APPENDIX F-I.2 

Ivanpah Dry Lake 

Huffman-Broadway Group, Inc.

Environmental Consultants

Investigation of the Presence of Wetlands and

Other Waters of the United States

DesertXpress Project 

HUC 8 Ivanpah - Pahrump Valleys Watershed Draining to 

Ivanpah Dry Lake 

San Bernardino County, California & Clark County, Nevada 

July 2010 

HBG

F-I.2-1
Prepared for

DESERTXPRESS ENTERPRISES, LLC

6750 Via Austi Parkway 

Suite 250 

Las Vegas, NV 89119

By

HUFFMAN-BROADWAY GROUP, INC. 

828 Mission Avenue 

San Rafael, CA 94901 

F-I.2-2
TABLE OF CONTENTS

1.0 INTRODUCTION.......................................................................................................... 1

1.1 PROJECT PURPOSE AND SCOPE OF WORK ..................................................................................... 1

1.2 CONTACT INFORMATION .............................................................................................................. 2

1.3 STUDY AREA................................................................................................................................ 2

1.4 ENVIRONMENTAL SETTING ........................................................................................................... 2

1.4.1 Topography............................................................................................................................. 3

1.4.2 Land Use................................................................................................................................. 3

1.4.3 Geology and Soils................................................................................................................... 3

1.4.4 Biological Resources.............................................................................................................. 4

1.4.5 Climate ................................................................................................................................... 4

1.4.6 Hydrology ............................................................................................................................... 5

1.5 DISCLAIMER ................................................................................................................................. 5

2.0 REGULATORY FRAMEWORK................................................................................... 6

2.1 DEFINITION OF WETLANDS AND OTHER WATERS OF THE U.S....................................................... 6

2.2 LIMITS OF JURISDICTION............................................................................................................... 7

2.3 IDENTIFICATION OF ORDINARY HIGH WATER MARKS (OHWM).................................................. 7

2.4 WETLANDS DELINEATION CRITERIA ............................................................................................. 9

2.4.1 Wetland Hydrology............................................................................................................... 10

2.4.2 Hydric Soils.......................................................................................................................... 12

2.4.3 Prevalence of Wetland Vegetation........................................................................................ 15

3.0 DELINEATION METHOD ..........................................................................................18

3.1 OBJECTIVE AND ESTABLISHMENT OF STUDY AREA BOUNDARY ................................................. 18

3.2 STUDY AREA RECONNAISSANCE ................................................................................................ 18

3.3 WETLANDS IDENTIFICATION AND DELINEATION ......................................................................... 19

3.3.1 Dominance of Wetland Vegetation ....................................................................................... 19

3.3.2 Presence of Hydric Soil Indicators....................................................................................... 19

3.3.3 Presence of Wetland Hydrology Indicators.......................................................................... 19

3.4 IDENTIFICATION AND DELINEATION OF OTHER WATERS............................................................. 20

3.5 MAPPING.................................................................................................................................... 21

4.0 TECHNICAL FINDINGS ............................................................................................22

4.1 FIELD INDICATORS OF HYDRIC SOILS.......................................................................................... 22

4.2 FIELD INDICATORS OF WETLAND HYDROLOGY CONDITIONS ...................................................... 22

4.2.1 Field Indicators of Surface Flow.......................................................................................... 23

4.2.2 Landscape Features that Support Surface Flow................................................................... 24

4.2.3 Landscape Features with a Recognizable OHWM ............................................................... 25

4.3 FIELD INDICATORS OF WETLAND VEGETATION .......................................................................... 25

4.4. PRESENCE OF WETLAND VEGETATION WITHIN NATURAL AND MANMADE DRAINAGES .............. 26

5.0 AREAS POTENTIALLY SUBJECT TO JURISDICTION ..........................................27

5.1 WETLANDS................................................................................................................................. 27

5.2 OTHER WATERS OF THE U.S....................................................................................................... 27

6.0 CWA JURISDICTIONAL ANALYSIS ........................................................................28

6.1 REGULATORY BACKGROUND...................................................................................................... 28

6.2 REVIEW AREA ............................................................................................................................ 30

6.3 CWA ANALYSIS......................................................................................................................... 30

6.3.1 Are Jurisdictional Waters Present within the Study Area (Rapanos Guidance)?................. 30

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6.3.2 Are There Isolated Waters within the Study Area?............................................................... 32

6.4 ARE NON-JURISDICTIONAL WATERS PRESENT WITHIN THE STUDY AREA? ................................... 35

6.5 JURISDICTIONAL ANALYSIS SUMMARY ....................................................................................... 35

6.6 DISCLAIMER ............................................................................................................................... 37

7.0 REFERENCES...........................................................................................................38

 

LIST OF TABLES

Table 1a Potential Geomorphic Indicators of Ordinary High Water Marks for the 

Arid West

Table 1b Potential Vegetation Indicators of Ordinary High Water Marks for the 

Arid West

Table 2 Wetland Hydrology Indicators

Table 3 Wetland Hydrology Indicators for the Arid West

Table 4 Field Indicators of Hydric Soil Conditions

Table 5 Hydric Soil Indicators for the Arid West

Table 6 Summary of Process for Determining Jurisdiction Over Waters of the 

U.S. Under Section 404 of the Clean Water Act Following EPA and 

Corps Rapanos Guidance

Table 7 Summary of EPA and Corps Rapanos Analysis

Table 8 Interstate / Foreign Commerce Analysis

Table 9 Jurisdictional Analysis Summary

LIST OF EXHIBITS

Exhibit A Figures

Figure 1 DesertXpress Project Alignment Alternatives

Figure 2 Location of Alignment Alternatives Within HUC-8 Watershed

Figure 3 Location of Study Area

Figure 4 Location of Study Area Within HUC-8 / HUC-12 Watersheds

Figures 5-12 Typical Examples of Field Indicators of Active Surface Water Flow and 

Ordinary High Water Marks Found Within Ephemeral Drainages Occurring 

Within the DesertXpress Project Study Area.

Figures 13-42 Examples of Drainages Found Within HUC-8 Watershed

Exhibit B Field Data 

Exhibit B1 Required Corps Waters Data Summary Table

Exhibit B2 Field Data

Exhibit C Representative Areas Potentially Excluded from Corps Jurisdiction 

Based on Corps-EPA Rapanos Guidance, DesertXpress Project, 

HUC 8 Ivanpah-Pahrump Valleys Watershed Draining to Ivanpah 

Dry Lake

Exhibit D Hydrology Maps for CWA Jurisdictional Analysis

This report should be cited as: Huffman-Broadway Group, Inc. 2010. Investigation of the Presence of 

Wetlands and Other Waters of the United States, DesertXpress Project, HUC 8 Ivanpah - Pahrump Valleys 

Watershed Draining to Ivanpah Dry Lake, San Bernardino County, California & Clark County, Nevada. 

Prepared for DesertXpress Enterprises, LLC, Las Vegas, Nevada. July. 39 pp. plus Exhibits.

F-I.2-4
1.0 INTRODUCTION

1.1 Project Purpose and Scope of Work

DesertXpress Enterprises, LLC (DXE) is proposing to construct and operate a dedicated 

two-tracked high speed passenger railway and associated operations and maintenance 

facilities between Victorville, California, and Las Vegas, Nevada (DesertXpress Project; 

Exhibit A, Figure 1). A Draft Environmental Impact Statement was issued for the project 

in March of 2009 and the Final EIS is nearing completion. A Supplemental Draft EIS has 

been prepared and will be issued shortly to address certain modifications to the proposed 

alignment and station locations made by the Applicant, DXE, in response to various 

comments made on the Draft. The U.S. Department of Transportation, Federal Railroad 

Administration (FRA) is the lead agency responsible for preparing the project 

Environmental Impact Statement (EIS). 

In preparation for the permit phase of the project, DXE has retained Huffman-Broadway 

Group, Inc. (HBG) to investigate the presence of wetlands and other waters potentially 

subject to Corps and EPA regulation under Section 404 of the Clean Water Act (CWA) 

along the DesertXpress Project’s preferred and alternative alignments and study areas for 

the stations and ancillary facilities. 

For the purpose of the jurisdictional delineation study, the proposed DesertXpress Project 

alignments has been divided into six areas using the USGS HUC 8 1

This study was conducted in accordance with Code of Federal Regulations (CFR) 

definitions of jurisdictional waters, the Corps’ 1987 Wetlands Delineation Manual, the 

Corps’ 2008 Regional Supplement to the Corps of Engineers Wetland Delineation 

Manual: Arid West Region (Version 2.0), and supporting guidance documents. The 

remaining portions of Section 1.0 provide project contact information, describe the 

location of the Study Area and provide technical details regarding the general 

environmental conditions found within the Study Area, including relevant technical 

information from the Draft EIS regarding water resource data and biological and cultural 

resource information. Section 2.0 provides regulatory background information and 

details regarding the technical criteria and types of field indicators evaluated for during 

level of watershed

classification. The scope of this report is to evaluate the presence or absence of wetlands 

and waters potentially subject to Corps CWA jurisdiction within the proposed 

DesertXpress Project alternatives and facilities located within the HUC 8 Ivanpah - 

Pahrump Valleys watershed draining to Ivanpah Lake (Exhibit A, Figure 2 and Exhibit 

D). Ivanpah Lake. an ephemeral dry lake with no outlet, is located within the States of 

California and Nevada.

1

 HUC = U.S. Geological Survey (USGS) Hydrologic Unit Code. The Hydrologic Unit system is a standardized 

watershed classification system developed by USGS in the mid 1970s. Hydrologic units are watershed boundaries 

organized in a nested hierarchy by size. They range in size from national regions, to the smaller cataloging units 

(HUCs), which are roughly equivalent to local watershed.

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the study. Section 3.0 provides a detailed description of the methods used during this 

investigation. Section 4.0 provides a description of technical findings and Section 5.0 

describes the types of areas found that potentially may be subject to Corps CWA 

jurisdiction. Section 6.0 is a Clean Water Act jurisdictional analysis using the Rapanos 

Guidance.

HBG is seeking, on behalf of DXE, a Verified Jurisdictional Determination pursuant to 

applicable Corps guidance documents. 

1.2 Contact Information

Project Owner Contact Applicant’s Agent & Wetland 

Regulatory Scientist

DesertXpress Enterprises, LLC

6750 Via Austi Parkway 

Suite 250 

Las Vegas, NV 89119 

Contact: 

Tom Stone 

(702) 491-8940 

tstone@transmaxgroup.com 

Huffman-Broadway Group, Inc 

828 Mission Avenue 

San Rafael, California 94901 

Contact: 

Terry Huffman, Ph.D. 

(415) 925-2000 

thuffman@h-bgroup.com

1.3 Study Area

The Study Area for this investigation is defined as the area where potential ground 

disturbing components of the proposed project would occur based on the alternatives 

identified and analyzed in conjunction with the EIS and Supplemental EIS prepared for 

the DesertXpress Project (Exhibit A, Figure 3). The Study Area begins between 

Mountain Pass on the west and Ivanpah (dry) Lake at the California-Nevada border 

(Exhibit A, Figures 3). 

1.4 Environmental Setting 

The Study Area encompasses those portions of the proposed DesertXpress Project 

alternatives and facilities located between Mountain Pass on the west and Ivanpah (dry) 

Lake at the California-Nevada border (Exhibit A, Figures 3 and 4). In general, the area 

described below comprises “Segment 4” Alternatives 4A and 4C of the alignment and a 

small portion of “Segment 3” Alternative 3B. This portion of the alignment lies within 

the southern portion of the Ivanpah-Pahrump Valleys watershed (HUC-8 watershed 

16060015) and the following HUC-12 watersheds: 

 Wheaton Wash-Frontal Ivanpah Lake – 34,373 acres 

 Kokoweef Canyon-Frontal Ivanpah Lake – 23,868 acres 

 Ivanpah Lake – 23,514 acres 

 Whiskey Spring-Frontal Ivanpah Lake – 31,634 acres 

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These HUC-12 watersheds drain to Ivanpah Lake, a dry lake on the east side of I-15. 

The Segment 3 Alternative 3B Alignment extends North of I-15 from Halloran Summit to 

east of Mountain Pass and the Segment 4 Alternative 4C Alignment leaves I-15 east of 

Mountain Pass and extends in a semi-circular arc west of I-15 on BLM land before rejoining the freeway on the west side of Primm. At its farthest point from I-15, this 

alignment alternative is approximately 6.5 miles west of the freeway. HBG also 

evaluated DEIS Segment 4 Alternative 4A, which passes along the west side of the I-15 

freeway from Mountain Pass to Ivanpah Lake and across the dry bed of the lake. 

1.4.1 Topography

Elevations along Segment 3 Alternative 3B Alignment within the Study range from 

approximately 4,100 feet to 4,450 feet msl. Elevations along the Segment 4 Alternative 

4C Alignment within this Study Area range from approximately 4,450 feet msl just east 

of the Molycorp mine at Mountain Pass to approximately 2,650 feet msl at Primm. The 

roughly 16-mile-long Segment 4A alignment crosses an alluvial fan below the Clark 

Mountain Range as it descends toward Primm. 

1.4.2 Land Use

Both Segment 3 Alternative 3B and Segment 4 Alternative 4A are within the I-15 right of 

way / transportation corridor. Segment 4 Alternative 4C crosses BLM land that lies 

within the Northern and Eastern Mojave Plan (NEMO) planning area, which covers 2.7 

million acres of BLM-managed public lands in eastern San Bernardino and Inyo counties 

and the eastern edge of Mono County. The Plan manages sensitive species and habitats 

on public lands administered by the BLM. 

1.4.3 Geology and Soils

The Alternative Alignment 4C in the Mountain Pass area is underlain by Precambrian age

metamorphic rocks comprised chiefly of injection gneisses and granitic gneisses (epЄ,

pЄg). The maps show that this area consists of former mining prospects, but no mines

are located on the maps in this area. The maps indicate that tunneling through this area

would pass through the metamorphic gneiss unit and cross the inactive North Fault in the 

Clark Mountains. 

On the northeast flank of the Clark Mountains, Alternative Alignment 4C descends over 

younger alluvial fan deposits (Qal) which are underlain at a relatively shallow depth by 

metamorphic rocks. In the Ivanpah Valley, the alignment is underlain by younger valley

alluvium (Qal). 

In the Mountain Pass area, Segment 4 Alternate 4A is underlain by Precambrian age

metamorphic rocks (epЄ, pЄg) composed chiefly of injection gneisses and granitic

gneisses and is also underlain by valley alluvium (Qal) and shallow wash alluvium from

Wheaton Wash (Qal). In Ivanpah Valley, it is underlain by younger valley alluvium (Qal)

and lake deposits from Ivanpah Dry Lake (Ql). 

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These geologic units and associated soils are described below:

Geologic Unit (Symbol[s]) Geologic Age Description

Younger alluvial deposits (Qal) Holocene Unconsolidated valley alluvial deposits of silt, 

sand and gravel; alluvial stream/wash deposits.

Younger lacustrine deposits (Ql) Holocene Lake and playa sediments including clay, silt 

and fine sand; Ivanpah Lake bed sediments.

Metamorphic rocks (epє, pєg) Precambrian Undifferentiated injection gneiss, schist, granitic 

gneiss, granite augen gneiss complex.

Seismicity

According to the DEIS (Circle Point 2009), neither Segment 4 Alternative 4C nor the 

Segment 4 Alternative 4A would cross any active faults. Due to proximate active faults, 

both potential alignments have a moderate to high probability of experiencing strong 

ground shaking. Peak horizontal ground accelerations on the order of 0.3g to 0.4g could 

be anticipated along this project alignment segment near Mountain Pass; accelerations of 

0.4g to 0.6g could be anticipated in the Ivanpah Valley. 

1.4.4 Biological Resources

In the Mountain Pass area, this portion of the DesertXpress Project alignment is 

dominated by blackbrush shrubland. Blackbrush, an evergreen woody shrub, dominates 

the desert shrubland zone between 4,000 and 5,000 feet. Below this elevation lies 

creosote; above, is the zone where sagebrush, pinyon, and juniper grows. 

Just east of Mountain Pass, Alternative Alignment 4C crosses the northeast flank of the 

Clark Mountains through steep, rocky, sparsely vegetated shrubland before descending 

into creosote bush scrub around Wheaton Wash. California Natural Diversity Data Base 

(CNDDB) records indicate suitable habitat for desert bighorn sheep occurs within the 

Study Area. Bighorn sheep maybe especially dependent on springs as a water source in 

the Clark Mountains. 

Suitable habitat for desert tortoises occurs throughout project study area in desert scrub 

habitats. The tortoise was observed in the Study Area during 2007 surveys. 

1.4.5 Climate

The Mojave Desert has an arid to semi-arid climate; the area is in the rain shadow of 

5,000 to 11,000-foot high mountains west of the area. About 2/3 of average annual 

precipitation occurs between November and March, when winter storms move east from 

the Pacific Ocean. Precipitation amounts are higher in the mountains, ranging from about 

4 inches annually in lower areas, with precipitation over 12 inches annually in the highest 

elevations. In the higher mountains, winter precipitation may occur as snow. 

Precipitation in the summer comes as short, intense, and localized thunderstorms; much 

of this rain is lost to evapotranspiration, particularly if the storm is a small one. The 

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farther east in the Mojave, summer storms are more frequent, as they arrive from Arizona 

to the south. (NPS 1999) 

Average annual precipitation ranges from about 4 to 10 inches. (DWR, 2004). 

1.4.6 Hydrology

Surface runoff from small unnamed washes and drainages from the bordering mountains 

extends toward Ivanpah Lake. Named drainages near I-15 include Wheaton Wash and 

Ivanpah Ditch. Drainages within the watershed where the Study Area is located are 

ephemeral.

The Study Area is in the Ivanpah Valley Groundwater Basin (CDWR Basin 6-30). The 

Ivanpah Valley Groundwater Basin covers 311 square miles. The basin underlies a northtrending valley along the California-Nevada border. Quaternary alluvium, which forms 

the primary water-bearing unit within the basin, includes unconsolidated younger alluvial 

fan material underlain by semi-consolidated, older alluvium. Maximum thickness of the 

alluvium is at least 825 feet (DWR 2004). 

DWR Bulletin 118 (2004) describes recharge to the groundwater basin: 

The principal source of recharge to the basin is the percolation of runoff 

through alluvial deposits found in Wheaton Wash and at the base of the 

bordering mountains. Additional recharge may be derived from the 

infiltration of precipitation that falls to the valley floor. Groundwater in the 

alluvium moves, as does surface runoff, towards Ivanpah Lake where a 

pressure zone exist beneath the lacustrine deposits. From Ivanpah Lake, 

groundwater moves northwards into the Nevada portion of the basin. 

Discharge from the basin is mainly through pumping and underflow to the 

Las Vegas Valley to the north.

Several northwest-trending faults may impede the movement of groundwater. 

Among these are the State Line, Ivanpah, and Clark Mountain faults 

(Jennings 1961; DWR 1964). 

FEMA flood maps identify the area including Ivanpah Dry Lake as Zone D. Zone D is 

used to designate areas where there are possible but undetermined flood hazards. In areas 

designated as Zone D, no analysis of flood hazards has been conducted. 

1.5 Disclaimer 

Huffman-Broadway Group, Inc. have conducted a thorough historic review and site 

investigation and made a good-faith effort herein to thoroughly describe and document 

the presence of potential factors that the Corps may consider in determining jurisdiction 

under their CWA jurisdiction as part of the Corps jurisdictional verification / 

determination process, however, DXE reserves the right to challenge or seek revision to 

any areas over which the Corps may assert jurisdiction. 

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2.0 REGULATORY FRAMEWORK

2.1 Definition of Wetlands and Other Waters of the U.S.

Section 404 of the Federal Clean Water Act authorizes the Corps to regulate activities 

that discharge dredged or fill material to wetlands and other waters of the United States. 

As described by EPA’s and the Corps’ regulations (40 CFR § 230.3(s) and 33 CFR § 

328.3(a), respectively), the term “waters of the United States" encompasses the following 

resources: 

(1) All waters which are currently used, or were used in the past, or may be 

susceptible to use in interstate or foreign commerce, including all waters 

which are subject to the ebb and flow of the tide; 

(2) All interstate waters including interstate wetlands; 

(3) All other waters such as intrastate lakes, rivers, streams (including 

intermittent streams), mudflats, sandflats, wetlands, sloughs, prairie 

potholes, wet meadows, playa lakes, or natural ponds, the use, degradation 

or destruction of which could affect interstate or foreign commerce 

including any such waters: 

(i) Which are or could be used by interstate or foreign travelers for 

recreational or other purposes; or 

(ii) From which fish or shellfish are or could be taken and sold in 

interstate or foreign commerce; or 

(iii) Which are used or could be used for industrial purpose by industries 

in interstate commerce 

(4) All impoundments of waters otherwise defined as waters of the United 

States under the definition; 

(5) Tributaries of waters identified in paragraphs (a) (1) through (4) of this 

section; 

(6) The territorial seas; 

(7) Wetlands adjacent to waters (other than waters that are themselves 

wetlands) identified in paragraphs (a) (1) through (6) of this section. 

EPA and the Corps define wetlands as: 

...those areas that are inundated or saturated by surface or ground water at 

a frequency and duration sufficient to support, and that under normal 

circumstances do support, a prevalence of vegetation typically adapted for 

life in saturated soil conditions. Wetlands generally include swamps, 

marshes, bogs, and similar areas. (EPA regulations at 40 CFR § 230.3(t); 

Corps regulations at 33 CFR § 328.3(b)). 

F-I.2-10
2.2 Limits of Jurisdiction 

The following provides the regulatory definitions and criteria followed in determining the 

geographic extent of potential EPA/Corps jurisdiction as applicable to inland waters. 

The geographic limits of relevant federal jurisdiction for non-tidal waters of the U.S. are 

defined as follows at 33 CFR § 328.4(c): 

Non-Tidal Waters of the United States: The limits of jurisdiction in non-tidal 

waters: 

(1) In the absence of adjacent wetlands, the jurisdiction extends to the 

ordinary high water mark. 

(2) When adjacent wetlands are present, the jurisdiction extends beyond the 

ordinary high water mark to the limit of the adjacent wetlands. 

(3) When the water of the United States consists only of wetlands the 

jurisdiction extends to the limit of the wetland. 

The terms “adjacent” and “ordinary high water mark,” used in the above definition, are 

defined at 33 CFR § 328.3 as follows: 

The term adjacent means bordering, contiguous, or neighboring. 

Wetlands separated from other waters of the United States by man-made 

dikes or barriers, natural river berms, beach dunes and the like are 

“adjacent wetlands.” (33 CFR § 328.3(c)) 

The term ordinary high water mark means that line on the shore 

established by the fluctuations of water and indicated by physical 

characteristics such as 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 CFR § 328.3(e)) 

A site must meet certain water, soil, and vegetation criteria to qualify as a jurisdictional 

wetland. The Corps’ 1987 Wetlands Delineation Manual and various regional 

supplements describe these criteria and the methods used to determine whether they are 

met and the geographic extent of wetland areas identified in the field. 

2.3 Identification of Ordinary High Water Marks (OHWM)

The Corps definition of Ordinary High Water Mark (OHWM) provides the criterion by 

which the OHWM line can be identified which consists of “that line on the shore 

established by fluctuations of water and indirect physical characteristics” (33 CFR § 

328.3(e)). The Corps has developed a delineation manual for the identification of 

OHWMs within the Arid West Region, entitled A Field Guide to the Identification of the 

Ordinary High Water Mark (OHWM) in the Arid West Region of the Western United 

States, A Delineation Manual (Lichvar and McColley 2008). Tables 1a and 1b, below 

provide a summarized listing from the manual of indicators associated with areas that 

become flood or ponded, but are not dominated by wetland vegetation and the duration of 

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flooding, ponding and/or near surface soil saturation (≤12 inches) is not sufficient to 

cause hydric soils to form or wetland hydrology conditions to occur. 

Table 1a. Potential Geomorphic Indicators of Ordinary High Water Marks

for the Arid West *

Potential Geomorphic OHWM Indicators 

(A) Below OHW (B) At OHW (C) Above OHW

1. In-stream dunes

2. Crested ripples

3. Flaser bedding

4. Harrow marks

5. Gravel sheets to rippled 

sands 

6. Meander bars

7. Sand tongues

8. Muddy point bars

9. Long gravel bars

10. Cobble bars behind 

obstructions 

11. Scour holes downstream 

of obstructions

12. Obstacle marks

13. Stepped-bed morphology 

in gravel

14. Narrow berms and levees

15. Streaming lineations

16. Dessication / mud cracks

17. Armored mud balls

18. Knick Points

1. Valley flat

2. Active floodplain

3. Benches: low, mid, most prominent 

4. Highest surface of channel bars

5. Top of point bars

6. Break in bank slope

7. Upper limit of sand-sized particles

8. Change in particle size distribution

9. Staining of rocks

10. Exposed root hairs below intact soil layer

11. Silt deposits

12. Litter (organic debris, small twigs and leaves)

13. Drift (organic debris, larger than twigs)

1. Desert pavement

2. Rock varnish

3. Clast weathering

4. Salt splitting

5. Carbonate etching

6. Depositional topography

7. Caliche rubble

8. Soil development

9. Surface color/tone

10. Drainage development

11. Surface relief

12. Surface rounding

* Adapted from A Field Guide to the Identification of the Ordinary High Water Mark (OHWM) in the Arid West 

Region of the Western United States, A Delineation Manual (Lichvar and McColley 2008). 

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Table 1b. Potential Vegetation Indicators of Ordinary High Water Marks

for the Arid West *

Potential Vegetation OHWM Indicators 

(D) Below OHW (E) At OHW (F) Above OHW

Hydroriparian 

indicators 

1. Herbaceous marsh 

species

2. Pioneer tree seedlings

3. Sparse, low 

vegetation

4. Annual herbs, 

hydromesic ruderals

5. Perennial herbs, 

hydromesic clonals

1. Annual herbs, hydromesic 

ruderals 

2. Perennial herbs, 

hydromesic clonals

3. Pioneer tree seedlings

4. Pioneer tree saplings

1. Annual herbs, xeric 

ruderals 

2. Perennial herbs, non-clonal

3. Perennial herbs, clonal and 

non-clonal co-dominant 

4. Mature pioneer trees, no 

young trees

5. Mature pioneer trees 

w/upland species

6. Late-successional species

Mesoriparian 

indicators 

6. Pioneer tree seedlings

7. Sparse, low 

vegetation

8. Pioneer tree saplings

9. Xeroriparian species

5. Sparse, low vegetation 

Annual herbs, hydromesic

6. ruderals 

7. Perennial herbs, 

hydromesic clonals

8. Pioneer tree seedlings

9. Pioneer tree saplings

10. Xeroriparian species

11. Annual herbs, xeric 

ruderals 

7. Xeroriparian species

8. Annual herbs, xeric 

ruderals 

9. Perennial herbs, non-clonal

10. Perennial herbs, clonal and 

non-clonal codominent

11. Mature pioneer trees, no 

young trees

12. Mature pioneer trees, xeric 

understory 

13. Mature pioneer trees 

w/upland species

14. Late-successional species

15. Upland species

Xeroriparian 

indicators 

10. Sparse, low 

vegetation

11. Xeroriparian species

12. Annual herbs, xeric 

ruderals 

12. Sparse, low vegetation

13. Xeroriparian species

14. Annual herbs, xeric 

ruderals 

16. Annual herbs, xeric 

ruderals 

17. Mature pioneer trees 

w/upland species

18. Upland species

* Adapted from A Field Guide to the Identification of the Ordinary High Water Mark (OHWM) in the Arid West 

Region of the Western United States, A Delineation Manual (Lichvar and McColley 2008). 

2.4 Wetlands Delineation Criteria

The Corps’ 1987 Wetlands Delineation Manual identifies the key diagnostic criteria for 

determining the presence of wetlands. These include: 

1. Wetland Hydrology: Inundation or saturation to the surface during the 

growing season. 

2. Hydric Soils: Soils classified as hydric or that possess characteristics 

associated with reducing soil conditions. 

3. Predominance of Wetland Vegetation: Vegetation classified as facultative, 

facultative wet, or obligate according to its tolerance of saturated (i.e., 

anaerobic) soil conditions. 

Specific criteria used to determine the presence or absence of wetland hydrology, soil, 

and vegetation conditions are described in the sections below. 

F-I.2-13
2.4.1 Wetland Hydrology

The 1987 Corps Manual states that wetland hydrology conditions occur when a “site is 

inundated either permanently or periodically at mean water depths less than or equal to 

6.6 feet, or the soil is saturated to the surface at some time during the growing season of 

the prevalent vegetation.” Whether a site meets either of these criteria is determined by 

the presence of diagnostic indicators of wetland hydrology, which include those listed in 

Table 2.

Table 2. Wetland Hydrology Indicators

(Based on 1987 Corps Manual and Corps Guidance Documents)

Primary Indicators Secondary Indicators

Watermarks Oxidized Rhizospheres Associated with 

Living Roots

Drift Lines Water-Stained Leaves

Water-Borne Sediment Deposits FAC-Neutral Test

Drainage Patterns Within Wetlands Local Soil Survey Data

A March 8, 1992 Corps memorandum entitled Clarification and Interpretation of the 

1987 Manual provides further clarification: 

Areas which are seasonally inundated and/or saturated to the surface for a 

consecutive number of days for more than 12.5 percent of the growing 

season are wetlands, provided the soil and vegetation parameters are met. 

Areas wet between 5 percent and 12.5 percent of the growing season in 

most years may or may not be wetlands. Sites saturated to the surface for 

less than 5 percent of the growing season are non-wetlands.

Wetland hydrology indicators have also been further defined and described in the 

Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West 

Region (Version 2.0) (Corps 2008). These indicators are similar to the indicators listed 

above from the 1987 Corps Manual and are presented in Table 3. 

F-I.2-14
Table 3. Wetland Hydrology Indicators for the Arid West

(Based on Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West 

Region, Version 2.0)

Primary Indicators (any one indicator is 

sufficient to make a determination that 

wetland hydrology is present) 

Secondary Indicators (two or more 

indicators are required to make a 

determination that wetland hydrology is 

present) 

Group A – Observation of Surface Water or Saturated Soils

A1* – Surface Water X 

A2 – High Water Table X 

A3 – Saturation X 

Group B – Evidence of Recent Inundation

B1 – Water Marks X (Nonriverine) X (Riverine)

B2 – Sediment 

Deposits 

X (Nonriverine) X (Riverine)

B3 – Drift Deposits X (Nonriverine) X (Riverine)

B6 – Surface Soil 

Cracks X 

B7 – Inundation 

Visible on Aerial 

Imagery 

X 

B9 –Water-Stained 

Leaves X 

B10 – Drainage X 

B11 – Salt Crust X 

B12 – Biotic Crust X 

B13 – Aquatic 

Invertebrates X 

Group C – Evidence of Current or Recent Soil Saturation

C1 – Hydrogen Sulfide 

Odor X 

C2 – Dry-Season 

Water Table X 

C3 – Oxidized 

Rhizospheres 

along Living 

Roots 

X 

C4 – Presence of 

Reduced Iron X 

C6 – Recent Iron 

Reduction in 

Tilled Soils 

X 

C7 – Thin Muck 

Surface X 

C8 – Crayfish Burrows X 

F-I.2-15
Table 3. Wetland Hydrology Indicators for the Arid West

(Based on Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West 

Region, Version 2.0)

Primary Indicators (any one indicator is 

sufficient to make a determination that 

wetland hydrology is present) 

Secondary Indicators (two or more 

indicators are required to make a 

determination that wetland hydrology is 

present)

C9 – Saturation Visible 

on Aerial Imagery X 

Group D – Evidence from Other Site Conditions or Data

D3 – Shallow Aquitard X 

D5 – FAC-Neutral Test X 

* Denotes number of wetland hydrology indicator described in detail in the Regional Supplement to the 

Corps of Engineers Wetland Delineation Manual: Arid West Region (Version 2.0).

2.4.2 Hydric Soils

The 1987 Corps Manual states that the diagnostic environmental characteristics indicative

of wetland soil conditions are met when "soils are present and have been classified as 

hydric, or they possess characteristics that are associated with reducing soil conditions." 

According to the Manual, indicators of soils developed under reducing conditions may 

include: 

1. Organic soils (Histosols); 

2. Histic epipedons; 

3. Sulfidic material;

4. Aquic or peraquic moisture regime; 

5. Reducing soil conditions; 

6. Soil colors (chroma of 2 or less); 

7. Soil appearing on hydric soils list; and 

8. Iron and manganese concretions. 

A February 20, 1992, Corps memorandum entitled Regional Interpretation of the 1987 

Manual states that the most recent version of National Technical Committee for Hydric 

Soils (NTCHS) hydric soil criteria will be used (to make hydric soil determinations). 

These soil criteria specify at least 15 consecutive days of saturation or 7 days of 

inundation (flooding or ponding) during the growing season in most years. 

The concept of hydric soils includes soils developed under sufficiently wet conditions to 

support the growth and regeneration of hydrophytic vegetation. Soils that are sufficiently 

wet because of artificial measures are included in the concept of hydric soils. Also, soils 

in which the hydrology has been artificially modified are hydric if the soil, in an unaltered 

state, was hydric. Some series, designated as hydric, have phases that are not hydric 

depending on water table, flooding, and ponding characteristics. As indicated above, like 

the NRCS, the Corps has typically accepted guidance for the identification of hydric soils 

developed by the National Technical Committee for Hydric Soils (NTCHS). The 

F-I.2-16
NTCHS, a working group organized by NRCS, has developed criteria for identifying and 

mapping hydric soils throughout the United States and defines a hydric soil as “a soil that 

formed under conditions of saturation, flooding or ponding long enough during the 

growing season to develop anaerobic conditions in the upper part [of the soil profile]” 

(http://soils.usda.gov/use/hydric/intro.html). The most recent (2000) version of the 

NTCHS hydric soils criteria identifies those soils that are likely to meet this definition. 

These criteria, which are accepted by most state and federal agencies, are as follows 

(http://soils.usda.gov/use/hydric/criteria.html):

1. All Histels except Folistels and Histosols except Folists, or

2. Soils in Aquic suborders, great groups, or subgroups, Albolls suborder, 

Historthels great group, Histoturbels great group, Andic, Vitrandic, and Pachic 

subgroups, or Cumulic subgroups that are: 

a. Somewhat poorly drained with a water table equal to 0.0 foot (ft) 

from the surface during the growing season, or 

b. poorly drained or very poorly drained and have either: 

(i.) water table equal to 0.0 ft during the growing season if textures 

are coarse sand, sand, or fine sand in all layers within 20 inches 

(in), or for other soils, 

(ii.) water table at less than or equal to 0.5 ft from the surface 

during the growing season if permeability is equal to or greater 

than 6.0 in/hour (h) in all layers within 20 in, or 

(iii.) water table at less than or equal to 1.0 ft from the surface 

during the growing season if permeability is less than 6.0 in/h 

in any layer within 20 in, or 

3. Soils that are frequently ponded for a long duration or a very long duration (7 

to 30 days) during the growing season, or 

4. Soils that are frequently flooded for a long duration or a very long duration (7 

to 30 days) during the growing season. 

On the basis of computer database searches for soils meeting the second criterion, NRCS 

has developed hydric soils lists for many parts of the country. Although they are useful 

for determining whether a particular soil series has the potential to support current hydric 

soil conditions

Field indicators of hydric soils are morphological properties known to be associated with 

soils that meet the definition of a hydric soil. Presence of one or more field indicators 

suggests that processes associated with hydric soil formation have taken place on the site 

being observed. The field indicators are essential for hydric soil identification because 

, caution should be used when using these lists for site-specific hydric soil 

determinations. Many soils on the lists have ranges in water table depths and other 

characteristics that allow them to be either hydric or nonhydric depending on landscape 

position and other site-specific factors (e.g., soil clay content, depth to bedrock). 

Accordingly, hydric soils lists are good ancillary tools to facilitate wetland 

determinations, but are not a substitute for onsite investigations. 

F-I.2-17
once formed, they persist in the soil during both wet and dry seasonal periods. However, 

few hydric soil indicators identify soils at a site as being currently hydric in accordance 

with the NTCHS hydric soils criteria described above. Field indicators of hydric soil 

conditions are listed in Table 4: 

Table 4. Field Indicators of Hydric Soil Conditions

(Based on 1987 Corps Manual and Corps Guidance Documents)

1. Indicators of Historical Hydric Soil 

Conditions: 2. Indicators of Current Hydric Soil Conditions:

a. Histosols

b. Histic epipedons;

c. Soil colors (e.g., gleyed or low-chroma colors, 

soils with bright mottles (Redoximorphic 

features) and/or depleted soil matrix 

d. High organic content in surface of sandy soils

e. Organic streaking in sandy soils 

f. Iron and manganese concretions 

g. Soil listed on county hydric soils list

a. Aquic or peraquic moisture regime (inundation 

and/or soil saturation for ≥7 continuous days)

b. Reducing soil conditions (inundation and/or soil 

saturation for ≥ 7 continuous days)

c. Sulfidic material (rotten egg smell)

The presence of one or more of the field indicators in “1 a, b, c, and/or d” above suggests 

that historical processes associated with hydric soil development have taken place at a 

given site. These indicators are useful in determining if soils at a site were historically 

formed under hydric soil conditions because the indicators persist in soils during both wet 

and dry periods and may remain for decades and even centuries after changes in site 

conditions occur that inhibit subsequent wetland development, such as the elimination of 

wetland hydrology (NRCS 1995). However, only the presence of field indicators “2 a, b, 

and/or c” confirms that hydric soils occur at a site during the period of observation. 

Hydric soil indicators have also been further defined and described in the Regional 

Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region 

(Version 2.0) (Corps 2008). These indicators are similar to those listed above from the 

1987 Corps Manual and are presented below in Table 5. 

F-I.2-18
Table 5. Hydric Soil Indicators for the Arid West

(Based on Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region, 

Version 2.0)

Hydric Soil Indicators Hydric Soil Indicators 

All Soils Sandy Soils Loamy & Clayey Soils for Problem Soils**

A1* – Histosol S1 – Sandy Mucky 

Mineral

F1 – Loamy Mucky 

Mineral A9 – 1 cm Muck

A2 – Histic Epipedon S4 – Sandy Gleyed 

Matrix

F2 – Loamy Gleyed 

Matrix A10 – 2 cm Muck

A3 – Black Histic S5 – Sandy Redox F3 – Depleted Matrix F18 – Reduced Vertic

A4 – Hydrogen Sulfide S6 – Stripped Matrix F6 – Redox Dark Surface TF2 – Red Parent 

Material

A5 – Stratified Layers -- F7 – Depleted Dark 

Surface

Other (See Section 5 of 

the Regional Supplement, 

Version 2.0)--

A9 – 1 cm Muck -- F8 – Redox Depressions --

A11 – Depleted Below 

Dark Surface

-- F9 – Vernal Pools --

A12 – Thick Dark 

Surface

-- -- --

* Denotes number of hydric soil indicator described in detail in Regional Supplement to the Corps of 

Engineers Wetland Delineation Manual: Arid West Region (Version 2.0). 

** Indicators of hydrophytic vegetation and wetland hydrology must be present.

It should also be noted for problematic areas that the 2008 Corps Regional Supplement 

specifies 14 days continuous ponding as an acceptable indicator of problematic hydric 

soils (USACE 2008, p. 101). 

2.4.3 Prevalence of Wetland Vegetation

Species Classifications

Species classifications (e.g., tolerance of anaerobic soil conditions) are determined by 

consulting the National List of Plant Species that Occur in Wetlands (Reed 1988) and the 

relevant regional lists, which are published by FWS’ National Wetlands Inventory (NWI). 

Regional Interagency Review Panels develop the lists by determining species’ estimated 

probability of occurrence in wetlands vs. non-wetlands. Classifications are made by 

unanimous agreement of the Panel. If the Panel is unable to reach a unanimous decision 

on the status of a species, “no agreement” (NA) is recorded. If insufficient information 

exists to determine the status of a species, “no indicator” (NI) is recorded. Species that 

are not included in the NWI list are assigned a “not listed” (NL) designation in this report. 

The resulting NWI lists include plants that grow in a range of soil conditions from 

permanently wet to dry. Species are divided into the following “indicator categories:”

F-I.2-19
1. “Obligate wetland” (OBL) species, which, under natural conditions, occur almost 

always in wetlands (estimated probability >99 percent);

2. “Facultative wetland” (FACW) species, which usually occur in wetlands 

(estimated probability 67 – 99 percent), but are occasionally found in nonwetlands;

3. “Facultative” (FAC) species, which are equally likely to occur in wetlands or nonwetlands (estimated probability 34 – 66 percent); 

4. “Facultative upland” (FACU) species, which sometimes occur in wetlands 

(estimated probability 1 – 33 percent), but more often occur in non-wetlands; and

5. “Obligate upland” (UPL) species, which occur in wetlands in other regions, but, 

under natural conditions, occur almost always in non-wetlands in the region 

specified (estimated probability >99 percent).

Species that have an indicator status of OBL, FACW, and FAC are typically considered 

to be adapted for life in anaerobic soil conditions (Corps 1987) and are used as evidence 

of hydrophytic vegetation when they dominate plant community composition or cover. 

Despite widespread use of the lists for wetland delineations, it is important to note that 

wetland indicator species assignments are not based on the results of a statistical analysis 

of species occurrence. The indicator assignments are approximations of wetland affinity 

based on a synthesis of submitted review comments, published botanical literature, and 

the field experience of the members of the Interagency Review Panel. For this reason and 

because many plants have properties that enable them to occur in a range of microhabitats 

(i.e., wetlands and non-wetlands), the presence of wetland indicator species is not 

unequivocal evidence of the presence of wetland hydrology and hydric soils. A positive 

indicator or indicators of wetlands should be emphasized, such as an assemblage of plants 

that can only be considered “hydrophytes” when they are growing in water or partly 

drained hydric soils (not effectively drained hydric soils) (Corps 1987). From the FWS 

perspective, all species on the NWI plant lists are hydrophytes at one time or another and 

the wetland indicator status (OBL, FACW, FAC, or FACU) reflects the likelihood that a 

given individual of a species is a hydrophyte or a certain population of these plants is 

hydrophytic. While OBL and FACW species are the most reliable plant indicators of 

wetlands, FAC and FACU species also contain populations of hydrophytes (Tiner 2006). 

For the reasons stated above, the 1987 Corps Manual does not solely rely on the presence 

of hydrophytic vegetation to make wetland determinations. 

Hydrophytic Vegetation Definitions 

The Corps’ 1987 Manual states that the wetland vegetation conditions are met when the 

prevalent vegetation (i.e., more than 50 percent of vegetation cover or tree basal area) 

consists of macrophytes that are typically adapted to sites having wetland hydrologic and 

soil conditions (e.g., periodic or continuous inundation or soil saturation). Hydrophytic 

vegetation is defined as “plant life growing in water or on a substrate that is at least 

periodically deficient in oxygen as a result of excessive water content” (Cowardin et al. 

1979). Hydrophytic vegetative species, due to morphological, physiological, and/or 

reproductive adaptation(s), have the ability to grow, effectively compete, reproduce, 

and/or persist in anaerobic soil conditions. Positive indicators of the presence of 

F-I.2-20
hydrophytic vegetation include: 

1. More than 50 percent of the dominant species are rated as Obligate ("OBL"), 

Facultative Wet ("FACW"), or Facultative ("FAC") on lists of plant species 

that occur in wetlands (see Reed 1988 for California); 

2. Visual observations of plant species growing in sites of prolonged inundation 

or soil saturation; and 

3. Reports in the technical literature indicating the prevalent vegetation is 

commonly found in saturated soils. 

Hydrophytic vegetation indicators have been further defined and described in the 

Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West 

Region (Version 2.0) (Corps 2008). These indicators include: 

1. Dominance Test

2.

. More than 50 percent of the dominant plant species across 

all strata are rated OBL, FACW, or FAC. 

Prevalence Index

3.

. The prevalence index is 3.0 or less with indicators of 

hydric soils and wetland hydrology being present. 

Morphological Adaptations. The plant community passes either the 

dominance test or the prevalence index after reconsideration of the indicator 

status of certain plant species that exhibit morphological adaptations for life in 

wetlands. 

F-I.2-21
3.0 DELINEATION METHOD

This study was conducted in accordance with Code of Federal Regulations (CFR) 

definitions of jurisdictional waters, the Corps’ 1987 Wetlands Delineation Manual, the 

Corps’ 2008 Regional Supplement to the Corps of Engineers Wetland Delineation 

Manual: Arid West Region (Version 2.0), A Field Guide to the Identification of the

Ordinary High Water Mark (OHWM) in the Arid West Region of the Western United 

States, A Delineation Manual, and supporting guidance documents. The following 

provides an overview of the objective of the delineation approach, how the Study Area is 

defined, and the methods used to identify and map (delineate) areas potentially subject to 

Corps jurisdiction under Section 404 of the CWA. 

3.1 Objective and Establishment of Study Area Boundary

The objective of this investigation is to identify and map areas potentially meeting the 

Clean Water Act definition of wetlands and Other Waters of the United States within the 

potential impact footprint of the DesertXpress Project. This impact footprint, which is 

encompassed within the Study Area, includes the proposed alignment and any alternative 

alignment and support facilities such as passenger stations and operations and 

maintenance facilities (e.g., maintenance yard, power substations, and transmission lines). 

Temporary construction areas for equipment and materials laydown, new access roads, 

and borrow areas are also included within the Study Area. The boundary of the Study 

Area also represents a slightly larger area (increased alignment and facility ROW width 

by an average of 200 feet) to accommodate potential minor changes in the impact 

footprint. 

3.2 Study Area Reconnaissance

Prior to initiating detailed field survey work, existing land forms within the Study Area 

that may potentially contain wetlands or other waters of the United States were identified 

by conducting vehicle and pedestrian on-site reconnaissance inspections during the month 

of April 2010 in conjunction with review of the following information: 

• Aerial photography and satellite imagery of the area; 

• USGS topographic mapping; 

• NRCS soils mapping; 

• Engineer scale topographic mapping of segment alternatives

• USGS National Hydrology Dataset; and 

• Preliminary level vegetation mapping and wetland / OHWM data collection 

efforts conducted during February and March 2008 and September and October 

2009 as part of an on-going Federal EIS process by the FRA’s EIS contractor. 

The above efforts led to the development, in coordination with Corps regulatory staff, and 

use of the project-specific methods described below.

F-I.2-22
3.3 Wetlands Identification and Delineation

Field surveys designed to identify the presence or absence of field indicators of wetland 

vegetation, soils and hydrology conditions were conducted within low-lying landscape 

features where wetlands could potentially occur. These field surveys were conducted 

during the months of April, May, and June 2010. 

3.3.1 Dominance of Wetland Vegetation 

Presence or absence of a dominance of wetland vegetation / hydrophytes within the Study 

Area was evaluated using the methodology described in Sections 2.2 and 2.4.3. Indicator 

status of plants was confirmed by referring to the National List of Plant Species that 

Occur in Wetlands: 1988 National Summary (Reed). Plant cover data were collected for 

individual species associated within and immediately adjacent to the landscape features 

identified during the site reconnaissance survey as having the potential to meet the Corps’ 

technical criteria for wetlands. Plant cover was visually estimated within 3-foot diameter 

plots at each soil sample location described below and was recorded on a Corps Wetland 

Determination Data Form – Arid West Region. Copies of completed data forms are 

provided in Exhibit B2. Subsequently, field data were analyzed to assess whether 

50 percent or greater of the dominant species within the area sampled are hydrophytes. 

Sites that are depressional landforms that do not have a dominance of wetland vegetation 

forming at least 5 percent cover were not considered to be dominated by hydrophytes and 

were classified as a potential “other water of the United States” following the 

methodology described in Section 3.4, below, except if conditions for problematic 

vegetation were met as described in the Corps’ 2008 Regional Supplement to the Corps of 

Engineers Wetland Delineation Manual: Arid West Region (Version 2.0). 

3.3.2 Presence of Hydric Soil Indicators

The presence or absence of hydric soil field indicators was evaluated following the 

methodology described in Section 2.3.2 using the Regional Supplement to the Corps of 

Engineers Wetland Delineation Manual: Arid West Region (Corps 2008). At each 

potential wetland sampling location within the Study Area, hand-dug soil pits were 

excavated to a minimum of 20 inches or until a limiting layer or standing water was

reached. The presence or absence of hydric soil indicators found at each soil pit location 

was recorded on a Corps Wetland Determination Data Form – Arid West Region. Copies 

of completed data forms are provided in Exhibit B2. For sampling locations where the 

possibility of problematic hydric soils is found, procedures for the identification of 

problematic hydric soils as defined by the above described publication were followed. 

3.3.3 Presence of Wetland Hydrology Indicators 

The presence or absence of wetland hydrology field indicators were assessed following 

the methodology described in Section 2.3.1 using the Regional Supplement to the Corps 

of Engineers Wetland Delineation Manual: Arid West Region (Version 2.0) (Corps 

2008). The presence or absence of wetland hydrology indicators at each soil pit location 

was recorded on a Corps Wetland Determination Data Form – Arid West Region. Copies 

of completed data forms are provided in Exhibit B2. For sampling locations where the 

possibility of problematic hydrology indicators was found, procedures for the 

F-I.2-23
identification of problematic hydrology indicators, as defined by the above-described 

publication, were followed. 

3.4 Identification and Delineation of Other Waters

Field surveys designed to identify the presence or absence of field indicators of an 

ordinary high water mark (OHWM) were conducted within low-lying landscape features 

where other waters of the United States could potentially occur. These field surveys were 

conducted during the months of April, May, and June 2010 after the detailed 

methodology was reviewed and approved by Corps staff during May 2010. 

HBG identified drainages within each watershed that potentially met the Corps technical 

criteria for Other Waters of the United States (presence of field indicators of active 

surface water flow and associated Ordinary High Water Mark [OHWM]) using the 

following approach based on A Field Guide to the Identification of the Ordinary High 

Water Mark (OHWM) in the Arid West Region of the Western United States, A 

Delineation Manual. 

Initial efforts involved identification of all drainages within the Study Area having the 

potential for active surface flow. This was accomplished through field reconnaissance 

and imagery interpretation. Detailed sampling was then conducted to identify and 

delineated active drainages with an OHWM. This was accomplished by randomly 

sampling the identified drainages in a stratified manner by geographically dividing the 

Study Area into HUC 12 watershed units. 

Field sampling within each HUC 12 watershed consisted of gathering OHWM data, 

including the measured width of the OHWM, for 3 to 5 main drainages (> 3 feet), if 

present, selected at random; and 6 to 10 (depending on watershed size) random samples 

of minor drainages (≤ 3 feet), if present. Each of the HCC 12 watersheds located within 

the Study Area was divided into approximate thirds. Then a minimum of one major 

drainage and two minor drainages, if present, was sampled within each third of a 

watershed. Where the length of the watershed along the proposed alternatives was less 

than 5 miles, the watershed was divided into approximate halves instead. If the minor 

drainages (≤ 3 feet) occurring within each one-third watershed varied in OHWM width by 

more than 33 percent, sampling was increased in that third of the watershed. 

Drainage data for each of the watershed drainages sampled was collected on a 

standardized field data sheet (Exhibit B). Exhibit A, Figures 5-12 provide examples of 

the types of field indicators observed within various drainages located along the 

DesertXpress Project alternative alignments. Each field sampling point was 

memorialized using a handheld GPS unit with submeter accuracy. Where stormwater 

flows originated upslope of the side of I-15 opposite the alignment, those drainages were 

hydrologically cut off by the freeway during construction and channeled into detention 

basins and / or manmade drainages on that side of I-15. As a consequence, drainages on 

the proposed alignment side of I-15 were hydrologically cut off from their sources and no 

longer technically meet the Corps OHWM criterion. This condition was noted on the 

F-I.2-24
field data sheets. Detailed OHWM indicator data for these historical drainage features 

was not collected. 

All drainage data (field and photointerpreted drainage data) are summarized by HUC 12 

watershed on the required LA District Excel JD Summary Data Sheet (see Exhibit B1). 

Widths for active drainages identified through photointerpretation are based on an 

average width calculated from field data. The length of each drainage is based on 

photointerpretation. Standardized field data sheets are provided in Exhibit B2. 

Representative photographs of various drainage features are presented in Exhibit A on 

Figures 13 – 42. The field data collected from each watershed were used to aid in the 

imagery interpretation process described in Section 3.5, below. 

3.5 Mapping

Wetland indicator data sample locations and the locations of areas identified during field 

surveys that are potentially Other Waters of the United States due to the presence of an 

OHWM were mapped using a hand-held Trimble XT global positioning system (GPS) 

unit with sub-meter accuracy. This GPS data was incorporated into a Geographic 

Information System (GIS) and geo-referenced in overlay fashion onto digital 

orthorectified satellite imagery and/or high resolution aerial photograph depending on 

availability. Overlays were used to assist in analysis, identification, and digitization of 

the location and geographic extent of areas that could potentially qualify as waters of the 

United States. The imagery interpretation process involved the combined use of available 

imagery, field data, engineer level topographic mapping, field verification of mapped 

features and best professional judgment to map the geographic extent of areas potentially 

subject to Corps CWA jurisdiction. Exhibit C presents representative detailed mapping 

within the Study Area with field sampling points and delineated active linear drainage 

features with labeling indicating their average OHWM width overlaid onto orthorectified 

digital imagery. Based on guidance received from Corps staff, only representative 

ephemeral drainages were mapped within a watershed that drains to an isolated dry lake 

with no surface water drainage outlet. Resulting mapping depicts representative 

ephemeral drainages within the Study Area and the surface water flow path from the 

Study Area to the isolated dry lake. 

 

F-I.2-25
4.0 TECHNICAL FINDINGS

The following sections describe the landscape features and field indicators found within 

the Study Area that provide a technical basis for (a) determining the presence or absence 

of a potential water of the United States; and (b) defining the geographic extent of any 

potential water of the United States identified. Two types of landscape features were 

found that potentially contain waters of the United States. These include:

1. Natural drainages

2. Manmade drainages

4.1 Field Indicators of Hydric Soils

Based on field observations within the Study Area, soil indicators were not found that 

meet the hydric soils criteria defined by current Corps’ regulatory guidance, including the 

2008 Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid 

West Region (Version 2.0). Onsite observations of surface conditions, including road and 

channel bank cuts, and interpretation of aerial photography revealed two primary soil 

types, desert pavement and more active wash sediments. Onsite examination revealed 

that soils or substrates within both natural drainages and manmade drainages consist of 

alluvial materials primarily made up of sorted sands and gravel, and are well drained, 

ranging from moderately well drained to excessively well drained.

4.2 Field Indicators of Wetland Hydrology Conditions

Based on field observations within the Study Area, wetland hydrology indicators were not

found that meet the wetlands hydrology criteria defined by current Corps’ regulatory 

guidance, including the 2008 Regional Supplement to the Corps of Engineers Wetland 

Delineation Manual: Arid West Region (Version 2.0). Onsite observations revealed 

evidence of flooding within the low-lying natural and manmade drainages. These 

observations also showed that there was no evidence of ponding and soil saturation for 

long to very long periods of time. The lack of ponding and soil saturation conditions 

meeting the wetland hydrology criteria is a direct result of the moderately well drained to 

excessively well drained alluvial soils. 

Although wetland hydrology conditions were not found within the Study Area, the field 

indicators of active surface water flow or flooding found within natural and manmade

drainages were sufficient enough to form Ordinary High Water Marks (OHWM). As 

indicated in Section 2.0, an OHWM provides a technical basis for (a) determining the 

presence a potential water of the United States; and (b) defining the geographic extent of 

potential water of the United States. 

The natural and manmade drainages within the Study Area found with an OHWM 

exhibited the following characteristics which are discussed in detail in the following 

subsections: 

F-I.2-26
1. identifiable field indicators of surface flow 

2. identifiable landscape features that supports surface flow 

3. identifiable landscape features with a recognizable OHWM 

Exhibit A, Figures 5-12 provides typical examples of field indicators of active surface 

water flow and OHWMs found within ephemeral drainages occurring within the 

DesertXpress Project Study Area. Exhibit A, Figures 13-42 provide photographs of 

various types of drainages observed within the HUC 8 Ivanpah - Pahrump Valleys 

watershed.

4.2.1 Field Indicators of Surface Flow

Review of topographic mapping (USGS and Engineer scale) and imagery of the Study 

Area provided visual indication of the presence of curvilinear depressional land surface 

features where focused surface water flow could potentially be directed. Linear drainage 

features associated with road drainage and flood control were also found. Field 

investigations confirmed the presence of surface flow within a number of these channels 

or drainages while others lacked evidence / field indicators of active ephemeral surface 

water flow. No drainages were found to contain evidence of perennial or intermittent 

surface water flow, and no evidence of subsurface flow was found in the form of spring 

discharges, artesian flows or indicia of a high groundwater table. Observation of active 

natural and manmade ephemeral drainages revealed evidence of surface water / 

hydrologic connectivity with other active drainages within and outside the Study Area. 

These ephemeral drainages are locally referred to as “desert dry washes.” The manmade 

drainages served to redirect surface flow from altered natural drainages. Indicators of 

drainages having active surface water flow paths included (1) water marks defined by 

linear deposits of fine grained sediment, minerals, and/or plant debris; (2) bank scour, 

erosion, and/or shelving; (3) deposits of sorted alluvial materials; and (4) flow-deposited 

woody and soft tissue plant debris (Exhibit B). 

Flow-deposited woody and soft tissue plant debris were typically absent in drainages that 

did not have active surface flow. If woody debris was present, the pieces observed were 

relatively thick (i.e., greater that 1⁄4 inch) weathered limb or root material or milled posts 

or lumber. The wood pieces found were randomly placed and were not part of a 

collective flow line of deposited woody and/or soft tissue plant debris, which would be 

indicative of an active channel. The historical drainages were found to possess one or 

more of the same type of indicators found in active drainages, but the indicators found 

were considerably weathered. Surface flow indicators such as bank scour, erosion and 

shelving areas had rounded edges in contrast to those found in active drainages having 

angular edges. Water marks defined by linear deposits of fine grained sediment and 

minerals, and sorted alluvial materials such as gravels, cobbles and boulders were etched 

or varnished from weathering. The historical drainages were found to consist of the 

historical remains of channel drainages that were abandoned due to upslope changes in 

drainage due to either channel down-cutting or the channel becoming abandoned as the 

surface drainage became redirected or changed course due to deposition of alluvial 

material damming the channel flow path. The historical drainages were found to lack 

F-I.2-27
indicators of active flow. 

Surface water flow patterns were also found within various portions of the landscape that 

were relatively flat. These surface flow areas were defined by flow-deposited fine 

grained sediment or soft tissue plant debris. The visible surface flow pattern at these 

locations would continue for several feet then disappear either on a relatively flat soil 

surface or localized depression.

Based on the above technical findings and as documented in Exhibits B and C, drainages 

were found with indicators of active surface water flows within the Study Area. 

4.2.2 Landscape Features that Support Surface Flow

Detailed field surveys identified land surface features that have the potential to convey 

surface flows. These features included a bed or channel and abutting banks. These 

physical features were found associated with both active flow areas and historical 

drainages. These drainage types can be summarized as follows:

1. Active drainage channel and abutting banks containing evidence of recent surface 

flows as indicated by the presence of unweathered sediment material (sand, 

gravel, cobbles, etc.) with unweathered surfaces, and the presence of flow 

deposited woody debris and/or soft tissue plant debris. 

2. Active drainage channel and abutting banks containing evidence of historical 

surface flows as indicated by the presence of unweathered sediment material 

(sand, gravel, cobbles, etc.) with unweathered surfaces, but lacked the presence of 

flow deposited woody debris and/or soft tissue plant debris. 

3. Historical drainage channels and abutting banks having no evidence of recent 

surface flow as indicated by weathered sedimentary gravel, cobbles, boulders, 

erosional or depositional deposits, and the lack of flow deposited woody debris 

and/ or soft tissue plant debris. 

The frequency interval of flow events within drainages with observable plant debris (1 

above) and unweathered sediment material is estimated to be within the 1 to 15 year 

range. Strojan, et al. (1987) found that surface litter decomposition rates for creosote 

bush and burro bush in the Mojave Desert were 42.5% and 58.4%, respectively over a 54-

week period of study. Kemp, et al. (2003) reported a similar one year decomposition rate 

for creosote bush and a 74% loss within a 41-month period. This lends support to 

qualitative observations made by one of the preparers of this report, Dr. Terry Huffman, 

who has observed over 20 + years of delineating wetlands within arid environments that 

soft plant tissue (i.e., pieces of plant leaves and thin bark) will decompose in arid 

drainage environments within a 2 to 3 year period. In addition, field observations over 

these years indicated that small woody stems (<1/4 inch) decompose over many more 

years, perhaps 10 + years. For older drainages where the surfaces of the sediment 

material (e.g., sand, gravel, cobbles, etc.) is no longer smoothed by the interaction of 

surface water flow and transport, but weathered, and lacks flow deposited woody and thin 

tissue plant debris, the frequency interval likely ranges to well over a decade in shallower 

F-I.2-28
channels to prehistoric times for deeply incised channels (i.e. > 6 feet in desert pavement 

areas). 

The land surface of the Study Area is characterized by the presence of active and inactive

alluvial fan systems. Ephemeral drainage channels are found on both types of these 

alluvial fan types. The majority of the ephemeral channels supporting active surface 

water flow were narrow, with an average width of less than 3 feet. Active alluvial fans 

were characterized by sandy soils, a uniform vegetation type, and evidence by surface 

flow patterns indicative of surface water sheetflow. Narrow channels within these areas 

were both weakly expressed and discontinuous. This discontinuity indicated that new 

channels could be formed with each major flood event resulting in the current channels 

being bypassed and blocked off. Channels >3 feet wide were also found. These channels 

were considerably deeper that the narrow channels found and were less common when 

considering the landscape as a whole in relationship to the Study Area. Evidence was 

found within both of these channel types where previously bypassed cutoff channels 

where becoming filled with sediment. The specific conditions varied within the Study 

Area. 

Based on the above technical findings, drainages with active surface flow were found 

within the Study Area with physical features that allow for the conveyance of surface 

flows. 

4.2.3 Landscape Features with a Recognizable OHWM

The desert dry washes with active flow were found to have identifiable features which 

represented the geographic reach of lateral surface water. These features included 

channels or beds with evidence of active flow and abutting banks which demarcated the 

lateral reach or extent of flow. Field indicators of the extent of active flow along the 

banks included water marks defined by linear deposits of fine grained sediment and/or 

minerals, bank scour, erosion, and/or shelving, and flow deposited woody and soft tissue 

plant debris (Exhibit B). 

Based on the above technical findings, the active drainages, described in the above 

subsections, have recognizable landscape features from which the lateral extent of surface 

water flow can be geographically delineated. Field indicators of this surface water flow 

were used to identify the OHWM. Exhibit C shows representative active ephemeral 

drainages, as described in Section 3.5, Mapping. 

4.3 Field Indicators of Wetland Vegetation

On the basis of field observations within the Study Area, a dominance of wetland plant 

species or hydrophytes was not found. Based on this result, the criteria defined by current 

Corps’ regulatory guidance, including the 2008 Regional Supplement to the Corps of 

Engineers Wetland Delineation Manual: Arid West Region (Version 2.0) for wetland 

vegetation were not met.

F-I.2-29
4.4. Presence of Wetland Vegetation within Natural and Manmade 

Drainages

On the basis of field observations within the Study Area, a dominance of wetland plant 

species or hydrophytes was not found within natural or manmade drainages within the 

Study Area where active ephemeral drainages were found. 

F-I.2-30
5.0 AREAS POTENTIALLY SUBJECT TO JURISDICTION 

This section presents the findings of this delineation with respect to the identification and 

geographic extent of areas found that could potentially be regulated by the Corps and the 

EPA as wetlands or other waters of the United States under Section 404 of the Clean 

Water Act. 

5.1 Wetlands 

No areas meeting the Corps technical criteria for wetlands were identified within the 

Study Area. These findings are based on the absence of hydric soil, wetland hydrology, 

and / or wetland vegetation indicators as required by the Corps’ 1987 Manual, the Arid 

West Regional Supplement, guidance documents, and regulations. 

5.2 Other Waters of the U.S.

Ephemeral drainages or desert dry washes were found within the Study Area that meet the 

technical criteria to potentially be subject to CWA Section 404 jurisdiction as Other 

Waters of the United States (Exhibit C). This finding is based on the presence of an 

OHWM as required by Corps regulations. Length and width measurements of the 

ephemeral drainages found to contain an observable OHWM are provided by Exhibit B. 

F-I.2-31
6.0 CWA JURISDICTIONAL ANALYSIS

This section analyzes the potential for waters identified within the Study Area to 

constitute waters of the United States subject to jurisdiction under the CWA. Section 6.1 

provides an explanation of the jurisdictional determination process following EPA and 

Corps guidance. Section 6.2 defines the area to be analyzed (i.e., the Review Area). 

Section 6.3 analyzes the potential for waters of the United States to be present in the 

Review Area. Section 6.4 describes any jurisdictional and /or non-jurisdictional waters 

found. Section 6.5 summarizes the findings of this jurisdictional analysis. Section 6.6 is 

a disclaimer statement.

6.1 Regulatory Background

Beyond the Corps and EPA regulatory definitions of “waters of the United States” as 

described in Section 2.0, recent judicial decisions have further limited and refined the 

scope of CWA jurisdiction with regard to isolated waters and certain wetlands and nonnavigable tributaries. Two of these decisions are relevant to this jurisdictional analysis.

First, in Solid Waste Agency of Northern Cook County v. United States Army Corps of 

Engineers, No. 99-1178 (531 U. S. 159; [2001]) (SWANCC), both statutory and 

constitutional challenges were made to the assertion of CWA jurisdiction over isolated, 

non-navigable, intrastate waters solely on the basis that those waters were used as habitat 

by migratory birds. The U.S. Supreme Court in SWANCC rejected the “migratory bird 

rule,” and held that CWA jurisdiction does not exist over “isolated, non-navigable, 

intrastate waters” where there is no nexus to interstate or foreign commerce. 

Second, the U.S. Supreme Court’s plurality opinion in Rapanos v. United States, 547 

U.S. 715 (2006) (Rapanos), addressed jurisdiction over waters of the United States under 

Section 404 of the CWA. The concurring opinion by Justice Kennedy held in pertinent 

part that waters with a "significant nexus" to "navigable waters" are covered under the 

CWA. In response to Rapanos, on December 2, 2008, USEPA and the Corps issued 

guidance to EPA regions and Corps districts (the “Rapanos Guidance”) to address the 

jurisdictional scope of the CWA over certain types of waters (i.e., traditional navigable 

waters, wetlands adjacent to traditional navigable waters, non-navigable tributaries that 

are relatively permanent, and wetlands that directly abut tributaries). The Rapanos 

Guidance identifies which waters the agencies will categorically assert jurisdiction over 

and which will be subject to a case-by-case analysis based on the reasoning of the 

Rapanos opinions to identify whether the water has a “significant nexus” to a “traditional 

navigable water” (TNW). The Rapanos Guidance focuses only on those definitions of 

“waters of the United States” in 33 C.F.R. § 328.3(a)(1), (a)(5) and (a)(7).2

2 The Rapanos Guidance covers the following 33 C.F.R. § 328.3(a) definition of "waters of the United States":

Neither the 

Supreme Court nor the Rapanos Guidance draws a bright line with regard to the 

(a)(1) All waters which are currently used, or were used in the past, or may be susceptible to use in interstate or foreign 

commerce, including all waters which are subject to the ebb and flow of the tide; 

(a)(5) Tributaries of waters identified in paragraphs (a)(1)-(4) of this section; 

(a)(7) Wetlands adjacent to waters (other than waters that are themselves wetlands) identified in paragraphs (a)(1)-(6) 

of this section. 

F-I.2-32
geographic reach of jurisdiction, particularly in drainages where flows are ephemeral and 

where wetlands are adjacent to, but not directly abutting relatively permanent waters. The 

Rapanos Guidance provides in pertinent part the following: 

 The agencies will assert jurisdiction over non-navigable, not relatively 

permanent tributaries and their adjacent wetlands where such tributaries 

and wetlands have a significant nexus to a traditional navigable water. 

 A significant nexus analysis will assess the flow characteristics and 

functions of the tributary itself and the functions performed by any 

wetlands adjacent to the tributary to determine if they significantly affect 

the chemical, physical and biological integrity of downstream traditional 

navigable waters. 

 “Similarly situated” wetlands include all wetlands adjacent to the same 

tributary.

 Significant nexus includes consideration of hydrologic factors including 

the following: volume, duration, and frequency of flow, including 

consideration of certain physical characteristics of the tributary; 

proximity to the traditional navigable water; size of the watershed; 

average annual rainfall; average annual winter snow pack. 

 Significant nexus also includes consideration of ecologic factors 

including the following : potential of tributaries to carry pollutants and 

flood waters to traditional navigable waters; provision of aquatic habitat 

that supports a traditional navigable water; potential of wetlands to trap 

and filter pollutants or store flood waters; maintenance of water quality 

in traditional navigable waters. 

 The following geographic features generally are not jurisdictional 

waters: swales or erosional features (e.g. gullies, small washes 

characterized by low volume, infrequent, or short duration flow).... 

[Rapanos Guidance, at p. 8 (emphasis added)] 

According to the Rapanos Guidance, a significant nexus analysis “. . . will assess the flow 

characteristics and functions of the tributary itself, together with the functions performed 

by any wetlands adjacent to that tributary,” to determine if they significantly affect the 

chemical, physical and biological integrity of downstream traditional navigable waters.

(Rapanos Guidance, p. 8.) The analysis will consider both hydrologic and ecologic 

factors. Hydrologic factors include volume, duration, and frequency of flow, proximity to 

the TNW, size of the watershed, and average annual rainfall. Ecologic factors include the 

potential for tributaries to carry pollutants and flood waters to TNWs or to provide 

aquatic habitat to support a TNW, and the potential for wetlands to trap and filter 

pollutants or store flood waters. The Guidance states (on p.10), “[w]here it is determined 

F-I.2-33
that a tributary and its adjacent wetlands collectively have a significant nexus with 

traditional navigable waters, the tributary and all of its adjacent wetlands are 

jurisdictional.” 

6.2 Review Area

For the purpose of this analysis, the Study Area used for the delineation process is also to 

be considered the Review Area. A Review Area as defined by the Rapanos Guidance is 

the area of interest for the verification of the location and extent of waters of the United 

States. Exhibit D presents a series of maps that show the Review Area relative to 

Ivanpah Dry Lake. Exhibits D1 and D2 show USGS National Hydrography Dataset 

(NHD) flowlines and arrows that indicate the direction and route of surface water flow 

from the Review Area toward Ivanpah Dry Lake; the NHD data are superposed 

respectively on an aerial photo and on a USGS topographic map. Exhibit D3 shows the 

extent of the Review Area (also referred to as the Study Area). 

6.3 CWA Analysis 

Section 5.0 of this report discusses a number of active ephemeral drainages (locally 

known as desert dry washes) identified and delineated within the Study Area / Review 

Area that meet the technical criteria of “other waters” potentially subject to CWA 

jurisdiction. Maps showing the geographic extent of these drainages within the Review 

Area are presented in Exhibit D (Exhibits D1 – D3). 

The following discussion follows the Corps Approved Jurisdictional Determination Form 

developed following the Rapanos decision. 

6.3.1 Are Jurisdictional Waters Present within the Study Area 

(Rapanos Guidance)? 

Table 6 provides a summary of the Rapanos Guidance process for determining 

jurisdiction over waters of the United States under Section 404 of the CWA. 

Table 6. Summary of Process for Determining Jurisdiction Over Waters of the U.S. Under Section 

404 of the Clean Water Act Following EPA and Corps Rapanos Guidance*

“Approved JD Form” Categories of 

Potential Waters of the U.S.**

Will Corps 

Categorically 

Assert

Jurisdiction? 

Corps Will Assert Jurisdiction Based on a FactSpecific Analysis to Determine Whether Waters 

Identified Have a Significant Nexus With a TNW

Analysis Based 

on Significant 

Nexus Testing

Comments

1. Traditional navigable waters 

(TNWs), including territorial seas, 

and adjacent wetlands 

Yes Not Applicable 

(NA) NA

2. Wetlands adjacent to TNWs Yes NA NA

F-I.2-34
Table 6. Summary of Process for Determining Jurisdiction Over Waters of the U.S. Under Section 

404 of the Clean Water Act Following EPA and Corps Rapanos Guidance*

“Approved JD Form” Categories of 

Potential Waters of the U.S.**

Will Corps 

Categorically 

Assert

Jurisdiction? 

Corps Will Assert Jurisdiction Based on a FactSpecific Analysis to Determine Whether Waters 

Identified Have a Significant Nexus With a TNW

Analysis Based 

on Significant 

Nexus Testing

Comments

3. Relatively permanent waters 

(RPWs)3 that flow directly or Yes

indirectly into TNWs

NA NA

4. Non-RPWs that flow directly or 

indirectly into TNWs No Yes

Jurisdictional if the drainage flows 

directly or indirectly into a TNW and 

has a significant nexus with the TNW

5. Wetlands directly abutting RPWs 

that flow directly or indirectly into 

TNWs

Yes NA NA

6. Wetlands adjacent to but not 

directly abutting RPWs that flow 

directly or indirectly into TNWs

No Yes

Jurisdictional when considered in 

combination with the tributary to 

which they are adjacent and, with 

similarly situated adjacent wetlands, 

have a significant nexus with a TNW

7. Wetlands adjacent to non-RPWs 

that flow directly or indirectly into 

TNWs

No Yes

Jurisdictional when considered in 

combination with the tributary to 

which they are adjacent and, with 

similarly situated adjacent wetlands, 

have a significant nexus with a TNW

8. Impoundments of jurisdictional 

waters

Generally, 

impoundment of a 

water of the U.S. 

does not affect its 

jurisdictional 

status.

NA

Yes, if:

 Impoundment created from WOUS

 Water meets one of the above 

waters categories

 Water is isolated with a significant 

nexus to interstate or foreign 

commerce (to be elevated to Corps 

Headquarters for review consistent 

with Rapanos Guidance)

9. Isolated (interstate or intrastate) 

waters including isolated wetlands 

the use, degradation or destruction 

of which could affect interstate 

commerce

No

To be elevated to Corps Headquarters 

for review consistent with Rapanos 

Guidance

* U.S. Army Corps of Engineers. 2007. U.S. Army Corps of Engineers Jurisdictional Determination Form 

Instructional Guidebook. May 30.

** U.S. Army Corps of Engineers. 2007. Appendix B, Approved JD Form, Section II, in U.S. Army Corps of 

Engineers Jurisdictional Determination Form Instructional Guidebook. May 30.

As described in the technical findings of this report (Section 4.0), the active ephemeral 

drainages identified in the Review Area are not permanent or even seasonal, but rather 

flow or flood for few hours during heavy precipitation events. The climate data in 

Section 1.0 indicates that the Review Area receives an annual average rainfall amount of 

4 inches. Thus, these ephemeral drainages are non-Relatively Permanent Waters (non3

 Under the Corps / EPA Rapanos Guidance, a Relatively Permanent Water (RPW) is defined as a tributary that is not 

a TNW and that typically flows year-round or has continuous flow at least “seasonally” (e.g., typically 3 months).

F-I.2-35
RPWs). (A Relatively Permanent Water is defined in the Rapanos Guidance as a 

tributary that is not a TNW and that typically flows year-round or has continuous flow at 

least “seasonally” (e.g., typically 3 months). Representative drainages that flow to 

Ivanpah Dry Lake are shown on Exhibit D3. These drainages (non-RPWs) are also listed 

in the Exhibit B field data table. In addition, no areas were found within the Review Area 

that meet the Corps criteria for wetlands in the 1987 Corps of Engineers Wetlands 

Delineation Manual and/or the 2008 Arid West Supplement. 

Using the Rapanos Guidance analysis as summarized by Table 6, the non-RPWs were 

determined not to fall within any of the categories of potential waters of the U.S., as 

shown below in Table 7. 

Table 7. Summary of EPA and Corps Rapanos Analysis

“Approved JD Form” Categories of 

Potential Waters of the U.S.*

Wetlands 

Present? 

(acres)

Other Waters of 

the U.S 

Present? (acres)

Rationale For Determination if Waters 

in Review Area are Subject to Corps 

Jurisdiction under CWA Section 404

1. Traditional navigable waters 

(TNWs), including territorial seas No No Criteria for type of water not met; waters are non-RPWs. 

2. Wetlands adjacent to TNWs No No Criteria for type of water not met; no 

wetlands present within Review Area.

3. Relatively permanent waters 

(RPWs) that flow directly or 

indirectly into TNWs

No No

Criteria for type of water not met; waters 

are non-RPWs, but do not flow directly 

or indirectly into TNWs.

4. Non-RPWs that flow directly or 

indirectly into TNWs No No

Criteria for type of water not met; waters 

are non-RPWs that do not flow directly 

or indirectly into a TNW.

5. Wetlands directly abutting RPWs 

that flow directly or indirectly into 

TNWs

No No Criteria for type of water not met; no 

wetlands present within Review Area. 

6. Wetlands adjacent to but not 

directly abutting RPWs that flow 

directly or indirectly into TNWs

No No Criteria for type of water not met; no 

wetlands present within Review Area.

7. Wetlands adjacent to non-RPWs 

that flow directly or indirectly into 

TNWs

No No Criteria for type of water not met; no 

wetlands present within Review Area.

8. Impoundments of jurisdictional 

waters No No Criteria for type of water not met; waters are non-RPWs.

9. Isolated (interstate or intrastate) 

waters including isolated wetlands 

the use, degradation or destruction 

of which could affect interstate 

commerce

No No

Criteria for type of water not met. See 

Table 8 for interstate commerce analysis 

for the Review Area, the drainages 

connecting the Review Area to Ivanpah 

Dry Lake, and Ivanpah Dry Lake.

* U.S. Army Corps of Engineers. 2007. Appendix B, Approved JD Form, Section II, in U.S. Army Corps of Engineers 

Jurisdictional Determination Form Instructional Guidebook. May 30.

6.3.2 Are There Isolated Waters within the Study Area? 

When the non-RPWs identified within the Review Area flow, they flow toward the 

northern boundary of Ivanpah Dry Lake, which is an ephemeral dry lake with no outlet 

(Exhibit D). No substantial nexus to interstate or foreign commerce was found associated 

with the non-RPWs within the Review Area. This finding is based on the following factF-I.2-36
specific analysis provided by Table 8, below regarding whether the use, degradation, or 

destruction of the intrastate non-RPWs within the Review Area would affect interstate 

commerce. In addition, a fact specific analysis was conducted for Ivanpah Dry Lake. On 

the basis of HBG’s analysis, Ivanpah Dry Lake was found to be: (1) a non-Traditional 

Navigable Water, (2) an interstate water located within the states of California and

Nevada, (3) an isolated basin with no hydrologic surface water outlet and (4) although the 

dry lake bed of this ephemeral water is known to be used for land sailing (aka: sand 

yachting or land yachting) and meteorite hunting, no surface water connection to 

interstate or foreign commerce was found (Table 8). 

F-I.2-37
Table 8. Interstate/Foreign Commerce Analysis

Factors Used to Determine 

Substantial Nexus to 

Interstate or Foreign 

Commerce

Could the Use, Degradation or 

Destruction of the Intrastate 

non-RPWs within the Review 

Area, Drainages Connecting 

the Review Area to Ivanpah 

Dry Lake, or Ivanpah Dry 

Lake Affect Interstate or 

Foreign Commerce?

Fact-Specific Analysis

Review Area Drainages Connecting the Review Area 

to Ivanpah Dry Lake Ivanpah Dry Lake

Waters which are or could 

be used by interstate or 

foreign travelers for 

recreational purposes.

No

Given the ephemeral as well as 

unpredictable nature of surface flows, 

no recreational use occurs that is 

surface water dependent. This was 

confirmed by site inspection, review of 

remote sensing imagery, and internet 

search.

Given the ephemeral as well as 

unpredictable nature of surface flows, no 

recreational use occurs that is surface 

water dependent. This was confirmed by 

site inspection, review of remote sensing 

imagery, and internet search.

Given the ephemeral as well as 

unpredictable nature of surface ponding, 

no recreational uses occur that are surface 

water dependent. This was confirmed by 

site inspection, review of remote sensing 

imagery, and internet search.

Waters from which fish or 

shellfish are or could be 

taken and sold in interstate 

or foreign commerce.

No

Given the ephemeral as well as 

unpredictable nature of surface flows, 

no fish or shellfish habitat is associated 

with the ephemeral drainages. This 

was confirmed by site inspection, 

review of remote sensing imagery, and 

internet search.

Given the ephemeral as well as 

unpredictable nature of surface flows, no 

fish or shellfish habitat is associated with 

the ephemeral drainages. This was 

confirmed by site inspection, review of 

remote sensing imagery and internet 

search.

Given the ephemeral as well as 

unpredictable nature of surface ponding, 

no fish or shellfish habitat is associated 

with this playa lake. This was confirmed 

by site inspection, review of remote 

sensing imagery, and internet search.

Waters which are or could 

be used for industrial 

purposes by industries in 

interstate commerce.

No

Given the ephemeral as well as 

unpredictable nature of surface flows, 

the non-RPWs are not used and could 

not be used for surface-waterdependent industrial purposes, 

including, but not limited, to mineral 

extraction, power generation, and 

agricultural irrigation. This was 

confirmed by site inspection, review of 

remote sensing imagery, and internet 

search.

Given the ephemeral as well as 

unpredictable nature of surface flows, the 

non-RPWs are not used and could not be 

used for surface-water-dependent 

industrial purposes, including, but not 

limited, to mineral extraction, power 

generation, and agricultural irrigation. 

This was confirmed by site inspection, 

review of remote sensing imagery, and 

internet search.

Given the ephemeral as well as 

unpredictable nature of surface ponding, 

the waters are not used and could not be 

used for surface-water-dependent 

industrial purposes, including but not 

limited to mineral extraction, power 

generation, and agricultural irrigation. 

This was confirmed by site inspection, 

review of remote sensing imagery, and 

internet search.

Waters which are interstate 

isolated waters. Not Applicable

Waters are intrastate non-RPWs found 

within the State of California with no 

nexus to interstate or foreign 

commerce, as demonstrated by the 

above analysis.

Waters are intrastate non-RPWs found 

within the State of California with no 

nexus to interstate or foreign commerce, 

as demonstrated by the above analysis.

Ivanpah Dry Lake is an interstate water 

found in both California and Nevada with 

no nexus to interstate or foreign 

commerce, as demonstrated by the above 

analysis. This isolated basin has no outlet 

(Exhibits D1 and D2).

Other factors Not Applicable No other factors known to occur. No other factors known to occur. No other factors known to occur.

F-I.2-38
6.4 Are Non-Jurisdictional Waters Present within the Study Area?

On the basis of the above analysis and findings, no areas were found within the Review 

Area, drainages connecting the Review Area to Ivanpah Dry Lake, or Ivanpah Dry Lake 

that meet the Corps criteria for wetlands defined in the 1987 Corps of Engineers Wetlands 

Delineation Manual and/or the 2008 Arid West Supplement. The above analysis also 

found that the Review Area and drainages connecting the Review Area to Ivanpah Dry 

Lake contain non-RPWs that are isolated, non-navigable, and wholly intrastate waters 

with no substantial nexus to interstate or foreign commence. Furthermore, Ivanpah Dry 

Lake itself is an isolated, non-navigable interstate water with no substantial nexus to 

interstate or foreign commence. As required, as part of the determination process under 

the Rapanos Guidance, it should be noted that: 

1. Prior to the January 2001 Supreme Court decision in SWANCC, some portion of 

the non-RPWs in the Review Area would likely have been subject to CWA 

jurisdiction based on the then-existing Migratory Bird Rule (51 F.R. 41217), 

given the likely presence of migratory waterbirds during ephemeral ponding and 

the presence of a federal listed endangered species, the desert tortoise (Gopherus 

agassizii),4

2. The waters are isolated with no significant nexus to interstate or foreign 

commerce and therefore no significant nexus standard analysis for connectivity to 

a TNW is required by the Rapanos Guidance, as non-RPWs are not in a category 

of water requiring such analysis. 

within the Review Area. 

6.5 Jurisdictional Analysis Summary

On the basis of the above analysis and as seen in the maps in Exhibit D and summarized 

in Table 9, the active ephemeral drainages (non-RPWs or desert dry washes) found within 

the (1) Review Area, (2) drainages connecting the Review Area to to Ivanpah Dry Lake, 

and (3) Ivanpah Dry Lake would be considered non-jurisdictional under the CWA. The 

non-RPWs within the Review Area are not jurisdictional waters of the United States 

based on the fact that:

1. No wetlands were found with the Review Area as there were no areas that met the 

criteria in the 1987 Corps of Engineers Wetlands Delineation Manual and/or the 

2008 Arid West Supplement. 

2. The non-jurisdictional non-RPWs found are isolated waters with no substantial 

connection to interstate or foreign commerce. 

4

 Under the Migratory Bird Rule (51 F.R. 41217) the presence of or the potential for use by migratory 

birds and/ or Federally-listed species satisfies the determination requirements.

F-I.2-39
Table 9. Jurisdictional Analysis Summary

“Approved JD Form” 

Categories of Potential Waters 

of the U.S.*

Was 

Category of 

Waters 

Identified in 

Study 

Area?

Nexus to 

Interstate 

or Foreign 

Commerce?

Jurisdictional 

Water 

Found?

Non-Jurisdictional 

Water Found?

1. Traditional navigable water 

(TNW), including territorial 

seas 

No No No No

2. Wetlands adjacent to TNWs No No No No

3. Relatively permanent waters 

(RPWs) that flow directly or 

indirectly into TNWs

No No No No

4. Non-RPWs that flow directly 

or indirectly into TNWs No No No No

5. Wetlands directly abutting 

RPWs that flow directly or 

indirectly into TNWs

No No No No

6. Wetlands adjacent to but not 

directly abutting RPWs that 

flow directly or indirectly into 

TNWs

No No No No

7. Wetlands adjacent to nonRPWs that flow directly or 

indirectly into TNWs

No No No No

8. Impoundments of 

jurisdictional waters No No No No

9. Isolated (interstate or 

intrastate) waters including 

isolated wetlands the use, 

degradation or destruction of 

which could affect interstate 

commerce

No No No No

Waters** that are not one of the 

above nine categories of potential 

Waters of the U.S.

Yes No No

Yes

Review Area: 

Non-RPWs 

Drainages Connecting 

the Review Area to 

Ivanpah Dry Lake: 

Non-RPWs

Ivanpah Dry Lake:

Isolated Water

* U.S. Army Corps of Engineers. 2007. Appendix B, Approved JD Form, Section II, in U.S. Army Corps of 

Engineers Jurisdictional Determination Form Instructional Guidebook. May 30.

** Areas that meet the technical criteria for wetlands (collective presence of hydric soil, wetland hydrology 

and wetland vegetation indicators) or have an Ordinary High Water Mark (OHWM) but have no significant 

nexus to a TNW or connection to interstate commerce. 33 CFR 328.3(a)(3) states: “All other waters such as 

intrastate lakes, rivers, streams (including intermittent streams), mudflats, sandflats, wetlands, sloughs, prairie 

potholes, wet meadows, playa lakes, or natural ponds, the use, degradation or destruction of which could affect 

interstate or foreign commerce including any such waters (i) which are or could be used by interstate or foreign 

travelers for recreational or other purposes; or (ii) From which fish or shellfish are or could be taken and sold 

in interstate or foreign commerce’ or (iii) Which are used or could be used for industrial purpose by industries 

in interstate commerce”

F-I.2-40
6.6 Disclaimer 

HBG has made a good-faith effort herein to thoroughly describe and document the 

presence of potential factors that the Corps may consider. Nevertheless, DXE reserves 

the right to challenge or seek revision to any areas over which the Corps may assert such 

jurisdiction, as the implementation of the Corps / EPA Rapanos Guidance is further 

clarified or altered through formal guidance, assertions or disclaimers of jurisdiction over 

other properties, court decisions, or other relevant actions. 

F-I.2-41
7.0 REFERENCES

Environmental Laboratory. 1987. Corps of Engineers Wetlands Delineation Manual. 

Technical Report Y-87-l, US Army Engineer Waterways Experiment Station, Vicksburg, 

Miss.

Field, J., & Pearthree, P. 1997. "Geomorphologic Flood-Hazard Assessment of Alluvial 

Fans and Piedmonts." Journal of Geoscience Education, Vol. 45, pp. 27 – 37. 

Hickman, J. (ed.). 1993. The Jepson Manual: Higher Plants of California. University of 

California Press, Berkeley, California.

Lichvar, R.W., D.C. Finnegan, and M.P. Ericsson. 2004. Using Hydrogeomorphic 

Surfaces for Delineating Floodplains: Black Water Creek Test Reach Within the Upper 

Puerco Watershed, Navajo Nation. ERDC/CRREL Technical Note 04-7. Hanover, NH: 

U.S. Army Engineer Research and Development Center, Cold Regions Research and 

Engineering Laboratory. November. 

Lichvar. R.W., and S.M. McColley. 2008. A Field Guide to the Identification of the 

Ordinary High Water Mark (OHWM) in the Arid West Region of the Western United 

States, A Delineation Manual. ERDC/CRREL TR-08-12. Hanover, NH: U.S. Army 

Engineer Research and Development Center, Cold Regions Research and Engineering 

Laboratory. August. 

Munz, P.A. 1974. A Flora of Southern California. University of California Press, 

Berkeley, California.

Reed, P.B., Jr. 1988. National List of Plant Species that Occur in Wetlands: National 

Summary. U.S. Fish and Wildlife Service Biological Report 88(24). 244 pp. 

Santos, P.F., N. Z. Elkins, Y. Steinberger and W. G. Whitford. “A Comparison of 

Surface and Buried Larrea Tridentata Leaf Litter Decomposition in North American Hot 

Deserts.” Ecology, Vol. 65, No. 1 (Feb., 1984), pp. 278-284. 

Sawyer, J.O., and T. Keeler-Wolf. 1995. A Manual of California Vegetation. 

Sacramento, CA: California Native Plant Society. 471 p. 

Simley, J.D. and J.W.Carswell Jr. 2009. National Hydrography Dataset (NHD). The 

National Map - Hydrography: U.S. Geological Survey Fact Sheet 2009-3054, 4 p. 

Strojan, C.L, D. C. Randall and F. B. Turner. 1987. “Relationship of Leaf Litter 

Decomposition Rates to Rainfall in the Mojave Desert.” Ecology, Vol. 68, No. 3 (Jun., 

1987), pp. 741-744. 

F-I.2-42
U.S. Army Corps of Engineers. 2008. Regional Supplement to the Corps of Engineers 

Wetland Delineation Manual: Arid West Region (Version 2.0), ed. J. S. Wakeley, R. W. 

Lichvar, and C. V. Noble. ERDC/EL TR-08-28. Vicksburg, MS: U.S. Army Engineer 

Research and Development Center.

U.S. Army Corps of Engineers. 2009. Vegetation and Channel Morphology Responses 

to Ordinary High Water Discharge Events in Arid West Stream Channels, ed. R. 

Lichvar, D. Cate, C. Photos, L. Dixon, B. Allen, and J. Byersdorfer. ERDC/CRREL TR09-5. Hanover, NH: U.S. Army Engineer Research and Development Center, Cold 

Regions Research and Engineering Laboratory. May. 

U.S. Department of Agriculture, Natural Resources Conservation Service. 1986. Urban 

Hydrology for Small Watersheds. Technical Release 55 (TR-55). June. 

US Department of Agriculture, National Resources Conservation Service. 2009. Web 

Soil Survey: http://websoilsurvey.nrcs.usda.gov 

F-I.2-43
Exhibit A

Figures

Figure 1 DesertXpress Project Alignment Alternatives

Figure 2 Location of Alignment Alternatives Within HUC-8 Watershed

Figure 3 Location of Study Area

Figure 4 Location of Study Area Within HUC-8 / HUC-12 Watersheds

Figures 5-12 Typical Examples of Field Indicators of Active Surface Water Flow and 

Ordinary High Water Marks Found Within Ephemeral Drainages 

Occurring Within the DesertXpress Project Study Area.

Figures 13-42 Examples of Drainages Found Within HUC-8 Watershed

F-I.2-44
Figure 1. DesertXpress Project Alignment Alternatives

Recent

SEGMENT 6B 

Alignment

Previous 

SEGMENT 7A and 7B

Previous

SEGMENT

Old Victorville Station

VICTORVILLE

BARSTOW

LAS VEGAS

NEVADA

CALIFORNIA

Yermo

Baker

Current Preferred

Victorville Station

Halloran Summit

Primm

Current Preferred

Las Vegas Station

Jean

Mountain Pass

SEGMENT

2 ALT C

SEGMENT 6 

ALT B

SEGMENT 4 ALT C

SEGMENT 5 ALT B

SEGMENT 1 

ALT B

SEGMENT 3 ALT B

Previous 

SEGMENT 7C

Previous SEGMENT Old 1

Previous

SEGMENT

Old 2

Previous 

SEGMENT 4A

Previous SEGMENT

6C Central A and B

Legend

Current Preferred Segments

SegName

SEGMENT 1 ALT B

SEGMENT 2 ALT C

SEGMENT 3 ALT B

SEGMENT 4 ALT C

SEGMENT 5 ALT B

SEGMENT 6 ALT B

Previous Segments

Label

Previous SEGMENT 4A

Previous SEGMENT 6C Central A and B

Previous SEGMENT 7A

Previous SEGMENT 7B

Previous SEGMENT 7C

Previous SEGMENT Old 1

Previous SEGMENT Old 2

Recent 6B Alignment

Current Preferred

Las Vegas Station

SEGMENT 6 ALT B

Previous 

SEGMENT 7C

Previous 

SEGMENT 7A and 7B

Recent 

SEGMENT 6B

Alignment

Previous

SEGMENT 6C

Central A and B

0 5 10 Miles

Previous SEGMENT Old 

Victorville Station

F-I.2-45
Baker

Primm

Jean Jean Lake

Roach Lake

Ivanpah

Lake

LAS VEGAS

SEGMENT 4 ALT C

SEGMENT 3 ALT B

Previous SEGMENT 4A

SEGMENT 5 ALT B

Mountain Pass

Figure 2. Location Of Alignment Alternatives Within HUC-8 Watershed

Legend

Ivanpah-Pahrump Valleys 

HUC 8 Watershed

Playa

0 5 10 15 20 25

Miles

California-Nevada State Line

N

e

v

a d

a

C

a

l

i f

o

r

n

i

a

F-I.2-46
F-I.2-47
F-I.2-48
Exhibit A. Figure 5. Typical examples of field indicators of active surface water flow and Ordinary High Water Marks found within ephemerals drainages occurring within the 

DesertXpress Project Study Area.

F-I.2-49
Exhibit A. Figure 6. Typical examples of field indicators of active surface water flow and Ordinary High Water Marks found within ephemerals drainages occurring within the 

DesertXpress Project Study Area.

F-I.2-50
Exhibit A. Figure 7. Typical examples of field indicators of active surface water flow and Ordinary High Water Marks found within ephemerals drainages occurring within the 

DesertXpress Project Study Area.

F-I.2-51
Exhibit A. Figure 8. Typical examples of field indicators of active surface water flow and Ordinary High Water Marks found within ephemerals drainages occurring within the 

DesertXpress Project Study Area.

F-I.2-52
Exhibit A. Figure 9. Typical examples of field indicators of active surface water flow and Ordinary High Water Marks found within ephemerals drainages occurring within the 

DesertXpress Project Study Area. F-I.2-53
Exhibit A. Figure 10. Typical examples of field indicators of active surface water flow and Ordinary High Water Marks found within ephemerals drainages occurring 

within the DesertXpress Project Study Area.

F-I.2-54
Exhibit A. Figure 11. Typical examples of field indicators of active surface water flow and Ordinary High Water Marks found within ephemerals drainages occurring within the 

DesertXpress Project Study Area.

F-I.2-55
Exhibit A. Figure 12. Typical examples of field indicators of active surface water flow and Ordinary High Water Marks found within ephemerals drainages occurring within the 

DesertXpress Project Study Area.

F-I.2-56
Exhibit A. Figure 13. Manmade drainage connecting to road culvert within HUC 8 Ivanpah-Pahrump 

Valleys Watersheds / HUC 12 Ivanpah Subwatershed

Exhibit A. Figure 14. Ephemeral drainage within HUC 8 Ivanpah-Pahrump Valleys Watersheds / 

HUC 12 Ivanpah Subwatershed

F-I.2-57
Exhibit A. Figure 15. Manmade drainage connecting to road culvert within HUC 8 Ivanpah-Pahrump 

Valleys Watersheds / HUC 12 Ivanpah Subwatershed

Exhibit A. Figure 16. Manmade drainage connecting to road culvert within HUC 8 IvanpahPahrump Valleys Watersheds / HUC 12 Ivanpah Subwatershed

F-I.2-58
Exhibit A. Figure 17. Manmade drainage connecting to ephemeral drainage within HUC 8 IvanpahPahrump Valleys Watersheds / HUC 12 Porter Wash -Frontal Ivanpah Lake Subwatershed

Exhibit A. Figure 18. Manmade drainage connecting to road culvert within HUC 8 Ivanpah-Pahrump 

Valleys Watersheds / HUC 12 Porter Wash 

F-I.2-59 -Frontal Ivanpah Lake Subwatershed
Exhibit A. Figure 19. Manmade drainage connecting to road culvert within HUC 8 Ivanpah-Pahrump 

Valleys Watersheds / HUC 12 Porter Wash -Frontal Ivanpah Lake Subwatershed

Exhibit A. Figure 20. Ephemeral drainage connecting to road culvert within HUC 8 IvanpahPahrump Valleys Watersheds / HUC 12 Porter Wash 

F-I.2-60 -Frontal Ivanpah Lake Subwatershed
Exhibit A. Figure 21. Ephemeral drainage connecting to road culvert within HUC 8 IvanpahPahrump Valleys Watersheds / HUC 12 Porter Wash -Frontal Ivanpah Lake Subwatershed

Exhibit A. Figure 22. Manmade drainage connecting to ephemeral drainage within HUC 8 IvanpahPahrump Valleys Watersheds / HUC 12 Porter Wash 

F-I.2-61 -Frontal Ivanpah Lake Subwatershed
Exhibit A. Figure 23. Ephemeral drainage connecting to road culvert within HUC 8 IvanpahPahrump Valleys Watersheds / HUC 12 Porter Wash -Frontal Ivanpah Lake Subwatershed

 Exhibit A. Figure 24. Manmade drainage connecting to ephemeral drainage within HUC 8 IvanpahPahrump Valleys Watersheds / HUC 12 Porter Wash 

F-I.2-62 -Frontal Ivanpah Lake Subwatershed
Exhibit A. Figure 25. Manmade drainage connecting to road culvert within HUC 8 IvanpahPahrump Valleys Watersheds / HUC 12 Porter Wash -Frontal Ivanpah Lake Subwatershed

Exhibit A. Figure 26. Manmade drainage connecting to road culvert within HUC 8 Ivanpah-Pahrump

Valleys Watersheds / HUC 12 Town of Jean 

F-I.2-63 -Frontal Ivanpah Lake Subwatershed
Exhibit A. Figure 27. Ephemeral drainage within HUC 8 Ivanpah-Pahrump Valleys Watersheds / 

HUC 12 Town of Jean -Frontal Ivanpah Lake Subwatershed

Exhibit A. Figure 28. Manmade drainage connecting to road culvert within HUC 8 Ivanpah-Pahrump 

Valleys Watersheds / HUC 12 Town of Jean 

F-I.2-64 -Frontal Ivanpah Lake Subwatershed
Exhibit A. Figure 29. Manmade drainage connecting to road culvert within HUC 8 Ivanpah-Pahrump 

Valleys Watersheds / HUC 12 Town of Jean -Frontal Ivanpah Lake Subwatershed

Exhibit A. Figure 30. Manmade drainage connecting to road culvert within HUC 8 Ivanpah-Pahrump 

Valleys Watersheds / HUC 12 Town of Jean -

F-I.2-65

Frontal Ivanpah Lake Subwatershed
Exhibit A. Figure 31. Manmade drainage connecting to road culvert within HUC 8 Ivanpah-Pahrump 

Valleys Watersheds / HUC 12 Town of Jean -Frontal Ivanpah Lake Subwatershed

Exhibit A. Figure 32. Manmade drainage connecting to road culvert within HUC 8 Ivanpah-Pahrump 

Valleys Watersheds / HUC 12 Town of Jean 

F-I.2-66 -Frontal Ivanpah Lake Subwatershed
Exhibit A. Figure 33. Manmade drainage connecting to road culvert within HUC 8 Ivanpah-Pahrump 

Valleys Watersheds / HUC 12 Town of Jean -Frontal Ivanpah Lake Subwatershed

Exhibit A. Figure 34. Manmade drainage connecting to road culvert within HUC 8 Ivanpah-Pahrump 

Valleys Watersheds / HUC 12 Town of Jean 

F-I.2-67 -Frontal Ivanpah Lake Subwatershed
Exhibit A. Figure 35. Manmade drainage connecting to road culvert within HUC 8 Ivanpah-Pahrump 

Valleys Watersheds / HUC 12 Town of Jean -Frontal Ivanpah Lake Subwatershed

Exhibit A. Figure 36. Manmade drainage connecting to road culvert within HUC 8 Ivanpah-Pahrump 

Valleys / HUC 12 Town of Goodsprings Subwatershed

F-I.2-68
 Exhibit A. Figure 37. Ephemeral drainage within HUC 8 Ivanpah-Pahrump Valleys / HUC 12 Town of 

Goodsprings Subwatershed

Exhibit A. Figure 38. Manmade drainage connecting to ephemeral drainage within HUC 8 IvanpahPahrump Valleys / HUC 12 160600151401-Frontal Jean Lake Subwatershed

F-I.2-69
Exhibit A. Figure 39. Manmade drainage connecting to road culvert within HUC 8 Ivanpah-Pahrump 

Valleys / HUC 12 160600151401-Frontal Jean Lake Subwatershed

Exhibit A. Figure 40. Manmade drainage connecting to ephemeral drainage within HUC 8 IvanpahPahrump Valleys / HUC 12 160600151401-Frontal Jean Lake Subwatershed

F-I.2-70
Exhibit A. Figure 41. Ephemeral drainage connecting to road culvert within HUC 8 Ivanpah-Pahrump

Valleys / HUC 12 160600151401-Frontal Jean Lake Subwatershed

Exhibit A. Figure 42. Ephemeral drainage within HUC 8 Ivanpah-Pahrump Valleys / HUC 12 

160600151401-Frontal Jean Lake Subwatershed

F-I.2-71
Exhibit B

Field Data

Exhibit B1 Required Corps Waters Data Summary Table

Exhibit B2 Field Data* 

(Exhibit B2 provided on attached CD in PDF format.)

F-I.2-72
Exhibit B1

Required Corps Waters Data Summary Table

F-I.2-73
2/14/2011 7:15 PM

Waters

_

Name

Cowardin_Code HGM_Code

Area (acres) Linear (ft)

Waters Types

Latitude (dd nad83)

Longitude (dd nad83) Local_Waterway

D-28-3 R6 RIVERINE 0.479982 2090.8 NRPW 35.469048 -115.534003 Wheaton Wash-Frontal Ivanpah Lake D-28-4 R6 RIVERINE 0.165381 720.4 NRPW 35.469455 -115.536374 Wheaton Wash-Frontal Ivanpah Lake D-28-5 R6 RIVERINE 0.023531 102.5 NRPW 35.469441 -115.533154 Wheaton Wash-Frontal Ivanpah Lake D-28-6 R6 RIVERINE 0.054477 237.3 NRPW 35.469094 -115.532528 Wheaton Wash-Frontal Ivanpah Lake D-28-7 R6 RIVERINE 0.092218 401.7 NRPW 35.469207 -115.531216 Wheaton Wash-Frontal Ivanpah Lake D-28-8 R6 RIVERINE 0.003227 156.2 NRPW 35.469032 -115.530491 Wheaton Wash-Frontal Ivanpah Lake D-28-9 R6 RIVERINE 0.083907 365.5 NRPW 35.468580 -115.529527 Wheaton Wash-Frontal Ivanpah Lake D-28-10 R6 RIVERINE 0.020707 90.2 NRPW 35.468358 -115.527264 Wheaton Wash-Frontal Ivanpah Lake D-28-11 R6 RIVERINE 0.087167 379.7 NRPW 35.468411 -115.527911 Wheaton Wash-Frontal Ivanpah Lake D-28-12 R6 RIVERINE 0.038797 169.0 NRPW 35.468744 -115.526708 Wheaton Wash-Frontal Ivanpah Lake D-28-13 R6 RIVERINE 0.045340 197.5 NRPW 35.468865 -115.526990 Wheaton Wash-Frontal Ivanpah Lake D-28-17 R6 RIVERINE 0.491667 1427.8 NRPW 35.468832 -115.519500 Wheaton Wash-Frontal Ivanpah Lake D-28-19 R6 RIVERINE 0.009921 254.2 NRPW 35.469061 -115.517205 Wheaton Wash-Frontal Ivanpah Lake D-28-21 R6 RIVERINE 0.017631 76.8 NRPW 35.469028 -115.518910 Wheaton Wash-Frontal Ivanpah Lake D-28-23 R6 RIVERINE 0.053558 233.3 NRPW 35.468784 -115.520569 Wheaton Wash-Frontal Ivanpah Lake D-28-24 R6 RIVERINE 0.046419 202.2 NRPW 35.468501 -115.520566 Wheaton Wash-Frontal Ivanpah Lake D-28-25 R6 RIVERINE 0.316736 1379.7 NRPW 35.468358 -115.522927 Wheaton Wash-Frontal Ivanpah Lake D-28-26 R6 RIVERINE 0.079293 345.4 NRPW 35.468733 -115.521001 Wheaton Wash-Frontal Ivanpah Lake D-28-27 R6 RIVERINE 0.008996 230.5 NRPW 35.469333 -115.515778 Wheaton Wash-Frontal Ivanpah Lake D-28-34 R6 RIVERINE 0.010475 268.4 NRPW 35.470799 -115.509843 Wheaton Wash-Frontal Ivanpah Lake D-28-35 R6 RIVERINE 0.064909 336.6 NRPW 35.471108 -115.508754 Wheaton Wash-Frontal Ivanpah Lake D-28-36 R6 RIVERINE 0.014190 363.6 NRPW 35.471102 -115.508222 Wheaton Wash-Frontal Ivanpah Lake D-28-37 R6 RIVERINE 0.010806 276.9 NRPW 35.471372 -115.508060 Wheaton Wash-Frontal Ivanpah Lake D-28-38 R6 RIVERINE 0.011056 283.3 NRPW 35.471405 -115.507707 Wheaton Wash-Frontal Ivanpah Lake D-28-42 R6 RIVERINE 0.017074 437.5 NRPW 35.472289 -115.505506 Wheaton Wash-Frontal Ivanpah Lake D-28-43 R6 RIVERINE 0.023880 611.9 NRPW 35.472688 -115.504683 Wheaton Wash-Frontal Ivanpah Lake D-28-44 R6 RIVERINE 0.009238 236.7 NRPW 35.473531 -115.502909 Wheaton Wash-Frontal Ivanpah Lake D-28-46 R6 RIVERINE 0.060758 441.1 NRPW 35.475113 -115.501640 Wheaton Wash-Frontal Ivanpah Lake D-28-47 R6 RIVERINE 0.004792 122.8 NRPW 35.475409 -115.501940 Wheaton Wash-Frontal Ivanpah Lake D-28-48 R6 RIVERINE 0.038696 421.4 NRPW 35.476426 -115.500529 Wheaton Wash-Frontal Ivanpah Lake D-28-49 R6 RIVERINE 0.150344 436.6 NRPW 35.477910 -115.499513 Wheaton Wash-Frontal Ivanpah Lake D-28-50 R6 RIVERINE 0.165124 599.4 NRPW 35.478675 -115.499082 Wheaton Wash-Frontal Ivanpah Lake D-28-56 R6 RIVERINE 0.104155 453.7 NRPW 35.488143 -115.498944 Wheaton Wash-Frontal Ivanpah Lake D-28-57 R6 RIVERINE 0.015989 409.7 NRPW 35.490764 -115.500428 Wheaton Wash-Frontal Ivanpah Lake D-28-58 R6 RIVERINE 0.269284 469.2 NRPW 35.495665 -115.504539 Wheaton Wash-Frontal Ivanpah Lake D-28-59 R6 RIVERINE 0.128145 558.2 NRPW 35.497116 -115.505768 Wheaton Wash-Frontal Ivanpah Lake D-28-60 R6 RIVERINE 0.019466 498.8 NRPW 35.499385 -115.507358 Wheaton Wash-Frontal Ivanpah Lake D-28-61 R6 RIVERINE 0.028691 416.6 NRPW 35.500118 -115.507955 Wheaton Wash-Frontal Ivanpah Lake Exhibit B1. Study Area Field Data for Areas Potentially Subject to Corps Jurisdiction, HUC-8 Ivanpah-Pahrump Valleys, Preferred RDesertXpress Project

J:\DesertXpress\Revised JD Spreadsheets 2-2-11\GWB Formatted 02 14 11\Ivanpah-Pahrump_Valleys 110214gwb Ivanpah-Pahrump_Valley

F-I.2-74
2/14/2011 7:15 PM

Waters

_

Name

Cowardin_Code HGM_Code

Area (acres) Linear (ft)

Waters Types

Latitude (dd nad83)

Longitude (dd nad83) Local_Waterway

Exhibit B1. Study Area Field Data for Areas Potentially Subject to Corps Jurisdiction, HUC-8 Ivanpah-Pahrump Valleys, Preferred RDesertXpress Project

D-28-62 R6 RIVERINE 0.117080 425.0 NRPW 35.501005 -115.508488 Wheaton Wash-Frontal Ivanpah Lake D-28-63 R6 RIVERINE 0.186731 406.7 NRPW 35.503023 -115.509763 Wheaton Wash-Frontal Ivanpah Lake D-28-64 R6 RIVERINE 0.116281 422.1 NRPW 35.507981 -115.511667 Wheaton Wash-Frontal Ivanpah Lake D-28-65 R6 RIVERINE 0.006912 177.1 NRPW 35.507631 -115.511988 Wheaton Wash-Frontal Ivanpah Lake D-28-66 R6 RIVERINE 0.044821 162.7 NRPW 35.507913 -115.512044 Wheaton Wash-Frontal Ivanpah Lake D-28-67 R6 RIVERINE 0.016321 418.2 NRPW 35.508723 -115.511778 Wheaton Wash-Frontal Ivanpah Lake D-28-68 R6 RIVERINE 0.343884 416.1 NRPW 35.515278 -115.512043 Wheaton Wash-Frontal Ivanpah Lake D-28-69 R6 RIVERINE 0.017991 461.0 NRPW 35.518491 -115.511790 Wheaton Wash-Frontal Ivanpah Lake D-28-70 R6 RIVERINE 0.091906 476.6 NRPW 35.520075 -115.511519 Wheaton Wash-Frontal Ivanpah Lake D-28-71 R6 RIVERINE 0.104017 453.1 NRPW 35.520460 -115.511505 Wheaton Wash-Frontal Ivanpah Lake D-28-72 R6 RIVERINE 0.134745 451.5 NRPW 35.521917 -115.511185 Wheaton Wash-Frontal Ivanpah Lake D-28-73 R6 RIVERINE 0.016009 410.2 NRPW 35.522257 -115.511276 Wheaton Wash-Frontal Ivanpah Lake D-28-74 R6 RIVERINE 0.090083 436.0 NRPW 35.524776 -115.510940 Wheaton Wash-Frontal Ivanpah Lake D-28-75 R6 RIVERINE 0.017222 441.3 NRPW 35.525654 -115.510812 Wheaton Wash-Frontal Ivanpah Lake D-28-76 R6 RIVERINE 0.056350 409.1 NRPW 35.526089 -115.510815 Wheaton Wash-Frontal Ivanpah Lake D-28-77 R6 RIVERINE 0.015837 405.8 NRPW 35.526680 -115.510754 Wheaton Wash-Frontal Ivanpah Lake D-28-78 R6 RIVERINE 0.412810 399.6 NRPW 35.526971 -115.510722 Wheaton Wash-Frontal Ivanpah Lake D-28-79 R6 RIVERINE 0.017078 437.6 NRPW 35.538605 -115.509432 Wheaton Wash-Frontal Ivanpah Lake D-28-81 R6 RIVERINE 0.025598 655.9 NRPW 35.540087 -115.509151 Wheaton Wash-Frontal Ivanpah Lake D-28-83 R6 RIVERINE 0.015583 399.3 NRPW 35.542145 -115.508943 Wheaton Wash-Frontal Ivanpah Lake D-28-86 R6 RIVERINE 0.024353 408.0 NRPW 35.543519 -115.508788 Wheaton Wash-Frontal Ivanpah Lake D-28-87 R6 RIVERINE 0.016062 437.3 NRPW 35.543836 -115.508756 Wheaton Wash-Frontal Ivanpah Lake D-28-88 R6 RIVERINE 0.004815 419.5 NRPW 35.544431 -115.508677 Wheaton Wash-Frontal Ivanpah Lake D-28-89 R6 RIVERINE 0.004660 406.0 NRPW 35.544369 -115.508682 Wheaton Wash-Frontal Ivanpah Lake D-28-91 R6 RIVERINE 0.015243 415.0 NRPW 35.543991 -115.508720 Wheaton Wash-Frontal Ivanpah Lake D-28-92 R6 RIVERINE 0.013512 218.0 NRPW 35.469309 -115.530978 Wheaton Wash-Frontal Ivanpah Lake D-28-93 R6 RIVERINE 0.113774 590.0 NRPW 35.471345 -115.506578 Wheaton Wash-Frontal Ivanpah Lake D-28-94 R6 RIVERINE 0.072835 377.7 NRPW 35.471692 -115.506678 Wheaton Wash-Frontal Ivanpah Lake D-28-95 R6 RIVERINE 0.017359 444.8 NRPW 35.493119 -115.502305 Wheaton Wash-Frontal Ivanpah Lake D-28-96 R6 RIVERINE 0.013019 333.6 NRPW 35.492693 -115.502241 Wheaton Wash-Frontal Ivanpah Lake D-28-97 R6 RIVERINE 0.023256 595.9 NRPW 35.492360 -115.501673 Wheaton Wash-Frontal Ivanpah Lake D-28-98 R6 RIVERINE 0.017195 440.6 NRPW 35.493485 -115.502583 Wheaton Wash-Frontal Ivanpah Lake D-28-99 R6 RIVERINE 0.017929 459.4 NRPW 35.493644 -115.502806 Wheaton Wash-Frontal Ivanpah Lake D-28-100 R6 RIVERINE 0.058581 425.3 NRPW 35.506126 -115.511082 Wheaton Wash-Frontal Ivanpah Lake D-28-101 R6 RIVERINE 0.032004 464.7 NRPW 35.510315 -115.512083 Wheaton Wash-Frontal Ivanpah Lake D-28-102 R6 RIVERINE 0.031591 458.7 NRPW 35.511740 -115.512190 Wheaton Wash-Frontal Ivanpah Lake D-28-103 R6 RIVERINE 0.104568 455.5 NRPW 35.513287 -115.512230 Wheaton Wash-Frontal Ivanpah Lake D-28-104 R6 RIVERINE 0.014190 363.6 NRPW 35.514999 -115.512452 Wheaton Wash-Frontal Ivanpah Lake 

J:\DesertXpress\Revised JD Spreadsheets 2-2-11\GWB Formatted 02 14 11\Ivanpah-Pahrump_Valleys 110214gwb Ivanpah-Pahrump_Valley

F-I.2-75
2/14/2011 7:15 PM

Waters

_

Name

Cowardin_Code HGM_Code

Area (acres) Linear (ft)

Waters Types

Latitude (dd nad83)

Longitude (dd nad83) Local_Waterway

Exhibit B1. Study Area Field Data for Areas Potentially Subject to Corps Jurisdiction, HUC-8 Ivanpah-Pahrump Valleys, Preferred RDesertXpress Project

D-28-105 R6 RIVERINE 0.034137 874.7 NRPW 35.516725 -115.511594 Wheaton Wash-Frontal Ivanpah Lake D-28-106 R6 RIVERINE 0.023221 595.0 NRPW 35.517483 -115.511863 Wheaton Wash-Frontal Ivanpah Lake D-28-107 R6 RIVERINE 0.019939 510.9 NRPW 35.521033 -115.511421 Wheaton Wash-Frontal Ivanpah Lake D-28-108 R6 RIVERINE 0.029208 424.1 NRPW 35.523906 -115.511081 Wheaton Wash-Frontal Ivanpah Lake D-28-109 R6 RIVERINE 0.003953 101.3 NRPW 35.529022 -115.510987 Wheaton Wash-Frontal Ivanpah Lake D-28-110 R6 RIVERINE 0.195826 473.9 NRPW 35.529141 -115.510545 Wheaton Wash-Frontal Ivanpah Lake D-28-111 R6 RIVERINE 0.040340 439.3 NRPW 35.530316 -115.510305 Wheaton Wash-Frontal Ivanpah Lake D-28-112 R6 RIVERINE 0.605234 439.4 NRPW 35.532597 -115.510070 Wheaton Wash-Frontal Ivanpah Lake D-28-113 R6 RIVERINE 0.247314 513.0 NRPW 35.533143 -115.510005 Wheaton Wash-Frontal Ivanpah Lake D-28-114 R6 RIVERINE 0.082167 447.4 NRPW 35.539250 -115.509245 Wheaton Wash-Frontal Ivanpah Lake D-28-115 R6 RIVERINE 0.080355 416.7 NRPW 35.541504 -115.509039 Wheaton Wash-Frontal Ivanpah Lake D-28-116 R6 RIVERINE 0.004067 104.2 NRPW 35.491939 -115.500696 Wheaton Wash-Frontal Ivanpah Lake D-28-117 R6 RIVERINE 0.002283 58.5 NRPW 35.495604 -115.504395 Wheaton Wash-Frontal Ivanpah Lake D-28-118 R6 RIVERINE 0.008441 216.3 NRPW 35.496839 -115.505612 Wheaton Wash-Frontal Ivanpah Lake D-28-119 R6 RIVERINE 0.045510 236.0 NRPW 35.520138 -115.511803 Wheaton Wash-Frontal Ivanpah Lake D-28-120 R6 RIVERINE 0.008926 216.0 NRPW 35.521918 -115.510941 Wheaton Wash-Frontal Ivanpah Lake D-28-121 R6 RIVERINE 0.042103 366.8 NRPW 35.532286 -115.510263 Wheaton Wash-Frontal Ivanpah Lake D-28-122 R6 RIVERINE 0.036639 532.0 NRPW 35.537581 -115.509573 Wheaton Wash-Frontal Ivanpah Lake D-28-123 R6 RIVERINE 0.056501 410.2 NRPW 35.535875 -115.509681 Wheaton Wash-Frontal Ivanpah Lake D-28-124 R6 RIVERINE 0.038338 417.5 NRPW 35.530861 -115.510258 Wheaton Wash-Frontal Ivanpah Lake D-28-125 R6 RIVERINE 0.014982 652.6 NRPW 35.506978 -115.511202 Wheaton Wash-Frontal Ivanpah Lake D-28-126 R6 RIVERINE 0.019527 425.3 NRPW 35.502119 -115.509231 Wheaton Wash-Frontal Ivanpah Lake D-28-127 R6 RIVERINE 0.020588 448.4 NRPW 35.479417 -115.498833 Wheaton Wash-Frontal Ivanpah Lake D-28-135 R6 RIVERINE 0.001407 122.6 NRPW 35.544387 -115.508689 Wheaton Wash-Frontal Ivanpah Lake D-30-1 R6 RIVERINE 0.000904 24.6 NRPW 35.607640 -115.411184 Ivanpah Lake D-30-2 R6 RIVERINE 0.002373 64.6 NRPW 35.607789 -115.410750 Ivanpah Lake D-30-3 R6 RIVERINE 0.001146 31.2 NRPW 35.607686 -115.411016 Ivanpah Lake D-30-4 R6 RIVERINE 0.003016 82.1 NRPW 35.607958 -115.410083 Ivanpah Lake D-30-5 R6 RIVERINE 0.002872 78.2 NRPW 35.607933 -115.410162 Ivanpah Lake D-30-6 R6 RIVERINE 0.010105 275.1 NRPW 35.608688 -115.408099 Ivanpah Lake D-30-7 R6 RIVERINE 0.016283 443.3 NRPW 35.610083 -115.404767 Ivanpah Lake D-30-8 R6 RIVERINE 0.015809 430.4 NRPW 35.610265 -115.404431 Ivanpah Lake D-30-9 R6 RIVERINE 0.015449 420.6 NRPW 35.610719 -115.403087 Ivanpah Lake D-30-10 R6 RIVERINE 0.012275 334.2 NRPW 35.610912 -115.402919 Ivanpah Lake D-30-11 R6 RIVERINE 0.008268 225.1 NRPW 35.610469 -115.404391 Ivanpah Lake D-30-12 R6 RIVERINE 0.007963 216.8 NRPW 35.608529 -115.408540 Ivanpah Lake D-30-13 R6 RIVERINE 0.006461 175.9 NRPW 35.608401 -115.408720 Ivanpah Lake D-30-14 R6 RIVERINE 0.004437 120.8 NRPW 35.608445 -115.408950 Ivanpah Lake 

J:\DesertXpress\Revised JD Spreadsheets 2-2-11\GWB Formatted 02 14 11\Ivanpah-Pahrump_Valleys 110214gwb Ivanpah-Pahrump_Valley

F-I.2-76
2/14/2011 7:15 PM

Waters

_

Name

Cowardin_Code HGM_Code

Area (acres) Linear (ft)

Waters Types

Latitude (dd nad83)

Longitude (dd nad83) Local_Waterway

Exhibit B1. Study Area Field Data for Areas Potentially Subject to Corps Jurisdiction, HUC-8 Ivanpah-Pahrump Valleys, Preferred RDesertXpress Project

D-30-15 R6 RIVERINE 0.014296 389.2 NRPW 35.609500 -115.406218 Ivanpah Lake D-30-16 R6 RIVERINE 0.016353 445.2 NRPW 35.609789 -115.405404 Ivanpah Lake D-30-17 R6 RIVERINE 0.009565 260.4 NRPW 35.609599 -115.405390 Ivanpah Lake D-30-18 R6 RIVERINE 0.015438 420.3 NRPW 35.610601 -115.403412 Ivanpah Lake D-30-19 R6 RIVERINE 0.014938 406.7 NRPW 35.612581 -115.399536 Ivanpah Lake D-30-20 R6 RIVERINE 0.023330 406.5 NRPW 35.611858 -115.400794 Ivanpah Lake D-30-45 R6 RIVERINE 0.001343 41.8 NRPW 35.613790 -115.398330 Ivanpah Lake D-30-46 R6 RIVERINE 0.007371 321.1 NRPW 35.700998 -115.369204 Ivanpah Lake D-30-47 R6 RIVERINE 0.007082 308.5 NRPW 35.695799 -115.371062 Ivanpah Lake D-30-48 R6 RIVERINE 0.007532 328.1 NRPW 35.693588 -115.371838 Ivanpah Lake D-30-49 R6 RIVERINE 0.007303 318.1 NRPW 35.691722 -115.372500 Ivanpah Lake D-30-50 R6 RIVERINE 0.007332 319.4 NRPW 35.688318 -115.373675 Ivanpah Lake D-30-51 R6 RIVERINE 0.023781 345.3 NRPW 35.684672 -115.374908 Ivanpah Lake D-30-52 R6 RIVERINE 0.020551 298.4 NRPW 35.681496 -115.375767 Ivanpah Lake D-30-53 R6 RIVERINE 0.020537 298.2 NRPW 35.673669 -115.377030 Ivanpah Lake D-30-54 R6 RIVERINE 0.022927 332.9 NRPW 35.664251 -115.378689 Ivanpah Lake D-30-55 R6 RIVERINE 0.020654 299.9 NRPW 35.670311 -115.377622 Ivanpah Lake D-30-56 R6 RIVERINE 0.014105 307.2 NRPW 35.666434 -115.378319 Ivanpah Lake D-30-57 R6 RIVERINE 0.041377 300.4 NRPW 35.657919 -115.379722 Ivanpah Lake D-31-1 R6 RIVERINE 0.014635 425.0 NRPW 35.545231 -115.508559 Whisky Spring-Frontal Ivanpah Lake D-31-2 R6 RIVERINE 0.021490 407.0 NRPW 35.545855 -115.508513 Whisky Spring-Frontal Ivanpah Lake D-31-3 R6 RIVERINE 0.014975 407.7 NRPW 35.556278 -115.507281 Whisky Spring-Frontal Ivanpah Lake D-31-4 R6 RIVERINE 0.016129 439.1 NRPW 35.556489 -115.507225 Whisky Spring-Frontal Ivanpah Lake D-31-7 R6 RIVERINE 0.014916 406.1 NRPW 35.557901 -115.507091 Whisky Spring-Frontal Ivanpah Lake D-31-8 R6 RIVERINE 0.014803 403.0 NRPW 35.558257 -115.507046 Whisky Spring-Frontal Ivanpah Lake D-31-9 R6 RIVERINE 0.094904 413.4 NRPW 35.558775 -115.506979 Whisky Spring-Frontal Ivanpah Lake D-31-10 R6 RIVERINE 0.004371 119.0 NRPW 35.558981 -115.507465 Whisky Spring-Frontal Ivanpah Lake D-31-11 R6 RIVERINE 0.031515 457.6 NRPW 35.559806 -115.506890 Whisky Spring-Frontal Ivanpah Lake D-31-12 R6 RIVERINE 0.014773 402.2 NRPW 35.560221 -115.506855 Whisky Spring-Frontal Ivanpah Lake D-31-13 R6 RIVERINE 0.015085 410.7 NRPW 35.561484 -115.506671 Whisky Spring-Frontal Ivanpah Lake D-31-14 R6 RIVERINE 0.077479 337.5 NRPW 35.561120 -115.506969 Whisky Spring-Frontal Ivanpah Lake D-31-18 R6 RIVERINE 0.046143 502.5 NRPW 35.563733 -115.506422 Whisky Spring-Frontal Ivanpah Lake D-31-19 R6 RIVERINE 0.020950 456.3 NRPW 35.563468 -115.506438 Whisky Spring-Frontal Ivanpah Lake D-31-20 R6 RIVERINE 0.038678 421.2 NRPW 35.564319 -115.506341 Whisky Spring-Frontal Ivanpah Lake D-31-21 R6 RIVERINE 0.113609 412.4 NRPW 35.564924 -115.506283 Whisky Spring-Frontal Ivanpah Lake D-31-22 R6 RIVERINE 0.004500 122.5 NRPW 35.564979 -115.506739 Whisky Spring-Frontal Ivanpah Lake D-31-23 R6 RIVERINE 0.013157 358.2 NRPW 35.564785 -115.506390 Whisky Spring-Frontal Ivanpah Lake D-31-24 R6 RIVERINE 0.142149 412.8 NRPW 35.565339 -115.506222 Whisky Spring-Frontal Ivanpah Lake 

J:\DesertXpress\Revised JD Spreadsheets 2-2-11\GWB Formatted 02 14 11\Ivanpah-Pahrump_Valleys 110214gwb Ivanpah-Pahrump_Valley

F-I.2-77
2/14/2011 7:15 PM

Waters

_

Name

Cowardin_Code HGM_Code

Area (acres) Linear (ft)

Waters Types

Latitude (dd nad83)

Longitude (dd nad83) Local_Waterway

Exhibit B1. Study Area Field Data for Areas Potentially Subject to Corps Jurisdiction, HUC-8 Ivanpah-Pahrump Valleys, Preferred RDesertXpress Project

D-31-25 R6 RIVERINE 0.513453 422.0 NRPW 35.567355 -115.505968 Whisky Spring-Frontal Ivanpah Lake D-31-26 R6 RIVERINE 0.056322 408.9 NRPW 35.567979 -115.505917 Whisky Spring-Frontal Ivanpah Lake D-31-28 R6 RIVERINE 0.114463 415.5 NRPW 35.568431 -115.505851 Whisky Spring-Frontal Ivanpah Lake D-31-29 R6 RIVERINE 0.015140 412.2 NRPW 35.568497 -115.505864 Whisky Spring-Frontal Ivanpah Lake D-31-30 R6 RIVERINE 0.156612 454.8 NRPW 35.569032 -115.505776 Whisky Spring-Frontal Ivanpah Lake D-31-35 R6 RIVERINE 0.015313 416.9 NRPW 35.570569 -115.505623 Whisky Spring-Frontal Ivanpah Lake D-31-37 R6 RIVERINE 0.015526 422.7 NRPW 35.570205 -115.505649 Whisky Spring-Frontal Ivanpah Lake D-31-38 R6 RIVERINE 0.009991 272.0 NRPW 35.570289 -115.505869 Whisky Spring-Frontal Ivanpah Lake D-31-39 R6 RIVERINE 0.220937 401.0 NRPW 35.570843 -115.505577 Whisky Spring-Frontal Ivanpah Lake D-31-42 R6 RIVERINE 0.042103 458.5 NRPW 35.572002 -115.505528 Whisky Spring-Frontal Ivanpah Lake D-31-43 R6 RIVERINE 0.036529 994.5 NRPW 35.573102 -115.504485 Whisky Spring-Frontal Ivanpah Lake D-31-44 R6 RIVERINE 0.036973 1006.6 NRPW 35.573292 -115.504498 Whisky Spring-Frontal Ivanpah Lake D-31-45 R6 RIVERINE 0.005028 136.9 NRPW 35.572751 -115.505815 Whisky Spring-Frontal Ivanpah Lake D-31-48 R6 RIVERINE 0.472548 980.2 NRPW 35.573950 -115.504338 Whisky Spring-Frontal Ivanpah Lake D-31-49 R6 RIVERINE 0.027949 760.9 NRPW 35.574604 -115.504541 Whisky Spring-Frontal Ivanpah Lake D-31-50 R6 RIVERINE 0.254878 444.1 NRPW 35.575856 -115.504857 Whisky Spring-Frontal Ivanpah Lake D-31-60 R6 RIVERINE 0.164959 449.1 NRPW 35.577004 -115.504651 Whisky Spring-Frontal Ivanpah Lake D-31-63 R6 RIVERINE 0.051090 445.1 NRPW 35.577677 -115.504538 Whisky Spring-Frontal Ivanpah Lake D-31-64 R6 RIVERINE 0.059284 430.4 NRPW 35.578841 -115.504182 Whisky Spring-Frontal Ivanpah Lake D-31-65 R6 RIVERINE 0.016062 437.3 NRPW 35.578415 -115.504349 Whisky Spring-Frontal Ivanpah Lake D-31-75 R6 RIVERINE 0.070627 439.5 NRPW 35.580030 -115.503817 Whisky Spring-Frontal Ivanpah Lake D-31-86 R6 RIVERINE 0.079210 431.3 NRPW 35.581538 -115.503163 Whisky Spring-Frontal Ivanpah Lake D-31-94 R6 RIVERINE 0.049415 430.5 NRPW 35.582906 -115.502503 Whisky Spring-Frontal Ivanpah Lake D-31-99 R6 RIVERINE 0.057874 504.2 NRPW 35.584403 -115.501613 Whisky Spring-Frontal Ivanpah Lake D-31-100 R6 RIVERINE 0.035611 387.8 NRPW 35.584860 -115.501391 Whisky Spring-Frontal Ivanpah Lake D-31-108 R6 RIVERINE 0.112741 491.1 NRPW 35.586560 -115.500176 Whisky Spring-Frontal Ivanpah Lake D-31-117 R6 RIVERINE 0.021235 462.5 NRPW 35.587028 -115.499876 Whisky Spring-Frontal Ivanpah Lake D-31-119 R6 RIVERINE 0.016320 444.3 NRPW 35.588046 -115.498931 Whisky Spring-Frontal Ivanpah Lake D-31-121 R6 RIVERINE 0.015967 434.7 NRPW 35.587897 -115.499004 Whisky Spring-Frontal Ivanpah Lake D-31-122 R6 RIVERINE 0.761226 473.7 NRPW 35.588212 -115.498662 Whisky Spring-Frontal Ivanpah Lake D-31-124 R6 RIVERINE 0.016298 443.7 NRPW 35.588859 -115.498140 Whisky Spring-Frontal Ivanpah Lake D-31-125 R6 RIVERINE 0.935331 452.7 NRPW 35.589091 -115.497919 Whisky Spring-Frontal Ivanpah Lake D-31-126 R6 RIVERINE 0.016716 455.1 NRPW 35.588979 -115.498021 Whisky Spring-Frontal Ivanpah Lake D-31-127 R6 RIVERINE 0.015383 418.8 NRPW 35.589898 -115.497192 Whisky Spring-Frontal Ivanpah Lake D-31-128 R6 RIVERINE 0.021895 596.1 NRPW 35.590859 -115.496233 Whisky Spring-Frontal Ivanpah Lake D-31-129 R6 RIVERINE 0.995443 667.1 NRPW 35.590534 -115.496476 Whisky Spring-Frontal Ivanpah Lake D-31-131 R6 RIVERINE 0.021763 592.5 NRPW 35.590887 -115.496012 Whisky Spring-Frontal Ivanpah Lake D-31-132 R6 RIVERINE 0.002424 66.0 NRPW 35.590959 -115.496786 Whisky Spring-Frontal Ivanpah Lake 

J:\DesertXpress\Revised JD Spreadsheets 2-2-11\GWB Formatted 02 14 11\Ivanpah-Pahrump_Valleys 110214gwb Ivanpah-Pahrump_Valley

F-I.2-78
2/14/2011 7:15 PM

Waters

_

Name

Cowardin_Code HGM_Code

Area (acres) Linear (ft)

Waters Types

Latitude (dd nad83)

Longitude (dd nad83) Local_Waterway

Exhibit B1. Study Area Field Data for Areas Potentially Subject to Corps Jurisdiction, HUC-8 Ivanpah-Pahrump Valleys, Preferred RDesertXpress Project

D-31-133 R6 RIVERINE 0.021712 591.1 NRPW 35.591072 -115.495777 Whisky Spring-Frontal Ivanpah Lake D-31-134 R6 RIVERINE 0.041357 600.5 NRPW 35.591296 -115.495554 Whisky Spring-Frontal Ivanpah Lake D-31-135 R6 RIVERINE 0.009341 254.3 NRPW 35.591151 -115.496324 Whisky Spring-Frontal Ivanpah Lake D-31-138 R6 RIVERINE 0.015416 419.7 NRPW 35.591916 -115.494816 Whisky Spring-Frontal Ivanpah Lake D-31-140 R6 RIVERINE 0.074564 406.0 NRPW 35.591736 -115.495290 Whisky Spring-Frontal Ivanpah Lake D-31-141 R6 RIVERINE 0.011607 316.0 NRPW 35.591597 -115.495688 Whisky Spring-Frontal Ivanpah Lake D-31-142 R6 RIVERINE 0.023592 642.3 NRPW 35.591562 -115.495389 Whisky Spring-Frontal Ivanpah Lake D-31-143 R6 RIVERINE 0.009366 255.0 NRPW 35.591538 -115.494802 Whisky Spring-Frontal Ivanpah Lake D-31-144 R6 RIVERINE 0.034587 502.2 NRPW 35.592483 -115.494118 Whisky Spring-Frontal Ivanpah Lake D-31-148 R6 RIVERINE 1.634986 712.2 NRPW 35.594067 -115.491587 Whisky Spring-Frontal Ivanpah Lake D-31-150 R6 RIVERINE 0.022949 624.8 NRPW 35.593739 -115.491833 Whisky Spring-Frontal Ivanpah Lake D-31-152 R6 RIVERINE 0.032500 471.9 NRPW 35.593336 -115.492778 Whisky Spring-Frontal Ivanpah Lake D-31-153 R6 RIVERINE 0.017421 474.3 NRPW 35.593594 -115.492400 Whisky Spring-Frontal Ivanpah Lake D-31-154 R6 RIVERINE 0.007611 207.2 NRPW 35.593720 -115.492224 Whisky Spring-Frontal Ivanpah Lake D-31-155 R6 RIVERINE 0.014744 401.4 NRPW 35.593938 -115.492197 Whisky Spring-Frontal Ivanpah Lake D-31-156 R6 RIVERINE 0.013095 356.5 NRPW 35.594062 -115.491334 Whisky Spring-Frontal Ivanpah Lake D-31-157 R6 RIVERINE 0.212718 926.6 NRPW 35.595005 -115.490306 Whisky Spring-Frontal Ivanpah Lake D-31-171 R6 RIVERINE 0.075815 660.5 NRPW 35.596458 -115.486967 Whisky Spring-Frontal Ivanpah Lake D-31-178 R6 RIVERINE 0.227961 827.5 NRPW 35.597033 -115.485531 Whisky Spring-Frontal Ivanpah Lake D-31-186 R6 RIVERINE 0.117810 855.3 NRPW 35.598129 -115.482118 Whisky Spring-Frontal Ivanpah Lake D-31-191 R6 RIVERINE 0.015728 428.2 NRPW 35.572448 -115.505344 Whisky Spring-Frontal Ivanpah Lake D-31-193 R6 RIVERINE 0.016485 448.8 NRPW 35.590268 -115.496924 Whisky Spring-Frontal Ivanpah Lake D-31-196 R6 RIVERINE 0.024217 659.3 NRPW 35.599228 -115.476617 Whisky Spring-Frontal Ivanpah Lake D-31-200 R6 RIVERINE 0.027071 737.0 NRPW 35.599434 -115.475526 Whisky Spring-Frontal Ivanpah Lake D-31-201 R6 RIVERINE 0.024287 661.2 NRPW 35.599310 -115.475938 Whisky Spring-Frontal Ivanpah Lake D-31-202 R6 RIVERINE 0.023052 627.6 NRPW 35.599287 -115.476370 Whisky Spring-Frontal Ivanpah Lake D-31-206 R6 RIVERINE 0.173416 1259.0 NRPW 35.599677 -115.471960 Whisky Spring-Frontal Ivanpah Lake D-31-214 R6 RIVERINE 0.089706 976.9 NRPW 35.599908 -115.468676 Whisky Spring-Frontal Ivanpah Lake D-31-217 R6 RIVERINE 0.332433 1810.1 NRPW 35.600410 -115.466294 Whisky Spring-Frontal Ivanpah Lake D-31-219 R6 RIVERINE 0.622360 2711.0 NRPW 35.600710 -115.463904 Whisky Spring-Frontal Ivanpah Lake D-31-232 R6 RIVERINE 0.235234 853.9 NRPW 35.602076 -115.455944 Whisky Spring-Frontal Ivanpah Lake D-31-241 R6 RIVERINE 0.283099 2055.3 NRPW 35.602671 -115.452788 Whisky Spring-Frontal Ivanpah Lake D-31-244 R6 RIVERINE 0.172975 627.9 NRPW 35.602152 -115.455511 Whisky Spring-Frontal Ivanpah Lake D-31-250 R6 RIVERINE 0.500964 1091.1 NRPW 35.602155 -115.453218 Whisky Spring-Frontal Ivanpah Lake D-31-312 R6 RIVERINE 0.132287 960.4 NRPW 35.603114 -115.447914 Whisky Spring-Frontal Ivanpah Lake D-31-313 R6 RIVERINE 0.027265 742.3 NRPW 35.603238 -115.447093 Whisky Spring-Frontal Ivanpah Lake D-31-314 R6 RIVERINE 0.326033 946.8 NRPW 35.603110 -115.447582 Whisky Spring-Frontal Ivanpah Lake D-31-315 R6 RIVERINE 0.522727 227.7 NRPW 35.603580 -115.448128 Whisky Spring-Frontal Ivanpah Lake 

J:\DesertXpress\Revised JD Spreadsheets 2-2-11\GWB Formatted 02 14 11\Ivanpah-Pahrump_Valleys 110214gwb Ivanpah-Pahrump_Valley

F-I.2-79
2/14/2011 7:15 PM

Waters

_

Name

Cowardin_Code HGM_Code

Area (acres) Linear (ft)

Waters Types

Latitude (dd nad83)

Longitude (dd nad83) Local_Waterway

Exhibit B1. Study Area Field Data for Areas Potentially Subject to Corps Jurisdiction, HUC-8 Ivanpah-Pahrump Valleys, Preferred RDesertXpress Project

D-31-321 R6 RIVERINE 0.145289 1054.8 NRPW 35.603327 -115.445137 Whisky Spring-Frontal Ivanpah Lake D-31-325 R6 RIVERINE 0.030294 329.9 NRPW 35.603239 -115.445991 Whisky Spring-Frontal Ivanpah Lake D-31-333 R6 RIVERINE 0.071930 1958.3 NRPW 35.603973 -115.443007 Whisky Spring-Frontal Ivanpah Lake D-31-347 R6 RIVERINE 0.028331 771.3 NRPW 35.604189 -115.440895 Whisky Spring-Frontal Ivanpah Lake D-31-350 R6 RIVERINE 5.089509 943.4 NRPW 35.604280 -115.439148 Whisky Spring-Frontal Ivanpah Lake D-31-359 R6 RIVERINE 2.347303 435.1 NRPW 35.604662 -115.438035 Whisky Spring-Frontal Ivanpah Lake D-31-363 R6 RIVERINE 3.072397 1394.1 NRPW 35.605382 -115.434362 Whisky Spring-Frontal Ivanpah Lake D-31-365 R6 RIVERINE 0.687603 312.0 NRPW 35.605138 -115.434855 Whisky Spring-Frontal Ivanpah Lake D-31-369 R6 RIVERINE 1.300000 629.2 NRPW 35.605266 -115.430291 Whisky Spring-Frontal Ivanpah Lake D-31-370 R6 RIVERINE 0.017792 484.4 NRPW 35.605553 -115.430023 Whisky Spring-Frontal Ivanpah Lake D-31-371 R6 RIVERINE 0.040900 445.4 NRPW 35.605608 -115.429268 Whisky Spring-Frontal Ivanpah Lake D-31-373 R6 RIVERINE 0.028599 778.6 NRPW 35.605559 -115.431512 Whisky Spring-Frontal Ivanpah Lake D-31-375 R6 RIVERINE 0.004852 132.1 NRPW 35.605699 -115.431751 Whisky Spring-Frontal Ivanpah Lake D-31-376 R6 RIVERINE 1.056818 511.5 NRPW 35.605465 -115.431043 Whisky Spring-Frontal Ivanpah Lake D-31-378 R6 RIVERINE 0.015331 417.4 NRPW 35.605832 -115.427947 Whisky Spring-Frontal Ivanpah Lake D-31-379 R6 RIVERINE 0.014913 406.0 NRPW 35.605808 -115.428008 Whisky Spring-Frontal Ivanpah Lake D-31-380 R6 RIVERINE 0.015783 429.7 NRPW 35.606016 -115.426744 Whisky Spring-Frontal Ivanpah Lake D-31-381 R6 RIVERINE 0.015196 413.7 NRPW 35.605987 -115.426640 Whisky Spring-Frontal Ivanpah Lake D-31-382 R6 RIVERINE 0.015089 410.8 NRPW 35.606140 -115.425565 Whisky Spring-Frontal Ivanpah Lake D-31-383 R6 RIVERINE 0.017142 466.7 NRPW 35.606183 -115.425186 Whisky Spring-Frontal Ivanpah Lake D-31-384 R6 RIVERINE 0.017543 477.6 NRPW 35.606307 -115.424275 Whisky Spring-Frontal Ivanpah Lake D-31-385 R6 RIVERINE 0.004158 113.2 NRPW 35.606689 -115.424443 Whisky Spring-Frontal Ivanpah Lake D-31-386 R6 RIVERINE 0.016073 437.6 NRPW 35.606447 -115.423057 Whisky Spring-Frontal Ivanpah Lake D-31-387 R6 RIVERINE 0.013039 355.0 NRPW 35.606571 -115.422808 Whisky Spring-Frontal Ivanpah Lake D-31-388 R6 RIVERINE 0.015074 410.4 NRPW 35.606604 -115.422097 Whisky Spring-Frontal Ivanpah Lake D-31-389 R6 RIVERINE 0.010938 297.8 NRPW 35.606740 -115.422208 Whisky Spring-Frontal Ivanpah Lake D-31-390 R6 RIVERINE 0.014659 399.1 NRPW 35.606648 -115.421558 Whisky Spring-Frontal Ivanpah Lake D-31-391 R6 RIVERINE 0.016338 444.8 NRPW 35.606739 -115.421112 Whisky Spring-Frontal Ivanpah Lake D-31-392 R6 RIVERINE 0.080220 436.8 NRPW 35.606896 -115.420000 Whisky Spring-Frontal Ivanpah Lake D-31-393 R6 RIVERINE 0.015519 422.5 NRPW 35.607062 -115.418676 Whisky Spring-Frontal Ivanpah Lake D-31-394 R6 RIVERINE 0.014461 393.7 NRPW 35.607100 -115.418232 Whisky Spring-Frontal Ivanpah Lake D-31-395 R6 RIVERINE 0.009054 246.5 NRPW 35.606859 -115.418380 Whisky Spring-Frontal Ivanpah Lake D-31-396 R6 RIVERINE 0.086465 470.8 NRPW 35.607088 -115.417852 Whisky Spring-Frontal Ivanpah Lake D-31-399 R6 RIVERINE 0.017469 475.6 NRPW 35.607561 -115.415678 Whisky Spring-Frontal Ivanpah Lake D-31-400 R6 RIVERINE 0.009087 247.4 NRPW 35.607720 -115.415467 Whisky Spring-Frontal Ivanpah Lake D-31-401 R6 RIVERINE 0.009517 259.1 NRPW 35.607763 -115.415664 Whisky Spring-Frontal Ivanpah Lake D-31-402 R6 RIVERINE 0.015133 412.0 NRPW 35.607674 -115.414203 Whisky Spring-Frontal Ivanpah Lake D-31-403 R6 RIVERINE 0.015456 420.8 NRPW 35.607672 -115.414069 Whisky Spring-Frontal Ivanpah Lake 

J:\DesertXpress\Revised JD Spreadsheets 2-2-11\GWB Formatted 02 14 11\Ivanpah-Pahrump_Valleys 110214gwb Ivanpah-Pahrump_Valley

F-I.2-80
2/14/2011 7:15 PM

Waters

_

Name

Cowardin_Code HGM_Code

Area (acres) Linear (ft)

Waters Types

Latitude (dd nad83)

Longitude (dd nad83) Local_Waterway

Exhibit B1. Study Area Field Data for Areas Potentially Subject to Corps Jurisdiction, HUC-8 Ivanpah-Pahrump Valleys, Preferred RDesertXpress Project

D-31-404 R6 RIVERINE 0.016040 436.7 NRPW 35.607725 -115.413884 Whisky Spring-Frontal Ivanpah Lake D-31-405 R6 RIVERINE 0.004926 134.1 NRPW 35.608051 -115.414285 Whisky Spring-Frontal Ivanpah Lake D-31-406 R6 RIVERINE 0.015578 424.1 NRPW 35.607877 -115.412810 Whisky Spring-Frontal Ivanpah Lake D-31-407 R6 RIVERINE 0.016312 444.1 NRPW 35.608144 -115.411586 Whisky Spring-Frontal Ivanpah Lake D-31-408 R6 RIVERINE 0.014200 386.6 NRPW 35.608276 -115.411208 Whisky Spring-Frontal Ivanpah Lake D-31-409 R6 RIVERINE 0.006307 171.7 NRPW 35.607959 -115.411093 Whisky Spring-Frontal Ivanpah Lake D-31-410 R6 RIVERINE 0.014094 383.7 NRPW 35.608370 -115.410676 Whisky Spring-Frontal Ivanpah Lake D-31-411 R6 RIVERINE 0.000353 9.6 NRPW 35.608053 -115.410181 Whisky Spring-Frontal Ivanpah Lake D-31-412 R6 RIVERINE 0.004242 115.5 NRPW 35.608540 -115.411365 Whisky Spring-Frontal Ivanpah Lake D-31-413 R6 RIVERINE 0.006417 174.7 NRPW 35.609059 -115.408638 Whisky Spring-Frontal Ivanpah Lake D-31-414 R6 RIVERINE 0.004580 399.0 NRPW 35.545059 -115.508601 Whisky Spring-Frontal Ivanpah Lake D-31-415 R6 RIVERINE 0.502562 405.4 NRPW 35.546159 -115.508477 Whisky Spring-Frontal Ivanpah Lake D-31-416 R6 RIVERINE 0.031990 464.5 NRPW 35.550995 -115.507915 Whisky Spring-Frontal Ivanpah Lake D-31-417 R6 RIVERINE 0.813017 393.5 NRPW 35.553765 -115.507585 Whisky Spring-Frontal Ivanpah Lake D-31-419 R6 RIVERINE 0.040088 406.1 NRPW 35.555100 -115.507427 Whisky Spring-Frontal Ivanpah Lake D-31-421 R6 RIVERINE 0.868182 420.2 NRPW 35.565872 -115.506205 Whisky Spring-Frontal Ivanpah Lake D-31-422 R6 RIVERINE 0.040779 413.1 NRPW 35.575737 -115.504940 Whisky Spring-Frontal Ivanpah Lake D-31-424 R6 RIVERINE 0.038400 389.0 NRPW 35.580656 -115.503545 Whisky Spring-Frontal Ivanpah Lake D-31-426 R6 RIVERINE 0.117883 513.5 NRPW 35.586520 -115.500302 Whisky Spring-Frontal Ivanpah Lake D-31-427 R6 RIVERINE 0.014733 401.1 NRPW 35.582552 -115.502743 Whisky Spring-Frontal Ivanpah Lake D-31-428 R6 RIVERINE 0.020327 553.4 NRPW 35.584442 -115.501721 Whisky Spring-Frontal Ivanpah Lake D-31-429 R6 RIVERINE 0.279339 405.6 NRPW 35.585242 -115.501116 Whisky Spring-Frontal Ivanpah Lake D-31-430 R6 RIVERINE 0.031864 867.5 NRPW 35.599666 -115.474430 Whisky Spring-Frontal Ivanpah Lake D-31-431 R6 RIVERINE 0.024937 678.9 NRPW 35.601916 -115.456721 Whisky Spring-Frontal Ivanpah Lake D-31-433 R6 RIVERINE 0.023857 649.5 NRPW 35.602921 -115.449267 Whisky Spring-Frontal Ivanpah Lake D-31-434 R6 RIVERINE 0.137549 1393.4 NRPW 35.604552 -115.437755 Whisky Spring-Frontal Ivanpah Lake D-31-435 R6 RIVERINE 0.157484 857.5 NRPW 35.602042 -115.452457 Whisky Spring-Frontal Ivanpah Lake D-31-436 R6 RIVERINE 0.821304 1788.8 NRPW 35.602758 -115.452720 Whisky Spring-Frontal Ivanpah Lake D-31-437 R6 RIVERINE 0.017866 486.4 NRPW 35.551751 -115.507883 Whisky Spring-Frontal Ivanpah Lake D-31-438 R6 RIVERINE 0.314738 457.0 NRPW 35.550706 -115.507922 Whisky Spring-Frontal Ivanpah Lake D-31-439 R6 RIVERINE 0.007129 194.1 NRPW 35.609016 -115.408864 Whisky Spring-Frontal Ivanpah Lake D-31-440 R6 RIVERINE 0.008720 237.4 NRPW 35.608917 -115.409003 Whisky Spring-Frontal Ivanpah Lake D-31-441 R6 RIVERINE 0.009818 267.3 NRPW 35.608761 -115.409461 Whisky Spring-Frontal Ivanpah Lake D-31-442 R6 RIVERINE 0.001139 31.0 NRPW 35.609891 -115.406728 Whisky Spring-Frontal Ivanpah Lake D-31-443 R6 RIVERINE 0.126777 920.4 NRPW 35.601616 -115.459635 Whisky Spring-Frontal Ivanpah Lake D-31-444 R6 RIVERINE 0.039995 871.1 NRPW 35.598223 -115.481221 Whisky Spring-Frontal Ivanpah Lake D-31-445 R6 RIVERINE 0.065767 716.2 NRPW 35.598765 -115.479320 Whisky Spring-Frontal Ivanpah Lake D-31-446 R6 RIVERINE 0.023434 510.4 NRPW 35.589442 -115.497511 Whisky Spring-Frontal Ivanpah Lake 

J:\DesertXpress\Revised JD Spreadsheets 2-2-11\GWB Formatted 02 14 11\Ivanpah-Pahrump_Valleys 110214gwb Ivanpah-Pahrump_Valley

F-I.2-81
2/14/2011 7:15 PM

Waters

_

Name

Cowardin_Code HGM_Code

Area (acres) Linear (ft)

Waters Types

Latitude (dd nad83)

Longitude (dd nad83) Local_Waterway

Exhibit B1. Study Area Field Data for Areas Potentially Subject to Corps Jurisdiction, HUC-8 Ivanpah-Pahrump Valleys, Preferred RDesertXpress Project

D-31-447 R6 RIVERINE 0.018884 411.3 NRPW 35.583072 -115.502514 Whisky Spring-Frontal Ivanpah Lake D-31-448 R6 RIVERINE 0.020372 443.7 NRPW 35.549828 -115.508052 Whisky Spring-Frontal Ivanpah Lake D-31-449 R6 RIVERINE 0.059270 430.3 NRPW 35.549129 -115.508109 Whisky Spring-Frontal Ivanpah Lake D-31-450 R6 RIVERINE 0.019151 417.1 NRPW 35.547691 -115.508322 Whisky Spring-Frontal Ivanpah Lake D-31-451 R6 RIVERINE 0.080129 436.3 NRPW 35.546664 -115.508445 Whisky Spring-Frontal Ivanpah Lake D-31-452 R6 RIVERINE 0.005072 157.8 NRPW 35.613675 -115.397904 Whisky Spring-Frontal Ivanpah Lake D-31-453 R6 RIVERINE 0.011146 346.8 NRPW 35.613572 -115.397759 Whisky Spring-Frontal Ivanpah Lake D-31-454 R6 RIVERINE 0.013508 420.3 NRPW 35.613774 -115.397454 Whisky Spring-Frontal Ivanpah Lake D-31-455 R6 RIVERINE 0.006299 196.0 NRPW 35.614049 -115.398075 Whisky Spring-Frontal Ivanpah Lake D-31-456 R6 RIVERINE 0.002594 80.7 NRPW 35.614390 -115.397679 Whisky Spring-Frontal Ivanpah Lake D-31-457 R6 RIVERINE 0.006058 188.5 NRPW 35.614284 -115.397666 Whisky Spring-Frontal Ivanpah Lake D-31-458 R6 RIVERINE 0.006936 215.8 NRPW 35.614170 -115.397634 Whisky Spring-Frontal Ivanpah Lake D-31-459 R6 RIVERINE 0.002854 88.8 NRPW 35.613851 -115.397892 Whisky Spring-Frontal Ivanpah Lake D-31-460 R6 RIVERINE 0.002722 84.7 NRPW 35.613785 -115.397904 Whisky Spring-Frontal Ivanpah Lake D-31-461 R6 RIVERINE 0.003098 96.4 NRPW 35.614109 -115.397858 Whisky Spring-Frontal Ivanpah Lake D-31-462 R6 RIVERINE 0.004792 417.5 NRPW 35.544638 -115.508626 Whisky Spring-Frontal Ivanpah Lake D-32-1 R6 RIVERINE 0.016336 355.8 NRPW 35.615488 -115.394535 Porter Wash-Frontal Ivanpah Lake D-32-2 R6 RIVERINE 0.001883 58.6 NRPW 35.616129 -115.393801 Porter Wash-Frontal Ivanpah Lake D-32-5 R6 RIVERINE 0.005483 170.6 NRPW 35.618379 -115.391743 Porter Wash-Frontal Ivanpah Lake D-32-6 R6 RIVERINE 0.009841 306.2 NRPW 35.618542 -115.391457 Porter Wash-Frontal Ivanpah Lake D-32-7 R6 RIVERINE 0.012296 82.4 NRPW 35.619980 -115.391589 Porter Wash-Frontal Ivanpah Lake D-32-8 R6 RIVERINE 0.043169 289.3 NRPW 35.620134 -115.391296 Porter Wash-Frontal Ivanpah Lake D-32-11 R6 RIVERINE 0.014813 460.9 NRPW 35.621909 -115.389492 Porter Wash-Frontal Ivanpah Lake D-32-13 R6 RIVERINE 0.010477 380.3 NRPW 35.625101 -115.387671 Porter Wash-Frontal Ivanpah Lake D-32-14 R6 RIVERINE 0.004013 218.5 NRPW 35.625054 -115.387339 Porter Wash-Frontal Ivanpah Lake D-32-15 R6 RIVERINE 0.003295 179.4 NRPW 35.625044 -115.387850 Porter Wash-Frontal Ivanpah Lake D-32-16 R6 RIVERINE 0.002937 159.9 NRPW 35.625009 -115.387935 Porter Wash-Frontal Ivanpah Lake D-32-17 R6 RIVERINE 0.006500 353.9 NRPW 35.624950 -115.387683 Porter Wash-Frontal Ivanpah Lake D-32-18 R6 RIVERINE 0.007742 240.9 NRPW 35.624838 -115.387610 Porter Wash-Frontal Ivanpah Lake D-32-19 R6 RIVERINE 0.011271 350.7 NRPW 35.626189 -115.387494 Porter Wash-Frontal Ivanpah Lake D-32-20 R6 RIVERINE 0.011943 371.6 NRPW 35.626005 -115.387591 Porter Wash-Frontal Ivanpah Lake D-32-22 R6 RIVERINE 0.013855 431.1 NRPW 35.626802 -115.387060 Porter Wash-Frontal Ivanpah Lake D-32-23 R6 RIVERINE 0.009729 302.7 NRPW 35.626701 -115.387285 Porter Wash-Frontal Ivanpah Lake D-32-25 R6 RIVERINE 0.011831 368.1 NRPW 35.629197 -115.386397 Porter Wash-Frontal Ivanpah Lake D-32-26 R6 RIVERINE 0.010304 320.6 NRPW 35.629326 -115.386445 Porter Wash-Frontal Ivanpah Lake D-32-27 R6 RIVERINE 0.011230 349.4 NRPW 35.629476 -115.386330 Porter Wash-Frontal Ivanpah Lake D-32-28 R6 RIVERINE 0.007852 244.3 NRPW 35.629690 -115.386590 Porter Wash-Frontal Ivanpah Lake D-32-29 R6 RIVERINE 0.008842 275.1 NRPW 35.630529 -115.386269 Porter Wash-Frontal Ivanpah Lake 

J:\DesertXpress\Revised JD Spreadsheets 2-2-11\GWB Formatted 02 14 11\Ivanpah-Pahrump_Valleys 110214gwb Ivanpah-Pahrump_Valley

F-I.2-82
2/14/2011 7:15 PM

Waters

_

Name

Cowardin_Code HGM_Code

Area (acres) Linear (ft)

Waters Types

Latitude (dd nad83)

Longitude (dd nad83) Local_Waterway

Exhibit B1. Study Area Field Data for Areas Potentially Subject to Corps Jurisdiction, HUC-8 Ivanpah-Pahrump Valleys, Preferred RDesertXpress Project

D-32-30 R6 RIVERINE 0.001980 61.6 NRPW 35.630543 -115.386581 Porter Wash-Frontal Ivanpah Lake D-32-31 R6 RIVERINE 0.003085 96.0 NRPW 35.630377 -115.386557 Porter Wash-Frontal Ivanpah Lake D-32-32 R6 RIVERINE 0.002227 69.3 NRPW 35.630334 -115.386665 Porter Wash-Frontal Ivanpah Lake D-32-33 R6 RIVERINE 0.009533 296.6 NRPW 35.631936 -115.386000 Porter Wash-Frontal Ivanpah Lake 

D-32-34 R6 RIVERINE 0.007125 221.7 NRPW 35.632100 -115.385782 Porter Wash-Frontal Ivanpah Lake 

D-32-35 R6 RIVERINE 0.006698 208.4 NRPW 35.632000 -115.386120 Porter Wash-Frontal Ivanpah Lake 

D-32-36 R6 RIVERINE 0.008729 271.6 NRPW 35.632402 -115.385909 Porter Wash-Frontal Ivanpah Lake 

D-32-37 R6 RIVERINE 0.005187 161.4 NRPW 35.632505 -115.386054 Porter Wash-Frontal Ivanpah Lake 

D-32-38 R6 RIVERINE 0.002848 88.6 NRPW 35.632474 -115.386195 Porter Wash-Frontal Ivanpah Lake D-32-39 R6 RIVERINE 0.010429 324.5 NRPW 35.632821 -115.385733 Porter Wash-Frontal Ivanpah Lake 

D-32-40 R6 RIVERINE 0.004480 139.4 NRPW 35.632917 -115.386018 Porter Wash-Frontal Ivanpah Lake 

D-32-41 R6 RIVERINE 0.008315 258.7 NRPW 35.633013 -115.385808 Porter Wash-Frontal Ivanpah Lake 

D-32-42 R6 RIVERINE 0.007235 225.1 NRPW 35.634312 -115.385744 Porter Wash-Frontal Ivanpah Lake 

D-32-44 R6 RIVERINE 0.008687 270.3 NRPW 35.634897 -115.385475 Porter Wash-Frontal Ivanpah Lake 

D-32-45 R6 RIVERINE 0.009684 301.3 NRPW 35.635163 -115.385392 Porter Wash-Frontal Ivanpah Lake 

D-32-46 R6 RIVERINE 0.008128 252.9 NRPW 35.635234 -115.385471 Porter Wash-Frontal Ivanpah Lake 

D-32-47 R6 RIVERINE 0.007848 244.2 NRPW 35.635665 -115.385400 Porter Wash-Frontal Ivanpah Lake 

D-32-48 R6 RIVERINE 0.008996 279.9 NRPW 35.635586 -115.385467 Porter Wash-Frontal Ivanpah Lake 

D-32-49 R6 RIVERINE 0.007264 226.0 NRPW 35.636435 -115.385277 Porter Wash-Frontal Ivanpah Lake 

D-32-50 R6 RIVERINE 0.007511 233.7 NRPW 35.636725 -115.385232 Porter Wash-Frontal Ivanpah Lake D-32-51 R6 RIVERINE 0.005557 172.9 NRPW 35.636669 -115.385349 Porter Wash-Frontal Ivanpah Lake 

D-32-53 R6 RIVERINE 0.005438 169.2 NRPW 35.637159 -115.385237 Porter Wash-Frontal Ivanpah Lake 

D-32-54 R6 RIVERINE 0.004223 131.4 NRPW 35.637071 -115.385325 Porter Wash-Frontal Ivanpah Lake 

D-32-55 R6 RIVERINE 0.003021 94.0 NRPW 35.637128 -115.385384 Porter Wash-Frontal Ivanpah Lake D-32-56 R6 RIVERINE 0.007755 241.3 NRPW 35.637778 -115.385032 Porter Wash-Frontal Ivanpah Lake 

D-32-57 R6 RIVERINE 0.006560 204.1 NRPW 35.637856 -115.385144 Porter Wash-Frontal Ivanpah Lake 

D-32-58 R6 RIVERINE 0.007758 241.4 NRPW 35.638089 -115.384984 Porter Wash-Frontal Ivanpah Lake 

D-32-60 R6 RIVERINE 0.007421 230.9 NRPW 35.638159 -115.384977 Porter Wash-Frontal Ivanpah Lake 

D-32-61 R6 RIVERINE 0.001668 51.9 NRPW 35.638242 -115.385275 Porter Wash-Frontal Ivanpah Lake D-32-65 R6 RIVERINE 0.009096 283.0 NRPW 35.638758 -115.384823 Porter Wash-Frontal Ivanpah Lake 

D-32-66 R6 RIVERINE 0.007797 242.6 NRPW 35.638840 -115.384856 Porter Wash-Frontal Ivanpah Lake 

D-32-67 R6 RIVERINE 0.001610 50.1 NRPW 35.638821 -115.385171 Porter Wash-Frontal Ivanpah Lake D-32-68 R6 RIVERINE 0.004541 141.3 NRPW 35.638756 -115.385027 Porter Wash-Frontal Ivanpah Lake 

D-32-69 R6 RIVERINE 0.007820 243.3 NRPW 35.638525 -115.384850 Porter Wash-Frontal Ivanpah Lake 

D-32-70 R6 RIVERINE 0.002446 76.1 NRPW 35.638577 -115.385174 Porter Wash-Frontal Ivanpah Lake D-32-72 R6 RIVERINE 0.008376 260.6 NRPW 35.639215 -115.384756 Porter Wash-Frontal Ivanpah Lake 

D-32-73 R6 RIVERINE 0.005573 173.4 NRPW 35.639050 -115.384957 Porter Wash-Frontal Ivanpah Lake 

D-32-74 R6 RIVERINE 0.007418 230.8 NRPW 35.639871 -115.384718 Porter Wash-Frontal Ivanpah Lake 

J:\DesertXpress\Revised JD Spreadsheets 2-2-11\GWB Formatted 02 14 11\Ivanpah-Pahrump_Valleys 110214gwb Ivanpah-Pahrump_Valley

F-I.2-83
2/14/2011 7:15 PM

Waters

_

Name

Cowardin_Code HGM_Code

Area (acres) Linear (ft)

Waters Types

Latitude (dd nad83)

Longitude (dd nad83) Local_Waterway

Exhibit B1. Study Area Field Data for Areas Potentially Subject to Corps Jurisdiction, HUC-8 Ivanpah-Pahrump Valleys, Preferred RDesertXpress Project

D-32-75 R6 RIVERINE 0.009295 289.2 NRPW 35.639986 -115.384615 Porter Wash-Frontal Ivanpah Lake 

D-32-76 R6 RIVERINE 0.004348 135.3 NRPW 35.640068 -115.384827 Porter Wash-Frontal Ivanpah Lake 

D-32-77 R6 RIVERINE 0.005837 181.6 NRPW 35.640252 -115.384719 Porter Wash-Frontal Ivanpah Lake 

D-32-78 R6 RIVERINE 0.008941 278.2 NRPW 35.640088 -115.384599 Porter Wash-Frontal Ivanpah Lake 

D-32-79 R6 RIVERINE 0.008874 276.1 NRPW 35.640541 -115.384520 Porter Wash-Frontal Ivanpah Lake 

D-32-80 R6 RIVERINE 0.008408 261.6 NRPW 35.641222 -115.384413 Porter Wash-Frontal Ivanpah Lake 

D-32-82 R6 RIVERINE 0.004895 152.3 NRPW 35.641235 -115.384592 Porter Wash-Frontal Ivanpah Lake 

D-32-84 R6 RIVERINE 0.011815 367.6 NRPW 35.641824 -115.384188 Porter Wash-Frontal Ivanpah Lake 

D-32-85 R6 RIVERINE 0.008739 271.9 NRPW 35.642081 -115.384252 Porter Wash-Frontal Ivanpah Lake 

D-32-86 R6 RIVERINE 0.002928 91.1 NRPW 35.641895 -115.384585 Porter Wash-Frontal Ivanpah Lake D-32-87 R6 RIVERINE 0.008530 265.4 NRPW 35.642666 -115.384185 Porter Wash-Frontal Ivanpah Lake 

D-32-88 R6 RIVERINE 0.005056 157.3 NRPW 35.642541 -115.384259 Porter Wash-Frontal Ivanpah Lake 

D-32-89 R6 RIVERINE 0.008449 262.9 NRPW 35.642771 -115.384142 Porter Wash-Frontal Ivanpah Lake 

D-32-91 R6 RIVERINE 0.014821 339.8 NRPW 35.643672 -115.383889 Porter Wash-Frontal Ivanpah Lake 

D-32-92 R6 RIVERINE 0.004384 136.4 NRPW 35.643771 -115.384181 Porter Wash-Frontal Ivanpah Lake 

D-32-93 R6 RIVERINE 0.002504 77.9 NRPW 35.643689 -115.384282 Porter Wash-Frontal Ivanpah Lake D-32-94 R6 RIVERINE 0.002263 70.4 NRPW 35.643661 -115.384299 Porter Wash-Frontal Ivanpah Lake D-32-95 R6 RIVERINE 0.008466 263.4 NRPW 35.644139 -115.383876 Porter Wash-Frontal Ivanpah Lake 

D-32-96 R6 RIVERINE 0.003127 97.3 NRPW 35.644258 -115.384147 Porter Wash-Frontal Ivanpah Lake D-32-97 R6 RIVERINE 0.007241 225.3 NRPW 35.644513 -115.383876 Porter Wash-Frontal Ivanpah Lake D-32-98 R6 RIVERINE 0.007074 220.1 NRPW 35.644906 -115.383789 Porter Wash-Frontal Ivanpah Lake 

D-32-99 R6 RIVERINE 0.006582 204.8 NRPW 35.646192 -115.383496 Porter Wash-Frontal Ivanpah Lake 

D-32-100 R6 RIVERINE 0.006457 200.9 NRPW 35.646930 -115.383323 Porter Wash-Frontal Ivanpah Lake D-32-101 R6 RIVERINE 0.005901 183.6 NRPW 35.647146 -115.383258 Porter Wash-Frontal Ivanpah Lake D-32-102 R6 RIVERINE 0.005399 168.0 NRPW 35.647395 -115.383210 Porter Wash-Frontal Ivanpah Lake D-32-116 R6 RIVERINE 0.012946 402.8 NRPW 35.626604 -115.387130 Porter Wash-Frontal Ivanpah Lake D-32-120 R6 RIVERINE 0.001578 49.1 NRPW 35.640635 -115.384858 Porter Wash-Frontal Ivanpah Lake 

D-32-121 R6 RIVERINE 0.004281 133.2 NRPW 35.640664 -115.384742 Porter Wash-Frontal Ivanpah Lake D-32-123 R6 RIVERINE 0.006669 207.5 NRPW 35.641940 -115.384290 Porter Wash-Frontal Ivanpah Lake D-32-125 R6 RIVERINE 0.011281 351.0 NRPW 35.645789 -115.383424 Porter Wash-Frontal Ivanpah Lake D-32-136 R6 RIVERINE 0.003465 107.8 NRPW 35.716083 -115.363776 Porter Wash-Frontal Ivanpah Lake D-32-137 R6 RIVERINE 0.003680 114.5 NRPW 35.716275 -115.364187 Porter Wash-Frontal Ivanpah Lake D-32-139 R6 RIVERINE 0.006471 104.4 NRPW 35.719925 -115.362388 Porter Wash-Frontal Ivanpah Lake D-32-140 R6 RIVERINE 0.016184 261.1 NRPW 35.720396 -115.362778 Porter Wash-Frontal Ivanpah Lake D-32-142 R6 RIVERINE 0.031799 213.1 NRPW 35.725743 -115.360838 Porter Wash-Frontal Ivanpah Lake D-32-143 R6 RIVERINE 0.020518 137.5 NRPW 35.725292 -115.360457 Porter Wash-Frontal Ivanpah Lake D-32-146 R6 RIVERINE 0.012325 447.4 NRPW 35.734768 -115.357531 Porter Wash-Frontal Ivanpah Lake D-32-147 R6 RIVERINE 0.013573 422.3 NRPW 35.621887 -115.389555 Porter Wash-Frontal Ivanpah Lake 

J:\DesertXpress\Revised JD Spreadsheets 2-2-11\GWB Formatted 02 14 11\Ivanpah-Pahrump_Valleys 110214gwb Ivanpah-Pahrump_Valley

F-I.2-84
2/14/2011 7:15 PM

Waters

_

Name

Cowardin_Code HGM_Code

Area (acres) Linear (ft)

Waters Types

Latitude (dd nad83)

Longitude (dd nad83) Local_Waterway

Exhibit B1. Study Area Field Data for Areas Potentially Subject to Corps Jurisdiction, HUC-8 Ivanpah-Pahrump Valleys, Preferred RDesertXpress Project

D-32-148 R6 RIVERINE 0.044573 647.2 NRPW 35.621454 -115.390122 Porter Wash-Frontal Ivanpah Lake D-32-149 R6 RIVERINE 0.003709 115.4 NRPW 35.630251 -115.386546 Porter Wash-Frontal Ivanpah Lake D-32-152 R6 RIVERINE 0.004426 137.7 NRPW 35.638468 -115.385087 Porter Wash-Frontal Ivanpah Lake D-32-153 R6 RIVERINE 0.010551 328.3 NRPW 35.637469 -115.384933 Porter Wash-Frontal Ivanpah Lake D-32-154 R6 RIVERINE 0.009661 300.6 NRPW 35.637425 -115.384976 Porter Wash-Frontal Ivanpah Lake D-32-155 R6 RIVERINE 0.002086 64.9 NRPW 35.637043 -115.385445 Porter Wash-Frontal Ivanpah Lake 

D-32-156 R6 RIVERINE 0.007591 236.2 NRPW 35.636584 -115.385238 Porter Wash-Frontal Ivanpah Lake D-32-157 R6 RIVERINE 0.011027 343.1 NRPW 35.634541 -115.385435 Porter Wash-Frontal Ivanpah Lake D-32-158 R6 RIVERINE 0.003629 112.9 NRPW 35.632077 -115.386204 Porter Wash-Frontal Ivanpah Lake D-32-159 R6 RIVERINE 0.009182 285.7 NRPW 35.631707 -115.386055 Porter Wash-Frontal Ivanpah Lake D-32-160 R6 RIVERINE 0.002764 86.0 NRPW 35.629396 -115.386749 Porter Wash-Frontal Ivanpah Lake 

D-32-161 R6 RIVERINE 0.011567 359.9 NRPW 35.621594 -115.389889 Porter Wash-Frontal Ivanpah Lake D-32-162 R6 RIVERINE 0.010551 328.3 NRPW 35.618004 -115.392448 Porter Wash-Frontal Ivanpah Lake D-32-163 R6 RIVERINE 0.008263 257.1 NRPW 35.617670 -115.392448 Porter Wash-Frontal Ivanpah Lake D-32-164 R6 RIVERINE 0.003574 111.2 NRPW 35.617979 -115.392020 Porter Wash-Frontal Ivanpah Lake D-32-165 R6 RIVERINE 0.002134 66.4 NRPW 35.618023 -115.391921 Porter Wash-Frontal Ivanpah Lake 

D-32-166 R6 RIVERINE 0.005512 171.5 NRPW 35.616455 -115.393715 Porter Wash-Frontal Ivanpah Lake D-32-167 R6 RIVERINE 0.003124 97.2 NRPW 35.617178 -115.392791 Porter Wash-Frontal Ivanpah Lake 

D-32-168 R6 RIVERINE 0.006447 200.6 NRPW 35.616966 -115.392924 Porter Wash-Frontal Ivanpah Lake D-32-169 R6 RIVERINE 0.007029 218.7 NRPW 35.615884 -115.394643 Porter Wash-Frontal Ivanpah Lake D-32-172 R6 RIVERINE 0.007764 338.2 NRPW 35.730491 -115.358870 Porter Wash-Frontal Ivanpah Lake D-32-173 R6 RIVERINE 0.006442 280.6 NRPW 35.728915 -115.359469 Porter Wash-Frontal Ivanpah Lake D-32-174 R6 RIVERINE 0.003910 170.3 NRPW 35.725535 -115.360866 Porter Wash-Frontal Ivanpah Lake D-32-175 R6 RIVERINE 0.009798 426.8 NRPW 35.723520 -115.361623 Porter Wash-Frontal Ivanpah Lake D-32-176 R6 RIVERINE 0.008955 390.1 NRPW 35.721630 -115.362081 Porter Wash-Frontal Ivanpah Lake D-32-177 R6 RIVERINE 0.008705 379.2 NRPW 35.718163 -115.363517 Porter Wash-Frontal Ivanpah Lake D-32-178 R6 RIVERINE 0.006573 286.3 NRPW 35.711433 -115.365592 Porter Wash-Frontal Ivanpah Lake D-32-179 R6 RIVERINE 0.047397 344.1 NRPW 35.708881 -115.366448 Porter Wash-Frontal Ivanpah Lake D-32-180 R6 RIVERINE 0.015601 339.8 NRPW 35.706422 -115.367264 Porter Wash-Frontal Ivanpah Lake D-32-181 R6 RIVERINE 0.007427 323.5 NRPW 35.704457 -115.367998 Porter Wash-Frontal Ivanpah Lake D-32-182 R6 RIVERINE 0.003375 24.5 NRPW 35.652897 -115.381832 Porter Wash-Frontal Ivanpah Lake 

D-32-183 R6 RIVERINE 0.002169 31.5 NRPW 35.651369 -115.382319 Porter Wash-Frontal Ivanpah Lake 

D-32-184 R6 RIVERINE 0.002355 34.2 NRPW 35.651695 -115.382241 Porter Wash-Frontal Ivanpah Lake 

D-32-185 R6 RIVERINE 0.006701 97.3 NRPW 35.650932 -115.382330 Porter Wash-Frontal Ivanpah Lake 

D-32-186 R6 RIVERINE 0.018802 273.0 NRPW 35.648948 -115.382915 Porter Wash-Frontal Ivanpah Lake D-32-187 R6 RIVERINE 0.015709 228.1 NRPW 35.647750 -115.383213 Porter Wash-Frontal Ivanpah Lake D-32-188 R6 RIVERINE 0.004197 182.8 NRPW 35.648079 -115.383098 Porter Wash-Frontal Ivanpah Lake D-33-1 R6 RIVERINE 0.108259 280.7 NRPW 35.770669 -115.334695 Town of Jean-Frontal Ivanpah Lake 

J:\DesertXpress\Revised JD Spreadsheets 2-2-11\GWB Formatted 02 14 11\Ivanpah-Pahrump_Valleys 110214gwb Ivanpah-Pahrump_Valley

F-I.2-85
2/14/2011 7:15 PM

Waters

_

Name

Cowardin_Code HGM_Code

Area (acres) Linear (ft)

Waters Types

Latitude (dd nad83)

Longitude (dd nad83) Local_Waterway

Exhibit B1. Study Area Field Data for Areas Potentially Subject to Corps Jurisdiction, HUC-8 Ivanpah-Pahrump Valleys, Preferred RDesertXpress Project

D-33-2 R6 RIVERINE 0.044930 301.1 NRPW 35.783761 -115.325119 Town of Jean-Frontal Ivanpah Lake D-33-13 R6 RIVERINE 0.019728 452.3 NRPW 35.804225 -115.309979 Town of Jean-Frontal Ivanpah Lake D-33-14 R6 RIVERINE 0.020937 570.0 NRPW 35.805612 -115.309261 Town of Jean-Frontal Ivanpah Lake D-33-15 R6 RIVERINE 0.012533 341.2 NRPW 35.805433 -115.308924 Town of Jean-Frontal Ivanpah Lake D-33-32 R6 RIVERINE 0.010182 369.6 NRPW 35.735733 -115.356830 Town of Jean-Frontal Ivanpah Lake D-33-33 R6 RIVERINE 0.038394 257.3 NRPW 35.741257 -115.355130 Town of Jean-Frontal Ivanpah Lake D-33-38 R6 RIVERINE 0.046362 310.7 NRPW 35.755954 -115.345495 Town of Jean-Frontal Ivanpah Lake D-33-41 R6 RIVERINE 0.046646 312.6 NRPW 35.757616 -115.344299 Town of Jean-Frontal Ivanpah Lake D-33-54 R6 RIVERINE 0.025784 320.9 NRPW 35.765231 -115.338710 Town of Jean-Frontal Ivanpah Lake D-33-63 R6 RIVERINE 0.012598 457.3 NRPW 35.792512 -115.318676 Town of Jean-Frontal Ivanpah Lake D-33-64 R6 RIVERINE 0.015614 425.1 NRPW 35.794382 -115.317251 Town of Jean-Frontal Ivanpah Lake D-33-69 R6 RIVERINE 1.456612 2115.0 NRPW 35.773429 -115.332523 Town of Jean-Frontal Ivanpah Lake D-33-70 R6 RIVERINE 0.016166 352.1 NRPW 35.797049 -115.315382 Town of Jean-Frontal Ivanpah Lake D-33-150 R6 RIVERINE 0.009031 393.4 NRPW 35.753634 -115.347256 Town of Jean-Frontal Ivanpah Lake D-33-153 R6 RIVERINE 0.010220 445.2 NRPW 35.742259 -115.354495 Town of Jean-Frontal Ivanpah Lake D-33-168 R6 RIVERINE 0.026198 190.2 NRPW 35.773388 -115.332915 Town of Jean-Frontal Ivanpah Lake D-33-169 R6 RIVERINE 0.021529 312.6 NRPW 35.785445 -115.323891 Town of Jean-Frontal Ivanpah Lake D-33-170 R6 RIVERINE 0.025324 367.7 NRPW 35.787890 -115.321925 Town of Jean-Frontal Ivanpah Lake D-33-171 R6 RIVERINE 0.024056 349.3 NRPW 35.789974 -115.320513 Town of Jean-Frontal Ivanpah Lake D-33-173 R6 RIVERINE 0.017916 390.2 NRPW 35.798951 -115.313924 Town of Jean-Frontal Ivanpah Lake D-33-174 R6 RIVERINE 0.018338 399.4 NRPW 35.801904 -115.311845 Town of Jean-Frontal Ivanpah Lake D-33-175 R6 RIVERINE 0.015510 337.8 NRPW 35.808062 -115.307250 Town of Jean-Frontal Ivanpah Lake D-33-176 R6 RIVERINE 0.006423 139.9 NRPW 35.810885 -115.305453 Town of Jean-Frontal Ivanpah Lake D-33-177 R6 RIVERINE 0.027392 596.6 NRPW 35.809623 -115.306172 Town of Jean-Frontal Ivanpah Lake D-33-178 R6 RIVERINE 0.018292 398.4 NRPW 35.809135 -115.306448 Town of Jean-Frontal Ivanpah Lake D-33-179 R6 RIVERINE 0.007879 171.6 NRPW 35.812532 -115.304270 Town of Jean-Frontal Ivanpah Lake D-34-3 R6 RIVERINE 0.171967 346.8 NRPW 35.745822 -115.352857 Lookout Peak D-34-4 R6 RIVERINE 0.005475 238.5 NRPW 35.746993 -115.352289 Lookout Peak D-34-5 R6 RIVERINE 0.025393 368.7 NRPW 35.746233 -115.352643 Lookout Peak D-34-6 R6 RIVERINE 0.007307 318.3 NRPW 35.747499 -115.351701 Lookout Peak D-34-7 R6 RIVERINE 0.006899 300.5 NRPW 35.749153 -115.350539 Lookout Peak D-34-8 R6 RIVERINE 0.006123 266.7 NRPW 35.748883 -115.350575 Lookout Peak D-34-9 R6 RIVERINE 0.008907 388.0 NRPW 35.749804 -115.350115 Lookout Peak D-34-10 R6 RIVERINE 0.007156 311.7 NRPW 35.750311 -115.349647 Lookout Peak D-34-11 R6 RIVERINE 0.004658 202.9 NRPW 35.750558 -115.349651 Lookout Peak D-34-12 R6 RIVERINE 0.008338 363.2 NRPW 35.744803 -115.353429 Lookout Peak D-34-13 R6 RIVERINE 0.007867 342.7 NRPW 35.745111 -115.353341 Lookout Peak D-34-14 R6 RIVERINE 0.006031 262.7 NRPW 35.750388 -115.351637 Lookout Peak 

J:\DesertXpress\Revised JD Spreadsheets 2-2-11\GWB Formatted 02 14 11\Ivanpah-Pahrump_Valleys 110214gwb Ivanpah-Pahrump_Valley

F-I.2-86
2/14/2011 7:15 PM

Waters

_

Name

Cowardin_Code HGM_Code

Area (acres) Linear (ft)

Waters Types

Latitude (dd nad83)

Longitude (dd nad83) Local_Waterway

Exhibit B1. Study Area Field Data for Areas Potentially Subject to Corps Jurisdiction, HUC-8 Ivanpah-Pahrump Valleys, Preferred RDesertXpress Project

D-34-15 R6 RIVERINE 0.010110 293.6 NRPW 35.752096 -115.350510 Lookout Peak D-35-1 R6 RIVERINE 0.044900 300.9 NRPW 35.764636 -115.339150 Town of Goodsprings D-35-2 R6 RIVERINE 0.051242 343.4 NRPW 35.762201 -115.340943 Town of Goodsprings D-36-2 R6 RIVERINE 0.042417 302.9 NRPW 35.838167 -115.279372 160600151401-Frontal Jean Lake D-36-19 R6 RIVERINE 0.022031 369.1 NRPW 35.844314 -115.272385 160600151401-Frontal Jean Lake D-36-25 R6 RIVERINE 0.017727 297.0 NRPW 35.850130 -115.265552 160600151401-Frontal Jean Lake D-36-27 R6 RIVERINE 0.020049 335.9 NRPW 35.858925 -115.255466 160600151401-Frontal Jean Lake D-36-29 R6 RIVERINE 0.044070 314.7 NRPW 35.821040 -115.297775 160600151401-Frontal Jean Lake D-36-31 R6 RIVERINE 0.024747 414.6 NRPW 35.824426 -115.294968 160600151401-Frontal Jean Lake D-36-34 R6 RIVERINE 0.018490 298.3 NRPW 35.830376 -115.288272 160600151401-Frontal Jean Lake D-36-35 R6 RIVERINE 0.014101 245.7 NRPW 35.830310 -115.288393 160600151401-Frontal Jean Lake D-36-38 R6 RIVERINE 0.049669 360.6 NRPW 35.835818 -115.282002 160600151401-Frontal Jean Lake D-36-39 R6 RIVERINE 0.043481 310.5 NRPW 35.839586 -115.277726 160600151401-Frontal Jean Lake D-36-41 R6 RIVERINE 0.016742 280.5 NRPW 35.840721 -115.276429 160600151401-Frontal Jean Lake D-36-42 R6 RIVERINE 0.071993 514.1 NRPW 35.842447 -115.274381 160600151401-Frontal Jean Lake D-36-46 R6 RIVERINE 0.117529 538.9 NRPW 35.852267 -115.263175 160600151401-Frontal Jean Lake D-36-47 R6 RIVERINE 0.009037 151.4 NRPW 35.852231 -115.263440 160600151401-Frontal Jean Lake D-36-49 R6 RIVERINE 0.036427 610.3 NRPW 35.853593 -115.261582 160600151401-Frontal Jean Lake D-36-52 R6 RIVERINE 0.016838 282.1 NRPW 35.856602 -115.258209 160600151401-Frontal Jean Lake D-36-53 R6 RIVERINE 0.020819 348.8 NRPW 35.856869 -115.257735 160600151401-Frontal Jean Lake D-36-54 R6 RIVERINE 0.017220 288.5 NRPW 35.857923 -115.256700 160600151401-Frontal Jean Lake D-36-59 R6 RIVERINE 0.016939 283.8 NRPW 35.861154 -115.252961 160600151401-Frontal Jean Lake D-36-61 R6 RIVERINE 0.016862 282.5 NRPW 35.863305 -115.250510 160600151401-Frontal Jean Lake D-36-63 R6 RIVERINE 0.019172 321.2 NRPW 35.867434 -115.245838 160600151401-Frontal Jean Lake D-36-67 R6 RIVERINE 0.021995 368.5 NRPW 35.841563 -115.275457 160600151401-Frontal Jean Lake D-36-68 R6 RIVERINE 0.041437 295.9 NRPW 35.839749 -115.277449 160600151401-Frontal Jean Lake D-36-71 R6 RIVERINE 0.018067 302.7 NRPW 35.844743 -115.271818 160600151401-Frontal Jean Lake D-36-74 R6 RIVERINE 0.017071 286.0 NRPW 35.854948 -115.260075 160600151401-Frontal Jean Lake D-36-78 R6 RIVERINE 0.045680 326.2 NRPW 35.831369 -115.287231 160600151401-Frontal Jean Lake D-36-79 R6 RIVERINE 0.017751 309.3 NRPW 35.836172 -115.281654 160600151401-Frontal Jean Lake D-36-82 R6 RIVERINE 0.021255 356.1 NRPW 35.850836 -115.264571 160600151401-Frontal Jean Lake D-36-87 R6 RIVERINE 0.017980 391.6 NRPW 35.822747 -115.296472 160600151401-Frontal Jean Lake D-36-88 R6 RIVERINE 0.014757 321.4 NRPW 35.834627 -115.283461 160600151401-Frontal Jean Lake D-36-89 R6 RIVERINE 0.017571 382.7 NRPW 35.835047 -115.282947 160600151401-Frontal Jean Lake D-36-90 R6 RIVERINE 0.013058 284.4 NRPW 35.835298 -115.282590 160600151401-Frontal Jean Lake D-36-92 R6 RIVERINE 0.013012 283.4 NRPW 35.838803 -115.278550 160600151401-Frontal Jean Lake D-36-93 R6 RIVERINE 0.014633 318.7 NRPW 35.837107 -115.280550 160600151401-Frontal Jean Lake D-36-94 R6 RIVERINE 0.014894 324.4 NRPW 35.836422 -115.281363 160600151401-Frontal Jean Lake 

J:\DesertXpress\Revised JD Spreadsheets 2-2-11\GWB Formatted 02 14 11\Ivanpah-Pahrump_Valleys 110214gwb Ivanpah-Pahrump_Valley

F-I.2-87
2/14/2011 7:15 PM

Waters

_

Name

Cowardin_Code HGM_Code

Area (acres) Linear (ft)

Waters Types

Latitude (dd nad83)

Longitude (dd nad83) Local_Waterway

Exhibit B1. Study Area Field Data for Areas Potentially Subject to Corps Jurisdiction, HUC-8 Ivanpah-Pahrump Valleys, Preferred RDesertXpress Project

D-36-95 R6 RIVERINE 0.044848 325.6 NRPW 35.843082 -115.273772 160600151401-Frontal Jean Lake D-36-96 R6 RIVERINE 0.016157 351.9 NRPW 35.848158 -115.267685 160600151401-Frontal Jean Lake D-36-97 R6 RIVERINE 0.013719 298.8 NRPW 35.847650 -115.268386 160600151401-Frontal Jean Lake D-36-98 R6 RIVERINE 0.015790 343.9 NRPW 35.863035 -115.250722 160600151401-Frontal Jean Lake 

Totals: 44.172045 207367.4

J:\DesertXpress\Revised JD Spreadsheets 2-2-11\GWB Formatted 02 14 11\Ivanpah-Pahrump_Valleys 110214gwb Ivanpah-Pahrump_Valley

F-I.2-88
Exhibit B2

Field Data

(See attached CD in PDF format.)

F-I.2-89
F-I.2-90
F-I.2-91
F-I.2-92
F-I.2-93
F-I.2-94
F-I.2-95
F-I.2-96
F-I.2-97
F-I.2-98
F-I.2-99
F-I.2-100
F-I.2-101
F-I.2-102
F-I.2-103
F-I.2-104
F-I.2-105
F-I.2-106
F-I.2-107
F-I.2-108
F-I.2-109
Exhibit B2 

DesertXpress Field Data

For

Ivanpah Lake Area

Ivanpah-Pahrump Valleys Watershed

(HUC 16060015) 

HBG 

Watershed 

Number

HUC 12 Watershed Name

HBG 

Field 

Data

ICF Jones 

& Stokes 

Field Data

Comments

28 Wheaton Wash-Frontal 

Ivanpah Lake Yes Yes

29 Kokoweef Canyon-Frontal 

Ivanpah Lake No No

Only north edge of this watershed is 

within previous route Segment 4A. This 

watershed not in currently preferred route 

Segment 4 ALT C. Urban Drainage 

features. Delineated by HBG using 

adjacent watershed data. 

30 Ivanpah Lake Yes Yes

Watershed is shaped like an hourglass 

with Roach (dry) Lake in the north half 

and Ivanpah Lake in the south half. All of 

DesertXpress route within this watershed 

is in south half. Portion of Study Area in 

this watershed drains to Roach (dry) Lake.

31 Whiskey Spring-Frontal 

Ivanpah Lake Yes Yes

F-I.2-110
F-I.2-111
F-I.2-112
F-I.2-113
F-I.2-114
F-I.2-115
F-I.2-116
F-I.2-117
F-I.2-118
F-I.2-119
F-I.2-120
F-I.2-121
F-I.2-122
F-I.2-123
F-I.2-124
F-I.2-125
F-I.2-126
F-I.2-127
F-I.2-128
F-I.2-129
F-I.2-130
F-I.2-131
F-I.2-132
F-I.2-133
F-I.2-134
F-I.2-135
F-I.2-136
F-I.2-137
F-I.2-138
F-I.2-139
F-I.2-140
F-I.2-141
F-I.2-142
F-I.2-143
F-I.2-144
F-I.2-145
F-I.2-146
F-I.2-147
F-I.2-148
F-I.2-149
F-I.2-150
F-I.2-151
F-I.2-152
F-I.2-153
F-I.2-154
F-I.2-155
F-I.2-156
F-I.2-157
F-I.2-158
F-I.2-159
F-I.2-160
F-I.2-161
F-I.2-162
F-I.2-163
F-I.2-164
F-I.2-165
F-I.2-166
F-I.2-167
F-I.2-168
F-I.2-169
F-I.2-170
F-I.2-171
F-I.2-172
F-I.2-173
F-I.2-174
F-I.2-175
F-I.2-176
F-I.2-177
F-I.2-178
F-I.2-179
F-I.2-180
F-I.2-181
F-I.2-182
F-I.2-183
F-I.2-184
F-I.2-185
F-I.2-186
F-I.2-187
F-I.2-188
F-I.2-189
F-I.2-190
F-I.2-191
F-I.2-192
F-I.2-193
F-I.2-194
F-I.2-195
F-I.2-196
F-I.2-197
F-I.2-198
F-I.2-199
F-I.2-200
F-I.2-201
F-I.2-202
F-I.2-203
F-I.2-204
F-I.2-205
F-I.2-206
F-I.2-207
F-I.2-208
F-I.2-209
F-I.2-210
F-I.2-211
F-I.2-212
F-I.2-213
F-I.2-214
F-I.2-215
F-I.2-216
F-I.2-217
F-I.2-218
F-I.2-219
F-I.2-220
F-I.2-221
F-I.2-222
F-I.2-223
F-I.2-224
F-I.2-225
F-I.2-226
F-I.2-227
F-I.2-228
F-I.2-229
F-I.2-230
F-I.2-231
F-I.2-232
F-I.2-233
F-I.2-234
F-I.2-235
F-I.2-236
F-I.2-237
F-I.2-238
F-I.2-239
F-I.2-240
F-I.2-241
F-I.2-242
F-I.2-243
F-I.2-244
F-I.2-245
F-I.2-246
F-I.2-247
F-I.2-248
F-I.2-249
F-I.2-250
F-I.2-251
F-I.2-252
F-I.2-253
F-I.2-254
F-I.2-255
F-I.2-256
F-I.2-257
F-I.2-258
F-I.2-259
F-I.2-260
F-I.2-261
F-I.2-262
F-I.2-263
F-I.2-264
Exhibit B2 

DesertXpress Field Data

For

Ivanpah Lake Area

Ivanpah-Pahrump Valleys Watershed

(HUC 16060015) 

HBG 

Watershed 

Number

HUC 12 Watershed Name

HBG 

Field 

Data

ICF Jones 

& Stokes 

Field Data

Comments

28 Wheaton Wash-Frontal 

Ivanpah Lake Yes Yes

29 Kokoweef Canyon-Frontal 

Ivanpah Lake No No

Only north edge of this watershed is 

within previous route Segment 4A. This 

watershed not in currently preferred route 

Segment 4 ALT C. Urban Drainage 

features. Delineated by HBG using 

adjacent watershed data. 

30 Ivanpah Lake Yes Yes

Watershed is shaped like an hourglass 

with Roach (dry) Lake in the north half 

and Ivanpah Lake in the south half. All of 

DesertXpress route within this watershed 

is in south half. Portion of Study Area in 

this watershed drains to Roach (dry) Lake.

31 Whiskey Spring-Frontal 

Ivanpah Lake Yes Yes

F-I.2-265
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Exhibit B2 

DesertXpress Field Data

For

Ivanpah Lake Area

Ivanpah-Pahrump Valleys Watershed

(HUC 16060015) 

HBG 

Watershed 

Number

HUC 12 Watershed Name

HBG 

Field 

Data

ICF Jones 

& Stokes 

Field Data

Comments

28 Wheaton Wash-Frontal 

Ivanpah Lake Yes Yes

29 Kokoweef Canyon-Frontal 

Ivanpah Lake No No

Only north edge of this watershed is 

within previous route Segment 4A. This 

watershed not in currently preferred route 

Segment 4 ALT C. Urban Drainage 

features. Delineated by HBG using 

adjacent watershed data. 

30 Ivanpah Lake Yes Yes

Watershed is shaped like an hourglass 

with Roach (dry) Lake in the north half 

and Ivanpah Lake in the south half. All of 

DesertXpress route within this watershed 

is in south half. Portion of Study Area in 

this watershed drains to Roach (dry) Lake.

31 Whiskey Spring-Frontal 

Ivanpah Lake Yes Yes

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Exhibit C

Representative Areas Potentially Excluded from 

Corps Jurisdiction Based on Corps-EPA Rapanos 

Guidance, DesertXpress Project, HUC 8 Ivanpah – 

Pahrump Valleys Watershed Draining to 

Ivanpah Dry Lake

F-I.2-491
E

E

E

E

E

E

E

E

31D1

31MD4

3-S-1

75-1w

3-S-17

71-1w Main

72-1 Alt c

30D14

E

0 0.5 1 2 3 4 5

Miles

Aerial Source: NAIP 2005/2006

Roach 

Dry

Lake

Ivanpah

Dry

Lake

31

28

30

29

Map Dated: July 24, 2010

Exhibit C. Map Showing Representative Areas Potentially Subject to Corps Jurisdiction Under Section 404 of the Clean Water Act, DesertXpress Project,

HUC 8 Ivanpah - Pahrump Valleys Watershed Draining to Ivanpah Dry Lake, Clark County, Nevada.

Representative Ephemeral Drainages Found With

an Observable Ordinary High Water Mark

Representative Ephemeral Drainages Found With

an Observable Ordinary High Water Mark

Legend

Study Area USGS NHD Playa 

E Sampling Point

30 - Ivanpah Lake

32 - Porter Wash-Frontal Ivanpah Lake

33 - Town of Jean-Frontal Ivanpah Lake

34 - Lookout Peak

35 - Town of Goodsprings

HUC 12 Digit Subwatersheds Crossed 

by the Rapanos Review Area

Representative Ephemeral Drainages Found With

an Observable Ordinary High Water Mark

F-I.2-492
Exhibit D

Hydrology Maps for CWA Jurisdictional Analysis 

F-I.2-493
F-I.2-494
F-I.2-495
F-I.2-496