially impaired. Major sedimentation, sources of nutrients or toxicants, or signs of eutrophication present.

% cover of wetland vegetation in AA

>= 70%

< 70%

>= 70%

< 70%

Evidence of flooding / ponding in AA Yes No Yes No Yes No Yes No AA contains no or restricted outlet 1H

.8H

.7M

.5M

.4M

.3L

.2L AA contains unrestricted outlet

.9H

.7M

.6M

.4M

.3L

.2L

.1L Comments: NA 14H Sediment/Shoreline Stabilization: (Applies only if AA occurs on or within the banks or a river, stream, or other natural or man-made drainage, or on the shoreline of a standing water body which is subject to wave action. If 14H does not apply, mark NA and proceed to 14I.)

i. Rating (working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating)

% Cover of wetland streambank or shoreline by species with stability ratings of >=6 (see Appendix F).

Duration of surface water adjacent to rooted vegetation Permanent / Perennial Seasonal / Intermittent Temporary / Ephemeral

>= 65%

1H

.9H

.7M 35-64%

.7M

.6M

.5M 35%

.3L

.2L

.1L Comments: Perennial and intermittent streams in the AA are heavily vegetated 14I. Production Export/Food Chain Support:

i. Level of Biological Activity (synthesis of wildlife and fish habitat ratings [circle])

General Fish Habitat Rating (14D.iii.)

General Wildlife Habitat Rating (14C.iii.)

E/H M

L E/H H

H M

M H

M M

L M

M L

N/A H

M L

ii. Rating (Working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating. Factor A = acreage of vegetated wetland component in the AA; Factor B = level of biological activity rating from above (14I.i.); Factor C = whether or not the AA contains a surface or subsurface outlet; the final three rows pertain to duration of surface water in the AA, where P/P, S/I, and T/E are as previously defined, and A = absent [see instructions for further definitions of these terms].)

A Vegetated component >5 acres Vegetated component 1-5 acres Vegetated component < 1 acre B

High Moderate Low High Moderate Low High Moderate Low C

Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No P/P 1H

.7M

.8H

.5M

.6M

.4M

.9H

.6M

.7M

.4M

.5M

.3L

.8H

.6M

.4M

.3L

.2L S/I

.9H

.6M

.7M

.4M

.5M

.3L

.8H

.5M

.6M

.3L

.4M

.2L

.7M

.5M

.3L

.2L T/E/A

.8H

.5M

.6M

.3L

.4M

.2L

.7M

.4M

.5M

.2L

.3L

.1L

.6M

.4M

.2L

.1L iii. Modified Rating (NOTE: Modified score cannot exceed 1 or be less than 0.1.) Vegetated Upland Buffer (VUB): Area with >= 30% plant cover, = 15%

noxious weed or ANVS cover, and that is not subjected to periodic mechanical mowing or clearing (unless for weed control).

a) Is there an average >= 50 foot-wide vegetated upland buffer around >= 75% of the AA circumference? X If yes, add 0.1 to the score in ii above.

iv. Final Score and Rating:

0.90H Comments: NA 4

14J. Groundwater Discharge/Recharge: (check the appropriate indicators in i & ii below)

i. Discharge Indicators ii. Recharge Indicators The AA is a slope wetland Permeable substrate present without underlying impeding layer Springs or seeps are known or observed Wetland contains inlet but no outlet Vegetation growing during dormant season/drought Stream is a known losing stream; discharge volume decreases Wetland occurs at the toe of a natural slope Other:

AA permanently flooded during drought periods Wetland contains an outlet, but no inlet Shallow water table and the site is saturated to the surface Other:

iii. Rating (use the information from i and ii above and the table below to arrive at [circle] the functional points and rating)

Criteria Duration of saturation at AA Wetlands FROM GROUNDWATER DISCHARGE OR WITH WATER THAT IS RECHARGING THE GROUNDWATER SYSTEM P/P S/I T

None Groundwater Discharge or Recharge 1H

.7M

.4M

.1L Insufficient Data/Information N/A Comments: NA 14K. Uniqueness:

i. Rating (working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating)

Replacement potential AA contains fen, bog, warm springs or mature (>80 yr-old) forested wetland or plant association listed as S1 by the MTNHP AA does not contain previously cited rare types and structural diversity

(#13) is high or contains plant association listed as S2 by the MTNHP AA does not contain previously cited rare types or associations and structural diversity (#13) is low-moderate Estimated relative abundance (#11) rare common abundant rare common abundant rare common abundant Low disturbance at AA (#12i) 1H

.9H

.8H

.6M

.5M

.4M

.3L Moderate disturbance at AA (#12i)

.9H

.8H

.7M

.5M

.4M

.3L

.2L High disturbance at AA (#12i)

.8H

.7M

.6M

.4M

.3L

.2L

.1L Comments: NA 14L. Recreation/Education Potential: (affords bonus points if AA provides recreation or education opportunity)

i. Is the AA a known or potential rec./ed. site: (circle)

(if Yes continue with the evaluation; if No then mark X NA and proceed to the overall summary and rating page) ii. Check categories that apply to the AA:

Educational/scientific study; Consumptive rec.;

Non-consumptive rec.;

Other :

iii. Rating:

Known or Potential Recreation or Education Area Known Potential Public ownership or public easement with general public access (no permission required)

.2H

.15H Private ownership with general public access (no permission required)

.15H

.1M Private or public ownership without general public access, or requiring permission for public access

.1M

.05L Comments: NA General Site Notes NA 5

FUNCTION & VALUE

SUMMARY

& OVERALL RATING FOR WETLAND/SITE #(S):

wetlands 7 through 12 Function & Value Variables Rating Actual Functional Points Possible Functional Points Functional Units: (Actual Points x Wetland Acreage)

Indicate the four most prominent functions with an asterisk (*)

A. Listed/Proposed T&E Species Habitat L

0.00 1

0.00 B. MT Natural Heritage Program Species Habitat L

0.00 1

0.00 C. General Wildlife Habitat M

0.50 1

7.85 D. General Fish Habitat NA E. Flood Attenuation M

0.50 1

7.85 F. Short and Long Term Surface Water Storage H

1.00 1

15.70 G. Sediment/Nutrient/Toxicant Removal M

0.60 1

9.42 H. Sediment/Shoreline Stabilization H

1.00 1

15.70 I. Production Export/Food Chain Support H

0.90 1

14.13 J. Groundwater Discharge/Recharge NA K. Uniqueness L

0.20 1

3.14 L. Recreation/Education Potential (bonus points)

NA Totals:

4.70 9.00 73.79 Percent of Possible Score 52%

Category I Wetland: (must satisfy one of the following criteria; otherwise go to Category II)

Score of 1 functional point for Listed/Proposed Threatened or Endangered Species; or Score of 1 functional point for Uniqueness; or Score of 1 functional point for Flood Attenuation and answer to Question 14E.ii is "yes"; or Percent of possible score > 80% (round to nearest whole #).

Category II Wetland: (Criteria for Category I not satisfied and meets any one of the following criteria; otherwise go to Category IV)

Score of 1 functional point for MT Natural Heritage Program Species Habitat; or Score of.9 or 1 functional point for General Wildlife Habitat; or Score of.9 or 1 functional point for General Fish Habitat; or "High" to Exceptional ratings for both General Wildlife Habitat and General Fish/Aquatic Habitat; or Score of.9 functional point for Uniqueness; or Percent of possible score > 65% (round to nearest whole #).

Category III Wetland: (Criteria for Categories I, II, or IV not satisfied)

Category IV Wetland: (Criteria for Categories I or II are not satisfied and all of the following criteria are met; otherwise go to Category III)

X "Low" rating for Uniqueness; and Vegetated wetland component 1 acre (do not include upland vegetated buffer); and Percent of possible score 35% (round to nearest whole #).

OVERALL ANALYSIS AREA RATING:

III Summary Comments: NA 6

MDT Montana Wetland Assessment Form (revised March 2008)

1. Project Name:

Natrium Demonstration Project

2. MDT Project #:

Control #:

AA4

3. Evaluation Date:

08/08/2022

4. Evaluator(s):

JTR

5. Wetlands/Site #(s):

Wetlands 13, 14, 15

6. Wetland Location(s): i. Legal: S20, T20N, R116W; S7, T20N, R116W; S17, T20N, R116W Latitude/Longitude: (41.70102049, -110.55569408);

(41.73493587, -110.56240119);

(41.71106745, -110.55611891) ii. Approx. Stationing or Mileposts:

iii. Watershed:

Watershed Name, County:

Green River Basin, Lincoln

7. a. Evaluating Agency:

b. Purpose of Evaluation:

1. Wetlands potentially affected by MDT project

8. Wetland size:

18.000 acres (measured)

2. X Mitigation wetlands; pre-construction

3. Mitigation wetlands; post-construction

9. Assessment area (AA):

18.000 acres (measured)

4. Other:

10. Classification of Wetland and Aquatic Habitats in AA Abbreviations: (see manual for definitions)

HGM Class (Brinson)

Class (Cowardin)

Modifier (Cowardin)

Water Regime

% of AA D

EM NA SI 25.00 R

UB NA SI 25.00 R

UB NA PP 50.00 HGM Classes: Riverine (R), Depressional (D), Slope (S), Mineral Soil Flats (MSF), Organic Soil Flats (OSF), Lacustrine Fringe (LF);

Cowardin Classes: Rock Bottom (RB), Unconsolidated bottom (UB),

Aquatic Bed (AB), Unconsolidated Shore (US), Moss-lichen Wetland (ML), Emergent Wetland (EM), Scrub-Shrub Wetland (SS), Forested Wetland (FO)

Modifiers: Excavated (E), Impounded (I), Diked (D), Partly Drained (PD), Farmed (F), Artificial (A)

Water Regimes: Permanent / Perennial (PP), Seasonal / Intermittent (SI), Temporary / Ephemeral (TE)

11. Estimated relative abundance: (of similarly classified sites within the same Major Montana Watershed Basin, see definitions)

COMMON

12. General condition of AA:

i. Disturbance: (use matrix below to determine [circle] appropriate response - see instructions for Montana-listed noxious weed and aquatic nuisance vegetation species (ANVS) list)

Conditions within AA Predominant conditions adjacent to (within 500 feet of) AA Managed in predominantly natural state; is not grazed, hayed, logged, or otherwise converted; does not contain roads or buildings; and noxious weed or ANVS cover is >=15%.

Land not cultivated, but may be moderately grazed or hayed or selectively logged; or has been subject to minor clearing; contains few roads or buildings; noxious weed or ANVS cover is <= 30%.

Land cultivated or heavily grazed or logged; subject to substantial fill placement, grading, clearing, or hydrological alteration; high road or building density; or noxious weed or ANVS cover is > 30%.

AA occurs and is managed in predominantly natural state; is not grazed, hayed, logged, or otherwise converted; does not contain roads or occupied buildings; and noxious weed or ANVS cover is <= 15%.

low disturbance low disturbance moderate disturbance AA not cultivated, but may be moderately grazed or hayed or selectively logged; or has been subject to relatively minor clearing, fill placement, or hydrological alteration; contains few roads or buildings; noxious weed or ANVS cover is <=

moderate disturbance moderate disturbance high disturbance AA cultivated or heavily grazed or logged; subject to relatively substantial fill placement, grading, clearing, or hydrological alteration; high road or building density; or noxious weed or ANVS cover is > 30%.

high disturbance high disturbance high disturbance Comments: (types of disturbance, intensity, season, etc.): Grazing use ii. Prominent noxious, aquatic nuisance, & other exotic vegetation species: None observed iii. Provide brief descriptive summary of AA and surrounding land use/habitat: Livestock grazing

13. Structural Diversity: (based on number of "Cowardin" vegetated classes present [do not include unvegetated classes], see #10 above)

Existing # of Cowardin Vegetated Classes in AA Initial Rating Is current management preventing (passive) existence of additional vegetated classes?

Modified Rating

>= 3 (or 2 if 1 is forested) classes H

NA NA NA 2 (or 1 if forested) classes M

NA NA NA 1 class, but not a monoculture M

<-- NO YES -->

L 1 class, monoculture (1 species comprises >= 90% of total cover)

L NA NA NA Comments: Emergent veg 1

SECTION PERTAINING to FUNCTIONS & VALUES ASSESSMENT 14A. Habitat for Federally Listed or Proposed Threatened or Endangered Plants or Animals:

i. AA is Documented (D) or Suspected (S) to contain (circle one based on definitions contained in instructions):

Primary or critical habitat (list species)

Secondary habitat (list species)

Incidental habitat (list species) common yellowthroat(D) ii. Rating (use the conclusions from i above and the matrix below to arrive at [circle] the functional points and rating)

Highest Habitat Level doc/primary sus/primary doc/secondary sus/secondary doc/incidental sus/incidental None Functional Points and Rating 1H

.9H

.8M

.7M

.3L

.1L 0L Sources for documented use (e.g. observations, records, etc): NA 14B. Habitat for plant or animals rated S1, S2, or S3 by the Montana Natural Heritage Program: (not including species listed in14A above)

i. AA is Documented (D) or Suspected (S) to contain (circle one based on definitions contained in instructions):

No usable habitat Primary or critical habitat (list species)

Secondary habitat (list species)

Incidental habitat (list species) ii. Rating (use the conclusions from i above and the matrix below to arrive at [circle] the functional points and rating)

Highest Habitat Level doc/primary sus/primary doc/secondary sus/secondary doc/incidental sus/incidental None S1 Species: Functional Points and Rating 1H

.8H

.7M

.6M

.2L

.1L 0L S2 and S3 Species: Functional Points and Rating

.9H

.7M

.6M

.5M

.2L

.1L 0L Sources for documented use (e.g. observations, records, etc): NA 14C. General Wildlife Habitat Rating:

i. Evidence of overall wildlife use in the AA (circle substantial, moderate, or low based on supporting evidence):

Substantial (based on any of the following [check]):

Minimal (based on any of the following [check]):

observations of abundant wildlife #s or high species diversity (during any period) few or no wildlife observations during peak use periods abundant wildlife sign such as scat, tracks, nest structures, game trails, etc.

little to no wildlife sign presence of extremely limiting habitat features not available in the surrounding area sparse adjacent upland food sources interviews with local biologists with knowledge of the AA interviews with local biologists with knowledge of the AA Moderate (based on any of the following [check]):

X observations of scattered wildlife groups or individuals or relatively few species during peak periods common occurrence of wildlife sign such as scat, tracks, nest structures, game trails, etc.

adequate adjacent upland food sources interviews with local biologists with knowledge of the AA ii. Wildlife habitat features (Working from top to bottom, circle appropriate AA attributes in matrix to arrive at rating. Structural diversity is from #13. For class cover to be considered evenly distributed, the most and least prevalent vegetated classes must be within 20% of each other interms of their percent composition of the AA (see #10). Abbreviations for surface water durations are as follows: P/P = permanent/perennial; S/I = seasonal/intermittent; T/E =

temporary/ephemeral; and A = absent [see instructions for further definitions of these terms])

Structural diversity (see #13)

High Moderate Low Class cover distribution (all vegetated classes)

Even Uneven Even Uneven Even Duration of surface water in

>=10% of AA P/P S/I T/E A

P/P S/I T/E A

Low disturbance at AA (see

12i)

E E

E H

E E

H H

E H

H M

E H

M M

E H

M M

Moderate disturbance at AA (see #12i)

H H

H M

H H

M M

H M

M L

H M

L L

High disturbance at AA (see

12i)

M M

M L

M M

L L

M M

L L

M L

L L

iii. Rating (use the conclusions from i and ii above and the matrix below to arrive at [circle] the functional points and rating)

Evidence of wildlife use (i)

Wildlife habitat features rating (ii)

Exceptional High Moderate Moderate Substantial 1E

.9H

.8H

.7M Moderate

.9H

.7M

.5M

.3L Minimal

.6M

.4M

.2L

.1L Comments:

See TVES report for list of wildlife observations 2

14D. General Fish Habitat Rating: (Assess this function if the AA is used by fish or the existing situation is correctable such that the AA could be used by fish [i.e., fish use is precluded by perched culvert or other barrier, etc.]. If the AA is not used by fish, fish use is not restorable due to habitat constraints, or is not desired from a management perspective [such as fish entrapped in a canal], then mark NA and proceed to 14E.)

Type of Fishery:

Cold Water (CW) X Warm Water (WW)

Use the CW or WW guidelines in the user manual to complete the matrix

i. Habitat Quality and Known / Suspected Fish Species in AA (use matrix to arrive at [circle] the functional points and rating)

Duration of surface water in AA Permanent / Perennial Seasonal / Intermittent Temporary / Ephemeral Aquatic hiding / resting /

escape cover Optimal Adequate Poor Optimal Adequate Poor Optimal Adequate Poor Thermal cover optimal /

suboptimal O

S O

S FWP Tier I fish species 1E

.9H

.8H

.7M

.6M

.5M

.9H

.8H

.7M

.6M

.5M

.4M

.7M

.6M

.5M

.4M

.3L

.2L FWP Tier II or Native Game fish species

.9H

.8H

.7M

.6M

.5M

.8H

.7M

.6M

.5M

.4M

.6M

.5M

.4M

.3L

.2L

.2L FWP Tier III or Introduced Game fish

.8H

.7M

.6M

.5M

.4M

.7M

.6M

.5M

.4M

.3L

.5M

.4M

.3L

.2L

.1L FWP Non-Game Tier IV or No fish species

.5M

.4M

.3L

.4M

.3L

.2L

.1L

.1L Sources used for identifying fish sp. potentially found in AA: Wyoming Fish and Game Report on Green River Basin aquatic wildlife indicates trout species are present in Muddy Creek. Little Muddy Creek< which in in AA4, is a tributary of that stream chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://wgfd.wyo.gov/WGFD/media/c ontent/PDF/Habitat/SWAP/Aquatic%20Basins/Green-River-Basin.pdf ii. Modified Rating (NOTE: Modified score cannot exceed 1 or be less than 0.1) a) Is fish use of the AA significantly reduced by a culvert, dike, or other man-made structure or activity or is the waterbody included on the current final MDEQ list of waterbodies in need of TMDL development with listed Probable Impaired Uses including cold or warm water fishery or aquatic life support, or do aquatic nuisance plant or animal species (see Appendix E) occur in fish habitat?

If yes, reduce score in i above by 0.1.

b) Does the AA contain a documented spawning area or other critical habitat feature (i.e., sanctuary pool, upwelling area, etc.- specify in comments) for native fish or introduced game fish? If yes, add 0.1 to the adjusted score in i or iia.

iii. Final Score and Rating:

0.6M Comments:

NA 14E. Flood Attenuation: (Applies only to wetlands subject to flooding via in-channel or overbank flow. If wetlands in AA are not flooded from in-channel or overbank flow, mark NA and proceed to 14F.)

i. Rating (working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating)

Estimated or Calculated Entrenchment (Rosgen 1994, 1996)

Slightly entrenched - C, D, E stream types Moderately entrenched - B stream type Entrenched-A, F, G stream types

% of flooded wetland classified as forested and/or scrub/shrub 75%

25-75%

<25%

75%

25-75%

<25%

75%

25-75%

<25%

AA contains no outlet or restricted outlet 1H

.9H

.6M

.8H

.7M

.5M

.4M

.3L

.2L AA contains unrestricted outlet

.9H

.8H

.5M

.7M

.6M

.4M

.3L

.2L

.1L Entrenchment ratio (ER) estimation - see Users Manual for additional guidance. Entrenchment ratio = (flood-prone width)/(bankfull width) Flood-prone width = estimated horizontal projection of where 2 x maximum bankfull depth elevation intersects the floodplain on each side of the stream.

25 /

15 =

1.67 Flood-prone width Bankfull width Entrenchment ratio (ER)

Slightly Entrenched ER = >2.2 Moderately Entrenched ER = 1.41 - 2.2 Entrenched ER = 1.0 - 1.4 C stream type D stream type E stream type B stream type A stream type F stream type G stream type ii. Are 10 acres of wetland in the AA subject to flooding AND are man-made features which may be significantly damaged by floods located within 0.5 mile downstream of the AA (circle)?

Comments:

NA 3

14F. Short and Long Term Surface Water Storage: (Applies to wetlands that flood or pond from overbank or in-channel flow, precipitation, upland surface flow, or groundwater flow. If no wetlands in the AA are subject to flooding or ponding, mark NA and proceed to 14G.)

i. Rating (Working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating. Abbreviations for surface water durations are as follows: P/P = permanent/perennial; S/I = seasonal/intermittent; and T/E = temporary/ephemeral [see instructions for further definitions of these terms].)

Estimated maximum acre feet of water contained in wetlands within the AA that are subject to periodic flooding or ponding

>5 acre feet 1.1 to 5 acre feet

<=1 acre foot Duration of surface water at wetlands within the AA P/P S/I T/E P/P S/I T/E P/P S/I T/E Wetlands in AA flood or pond >= 5 out of 10 years 1H

.9H

.8H

.6M

.5M

.4M

.3L

.2L Wetlands in AA flood or pond < 5 out of 10 years

.9H

.8H

.7M

.5M

.4M

.3L

.2L

.1L Comments: NA 14G. Sediment/Nutrient/Toxicant Retention and Removal: (Applies to wetlands with potential to receive sediments, nutrients, or toxicants through influx of surface or ground water or direct input. If no wetlands in the AA are subject to such input, mark NA and proceed to 14H.)

i. Rating Sediment, nutrient, and toxicant input levels within AA AA receives or surrounding land use with potential to deliver levels of sediments, nutrients, or compounds at levels such that other functions are not substantially impaired. Minor sedimentation, sources of nutrients or toxicants, or signs of eutrophication present.

Waterbody on MDEQ list of waterbodies in need of TMDL development for probable causes related to sediment, nutrients, or toxicants or AA receives or surrounding land use with potential to deliver high levels of sediments, nutrients, or compounds such that other functions are substantially impaired. Major sedimentation, sources of nutrients or toxicants, or signs of eutrophication present.

% cover of wetland vegetation in AA

>= 70%

< 70%

>= 70%

< 70%

Evidence of flooding / ponding in AA Yes No Yes No Yes No Yes No AA contains no or restricted outlet 1H

.8H

.7M

.5M

.4M

.3L

.2L AA contains unrestricted outlet

.9H

.7M

.6M

.4M

.3L

.2L

.1L Comments: NA 14H Sediment/Shoreline Stabilization: (Applies only if AA occurs on or within the banks or a river, stream, or other natural or man-made drainage, or on the shoreline of a standing water body which is subject to wave action. If 14H does not apply, mark NA and proceed to 14I.)

i. Rating (working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating)

% Cover of wetland streambank or shoreline by species with stability ratings of >=6 (see Appendix F).

Duration of surface water adjacent to rooted vegetation Permanent / Perennial Seasonal / Intermittent Temporary / Ephemeral

>= 65%

1H

.9H

.7M 35-64%

.7M

.6M

.5M 35%

.3L

.2L

.1L Comments: NA 14I. Production Export/Food Chain Support:

i. Level of Biological Activity (synthesis of wildlife and fish habitat ratings [circle])

General Fish Habitat Rating (14D.iii.)

General Wildlife Habitat Rating (14C.iii.)

E/H M

L E/H H

H M

M H

M M

L M

M L

N/A H

M L

ii. Rating (Working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating. Factor A = acreage of vegetated wetland component in the AA; Factor B = level of biological activity rating from above (14I.i.); Factor C = whether or not the AA contains a surface or subsurface outlet; the final three rows pertain to duration of surface water in the AA, where P/P, S/I, and T/E are as previously defined, and A = absent [see instructions for further definitions of these terms].)

A Vegetated component >5 acres Vegetated component 1-5 acres Vegetated component < 1 acre B

High Moderate Low High Moderate Low High Moderate Low C

Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No P/P 1H

.7M

.8H

.5M

.6M

.4M

.9H

.6M

.7M

.4M

.5M

.3L

.8H

.6M

.4M

.3L

.2L S/I

.9H

.6M

.7M

.4M

.5M

.3L

.8H

.5M

.6M

.3L

.4M

.2L

.7M

.5M

.3L

.2L T/E/A

.8H

.5M

.6M

.3L

.4M

.2L

.7M

.4M

.5M

.2L

.3L

.1L

.6M

.4M

.2L

.1L iii. Modified Rating (NOTE: Modified score cannot exceed 1 or be less than 0.1.) Vegetated Upland Buffer (VUB): Area with >= 30% plant cover, = 15%

noxious weed or ANVS cover, and that is not subjected to periodic mechanical mowing or clearing (unless for weed control).

a) Is there an average >= 50 foot-wide vegetated upland buffer around >= 75% of the AA circumference? X If yes, add 0.1 to the score in ii above.

iv. Final Score and Rating:

0.90H Comments: NA 4

14J. Groundwater Discharge/Recharge: (check the appropriate indicators in i & ii below)

i. Discharge Indicators ii. Recharge Indicators The AA is a slope wetland Permeable substrate present without underlying impeding layer Springs or seeps are known or observed Wetland contains inlet but no outlet Vegetation growing during dormant season/drought Stream is a known losing stream; discharge volume decreases Wetland occurs at the toe of a natural slope Other:

AA permanently flooded during drought periods Wetland contains an outlet, but no inlet Shallow water table and the site is saturated to the surface Other:

iii. Rating (use the information from i and ii above and the table below to arrive at [circle] the functional points and rating)

Criteria Duration of saturation at AA Wetlands FROM GROUNDWATER DISCHARGE OR WITH WATER THAT IS RECHARGING THE GROUNDWATER SYSTEM P/P S/I T

None Groundwater Discharge or Recharge 1H

.7M

.4M

.1L Insufficient Data/Information N/A Comments: NA 14K. Uniqueness:

i. Rating (working from top to bottom, use the matrix below to arrive at [circle] the functional points and rating)

Replacement potential AA contains fen, bog, warm springs or mature (>80 yr-old) forested wetland or plant association listed as S1 by the MTNHP AA does not contain previously cited rare types and structural diversity

(#13) is high or contains plant association listed as S2 by the MTNHP AA does not contain previously cited rare types or associations and structural diversity (#13) is low-moderate Estimated relative abundance (#11) rare common abundant rare common abundant rare common abundant Low disturbance at AA (#12i) 1H

.9H

.8H

.6M

.5M

.4M

.3L Moderate disturbance at AA (#12i)

.9H

.8H

.7M

.5M

.4M

.3L

.2L High disturbance at AA (#12i)

.8H

.7M

.6M

.4M

.3L

.2L

.1L Comments: NA 14L. Recreation/Education Potential: (affords bonus points if AA provides recreation or education opportunity)

i. Is the AA a known or potential rec./ed. site: (circle)

(if Yes continue with the evaluation; if No then mark X NA and proceed to the overall summary and rating page) ii. Check categories that apply to the AA:

Educational/scientific study; Consumptive rec.;

Non-consumptive rec.;

Other :

iii. Rating:

Known or Potential Recreation or Education Area Known Potential Public ownership or public easement with general public access (no permission required)

.2H

.15H Private ownership with general public access (no permission required)

.15H

.1M Private or public ownership without general public access, or requiring permission for public access

.1M

.05L Comments: NA General Site Notes NA 5

FUNCTION & VALUE

SUMMARY

& OVERALL RATING FOR WETLAND/SITE #(S):

Wetlands 13, 14, 15 Function & Value Variables Rating Actual Functional Points Possible Functional Points Functional Units: (Actual Points x Wetland Acreage)

Indicate the four most prominent functions with an asterisk (*)

A. Listed/Proposed T&E Species Habitat M

0.80 1

14.40 B. MT Natural Heritage Program Species Habitat L

0.00 1

0.00 C. General Wildlife Habitat M

0.50 1

9.00 D. General Fish Habitat M

0.60 1

10.80 E. Flood Attenuation M

0.40 1

7.20 F. Short and Long Term Surface Water Storage H

1.00 1

18.00 G. Sediment/Nutrient/Toxicant Removal H

0.90 1

16.20 H. Sediment/Shoreline Stabilization H

1.00 1

18.00 I. Production Export/Food Chain Support H

0.90 1

16.20 J. Groundwater Discharge/Recharge NA K. Uniqueness L

0.20 1

3.60 L. Recreation/Education Potential (bonus points)

NA Totals:

6.30 10.00 113.40 Percent of Possible Score 63%

Category I Wetland: (must satisfy one of the following criteria; otherwise go to Category II)

Score of 1 functional point for Listed/Proposed Threatened or Endangered Species; or Score of 1 functional point for Uniqueness; or Score of 1 functional point for Flood Attenuation and answer to Question 14E.ii is "yes"; or Percent of possible score > 80% (round to nearest whole #).

Category II Wetland: (Criteria for Category I not satisfied and meets any one of the following criteria; otherwise go to Category IV)

Score of 1 functional point for MT Natural Heritage Program Species Habitat; or Score of.9 or 1 functional point for General Wildlife Habitat; or Score of.9 or 1 functional point for General Fish Habitat; or "High" to Exceptional ratings for both General Wildlife Habitat and General Fish/Aquatic Habitat; or Score of.9 functional point for Uniqueness; or Percent of possible score > 65% (round to nearest whole #).

Category III Wetland: (Criteria for Categories I, II, or IV not satisfied)

Category IV Wetland: (Criteria for Categories I or II are not satisfied and all of the following criteria are met; otherwise go to Category III)

X "Low" rating for Uniqueness; and Vegetated wetland component 1 acre (do not include upland vegetated buffer); and Percent of possible score 35% (round to nearest whole #).

OVERALL ANALYSIS AREA RATING:

III Summary Comments: NA 6

Wetland and Other Waters Surveys Natrium Project Appendix B STREAM FLOW DURATION FIELD ASSESSMENT FORMS TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

November 2015 Appendix B: Streamflow Duration Field Assessment Form Project # / Name Natrium Demonstration Project Assessor JR Address Date 6/21/22 Waterway Name SDAM 1 Coordinates at downstream end (ddd.mm.ss)

Lat.

41°45'14.98" N

Long.

110°36'27.96" W

Reach Boundaries Precipitation w/in 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (cm) 0 Channel Width (m) 2 Disturbed Site / Difficult Situation (Describe in Notes)

Observed Hydrology

% of reach w/observed surface flow____0___

% of reach w/any flow (surface or hyporheic) _0____

of pools observed___0____

Observations Observed Wetland Plants (and indicator status):

None Observed Macroinvertebrates:

Taxon Indicator Status Ephemer optera?

of Individuals Indicators

1. Are aquatic macroinvertebrates present?

Yes No

2. Are 6 or more individuals of the Order Ephemeroptera present?

Yes No

3. Are perennial indicator taxa present? (refer to Table 1)

Yes No

4. Are FACW, OBL, or SAV plants present? (Within 1/2 channel width)

Yes No

5. What is the slope? (In percent, measured for the valley, not the stream)

Conclusions Are aquatic macroinvertebrates present?

(Indicator 1)

If Yes: Are 6 or more individuals of the Order Ephemeroptera present?

(Indicator 2)

If Yes: Are perennial indicator taxa present?

(Indicator 3)

If Yes:

PERENNIAL If No: What is the slope?

(Indicator 5)

Slope < 16%:

INTERMITTENT Slope 16%:

PERENNIAL If No:

INTERMITTENT If No: Are SAV, FACW, or OBL plants present?

(Indicator 4)

If Yes: What is the slope?

(Indicator 5)

Slope < 10.5%:

INTERMITTENT Slope 10.5%:

EPHEMERAL If No:

EPHEMERAL Single Indicators:

Fish Amphibians Finding:

28 Streamflow Duration Assessment Method for the Pacific Northwest Notes: (explanation of any single indicator conclusions, description of disturbances or modifications that may interfere with indicators, etc.)

Difficult Situation:

Describe situation. For disturbed streams, note extent, type, and history of disturbance.

Prolonged Abnormal Rainfall / Snowpack Below Average Above Average Natural or Anthropogenic Disturbance Other: ___________________________

Additional Notes: (sketch of site, description of photos, comments on hydrological observations, etc.) Attach additional sheets as necessary.

Ancillary Information:

Riparian Corridor Erosion and Deposition Floodplain Connectivity Observed Amphibians, Snake, and Fish:

November 2015 Appendix B: Streamflow Duration Field Assessment Form Project # / Name Natrium Demonstration Project Assessor JR Address Date 6/21/22 Waterway Name SDAM 2 Coordinates at downstream end (ddd.mm.ss)

Lat.

41°45'5.07" N

Long.

110°36'25.34" W

Reach Boundaries Precipitation w/in 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (cm) 0 Channel Width (m) 1.5 Disturbed Site / Difficult Situation (Describe in Notes)

Observed Hydrology

% of reach w/observed surface flow____0___

% of reach w/any flow (surface or hyporheic) _0____

of pools observed___0____

Observations Observed Wetland Plants (and indicator status):

None Observed Macroinvertebrates:

Taxon Indicator Status Ephemer optera?

of Individuals Indicators

1. Are aquatic macroinvertebrates present?

Yes No

2. Are 6 or more individuals of the Order Ephemeroptera present?

Yes No

3. Are perennial indicator taxa present? (refer to Table 1)

Yes No

4. Are FACW, OBL, or SAV plants present? (Within 1/2 channel width)

Yes No

5. What is the slope? (In percent, measured for the valley, not the stream)

Conclusions Are aquatic macroinvertebrates present?

(Indicator 1)

If Yes: Are 6 or more individuals of the Order Ephemeroptera present?

(Indicator 2)

If Yes: Are perennial indicator taxa present?

(Indicator 3)

If Yes:

PERENNIAL If No: What is the slope?

(Indicator 5)

Slope < 16%:

INTERMITTENT Slope 16%:

PERENNIAL If No:

INTERMITTENT If No: Are SAV, FACW, or OBL plants present?

(Indicator 4)

If Yes: What is the slope?

(Indicator 5)

Slope < 10.5%:

INTERMITTENT Slope 10.5%:

EPHEMERAL If No:

EPHEMERAL Single Indicators:

Fish Amphibians Finding:

28 Streamflow Duration Assessment Method for the Pacific Northwest Notes: (explanation of any single indicator conclusions, description of disturbances or modifications that may interfere with indicators, etc.)

Difficult Situation:

Describe situation. For disturbed streams, note extent, type, and history of disturbance.

Prolonged Abnormal Rainfall / Snowpack Below Average Above Average Natural or Anthropogenic Disturbance Other: ___________________________

Additional Notes: (sketch of site, description of photos, comments on hydrological observations, etc.) Attach additional sheets as necessary.

Ancillary Information:

Riparian Corridor Erosion and Deposition Floodplain Connectivity Observed Amphibians, Snake, and Fish:

November 2015 Appendix B: Streamflow Duration Field Assessment Form Project # / Name Natrium Assessor JR Address Date 6/21/22 Waterway Name SDAM 4 Coordinates at downstream end (ddd.mm.ss)

Lat.

41°44'38.52" N

Long.

110°36'10.13" W

Reach Boundaries Precipitation w/in 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (cm) 0 Channel Width (m) 1 Disturbed Site / Difficult Situation (Describe in Notes)

Observed Hydrology

% of reach w/observed surface flow____100___

% of reach w/any flow (surface or hyporheic) 100

of pools observed___0____

Observations Observed Wetland Plants (and indicator status):

Juncus balticus (FACW)

Observed Macroinvertebrates:

Taxon Indicator Status Ephemer optera?

of Individuals Indicators

1. Are aquatic macroinvertebrates present?

Yes No

2. Are 6 or more individuals of the Order Ephemeroptera present?

Yes No

3. Are perennial indicator taxa present? (refer to Table 1)

Yes No

4. Are FACW, OBL, or SAV plants present? (Within 1/2 channel width)

Yes No

5. What is the slope? (In percent, measured for the valley, not the stream)

Conclusions Are aquatic macroinvertebrates present?

(Indicator 1)

If Yes: Are 6 or more individuals of the Order Ephemeroptera present?

(Indicator 2)

If Yes: Are perennial indicator taxa present?

(Indicator 3)

If Yes:

PERENNIAL If No: What is the slope?

(Indicator 5)

Slope < 16%:

INTERMITTENT Slope 16%:

PERENNIAL If No:

INTERMITTENT If No: Are SAV, FACW, or OBL plants present?

(Indicator 4)

If Yes: What is the slope?

(Indicator 5)

Slope < 10.5%:

INTERMITTENT Slope 10.5%:

EPHEMERAL If No:

EPHEMERAL Single Indicators:

Fish Amphibians Finding:

Ephemeral Intermittent Perennial 27 Ephemeroptera 2

28 Streamflow Duration Assessment Method for the Pacific Northwest Notes: (explanation of any single indicator conclusions, description of disturbances or modifications that may interfere with indicators, etc.)

Difficult Situation:

Describe situation. For disturbed streams, note extent, type, and history of disturbance.

Prolonged Abnormal Rainfall / Snowpack Below Average Above Average Natural or Anthropogenic Disturbance Other: ___________________________

Additional Notes: (sketch of site, description of photos, comments on hydrological observations, etc.) Attach additional sheets as necessary.

Ancillary Information:

Riparian Corridor Erosion and Deposition Floodplain Connectivity Observed Amphibians, Snake, and Fish:

28 Streamflow Duration Assessment Method for the Pacific Northwest Notes: (explanation of any single indicator conclusions, description of disturbances or modifications that may interfere with indicators, etc.)

Difficult Situation:

Describe situation. For disturbed streams, note extent, type, and history of disturbance.

Prolonged Abnormal Rainfall / Snowpack Below Average Above Average Natural or Anthropogenic Disturbance Other: ___________________________

Additional Notes: (sketch of site, description of photos, comments on hydrological observations, etc.) Attach additional sheets as necessary.

Ancillary Information:

Riparian Corridor Erosion and Deposition Floodplain Connectivity Observed Amphibians, Snake, and Fish:

November 2015 Appendix B: Streamflow Duration Field Assessment Form Project # / Name Natrium Demonstration Project Assessor JR Address Date 6/22/22 Waterway Name SDAM 5 Coordinates at downstream end (ddd.mm.ss)

Lat.

41°45'17.87" N

Long.

110°36'7.16" W

Reach Boundaries Precipitation w/in 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (cm) 0 Channel Width (m) 5 Disturbed Site / Difficult Situation (Describe in Notes)

Observed Hydrology

% of reach w/observed surface flow____100___

% of reach w/any flow (surface or hyporheic) 100

of pools observed___0____

Observations Observed Wetland Plants (and indicator status):

Alopecurus pratensis (FACW)

Observed Macroinvertebrates:

Taxon Indicator Status Ephemer optera?

of Individuals Indicators

1. Are aquatic macroinvertebrates present?

Yes No

2. Are 6 or more individuals of the Order Ephemeroptera present?

Yes No

3. Are perennial indicator taxa present? (refer to Table 1)

Yes No

4. Are FACW, OBL, or SAV plants present? (Within 1/2 channel width)

Yes No

5. What is the slope? (In percent, measured for the valley, not the stream)

Conclusions Are aquatic macroinvertebrates present?

(Indicator 1)

If Yes: Are 6 or more individuals of the Order Ephemeroptera present?

(Indicator 2)

If Yes: Are perennial indicator taxa present?

(Indicator 3)

If Yes:

PERENNIAL If No: What is the slope?

(Indicator 5)

Slope < 16%:

INTERMITTENT Slope 16%:

PERENNIAL If No:

INTERMITTENT If No: Are SAV, FACW, or OBL plants present?

(Indicator 4)

If Yes: What is the slope?

(Indicator 5)

Slope < 10.5%:

INTERMITTENT Slope 10.5%:

EPHEMERAL If No:

EPHEMERAL Single Indicators:

Fish Amphibians Finding:

Ephemeral Intermittent Perennial 27 Ephemeroptera

~6 2

28 Streamflow Duration Assessment Method for the Pacific Northwest Notes: (explanation of any single indicator conclusions, description of disturbances or modifications that may interfere with indicators, etc.)

Difficult Situation:

Describe situation. For disturbed streams, note extent, type, and history of disturbance.

Prolonged Abnormal Rainfall / Snowpack Below Average Above Average Natural or Anthropogenic Disturbance Other: ___________________________

Additional Notes: (sketch of site, description of photos, comments on hydrological observations, etc.) Attach additional sheets as necessary.

Ancillary Information:

Riparian Corridor Erosion and Deposition Floodplain Connectivity Observed Amphibians, Snake, and Fish:

November 2015 Appendix B: Streamflow Duration Field Assessment Form Project # / Name Natrium Assessor JR Address Date 6/22/22 Waterway Name SDAM 7 Coordinates at downstream end (ddd.mm.ss)

Lat.

41°44'10.84" N

Long.

110°35'10.36" W

Reach Boundaries Precipitation w/in 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (cm) 0 Channel Width (m) 4 Disturbed Site / Difficult Situation (Describe in Notes)

Observed Hydrology

% of reach w/observed surface flow____0___

% of reach w/any flow (surface or hyporheic) 0

of pools observed___0____

Observations Observed Wetland Plants (and indicator status):

Juncus balticus (FACW)

Salicornia rubra (OBL)

Observed Macroinvertebrates:

Taxon Indicator Status Ephemer optera?

of Individuals Indicators

1. Are aquatic macroinvertebrates present?

Yes No

2. Are 6 or more individuals of the Order Ephemeroptera present?

Yes No

3. Are perennial indicator taxa present? (refer to Table 1)

Yes No

4. Are FACW, OBL, or SAV plants present? (Within 1/2 channel width)

Yes No

5. What is the slope? (In percent, measured for the valley, not the stream)

Conclusions Are aquatic macroinvertebrates present?

(Indicator 1)

If Yes: Are 6 or more individuals of the Order Ephemeroptera present?

(Indicator 2)

If Yes: Are perennial indicator taxa present?

(Indicator 3)

If Yes:

PERENNIAL If No: What is the slope?

(Indicator 5)

Slope < 16%:

INTERMITTENT Slope 16%:

PERENNIAL If No:

INTERMITTENT If No: Are SAV, FACW, or OBL plants present?

(Indicator 4)

If Yes: What is the slope?

(Indicator 5)

Slope < 10.5%:

INTERMITTENT Slope 10.5%:

EPHEMERAL If No:

EPHEMERAL Single Indicators:

Fish Amphibians Finding:

Ephemeral Intermittent Perennial 27 2

28 Streamflow Duration Assessment Method for the Pacific Northwest Notes: (explanation of any single indicator conclusions, description of disturbances or modifications that may interfere with indicators, etc.)

Difficult Situation:

Describe situation. For disturbed streams, note extent, type, and history of disturbance.

Prolonged Abnormal Rainfall / Snowpack Below Average Above Average Natural or Anthropogenic Disturbance Other: ___________________________

Additional Notes: (sketch of site, description of photos, comments on hydrological observations, etc.) Attach additional sheets as necessary.

Ancillary Information:

Riparian Corridor Erosion and Deposition Floodplain Connectivity Observed Amphibians, Snake, and Fish:

November 2015 Appendix B: Streamflow Duration Field Assessment Form Project # / Name Natrium Demonstration Project Assessor JR Address Date 6/22/22 Waterway Name SDAM 8 Coordinates at downstream end (ddd.mm.ss)

Lat.

41°43'57.21" N

Long.

110°34'10.23" W

Reach Boundaries Precipitation w/in 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (cm) 0 Channel Width (m) 2 Disturbed Site / Difficult Situation (Describe in Notes)

Observed Hydrology

% of reach w/observed surface flow____100___

% of reach w/any flow (surface or hyporheic) 100

of pools observed___0____

Observations Observed Wetland Plants (and indicator status):

Juncus balticus (FACW)

Carex SP Alopecurus pratensis (FACW)

Observed Macroinvertebrates:

Taxon Indicator Status Ephemer optera?

of Individuals Indicators

1. Are aquatic macroinvertebrates present?

Yes No

2. Are 6 or more individuals of the Order Ephemeroptera present?

Yes No

3. Are perennial indicator taxa present? (refer to Table 1)

Yes No

4. Are FACW, OBL, or SAV plants present? (Within 1/2 channel width)

Yes No

5. What is the slope? (In percent, measured for the valley, not the stream)

Conclusions Are aquatic macroinvertebrates present?

(Indicator 1)

If Yes: Are 6 or more individuals of the Order Ephemeroptera present?

(Indicator 2)

If Yes: Are perennial indicator taxa present?

(Indicator 3)

If Yes:

PERENNIAL If No: What is the slope?

(Indicator 5)

Slope < 16%:

INTERMITTENT Slope 16%:

PERENNIAL If No:

INTERMITTENT If No: Are SAV, FACW, or OBL plants present?

(Indicator 4)

If Yes: What is the slope?

(Indicator 5)

Slope < 10.5%:

INTERMITTENT Slope 10.5%:

EPHEMERAL If No:

EPHEMERAL Single Indicators:

Fish Amphibians Finding:

Ephemeral Intermittent Perennial 27 2

28 Streamflow Duration Assessment Method for the Pacific Northwest Notes: (explanation of any single indicator conclusions, description of disturbances or modifications that may interfere with indicators, etc.)

Difficult Situation:

Describe situation. For disturbed streams, note extent, type, and history of disturbance.

Prolonged Abnormal Rainfall / Snowpack Below Average Above Average Natural or Anthropogenic Disturbance Other: ___________________________

Additional Notes: (sketch of site, description of photos, comments on hydrological observations, etc.) Attach additional sheets as necessary.

Ancillary Information:

Riparian Corridor Erosion and Deposition Floodplain Connectivity Observed Amphibians, Snake, and Fish:

November 2015 Appendix B: Streamflow Duration Field Assessment Form Project # / Name Natrium Demonstration Project Assessor JR Address Date 6/22/22 Waterway Name SDAM 9 Coordinates at downstream end (ddd.mm.ss)

Lat.

41°43'58.80"N N

Long.

110°34'22.55" W

Reach Boundaries Precipitation w/in 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (cm) 0 Channel Width (m) 1 Disturbed Site / Difficult Situation (Describe in Notes)

Observed Hydrology

% of reach w/observed surface flow____0___

% of reach w/any flow (surface or hyporheic) 0

of pools observed___0____

Observations Observed Wetland Plants (and indicator status):

Salicornia rubra (OBL)

Observed Macroinvertebrates:

Taxon Indicator Status Ephemer optera?

of Individuals Indicators

1. Are aquatic macroinvertebrates present?

Yes No

2. Are 6 or more individuals of the Order Ephemeroptera present?

Yes No

3. Are perennial indicator taxa present? (refer to Table 1)

Yes No

4. Are FACW, OBL, or SAV plants present? (Within 1/2 channel width)

Yes No

5. What is the slope? (In percent, measured for the valley, not the stream)

Conclusions Are aquatic macroinvertebrates present?

(Indicator 1)

If Yes: Are 6 or more individuals of the Order Ephemeroptera present?

(Indicator 2)

If Yes: Are perennial indicator taxa present?

(Indicator 3)

If Yes:

PERENNIAL If No: What is the slope?

(Indicator 5)

Slope < 16%:

INTERMITTENT Slope 16%:

PERENNIAL If No:

INTERMITTENT If No: Are SAV, FACW, or OBL plants present?

(Indicator 4)

If Yes: What is the slope?

(Indicator 5)

Slope < 10.5%:

INTERMITTENT Slope 10.5%:

EPHEMERAL If No:

EPHEMERAL Single Indicators:

Fish Amphibians Finding:

Ephemeral Intermittent Perennial 27 2

28 Streamflow Duration Assessment Method for the Pacific Northwest Notes: (explanation of any single indicator conclusions, description of disturbances or modifications that may interfere with indicators, etc.)

Difficult Situation:

Describe situation. For disturbed streams, note extent, type, and history of disturbance.

Prolonged Abnormal Rainfall / Snowpack Below Average Above Average Natural or Anthropogenic Disturbance Other: ___________________________

Additional Notes: (sketch of site, description of photos, comments on hydrological observations, etc.) Attach additional sheets as necessary.

Ancillary Information:

Riparian Corridor Erosion and Deposition Floodplain Connectivity Observed Amphibians, Snake, and Fish:

November 2015 Appendix B: Streamflow Duration Field Assessment Form Project # / Name Natrium Demonstration Project Assessor JR Address Date 6/23/22 Waterway Name SDAM 10 Coordinates at downstream end (ddd.mm.ss)

Lat. 41°41'43.67" N

Long.

110°33'21.48" W

Reach Boundaries Precipitation w/in 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (cm) 0 Channel Width (m) 2.5 Disturbed Site / Difficult Situation (Describe in Notes)

Observed Hydrology

% of reach w/observed surface flow____100___

% of reach w/any flow (surface or hyporheic) 100

of pools observed___many____

Observations Observed Wetland Plants (and indicator status):

Juncus balticus (FACW)

Typha latifolia (OBL)

Carex Sp Observed Macroinvertebrates:

Taxon Indicator Status Ephemer optera?

of Individuals Indicators

1. Are aquatic macroinvertebrates present?

Yes No

2. Are 6 or more individuals of the Order Ephemeroptera present?

Yes No

3. Are perennial indicator taxa present? (refer to Table 1)

Yes No

4. Are FACW, OBL, or SAV plants present? (Within 1/2 channel width)

Yes No

5. What is the slope? (In percent, measured for the valley, not the stream)

Conclusions Are aquatic macroinvertebrates present?

(Indicator 1)

If Yes: Are 6 or more individuals of the Order Ephemeroptera present?

(Indicator 2)

If Yes: Are perennial indicator taxa present?

(Indicator 3)

If Yes:

PERENNIAL If No: What is the slope?

(Indicator 5)

Slope < 16%:

INTERMITTENT Slope 16%:

PERENNIAL If No:

INTERMITTENT If No: Are SAV, FACW, or OBL plants present?

(Indicator 4)

If Yes: What is the slope?

(Indicator 5)

Slope < 10.5%:

INTERMITTENT Slope 10.5%:

EPHEMERAL If No:

EPHEMERAL Single Indicators:

Fish Amphibians Finding:

Ephemeral Intermittent Perennial 27 2

28 Streamflow Duration Assessment Method for the Pacific Northwest Notes: (explanation of any single indicator conclusions, description of disturbances or modifications that may interfere with indicators, etc.)

Difficult Situation:

Describe situation. For disturbed streams, note extent, type, and history of disturbance.

Prolonged Abnormal Rainfall / Snowpack Below Average Above Average Natural or Anthropogenic Disturbance Other: ___________________________

Additional Notes: (sketch of site, description of photos, comments on hydrological observations, etc.) Attach additional sheets as necessary.

Ancillary Information:

Riparian Corridor Erosion and Deposition Floodplain Connectivity Observed Amphibians, Snake, and Fish:

November 2015 Appendix B: Streamflow Duration Field Assessment Form Project # / Name Natrium Demonstration Project Assessor JR Address Date 6/22/22 Waterway Name SDAM 11 Coordinates at downstream end (ddd.mm.ss)

Lat. 41°41'43.57 N

Long.

110°33'28.20" W

Reach Boundaries Precipitation w/in 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (cm) 0 Channel Width (m) 3 Disturbed Site / Difficult Situation (Describe in Notes)

Observed Hydrology

% of reach w/observed surface flow____0___

% of reach w/any flow (surface or hyporheic) 0

of pools observed___0___

Observations Observed Wetland Plants (and indicator status):

None Observed Macroinvertebrates:

Taxon Indicator Status Ephemer optera?

of Individuals Indicators

1. Are aquatic macroinvertebrates present?

Yes No

2. Are 6 or more individuals of the Order Ephemeroptera present?

Yes No

3. Are perennial indicator taxa present? (refer to Table 1)

Yes No

4. Are FACW, OBL, or SAV plants present? (Within 1/2 channel width)

Yes No

5. What is the slope? (In percent, measured for the valley, not the stream)

Conclusions Are aquatic macroinvertebrates present?

(Indicator 1)

If Yes: Are 6 or more individuals of the Order Ephemeroptera present?

(Indicator 2)

If Yes: Are perennial indicator taxa present?

(Indicator 3)

If Yes:

PERENNIAL If No: What is the slope?

(Indicator 5)

Slope < 16%:

INTERMITTENT Slope 16%:

PERENNIAL If No:

INTERMITTENT If No: Are SAV, FACW, or OBL plants present?

(Indicator 4)

If Yes: What is the slope?

(Indicator 5)

Slope < 10.5%:

INTERMITTENT Slope 10.5%:

EPHEMERAL If No:

EPHEMERAL Single Indicators:

Fish Amphibians Finding:

28 Streamflow Duration Assessment Method for the Pacific Northwest Notes: (explanation of any single indicator conclusions, description of disturbances or modifications that may interfere with indicators, etc.)

Difficult Situation:

Describe situation. For disturbed streams, note extent, type, and history of disturbance.

Prolonged Abnormal Rainfall / Snowpack Below Average Above Average Natural or Anthropogenic Disturbance Other: ___________________________

Additional Notes: (sketch of site, description of photos, comments on hydrological observations, etc.) Attach additional sheets as necessary.

Ancillary Information:

Riparian Corridor Erosion and Deposition Floodplain Connectivity Observed Amphibians, Snake, and Fish:

November 2015 Appendix B: Streamflow Duration Field Assessment Form Project # / Name Natrium Demonstration Project Assessor JR Address Date 6/23/22 Waterway Name SDAM 12 & 13 Coordinates at downstream end (ddd.mm.ss)

Lat. 41°41'44.04" N

Long.

110°33'32.89" W

Reach Boundaries Precipitation w/in 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (cm) 0 Channel Width (m) 4, 5 Disturbed Site / Difficult Situation (Describe in Notes)

Observed Hydrology

% of reach w/observed surface flow____0___

% of reach w/any flow (surface or hyporheic) 0

of pools observed___0___

Observations Observed Wetland Plants (and indicator status):

None Observed Macroinvertebrates:

Taxon Indicator Status Ephemer optera?

of Individuals Indicators

1. Are aquatic macroinvertebrates present?

Yes No

2. Are 6 or more individuals of the Order Ephemeroptera present?

Yes No

3. Are perennial indicator taxa present? (refer to Table 1)

Yes No

4. Are FACW, OBL, or SAV plants present? (Within 1/2 channel width)

Yes No

5. What is the slope? (In percent, measured for the valley, not the stream)

Conclusions Are aquatic macroinvertebrates present?

(Indicator 1)

If Yes: Are 6 or more individuals of the Order Ephemeroptera present?

(Indicator 2)

If Yes: Are perennial indicator taxa present?

(Indicator 3)

If Yes:

PERENNIAL If No: What is the slope?

(Indicator 5)

Slope < 16%:

INTERMITTENT Slope 16%:

PERENNIAL If No:

INTERMITTENT If No: Are SAV, FACW, or OBL plants present?

(Indicator 4)

If Yes: What is the slope?

(Indicator 5)

Slope < 10.5%:

INTERMITTENT Slope 10.5%:

EPHEMERAL If No:

EPHEMERAL Single Indicators:

Fish Amphibians Finding:

Ephemeral Intermittent Perennial 27 1

28 Streamflow Duration Assessment Method for the Pacific Northwest Notes: (explanation of any single indicator conclusions, description of disturbances or modifications that may interfere with indicators, etc.)

Difficult Situation:

Describe situation. For disturbed streams, note extent, type, and history of disturbance.

Prolonged Abnormal Rainfall / Snowpack Below Average Above Average Natural or Anthropogenic Disturbance Other: ___________________________

Additional Notes: (sketch of site, description of photos, comments on hydrological observations, etc.) Attach additional sheets as necessary.

Ancillary Information:

Riparian Corridor Erosion and Deposition Floodplain Connectivity Observed Amphibians, Snake, and Fish:

November 2015 Appendix B: Streamflow Duration Field Assessment Form Project # / Name Natrium Demonstration Project Assessor JR Address Date 6/23/22 Waterway Name SDAM 14 Coordinates at downstream end (ddd.mm.ss)

Lat. 41°43'55.02" N

Long.

110°33'50.10" W

Reach Boundaries Precipitation w/in 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (cm) 0 Channel Width (m) 4 Disturbed Site / Difficult Situation (Describe in Notes)

Observed Hydrology

% of reach w/observed surface flow____0___

% of reach w/any flow (surface or hyporheic) 0

of pools observed___0___

Observations Observed Wetland Plants (and indicator status):

Juncus balticus (FACW)

Carex Sp Observed Macroinvertebrates:

Taxon Indicator Status Ephemer optera?

of Individuals Indicators

1. Are aquatic macroinvertebrates present?

Yes No

2. Are 6 or more individuals of the Order Ephemeroptera present?

Yes No

3. Are perennial indicator taxa present? (refer to Table 1)

Yes No

4. Are FACW, OBL, or SAV plants present? (Within 1/2 channel width)

Yes No

5. What is the slope? (In percent, measured for the valley, not the stream)

Conclusions Are aquatic macroinvertebrates present?

(Indicator 1)

If Yes: Are 6 or more individuals of the Order Ephemeroptera present?

(Indicator 2)

If Yes: Are perennial indicator taxa present?

(Indicator 3)

If Yes:

PERENNIAL If No: What is the slope?

(Indicator 5)

Slope < 16%:

INTERMITTENT Slope 16%:

PERENNIAL If No:

INTERMITTENT If No: Are SAV, FACW, or OBL plants present?

(Indicator 4)

If Yes: What is the slope?

(Indicator 5)

Slope < 10.5%:

INTERMITTENT Slope 10.5%:

EPHEMERAL If No:

EPHEMERAL Single Indicators:

Fish Amphibians Finding:

Ephemeral Intermittent Perennial 27 3

28 Streamflow Duration Assessment Method for the Pacific Northwest Notes: (explanation of any single indicator conclusions, description of disturbances or modifications that may interfere with indicators, etc.)

Difficult Situation:

Describe situation. For disturbed streams, note extent, type, and history of disturbance.

Prolonged Abnormal Rainfall / Snowpack Below Average Above Average Natural or Anthropogenic Disturbance Other: ___________________________

Additional Notes: (sketch of site, description of photos, comments on hydrological observations, etc.) Attach additional sheets as necessary.

Ancillary Information:

Riparian Corridor Erosion and Deposition Floodplain Connectivity Observed Amphibians, Snake, and Fish:

November 2015 Appendix B: Streamflow Duration Field Assessment Form Project # / Name Natrium Demonstration Project Assessor JR Address Date 6/24/22 Waterway Name SDAM 15 Coordinates at downstream end (ddd.mm.ss)

Lat. 41°42'40.82" N

Long.

110°33'22.10" W

Reach Boundaries Precipitation w/in 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (cm) <1 Channel Width (m) 3 Disturbed Site / Difficult Situation (Describe in Notes)

Observed Hydrology

% of reach w/observed surface flow____0___

% of reach w/any flow (surface or hyporheic) 0

of pools observed___0___

Observations Observed Wetland Plants (and indicator status):

Juncus balticus (FACW)

Observed Macroinvertebrates:

Taxon Indicator Status Ephemer optera?

of Individuals Indicators

1. Are aquatic macroinvertebrates present?

Yes No

2. Are 6 or more individuals of the Order Ephemeroptera present?

Yes No

3. Are perennial indicator taxa present? (refer to Table 1)

Yes No

4. Are FACW, OBL, or SAV plants present? (Within 1/2 channel width)

Yes No

5. What is the slope? (In percent, measured for the valley, not the stream)

Conclusions Are aquatic macroinvertebrates present?

(Indicator 1)

If Yes: Are 6 or more individuals of the Order Ephemeroptera present?

(Indicator 2)

If Yes: Are perennial indicator taxa present?

(Indicator 3)

If Yes:

PERENNIAL If No: What is the slope?

(Indicator 5)

Slope < 16%:

INTERMITTENT Slope 16%:

PERENNIAL If No:

INTERMITTENT If No: Are SAV, FACW, or OBL plants present?

(Indicator 4)

If Yes: What is the slope?

(Indicator 5)

Slope < 10.5%:

INTERMITTENT Slope 10.5%:

EPHEMERAL If No:

EPHEMERAL Single Indicators:

Fish Amphibians Finding:

Ephemeral Intermittent Perennial 27 2

28 Streamflow Duration Assessment Method for the Pacific Northwest Notes: (explanation of any single indicator conclusions, description of disturbances or modifications that may interfere with indicators, etc.)

Difficult Situation:

Describe situation. For disturbed streams, note extent, type, and history of disturbance.

Prolonged Abnormal Rainfall / Snowpack Below Average Above Average Natural or Anthropogenic Disturbance Other: ___________________________

Additional Notes: (sketch of site, description of photos, comments on hydrological observations, etc.) Attach additional sheets as necessary.

Ancillary Information:

Riparian Corridor Erosion and Deposition Floodplain Connectivity Observed Amphibians, Snake, and Fish:

November 2015 Appendix B: Streamflow Duration Field Assessment Form Project # / Name Natrium Demonstration Project Assessor JR Address Date 6/23/22 Waterway Name SDAM 16 Coordinates at downstream end (ddd.mm.ss)

Lat. 41°43'58.76" N

Long.

110°34'25.01" W

Reach Boundaries Precipitation w/in 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (cm) 0 Channel Width (m) 1 Disturbed Site / Difficult Situation (Describe in Notes)

Observed Hydrology

% of reach w/observed surface flow____0___

% of reach w/any flow (surface or hyporheic) 0

of pools observed___0___

Observations Observed Wetland Plants (and indicator status):

None Observed Macroinvertebrates:

Taxon Indicator Status Ephemer optera?

of Individuals Indicators

1. Are aquatic macroinvertebrates present?

Yes No

2. Are 6 or more individuals of the Order Ephemeroptera present?

Yes No

3. Are perennial indicator taxa present? (refer to Table 1)

Yes No

4. Are FACW, OBL, or SAV plants present? (Within 1/2 channel width)

Yes No

5. What is the slope? (In percent, measured for the valley, not the stream)

Conclusions Are aquatic macroinvertebrates present?

(Indicator 1)

If Yes: Are 6 or more individuals of the Order Ephemeroptera present?

(Indicator 2)

If Yes: Are perennial indicator taxa present?

(Indicator 3)

If Yes:

PERENNIAL If No: What is the slope?

(Indicator 5)

Slope < 16%:

INTERMITTENT Slope 16%:

PERENNIAL If No:

INTERMITTENT If No: Are SAV, FACW, or OBL plants present?

(Indicator 4)

If Yes: What is the slope?

(Indicator 5)

Slope < 10.5%:

INTERMITTENT Slope 10.5%:

EPHEMERAL If No:

EPHEMERAL Single Indicators:

Fish Amphibians Finding:

28 Streamflow Duration Assessment Method for the Pacific Northwest Notes: (explanation of any single indicator conclusions, description of disturbances or modifications that may interfere with indicators, etc.)

Difficult Situation:

Describe situation. For disturbed streams, note extent, type, and history of disturbance.

Prolonged Abnormal Rainfall / Snowpack Below Average Above Average Natural or Anthropogenic Disturbance Other: ___________________________

Additional Notes: (sketch of site, description of photos, comments on hydrological observations, etc.) Attach additional sheets as necessary.

Ancillary Information:

Riparian Corridor Erosion and Deposition Floodplain Connectivity Observed Amphibians, Snake, and Fish:

November 2015 Appendix B: Streamflow Duration Field Assessment Form Project # / Name Natrium Demonstration Project Assessor JR Address Date 6/23/22 Waterway Name SDAM 17 Coordinates at downstream end (ddd.mm.ss)

Lat. 41°43'57.79" N

Long.

110°34'22.33" W

Reach Boundaries Precipitation w/in 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (cm) 0 Channel Width (m) 1 Disturbed Site / Difficult Situation (Describe in Notes)

Observed Hydrology

% of reach w/observed surface flow____0___

% of reach w/any flow (surface or hyporheic) 0

of pools observed___0___

Observations Observed Wetland Plants (and indicator status):

Juncus balticus (FACW)

Observed Macroinvertebrates:

Taxon Indicator Status Ephemer optera?

of Individuals Indicators

1. Are aquatic macroinvertebrates present?

Yes No

2. Are 6 or more individuals of the Order Ephemeroptera present?

Yes No

3. Are perennial indicator taxa present? (refer to Table 1)

Yes No

4. Are FACW, OBL, or SAV plants present? (Within 1/2 channel width)

Yes No

5. What is the slope? (In percent, measured for the valley, not the stream)

Conclusions Are aquatic macroinvertebrates present?

(Indicator 1)

If Yes: Are 6 or more individuals of the Order Ephemeroptera present?

(Indicator 2)

If Yes: Are perennial indicator taxa present?

(Indicator 3)

If Yes:

PERENNIAL If No: What is the slope?

(Indicator 5)

Slope < 16%:

INTERMITTENT Slope 16%:

PERENNIAL If No:

INTERMITTENT If No: Are SAV, FACW, or OBL plants present?

(Indicator 4)

If Yes: What is the slope?

(Indicator 5)

Slope < 10.5%:

INTERMITTENT Slope 10.5%:

EPHEMERAL If No:

EPHEMERAL Single Indicators:

Fish Amphibians Finding:

Ephemeral Intermittent Perennial 27 1

28 Streamflow Duration Assessment Method for the Pacific Northwest Notes: (explanation of any single indicator conclusions, description of disturbances or modifications that may interfere with indicators, etc.)

Difficult Situation:

Describe situation. For disturbed streams, note extent, type, and history of disturbance.

Prolonged Abnormal Rainfall / Snowpack Below Average Above Average Natural or Anthropogenic Disturbance Other: ___________________________

Additional Notes: (sketch of site, description of photos, comments on hydrological observations, etc.) Attach additional sheets as necessary.

Ancillary Information:

Riparian Corridor Erosion and Deposition Floodplain Connectivity Observed Amphibians, Snake, and Fish:

November 2015 Appendix B: Streamflow Duration Field Assessment Form Project # / Name Natrium Demonstration Project Assessor HM Address Date 10/19/22 Waterway Name SDAM 18 Coordinates at downstream end (ddd.mm.ss)

Lat. 41°45'2.66" N

Long.

110°36'14.22" W

Reach Boundaries Precipitation w/in 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (cm) 0 Channel Width (m) 1.5 Disturbed Site / Difficult Situation (Describe in Notes)

Observed Hydrology

% of reach w/observed surface flow____0___

% of reach w/any flow (surface or hyporheic) 0

of pools observed___0___

Observations Observed Wetland Plants (and indicator status):

Juncus balticus (FACW)

Observed Macroinvertebrates:

Taxon Indicator Status Ephemer optera?

of Individuals Indicators

1. Are aquatic macroinvertebrates present?

Yes No

2. Are 6 or more individuals of the Order Ephemeroptera present?

Yes No

3. Are perennial indicator taxa present? (refer to Table 1)

Yes No

4. Are FACW, OBL, or SAV plants present? (Within 1/2 channel width)

Yes No

5. What is the slope? (In percent, measured for the valley, not the stream)

Conclusions Are aquatic macroinvertebrates present?

(Indicator 1)

If Yes: Are 6 or more individuals of the Order Ephemeroptera present?

(Indicator 2)

If Yes: Are perennial indicator taxa present?

(Indicator 3)

If Yes:

PERENNIAL If No: What is the slope?

(Indicator 5)

Slope < 16%:

INTERMITTENT Slope 16%:

PERENNIAL If No:

INTERMITTENT If No: Are SAV, FACW, or OBL plants present?

(Indicator 4)

If Yes: What is the slope?

(Indicator 5)

Slope < 10.5%:

INTERMITTENT Slope 10.5%:

EPHEMERAL If No:

EPHEMERAL Single Indicators:

Fish Amphibians Finding:

28 Streamflow Duration Assessment Method for the Pacific Northwest Notes: (explanation of any single indicator conclusions, description of disturbances or modifications that may interfere with indicators, etc.)

Difficult Situation:

Describe situation. For disturbed streams, note extent, type, and history of disturbance.

Prolonged Abnormal Rainfall / Snowpack Below Average Above Average Natural or Anthropogenic Disturbance Other: ___________________________

Additional Notes: (sketch of site, description of photos, comments on hydrological observations, etc.) Attach additional sheets as necessary.

Ancillary Information:

Riparian Corridor Erosion and Deposition Floodplain Connectivity Observed Amphibians, Snake, and Fish:

Wetland and Other Waters Surveys Natrium Project Appendix B WETLAND DETERMINATION DATA FORMS TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/21/22 TerraPower WY WL 1 U J. Rodriguez S32, T21N, R116W Bench Flat 1

34A 41.75161427

-110.60698948 NAD83 Cumberhill-Sandbranch-Poposhia complex, 4 to 15 percent slopes N/A

30 ft 5 ft 5 ft Hordeum jubatum 70 y

FAC Leymus cinereus 10 n

FAC 80 30 ft 1

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 1 U 0-16 2.5Y 4/4 98 7.5YR 5/8 2

C M

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/21/22 TerraPower WY WL 1 W J. Rodriguez S32, T21N, R116W Depression Concave 0

34A 41.75154763

-110.60690983 NAD83 Cumberhill-Sandbranch-Poposhia complex, 4 to 15 percent slopes PEM

30 ft 5 ft 5 ft Juncus balticus 50 Y

FACW Phragmites australis 30 Y

FACW 80 30 ft Water flows through culvert under road and disperses into wetland 2

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 1 W 0-10 7.5YR 4/1 50 sand 10YR 2/1 50 sand 10-20 7.5YR 4/1 85 7.5YR 5/8 15 C

M sand Many layers of sediment deposit and what appears to be ash

4 0

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/21/22 TerraPower WY WL 2 U J. Rodriguez S2, T20N, R117W Depression Concave 0

34A 41.7482679

-110.60389481 NAD83 Cumberhill-Sandbranch-Poposhia complex, 4 to 15 percent slopes N/A

30 ft 5 ft Artemisia tridentata 30 y

NI 30 5 ft Agropyron cristatum 10 y

NI Pascopyrum smithii 30 y

FAC 40 30 ft 1

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/21/22 TerraPower WY WL 2 W J. Rodriguez S2, T20N, R117W Depression Concave 0

34A 41.74823971

-110.6037396 NAD83 Cumberhill-Sandbranch-Poposhia complex, 4 to 15 percent slopes PEM

30 ft 5 ft 5 ft Juncus balticus 70 Y

FACW 70 30 ft Wetland is on edge of what appears to be a seasonally ponded area. Water flows from series of ephemeral rills from the west. Rills are currently dry.

1 1

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 2 W 0-12 2.5Y 3/1 90 7.5YR 5/8 10 C

M clay

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/21/22 TerraPower WY WL 3 U J. Rodriguez S2, T20N, R117W Terrace None 1

34A 41.74449344

-110.60288707 NAD83 Cumberhill-Sandbranch-Poposhia complex, 4 to 15 percent slopes N/A

30 ft 5 ft 5 ft Hordeum jubatum 70 y

FAC Leymus cinerus 5

n FAC 75 30 ft 1

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 3 U 0-16 2.5 YR 4/4 98 7.5YR 5/8 2

C M

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/21/22 TerraPower WY WL 3 W J. Rodriguez S2, T20N, R117W Depression Concave 0

34A 41.74437091

-110.60288015 NAD83 Cumberhill-Sandbranch-Poposhia complex, 4 to 15 percent slopes PEM

30 ft 5 ft 5 ft Juncus balticus 100 Y

FACW 100 30 ft 1

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches)

Color (moist)

% Color (moist)

% Type 1 Loc 2

Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply)

Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3)

Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 3 W 0-3 7.5YR 2.5/1 100 silt clay 3-16 10 YR 3/2 90 7.5 YR 5/8 10 C

M silt clay

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/21/22 TerraPower WY WL 4 U J. Rodriguez S2, T20N, R117W Terrace None 1

34A 41.73925478

-110.60050411 NAD83 Cumberhill-Sandbranch-Poposhia complex, 4 to 15 percent slopes N/A

30 ft 5 ft 5 ft Lepidium perfoliatum 5

n FACU Sedum sp 10 y

NI Festuca idahoensis 40 y

FACU 55 30 ft 0

2 0

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/21/22 TerraPower WY WL 4 W J. Rodriguez S2, T20N, R117W Depression Concave 0

34A 41.7391396

-110.60048256 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft PEM

30 ft 5 ft 5 ft Juncus balticus 80 y

FACW 80 30 ft Wetland is along fringe of open water and adjacent low basin 1

1 100

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 4 W 0-16 2.5Y 4/2 90 7.5YR 5/8 10 C

M clay

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/22/22 TerraPower WY WL 5 U J. Rodriguez S32, T21N, R116W Terrace None 0

34A 41.75512122

-110.6020245 NAD83 Cumberhill-Sandbranch-Poposhia complex, 4 to 15 percent slopes N/A

30 ft 5 ft 5 ft Agropyron intermedium 60 y

NI Alopecurus pratensis 10 n

FACW 70 30 ft 0

1 0

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 5 U 0-9 10YR 2/1 100 Silty clay 9-18 10 YR 3/2 90 7.5YR 5/8 10 C

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/22/22 TerraPower WY WL 5 W J. Rodriguez S32, T21N, R116W Floodplain Concave 0

34A 41.75503484

-110.60195367 NAD83 Cumberhill-Sandbranch-Poposhia complex, 4 to 15 percent slopes PEM

30 ft 5 ft 5 ft Alopecurus pratensis 90 y

FACW 90 30 ft 1

1 100

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 5 W 0-5 10YR 2/1 100 clay 5-18 10YR 3/1 90 7.5YR 5/8 10 C

M clay 4

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/22/22 TerraPower WY WL 6 U J. Rodriguez S32, T21N, R116W Terrace None 1

34A 41.76162022

-110.60558551 NAD83 Cumberhill-Sandbranch-Poposhia complex, 4 to 15 percent slopes N/A

30 ft 5 ft Artemisia tridentata 10 y

NI Chryosamthus viscidiflorus 15 y

NI 25 5 ft Poa secunda 20 y

FACU Achillea millefolium 5

y FACU 25 30 ft 0

4 0

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/22/22 TerraPower WY WL 6 W J. Rodriguez S32, T21N, R116W Pond Shore Flat 1

34A 41.76168122

-110.60562331 NAD83 Cumberhill-Sandbranch-Poposhia complex, 4 to 15 percent slopes PEM

30 ft 5 ft 5 ft Juncus balticus 90 y

FACW 90 30 ft 1

1 100

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 6 W 0-6 5YR 3/1 100 clay loam 6-16 12.5Y 3/1 85 7.5YR 5/8 15 C

M clay loam 4

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/22/22 TerraPower WY WL 7 U J. Rodriguez S12, T20N, R117W Terrace None 0

34A 41.73704821

-110.5917894 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft N/A

30 ft 5 ft Sarcobatus vermiculatus 50 y

FACU 50 5 ft Puccinellia distans 10 y

FACW 10 30 ft 1

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/22/22 TerraPower WY WL 7 W J. Rodriguez S12, T20N, R117W Depression Concave 0

34A 41.73711162

-110.59183546 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft PEM

30 ft 5 ft 5 ft Juncus balticus 20 y

FACW Salicornia rubra 10 n

OBL Triglochin concinna 20 y

OBL Puccinellia nuttalliana 40 y

FACW 90 30 ft 3

3 100

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches)

Color (moist)

% Color (moist)

% Type 1 Loc 2

Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply)

Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3)

Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 7 W 0-3 10YR 4/1 100 silty clay many fine roots 3-18 10YR 4/1 85 7.5YR 5/8 15 C

M silty clay

10 0

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/22/22 TerraPower WY WL 8 U J. Rodriguez S7, T20N, R116W Terrace None 0

34A 41.73458844

-110.56645256 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft N/A

30 ft 5 ft Sarcobatus vermiculatus 50 y

FACU 50 5 ft Poa secunda 20 y

FACU Festuca idahoensis 10 Y

FACU 30 30 ft 0

3 0

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/22/22 TerraPower WY WL 8 W J. Rodriguez S7, T20N, R116W Floodplain Concave 0

34A 41.73464718

-110.5665206 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft PEM

30 ft 5 ft 5 ft Juncus balticus 70 y

FACW Carex sp 10 n

UNK Alopecurus pratensis 20 y

FACW 100 30 ft 2

2 100

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 8 W 0-14 10YR 3/2 90 7.5YR 5/8 10 C

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/22/22 TerraPower WY WL 9 U J. Rodriguez S7, T20N, R116W Terrace None 0

34A 41.73575874

-110.5723536 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft N/A

30 ft 5 ft Sarcobatus vermiculatus 20 y

FACU 20 5 ft Poa secunda 30 y

FACU Festuca idahoensis 20 Y

FACU 50 30 ft 0

3 0

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/22/22 TerraPower WY WL 9 W J. Rodriguez S7, T20N, R116W Depression Concave 0

34A 41.73570375

-110.57248775 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft PEM

30 ft 5 ft 5 ft Juncus balticus 80 y

FACW 80 30 ft 1

1 100

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 9 W 0-16 10YR 4/2 80 7.5YR 5/8 20 C

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/24/22 TerraPower WY WL 10 U J. Rodriguez S12, T20N, R117W Flat Flat 0

34A 41.7359726

-110.58275793 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft N/A

30 ft 5 ft Sarcobatus vermiculatus 15 y

FACU 15 5 ft Hordeum jubatum 10 y

FAC Sedum lanceolatum 25 y

NI 35 30 ft 1

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/23/22 TerraPower WY WL 10 W J. Rodriguez S12, T20N, R117W Floodplain Flat 2

34A 41.73580633

-110.58279876 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft PEM

30 ft 5 ft 5 ft Salicornia rubra 50 y

OBL 50 30 ft 1

1 100

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 10 W 0-4 10YR 4/1 95 7.5 YR 5/8 5

C M

silty clay 4-16 2.5Y 4/2 85 7.5YR 5/8 15 C

M silty clay

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/24/22 TerraPower WY WL 11 U J. Rodriguez S12, T20N, R117W Depression Concave 0

34A 41.73578266

-110.58213425 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft N/A

30 ft 5 ft Sarcobatus vermiculatus 15 y

FACU 15 5 ft Poa secunda 50 y

FACU Agrostis stolonifera 25 y

FACW Achillea millefolium 5

n FACU 80 30 ft 1

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/23/22 TerraPower WY WL 11 W Rodriguez S12, T20N, R117W Floodplain Flat 2

34A 41.73571652

-110.58213246 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft PEM

30 ft 5 ft 5 ft Juncus balticus 60 y

FACW Carex sp 10 n

UNK Agrostis stolonifera 10 n

FACW Bromus inermis 5

n FACU Poa pratensis 5

n FAC 90 30 ft 1

1 100

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 11 W 0-14 10YR 4/2 90 7.5 YR 5/8 10 C

M silty clay

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/23/22 TerraPower WY WL 12 U J. Rodriguez S7, T20N, R116W Terrace Flat 0

34A 41.73532468

-110.57850969 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft N/A

30 ft 5 ft 5 ft Sarcobatus vermiculatus 50 y

FACU Poa secunda 15 y

FACU 65 30 ft 0

2 0

vegetation is difficult to ID to species because of heavy grazing.

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/23/22 TerraPower WY WL 12 W J. Rodriguez S7, T20N, R116W Terrace Flat 3

34A 41.7351916

-110.57859541 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft PEM

30 ft 5 ft 5 ft Juncus balticus 30 y

FACW Carex sp 10 y

UNK 40 30 ft 1

1 100

vegetation is difficult to ID to species because of heavy grazing.

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 12 W 0-14 10YR 4/2 85 7.5 YR 5/8 15 C

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/23/22 TerraPower WY WL 13 U J. Rodriguez S20, T20N, R116W Flat Flat 2

34A 41.70097909

-110.55576278 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft N/A

30 ft 5 ft Sarcobatus vermiculatus 20 y

FACU Chrysothamnus viscidiflorus 20 y

FAC 40 5 ft 30 ft 1

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/23/22 TerraPower WY WL 13 W J. Rodriguez S20, T20N, R116W Floodplain Flat 2

34A 41.70102049000

-110.55569408 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft PEM

30 ft 5 ft 5 ft Juncus balticus 30 y

FACW Typha latifolia 30 y

OBL Carex sp 5

n UNK Alopecurus pratensis 15 y

FACW 80 30 ft Wetland is along fringe of open water and adjacent low basin 3

3 100

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 13 W 0-5 2.5 Y 4/2 100 silty clay 5-18 2.5YR 4/2 97 7.5YR 5/8 3

C M

silty clay

5 0

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/23/22 TerraPower WY WL 14 U J. Rodriguez S7, T20N, R116W Flat Flat 0

34A 41.73495973

-110.56252562 Nad83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft N/A

30 ft 5 ft Sarcobatus vermiculatus 15 y

FAC Artemisia tridentata 15 y

NI 30 5 ft Vulpia myuros 15 y

FACU Poa secunda 15 y

FACU Lepidium perfoliatum 20 y

FACU 50 30 ft 1

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/24/22 TerraPower WY WL 14 W J. Rodriguez S7, T20N, R116W Terrace None 2

34A 41.73493587

-110.56240119 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft PEM

30 ft 5 ft 5 ft Juncus balticus 50 y

FACW 50 30 ft Wetland is along fringe of open water and adjacent low basin 1

1 100

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 14 W 0-5 10 YR 4/1 100 clay loam 5-16 10YR 3/1 90 7.5YR 5/8 10 C

M caly loam

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/24/22 TerraPower WY WL 15 U J. Rodriguez S17, T20N, R116W Terrace Flat 0

34A 41.71102698

-110.55610404 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft N/A

30 ft 5 ft Artemisia tridentata 20 y

NI Chrysothamnus viscidiflorus 20 y

NI 40 5 ft Poa secunda 20 Y

FACU 20 30 ft 0

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

US Army Corps of Engineers Arid West - Version 2.0 WETLAND DETERMINATION DATA FORM - Arid West Region Project/Site: City/County: Sampling Date:

Applicant/Owner: State: Sampling Point:

Investigator(s): Section, Township, Range:

Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%):

Subregion (LRR): Lat: Long: Datum:

Soil Map Unit Name: NWI classification:

Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.)

Are Vegetation, Soil, or Hydrology significantly disturbed? Are Normal Circumstances present? Yes No Are Vegetation, Soil, or Hydrology naturally problematic? (If needed, explain any answers in Remarks.)

SUMMARY

OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.

Hydrophytic Vegetation Present?

Yes No Hydric Soil Present?

Yes No Wetland Hydrology Present?

Yes No Is the Sampled Area within a Wetland? Yes No Remarks:

VEGETATION - Use scientific names of plants.

Dominance Test worksheet:

Number of Dominant Species That Are OBL, FACW, or FAC: (A)

Total Number of Dominant Species Across All Strata:

(B)

Percent of Dominant Species That Are OBL, FACW, or FAC: (A/B)

Prevalence Index worksheet:

Total % Cover of: Multiply by:

OBL species x 1 =

FACW species x 2 =

FAC species x 3 =

FACU species x 4 =

UPL species x 5 =

Column Totals: (A) (B)

Prevalence Index = B/A =

Hydrophytic Vegetation Indicators:

Dominance Test is >50%

Prevalence Index is 3.0 1

Morphological Adaptations 1 (Provide supporting data in Remarks or on a separate sheet)

Problematic Hydrophytic Vegetation 1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic.

Absolute Dominant Indicator Tree Stratum (Plot size: ) % Cover Species? Status

1.

2.

3.

4.

= Total Cover Sapling/Shrub Stratum (Plot size: )

1.

2.

3.

4.

5.

= Total Cover Herb Stratum (Plot size: )

1.

2.

3.

4.

5.

6.

7.

8.

= Total Cover Woody Vine Stratum (Plot size: )

1.

2.

= Total Cover

% Bare Ground in Herb Stratum % Cover of Biotic Crust Hydrophytic Vegetation Present? Yes No Remarks:

Natrium Demonstration Project Lincoln 6/24/22 TerraPower WY WL 15 W J. Rodriguez S17, T20N, R116W Depression Concave 2

34A 41.71106745

-110.55611891 NAD83 Sandbranch-Monte complex, 0 to 3 percent slopes -- draft PEM

30 ft 5 ft Artemisia tridentata 40 y

NI 40 5 ft Juncus balticus 50 y

FACW 50 30 ft Wetland is along fringe of open water and adjacent low basin 1

2 50 50 50 200 40 90 250 2.8

US Army Corps of Engineers Arid West - Version 2.0 SOIL Sampling Point:

Profile

Description:

(Describe to the depth needed to document the indicator or confirm the absence of indicators.)

Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type 1 Loc 2 Texture Remarks 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.

2Location: PL=Pore Lining, M=Matrix.

Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)

Indicators for Problematic Hydric Soils 3:

Histosol (A1)

Sandy Redox (S5) 1 cm Muck (A9) (LRR C)

Histic Epipedon (A2)

Stripped Matrix (S6) 2 cm Muck (A10) (LRR B)

Black Histic (A3)

Loamy Mucky Mineral (F1)

Reduced Vertic (F18)

Hydrogen Sulfide (A4)

Loamy Gleyed Matrix (F2)

Red Parent Material (TF2)

Stratified Layers (A5) (LRR C)

Depleted Matrix (F3)

Other (Explain in Remarks) 1 cm Muck (A9) (LRR D)

Redox Dark Surface (F6)

Depleted Below Dark Surface (A11)

Depleted Dark Surface (F7)

Thick Dark Surface (A12)

Redox Depressions (F8) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1)

Vernal Pools (F9) wetland hydrology must be present, Sandy Gleyed Matrix (S4) unless disturbed or problematic.

Restrictive Layer (if present):

Type:

Depth (inches):

Hydric Soil Present? Yes No Remarks:

HYDROLOGY Wetland Hydrology Indicators:

Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required)

Surface Water (A1)

Salt Crust (B11)

Water Marks (B1) (Riverine)

High Water Table (A2)

Biotic Crust (B12)

Sediment Deposits (B2) (Riverine)

Saturation (A3)

Aquatic Invertebrates (B13)

Drift Deposits (B3) (Riverine)

Water Marks (B1) (Nonriverine)

Hydrogen Sulfide Odor (C1)

Drainage Patterns (B10)

Sediment Deposits (B2) (Nonriverine)

Oxidized Rhizospheres along Living Roots (C3) Dry-Season Water Table (C2)

Drift Deposits (B3) (Nonriverine)

Presence of Reduced Iron (C4)

Crayfish Burrows (C8)

Surface Soil Cracks (B6)

Recent Iron Reduction in Tilled Soils (C6)

Saturation Visible on Aerial Imagery (C9)

Inundation Visible on Aerial Imagery (B7)

Thin Muck Surface (C7)

Shallow Aquitard (D3)

Water-Stained Leaves (B9)

Other (Explain in Remarks)

FAC-Neutral Test (D5)

Field Observations:

Surface Water Present?

Yes No Depth (inches):

Water Table Present?

Yes No Depth (inches):

Saturation Present?

Yes No Depth (inches):

(includes capillary fringe)

Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:

Remarks:

WL 15 W 0-4 10 YR 4/3 100 clay loam 4-16 10YR 4/2 90 7.5YR 5/8 10 C

M caly loam

Wetlands and Other Waters Surveys Natrium Project Appendix C APPENDIX C PHOTOGRAPHIC RECORD TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

Stream 1 Ephemeral Channel Width:

2m Stream 2 Ephemeral Channel Width:

1.5m Stream 4 Perennial Channel Width:

1m Stream 5 Perennial Channel Width:

5m Stream 7 Intermittent Channel Width:

4m Stream 8 Perennial Channel Width:

Stream 9 Ephemeral Channel Width:

1m Stream 10 Perennial Channel Width:

2.5m Stream 11 Ephemeral Channel Width:

3m Stream 12 Ephemeral Channel Width:

4m Stream 13 Ephemeral Channel Width:

5m Stream 14 Intermittent Channel Width:

Stream 15 Ephemeral Channel Width:

Wetland 1 Wetland Type:

Emergent Wetland 2 Wetland Type:

Emergent Water source: Ephemeral stream outside study area Water source: Seasonally ponded area Wetland 3 Wetland Type:

Emergent Wetland 4 Wetland Type:

Emergent Water source: Intermittent stream outside study area Water source: Seasonally ponded area Wetland 5 Wetland Type:

Emergent Wetland 6 Wetland Type:

Emergent Water source: Perennial stream from power plant Water source: Fringe along ponded TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

Wetland 7 Wetland Type:

Emergent Wetland 8 Wetland Type:

Emergent Water source: Ephemeral stream Water source: Perennial stream Wetland 9 Wetland Type:

Emergent Wetland 10 Wetland Type:

Emergent Water source: Intermittent stream Water source: Ephemeral stream Wetland 11 Wetland Type:

Emergent Wetland 12 Wetland Type:

Wetland 13 Wetland Type:

Emergent Wetland 14 Wetland Type:

Emergent Water source: Perennial stream Water source: Intermittent stream Wetland 15 Wetland Type:

ML25024A143

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