Prepared for: 

United States Fish and Wildlife Service 

Alamosa, Colorado 

Draft Environmental Assessment of 

Planned Gas and Oil Exploration, Baca 

National Wildlife Refuge, Saguache 

County, Colorado 

January 2008 
 

U.S. Fish and Wildlife Service

San Luis Valley National Wildlife Refuge Complex 

9383 El Rancho Lane • Alamosa, CO 81101 

Phone (719)589-4021• Fax (719)587-0595 

January 18, 2008 

Dear Interested Party: 

Enclosed for your review is the Environmental Assessment of Proposed Gas and Oil Exploration, Baca National 

Wildlife Refuge, Saguache County, Colorado. This document was prepared by the U.S. Fish and Wildlife Service 

(Service) in compliance with the National Environmental Policy Act (NEPA). 

This draft Environmental Assessment (EA) analyzes the adoption of standards and measures by the Service to 

ensure that initial exploration of the mineral estate under the Baca National Wildlife Refuge (Refuge) by Lexam 

Explorations (U.S.A.) Inc. (Lexam) constitutes a reasonable use of the Refuge’s surface estate. The scope of this 

EA does not address production of natural gas and oil from any of the wells described above. If necessary, the 

Service regulation of production and associated transportation would be the subject of a separate analysis pursuant 

to the NEPA. 

The U.S. owns the surface estate of the Refuge, and it is administered by the Service as a National Wildlife 

Refuge pursuant to the Great Sand Dunes National Park and Preserve Act of 2000, the NWR System 

Administration Act, and other applicable laws and regulations. As the surface owner, the Service has a 

responsibility to protect the surface estate of the Refuge and its associated resources. Pursuant to Colorado law 

and the Surface Use Agreement that was entered into between the Service’s and Lexam's predecessors-in-interest, 

the Service has discretion to ensure that Lexam’s use of the surface estate is reasonable and does not cause undue 

surface disturbance. Thus, the Service has both the responsibility and the authority to formulate standards and 

measures for ensuring that the surface estate of the Refuge and its associated resources are not unreasonably 

impacted by Lexam’s planned activities. 

In response to public requests to delay the release of the draft EA and/or extend the public comment period, we 

are releasing the draft EA as soon as possible and extending the public comment period to 45 days from the 

release date to enable public opportunity to review and comment on this draft EA. The public comment period 

will end on March 2, 2008. 

This document is also available for viewing or downloading on the Service’s website at: 

http://www.fws.gov/alamosa

In preparing the final decision document the Service will carefully consider all comments received during the 45 

day comment period. There will not be an additional public comment period prior to or after a final determination 

by the Service. 

Written comments or questions you may have concerning this proposal are welcome. Comments should be 

directed to: U.S. Fish and Wildlife Service, ATTN: Michael Blenden, 9383 El Rancho Lane, Alamosa, CO 81101, 

or by email at Baca_EA@fws.gov. 

Sincerely, 

Michael Blenden, Project Leader 

San Luis Valley NWR Complex 

Region 6, National Wildlife Refuge System 
Prepared for: 

United States Fish and Wildlife Service 

Alamosa, Colorado 

Draft Environmental Assessment of 

Planned Gas and Oil Exploration, Baca 

National Wildlife Refuge, Saguache 

County, Colorado 

January 2008 
Acronyms and Abbreviations 

°F degrees Fahrenheit 

3D three dimensional 

AIRFA American Indian Religious Freedom Act 

APCD Air Pollution Control Division

APD applications for permit to drill 

APE area of potential effect 

APEN Air Pollutant Emission Notice 

ARPA Archaeological Resource Protection Act 

BMP best management practices 

BOP blowout preventer 

CCP comprehensive conservation plan 

CDA Colorado Department of Agriculture 

CDOW Colorado Division of Wildlife 

CDPHE Colorado Department of Public Health and Environment 

CDWR Colorado Department of Water Resources 

CFR Code of Federal Regulations 

CNHP Colorado Natural Heritage Program 

COGCC Colorado Oil and Gas Conservation Commission 

CR County Road 

CRS Colorado Revised Statute 

dBA decibels on the “A” weighted scale 

DOLA Colorado Department of Local Affairs 

DOT Department of Transportation 

EA Environmental Assessment 

EO Executive Order 

ESA Endangered Species Act 

Ldn sound level day/night 

i January 2008
Leq(24) 24-hour equivalent sound level 

Lexam Lexam Explorations (U.S.A.) Inc. 

MBTA Migratory Bird Treaty Act 

MD measured depth 

mg/L milligrams per liter 

NAGPRA Native American Graves Protection and Repatriation Act 

NEPA National Environmental Policy Act 

NHPA National Historic Preservation Act 

NMPM New Mexico Prime Meridian 

NPS National Park Service 

NRCS Natural Resources Conservation Service 

NRDC Natural Resources Defense Council 

NRHP National Register of Historic Places 

NWI National Wetland Inventory 

NWR National Wildlife Refuge 

OSHA Occupational Safety and Health Administration 

RFFA Reasonably Foreseeable Future Actions 

Refuge Baca National Wildlife Refuge 

SH State Highway 

SHPO State Historic Preservation Office 

SLV RETAC San Luis Valley Regional Emergency Medical Services/Trauma Advisory Council 

SPCC Plan Spill Prevention, Control, and Countermeasure Plan 

SWMP Storm Water Management Plan 

SVOC Semi-volatile organic compound 

SWSP substitute water supply plan 

TCP traditional cultural property 

TDS total dissolved solids 

TNC The Nature Conservancy 

ii January 2008
iii January 2008

TVD total vertical depth 

U.S. United States 

USC United States Code 

USDA United States Department of Agriculture 

USEPA United States Environmental Protection Agency 

USFS United States Forest Service 

USFWS United States Fish and Wildlife Service 

VOC volatile organic compound 
Contents 

1.0 Purpose and Need .....................................................................................................................................1-1

1.1 Introduction ..........................................................................................................................................1-1

1.2 Background..........................................................................................................................................1-3

1.2.1 Mineral Ownership.................................................................................................................1-3

1.2.2 Previous Exploration..............................................................................................................1-3

1.2.3 Current Planned Exploration Program..................................................................................1-4

1.3 Purpose and Need for the Proposed Action.......................................................................................1-4

1.4 Conformance with USFWS Management Plans ................................................................................1-4

1.5 Relation to Statutes, Regulations, and Other Plans...........................................................................1-6

1.5.1 USFWS Regulations..............................................................................................................1-6

1.5.2 Other Laws Relating to Oil and Gas Activity on NWR System Lands .................................1-7

1.5.3 Other Federal Regulations ....................................................................................................1-8

1.5.4 State Regulations and Rules.................................................................................................1-9

1.6 Description of Lexam’s Planned Exploration Program.......................................................................1-9

1.6.1 Road and Drill Pad Construction...........................................................................................1-9

1.6.2 Drilling Operations ...............................................................................................................1-14

1.7 Identification of Issues .......................................................................................................................1-18

2.0 Description of Proposed Project and Alternatives ...............................................................................2-1

2.1 Introduction ..........................................................................................................................................2-1

2.2 Proposed Action Alternative................................................................................................................2-1

2.3 No Federal Involvement Alternative (No Action Alternative) .......................................................2-6

2.4 No Mineral Exploration Alternative ...............................................................................................2-7

2.5 Alternatives Considered but Eliminated from Further Analysis............................................................2-7

2.5.1Suspend Drilling Until Completion of a Comprehensive Conservation Plan ............................2-7

2.5.2 Directionally Drill the Wells from Outside of the Refuge...........................................................2-9

2.5.3 Permit Only One Well ..............................................................................................................2-11

2.5.4 Deny Lexam Access ................................................................................................................2-11

3.0 Affected Environment ...............................................................................................................................3-1

3.1 Introduction ..........................................................................................................................................3-1

3.1.1 Baca Refuge ..........................................................................................................................3-1

3.1.2 Project Area ...........................................................................................................................3-1

3.2 Geology, Minerals, and Soils ..............................................................................................................3-1

3.2.1 Geology..................................................................................................................................3-1

3.2.2 Minerals..................................................................................................................................3-3

3.2.3 Soils........................................................................................................................................3-3

3.3 Air Resources ......................................................................................................................................3-5

3.3.1 Climate ...................................................................................................................................3-5

iv January 2008
3.3.2 Air Quality...............................................................................................................................3-5

3.4 Water Resources (Quantity and Quality)............................................................................................3-6

3.4.1 Surface Water........................................................................................................................3-6

3.4.2 Groundwater ..........................................................................................................................3-6

3.5 Vegetation and Habitats ......................................................................................................................3-7

3.5.1 Vegetation Communities .......................................................................................................3-7

3.5.2 Special Status Plant Species ..............................................................................................3-13

3.5.3 Invasive and Noxious Weeds..............................................................................................3-13

3.6 Wildlife and Fisheries ........................................................................................................................3-14

3.6.1 Recreationally and Economically Important Species and Nongame Wildlife....................3-14

3.6.2 Special Status Species........................................................................................................3-23

3.7 Cultural Resources ............................................................................................................................3-35

3.7.1 Regulatory Framework ........................................................................................................3-35

3.7.2 Cultural Resources Investigations.......................................................................................3-35

3.8 Native American Traditional Values..................................................................................................3-37

3.9 Recreation..........................................................................................................................................3-38

3.10 Socioeconomic Resources................................................................................................................3-39

3.10.1 Population ............................................................................................................................3-39

3.10.2 Economic Overview.............................................................................................................3-39

3.10.3 Income, Poverty, and Unemployment.................................................................................3-39

3.10.4 Demographic Characteristics ..............................................................................................3-40

3.10.5 Housing................................................................................................................................3-40

3.10.6 Traffic ...................................................................................................................................3-40

3.10.7 Emergency Services............................................................................................................3-40

3.10.8 Land Use and Ownership....................................................................................................3-41

3.10.9 Environmental Justice .........................................................................................................3-41

3.11 Aesthetics...........................................................................................................................................3-41

3.11.1 Visual Resources.................................................................................................................3-41

3.11.2 Noise ....................................................................................................................................3-42

4.0 Environmental Consequences.................................................................................................................4-1

4.1 Introduction ..........................................................................................................................................4-1

4.2 Geology, Mineral Resources, and Soils..............................................................................................4-2

4.2.1 Effects of Lexam’s Planned Exploration Program................................................................4-2

4.2.2 Proposed Action Alternative..................................................................................................4-2

4.2.3 No Federal Involvement Alternative......................................................................................4-3

4.2.4 No Mineral Exploration Alternative........................................................................................4-3

4.2.5 Cumulative Impacts ...............................................................................................................4-3

4.3 Air Quality.............................................................................................................................................4-3

4.3.1 Effects of Lexam’s Planned Exploration Program................................................................4-3

4.3.2 Proposed Action Alternative..................................................................................................4-4

4.3.3 No Federal Involvement Alternative......................................................................................4-5

v January 2008
4.3.4 No Mineral Exploration Alternative........................................................................................4-5

4.3.5 Cumulative Impacts ...............................................................................................................4-5

4.4 Water Resources.................................................................................................................................4-5

4.4.1 Effects of Lexam’s Planned Exploration Program................................................................4-5

4.4.2 Proposed Action Alternative..................................................................................................4-6

4.4.3 No Federal Involvement Alternative......................................................................................4-7

4.4.4 No Mineral Exploration Alternative........................................................................................4-7

4.4.5 Cumulative Impacts ...............................................................................................................4-7

4.5 Vegetation and Habitats ......................................................................................................................4-8

4.5.1 Effects of Lexam’s Planned Exploration Program................................................................4-8

4.5.2 Proposed Action Alternative..................................................................................................4-8

4.5.3 No Federal Involvement Alternative......................................................................................4-9

4.5.4 No Mineral Exploration Alternative......................................................................................4-10

4.5.5 Cumulative Impacts .............................................................................................................4-10

4.6 Wildlife and Fisheries ........................................................................................................................4-10

4.6.1 Effects of Lexam’s Planned Exploration Program..............................................................4-10

4.6.2 Proposed Action Alternative................................................................................................4-10

4.6.3 No Federal Involvement Alternative....................................................................................4-13

4.6.4 No Mineral Exploration Alternative......................................................................................4-13

4.6.5 Cumulative Impacts .............................................................................................................4-14

4.7 Cultural Resources ............................................................................................................................4-14

4.7.1 Effects of Lexam’s Planned Exploration Program..............................................................4-14

4.7.2 Proposed Action Alternative................................................................................................4-14

4.7.3 No Federal Involvement Alternative....................................................................................4-15

4.7.4 No Mineral Exploration Alternative......................................................................................4-15

4.7.5 Cumulative Impacts .............................................................................................................4-15

4.8 Native American Traditional Values..................................................................................................4-16

4.8.1 Effects of Lexam’s Planned Exploration Program..............................................................4-16

4.8.2 Proposed Action Alternative................................................................................................4-16

4.8.3 No Federal Involvement Alternative....................................................................................4-16

4.8.4 No Mineral Exploration Alternative......................................................................................4-16

4.8.5 Cumulative Impacts .............................................................................................................4-16

4.9 Recreation..........................................................................................................................................4-17

4.9.1 Effects of Lexam’s Planned Exploration Program..............................................................4-17

4.9.2 Proposed Action Alternative................................................................................................4-17

4.9.3 No Federal Involvement Alternative....................................................................................4-17

4.9.4 No Mineral Exploration Alternative......................................................................................4-17

4.9.5 Cumulative Impacts .............................................................................................................4-17

4.10 Socioeconomic Resources................................................................................................................4-18

4.10.1 Effects of Lexam’s Planned Exploration Program..............................................................4-18

4.10.2 Proposed Action Alternative................................................................................................4-19

4.10.3 No Federal Involvement Alternative....................................................................................4-19

4.10.4 No Mineral Exploration Alternative......................................................................................4-19

4.10.5 Cumulative Impacts .............................................................................................................4-19

vi January 2008
4.11 Aesthetics...........................................................................................................................................4-19

4.11.1 Visual Resources.................................................................................................................4-19

4.11.2 Noise ....................................................................................................................................4-21

5.0 Consultation and Coordination................................................................................................................5-1

5.1 Introduction ..........................................................................................................................................5-1

5.2 Preparers and Reviewers....................................................................................................................5-1

5.3 Persons and Agencies Contacted.......................................................................................................5-2

5.4 Summary of Public Participation .........................................................................................................5-2

6.0 References..................................................................................................................................................6-1

List of Appendices 

Appendix A - Protection Measures and Conditions 3-D Seismic Survey

Appendix B - USFWS Manual, Land Use Series, 612 FW 2, Oil and Gas

Appendix C - COGCC Permits Issued for Baca#5 and Baca #6

Appendix D - Agreement Between Saguache County and Lexam Explorations (U.S.A.)

Appendix E - Baseline Surface Water and Groundwater Sampling Analytical Results

vii January 2008
viii January 2008

List of Tables 

Table 1-1 Total Surface Disturbance............................................................................................................1-9

Table 3-1 2005 Saguache County Emission Inventory (Tons per Year) ....................................................3-5

Table 3-2 Vegetation Types Present in the Project Area ..........................................................................3-10

Table 3-3 Vegetation Types and Sub-communities that Occur in the Project Vicinity .............................3-10

Table 3-4 Wetland Types Present in the Project Area ..............................................................................3-11

Table 3-5 Noxious Weeds Potentially Occurring within the Project Area .................................................3-15

Table 3-6 Special Status Species Identified for the Environmental Assessment of Lexam’s 

Planned Oil and Gas Exploration...............................................................................................3-24

Table 3-7 Summary of Native American Consultation...............................................................................3-37

Table 3-8 Maximum Permissible Noise Levels..........................................................................................3-43

Table 5-1 List of Preparers and Reviewers..................................................................................................5-1

List of Figures 

Figure 1-1 Project Location............................................................................................................................1-2

Figure 1-2 Proposed Lexam Gas Exploration Wells.....................................................................................1-5

Figure 1-3 Typical Well Location Layout .....................................................................................................1-13

Figure 1-4 Well Casing Program .................................................................................................................1-15

Figure 2-1 Baca #5 Access Road Reroute....................................................................................................2-8

Figure 2-2 Directional Drilling Patterns........................................................................................................2-10

Figure 3-1 Project Area General Geology .....................................................................................................3-2

Figure 3-2 Project Area Soil Map Units .........................................................................................................3-4

Figure 3-3 Baseline Water Sampling Locations............................................................................................3-8

Figure 3-4 Vegetation Classification for the 3D Seismic Region Survey Area ............................................3-9

Figure 3-5 Designated Elk Winter Range....................................................................................................3-19

Figure 3-6 Designated Mule Deer Winter Range........................................................................................3-20

Figure 3-7 Designated Pronghorn Winter Range........................................................................................3-21
1.0 Purpose and Need 

The purpose of this Environmental Assessment (EA) is to ensure that initial exploration of the mineral estate 

under the Baca National Wildlife Refuge (Refuge) by Lexam Explorations (U.S.A.) Inc. (Lexam) is conducted in 

a reasonable manner. By establishing stipulations and recommendations to protect the surface estate and 

other resources of the Refuge from unreasonable damage during all phases of currently planned oil and gas 

exploration being conducted by Lexam, including the intended drilling of two exploratory gas wells on the 

Refuge, the USFWS seeks to protect Refuge resources while at the same time honoring Lexam's vested rights 

to access and explore the mineral estate. 

1.1 Introduction 

Authorized in 2000, the Baca National Wildlife Refuge is one of the largest and most recent additions to the 

National Wildlife Refuge System (NWR System) administered by the USFWS, Department of the Interior. The 

approved Refuge acquisition boundary consists of over 92,500 acres located in Saguache and Alamosa 

counties in the San Luis Valley of south-central Colorado (Figure 1-1) and includes some lands which were 

part of the “Luis Maria Baca Grant No. 4” - commonly referred to as the “Baca Ranch.” Congress approved this 

refuge boundary and authorized acquisition of lands within it with passage of Public Law 106-530, also known 

as the “Great Sand Dunes National Park and Preserve Act of 2000.” This legislation focused not only on 

protecting the region's hydrology, which the unique sand dunes ecosystem depends upon, but also protecting 

the ecological, cultural, and wildlife resources of the area. 

The proposed purpose of the Refuge is “to restore, enhance and maintain wetland, upland, riparian and other 

habitats for wildlife, plants and fish species that are native to the San Luis Valley, Colorado. Management of 

the refuge will emphasize migratory bird conservation and will consider the refuge's role in broader landscape 

conservation efforts” (USFWS 2005). 

Situated in the San Luis Valley, a high mountain desert surrounded by two 14,000-foot mountain ranges, the 

Refuge contains a diverse suite of habitats including desert shrublands, grasslands, wet meadows, playa 

wetlands, and riparian areas. Fed primarily by melting mountain snow, numerous streams flow across the 

Refuge providing an abundance of life in an otherwise arid landscape. The Refuge is home to a large number 

of wildlife and plant species. 

The Refuge abuts lands owned or controlled by other conservation entities including The Nature Conservancy 

(TNC), the National Park Service (NPS), and the Colorado State Land Board. This complex of lands, totaling 

more than 500,000 acres, contains one of the largest and most diverse assemblages of wetland habitats 

remaining in Colorado. 

In addition to the plant and animal resources contained on the refuge, the area also is rich in historic and 

cultural resource sites, some of which date over 12,000 years ago. Many of these are eligible to be placed on 

the National Register of Historic Places. On federally managed lands, such as the Refuge, eligible sites share 

the same management status as already listed sites. 

Lexam owns the mineral interest, including the right to explore for and develop oil and gas, beneath land now 

included within the Refuge. Lexam acquired its mineral interest prior to acquisition of the surface interest in 

the Baca Ranch by the USFWS and inclusion of the surface in the NWR System. 

With respect to State of Colorado law on subsurface mineral rights in Colorado, the subsurface mineral 

property owner has rights to pursue recovery of its minerals. 

1-1 January 2008
Project

Area

Baca

#1 and #2

160

285

17

112

69

150

15

114

368

374

370

285

159

96

371

Conejos Conejos

Costilla Costilla

Alamosa Alamosa

Rio Rio

Grande Grande

Huerfano Huerfano

Custer Custer

Saguache Saguache

U.S. Fish & Wildlife Service

Baca National Wildlife Refuge

Saguache and Alamosa Counties, Colorado

Figure 1-1 -- Project Location

Map Location

Colorado

N

UTM ZONE 13

NAD 27

Legend

Project Area

Baca NWR Acquisition Boundary

3D Seismic Survey Area

Great Sand Dunes National Preserve

Great Sand Dunes NP

Acquisition Boundary

San Luis State Park and

Wildlife Area

Elevation

High : 4274

Low : 2251

0 51 2.5 0

Miles

0 5 10 2.5

Kilometers
Lexam has provided satisfactory evidence to USFWS showing that it is legal owner of the above mentioned 

separated mineral rights below portions of the Refuge, and therefore is legally entitled to make use of the 

surface for exploration. The USFWS would deny surface access without such evidence. As established legal 

owner of portions of the Baca Refuge subsurface mineral estate, Lexam has contacted the USFWS regarding 

its intention to explore the subsurface mineral estate. 

1.2 Background 

1.2.1 Mineral Ownership 

Lexam’s mineral interest underlies a large tract of land including portions of the Refuge that were originally 

granted to the Baca family by the United States (U.S.) government as replacement for land lost in the Mexican 

American War. There are 100,000 acres of land in the Baca Grant, which is located in Townships 41 to 

43 North (T41N to T43N) and Ranges 10 to 12 East (R10E to R12E), New Mexico Prime Meridian (NMPM) in 

Saguache County. On the Baca Grant, Lexam presently owns a 100 percent interest in the non-oil and gas 

mineral rights and a 75 percent interest in the oil and gas rights. Fifty percent of the non-oil and gas minerals 

were acquired from Baca Minerals, Inc. in 1987. Later, the other 50 percent interest in the non-oil and gas 

minerals and 50 percent of the oil and gas rights were purchased from Newhall Land and Farming Company. 

Lexam acquired an additional 25 percent of the oil and gas rights in 1998. The remaining 25 percent of the oil 

and gas rights is owned by ConocoPhilips. 

Surface access and use was and is provided by Lexam’s ownership of the mineral estate and is further 

provided for by a Surface Use Agreement that was signed in 1992 by the previous owner and Lexam’s 

predecessors in-interest. The Surface Use Agreement is a 20-year agreement (of two 10-year terms) that 

describes Lexam’s rights to use the surface of the Baca Grant. The agreement may be extended beyond the 

current lease term should production be achieved from the property. Lexam also pays taxes to Saguache 

County based upon its mineral interest. In 2006, this payment amounted to approximately $15,000. 

1.2.2 Previous Exploration 

Lexam conducted mineral exploration drilling in the early 1990s. Twenty-seven mineral exploration boreholes 

drilled in 1992 and 1993 encountered strong shows of live oil, but the shows were not indicative of 

commercially producible hydrocarbons (Watkins et al. 1995; Cappa and Wallace 2007). The oil shows are 

evidence of a large, concealed seep located more than 4 miles along the east margin of the San Luis Valley. 

Analyses indicated that the oil is Cretaceous in origin. Cretaceous sedimentary rocks are a major source of oil 

and gas produced in the Rocky Mountain region. 

Data available in the public domain and proprietary data obtained by Lexam were combined with data from the 

mineral exploration drill holes to map and interpret the geology beneath the Baca Grant. This mapping led to 

the drilling of two exploration wells - the Baca #1 and Baca #2 wells (Figure 1-1). These wells were permitted 

with the Colorado Oil and Gas Conservation Commission (COGCC) and were drilled in 1995. The Baca #1 

was drilled to a depth of 4,322 feet and the Baca #2 was drilled to a depth of 6,932 feet. The wells were 

plugged and abandoned in 1996 in accordance with COGCC rules and plugging orders (COGCC approved 

surface reclamation January 2007 [COGCC 2007]). Data obtained from the Baca #1 and Baca #2 wells along 

with two dimensional seismic data acquired in 1996, 1998, 1999, and 2002 and data from other exploration 

techniques indicated that a thicker Cretaceous section is present on deeper blocks under parts of the Baca 

Grant. This information led to Lexam’s proposal to locate two exploration wells in a prospective area in the 

north-central portion of the Baca Grant generally located in the southern portions of T43N, R11E NMPM. 

These proposed wells, both of which are within the boundaries of the Refuge, were permitted with the COGCC 

as Baca #5 and Baca #6). Baca wells #3 and #4 were permitted but never drilled, but also were located in the 

southern part of T43N, R11E. 

1-3 January 2008
1.2.3 Current Planned Exploration Program 

In order to define the exploration target, Lexam performed a three dimensional (3D) seismic exploration 

program on these lands, after receiving a permit from the COGCC to conduct the program. The 3D seismic 

survey area is shown on Figure 1-1. Also prior to conducting the 3D seismic program, Lexam and the USFWS 

mutually agreed upon measures to mitigate impacts of the program including the decontamination of vehicles 

(power washing, and cleaning) prior to entering the Refuge and archaeological surveys of project areas 

(Appendix A). In late summer/early fall of 2006, Lexam conducted an archaeological inventory of the Baca #5 

and Baca #6 drill sites and access roads, and the entire length of the lines to be used in conducting the 3D 

seismic program. The seismic program was conducted in early 2007 in accordance with the agreed upon 

protection measures. New information resulting from the 3D seismic program led to defining better targets for 

the planned drilling program and changes to the proposed drill locations. These new targets are identified as 

Baca amended #6 (forthwith referred to as Baca #6) and Baca #7 drill locations (Figure 1-2). The amended 

Baca #6 was close enough to the original and did not require a new permit. Drilling will occur on Baca #5 and 

on either Baca #6 or Baca #7 locations; a total of two wells will be drilled. Drilling is scheduled to occur during 

2008. Seismic and exploration drilling activities require the posting of bonds according to COGCC regulations. 

Statewide financial assurance bonds of $25,000 are required for drilling or seismic operations (COGCC 700 

Series Rules). Separate bonds were posted for seismic and drilling activities. Seismic activities require a 

notice of intent be filed with the COGCC before seismic activities can commence. 

1.3 Purpose and Need for the Proposed Action 

The purpose of this EA is to ensure that initial exploration of the mineral estate is conducted in a reasonable 

manner. By establishing stipulations and recommendations to protect the surface estate and other resources 

of the Refuge from unreasonable damage during all phases of currently planned oil and gas exploration being 

conducted by Lexam, including the intended drilling of two exploratory gas wells on the Refuge, the USFWS 

seeks to protect Refuge resources while at the same time recognizing Lexam's vested rights to access and 

explore the mineral estate. 

The scope of this EA does not address production of natural gas and oil from any of the wells described 

above. If necessary, the USFWS regulation of production and associated transportation would be the subject 

of a separate analysis pursuant to the National Environmental Policy Act (NEPA). 

The U.S. owns the surface estate of the Refuge, and it is administered by the USFWS as a National Wildlife 

Refuge pursuant to the Great Sand Dunes National Park and Preserve Act of 2000, the NWR System 

Administration Act, and other applicable laws and regulations. As the surface owner, the USFWS has a 

responsibility to protect the surface estate of the Refuge and its associated resources. Pursuant to Colorado 

law and the Surface Use Agreement that was entered into between the previous landowner and Lexam's 

predecessors-in-interest, the USFWS has discretion to ensure that Lexam’s use of the surface estate is 

reasonable and does not cause undue surface disturbance. Thus, the USFWS has both the responsibility and 

the authority to formulate standards and measures for ensuring that the surface estate of the Refuge and its 

associated resources are not unreasonably impacted by Lexam’s planned activities. 

1.4 Conformance with USFWS Management Plans 

The Refuge conceptual management plan (2005) provides a broad overview of the USFWS's proposed 

management approach to wildlife and their relative habitats, public uses, facilities, interagency coordination, 

and other operational needs of the Refuge until such a time that a full comprehensive conservation plan can 

be created. The comprehensive conservation plan (CCP) planning process for the Refuge is scheduled to 

start with baseline data collection in 2008, but development of the CCP will take several years. The CCP will 

1-4 January 2008
Proposed

Access Road

Proposed

Access Road

Willow

Camp

Lexam Road

Baca #6

Baca #7

Baca #5

U.S. Fish & Wildlife Service

Baca National Wildlife Refuge

Saguache and Alamosa Counties, Colorado

Figure 1-2 -- Proposed Lexam Gas Exploration Wells

Map Location

Colorado

N

UTM ZONE 13

NAD 27

012 0.5

Miles

012 0.5

Kilometers

Legend

Proposed Well Location

Proposed Access Road

Project Area

3D Seismic Survey Area

Baca NWR Boundary
provide a thorough, in-depth analysis of all facets of current and future refuge management activities. Given 

the limited scope of Lexam’s current proposal, the USFWS has determined that it can commence prior to 

preparation of the CCP as long as protective measures are in place to protect the surface and other resources 

of the Refuge and insure that the exploration activities do not interfere with regular Refuge management. 

1.5 Relation to Statutes, Regulations, and Other Plans 

Oil and gas management is not new to the USFWS as the agency has managed oil and gas operations on 

approximately one quarter of the over 575 National Wildlife Refuges in the NWR System. Under the National 

Wildlife Refuge Administration Act of 1966, as amended, the USFWS is responsible for managing all activities 

on refuges including oil and gas operations on non-federally owned (private) mineral rights on refuges. It is the 

policy of the USFWS “to protect USFWS resources to the maximum extent possible without infringing on the 

rights of sub-surface owners”. The following sections describe the legal framework under which the USFWS 

regulates oil and gas exploration that takes place on Refuge lands where the USFWS does not own the 

subsurface rights. In addition to USFWS' regulations concerning oil and gas activities, other statutes and 

regulations are cited. 

1.5.1 USFWS Regulations 

1.5.1.1 Excepted Mineral Rights 

USFWS Manual, Land Use Series, 612 FW 2, Oil and Gas (Manual) (USFWS 2007) provides standard policy 

guidance and background information on management of oil and gas activities on NWR System lands 

(Appendix B). In this Manual, the USFWS provides for the exercise of non-federally owned mineral rights 

while protecting USFWS resources to the maximum extent possible. The provisions of the Manual applicable 

to Lexam’s mineral interests that are discussed below recognize and incorporate these concepts. 

On a large portion of the Refuge, Lexam holds “excepted rights” that also are referred to as “outstanding 

rights” (USFWS 2007). Excepted rights occur when oil and gas rights are owned by third parties at the time the 

USFWS acquires title to the lands. The “owner of excepted (outstanding) oil and gas rights has the right to sell, 

lease, explore for, and remove those minerals subject to the terms of the instrument by which that interest was 

acquired or reserved and to the State laws governing protection of the surface and the rights of the surface 

owner.” Section 2.9.B of the Manual provides the procedural requirements for permitting oil and gas activities 

on USFWS lands (2007). 

In addition to the Manual (USFWS 2007), reserved and excepted rights are addressed in the NWR System 

Administration Act of 1966 and addressed by the regulation in Title 50 Code of Federal Regulations (CFR) 

29.32 (Mineral Rights Reserved and Excepted). This regulation provides general rules governing the exercise 

of reserved and excepted mineral rights on NWR System lands. 50 CFR 29.32 states the following: 

Persons holding mineral rights in wildlife refuge lands by reservation in the conveyance to the 

United States and persons holding mineral rights in such lands which rights vested prior to the 

acquisition of the lands by the United States shall, to the greatest extent practicable, conduct 

all exploration, development, and production operations in such a manner as to prevent 

damage, erosion, pollution, or contamination to the lands, waters, facilities and vegetation of 

the area. So far as is practicable, such operations also must be conducted without 

interference with the operation of the refuge or disturbance to the wildlife thereon. Physical 

occupancy of the area must be kept to the minimum space compatible with the conduct of 

efficient mineral operations. Persons conducting mineral operations on refuge areas must 

comply with all applicable federal and state laws and regulations for the protection of wildlife 

and the administration of the area. Oil field brine, slag, and all other waste and contaminating 

substances must be kept in the smallest practicable area, must be confined so as to prevent 

escape as a result of rains and high water or otherwise, and must be removed from the area 

as quickly as practicable in such a manner as to prevent contamination, pollution, damage, or 

1-6 January 2008
injury to the lands, waters, facilities, or vegetation of the refuge or to wildlife. Structures and 

equipment must be removed from the area when the need for them has ended. Upon the 

cessation of operations the area shall be restored as nearly as possible to its condition prior to 

the commencement of operations. Nothing in this section shall be applied so as to contravene 

or nullify rights vested in holders of mineral interests on refuge lands. 

The USFWS Manual, 612 FW2 Section 2.9.B (7) states: 

The key factors in successfully balancing the development of private mineral interests and the 

protection of wildlife and other resources on Service lands are early and frequent 

communication and cooperation between the Service and the mineral rights owner, and a 

commitment to reasonableness on the part of both parties. 

The USFWS and Lexam have engaged in the “early and frequent communication and cooperation” described 

in the Manual, much of which is documented in the conditions that were agreed to between Lexam and the 

USFWS regarding the seismic survey that was conducted in the winter of 2007. 

1.5.1.2 Compatible Uses Policy 

The NWR System Administration Act of 1966, Policy 603 FW 2 Compatible Uses Policy and the National 

Wildlife Refuge System Improvement Act, set forth general rules and provides guidelines for determining 

compatibility of proposed and existing uses of Refuge. However, provisions of 630 FW 2, as they relate to the 

compatibility standard of the NWR System Administration Act to the exercise of reserved and excepted 

mineral rights on NWR System lands, state the following: 

The Service must recognize and allow owners’ property rights that are not vested in the 

federal government, such as reserved or excepted rights, to explore and develop minerals or 

oil and gas beneath a refuge, regardless of whether the use is compatible. In these situations, 

a compatibility determination is not required and should not be completed. 

Therefore, the compatibility standard of the NWR System Administration Act does not apply to Lexam’s 

exploration program on the Refuge. 

1.5.1.3 Appropriate Refuge Use Policy 

The NWR System Administration Act of 1966, Policy 603 FW 1 Appropriate Refuge Uses Policy, sets forth 

general rules and provides guidelines for determining appropriate uses of national wildlife refuges. The 

Appropriate Refuge Use Policy of the NWR System Administration Act, does not apply to Lexam’s exploration 

program on the Refuge for the reasons described above in section 1.5.1.2 and because exercise of the 

subsurface mineral holders’(Lexam’s) rights is not at the USFWS’s discretion and jurisdiction. 

1.5.2 Other Laws Relating to Oil and Gas Activity on NWR System Lands 

1.5.2.1 National Environmental Policy Act 

NEPA (42 United States Code [USC] 4321 -4370f) requires federal agencies to examine the environmental 

impact of their actions, incorporate environmental information, and utilize public participation, as appropriate, in 

the planning and implementation of their actions. NEPA compliance is required only whenever a federal 

agency takes an action. A federal action typically takes the form of a permit or other explicit land use 

authorization without which the activity cannot proceed. As discussed above, although USFWS regulations 

and the Manual (USFWS 2007) explicitly recognize that the USFWS has the right and is obligated to prevent 

unreasonable degradation of the surface resources of the Refuge, USFWS does not have the authority to 

completely deny Lexam’s activities on the Refuge. However USFWS, in an effort to assist in agency planning 

and decision making, has decided to apply the NEPA process to the utilization of its discretionary authority to 

prevent unreasonable degradation of the surface resources of the Refuge. 

1-7 January 2008
1.5.2.2 National Historic Preservation Act (NHPA) of 1966, as amended 

Section 106 of the NHPA requires federal agencies to assess the effects of an undertaking on historical and 

archaeological sites. This is accomplished by inventorying proposed disturbance areas or area of potential 

effect (APE), evaluating site importance and eligibility to the National Register of Historic Places (NRHP), 

assessing the effect of the undertaking on NRHP-eligible sites, and consulting with appropriate historic 

preservation agencies. The proposed action is not considered an undertaking as defined by NHPA, and 

therefore is not subject to review. Nevertheless, the USFWS is conducting a review of effects on historical and 

archaeological sites in order to ensure that the proposed measures protect cultural resources to the maximum 

extent practicable. 

1.5.2.3 Archaeological Resources Protection Act of 1979 

The Archaeological Resources Protection Act of 1979 (16 USC 470aa-470mm) and amendments provide for 

the protection of archaeological resources on public and Native American lands and provide for exchange of 

information between governmental entities and academic or private archaeological researchers. An 

archaeological resource under the Act is defined as material remains of past human life or activities that are of 

archaeological interest and includes utensils, art work, weapons, and fossilized human remains. 

1.5.2.4 Migratory Bird Treaty Act and Migratory Bird Conservation Act 

The Migratory Bird Treaty Act (MBTA) (16 USC 703-712) is an Act of Congress that implements various 

treaties between the United States and other nations of the MBTA and provides for the protection of migratory 

birds and specifies penalties for harming or unlawfully killing migratory birds. Section 715e of the Migratory 

Bird Conservation Act provides statutory authority for regulation of reserved mineral rights on refuge lands (it 

subordinates oil and gas interests to such rules and regulations as may be prescribed by the Secretary from 

time to time). 

1.5.2.5 Endangered Species Act 

The Endangered Species Act (ESA) (16 USC 1531-1544) provides for the protection of endangered and 

threatened species and the habitats upon which they depend. Section 7 of the act requires federal agencies, to 

consult with the Secretary of the Interior or the Secretary of Commerce in cases where the agencies’ action 

may affect a listed species, to ensure that actions they authorize, fund, or carry out are not likely to jeopardize 

the continued existence of threatened or endangered species or result in the destruction or adverse 

modification of critical habitat for these species. 

1.5.3 Other Federal Regulations 

The planned Lexam exploration activities also are governed by a number of other federal regulatory programs. 

The list below is not intended to be exhaustive: 

• Clean Water Act 

• Clean Air Act 

• American Indian Religious Freedom Act (AIRFA) 

• Native American Grave Protection and Repatriation Act (NAGPRA) 

• Resource Conservation Recovery Act 

• Occupational Health and Safety Administration (OSHA) regulations 

• Department of Transportation (DOT) regulations 

1-8 January 2008
1.5.4 State Regulations and Rules 

The major regulatory agencies and programs under which the planned natural gas and oil exploration drilling 

activities are regulated are discussed below. 

1.5.4.1 Colorado Oil and Gas Conservation Commission 

The Colorado Oil and Gas Conservation Commission (COGCC) regulates oil and gas drilling on state and 

private mineral lands in Colorado. COGCC oil and gas rules cover all phases of oil and gas drilling operations, 

address pollution prevention, and provide for penalties and fines for non-compliance with the rules. The oil and 

gas rules give the Commission staff latitude when developing conditions of approval for applications for permit 

to drill (APDs) depending on specific site concerns or conditions. In the case of the Baca #5, and Baca #6, 

APDs, 18 conditions of approval were applied to the permits (Appendix C). The Baca #7 permit is pending, 

but it is expected that the same 18 conditions will apply. Issuance of drilling permits by the COGCC in no way 

diminishes the authority of the USFWS to regulate activities to prevent unreasonable impacts to surface 

resources. 

1.5.4.2 Colorado Department of Public Health and Environment 

Major regulatory programs of the Colorado Department of Public Health and Environment (CDPHE) that apply 

to the exploration activities include the regulation of storm water discharges during construction activities, 

storage and disposal of solid waste, and air emissions sources. 

1.6 Description of Lexam’s Planned Exploration Program 

The following provides a description of Lexam’s planned gas and oil exploration program, including a 

description of the protection measures that have been incorporated into the COGCC permits to drill at the 

request of USFWS (Appendix C). 

Lexam’s planned activities will incorporate Best Management Practices (BMPs) where appropriate to lessen 

impacts. BMPs are “techniques, procedures, measures, or practices which are regularly used in the industry 

and are site specific, economically feasible, and are used to guide, or may be applied to, management actions 

to aid in achieving desired outcomes. Measures or procedures that can be utilized within a BMP may include, 

but are not limited to, structural and nonstructural controls, operational procedures, and maintenance 

procedures” (ALL Consulting 2002). 

1.6.1 Road and Drill Pad Construction 

Before drilling can occur, access roads and well pads will be constructed. The following describes the general 

procedure for construction. No construction would occur during the months of May, June or July. Table 1-1

summarizes the approximate total acres of disturbance for access roads and pads. Construction will be 

conducted in accordance with COGCC 1000 Series rules and a Storm Water Management Plan (SWMP) for 

construction disturbances greater than 1.0 acre in accordance with CDPHE storm water rules 

(CDPHE 2007a). 

Table 1-1 Total Surface Disturbance 

Approximate Acres of 

Road/Well Disturbance 

Total Surface Disturbance Baca #5 and Baca #6 Drill Sites 

Baca #5 Location 2.1 

Baca #5 Access Road 3.3 

1-9 January 2008
Table 1-1 Total Surface Disturbance 

Approximate Acres of 

Disturbance 

1-10

Road/Well 

Baca #6 Location 2.1 

Baca #6 Access Road 7.0 

Total Acres 14.5 

Total Surface Disturbance Baca #5 and Baca #7 Drill Sites 

Baca #5 Location 2.1 

Baca #5 Access Road 3.3 

Baca #7 Location 2.1 

Baca #7 Access Road 4.2 

Total Acres 11.7 

The following summarizes the requirements of the COGCC regarding surface disturbance and site reclamation 

for non-crop land sites (COGCC 2007). The following procedures apply to site preparation, drilling, and 

reclamation: 

• “The operator shall separate and store the A soil horizon or the top six (6) inches, whichever is 

deeper, and mark or document stockpile locations to facilitate subsequent reclamation. When 

separating the A soil horizon, the operator shall segregate the horizon based upon noted changes in 

physical characteristics such as color, texture, density or consistency.” 

• “When the soil horizons are too rocky or too thin for the operator to practicably segregate, then the 

topsoil shall be segregated to the extent possible and stored. Too rocky shall mean that the soil 

horizon consists of greater than thirty five percent (35%) by volume rock fragments larger than ten 

(10) inches in diameter. Too thin shall mean soil horizons that are less than six (6) inches in thickness. 

The operator shall segregate remaining soils on crop land to the extent practicable to a depth of three 

(3) feet below the ground surface or bedrock, whichever is shallower, based upon noted changes in 

physical characteristics such as color, texture, density or consistency and such soils shall be 

stockpiled to avoid loss and mixing with other soils.” 

• “All stockpiled soils shall be protected from degradation due to contamination, compaction and, to the 

extent practicable, from wind and water erosion during drilling and production operations. Best 

management practices (BMPs) to minimize erosion and offsite sedimentation by controlling storm 

water runoff shall be implemented.” The best management practices can include, depending on site 

conditions, silt fences, plant buffers, rock filter dikes, slope roughening, and mulch.” 

• “The drilling location shall be designed and constructed to provide a safe working area while 

reasonably minimizing the total surface area disturbed. Consistent with applicable spacing orders and 

well location orders and regulations, in locating drill pads, steep slopes shall be avoided when 

reasonably possible. The drill pad site shall be located on the most level location obtainable that will 

accommodate the intended use. Deep vertical cuts and steep long fill slopes shall be constructed to 

the least percent slope practical. BMPs minimize erosion and offsite sedimentation by controlling 

storm water runoff shall be implemented.” 

 January 2008
• “In order to reasonably minimize land disturbances and facilitate future reclamation, well sites...and 

access roads shall be located, constructed and maintained so as to reasonably control dust, minimize 

erosion, alteration of natural features and removal of surface materials. BMPs to minimize erosion and 

offsite sedimentation by controlling storm water runoff shall be implemented.” 

• “Existing roads shall be used to the greatest extent practicable to avoid erosion and minimize the land 

area devoted to oil and gas operations. BMPs to minimize erosion and offsite sedimentation by 

controlling storm water runoff shall be implemented. Where feasible and practicable, operators are 

encouraged to share access roads in developing a field. Where feasible and practicable, roads shall 

be routed to complement other land usage. To the greatest extent practicable, all vehicles used by the 

operator, contractors, and other parties associated with the well shall not travel outside of the original 

access road boundary.“ 

• “During drilling, production, and reclamation operations, all disturbed areas shall be kept reasonably 

free of noxious weeds and undesirable species as practicable.” 

• “Upon the plugging and abandonment of a well, all ... mouse and rat holes and cellars shall be 

backfilled. All debris, abandoned gathering line risers and flow line risers, and surface equipment shall 

be removed within three (3) months of plugging a well. All access roads to plugged and abandoned 

wells and associated production facilities shall be closed, graded and recontoured. Culverts and any 

other obstructions that were part of the access road(s) shall be removed. Well locations, access roads 

and associated facilities shall be reclaimed. As applicable, compaction alleviation, restoration, and 

revegetation of well sites, associated production facilities, and access roads shall be performed to the 

same standards as established for interim reclamation under Rule 1003.” Additionally, “All such 

reclamation work shall be completed within three (3) months on crop land and twelve (12) months on 

non-crop land after plugging a well or final closure of associated production facilities. The Director may 

grant an extension where unusual circumstances are encountered, but every reasonable effort shall 

be made to complete reclamation before the next local growing season.” 

Successful reclamation of the well site and access road will be considered completed when: 

• “On non-crop land, reclamation has been performed as per Rules 1003. and 1004., and the total cover 

of live perennial vegetation, excluding noxious weeds, provides sufficient soils erosion control as 

determined by the Director through a visual appraisal. The Director shall consider the total cover of 

live perennial vegetation of adjacent or nearby undisturbed land, not including overstory or tree 

canopy cover, having similar soils, slope and aspect of the reclaimed area.” 

• “A Sundry Notice, Form 4, has been submitted by the operator which describes the final reclamation 

procedures and any mitigation measures associated with final reclamation performed by the operator.” 

• “A final reclamation inspection has been completed by the Director, there are no outstanding 

compliance issues relating to Commission rules, regulations, orders, permit conditions or the act, and 

the Director has notified the operator that final reclamation has been approved.” 

In addition to the COGCC 1000 Series rules concerning erosion control and reclamation, the CDPHE has a 

permit system under the Clean Water Act to provide control over storm water discharges and minimize soil 

erosion and degradation of water resources. The storm water permit system specifies reclamation goals and 

requires that operators have an SWMP. The SWMP defines what erosion controls will be used during ground 

disturbing activities, explains how hazardous materials (such as oils and fuels) will be managed to prevent soil 

and water contamination, and specifies how reclamation and monitoring will occur. The major features of a 

Stormwater Management Plan (SWMP) include: 

• Identification of site specific measures that will be used to control erosion and BMPs including silt 

fences, plant buffers, rock filter dikes, slope roughening, and mulch. The SWMP includes descriptions 

and drawings of the specific erosion control structures to be used. 

1-11 January 2008
• The SWMP should identify materials that will be stored and used on-site and procedures for 

preventing and managing spills. Spill prevention and management can be addressed separately in a 

Spill Prevention, Control, and Countermeasure (SPCC) Plan. SPCC plans must be site specific, 

comply with applicable rules, and be certified by a professional engineer. The SWMP and SPCC plans 

must be kept on-site. 

• The SWMP must describe the methods used for site stabilization of the site. Stabilization methods can 

include standards for dealing with compaction, seed mixtures, and seeding method (drill seeding, 

hydromulching, etc). 

• Procedures for inspection and maintenance are described in the SWMP. Periodic inspections of 

erosion control devices and re-vegetation progress are required and the SWMP must describe how 

inspection and maintenance is to take place and how it is to be documented. In addition to periodic 

inspections, inspections are required after strong precipitation events as defined by the permit. 

Final stabilization of a site under the CDPHE storm water rules, “means that all ground surface disturbing 

activities at the site have been completed, and all disturbed areas have been either built on, paved, or a 

uniform vegetative cover has been established with an individual plant density of at least 70 percent of 

pre-disturbance levels, or equivalent permanent, physical erosion reduction methods have been employed. 

Re-seeding alone does not qualify.” For oil and gas operations, if a site reverts to cropland after oil and gas 

activities, then permit coverage is no longer required. 

1.6.1.1 Road Construction 

The routes for the planned access roads have been designed to minimize the amount of road construction and 

impacts to habitat, soils, and sensitive plants. BMPs as described above will be used to minimize runoff and 

erosion and facilitate reclamation. Access roads to the locations will branch off of the Lexam Road, a main 

north-south road through the Refuge (Figure 1-2). The Lexam Road is gravel and will not need to be upgraded 

to handle the equipment and traffic. An access road to the Baca #5 location will have to be built. The road will 

be approximately 1.1 miles long with a running surface of approximately 15 feet. Total width of disturbance will 

be approximately 25 feet. For access to locations Baca #6 and #7, there already exists a two-track unimproved 

road that goes to those locations. To access the Baca #6 location, an additional road will have to be built with 

the same running width and overall width of disturbance as the Baca #5 access road. The existing two-track 

road will be upgraded to accommodate the equipment needed to transport the drilling rig and service the 

operation. The distance of the access road to the Baca #7 location that will be upgraded will be approximately 

1.4 miles. The additional distance of road that will be constructed to the Baca #6 location will be approximately 

0.9 mile for a total of approximately 2.3 miles. 

Road construction may take from 1 week to 1 month to complete depending upon the terrain and soil 

conditions. The equipment will consist of haul trucks for transporting earth moving equipment and gravel, and 

earth moving equipment. Water trucks will be required to wet down the location for dust control. 

1.6.1.2 Well Pad Construction 

Disturbance for each well pad is expected to be approximately 2.1 acres, allowing for a nominal 90,000 square 

foot well pad and soil stockpile areas (Figure 1-3). BMPs as described above will be used in pad construction 

as required by COGCC rules to control runoff and erosion. Bulldozers (two to three D7-sized Caterpillars) will 

be used to construct and level the drilling locations. Top soil and growth medium will be stockpiled for later 

reclamation. The pads and access roads will be graveled as necessary to support the rig and the ongoing 

operations. Road and well pad construction will take place during daylight hours. 

1-12 January 2008
U.S. Fish & Wildlife Service

Baca National Wildlife Refuge

Saguache and Alamosa Counties, Colorado

44’ 150’ Sta. 2+00

185’

200’

50’

7590

7590

Topsoil Stockpile Sta. 4+00

120’

42.5’

200’

95’

Approx.

Toe of

Fill Slope

Road

7588

Sta. 1+10

CLOSED SYSTEMS

Existing

Drainage

Elev. Ungraded Ground at Location Stake = 7589.0’

Elev. Graded Ground at Location Stake = 7588.1’

7588

Topsoil Stockpile

Approx.

Top of

Cut Slope

LEXAM EXPLORATIONS (USA) INC.

LOCATION LAYOUT FOR 

BACA #5

SECTION 28, T43N, R11E, N.M.P.M.

2514’ FSL 2294 FWL

Prevailing

winds

SCALE: 1” = 60’

Date: 07-05-06

Drawn By: P.M.

REVISED: 01-22-07

Sta. 0+00

N

Spoils Stockpile

NOTE:

Flare Pit is to be

located a min. of 100’

from the Well Head.

Figure: 1-3 -- Typical Well Location Layout
1.6.2 Drilling Operations 

1.6.2.1 Location Preparation 

When the pad is completed, several operations will take place before the drilling rig moves on location. A small 

rig will move in, and drill and set approximately 80 to 150 feet of 20-inch conductor pipe. The conductor pipe 

will provide stability for the hole in the unconsolidated materials in the uppermost part of the subsurface. The 

conductor pipe will be cemented in place from a depth of approximately 80 to150 feet to the surface as 

required by the COGCC permit (Figure 1-4). The small rig also will drill the “rathole” and “mousehole,” which 

are used to manipulate and store pipe and equipment used in the drilling process. The rathole and mousehole 

would nominally be 13 to 24 feet deep, cased with 8.63-inch pipe, and be sealed from contact with 

groundwater. Drill location preparation will take approximately 3 days. Equipment typically used consists of a 

water well-type rig, several vehicles and trailers. The work will take place during daylight hours. 

After location preparation, the drilling rig and associated equipment will be moved to the location and erected. 

Moving a drilling rig may require 30 to 60 truck loads of equipment. After the pieces are assembled, the derrick 

will be raised to a height of approximately 135 feet. Derrick heights vary depending on the depth of the drill 

hole and weight capacity of the rig. 

1.6.2.2 Drilling 

Once the rig is ready, a 17.5-inch-diameter hole will be drilled to approximately 350 feet, at which point a string 

of 13.38-inch-diameter surface casing will be set and cemented from total depth to the surface (Figure 1-4). 

After the surface casing is set, a blowout preventer (BOP) will be attached to the top of the surface casing. A 

blowout is an uncontrolled release of subsurface fluids (oil, gas, and water) to the surface, which if ignited 

could cause a dangerous or hazardous fire. Through a system of hydraulically activated valves and manifolds, 

the BOP is designed to shut the well in and also allow fluid to be pumped into the hole and stop the 

uncontrolled release of fluids (i.e., to “kill” the well). BOPs are required by COGCC rule, and conditions of the 

drilling permit approval specify the pressure rating of the BOP, which depends on potential subsurface 

conditions. COGCC rules also require testing of the BOP before drilling out from the surface casing. 

Drilling fluid or mud will be circulated through the drill pipe to the bottom of the hole, through the bit, up the 

bore of the well, and finally to the surface. When the mud emerges from the hole, it will pass through a series 

of equipment used to screen and remove drill cuttings (rock chips) and sand-size solids. When the solids have 

been removed, the mud will be placed into holding tanks, and from the tank, pumped back into the well. The 

mud would be maintained at a specific weight and viscosity to cool the bit, seal off any porous zones (thereby 

protecting aquifers or preventing damage to producing zone productivity), control subsurface pressure, 

lubricate the drill string, clean the bottom of the hole, and bring the drill cuttings to the surface (Moore 1974). 

There are three common types of drilling fluids: water-based, oil-based, and synthetics. Water-based muds are 

the most common and are largely made up of water and bentonite, a naturally occurring clay that has special 

properties used to maintain proper viscosity and other properties over a wide range of drilling conditions. 

Lexam’s drilling operations will use fresh water-based drilling fluids, unless unforeseen downhole conditions 

require the use of different types of drilling fluids. 

Upon drilling out of the surface casing, the well will be deepened to a depth of approximately 3,000 feet. At that 

point, a 9.63-inch intermediate casing string (Figure 1-4) will be placed in the hole and cemented in from total 

depth to the surface in accordance with COGCC rules. The intermediate casing will be used to protect the 

deep aquifer and ensure stability of the hole as the well is deepened to its target depth. To provide additional 

protection for the aquifer, the 3,000-foot depth for the intermediate string is a permit condition irrespective of 

surface management issues. The COGCC has authority under Rule 317 to set casing and cementing 

requirements to protect aquifers. The 3,000-foot depth of intermediate aquifer protection casing was added as 

a condition of the drilling permits by the COGCC at the specific request of the USFWS. 

1-14 January 2008
U.S. Fish & Wildlife Service

Baca National Wildlife Refuge

Saguache and Alamosa Counties, Colorado

Conductor pipe

Surface casing

Intermediate casing

0 - 80 to 150 feet

0 - 350 feet

0 - 3000 feet

Figure: 1-4 -- Well Casing Program

Source: Schlumberger (2007), COGCC (2007)
After the intermediate casing is set, the well will be deepened, and prospective zones will be evaluated if 

encountered while drilling. Rock cores may be obtained depending on data derived during drilling. The 

expected total depth is approximately 14,000 feet, and once the total depth is reached, geophysical wireline 

well logs will be run. If warranted, formation productivity tests (drill stem tests or wireline formation tests) will be 

conducted on prospective zones. Data from logging and testing will support a determination as to the 

commercial potential of the zone(s) of interest. If the zones are deemed not to be commercially productive, the 

well will be plugged and abandoned according to COGCC regulations. If tests indicate commercial 

productivity, 5.5-inch production casing (Figure 1-4) will be run and set according to COGCC rules. The 

drilling rig will be rigged down and moved off to the next well or removed from the area. Rig down and move 

off should take an estimated 5 days subject to weather conditions and truck availability. The USFWS will 

perform another NEPA environmental review prior to any proposed oil and gas development in the Refuge. 

1.6.2.3 Well Abandonment and Reclamation 

Under COGCC reclamation rules, after a well is plugged, the drill site and access roads must be reclaimed. 

For final reclamation of well sites, the rules include the following requirements: 

• Upon the plugging and abandonment of a well, all mouse and rat holes, and cellars shall be backfilled. 

• All access roads to plugged and abandoned wells shall be closed, graded, and recontoured. Culverts 

and any other obstructions that were part of the access road(s) shall be removed. 

• Well locations, access roads, and associated facilities shall be reclaimed according to rules and 

including, as applicable, compaction alleviation, restoration, and revegetation of well sites and access 

roads. 

COGCC rules allow the surface owner to waive reclamation requirements. If, for instance, the surface owner 

wants to retain roads, the operator and surface owner can make agreement to do so. However, it is intent of 

the Refuge management that roads and pads be completely removed and the areas reclaimed to prior use in 

accordance with COGCC rules regarding reclamation, the operator must comply with the provisions of the 

SWMP requirements concerning final site stabilization. 

In addition, USFWS regulations 50 CFR 29.32, Mineral Rights Reserved and Excerpted, requires oil and gas 

companies to restore their sites as closely as possible to the conditions that existed before the project. 

Lexam’s restoration efforts will be under the direct supervision of the USFWS, using only endemic plants and 

seed mixtures approved by the USFWS. The USFWS will monitor restoration efforts from that point on to 

ensure that restoration efforts have been successful. 

1.6.2.4 Water Requirements 

Ideally to reduce impacts and disturbance to Refuge resources, water would be piped to the well locations 

using temporary plastic pipe laid out on the surface from the supply well to the drilling locations. Water 

requirements for the project are estimated to be a maximum of 15 acre-feet. Water would be obtained from a 

nearby monitoring well (SW-5) that is owned by the USFWS. The well is cased to approximately 181 feet 

below the ground surface and is considered to be tributary to the stream system. The well would be 

temporarily permitted as an industrial well for the duration of the project and a substitute water supply plan 

(SWSP) would be required from the Colorado Division of Water Resources to replace water pumped from 

SW-5. Lexam has investigated nearby agriculture water rights and transferring the consumptive use portion of 

those water rights to Well SW-5 to offset depletions arising from the drilling program. Lexam will file for a 

SWSP pursuant to Colorado Revised Statutes (CRS) 37-92-308(5), which applies when the depletions will not 

exceed 5 years. The plan would be approved for 1 year and can be renewed annually, but not to exceed 

5 years. 

1-16 January 2008
However, in the event that well water would not be available, water will have to be purchased from an off-site 

source and trucked to the drilling locations. Depending on daily water needs of the rig and the capacity of the 

tanker truck, as many as 250 truckloads per well could be required to supply water to the drilling operations. 

1.6.2.5 Solid Waste and Hazardous Materials 

Trash containers and portable toilets will be located on well sites during well pad construction, drilling 

operations, and site restoration. Toilet holding tanks will be pumped bi-weekly or as needed and their contents 

disposed of at a municipal sewage treatment facility in accordance with applicable rules and regulations 

regarding sewage treatment and disposal. Garbage, trash, and other non-hazardous waste material will be 

collected in a portable, self-contained, fully enclosed trash cage during operations. Trash will not be burned on 

location. The collected material will be hauled to an approved landfill. 

According the U.S. Environmental Protection Agency (USEPA) rule, certain wastes intrinsic to the drilling and 

production of oil and gas are exempt from regulation as hazardous wastes (USEPA 1988). Although exempted 

from regulation as hazardous wastes, it is still required that these wastes be disposed of according to 

applicable rules and in an environmentally acceptable manner. Drilling mud and drill cuttings are included in 

the exempt waste category. 

Drilling mud will constitute the largest volume of solid waste generated by the drilling operation. At the request 

of the USFWS, a condition of the COGCC permit requires use of a mud system that does not use an 

excavated reserve pit. The drilling system will be a closed-loop type of system in which all fluids and drill 

cuttings are contained in tanks. Also at the request of the USFWS, the COGCC permit requires Lexam to 

transport all drilling mud and drill cuttings to an off-site third-party commercial disposal facility permitted by 

CDPHE to handle such wastes. 

Lexam will maintain a file, according to 29 CFR 1910.1200 (g), containing Material Safety Data Sheets for all 

chemicals, compounds, and/or substances that will be used during drilling and completion operations. A 

variety of chemicals and materials, including petroleum fuels, lubricants, paints, and additives, are used to drill 

and complete a well. Some of these chemicals and materials may be considered hazardous or contain 

constituents that are hazardous. The transportation, use, storage, and handling of hazardous materials will 

follow procedures specified by federal and state regulations. Transportation of the materials to the well 

locations will be regulated by the DOT under 49 CFR, Parts 171–180. DOT regulations pertain to packaging, 

container handling, labeling, placards on vehicles, and other safety aspects. 

A SPCC Plan will be developed for the drill sites. A SPCC Plan is site-specific, describes how certain 

hazardous materials will be managed (oils and fuels), and provides information and procedures in case of a 

spill or release of those materials occurs. SPCC plans will be developed when a drilling contractor is chosen, 

since the SPCC Plan has to be specific to the equipment and storage that will be on-site. A SPCC Plan must 

be reviewed and certified by a professional engineer. Lexam will be responsible for providing the certification 

of the SPCC Plan. 

1.6.2.6 Workforce and Time Requirements 

Construction of the access road and drill pad will be completed by local contractors and only during daylight 

hours. When drilling commences, the operation will become a continuous 24-hour operation until the well is 

drilled to total projected depth. Following road and pad construction, the following personnel will be on-site for 

any given shift (tour): six rig hands including the driller, one tool pusher (drilling contractor’s supervisor), one 

company representative, one geologist, two mud loggers, one mud engineer, one water truck/equipment 

operator, and one gatekeeper. A rig crew will work one 12-hour tour per 24-hour day. Supervisory personnel, 

the geologist, mud loggers, mud engineer, water truck/equipment operator, and gatekeeper will be on-site 

24 hours per day. Other personnel will be on-site on a regular basis, but they are not considered part of the 

drilling personnel: drilling contractor health and safety supervisor, delivery drivers, suppliers, and government 

inspectors. Service company personnel (for cementing, BOP testing, wireline, drill stem testing, and casing) 

1-17 January 2008
will be present for the time needed to conduct given services (6- to 24-hour events). Therefore, at any given 

time there may be from 14 to 30 people on-site during drilling operations. It is estimated that each well would 

take approximately 60 to 90 days to drill and complete perhaps longer if unforeseen circumstances arise. 

1.6.2.7 Health and Safety 

Health and safety for drilling operations are governed by regulations of the COGCC, OSHA, and CDPHE. 

Conditions of the COGCC permit include the following health and safety measures: 

• Prior to commencing operations, an inventory of all chemicals and products that will be used or stored 

on site must be provided to the COGCC, the surface owner, and local emergency response personnel 

prior to bringing those substances on to the Refuge. If additional chemicals or products are required, 

then information about these substances must be provided to the COGCC, the surface owner, and 

local emergency response personnel prior to bringing them on to the Refuge. 

• Prior to commencing operations, an emergency response plan will be completed by Lexam and 

approved by the USFWS and discussed with local governments responsible for emergency services. 

A meeting with the local emergency response personnel will be held to establish an adequate safety 

and response plan for drilling and completion activities. 

A copy of the emergency response plan and emergency contact numbers will be provided to Refuge staff, 

local governments responsible for emergency services, and monitors before operations begin. 

1.7 Identification of Issues 

A number of resource protection issues were identified by the USFWS and Lexam prior to the 3D seismic 

survey and COGCC consideration of the Lexam’s Notice of Intent to conduct the seismic survey. Additional 

concerns were identified during the COGCC APD review process. These issues and concerns were 

incorporated into protection measures as agreed to by USFWS and Lexam or were incorporated into the 

seismic and drilling permits issued by the COGCC. Subsequently, concerns were identified through public 

scoping that is part of this EA process. These issues are summarized below. 

Concerns and potential impacts identified by the USFWS and Lexam are: 

• Introduction of noxious weeds to the Refuge; 

• Disturbance of cultural resources; 

• Disturbance impacts to migratory birds and other wildlife (especially during summer breeding) and 

their habitat; 

• Impacts to surface and groundwater resources; 

• Contamination of soil; 

• Impacts to sensitive habitat, wildlife, plants or other sensitive natural and cultural resource features 

while conducting operations; 

• Soil and vegetation impacts from moving equipment and construction activities; 

• Drill cuttings and drilling fluid disposal; 

• Conflicts with Refuge management activities; 

• Disturbance and potential damage to sensitive Rio Grande suckers (Colorado endangered) and Rio 

Grande Chub (Colorado species of concern) and their habitats in Crestone Creek; and 

1-18 January 2008
1-19 January 2008

• Ability of the USFWS to adequately monitor whether exploration operations are being conducted in a 

manner that minimizes surface impacts. 

Major issues and concerns that were identified during the COGCC’s APD review process were: 

• Introduction of non-native species and noxious weeds; 

• Groundwater quality; and 

• Disposal of drill cuttings. 

Major issues and concerns identified through the NEPA process include: 

• Degradation of air quality; 

• Degradation of surface water and groundwater quality; 

• Potential impacts to vegetation, habitats, and wildlife; 

• Increased noise; 

• Degradation of visual quality; 

• Management of hazardous materials and solid wastes; 

• Degradation of visual environment; 

• Impacts to human quality of life and livelihoods; and 

• Impacts to cultural resources. 
2.0 Description of Proposed Project and Alternatives 

2.1 Introduction 

The following section describes the Proposed Action Alternative, and two other alternatives - the No Federal 

Involvement Alternative (No Action Alternative); and the No Mineral Exploration Alternative - that will be 

considered in this EA. The intent of this EA is to analyze the standards and measures to be adopted by the 

USFWS to minimize the impact of the surface disturbing activities associated with the planned oil and gas 

exploration program on Lexam-owned mineral rights that underlie the Refuge. 

2.2 Proposed Action Alternative 

The USFWS is proposing standards for ensuring that the planned exploration of the mineral estate underlying 

the Refuge by Lexam does not unreasonably degrade or impact the Refuge’s surface estate and associated 

resources. In response to the potential impact issues and concerns as listed in Section 1.7, the USFWS also is 

proposing specific environmental protection measures to implement these standards. Certain of these 

measures have already been implemented with respect to seismic surveying that has been conducted by 

Lexam; other measures have been adopted by the COGCC and incorporated into conditions of approval of 

drilling permits issued for the planned drilling; and still other measures may be adopted by Lexam through 

agreement with the USFWS. Under the No Federal Involvement Alternative, the USFWS would have accepted 

Lexam's planned activities without imposition of any surface protection standards or measures (see 

Section 2.4). Taken together, these standards and measures are designed to ensure that the manner, 

location, and timing of Lexam's activities constitute a reasonable use of the Refuge's surface estate. Many of 

these protection measures were implemented when seismic operations were conducted in the winter of 

2006-2007 (listed in Appendix A). Additional protection measures were developed during the COGCC drilling 

permit application review and the development of this EA. 

To minimize the potential impacts identified in Section 1.7, Lexam and the USFWS have agreed to implement 

the following measures: 

1) All vehicles and equipment from outside the Refuge will be decontaminated per USFWS procedures 

to prevent the introduction of noxious weeds to the Refuge. 

2) All ground-disturbing activities associated with drilling operations and setup will require on-site 

archaeological monitoring. In addition, once timing of road and pad construction activities is 

determined, biologists will survey affected areas to document current wildlife activity and sensitivities 

to be addressed and/or avoided. 

3) Trained environmental monitors will continue to serve as liaisons between the Refuge Manager, 

construction contractor, and drill rig personnel and ensure that all operations are conducted in a 

manner that minimizes surface impacts. 

4) Impacts to sensitive habitat, wildlife, plants or other sensitive natural, cultural or historical resource 

features will be avoided to the extent possible while constructing the access road and well pads. 

5) All construction of roads and pads will occur in a way that best facilitates their subsequent complete 

removal and reclamation once Lexam activities have ceased at these sites. This includes separating 

and stockpiling topsoil layers on-site to be replaced during reclamation. All disturbed areas will be 

reclaimed per the COGCC requirements and with USFWS input. 

6) A baseline water quality study of the near-surface unconfined aquifer, deeper aquifers, and surface 

water in proximity to the planned well locations will be conducted prior to drilling. Baseline sampling 

has been conducted in the project area and the results are presented in Section 3.4. In addition, at 

least three monitoring wells will be installed near each well pad to monitor potential spills or releases. 

2-1 January 2008
7) Casings will be set with COGCC-approved cement to 3,000 feet below the surface which will fully 

protect the aquifers from contamination through communication in the borehole (Figure 1-4). 

8) A closed loop mud and drill cuttings system will be used to minimize impacts to surrounding habitats. 

In addition, drill cuttings will be isolated in an above-ground tank during drilling. Cuttings will be 

removed from the Refuge and disposed of off-site in accordance with state regulations. 

9) Drilling operations will be modified, as necessary, to reduce conflicts with regular Refuge management 

activities. 

10) A gate guard will be provided by Lexam, and approved by the USFWS, to document traffic entering 

and exiting the Refuge and to eliminate potential illegal entry onto the Refuge. 

11) Arrangements for additional USFWS law enforcement personnel will be made in the event it is 

deemed necessary to effectively enforce state, federal, refuge, and wildlife laws during drilling 

activities. 

12) Construction and drilling activities will be conducted from August 1 through April 30 in order to avoid 

conflicts with wildlife and limit ground disturbance activities to periods of low precipitation to minimize 

impacts to soil. 

13) Well sites will be located as far from sensitive wet meadow wetlands as practicable. 

14) Drill pads will be fenced if necessary to prevent large ungulates from gaining access to the sites. 

15) To protect special status species such as the Rio Grande Sucker and Rio Grande Chub, USFWS and 

Lexam will: 

− Establish a 0.25-mile buffer zone of no activity around potential and identified habitat. 

− Limit vehicle crossings to existing or pre-approved crossings. 

− Sample waterways for particulate matter, creating a baseline and regular monitoring during period 

of activity. 

− Assess stability and suitability of road water crossings prior to road construction and drilling 

activities. Perform upgrade, if needed. Conduct periodic monitoring of crossings during activities 

and documentation of any deficiencies that may occur that may be indicative of potential structural 

failure. 

− Provide dust suppression in the vicinity of waterway crossings. 

16) Pre- and post-drilling aerial photographs will be taken of the proposed drilling and road construction 

area. The photographs will be color and will provide complete coverage of the drilling and road 

construction area. The pre-survey documentation shall be submitted within 10 days of initiation of the 

drilling, the post-survey documentation shall be submitted within 110 days of completion along with a 

digitized version of the pre-survey photographs. These photographs will become the property of the 

Refuge. 

17) The Operator shall provide detailed maps or plats to the Refuge Manager or his authorized 

representative of the proposed project layout, showing routes, staging areas, construction areas, and 

work locations. 

18) All materials brought into the Refuge to build up the location pad will be authorized by the Refuge 

Manager or his authorized representative. To minimize the spread of invasive species, no top soils will 

be brought in from off refuge. 

19) Summaries of all the results generated from the water quality sampling, archaeological survey work 

and any other sampling or monitoring, including the results of Lexam’s exploratory drilling, will be 

provided to the Refuge Manager upon completion and summation. 

2-2 January 2008
20) The Operator’s drilling activities will be restricted to the period of August 1 through April 30. Any field 

operations conducted during the refuge's migratory bird closure period (May 1 through July 31) must 

be coordinated and authorized by the Refuge Manager or his authorized representative. FWS will 

consider allowing Lexam to continue work in early May if allowing access is necessary to complete 

activities and such activities would not impact the Refuge and resources greater than what is 

anticipated in the EA. Rigging and down operations can only be conducted during daylight hours. 

Drilling operations will be conducted 24 hours per day when drilling past the casing. 

21) The Operator shall designate an onsite representative for field operations who shall be present during 

all phases of the Operator's operation and be the sole representative of the Operator and 

subcontractors regarding all communications and decisions of the Refuge Manager or his authorized 

representative. The Operator shall keep the Refuge Manager or his authorized representative 

informed if there is any change of designated representative for field operations. 

22) Refuge officials will conduct an on site meeting before rig-up with representatives of the Operator, 

drilling contractor, subcontractors, suppliers and service companies. The purpose of the meeting is to 

go over regulations and such conditions that apply to work crew conduct on the refuge. 

23) Prior to rig-up, an Emergency Preparedness Plan covering exploratory drilling, well control, materials 

hauling, spill response, and fire evacuation, will be provided to the Refuge Manager and discussed in 

a pre-operation meeting to be held with local governments. The plan shall contain a telephone list 

naming key contacts for emergency operations and activation. 

24) The Operator will upgrade and maintain all access routes, roads and bridges designated for its use 

across the Refuge in accordance with acceptable specifications and standards. The Operator shall 

have road maintenance equipment and operator(s) readily available to perform road repairs and 

maintenance as needed, or as directed by the Refuge Manager or his authorized representative. 

25) Dust levels on regularly traveled access routes must be kept to a minimum. The Operator shall have a 

water truck and operator(s) readily available to perform dust abatement as needed, or as directed by 

the Refuge Manager or his authorized representative. Only water will be allowed for dust suppression 

efforts. Dust control measures shall be implemented throughout the traveled areas of the project area 

in addition to the dust abatement requirement in measure #15. 

26) The drill site and immediate access roads shall be constructed of refuge approved material for all 

drilling locations. Drill pads may not exceed 90,000 square feet in area. All existing drainage patterns 

within roads to be constructed shall be maintained uninterrupted by the use of culverts, bridges or 

other applicable techniques as specified and authorized by the Refuge Manager or his authorized 

representative. 

27) The soils at the location site will be tested using approved standards to determine levels of heavy 

metals, chemical pollutant, and other contaminants, prior to rig-up operations. Duplicate tests will be 

conducted before completion or at abandonment. If the exit test reveals levels above the background 

established by pre-drilling test, cleanup will be required. The most practical method of clean up is soil 

removal. Any quantity of soil removed will be replaced to the original contours. 

28) Upon completion of drilling operations, the Refuge Manager or his authorized representative must be 

advised within 120 days whether the well is to be retained or plugged. If the well site is to be 

abandoned, the well is to be plugged according to state law, all above ground structures removed and 

the site and road restored as directed by the Refuge Manager or his authorized representative. Any 

damage to existing surface vegetation, water channels, or other physical features shall be restored to 

original site conditions. All costs shall be born by the Operator. 

29) Pits, ponds and/or open tanks are prohibited. Portable enclosed tanks must be used in circulating 

operations for the temporary storage of all drilling fluids, cuttings, mud, and contaminants. All drilling 

fluids, cuttings, mud, contaminants, portable tanks, and other equipment must be transported off 

2-3 January 2008
Refuge to an state approved facility upon cessation of drilling activity. It is highly recommended that an 

auger tank be used for transferring drill cuttings and sand to a vehicle for off Refuge transport. 

30) All toxic construction and equipment supplies and refuse (oil, grease, gasoline, diesel, paint, and other 

petrochemical derivatives) shall be centrally stored. Wastes shall be disposed off refuge immediately 

following completion of drilling operations. In the event of an accidental spill or discharge of oil, brine, 

or any other petrochemical substance, the Operator shall immediately notify the Refuge Manager or 

his authorized representative. The Operator shall remove contaminated soils for proper disposal off 

Refuge, and replace such soils with the same type soils or of a type specified and approved by the 

Refuge Manager or his authorized representative. A site reclamation plan may be required by the 

Refuge Manager or his authorized representative. 

31) Catch pans or other liner systems approved by the Refuge Manager are required for equipment and 

locations such as mud pumps, bulk mud additive tanks, fuel tanks, mixing shed, generators, 

accumulator and lines, and under the entire rig floor. The catch pans will cover the entire surface area 

under the equipment. The rig floor catch pan will be tied to allow for wash down and mud drainage 

from drill pipe. The catch pans will be kept free and clean from accumulated debris and spill materials. 

32) The Operator will be responsible for providing all water needed for drilling operations. No waste water 

will be discharged onto Refuge lands, ditches, or water bodies. The Operator will provide a 

containerized or temporary septic system for domestic sewage disposal during drilling operations, 

which shall be removed upon completion of drilling. Use of portable toilets at drill site or the installation 

of a septic system, or similar treatment system or tanks will be required for any trailer or quarters on 

site. No surface discharge of septic system or portable toilet water is permitted. Septic tanks must be 

inspected weekly during operations and pumped as necessary. Upon completion of operations, the 

septic tanks must be pumped out and all material hauled away. 

33) All disposable type materials and trash brought onto the Refuge or generated at the drill site shall be 

removed from the Refuge on a biweekly basis and upon completion of the drilling activities. The drill 

site and operational area shall be kept free of debris and trash at all times. Trash shall be contained 

securely at the drill site in such a manner (fully enclosed trash cages) as to prevent trash from being 

spread by wind or wildlife. No trash may be disposed of or buried on the Refuge. 

34) General Refuge access conditions : 

− Access is to allow Lexam and/or its contractors access to portions of the Refuge for the purpose 

of carrying out drilling of oil and gas exploration wells Baca #5 and Baca #6 or Baca #5 and 

Baca #7 (either #6 or #7 would be drilled, but not both). 

− The Refuge Manager is the coordinating official having immediate jurisdiction and administrative 

responsibility for oil and gas operations on the Baca National Wildlife Refuge (Refuge) lands and 

property, all entry upon the Refuge must be coordinated with the Refuge Manager or his 

authorized representative The Refuge Manager must be advised at least 48 hours in advance of 

initial activity. 

− The failure of the U.S. to require strict performance of the terms, conditions, covenants, 

agreements, or stipulations of this permit for access to conduct exploration activities on national 

wildlife refuge lands, shall not constitute a waiver or relinquishment of the right of the United 

States to strictly enforce thereafter such terms, conditions, covenants, agreements, or stipulations 

which shall, at all times, continue in full force and effect. 

− Lexam and/or its contractors (Operator) shall save, hold harmless, defend, and indemnify the 

United States of America, its agents and employees for loss, damages, or judgments and 

expenses on account of bodily injury, death or property damage, or claims for bodily injury, death. 

or property damage of any nature whatsoever, and by whomever made, arising out of the 

Operator, his employees, subcontractors or agents with respect to the exploration of any and all 

mineral rights within the lands administered by the Refuge. 

2-4 January 2008
− All applicable federal and state regulations apply and will be in force. Operator shall be 

responsible for the actions of all exploration and support personnel. Violations of applicable laws 

or regulations will subject the operator and/or his employees to prosecution under state and/or 

federal laws. Individuals utilizing the Refuge under the Operator's authorization are subject to 

inspections of vehicles and their contents by federal and state law enforcement officers. 

− Proof of general liability insurance in the amount of $1,000,000 must be furnished to 

repair/mitigate any damages. This does not limit the liability for damages to this amount. 

− Operators will act in a manner that is respectful of Refuge habitats, wildlife, and property. Gates 

are to be locked or unlocked as they are found. 

− All vehicle access will be restricted to developed roads and two-tracks. All terrain vehicle use and 

deviations to vehicle use must be pre-approved by the Refuge Manager in writing prior to any 

action taken. 

− Vehicle speed limits will be set at the discretion of Refuge Manager and limits will be strictly 

adhered to. 

− No pets will be allowed on the Refuge. 

− Possession of firearms is strictly prohibited on the Refuge. 

− Fires are strictly prohibited in any areas of the Refuge. 

− Operators are not to be considered agents of the USFWS and are not to represent the USFWS in 

any matters. 

− Operators will perform all work in accordance with the highest standards of the industry and to the 

satisfaction of the USFWS. 

− Operators will perform all work in accordance with all applicable laws and regulations and will 

obtain all necessary permits or licenses when required to do so. 

− All personnel and activities shall be restricted to the immediate drilling area and the direct access 

road to the drill site. 

− Feeding wildlife species is prohibited. Molesting or destroying the home or dens of wildlife is 

prohibited. If dens are found during the normal course of operations, distinctive flagging will be 

used to alert all personnel of the den location. Adverse impacts on fish, wildlife and the 

environment shall be kept to an absolute minimum. All road kills will be reported to the Refuge 

Manager or his authorized representative. 

− Littering is prohibited. All cans, bottles, lunch papers, and operations trash must be removed. 

Cigarette butts are considered litter. All vehicles will be equipped with a container to carry out 

trash. 

− All necessary permits, contacts and clearances must be completed or obtained by and at the 

Operator's expense. Copies of all permits and clearances must be documented prior to the start of 

the activity. 

− No overnight quarters will be permitted on the refuge unless authorized by Refuge Manager. 

In addition to the protective measures and access conditions described above, Lexam and Saguache County 

have entered into an agreement to provide protective measures for county resources. The agreement and 

measures are provided in Appendix D. Provisions include reimbursement to the county for road repair and 

signage and testing of drilling fluid and drill cuttings to be disposed in Saguache County. 

2-5 January 2008
2.3 No Federal Involvement Alternative (No Action Alternative) 

For the purposes of this EA, it is assumed that under the No Federal Involvement Alternative, the USFWS 

would accept Lexam's planned activities without negotiating any surface protection standards or measures for 

Lexam’s exploration activities. Oil and gas exploration activities would be conducted subject only to standard 

rules and conditions of approval imposed by the COGCC and other applicable rules and regulations of various 

federal and state agencies. For instance, the road agreement between Lexam and Saguache County would be 

in force in this alternative, but the planned access roads would not be sited to avoid sensitive species and 

instead would proceed directly to the drill sites. 

Under the No Federal Involvement Alternative, there would be many fewer specific conditions that Lexam 

would be obligated to follow. However, Lexam would have to comply with all applicable federal, state, and local 

regulations. Of the COGCC permit conditions; it should be noted that Conditions 4, 6, 7, 8, 9, 14, 15, 16, and 

17 were instituted at the request of the USFWS. It is not certain which of those requested conditions would 

have been applied to the permit in the absence of USFWS input, given the right of surface owners to negotiate 

surface reclamation and other access provisions or the COGCC’s authority to impose permit conditions to 

prevent environmental degradation as determined by the permit review process. 

The COGCC permit conditions included at the request of the USFWS are summarized below (the full permits 

are presented in Appendix C): 

Condition 4 - Surface casing depth will be set at a depth of 3,000 feet. 

Condition 6 - Prior to commencing operations, an inventory of all chemicals and products that will be used or 

stored on site must be provided to the COGCC, the surface owner, and local emergency response personnel 

prior to bringing those substances on to the Refuge. If additional chemicals or products are required, then 

information about these substances must be provided to the COGCC, the surface owner, and the local 

emergency response personnel prior to bringing them on to the Refuge. 

Condition 7- Prior to commencing operations, a meeting with the local emergency response personnel will be 

held to establish an adequate safety and response plan for drilling, completion, and production activities. 

Condition 8 - A closed loop mud and cutting system will be used and cuttings will be placed in an above 

ground and lined enclosure, unless landowner approval to use an alternative mud and cutting system is 

obtained in writing. 

Condition 9 - The drill cuttings will not be left at or buried on the drill site or elsewhere on the Baca National 

Wildlife Refuge, unless landowner approval is obtained in writing. Cuttings will be disposed in accordance with 

COGCC Rule 907. 

Condition 14 - A guard, provided by Lexam, shall be stationed at the property gate on County Road T during 

all drilling and completion activities. The guard will limit access to the property to Lexam employees, Lexam 

contractors, and other authorized personnel. 

Condition 15 - Baseline water quality data will be acquired from both near surface (unconfined aquifer) and 

deeper aquifers in proximity to proposed wells prior to the spud of the wells and again within six months after 

the wells are completed and/or plugged. Sampling and analysis procedures must be approved by the COGCC 

staff prior to conducting this work. Data will be provided to the COGCC and the surface owner. Data will be 

used to assess any possible long-term affects on ground water quality. 

Condition 16 - A minimum of one up-gradient and two down-gradient monitoring wells will be installed around 

each drill pad. The wells will be completed in the shallow unconfined aquifer. The locations and elevations of 

the wells will be surveyed and depth to water will be measured. Water samples will be collected for chemical 

2-6 January 2008
analysis before the wells are spud and at predetermined intervals thereafter, which will agreed to by the United 

States Fish and Wildlife Service (USFWS) and Lexam. If spills or releases of drilling related chemicals at sites 

occur, then the sampling frequency may be increased to a frequency agreed to by the USFWS, Baca Grande 

Water and Sanitation District, and Lexam. 

Condition 17 - Equipment and vehicles brought onto the Baca National Wildlife Refuge from outside the San 

Luis Valley must be cleaned and decontaminated to minimize introduction of non-native species and noxious 

weeds. 

In addition to the permit conditions included at the behest of the USFWS, some important actions have 

occurred because of the conditions imposed by the USFWS including Baca #5 access road re-route to avoid 

sensitive plant species and moving Baca #5 out of a wet meadow (Figure 2-1). These actions would not have 

occurred were it not for the protection measures and conditions imposed by the USFWS. In addition to actions 

described, protective measures that would not have been instituted include timing restrictions on activities to 

protect wildlife; vegetation, and soil resources; requirement for an emergency response plan, and any other 

provisions not listed as conditions in the COGCC permits, but are listed in Section 2.2; Proposed Action. 

2.4 No Mineral Exploration Alternative 

Under this alternative, several scenarios could occur including potential purchase of the mineral estate by the 

federal government, Lexam’s donation of the mineral estate to the federal government, or any other reason 

that Lexam might choose not to go forward with exploration. Another possible scenario, would be that the 

United States would acquire the Refuge’s severed mineral estate from Lexam and ConocoPhilips by purchase 

or exchange pursuant to the authorization contained in Section 8(a)(1) of the Great Sand Dunes National Park 

and Preserve Act of 2000, 16 USC 410hhh-6(a)(1). Federal acquisition of the outstanding mineral rights would 

preclude Lexam from proceeding with its planned exploration program, and the effects of that program would 

not occur. USFWS has not, to date, pursued this alternative because no funds have been identified or 

appropriated for the acquisition of the severed mineral estates, and Lexam and ConocoPhilips have not 

consented to such acquisition as required by 16 USC 410hhh-6(a)(1). Also, Lexam has stated that it fully 

intends to proceed with its planned exploration program (McEwen 2007). Consequently, it is uncertain 

whether this alternative is currently practicable. However, this alternative has been selected for analysis 

because, unlike the other alternatives analyzed in this EA, it describes a future without mineral resource 

exploration and its associated impacts and establishes an environmental baseline from which to measure the 

potential impacts of other alternatives. 

Under this alternative, it is assumed that no oil or gas exploration would occur on the Refuge; however regular 

Refuge management activities such as surveys and other baseline data collection activities for the 

Comprehensive Conservation Plan would take place beginning in 2008. 

2.5 Alternatives Considered but Eliminated from Further Analysis 

2.5.1 Suspend Drilling Until Completion of a Comprehensive Conservation Plan 

Suspension of the planned drilling pending development of a Comprehensive Conservation Plan (CCP) was 

eliminated from consideration because it is considered an unreasonable constraint on Lexam’s rights to 

develop its mineral estate. The purpose of this EA is to analyze the USFWS adoption of standards and 

measures to mitigate impacts of the drilling of only these two planned oil and gas exploration wells on the 

federal surface estate. Second, as noted above, the roads and drill pads affect approximately 14 acres of land 

on the Refuge. The CCP will apply to the entire refuge, which is approximately 92,500 acres. Therefore, 

USFWS believes that impact of this planned drilling program on surface resources of the Refuge can be 

thoroughly assessed and evaluated prior to the completion of the CCP. Finally, information obtained through 

Lexam’s proposed exploratory drilling will be beneficial to USFWS’ planning efforts by further defining the 

economic viability of the underlying mineral estate and predicting potential development scenarios which would 

be incorporated into the CCP. 

2-7 January 2008
Lexam Road

County Road T

Count

Approximate Original

Staked Road Location

Proposed Road

Location

8 10 7 9 12 11

Baca #6

Baca #7

Baca #5

U.S. Fish & Wildlife Service

Baca National Wildlife Refuge

Saguache and Alamosa Counties, Colorado

Figure 2-1 -- Baca #5 Access Road Reroute

Map Location

Colorado

Legend

Proposed Well Site

Proposed Access Road

Project Area

Baca NWR Acquisition Boundary

3D Seismic Survey Area UTM ZONE 13

NAD 27

N 0 2,000 4,000 1,000

Feet

0 500 1,000 250

Meters
2.5.2 Directionally Drill the Wells from Outside of the Refuge 

Generally, exploratory wells are vertically drilled because subsurface conditions cannot be predicted with 

certainty in unexplored areas, especially at greater depths and with a potential for over-pressurized zones. 

Directional drilling would increase the technical difficulties in drilling and create greater risk of losing the hole or 

creating potentially hazardous conditions. The Council on Environmental Quality further clarifies elimination of 

this alternative in its “Questions and Answers About the NEPA Regulations” (1981) when it states that 

“reasonable alternatives include those that are practical or feasible from the technical and economic 

standpoint.” Directional drilling of a 14,000-foot deep exploratory well was judged to be neither technically nor 

economically practical or feasible as described in the following discussion. 

Directional drilling is generally defined as “drilling a nonvertical hole through the earth” (Short 1993). There are 

a number of different designs of directional drilling including a simple slant hole, single bend, double bend, and 

extended reach (Figure 2-2). Directional drilling is conducted for a variety of reasons and includes multiple 

wells from one location, inaccessible surface locations, access productive zones from existing vertical bores, 

and enhance productivity. 

Lexam’s plans for testing the oil and gas potential of the Refuge by drilling the proposed wells are driven 

primarily by the interpretation of the available 2D and 3D seismic data. The importance of the seismic data is 

magnified by the very limited control available from previous drilling. Within the entire area of the Refuge and 

adjacent Great Sand Dunes National Park, well control is only available from Lexam’s Baca #1 and #2 wells. 

As defined by the results of oil and gas exploration conducted from 1995 to the present, no wells have been 

drilled in areas currently judged to be prospective for oil and gas. Because of lateral variations in geologic 

formations within the area, the Baca #1 and #2 wells do not provide suitable well control for interpreting 

seismic data in the area of the proposed wells. 

Seismic data are recorded in the time domain. Reflections from geological strata are recorded and imaged by 

the amount of time it takes for waves to return to the surface after the seismic energy source has initiated a 

sound wave. The depth of any particular horizon is dependent upon the velocity at which the sound waves 

travel down through various rock types and back to the surface. Lacking data from previous drilling, significant 

uncertainty exists in estimating seismic velocities. As a result, the interpreted depth and geometry of targeted 

geologic formations are only approximate. 

While Lexam has endeavored to minimize the uncertainty by completing a 25 square mile 3D seismic survey 

in early 2007, the interpretation of 3D seismic data is still subject to significant uncertainties due to lateral and 

vertical changes in rock characteristics that affect seismic velocities. The interpretation of 3D seismic data is 

often an iterative process that includes initial interpretation, drilling and subsequent re-interpretation using 

velocity measurements obtained from geophysical logs of the well or wells that have been drilled. 

Vertical wells minimize exploration risks associated with the uncertainty in estimating depth in an area with little 

or no well control and to minimize the number of wells needed to definitively test the target during the early 

stages of exploration. A vertical well bore will intersect the target geologic formation at its true depth below the 

surface, even though that may be significantly different than the original interpreted depth. Wells drilled at a 

deviated angle add the risk of not encountering the target at the preferred location, potentially increasing the 

exploration time because of the need to drill additional wells. 

More importantly, the velocity control gained from vertical wells is superior to data gained from drilling deviated 

wells in that a vertical well will provide a discrete velocity function from the surface directly through the total 

depth of the well. Drilling vertical wells at both of the proposed locations will provide unique velocity functions 

at two points which can be used to define lateral variations in seismic velocities directly over the target. 

2-9 January 2008
Single-bend Double-bend Extended-reach Slant

Directional Drilling Patterns

Source: Short (1993)

U.S. Fish & Wildlife Service

Baca National Wildlife Refuge

Saguache and Alamosa Counties, Colorado

Figure: 2-2- Directional Drilling Patterns
2-11 January 2008

Observed lateral variations in seismic velocities can then be projected beyond the area of the two initial wells 

for the purpose of re-interpreting seismic data and generating new well plans. Inferior velocity control obtained 

during the early stages of exploration will continue to add uncertainty to subsequent drilling prognoses and well 

plans. 

Other concerns regarding directional drilling involve the simple fact that a deviated well will have a longer 

measured depth (MD) than the true vertical depth (TVD) of the target zone. In the case of the planned drilling, 

the nearest locations from which to drill outside the Refuge would be east of the proposed locations. The 

nearest surface location outside of the Refuge to the Baca #5 downhole location would be approximately 

11,000 feet away. Assuming the case of simple slant hole configuration, an additional 3,000 feet would have to 

be drilled. The actual borehole configuration would be more complex and result in additional drilling distances 

of more than 4,000 feet and MDs in excess of 18,000 feet. The consequences of the increased distance 

include, but would not be limited to, a larger rig, a larger drill pad (greater disturbance), more time needed to 

drill the well, more drill cuttings, and higher potential for hole problems (sticking drill pipe and drilling tools, 

inadequate ability to test potential zones, losing the hole). All of the preceding have direct cost consequences 

for the operator and have greater potential for environmental damage. Based on the foregoing, USFWS had 

determined directional drilling is not a technically or economically feasible alternative and has no identifiable 

environmental benefits in this case. 

2.5.3 Permit Only One Well 

Exploration for oil and gas in the San Luis valley has been very limited to date. No exploration wells have 

been drilled in the entire 25-square-mile area of the 3D seismic program acquired on the Refuge. Therefore, 

Lexam has made a number of interpretative assumptions to locate prospective oil and/or gas targets. Lexam 

believes drilling of the initial well will provide hard data regarding a number of the elements required for 

entrapment of oil or gas. It is highly likely that there will be significant changes in the interpretative model of 

the geology as a result of drilling the initial well. Therefore Lexam believes a second well will be required to 

test additional potential based upon the new information acquired from the initial well.

2.5.4 Deny Lexam Access 

The USFWS does not have the authority to deny Lexam, as legal owner of the separated mineral rights and 

party to a binding surface uses agreement, access to the Refuge to pursue recovery of its minerals. As 

mentioned above, Colorado property law allows the subsurface mineral owner to make reasonable and 

necessary use of the surface to explore for, develop, and produce its mineral interest. Any action by the 

USFWS to totally deny Lexam the reasonable opportunity to explore for minerals would likely be considered by 

Lexam an unconstitutional “taking” of their private property (mineral estate) without just compensation (U.S. 

Constitution, Amendment V). Therefore this alternative was considered and eliminated from detailed analysis. 
3.0 Affected Environment 

3.1 Introduction 

This EA analyzes USFWS’s adoption of standards and measures to ensure that Lexam’s planned exploration 

of the mineral estate underlying the Refuge does not unreasonably degrade or impact the USFWS surface 

estate and associated resources. As such, the sites of the exploration wells and existing and planned access 

roads constitute the project area (Figure 1-2). The larger approximately 16,246-acre area of the earlier 

seismic exploration by Lexam serves to provide the regional context for most of the “on the ground” resources 

(e.g., vegetation, wildlife, cultural resources, geology, etc.). The 16,000-acre seismic survey area is referred to 

as the project vicinity. Larger regional contexts are used as appropriate for resources such as air, 

groundwater, and visual resources. 

3.1.1 Baca Refuge 

The approved Refuge comprises 92,500 acres in Saguache and Alamosa counties in the San Luis Valley of 

south-central Colorado (Figure 1-1) (USFWS 2005). Situated in the San Luis Valley, a high mountain desert 

surrounded by two 14,000-foot mountain ranges, the Refuge contains a highly diverse suite of habitats 

including desert shrublands, grasslands, wet meadows, playa wetlands, and riparian areas. Fed largely by 

melting mountain snow, numerous streams crisscross the Refuge providing an abundance of life in an 

otherwise arid landscape. The Refuge is home to a multitude of wildlife and plant species. 

Congress authorized acquisition of land within the Refuge with passage of Public Law 106-530, also known as 

the “Great Sand Dunes National Park and Preserve Act of 2000.” This legislation, which received widespread 

support, focused not only on protecting the region's hydrology, which the unique sand dunes ecosystem 

depends upon, but also on protecting the ecological, cultural, and wildlife resources of the area. 

3.1.2 Project Area 

The planned access roads and two exploration wells will be located in the north central portion of the Baca 

Grant, generally in the southern portions of T43N, R11E NMPM (Figure 1-2). Lexam’s planned drilling is at an 

approximate elevation of 7,600 feet and is on a slight west-facing slope covered with shrubs. The project area 

is about 5,200 acres in size, compared to the seismic survey area of 16,246 acres and the Refuge, which 

contains 92,500 acres. The project area provides a 0.50-mile buffer around key elements of Lexam’s planned 

drilling program. 

3.2 Geology, Minerals, and Soils 

3.2.1 Geology 

The San Luis Valley is part of the much larger Rio Grande Rift Zone, which extends from southern New 

Mexico northward through the San Luis and Upper Arkansas Valleys to its northern termination near Leadville, 

Colorado (McCalpin 1996). The San Luis Valley is bordered on the east by the linear Sangre de Cristo 

Mountains, which resulted from extensive block faulting during the Laramide Orogeny (Figure 3-1). The west 

side of the valley is flanked by the San Juan Mountains, the result of extensive Tertiary-aged volcanism. In 

sharp contrast with the steeply faulted eastern side of the valley floor, the Oligocene volcanic rocks of the San 

Juan Mountains gently dip eastward into the valley floor where they are interbedded with valley-fill deposits. 

Valley-fill deposits consist of sedimentary rocks that inter-finger with volcanic deposits (McCalpin 1996). 

Quaternary deposits include pediments along the mountain fronts, alluvium, and sand dunes. 

3-1 January 2008
Sangre de Cristo Rang

San Juan Mountains e

Groundwater Divide

Rio Grande

Saguache Creek

San Luis River

Baca Graben

Alamosa Horst

Monte Vista Graben

Ancestral Sump

Saguache Saguache

Costilla Costilla

Conejos Conejos

Custer Custer

Alamosa Alamosa

Rio Grande Rio Grande

Huerfano Huerfano

Fremont Fremont

Las Animas Las Animas

U.S. Fish & Wildlife Service

Baca National Wildlife Refuge

Saguache and Alamosa Counties, Colorado

Figure: 3-1 -- Project Area General Geology

Map Location

Colorado

UTM ZONE 13

NAD 27

N 0 1 5 0 20

Miles

0 10 20 5

Kilometers

Legend

Proposed Well Site

Project Area

3D Seismic Survey Area

Baca NWR Acquisition Boundary

Great Sand Dunes NP

Acquisition Area

Fault

Quaternary Deposits

Tertiary Sandstone and Volcanics

Cretaceous Sandstone

Paleozoic Sediment/

Precambrian Crystalline
The project area is immediately underlain by Quaternary alluvium (Cappa and Wallace 2007). Below the 

alluvium are over 10,000 feet of sedimentary deposits of the Alamosa and Santa Fe Formations (Mayo et al. 

2006). These sediments consist of stream and lake deposits composed of sand, clay, and gravel. 

3.2.2 Minerals 

The most recent modern-day mining activities to have occurred in the general vicinity of Crestone, Colorado 

have been operations conducted by Battle Mountain Gold Company at its San Luis Mine, located some 

50-plus miles southeast of Crestone and in Costilla County, which ceased operations in late 1996; and, the 

former Summitville Mine which is located some 60-plus miles southwest of Crestone and in Rio Grande 

County. The Summitville Mine was operated by Galactic Resources, Inc. and ceased operations in late 1992. 

In the immediate vicinity of Crestone, the last recorded mining took place in the late 1800s (Sangres.com 

2007). Prospecting for gold and silver occurred throughout the immediate area in the Sangre de Cristo’s, and 

Crestone itself was founded at one of the locations where there was a small producing ore body. Production 

was sufficient to support the construction of a stamp mill at the location; however the mine soon played out. 

The major mineral commodities that are mined in the San Luis Valley vicinity are sand and gravel (Guilinger 

and Keller 2000). The nearest sand and gravel pits are located a couple of miles north of the Refuge in T44N, 

R11E. Other sand and gravel operations are scattered around the San Luis valley, and concentrated around 

the towns of Alamosa and Del Norte. Other minerals that are mined in the area include gold, silver, peat, and 

limestone. In 2006, there were no active mine permits issued or pending mine permits in Saguache County 

(Colorado Geological Survey 2007). Only 46 mining claims were recorded in the county compared with 5,693 

for the entire state. At present, no minerals are produced from the Refuge or project area. 

3.2.3 Soils 

The following provides a description of the soils present at the planned project components. 

3.2.3.1 Baca #5 and #6 Well Locations and Baca #5 Access Road 

The Baca #5 and Baca #6 wells and Baca #5 access road will be constructed on Laney loam (Soil Map 

Unit #42) (U.S. Department of Agriculture-Natural Resources Conservation Service [USDA-NRCS] 2007) 

(Figure 3-2). The Laney loam has 0 to 3 percent slopes and consists of very friable A horizons and stratified 

very strongly alkaline C horizons. Depth of the calcareous material ranges from 9 to 10 inches below ground 

surface. Laney soils reside on gently sloping flood plains and alluvial fans with slopes of 0 to 3 percent. They 

are well-drained with slow-to-medium runoff and moderate permeability. The Laney soil is considered erodible 

by wind (USDA-NRCS 1984). 

3.2.3.2 Baca #7 Well Location 

The Baca #7 location will be constructed on Mosca loamy sand, (Soil Map Unit #50) (USDA-NRCS 2007). The 

Mosca series has 0 to 3 percent slopes and consists of very deep, well drained soils that formed in mixed 

alluvium. They have low runoff and moderate permeability; Mosca loamy sand is highly erodible (USDA-NRCS 

1984). 

3.2.3.3 Baca #6 and #7 Access Road 

The access road to the Baca #6 and #7 locations crosses the Mosca loamy sand from the Lexam Road to 

approximately 1,000 feet north of the Baca #7 location (USDA-NRCS 2007). From there the road crosses the 

Laney loam (USDA-NRCS 2007) approximately 1,200 feet north of the Baca #7 location. The road then 

crosses onto the Laney loam for approximately 1,600 feet before it turns to the northeast and crosses onto 

Kerber loamy sand for a few hundred feet (Soil Map Unit #41). The Kerber loamy sand is highly erodible. 

3-3 January 2008
Lexam Road

County Road T

Count

71

32

79

72

72 46 71

14

50

32

42 37

63

46 65

33

42

41

32

46

70

72 46 70

32

71

32

71

71

42

71

32

71

32

41

63 32 63

46

46

46

70

71

32

79

82

46

50

16

63

16

41

42 79

71

70

8 10 7 9 12 11

Baca #6

Baca #7

Baca #5

U.S. Fish & Wildlife Service

Baca National Wildlife Refuge

Saguache and Alamosa Counties, Colorado

Figure 3-2 -- Project Area Soil Map Units

Map Location

Colorado

Legend

Proposed Well Site

Proposed Access Road

Soil Survey (SSURGO)

Project Area

Baca NWR Acquisition Boundary

3D Seismic Survey Area UTM ZONE 13

NAD 27

N 0 2,000 4,000 1,000

Feet

0 500 1,000 250

Meters
3.3 Air Resources 

3.3.1 Climate 

In the immediate area of the Refuge, summers are warm or hot on the valley floor and much cooler in the 

mountains. Winters are cold in the mountains, and valleys are colder than the lower slopes of adjacent 

mountains because of cold air drainage. Precipitation occurs in the mountains throughout the year, and a 

deep snowpack usually accumulates during the winter. Snowmelt usually supplies much more water than can 

be used for agriculture in the area. Precipitation in the valley in summer falls as showers, and some 

thunderstorms occur. In winter, the ground is covered with snow much of the time. Chinook winds, which 

blow downslope and are warm and dry, often melt and evaporate the snow (USDA-NRCS 1984). 

In winter the average temperature is 22 degrees Fahrenheit (°F), and the average daily minimum temperature 

is 7°F. The lowest temperature on record, which occurred in Saguache on January 7, 1971, is -34°F. In 

summer, the average temperature is 62°F, and the average maximum daily temperature is 80°F. The highest 

recorded temperature, which occurred on June 23, 1954, is 93°F. The total annual precipitation is 8.64 inches. 

Of this, 6 inches, or 70 percent, usually falls in April through September. In 2 years out of 10, the rainfall in 

April through September is less than 5 inches. The heaviest 1-day rainfall during the 1954-1978 period of 

record was 1.50 inches at Saguache on June 17, 1969. Thunderstorms occur on approximately 60 days each 

year, and most occur in summer (USDA-NRCS 1984). 

The average seasonal snowfall is 29 inches. The greatest snow depth at any one time during the period of 

record was 14 inches. On an average of 21 days, at least 1 inch of snow is on the ground. The number of 

such days varies greatly from year-to-year. 

The average relative humidity in mid-afternoon is approximately 40 percent. Humidity is higher at night, and 

the average at dawn is approximately 60 percent. The sun shines 80 percent of the time possible in summer 

and 60 percent in winter. The prevailing wind is from the southwest. The highest average wind speed 

(approximately 11 miles per hour), occurs in the spring (USDA-NRCS 1984). 

3.3.2 Air Quality 

Saguache County is predominantly agricultural and non-industrial. Major air emission sources include 

agriculture, biogenic, fires, vehicles (combustion and dust), and wood burning (CDPHE 2007) (Table 3-1). Air 

quality in the County could generally be described as good most times of the year. Other than vehicle and 

combustion sources for heating, there are no emission sources in the project area, except during periods when 

hay mowing occurs. 

Table 3-1 2005 Saguache County Emission Inventory (Tons per Year) 

Category CO NOx PM10 SO2 VOC Benzene 

Agriculture 0 0 1,048 0 0 0 

Biogenic 2,659 331 0 0 16,270 0 

Commercial Cooking 0 0 0 0 0 0 

Construction 0 0 151 0 0 0 

Forest and Prescribed Fire 1,011 32 146 9 71 5 

Fuel Combustion 3 8 0 1 0 0 

Highway Vehicles 1,994 192 6 6 121 5 

Non-Road 848 166 21 20 175 3 

3-5 January 2008
Table 3-1 2005 Saguache County Emission Inventory (Tons per Year) 

3-6

Category CO NOx PM10 SO2 VOC Benzene 

Road Dust 0 0 1,143 0 0 0 

Solvent Utilization 0 0 0 0 32 5 

Stationary Sources 0 0 30 0 9 0 

Structure Fires 0 0 0 0 0 0 

Surface Coating 0 0 0 0 4 0 

Woodburning 455 5 63 1 122 3 

Total 6,971 734 2,609 37 16,804 20 

CO – carbon monoxide 

NOx – nitrogen oxides 

SO2 – sulfer dioxide 

Source: CDPHE 2007b. 

3.4 Water Resources (Quantity and Quality) 

3.4.1 Surface Water 

The Refuge lies within a topographic basin referred to as the “Closed Basin” (Mayo et al. 2006). The lowest 

portion of the Closed Basin is known locally as the “Sump,” which occurs on part of the Refuge, but does not 

include the project area or project vicinity. The Closed Basin or Sump may have occurred in middle 

Pleistocene when the lake that filled the valley began to dry up, resulting in an environment of swamps and 

organic-rich sediments. Mayo et al. (2006) refer to the Closed Basin of Pleistocene time as the “ancestral 

sump.” Presently, the Closed Basin covers approximately 2,940 square miles in the northern part of the valley 

and is separated from the rest of the valley by a low alluvial fan. Water enters the Closed Basin through 

precipitation and snowmelt and exits primarily through evapotranspiration. The Closed Basin is composed of 

the San Luis and Saguache drainage basins (USEPA 2007a). The surface water in the basins generally flow 

into San Luis Creek, which flows generally to the south, and since there is no outlet, water is impounded in 

San Luis Lake and associated lakes in an area south of the Refuge. Although the project area is in the San 

Luis Creek drainage, the surface water flows into ephemeral playa lakes on the western border of the Refuge 

(Anderson 2007). 

USEPA water quality assessment data indicate that the surface water quality in the project area is fully 

supportive of the State Designated Use categories (agriculture, aquatic life warm water class 2, and recreation 

primary contact (USEPA 2007b). The analytical results for the baseline sampling of surface water can be 

found in Appendix E. 

3.4.2 Groundwater 

The project area is in the San Luis Valley portion of the Rio Grande Aquifer System. The San Luis Valley is the 

northernmost portion of the aquifer system that stretches from Saguache County, Colorado, to West Texas 

(Robson and Banta 1995). The project area is underlain by two relatively distinct aquifers, the unconfined or 

shallow aquifer and the confined or deep aquifer. The unconfined aquifer extends to a depth of 30 to 60 feet 

below the surface (Mayo et al. 2006). The upper unconfined aquifer is separated from the confined aquifer by 

a clay layer that is widespread across the subsurface of the San Luis Valley (Davey 2003). The confined 

aquifer ranges from 60 to over 4,500 feet below the surface (Mayo et al. 2006). Depth to the confined aquifer 

in the project area is expected to be between 100 and 200 feet below the surface. Mayo et al. (2006) have 

 January 2008
subdivided the confined aquifer in the San Luis Valley into three zones based on water chemistry. Where the 

unconfined aquifer comes to the surface, natural seeps, wet meadows, and inter-dune wetlands typically result 

(USFWS 2005). Below the unconfined aquifer are a number of clay-based layers that serve to separate, 

although not disconnect entirely, the unconfined aquifer from the deeper layers of sands and gravels 

containing water in the confined aquifer. The clay layers reduce upward movement of water from the confined 

aquifer creating water pressure. The unconfined aquifer is recharged by infiltration of irrigation waters, canal 

leakage, seepage from mountain streams that flow across permeable alluvial fans, and infiltration from 

precipitation. The confined aquifer is recharged from precipitation in the mountains and enters the aquifer at 

higher elevations in the mountains. Flow of groundwater in the upper unconfined aquifer is from northeast to 

southwest (Rupert and Plummer 2004). 

Groundwater quality in the San Luis Valley can be variable ranging from less than 500 milligrams per liter 

(mg/L) total dissolved solids (TDS) along the fringes to over 3,000 mg/L in the center of the basin (Robson and 

Banta 1994). However, reported TDS values in the unconfined aquifer in the northern valley have been 

reported as high as 35,000 mg/L according to Mayo et al. (2006), who concluded that “the elevated TDS of 

northern valley unconfined and upper active confined systems result from mineral dissolution, ion exchange 

and methanogenesis of organic and evaporate lake sediments deposited in an ancient lake.” The highest 

values of TDS in the unconfined aquifer are found in the San Luis Lakes area at the lowest portion of the 

Closed Basin, approximately 20 miles south of the planned project area. 

Groundwater quality impairment issues in the San Luis Valley include the presence of bacteria, toxic metals, 

and nitrate that have been detected in private domestic drinking water wells (USEPA 2007c). In response, the 

San Luis Valley Drinking Water Well Project was initiated in April 2007 and includes free testing of water from 

private wells and provides information on various water treatment techniques. 

TDS values in the planned project area are generally less than 500 mg/L based on groundwater baseline 

sampling analytical results (Figure 3-3) (Appendix E). However, TDS in the deeper wells in the area may 

exceed 500 mg/L. Groundwater in the San Luis Valley is characterized as calcium bicarbonate or magnesium 

bicarbonate (Robson and Banta 1995). A number of metals were analyzed in the samples, but no unusual 

concentrations of metals were detected (Appendix E). Concentrations of analyzed metals that are on the 

Colorado groundwater standards list did not exceed the standards (CDPHE 2007c). 

Organic parameters also were measured in the samples obtained for baseline analysis and included volatile 

organic compounds (VOCs), semi-volatile organic compounds (SVOCs), and hydrocarbon compounds 

(gasoline, diesel, methane, and ethane). No VOCs were detected in the baseline samples. However, a SVOC, 

bis(2-Ethylhexyl)phthalate, was found in several samples, but no other SVOCs were detected. The origin of 

bis(2-Ethylhexyl)phthalate in the samples is likely from sample contamination from plastic containers used for 

sample collection (Telesto 2007). Bis(2-Ethylhexyl)phthalate is commonly associated with plastics, but it is not 

very persistent in an aquatic environment (Howard 1989). 

The baseline sample analysis did not detect gasoline and diesel fuel; however, the lighter hydrocarbon gases 

methane and ethane were present. Methane was detected in 17 out of 20 wells that were sampled, and 

ethane was detected in 10 wells (Appendix E). Moreover, methane was detected in five of seven surface 

water samples. No ethane was detected in the surface water samples. The hydrocarbon gases likely 

originated from the decomposition of organic matter that accumulated in the “ancient sump” (Mayo et al. 2006). 

3.5 Vegetation and Habitats 

3.5.1 Vegetation Communities 

The Refuge is characterized by a diverse range of habitats including desert shrublands, grasslands, wet 

meadows, playa wetlands, and riparian areas (USFWS 2005). Specific vegetation communities (Figure 3-4) 

3-7 January 2008
Lexam Road

County Road T

County Road 66T

County Road 65 T 43 N

T 44 NR 10 E

R 11 E

T 44 NR 11 E

R 12 E

WC-W

WC-B5 WC-E

SC-W SC-E

S Crestone

Deadman

Cottonwood Well-2

Well-18

Well-15 Well-17

Well-14

SW-5 Domestic

Motel Well

FL-4

FL-3

C-7

C-57

C-27

C-25

C-24

C-23

C-22

C-18

375307

199723

Baca #6

Baca #7

Baca #5

U.S. Fish & Wildlife Service

Baca National Wildlife Refuge

Saguache and Alamosa Counties, Colorado

Figure: 3-3 -- Baseline Water Sampling Locations

Map Location

Colorado

Legend

Water Well Sampling

Location (Ground Water)

Surface Water Sampling Location

Proposed Well Site

Proposed Access Road

Project Area

Baca NWR Acquisition Boundary

3D Seismic Survey Area

Great Sand Dunes NP

Acquisition Boundary

UTM ZONE 13

NAD 27

N 012 0.5

Miles

012 0.5

Kilometers
County Road N

Coun

County Road T

ty Road 65

County Road 66T

Lexam Road

Baca

National

Wildlife

Refuge

3D Seismic

Survey Area

T 43 N

T 44 NR 10 E

R 11 E

T 44 NR 11 E

R 12 E

T 43 N

T 42 N

31 35 36 33 36 31 32 33 34 34 35

32

7

6

7 8 9 10 12 11

6 2 4 5 3 1

34 35 36 33

32

27 29 25 28 26

23 24 20 21 22

15 13

17

14 16

10 8 11

12

9

5 2 4 3 1

34 35 36

33

26 25

28

24

27

22

23

21

15 16

14 13

10 11 12

9

1 3

5

2 4

Baca #6

Baca #7

Baca #5

U.S. Fish & Wildlife Service

Baca National Wildlife Refuge

Saguache and Alamosa Counties, Colorado

Figure: 3-4 -- Vegetation Classification for the

 3D Seismic Region Survey Area

Map Location

Colorado

Legend

Proposed Well Site

Proposed Access Road

Project Area

3D Seismic Survey Area

Baca NWR Acquisition Boundary

Great Sand Dunes NP

Acquisition Area

NVCS Alliance Vegetation Classification

Redtop Intermittently Flooded Herbaceous Alliance

Saltgrass Intermittently Flooded Herbaceous Alliance

Rabbitbrush Shrubland Alliance

Baltic Rush Seasonally Flooded Herbaceous Alliance

Narrow-leaf Cottonwood Intermittently Flooded Herbaceous Alliance

Willow Temporarily Flooded Herbaceous Alliance

Greasewood Intermittently Flooded Sparsely Vegetated Alliance

Greasewood Shrubland Alliance

Alkali Sacaton Herbaceous Alliance

Bare ground / sparse vegetation

Intermittently flooded mud flats (i.e. playas, lakes)

Non-agriculture disturbed areas

Sand flats

Water

UTM ZONE 13

NAD 27

N

012 0.5

Miles

012 0.5

Kilometers
within these habitats were classified based on the International Vegetation Classification (Grossman et al. 

1998). Vegetation types were delineated based on review of aerial photography and ground-truthing surveys 

conducted by USFWS. Within the project vicinity, there are five general vegetation types: grasslands, 

shrubland, wet meadows/non-woody riparian areas, woody riparian areas, and playas. Table 3-2 summarizes 

the number of acres of each vegetation type present in this area. 

Table 3-2 Vegetation Types Present in the Project Area1

Vegetation Classes Acres 

Grasslands 292 

Shrubland 3,254 

Wet meadows/non-woody riparian areas 1,585 

Woody riparian areas 9 

Playas 19 

Total2 5,159 

1

Source: Grossman et al. 1998. 

2

Does not include open water, barren areas, sand flats, and developed areas that do not 

display vegetation characteristics. 

The most common vegetation types within the project area are shrublands and wet meadows/non-woody 

riparian areas. The wet meadows are wet during active runoff periods when native grasses and rushes are 

irrigated and grown primarily for water bird production. Open water, barren areas, sand flats, and developed 

areas accounts for less than 1 percent of the project area and do not display vegetation characteristics; 

consequently they are not discussed in this section of the EA. 

Table 3-3 provides a description of the vegetation types, sub-communities, and species commonly associated 

with these vegetation communities within the project vicinity. 

Table 3-3 Vegetation Types and Sub-communities that Occur in the Project Vicinity 

Vegetation Type Sub-community1 Common Species 

Grasslands • Alkali Sacaton 

Herbaceous Alliance 

Alkali sacaton, western wheatgrass, buffalograss, 

tansyaster, fourwing saltbush, scarlet globemallow, 

prairie coneflower, James’ galleta, bush muhly, little 

barley, Indian ricegrass, blue grama, seepweed, 

cholla cactus, and pricklypear cactus 

Shrubland • Rabbitbrush 

Shrubland Alliance 

• Greasewood 

Shrubland Alliance 

Rubber rabbitbrush, greasewood, four-wing 

saltbush, shadscale, winterfat, Indian ricegrass, 

Alkali sacaton, western wheat grass, blue grama, 

silver sagebrush, big sagebrush, broom snakeweed, 

yucca, pricklypear cactus, bluebunch wheatgrass, 

James’ galleta, spike dropseed, fewflower 

buckwheat, and clasping pepperweed 

3-10 January 2008
Table 3-3 Vegetation Types and Sub-communities that Occur in the Project Vicinity 

3-11

Vegetation Type Sub-community1 Common Species 

Wet Meadows/Nonwoody riparian areas • Baltic Rush 

Seasonally Flooded 

Herbaceous Alliance 

• Saltgrass 

Intermittently Flooded 

Herbaceous Alliance 

• Redtop Intermittently 

Flooded Herbaceous 

Alliance 

Baltic rush, redtop, foxtail barley, greasewood, alkali 

sacaton, Nuttall’s alkaligrass, sedges, tufted 

hairgrass, fleabane, bluebell, lupine, goldenrod, 

Junegrass, shrubby cinquefoil, and western 

wheatgrass 

Woody Riparian 

Areas 

• Willow Temporarily 

Flooded Shrubland 

Alliance 

Narrowleaf cottonwood, willows, red-oiser dogwood, 

and greasewood 

Playas • Greasewood 

Intermittently Flooded 

Sparsely Vegetated 

Alliance 

Greasewood, four-wing saltbush, saltgrass, alkali 

sacaton, spike-rush, and foxtail barley 

1

Source: Grossman et al. 1998; vegetation mapping was conducted by USFWS personnel. 

3.5.1.1 Wetland, Riparian, and Aquatic Habitats 

The Refuge contains a diversity of wetland types. According to the National Wetland Inventory (NWI) map 

produced by the USFWS, approximately 32 percent (1,309 acres) of the project area is classified as wetlands 

(see Table 3-4). Four types of wetlands and waters of the U.S. potentially occur: palustrine emergent, 

unconsolidated shore, aquatic bed, and lacustrine. These wetland and waters of the U.S. types are 

concentrated along the streams and playa areas located within the project area. The palustrine emergent and 

unconsolidated shore temporary and seasonal wetlands are referred to locally as wet meadows and nonwoody riparian areas. 

Table 3-4 Wetland Types Present in the Project Area1

Wetland Type Acres % 

PEM, Temporary 956 73.0 

PEM/PUS, Seasonal 352 26.8 

PEM, Semi-permanent 1 <1 

PAB, L2USC, Lake <1 <1 

Total2 1,309 100 

1

Source: USFWS 1990. 

2

Based on USFWS consultation and USFWS field surveys, the PSS NWI classification has been reclassified as shrubland habitat for 

this analysis. 

 January 2008
Wet Meadows/Non-woody Riparian Areas 

Wet meadows and non-woody riparian areas comprise the largest wetland type in the project area. Where the 

water table just reaches the soil surface during the early part of the growing season or inundates the surface 

for short periods is usually where this vegetation type is found. 

The majority of this vegetation type is found in the north, central, and western portions of the project area along 

Crestone, Spanish, and Willow creeks. Historically, the Refuge was managed as a working ranch under which 

creation and maintenance of this habitat type was perfected for utilization as high quality cattle forage. 

Current management of the wet meadows by the USFWS involves similar management and maintenance for 

use as migratory bird nesting, foraging and cover by actively flooding the meadows and haying in the fall in 

an attempt to promote the native plant communities. 

The dominant sub-community in this vegetation type is the Baltic Rush (Juncus balticus) Seasonally Flooded 

Herbaceous Alliance. The Baltic Rush Seasonally Flooded Herbaceous Alliance occupies seasonally flooded 

swales and wet, low- to mid-elevation sites, where habitats are often alkaline. The graminoid layer is dense 

with up to 98 percent cover, and dominated by Baltic rush. It is found throughout the project area. 

The two other communities that compose the wet meadows/non-woody riparian areas are the Saltgrass 

Intermittently Flooded Herbaceous Alliance and the Redtop (Agrostis gigantea) Intermittently Flooded 

Herbaceous Alliance. In the project area, the Saltgrass Intermittently Flooded Herbaceous Alliance occurs 

south of North Crestone Creek, while the Redtop (Agrostis gigantea) Intermittently Flooded Herbaceous 

Alliance sub-community is found along Willow Creek on the eastern edge. 

Woody Riparian Areas 

The project area has less than 1 percent of woody riparian habitat; this habitat is located along North Crestone 

Creek (USFWS 2005). There are no woody riparian vegetation communities near the planned well sites. 

This habitat type is composed of one sub-community, Willow (Salix spp.) Temporarily Flooded Shrubland 

Alliance is found north of North Crestone Creek. This community is usually found in the floodplains of the 

creeks, located on islands, sand or cobble bars, and immediate streambanks. It is tree-dominated with a 

diverse shrub component and is dependent on the natural hydrological regime, especially annual to episodic 

flooding. Narrowleaf cottonwood is the dominant tree species with understory vegetation of willows (Salix

spp.), red-oiser dogwood (Cornus stolonifera), and greasewood (USFWS 2005). 

Playas

Playas can experience weeks, months, or even years between periods of inundation. This vegetation type is 

found in small patches in the south- and north-central portions of the project area. This vegetation type is 

characterized by sparsely vegetated areas (<10 percent canopy cover), with typical species including 

greasewood and four-wing saltbrush (Atriplex canescens). Surrounding the playas is usually greasewood and 

rubber rabbitbrush (Ericameria nauseosa) with an understory of saltgrass and western wheat grass 

(Pascopyrum smithii). Barren salt flats also are a component of playa wetland systems. The only 

sub-community in this vegetation type is Greasewood Intermittently Flooded Sparsely Vegetated Alliance. It 

often occurs along flat to gently sloping stream terraces, where soils are alkaline and may be moderately 

saline. 

3.5.1.2 Upland Habitats 

Grasslands

Grasslands occur throughout the project area. This vegetation type is typically found in lowland and upland 

areas on swales, playas, mesa tops, plateau parks, alluvial flats, and plains. The only sub-community in this 

vegetation type is Alkali Sacaton (Sporobolus airoides) Herbaceous Alliance, which is widespread on the 

valley floor. A sparse to moderately dense graminoid layer of medium-tall bunch grasses with smaller densities 

3-12 January 2008
of short grasses and forbs characterize this sub-community, with alkali sacaton being the dominant grass. The 

access road to the Baca #5 location, and the location itself, are located within this vegetation type. 

Shrublands

Shrubland is the most dominant vegetation type in the project area, and is widespread on the valley floor. 

Many of the plants within this type are drought resistant and tolerant to a range of soil salinity, conditions 

common to the valley floor. The most dominant sub-community is the Rubber Rabbitbrush (Ericameria

nauseosa) Shrubland Alliance, usually characterized by open to moderately dense, short-shrub layer 

dominated by rubber rabbitbrush, big sagebrush, broom snakeweed (Gutierrezia sarothrae), sand sagebrush 

(Artemisia filifolia), pricklypear cactus (Opuntia spp.), yucca (Yucca spp.), Indian ricegrass, and blue grama. It 

is typically found on alluvial fans and flats with moderate to deep soils. This sub-community is dominant 

throughout the project area. The two access roads and Baca #6 and Baca #7 well sites are located within this 

vegetation sub-community. 

The Greasewood Shrubland Alliance is found mostly on the west side of the project area, with the dominant 

species being greasewood, four-wing saltbush, alkali sacaton, saltgrass, and spike-rush (Eleocharis palustris). 

This sub-community typically has saline soils, a shallow water table, and floods intermittently, but remains dry 

for most of the growing season. In both sub-communities, exotic species also are common including cheat 

grass (Bromus tectorum) and crested wheatgrass (Agropyron cristatum). 

3.5.2 Special Status Plant Species 

Special status species are those species for which state or federal agencies afford an additional level of 

protection by law, regulation, or policy. Included in this category are federally listed and federally proposed 

species that are protected under the Endangered Species Act or are considered as candidates for such listing 

by the USFWS, and those species that are state-listed as threatened or endangered. 

Within the project area, the globally rare Slender spiderflower (Cleome multicaulis) is the only rare plant 

species found. Slender spiderflower is an annual that inhabits saline or alkaline soils at the edge of wetlands or 

moist meadows, especially where the water table nears the surface. A member of the caper family, population 

size fluctuates considerably from year-to-year. The species was once found in suitable habitats in southcentral Colorado, and from southeastern Arizona to western Texas and to northern New Mexico, and one 

disjunct population was found in central Wyoming (Colorado Natural Heritage Program [CNHP] 2005). 

Drainage of wetlands throughout its range is thought to have decreased the amount of habitat available. This 

species now occurs almost exclusively in the San Luis Valley, commonly found in the transition area between 

the Baltic Rush Seasonally Flooded Herbaceous Alliance and the Rabbitbrush Shrubland Alliance, where it 

thrives in moist, slightly saline conditions (USFWS 2005). Sizeable populations of this rare plant are known to 

occur in the planned project area. 

3.5.3 Invasive and Noxious Weeds 

Subsequent to disturbance, vegetation communities may be susceptible to infestations of noxious species. 

These species are most prevalent in areas of prior surface disturbance, such as agricultural areas, roadsides, 

existing utility rights-of-way, and wildlife concentration areas. The prevention of the introduction or spread of 

noxious and invasive weeds is a high priority to federal, state and county agencies. Under Executive Order 

(EO) 13112 of February 3, 1999 - Invasive Species, federal agencies shall not authorize, fund, or carry out 

actions likely to cause or promote the introduction or spread of invasive species in the U.S. or elsewhere 

unless it has been determined that the benefits of such actions outweigh the potential harm caused by invasive 

species and that all feasible and prudent measures to minimize the risk of harm will be taken in conjunction 

with the actions. 

The terms “noxious weed” and “invasive weed” are often used interchangeably to describe any plant that is 

unwanted and grows or spreads aggressively. The term “noxious weed” is legally defined under both federal 

3-13 January 2008
and state laws. Under the Federal Plant Protection Act of 2000 (formerly the Noxious Weed Act of 1974 

[7 USC SS 2801-2814]), a noxious weed is defined as “any plant or plant product that can directly or indirectly 

injure or cause damage to crops, livestock, poultry, or other interests of agriculture, irrigation, navigation, the 

natural resources of the United States, the public health, or the environment” (Animal and Plant Health 

Inspection Service 2000; Institute of Public Law 1994). The Federal Plant Protection Act contains a list of 

137 federally restricted and regulated federal noxious weeds, as per CFR Title 7, Chapter III, Part 360, 

including 19 aquatic and wetland weeds, 62 parasitic weeds, and 56 terrestrial weeds. Each state is federally 

mandated to uphold the rules and regulations set forth by this Act and manage their lands accordingly. 

In addition to federal noxious weed lists, Colorado regulates noxious and invasive species through the 

Colorado Noxious Weed Act, which classifies noxious weeds into three lists, A, B, and C (§ 35 5.5-101 through 

119, CRS [2003]). Each list has specific control requirements, with the most stringent requirements for those 

species found on List A. Only List A species are required by law to be controlled (Colorado Department of 

Agriculture [CDA] 2006). The Alamosa County weed control board monitors local weed infestations and 

provides guidance on weed control. The species that are managed and regulated by the state and county 

agencies are included in Table 3-5. 

Plants of primary concern in the project area include Canada thistle (Cirsium arvense), perennial pepperweed 

(Lepidium latifolium), Russian knapweed (Acroptilon repens) and salt cedar (Tamarisk spp.), especially in the 

wetland and riparian habitats. Salt cedar is found primarily along the west side of the playa wetlands in 

disturbed areas, such as roads, in the project vicinity. Russian knapweed is primarily found in the northwest 

portion of the project area, while perennial pepperweed is found farther south and is often found in conjunction 

with Baltic rush communities. Yellow toadflax (Linaria vulgaris) has been reported in the Refuge. 

3.6 Wildlife and Fisheries 

3.6.1 Recreationally and Economically Important Species and Nongame Wildlife 

As discussed in Section 3.5, Vegetation and Habitats, wildlife habitat within the project vicinity consists 

primarily of semi-desert shrubland, semi-desert grassland, wet meadows, and non-woody riparian habitats. 

Semi-desert shrubland and semi-desert grassland are the most common wildlife habitats within the project 

area. The project vicinity is characterized by flat to low rolling terrain with intermittent streams, wet meadows, 

and wetlands. Baseline descriptions of both resident and migratory wildlife include species that have either 

been documented or that may occur in the project area based on habitat associations. Wildlife species are 

typical of the high mountain semi-desert shrublands of the San Luis Valley. Riparian/wetland habitats found 

along the drainages and ponds within the project vicinity support a greater diversity and population density of 

wildlife species than habitat types occurring in the project area. 

Information regarding wildlife species and habitat within the project area was obtained from a review of existing 

published sources, USFWS and Colorado Division of Wildlife (CDOW) file information, CNHP database 

information, and a site-specific biological assessment on the Baca Grande property 2 miles east of the planned 

project area (CNHP 2006). The biological assessment is relevant due to its close proximity to the project area 

and information on special status wildlife species in the San Luis Valley. The survey was conducted by the 

CNHP in the summer of 2005 and examined the existing use of the Baca Grande by terrestrial and aquatic 

vertebrates and special status species. 

3.6.1.1 Big Game 

Elk, mule deer, and pronghorn are the primary big game species within the project area (CDOW 2007g). The 

project area occurs in game management unit 82. In 2006, a total of 393 elk, 81 mule deer, and 120 pronghorn 

were harvested in unit 82 (CDOW 2007d). Details on each big game species are presented below. 

3-14 January 2008
Table 3-5 Noxious Weeds Potentially Occurring within the Project Area 

Common Name Scientific Name 

Federal 

List1

Colorado 

Noxious 

Weed List2

Alamosa 

County 

Noxious 

Weed List3

Primary 

Concern 

for the 

Refuge 

Velvetleaf Abutilon theophrasti C 

Russian knapweed Acroptilon repens B X X 

Jointed goatgrass Aegilops cylindrica C 

Camelthorn Alhagi pseudalhagi A 

Spurred anoda Anoda cristata B 

Corn chamomile Anthemis arvensis B 

Mayweed chamomile Anthemis cotula B 

Common burdock Arctium minus C 

Absinth wormwood Artemisia absinthium B 

Downy brome Bromus tectorum C 

Hoary cress Cardaria draba B X X 

Plumeless thistle Carduus acanthoides B 

Musk thistle Carduus nutans B 

Wild caraway Carum carvi B 

Diffuse knapweed Centaurea diffusa B 

Spotted knapweed Centaurea maculosa B 

Meadow knapweed Centaurea pratensis A 

Yellow starthistle Centaurea solstitialis A 

Squarrose knapweed Centaurea virgata A 

Rush skeletonweed Chondrilla juncea A 

Oxeye daisy Chrysanthemum 

leucanthemum 

B 

Chicory Cichorium intybus C 

Canada thistle Cirsium Arvense B X X 

Bull thistle Cirsium vulgare B 

Chinese clematis Clematis orientalis B 

Poison hemlock Conium maculatum C 

Field bindweed Convolvulus arvensis C X 

Common crupina Crupina vulgaris X A 

Houndstongue Cynoglossum officinale B 

Yellow nutsedge Cyperus esculentus B 

3-15 January 2008
Table 3-5 Noxious Weeds Potentially Occurring within the Project Area 

3-16

Common Name Scientific Name 

Federal 

List1

Colorado 

Noxious 

Weed List2

Alamosa 

County 

Noxious 

Weed List3

Primary 

Concern 

for the 

Refuge 

Common teasel Dipsacus fullonum B 

Cutleaf teasel Dipsacus laciniatus B 

Russian-olive Elaeagnus angustifolia B 

Quackgrass Elytrigia repens B 

Redstem filaree Erodium cicutarium B 

Cypress spurge Euphorbia cyparissias A 

Leafy spurge Euphorbia esula B 

Myrtle spurge Euphorbia myrsinites A 

Halogeton Halogeton glomeratus C 

Dame's rocket Hesperis matronalis B 

Venice mallow Hibiscus trionum B 

Orange hawkweed Hieracium aurantiacum A 

Hydrilla Hydrilla verticillata X A 

Black henbane Hyoscyamus niger B 

Common St. Johnswort Hypericum perforatum C 

Dyer's woad Isatis tinctoria A 

Perennial pepperweed Lepidium latifolium B X X 

Sericea lespedeza Lespedeza cuneata A 

Dalmatian toadflax, broadleaved Linaria dalmatica B 

Dalmatian toadflax, narrowleaved Linaria genistifolia B 

Yellow toadflax Linaria vulgaris B 

Purple loosestrife Lythrum salicaria A 

Scentless chamomile Matricaria perforata B 

Eurasian watermilfoil Myriophyllum spicatum B 

Scotch thistle Onopordum acanthium B 

Scotch thistle Onopordum tauricum B 

Wild proso millet Panicum miliaceum C 

African rue Peganum harmala A 

Sulfur cinquefoil Potentilla recta B 

 January 2008
Table 3-5 Noxious Weeds Potentially Occurring within the Project Area 

3-17

Common Name Scientific Name 

Federal 

List1

Colorado 

Noxious 

Weed List2

Alamosa 

County 

Noxious 

Weed List3

Primary 

Concern 

for the 

Refuge 

Mediterranean sage Salvia aethiopis A 

Giant salvinia Salvinia molesta X A 

Bouncingbet Saponaria officinalis B 

Tansy ragwort Senecio jacobaea A 

Perennial sowthistle Sonchus arvensis C 

Johnsongrass Sorghum halepense C 

Medusahead Taeniatherum caputmedusae A 

Salt Cedar Tamarisk spp. B X X 

Common tansy Tanacetum vulgare B 

Puncturevine Tribulus terrestris C 

Moth mullein Verbascum blattaria B 

Common mullein Verbascum thapsus C 

1

Each state is federally mandated to uphold the rules and regulations set forth by the Federal Plant Protection Act of 2000 (formerly the 

Noxious Weed Act of 1974 [7 USC SS 2801-2814]). 

2

In the Colorado Noxious Weed Act (§ 35 5.5-101 through 119, CRS [2003]), noxious weeds are classified into three lists, A, B, and C. 

Each list has specific control requirements, with the most stringent requirements for those species found on List A. List A includes 

noxious weeds targeted for eradication and for which management plans have been developed for their control. Control of these 

species is required by law. If these species were found within the project area, Lexam will be required to follow the prescribed 

management techniques stipulated by Colorado’s Noxious Weed Act. These techniques must be applied for the duration of the seed 

longevity for the particular species. List B species are recommended for control, but management plans have not yet been developed 

for these species and control is not required by law. List C species are generally considered too widespread to effectively control, and 

control of List C species is not required (CDA 2006). 

3

A county noxious weed list is not available for Saguache county. 

Sources: CDA 2006. 

 January 2008
A large herd of resident elk occurs within the vicinity of the project area. Elk use a variety of habitat types 

within the project area but primarily occur in wet meadows and shrub-dominated habitats (USFWS 2005). Elk 

populations within the project area usually peak during winter months (November-March), with populations 

highest during severe winters (USFWS 2005). The entire project area is considered summer range, while the 

eastern portion of the project area is considered severe winter range (CDOW 2007g). Two small areas located 

in the eastern portion of the project area are considered winter concentration areas by CDOW. These areas 

occur along Crestone, Cottonwood, Spanish, and Willow creeks (CDOW 2007g). Figure 3-5 presents the 

designated elk winter range located within the project area. 

Mule deer are typically found in riparian areas and abandoned agricultural fields (USFWS 2005). The eastern 

portion of the project area is considered winter range (CDOW 2007g). Figure 3-6 presents the designated 

mule deer winter range located within the project area. 

Pronghorn occur throughout the project area year-round. Use of the project area by pronghorn is highly 

dependent on water and forage availability. The entire project area is considered pronghorn winter range 

(CDOW 2007g). A small area located in the northern portion of the project area is considered a winter 

concentration area by CDOW (CDOW 2007g). Figure 3-7 presents the designated pronghorn winter range 

located within the project area. 

Big game population numbers fluctuate slightly from year-to-year based on weather and habitat conditions. 

Water availability and the amount of quality winter habitat are the limiting factors within the project area. Water 

availability, forage quality, cover, and weather patterns typically determine the level of use and movement of 

big game species through the project area. 

Mountain lion and black bear also are classified as big game species in Colorado (CDOW 2007d). Both of 

these species are fairly common in south-central Colorado and occupy the higher elevations of the Sangre de 

Cristo mountain range east of the project area (Fitzgerald et al. 1994). Due to the lack of preferred habitat 

(i.e., canyons, mesas, brushy hillsides), occurrence within the project area by these species would be limited 

to dispersing individuals. 

3.6.1.2 Small Game and Furbearers 

Small game species that occur within the project area are mourning dove, cottontail, and white-tailed jackrabbit 

(USFWS 2005). Currently, there are no upland game birds other than mourning dove found within the project 

area due to the absence of suitable habitat. Mourning doves are found in a wide range of habitats in close 

proximity to water and are most likely to occur within the project area during spring, summer, and early fall. 

Furbearers that may occur within the project area include the coyote, badger, red fox, bobcat, beaver, muskrat, 

skunk, and raccoon (Fitzgerald et al. 1994). 

The project area contains important nesting habitat for waterfowl as well as important staging habitats that are 

utilized during migration (USFWS 2005). Common species found within the project area include Canada 

goose, mallard, Northern pintail, gadwall, American wigeon, cinnamon, green-winged and blue-winged teal 

(USFWS 2005). Waterfowl are found throughout the project vicinity in appropriate habitats such as wetlands, 

ponds, wet meadows, and riparian areas. 

3.6.1.3 Nongame Species 

A diversity of nongame species (e.g., small mammals, passerines, raptors, and reptiles) occupy a wide range 

of trophic levels and habitat types within the project area. Habitats (e.g., semi-desert shrublands, wet 

meadows) support a variety of resident and seasonal nongame species. Nongame mammals include such 

species as deer mouse, silky pocket mouse, meadow vole, Ord’s kangaroo rat, thirteen-lined ground squirrel, 

Gunnison’s prairie dog, and northern pocket gopher (USFWS 2005). The Gunnison’s prairie dog is uncommon 

and is only found in small colonies in the San Luis Valley and south-central Colorado (Fitzgerald et al. 1994). 

3-18 January 2008
County Road N

Lexam Road

County Road T

County Road 65

County Road 66T

Baca

National

Wildlife

Refuge

3D Seismic

Survey Area

T 43 N

T 44 NR 10 E

R 11 E

T 44 NR 11 E

R 12 E

T 43 N

T 42 N

31 35 36 33 36 31 32 33 34 34 35

32

7

6

7 8 9 10 12 11

6 5 4 3 2 1

34 35 36 33

32

27 29 25 28 26

23 24 20 21 22

15 13

17

14 16

10 8 11

12

9

5 2 4 3 1

34 35 36

33

26 25

28

24

27

22

23

21

15 16

14 13

10 11 12

9

1 3

5

2 4

Baca #6

Baca #7

Baca #5

U.S. Fish & Wildlife Service

Baca National Wildlife Refuge

Saguache and Alamosa Counties, Colorado

Figure: 3-5 -- Designated Elk Winter Range

Map Location

Colorado

Legend

Proposed Well Site

Proposed Access Road

Elk Winter Concentration Area

Elk Severe Winter Range

Project Area

3D Seismic Survey Area

Baca NWR Acquisition Boundary

Great Sand Dunes NP

Acquisition Boundary

UTM ZONE 13

NAD 27

N 012 0.5

Miles

012 0.5

Kilometers
County Road N

Lexam Road

County Road T

County Road 66T

County Road 65

Baca

National

Wildlife

Refuge

3D Seismic

Survey Area

T 43 N

T 44 NR 10 E

R 11 E

T 44 NR 11 E

R 12 E

T 43 N

T 42 N

31 35 36 33 36 31 32 33 34 34 35

32

7

6

7 8 9 10 12 11

6 2 4 5 3 1

34 35 36 33

32

27 29 25 28 26

23 24 20 21 22

15 13

17

14 16

10 8 11

12

9

5 2 4 3 1

34 35 36

33

26 25

28

24

27

22

23

21

15 16

14 13

10 11 12

9

1 3

5

2 4

Baca #6

Baca #7

Baca #5

U.S. Fish & Wildlife Service

Baca National Wildlife Refuge

Saguache and Alamosa Counties, Colorado

Figure: 3-6 -- Designated Mule Deer Winter Range

Map Location

Colorado

Legend

Proposed Well Site

Proposed Access Road

Mule Deer Severe Winter Range

Mule Deer Winter Range

Project Area

3D Seismic Survey Area

Baca NWR Acquisition Boundary

Great Sand Dunes NP

Acquisition Boundary

UTM ZONE 13

NAD 27

N 012 0.5

Miles

012 0.5

Kilometers
County Road N

County Road T

County Road 65

Lexam Road

County Road 66T

Baca

National

Wildlife

Refuge

3D Seismic

Survey Area

T 43 N

T 44 NR 10 E

R 11 E

T 44 NR 11 E

R 12 E

T 43 N

T 42 N

31 35 36 33 36 31 32 33 34 34 35

32

7

6

7 8 9 10 12 11

6 2 4 5 3 1

34 35 36 33

32

27 29 25 28 26

23 24 20 21 22

15 13

17

14 16

10 8 11

12

9

5 2 4 3 1

34 35 36

33

26 25

28

24

27

22

23

21

15 16

14 13

10 11 12

9

1 3

5

2 4

Baca #6

Baca #7

Baca #5

U.S. Fish & Wildlife Service

Baca National Wildlife Refuge

Saguache and Alamosa Counties, Colorado

Figure: 3-7 -- Designated Pronghorn Winter Range

Map Location

Colorado

Legend

Proposed Well Site

Proposed Access Road

Pronghorn Winter Concentration Area

Pronghorn Winter Range

Project Area

3D Seismic Survey Area

Baca NWR Acquisition Boundary

Great Sand Dunes NP

Acquisition Boundary

UTM ZONE 13

NAD 27

N 012 0.5

Miles

012 0.5

Kilometers
The USFWS is currently preparing a 12-month finding on a petition to list the Gunnison’s prairie dog as 

threatened or endangered under the Endangered Species Act of 1973 (USFWS 2007a) The northern pocket 

gopher is a Colorado species of concern and is discussed in detail in Section 3.6.2, Special Status Wildlife 

Species. Small mammals provide a substantial prey base for the areas predators including mammals (e.g., 

coyote, badger, skunk), raptors (eagles, hawks, falcons, owls), and reptile species. Representative birds that 

occur within the project area are discussed below in Section 3.6.4, Migratory Birds. 

Several bat species may occur within the project area including Brazilian free-tailed bat, western small-footed 

myotis, long-eared myotis, long-legged myotis, hoary bat, and Townsend’s big-eared bat (Fitzgerald et al. 

1994). The Townsend’s big-eared bat is a Colorado species of concern and is discussed in detail in 

Section 3.6.2, Special Status Wildlife Species. 

The project area contains important nesting habitat for shorebirds and waterbirds as well as important staging 

habitats that are utilized during migration (USFWS 2005). Common species found within the project area 

include greater sandhill crane, greater and lesser yellowlegs, American avocet, white-faced ibis, Wilson’s 

phalarope, snipe, sora, and Virginia rail. Shorebirds and waterbirds are found throughout the project area in 

appropriate habitats such as wetlands, ponds, wet meadows, and riparian areas. 

Other important nongame species that are found within the project area include several species of reptiles and 

amphibians. These species include the short-horned lizard, bull snake, western garter snake, tiger 

salamander, chorus frog, Great Plains toad, woodhouse’s toad, Plains spadefoot toad, and northern leopard 

frog (CDOW 2007b; CNHP 2006; USFWS and Lexam Explorations 2007; USFWS 2005). The northern 

leopard frog is a Colorado species of concern and is discussed in Section 3.6.2, Special Status Wildlife 

Species. 

3.6.1.4 Migratory Birds 

Nongame birds within the project region include a wide range of migratory bird species including neotropical 

migrants - birds that breed in North America and winter in the neotropical region of South America. These birds 

are considered integral to natural communities and act as environmental indicators based on their sensitivity to 

environmental changes caused by human activities. Representative bird species breeding in the project region 

include yellow warbler, song sparrow, western wood pewee, black-billed magpie, American crow, western 

meadowlark, and a number of raptor species (see below) [Garcia 2007; USFWS and Lexam Explorations 

2007; USFWS 2005]. Migratory birds are protected under the MBTA (16 USC 703 711) and EO 13186, 

Responsibilities of Federal Agencies to Protect Migratory Birds (66 Federal Register 3853). 

The San Luis Valley hosts an array of hawks, falcons, owls, and eagles throughout the year. Abundant food 

sources (e.g., rodents, waterfowl) are found throughout the numerous wetlands, wet meadows, ponds, lakes, 

and streams that occur in the San Luis Valley (USFWS and Lexam Explorations 2007). Details on raptor 

species found within the project vicinity are presented below. 

Prairie falcons are common year-round residents within the project area and use various habitats extensively 

for feeding and resting. Red-tailed hawks, Swainson’s hawks, and American kestrels nest in the vicinity of the 

project area, primarily in trees and snags scattered along creeks and water delivery canals (Garcia 2007; 

USFWS and Lexam Explorations 2007). 

Northern harriers and short-eared owls likely nest in dense vegetation found in wet meadows and marshes 

(Garcia 2007; USFWS and Lexam Explorations 2007). Great horned and long-eared owls likely nest in the 

project vicinity in deciduous trees found along riparian areas and are likely to occur in the banks of incised 

creeks and water delivery ditches (USFWS and Lexam Explorations 2007). 

Species such as ferruginous hawk, rough-legged hawk, northern harrier, short-eared owl, and golden and bald 

eagles are common winter residents within the project area (USFWS and Lexam Explorations 2007). The 

hawks, owls, and golden eagles forage for rodents, small mammals, and other prey in riparian areas, uplands, 

3-22 January 2008
and short-emergent wetlands where cover is abundant. Details on the bald eagle, peregrine falcon, and 

ferruginous hawk are discussed in Section 3.6.2, Special Status Wildlife Species. 

Passerine or songbird species occupy the entire range of habitats found within the project area. However, due 

to the higher level of plant diversity and structure, more abundant potential nest sites, and greater food base, 

the riparian areas and wetlands support the highest diversity of bird species within the seismic survey area. 

Details on sensitive species such as southwestern willow flycatcher, western yellow-billed cuckoo, mountain 

plover, and long-billed curlew will be discussed further in Section 3.6.2, Special Status Species. 

3.6.1.5 Fisheries 

Crestone Creek is inhabited by four native fish species: Rio Grande sucker (Catostomus plebeius), Rio 

Grande chub (Gila pandora), fathead minnow (Pimephales promelas), and longnose dace (Rhinichthys

cataractae) [USFWS and Lexam Explorations 2007]. The Rio Grande sucker and Rio Grande chub are 

discussed in detail in Section 3.6.2, Special Status Wildlife Species 

3.6.2 Special Status Species 

Special status species are those species for which state or federal agencies afford an additional level of 

protection by law, regulation, or policy. Included in this category are federally listed species that are protected 

under the ESA, species designated as state endangered or threatened by CDOW, and state species of 

concern identified by CDOW. 

In July 2007, the USFWS issued a letter of Concurrence with the Determination of No Effect for all federally 

listed species including southwestern willow flycatcher and Canada lynx for the project area. The following 

discussion summarizes known data for the sensitive wildlife species identified for the project area by the 

applicable agencies. 

A total of 27 special status species (20 terrestrial and 7 aquatic) were identified as potentially occurring within 

the project area (CDOW 2007e; CNHP 2007; USFWS 2007c). These species, their associated habitats, and 

their potential for occurrence within the project area are summarized in Table 3-6. Occurrence potential within 

the project area and cumulative effects area was evaluated for each species based on their habitat 

requirements and/or known distribution. Based on these evaluations, 10 special status species have been 

eliminated from detailed analyses based on their habitat requirements and/or known distributions (Table 3-6). 

These species include wolverine, lynx, Gunnison’s sage grouse, Mexican spotted owl, boreal toad, 

Uncompahgre fritillary butterfly, bonytail, razorback sucker, humpback chub, and Colorado pikeminnow. The 

17 special status species identified as potentially occurring within the project area are described below. 

3.6.2.1 Mammals 

Townsend’s big-eared Bat (SC). The Townsend’s big-eared bat (Plecotus townsendii) occurs throughout 

Colorado but is largely absent for the eastern plains (Fitzgerald et al. 1994). This species is most commonly 

found in desert shrublands, pinyon-juniper woodlands, and open montane forests (Fitzgerald et al. 1994).This 

species is highly associated with caves and mines. The Townsend’s big-eared bat is very susceptible to 

disturbance at roost sites (Fitzgerald et al. 1994). This species periodically moves to alternate roosts and 

actively forages and drinks throughout the winter. Common foraging associations include edge habitats along 

streams, adjacent to and within a variety of wooded habitats (Fitzgerald et al. 1994). Although this species has 

not been documented within the project area (Garcia 2007), suitable foraging habitat occurs within the project 

area. The potential for this species to occur within the project area is considered moderate. 

3-23 January 2008
Table 3-6 Special Status Species Identified for the Environmental Assessment of Lexam’s 

Planned Oil and Gas Exploration 

Common 

Name/ 

Scientific 

Name Status1 

Range 

Habitat Requirements 

Potential for Occurrence 

on or Near the Project 

Area 

Eliminated 

from 

Detailed 

Analysis 

MAMMALS 

Townsend’s 

big-eared bat 

Corynorhinus 

townsendii 

SC Range: Occurs throughout the western 

U.S. 

Habitat: Highly associated with caves 

and mines. Very susceptible to 

disturbance at roost sites. Periodically 

moves to alternate roosts and actively 

forages and drinks throughout the winter. 

Foraging associations include edge 

habitats along streams, adjacent to and 

within a variety of wooded habitats. 

Moderate. Suitable foraging 

habitat exists within the project 

area. 

No. 

Northern 

pocket gopher 

Thomomys 

talpoides 

agrestis 

SC Range: This subspecies occurs in the 

San Luis Valley north and east of the Rio 

Grande River. 

Habitat: A wide variety of vegetation 

communities including semidesert 

shrublands, grasslands, forests, and 

alpine tundra. 

High. This species has been 

documented approximately 2 

miles east of the project area 

on the Baca Grande. 

No. 

Black-footed 

ferret 

Mustela 

nigripes 

FE, SE Range: Isolated locations in South 

Dakota, Wyoming, Utah, and Colorado. 

Habitat: Prairie dog colonies. Uses the 

burrows as living quarters and nurseries. 

Low. Suitable habitat occurs 

within Gunnison’s prairie dog 

colonies within the project 

area. However, the nearest 

known population is located in 

northwest Colorado. 

Yes 

Wolverine 

Gulo gulo 

SE Range: Throughout boreal forest and 

tundra regions of North America. Several 

historical records exist for Colorado, 

although their status is currently 

unknown. 

Habitat: Boreal forests, bogs, lowlands, 

and tundra. Dens are typically in log 

jams, under rocks and boulders, or under 

tree roots. 

None. Yes. Lack of 

suitable 

habitat occurs 

within the 

project area. 

3-24 January 2008
Table 3-6 Special Status Species Identified for the Environmental Assessment of Lexam’s 

Planned Oil and Gas Exploration 

3-25

Common 

Name/ 

Scientific 

Name Status1 

Range 

Habitat Requirements 

Potential for Occurrence 

on or Near the Project 

Area 

Eliminated 

from 

Detailed 

Analysis 

Lynx 

Lynx 

canadensis 

FT, SE Range: Found throughout Canada and 

Alaska as well as the high elevation 

forests of Colorado, Utah, Wyoming, 

Montana, and Idaho. 

Habitat: Coniferous forests such as 

spruce-fir with well-developed 

understories. Uneven aged stands of 

spruce-fir with rock outcrops and large 

boulders is the preferred habitat. Dens 

are typically under ledges, trees, 

deadfalls, or occasionally in caves. 

None. Yes. Lack of 

suitable 

habitat occurs 

within the 

project area. 

BIRDS 

Bald eagle 

Haliaeetus 

leucocephalus 

ST Range: Throughout Colorado, however 

most breeding occurs along the front 

range and western portion of the state. 

Habitat: Generally nests and roosts in 

close proximity to large water bodies 

including rivers, lakes, and reservoirs. 

Nests in large trees such as cottonwood 

and ponderosa pine. Breeding season is 

February 15-July 15. 

Moderate. Occurrence is 

limited to migrating and 

wintering individuals. Most of 

the bald eagle use is along 

Crestone Creek northeast of 

the project area. 

No. 

Ferruginous 

hawk 

Buteo regalis 

SC Range: Throughout the Great Plains and 

grassland/shrub-steppe areas of western 

North America. 

Habitat: Open grassland and shrubsteppe habitats. Nests on the ground, 

usually on a hill or rock outcrop. Forages 

over open country. Breeding season is 

March 15-July 15. 

High. This species has been 

documented nesting in the 

vicinity of the project area. 

No. 

American 

Peregrine 

Falcon 

Falco 

peregrinus 

anatum 

SC Range: Primarily found in western 

Colorado but breeding pairs also are 

found along the front range. 

Habitat: Foothill and mountain cliffs 

surrounded by pinyon-juniper or 

ponderosa pine woodlands. Nest sites 

consist of a small depression on a cliff 

ledge. Breeding season is March 15-July 

15. 

High. This species has been 

documented foraging around 

wetlands and marshes within 

the project area. However, no 

known nesting habitat occurs 

within the vicinity of the project 

area. 

No. 

 January 2008
Table 3-6 Special Status Species Identified for the Environmental Assessment of Lexam’s 

Planned Oil and Gas Exploration 

3-26

Common 

Name/ 

Scientific 

Name Status1 

Range 

Habitat Requirements 

Potential for Occurrence 

on or Near the Project 

Area 

Eliminated 

from 

Detailed 

Analysis 

Gunnison 

sage-grouse 

Centrocercus 

minimus 

SC Range: In Colorado, this species is found 

primarily in Gunnison county with small 

scattered populations in Montrose, San 

Miguel, Mesa and Saguache counties. 

Habitat: Sagebrush grasslands. Leks are 

located in open areas in close proximity 

to escape cover. Nests are located in 

sagebrush habitat, typically within 2 miles 

of the lek. Broods are raised in wet, 

grassy areas near sagebrush. Winter 

habitat consists of south and east facing 

slopes with minimal snow cover. 

Breeding season is March 15-July 1. 

None. Yes. The 

nearest 

population is 

a small 

introduced 

population 

restricted to 

an area 

approximately 

25 miles 

northwest of 

the project 

area. 

Greater No. 

sandhill crane 

Grus 

canadensis 

tabida 

SC Range: In Colorado, this species breeds 

in the northwest portion of the state and 

migrates through the San Luis Valley in 

the fall and spring. 

Habitat: Flooded fields, wetlands, 

marshes, meadows, and agricultural 

fields. Breeding season is April 1-July 15. 

High. A large number of 

greater sandhill cranes, part of 

the Rocky Mountain 

population, migrate through 

the San Luis Valley in the fall 

and spring. 

Western 

snowy plover 

Charadrius 

alexandrinus 

SC Range: Found along manmade 

reservoirs in southeast Colorado and 

alkali-covered playas in the San Luis 

Valley. 

Habitat: Sandy beaches, dry salt flats, 

river bars, and alkali covered playas. 

Breeding season is April 1-July 15. 

High. This species has been 

documented approximately 15 

miles south of the project area 

near San Luis Lake. 

No. 

Mountain 

plover 

Charadrius 

montanus 

SC Range: Western North America with the 

largest breeding populations found in 

Colorado and eastern Montana. 

Habitat: Native short-grass prairie, 

stunted shrublands, agricultural fields, 

and overgrazed pastures. Breeding 

season is April 1-July 15. 

High. Very few records exist 

for the San Luis Valley 

although this species was 

observed east of the project 

area on the Baca Grande in 

2005. Suitable habitat occurs 

within the project area. 

No. 

 January 2008
Table 3-6 Special Status Species Identified for the Environmental Assessment of Lexam’s 

Planned Oil and Gas Exploration 

3-27

Common 

Name/ 

Scientific 

Name Status1 

Range 

Habitat Requirements 

Potential for Occurrence 

on or Near the Project 

Area 

Eliminated 

from 

Detailed 

Analysis 

Long-billed 

curlew 

Numenius 

americanus 

SC Range: Found primarily in southeastern 

Colorado with isolated populations in the 

northeast and northwest Colorado. 

Habitat: Short-grass prairie with scattered 

playas. Feeds along lake and reservoir 

edges during migration. Breeding season 

is April 1-July 15. 

Moderate. This species has 

been documented migrating 

through the project area. 

Suitable nesting habitat occurs 

within the project area. 

No. 

Western No. 

yellow-billed 

cuckoo 

Coccyzus 

americanus 

FC; SC Range: In Colorado, this species is 

primarily found west of the continental 

divide along riparian areas. 

Habitat: Old growth riparian woodlands 

with dense understories. Nests are 

typically located high in trees with closed 

canopies. Breeding season is April 15-

July 15. 

Low. This species has been 

documented in dense, oldgrowth cottonwood forests on 

McIntire Springs approximately 

35 miles south of the project 

area. Suitable habitat occurs in 

the vicinity of the project area. 

Mexican 

spotted owl 

Strix 

occidentalis 

lucida 

FT, ST Range: In Colorado, this species is found 

in the south-central and southwest 

portions of the state. 

Habitat: In south-central Colorado, this 

species prefers deep rocky canyons with 

tall old growth conifers such as white pine 

and Douglas fir. In southwest Colorado, 

this species is found in narrow slick-rock 

canyons that cut through pinyon-juniper 

woodlands. Breeding season is March 

15-July 15. 

None. Yes. Lack of 

suitable 

habitat (i.e., 

deep rocky 

canyons with 

tall conifers) 

occurs within 

the project 

area. 

Burrowing owl 

Athene 

cunicularia 

ST Range: Found primarily in eastern 

Colorado as a summer resident although 

small populations occur in the western 

Colorado and the San Luis Valley. 

Habitat: Open country from desert scrub 

to grasslands. Often found in or around 

prairie dog colonies. Nests in burrows. 

Breeding season is March 15-August 15. 

High. This species has been 

documented nesting at several 

locations in the vicinity of the 

project area. 

No. 

 January 2008
Table 3-6 Special Status Species Identified for the Environmental Assessment of Lexam’s 

Planned Oil and Gas Exploration 

3-28

Common 

Name/ 

Scientific 

Name Status1 

Range 

Habitat Requirements 

Potential for Occurrence 

on or Near the Project 

Area 

Eliminated 

from 

Detailed 

Analysis 

Southwestern No. 

willow 

flycatcher 

Empidonax 

traillii extimus 

FE, SE Range: Southwestern U.S. and Mexico. 

In Colorado, this species has been found 

in the southwest corner of the state and 

the San Luis Valley. 

Habitat: Riparian areas with a well 

developed willow component. Breeding 

season is April 15-July 15. 

Low. This species has been 

documented at Rio Grande 

and Higel State Wildlife Areas 

approximately 25 miles 

southwest of the project area. 

Suitable habitat occurs in the 

vicinity of the project area. 

Amphibians 

Boreal toad 

Bufo boreas 

boreas 

SE Range: In Colorado, this species is 

restricted to the Rocky Mountains and is 

found at elevations between 7,000 and 

12,000 feet. 

Habitat: Restricted to areas with suitable 

breeding habitat in spruce-fir forests and 

alpine meadows. Breeding habitat 

includes lakes, marshes, ponds, and 

bogs with sunny exposures and quiet, 

shallow water. Breeding season is April 

15-August 15. 

None. Yes. Lack of 

suitable 

habitat (e.g., 

high elevation 

spruce-fir 

forests, alpine 

meadows) 

occurs within 

the project 

area. 

Northern 

leopard frog 

Rana pipiens 

SC Range: Once the most widespread frog 

species in North America, this species 

has been drastically declining in the last 

50 years. In Colorado, this species is 

found statewide except for the southeast 

and east-central portion of the state. 

Habitat: Typical habitats include wet 

meadows and the banks and shallows of 

marshes, ponds, glacial kettle ponds, 

beaver ponds, lakes, reservoirs, streams, 

and irrigation ditches. Breeding season is 

April 15-August 15. 

High. Suitable habitat exists 

within the project area. 

No. 

 January 2008
Table 3-6 Special Status Species Identified for the Environmental Assessment of Lexam’s 

Planned Oil and Gas Exploration 

3-29

Common 

Name/ 

Scientific 

Name Status1 

Range 

Habitat Requirements 

Potential for Occurrence 

on or Near the Project 

Area 

Eliminated 

from 

Detailed 

Analysis 

Invertebrates 

Uncompahgre 

fritillary 

butterfly 

Boloria 

acrocnema 

FE Range: This butterfly is endemic to the 

high alpine meadows of the San Juan 

Mountains in southwestern Colorado. 

Habitat: This species of butterfly lives in 

patches of snow willow (Salix spp.) at 

high elevations as well as moist tundra 

with dwarf willows above 13,000 feet. 

None. Yes. Project 

area is 

outside of 

species range 

and a lack of 

suitable 

habitat occurs 

within the 

project area. 

Fish 

Bonytail 

Gila elegans 

FE, SE Range: Historically, bonytails were 

present in the Colorado River system, 

which includes the Yampa, Green, 

Colorado and Gunnison rivers. Today, 

there are no known populations in 

Colorado. They can be found in the 

Green River drainage in Utah and 

Mohave Reservoir on the ArizonaNevada border. 

Habitat: This fish typically lives in large, 

fast-flowing waterways of the Colorado 

River system.

None. Yes. The 

project area 

does not 

occur within 

the known 

range of this 

species. 

Razorback 

sucker 

Xyrauchen 

texanus 

FE, SE Range: Originally widespread in the 

Colorado River system, wild populations 

were reduced to a small number of 

individuals in the Yampa, Colorado and 

Gunnison rivers in Colorado. 

Reproducing populations remain only in 

the middle Green River in Utah and in an 

off-channel pond in the Colorado River 

near Grand Junction. 

Habitat: This species is found in deep, 

clear to turbid waters of large rivers and 

some reservoirs over mud, sand or 

gravel. 

None. Yes. The 

project area 

does not 

occur within 

the known 

range of this 

species. 

 January 2008
Table 3-6 Special Status Species Identified for the Environmental Assessment of Lexam’s 

Planned Oil and Gas Exploration 

3-30

Common 

Name/ 

Scientific 

Name Status1 

Range 

Habitat Requirements 

Potential for Occurrence 

on or Near the Project 

Area 

Eliminated 

from 

Detailed 

Analysis 

Humpback 

chub 

Gila cypha 

FE, ST Range: The historic range of the 

humpback is similar to the pikeminnow, 

occurring in great numbers throughout 

the Colorado River system from Green 

River in Wyoming to the Gulf of California 

in Mexico. Today, they can be found in 

deep, canyon-bound portions of the 

Colorado River system such as Black 

Rocks and Westwater canyons on the 

Colorado River and Yampa Canyon 

inside Dinosaur National Monument. 

Habitat: This species prefers deep, fastmoving, turbid waters often associated 

with large boulders and steep cliffs. 

None. Yes. The 

project area 

does not 

occur within 

the known 

range of this 

species. 

Colorado 

pikeminnow 

Ptychocheilus 

lucius 

FE, ST Range: Historically, the pikeminnow 

occurred in great numbers throughout the 

Colorado River system from Green River 

in Wyoming to the Gulf of California in 

Mexico. In Colorado, they are currently 

found in the Green, Yampa, White, 

Colorado, Gunnison, San Juan and 

Dolores rivers. 

Habitat: This species thrives in swift 

flowing muddy rivers with quiet, warm 

backwaters. 

None. Yes. The 

project area 

does not 

occur within 

the known 

range of this 

species. 

Rio Grande 

sucker 

Catostomus 

plebeius 

SE Range: Historically, this species was 

found throughout the Rio Grande river 

system. In Colorado, this species is now 

limited to several small tributaries of the 

Rio Grande River. 

Habitat: This species prefers small 

streams with clear water, pools, and 

riffles. 

High. This species was 

documented near the project 

area in Crestone Creek by 

CDOW in 2005. 

No. 

Rio Grande 

chub 

Gila pandora 

SC Range: In Colorado, this species range is 

restricted to the Rio Grande Basin. 

Habitat: This species prefers pools of 

small to moderate streams near areas of 

current. 

High. This species was 

documented near the project 

area in Crestone Creek by 

CDOW in 2005. It also has 

been documented 1.5 miles 

north of Weisman Lake. 

No. 

 January 2008
Table 3-6 Special Status Species Identified for the Environmental Assessment of Lexam’s 

Planned Oil and Gas Exploration 

3-31

Common 

Name/ 

Scientific 

Name Status1 

Range 

Habitat Requirements 

Potential for Occurrence 

on or Near the Project 

Area 

Eliminated 

from 

Detailed 

Analysis 

No. This 

species 

occurs in 

perennial 

streams, but 

has never 

been 

documented 

in Crestone 

Creek, the 

only perennial 

stream in the 

project area. 

Rio Grande 

cutthroat trout 

Oncorhynchus 

clarki virginalis 

SC Range: In Colorado, this species range is 

confined to the headwaters of the Rio 

Grande surrounding the San Luis Valley. 

Habitat: This species like other cutthroat 

trout species prefers clear, cold streams 

and lakes. 

Moderate. This species is 

known to occur in the 

Saguache Creek drainage 

west of the project area and in 

the San Luis Creek drainage 

northwest of the project area. 

1Status: 

 FE-Federally Endangered 

 FT-Federally Threatened 

 FC-Federal Candidate 

 SE-State Endangered 

 ST-State Threatened 

 SC-State Species of Concern 

Source: Butterfly Conservation Initiative 2007; Black-footed Ferret Recovery Program 2007; CDOW 2007a,b,c,e,f,g; CDOW 2003, 2002; 

CNHP 2007, 2006; Ellison et al. 2003; Fitzgerald et al. 1994; Garcia 2007; Gray 1998; Gunnison’s Sage-grouse Rangewide 

Steering Committee 2005; Johnsgard 1990; Kingery 1998; USFWS Mountain-Prairie Region 2007; USFWS and Lexam 

Explorations 2007; USFWS 2007a,b,c; USFWS 2005; Woodling 1985). 

 January 2008
Northern Pocket Gopher (SC). The northern pocket gopher (Thomomys talpoides agrestis) occurs in the San 

Luis Valley north and east of the Rio Grande River (Fitzgerald et al. 1994). This species inhabits a wide variety 

of habitats including desert shrublands, grasslands, forests, and alpine tundra. This species was documented 

in 2005 by CNHP on the Baca Grande 1 mile east of the project area (CNHP 2006). The potential for this 

species to occur within the project area is considered high. 

Black-footed Ferret (FE, SE). The black-footed ferret (Mustela nigripes) is known only from a reintroduced 

population in northwestern Colorado (CDOW 2007a). Black-footed ferrets are considered obligate associates 

to prairie dogs, which constitute their primary food source and provide burrows for shelter (Black-footed Ferret 

Recovery Program 2007; CDOW 2007a; Fitzgerald et al. 1994). Although the Refuge occurs within the historic 

range of the black-footed ferret, this species is presently restricted to reintroduced populations in Arizona, 

northwestern Colorado, Montana, South Dakota, north-central Utah, and Wyoming; however, remnant ferret 

populations may exist in portions of its former range (Black-footed Ferret Recovery Program 2007). Potentially 

suitable habitat within Gunnison’s prairie dog colonies occurs within the project area. No designated critical 

habitat has been established for the ferret. Based on the current distribution of this species, the potential for 

this species to occur within the project area is considered low. 

3.6.2.2 Birds 

Bald Eagle (ST). The bald eagle (Haliaeetus leucocephalus) is primarily a winter migrant throughout Colorado, 

although bald eagle nests have been documented throughout Colorado, primarily along river, lakes and 

reservoirs. Primary wintering areas for this species in Colorado include the South Platte, Arkansas, White, 

Colorado, and Yampa rivers (Gray 1998). Bald eagles typically select very large, open canopy trees such as 

cottonwood and ponderosa pine for nesting (Johnsgard 1990; Kingery 1998). Within the project area, bald 

eagles primarily feed on waterfowl and carrion. Most of the bald eagle use near the project area occurs along 

Crestone Creek (USFWS and Lexam Explorations 2007). CDOW considers the entire project area winter 

range and a small area northeast of the project area along Crestone Creek as roosting habitat. No known nest 

sites occur within the vicinity of the project area (CDOW 2007g). The potential for this species to occur within 

the project area is considered moderate. 

Ferruginous Hawk (SC). Ferruginous hawks (Buteo regalis) are found throughout the Great Plains and shrubsteppe areas of western North America (Johnsgard 1990; Kingery 1998). In Colorado, this species is typically 

found in arid to semiarid regions, as well as grasslands and agricultural areas. Most breeding records occur on 

the eastern plains, northwest Colorado, and San Luis Valley (Kingery 1998). This species forages over open 

country and typically nests on cliff faces, rock outcrops, and grassy knolls but may also nest in pinyon-juniper 

woodlands (Johnsgard 1990; Kingery 1998). In Colorado, nesting can begin as early as mid-March and last 

through July (Kingery 1998). This species has been documented nesting in the vicinity of the project area 

(Garcia 2007; USFWS and Lexam Explorations 2007). The potential for this species to occur within the project 

area is considered high. 

American Peregrine Falcon (SC). The peregrine falcon (Falco peregrinus) is found throughout western 

Colorado in areas of suitable habitat. This species prefers areas with suitable nesting habitat (i.e., ledges on 

tall cliffs) with pinyon-juniper or ponderosa pine woodlands nearby (Johnsgard 1990; Kingery 1998). In 

Colorado, peregrine falcons arrive at their nesting areas in March and typically begin nesting by April (Kingery 

1998). This species hunts for shorebirds and other small water birds in the wetlands and short-emergent 

vegetation wetlands within the project area during spring and fall migration (USFWS and Lexam Explorations 

2007). There are no known nesting areas in the immediate vicinity of the project area (CDOW 2007g). Suitable 

foraging habitat occurs within the project area. The potential of this species to occur within the project area is 

considered moderate. 

Greater Sandhill Crane (SC). In Colorado, the greater sandhill crane (Grus canadensis) breeds in northwest 

Colorado and migrates through the San Luis Valley in the spring and fall in route to wintering grounds in New 

Mexico (Kingery 1998). This species inhabits a wide variety of habitats including wetlands, flooded fields, 

beaver ponds, marshes, wet meadows. Greater sandhill cranes arrive in the San Luis Valley in late February 

3-32 January 2008
and begin courtship in March (Kingery 1998). This species has been documented using flooded meadows and 

wetlands within the project area (USFWS 2005). The potential for this species to occur within the project area 

is considered high. 

Western Snowy Plover (SC). The western snowy plover (Charadrius alexandrinus) is considered a rare 

migrant and rare breeder in Colorado. This species utilizes broad, alkali beaches of manmade reservoirs and 

typically nests within a shallow depression (Kingery 1998). This species has successfully adapted to nesting 

on the shores of irrigation storage reservoirs. Western snowy plovers arrive in Colorado in early April and 

typically nests in late April and May. Nests have been documented at several southeastern Colorado 

reservoirs along the Arkansas River and in the San Luis Valley (Kingery 1998). This species has been 

documented nesting at San Luis Lake approximately 15 miles south of the project area (Kingery 1998). The 

potential for this species to occur within the project area is considered low as habitat for this species is not 

present in project area. 

Mountain Plover (SC). In Colorado, mountain plovers (Charadrius montanus) are found on the eastern plains 

and intermountain parks and valleys including North Park, South Park, and the San Luis Valley (Kingery 1998) 

Breeding habitat for the mountain plover in the San Luis Valley is characterized as semi-desert shrublands 

(Kingery 1998). In the San Luis Valley, mountain plovers use flat, sparsely vegetated areas with stunted 

shrubs and widely spaced dwarf rabbitbrush (Kingery 1998). This species generally arrive on their breeding 

grounds from mid-March through mid April. Nests are typically built in a slight depression on bare or open 

ground (Kingery 1998). Eggs are typically laid in May, averaging three per clutch. Mountain plovers typically 

migrate from their breeding grounds in early August to late September to wintering grounds located from 

Texas to southern California (Kingery 1998). This species was documented in 2005 by CNHP on the Baca 

Grande east of the project area (CNHP 2006). The potential for this species to occur within the project area is 

considered high. 

Long-billed Curlew (SC). The long-billed curlew (Numenius americanus) is found mainly in southeastern 

Colorado with additional small populations found in northeastern and northwestern Colorado (Kingery 1998). 

This species prefers open, sparsely vegetated habitats such as short-grass prairie with scattered wetlands and 

playas. Adults typically arrive on breeding grounds in April and lay eggs by May. Very few breeding records 

exist for the San Luis Valley, although suitable nesting habitat occurs within the project area (USFWS 2005). 

This species has been documented migrating through the project area (Garcia 2007). The potential for this 

species to occur within the project area is considered to be high in the project area. 

Western Yellow-billed Cuckoo (FC, SC). The western yellow-billed cuckoo (Coccyzus americanus) is limited to 

west of the Continental Divide in Colorado although small scattered populations occur in the San Luis Valley 

(USFWS 2005). Typical habitat of the western yellow-billed cuckoo consists of old growth riparian woodlands 

with dense understories (Kingery 1998). Nests are typically located high in trees with closed canopies. Nesting 

peaks later (mid-June through August) than in most co-occurring bird species, and may be triggered by an 

abundance of the cicadas, katydids, caterpillars, or other large prey that form the bulk of their diet. The species 

is inconspicuous on its breeding range, except when calling to attract or to contact mates (Kingery 1998).This 

species has been documented in the San Luis Valley in dense, old-growth cottonwoods on McIntire Springs 

approximately 35 miles south of the project area (USFWS 2005). Suitable habitat occurs in the vicinity of the 

project area for this species along riparian areas (USFWS 2005). The potential for this species to occur within 

the project area is considered low. 

Burrowing Owl (SC). The burrowing owl (Athene cunicularia) is typically associated with prairie dog colonies 

and heavily grazed tracts of mixed-grass prairie. In Colorado, this species is found on the eastern plains, 

intermountain parks and valleys, and western portions of the state including areas around Cortez and Grand 

Junction (Kingery 1998). Habitat typically consists of desert-shrublands and grasslands with sparse vegetation 

and abundant burrows (Kingery 1998). This species arrives in Colorado in late March or early April and begins 

nesting by late April (Kingery 1998). The breeding season is typically March 15-August 15. Burrowing owls 

nest in rodent burrows in areas with sparse vegetation and several nesting records have been recorded in the 

3-33 January 2008
San Luis Valley (Kingery 1998). This species has been documented nesting in the vicinity of the project area 

(Garcia 2007; USFWS and Lexam Explorations 2007). The potential for this species to occur within the project 

area is considered high. 

Southwestern Willow Flycatcher (FE, SE). The USFWS (1995) listed the southwestern willow flycatcher 

(Empidonax trailli extimus) as an endangered species on February 27, 1995. The breeding range of the 

southwestern willow flycatcher includes southern California, Arizona, New Mexico, extreme southern portions 

of Nevada and Utah, far western Texas, southwestern Colorado, and extreme northwestern Mexico (USFWS 

2007b). The southwestern willow flycatcher historically nested primarily in willows, buttonbush, and coyote 

brush, with a scattered overstory of cottonwood (USFWS 2007b). This species nests in dense riparian habitats 

from sea level to approximately 8,500 feet in Arizona and southwestern Colorado. This species still nests in 

native vegetation where available, but has been known to nest in thickets dominated by Tamarisk spp. 

(USFWS 2007b). The southwestern willow flycatcher typically builds a nest near surface water or the damp 

soil of intermittent streams that support the riparian vegetation. Nests are cup-shaped made constructed of 

plant material usually 3 to 15 feet aboveground in a fork or on a horizontal branch of a medium-sized bush or 

small tree with dense vegetation above and around the nest (USFWS 2007b). The southwestern willow 

flycatcher arrives on breeding grounds in late April and May, nesting typically begins in May and June and 

young usually fledge from late June into mid-August (USFWS 2007b). Surveys to document the presence of 

southwestern willow flycatcher within the project area have not been conducted to date. Suitable habitat 

occurs in the vicinity of the project area for this species along riparian areas (USFWS 2005). This species has 

been documented by CDOW at Rio Grande and Higel State Wildlife Areas approximately 25 miles southwest 

of the project area and Alamosa NWR approximately 30 miles south of the project area (CDOW 2003, 2002). 

The potential for this species to occur within the project area is considered low. 

3.6.2.3 Amphibians 

Northern Leopard Frog (SC). The northern leopard frog (Rana pipiens) was once considered the most 

widespread frog species in North America. In Colorado, this species is found throughout the state except for 

the southeast and east-central portions of the state (CDOW 2007b). This species prefers wet meadows and 

the banks and shallows of marshes, ponds, glacial kettle ponds, lakes, reservoirs, streams, and irrigation 

ditches (CDOW 2007b). The breeding season for this species is April 15-August 15. The potential for this 

species to occur within the project area is considered high. 

3.6.2.4 Fish 

Rio Grande Sucker (SE). The Rio Grande sucker (Catostomus plebeius) occurs exclusively in the Rio Grande 

basin from Colorado to Mexico (CDOW 2007c; Woodling 1985). In Colorado, this species is limited to small 

creeks and springs within the San Luis Valley such as Hot Creek and McIntyre Springs (CDOW 2007c; 

Woodling 1985). This species prefers backwaters and pools near rapidly flowing water (Woodling 1985). The 

Rio Grande sucker typically spawns from February to April and may spawn a second time in late summer 

(Woodling 1985). This species was documented near the project area in 2005 by CDOW in Crestone Creek 

and laterals in the project area (CNHP 2006). The potential for this species to occur within the project area is 

considered high. 

Rio Grande Chub (SC). The Rio Grande chub (Gila pandora) occurs in a single area in Texas, and north 

through the Rio Grande and Pecos River drainages of New Mexico into southern Colorado (Woodling 1985). 

In Colorado, this species is found exclusively in the Rio Grande basin in pools of small streams and creeks. 

The Rio Grande chub prefers streams with undercut banks, overhanging bank vegetation, and aquatic 

vegetation (CDOW 2007c; Woodling 1985). The spawning period for this species is largely unknown although 

it most likely mimics that of the Rio Grande sucker. This species was documented near the project area in 

2005 by CDOW in a ditch associated with Crestone Creek and at a spring 1.5 miles north of Weisman Lake 

(CNHP 2007, 2006). The potential for this species to occur within the project area is considered high. 

3-34 January 2008
Rio Grande Cutthroat Trout (SC). The Rio Grande cutthroat trout (Oncorhynchus clarki virginalis) occurs in the 

headwaters of the Rio Grande River surrounding the San Luis Valley. This species prefers clear, cold streams 

and lakes, and shallow riffles and runs for spawning (CDOW 2007c). The spawning period for this species is 

roughly March-July depending on water temperature (CDOW 2007c). The Rio Grande cutthroat trout is known 

to occur in the Saguache Creek drainage west of the project area and in the San Luis Creek drainage 

northwest of the project area (CDOW 2007c). The potential for this species to occur within the project area is 

considered moderate. 

3.7 Cultural Resources 

3.7.1 Regulatory Framework 

Cultural resources on all federal lands are regulated by a series of federal laws enacted to protect these 

resources from damage or loss due to federally funded activities or private undertakings on federally managed 

lands. The public’s recognition that these non-renewable resources are important and should be protected 

began very early in the 20th century and continues to the present. Three of the most important laws are the 

National Historic Preservation Act (NHPA) of 1966, as amended; the American Indian Religious Freedom Act 

(AIRFA) of 1978; and the Archaeological Resource Protection Act (ARPA) of 1979. EO 11593 also provides 

necessary guidance on protection and enhancement of cultural resources. New legislation and emphases that 

have come to the forefront over the past 20 years include the Native American Graves Protection and 

Repatriation Act (NAGPRA) of 1990, EO 13007, the consideration of historic and traditional landscapes, and 

the increased awareness of and consultation for traditional cultural properties. 

Section 106 of the NHPA requires federal agencies to assess the effects of an undertaking on historical and 

archaeological sites. The proposed action is not considered an undertaking as defined by NHPA, and 

therefore is not subject to review. Nevertheless, the USFWS is conducting a review of effects on historical and 

archaeological sites in order to ensure that the proposed measures protect cultural resources to the maximum 

extent practicable. This was accomplished by inventorying planned disturbance areas or area of potential 

effect (APE), evaluating site importance and eligibility to the National Register of Historic Places (NRHP), 

assessing the effect of the proposed action on NRHP-eligible sites, and consulting with appropriate historic 

preservation agencies. The APE for the Lexam project includes the planned well pads, plus a 100-foot buffer, 

and the planned access roads, plus a 50-foot buffer on either side of each road. . 

3.7.2 Cultural Resources Investigations 

In the fall of 2006, TRC Mariah Associates Inc. (TRC Mariah) conducted cultural resource investigations on 

portions of the Refuge on behalf of the USFWS, Region 6, and Lexam (TRC Mariah 2006). These 

investigations included Class I and Class III inventories. Class I inventories are a review of reports containing 

the results of previously conducted surveys in the planned project area, as well as library and archival sources 

for regional prehistory and history. Class III inventories are intensive field surveys of areas in which potential 

impacts are anticipated or are likely to occur. 

On September 20, 2006, TRC Mariah conducted a Class I file search using the Compass on-line cultural 

resources database of the Colorado Historical Society. The file search indicated that no cultural resource 

inventories were previously conducted, and no sites have been previously documented within the APE. 

From September 29 through October 1, 2006, TRC Mariah conducted a Class III cultural resource inventory of 

the planned Baca #5 and Baca #6 well pads and access roads within the Refuge. The survey boundary 

consisted of a 10-acre block centered on the planned well pad location and a 100-foot-wide corridor centered 

on the access road centerline. A total of 37.6 acres was inventoried on federal land administered by the 

USFWS. 

3-35 January 2008
As a result of the Class III inventory, a total of two sites (5SH3146 and 5SH3147.1) and four isolates 

(5SH3148, 5SH3149, 5SH3150, and 5SH3151) were recorded. The sites included a prehistoric lithic scatter 

and historic canal. All of the isolates are prehistoric. 

Site 5SH3146 consists of a sparse disperse lithic scatter that included one basalt and four obsidian flakes. No 

features, diagnostic artifacts, or other unique artifacts were located during the inventory. Intensive inspection 

of the sand sheet in and around the site boundary did not reveal any evidence of buried cultural deposits or 

soils. Two shovel tests were dug within the site boundary to a depth of approximately 20 inches. Neither 

shovel test encountered any buried cultural deposits or soils. As a result of the inventory and shovel testing, 

the site was recommended by the USFWS as not eligible for the NRHP, and in a letter dated December 7, 

2006, the Colorado State Historic Preservation Office (SHPO) concurred with the eligibility determination 

(Contiguglia 2006). 

Site 5SH3147.1 is a canal that measures approximately 3 to 4 feet wide and 1 foot deep and will be crossed 

by a planned access road. The canal is a named, adjudicated canal listed in the 1901 Decree Book, Water 

District No. 25, Saguache County, Colorado, and is part of the irrigation system associated with the 

post-Spanish period settlement and homesteading of the San Luis Valley. The canal was recommended by 

the USFWS as eligible for the NRHP, and the SHPO concurred with the eligibility determination (Contiguglia 

2006). 

Four isolates were located during the Class III inventory. Isolate 5SH3148 consists of a single piece of 

limestone heat-altered rock. Isolate 5SH3149 consists of a basalt projectile point base. The remaining two 

isolates, 5SH3150 and 5SH3151, consist of a white chert projectile point and a brown chert modified flake, 

respectively. All four of the isolates are not eligible for the NRHP (Contigugia 2006). 

Subsequent to the Class III inventory conducted for the planned Baca #5 and Baca #6 well pads and access 

roads, TRC Mariah conducted a Class III inventory for Lexam’s Baca 3D Seismic Project, which encompasses 

the currently planned well pads and access roads (TRC Mariah 2007). A total of 325.9 miles (2,607 acres) of 

planned seismic lines, access roads, and fence lines were inventoried within the Refuge. The inventory was 

conducted from mid-October to mid-November 2006. 

A total of 61 sites and 96 isolated finds were recorded during the Baca 3D Seismic Project Class III inventory. 

A total of 39 of the sites are prehistoric open camps, 5 are historic sites (cow camp, bridge, and artifact 

scatters), 3 sites are multi-component sites containing both prehistoric and historic components, and 14 are 

segments of historic canal systems. The isolated finds primarily are prehistoric lithic, groundstone, or 

heat-ltered rock remains, and a few are historic trash. 

All of the canals segments were recommended by the USFWS as eligible for the NRHP. A total of 37 of the 

remaining 47 sites were unevaluated prehistoric sites and 1 was an unevaluated historic site. Additional data 

were recommended for these 38 sites in order to determine their NRHP eligibility. A total of 9 sites and the 

96 isolated finds were recommended as not eligible for the NRHP. In a letter dated January 29, 2007, the 

Colorado SHPO concurred with the NRHP eligibility determination for the 9 sites and 96 isolated finds and that 

additional data were necessary to determine the eligibility of the 38 sites (Contiguglia 2007). 

The 38 sites that were either eligible for the NRHP or needed additional data were avoided during seismic 

activities by rerouting those activities around the sites. To avoid impact to the NRHP-eligible canals by seismic 

vehicles, the vehicles were driven over the canals when the ground was frozen. This protection measure was 

reviewed by the USFWS and submitted to the SHPO for review and concurrence prior to initiation of seismic 

activities. In a letter dated January 29, 2007, the Colorado SHPO concurred that no adverse effects will occur 

to the canals since vehicular traffic would take place when the ground was frozen (Contiguglia 2007). 

3-36 January 2008
3.8 Native American Traditional Values 

Federal law and agency guidance require federal agencies to consult with Native American tribes concerning 

the identification of cultural values, religious beliefs, and traditional practices of Native American people that 

may be affected by actions on federal lands. This consultation includes the identification of places 

(i.e., physical locations) of traditional cultural importance to Native American tribes. Places that may be of 

traditional cultural importance to Native American people include, but are not limited to, locations associated 

with the traditional beliefs concerning tribal origins, cultural history, or the nature of the world; locations where 

religious practitioners go, either in the past or the present, to perform ceremonial activities based on traditional 

cultural rules or practice; ancestral habitation sites; trails; burial sites; and places from which plants, animals, 

minerals, and waters possessing healing powers or used for other subsistence purposes, may be taken. 

Additionally, some of these locations may be considered sacred to particular Native American individuals or 

tribes. 

In 1992, the NHPA was amended to explicitly allow that “properties of traditional religious and cultural 

importance to an Indian tribe or Native Hawaiian organization may be determined to be eligible for inclusion on 

the NRHP.” If a resource has been identified as having importance in traditional cultural practices and the 

continuing cultural identity of a community, it may be considered a traditional cultural property (TCP). The term 

“traditional cultural property” first came into use within the federal legal framework for historic preservation and 

cultural resource management in an attempt to categorize historic properties containing traditional cultural 

significance. National Register Bulletin 38: Guidelines for Evaluating and Documenting Traditional Cultural 

Properties (Parker and King 1989) defines a TCP as “one that is eligible for inclusion in the NRHP because of 

its association with cultural practices or beliefs of a living community that (a) are rooted in that community’s 

history, and (b) are important in maintaining the continuing cultural identity of the community.” To qualify for 

nomination to the NRHP, a TCP must be more than 50 years old, must be a place with definable boundaries, 

must retain integrity, and must meet certain criteria as outlined for cultural resources in the NHPA. 

In addition to the NRHP eligibility, some places of cultural and religious importance also must be evaluated to 

determine if they should be considered under other federal laws, regulations, directives, or policies which 

include, but are not limited to, EO 13007 of 1996, the AIRFA of 1978, and the NAGPRA of 1990. 

Although not required to comply with NHPA in order to ensure that cultural resources are protected to the 

maximum extent practicable, the USFWS initiated government-to-government consultation for Lexam’s 

planned project by sending letters on September 20, 2007, to the following Native American tribal groups: 

Southern Ute, Ute Mountain Ute, Jicarilla Apache, Hopi, Uintah & Ouray/Northern Ute, Navajo Nation, Pueblo 

of Santa Ana, Pueblo of Santo Domingo, San Ildefonso Pueblo, Pueblo of Nambe, San Juan Pueblo, Santa 

Clara Pueblo, Pueblo of Jemez, Pueblo of Picuris, Pueblo of Taos, and Pueblo of Zuni. The letters were sent 

to inform the various tribal groups of the proposed action and to solicit any comments the tribes may have 

concerning TCPs or places of cultural and religious importance to the tribes in the project area. Table 3-7 lists 

the Native American groups that have been contacted and summarizes the current status of consultation and 

the concerns they have identified regarding the proposed action. 

Table 3-7 Summary of Native American Consultation 

Name of Tribe 

Date of 

Letter 

Follow-up 

Calls Status 

Southern Ute Indian 

Tribe 

9/20/07 10/9/07 

10/17/07 

No response to date. 

Ute Mountain Ute Tribe 9/20/07 10/9/07 

10/11/07 

Tribe requested a second copy of the 9/20/07 

letter. 

3-37 January 2008
Table 3-7 Summary of Native American Consultation 

3-38

Name of Tribe 

Date of 

Letter 

Follow-up 

Calls Status 

Jicarilla Apache Tribe 9/20/07 10/10/07 

10/17/07 

No response to date. 

The Hopi Tribe 9/20/07 10/18/07 Tribe requested and was provided copies of the 

survey reports. Also requested an EIS be 

prepared for the project, additional consultation 

if NRHP-eligible prehistoric sites would be 

adversely affected, and copies of any mitigation 

plans, if needed. 

Uintah & Ouray/Northern 

Ute Tribe 

9/20/07 10/10/07 

10/16/07 

Tribe requested a second copy of the 9/20/07 

letter. 

Navajo Nation 9/20/07 10/10/07 

10/11/07 

Tribe stated that no Navajo TCPs or historic 

properties would be impacted by the project, 

but requested to be contacted in the event of 

unanticipated discoveries. 

Pueblo of Santa Ana 9/20/07 10/11/07 Tribe has no comment at this time. 

Pueblo of Santo Domingo 9/20/07 10/11/07 

10/17/07 

No response to date. 

San Ildefonso Pueblo 9/20/07 10/11/07 

10/17/07 

Tribe has no concerns, but requested an 

update on the project. 

Pueblo of Nambe 9/20/07 10/11/07 

10/17/07 

No response to date. 

San Juan Pueblo 9/20/07 10/11/07 

10/17/07 

No response to date. 

Santa Clara Pueblo 9/20/07 10/11/07 Tribe requested copies of the survey reports. 

Pueblo of Jemez 9/20/07 10/11/07 

10/17/07 

Tribe has no concerns at this time, but stated 

that other Pueblos may be interested in the 

project. 

Pueblo of Picuris 9/20/07 10/11/07 

10/17/07 

No response to date. 

Pueblo of Taos 9/20/07 10/11/07 

10/17/07 

No response to date. 

Pueblo of Zuni 9/20/07 10/11/07 

10/17/07 

Tribe requested and was provided copies of the 

survey reports. 

Source: Van Ness 2007. 

3.9 Recreation 

The Refuge is presently closed to the public, and as such, there are no recreational opportunities at the 

Refuge or in the project area. 

 January 2008
3.10 Socioeconomic Resources 

Because the Refuge is federal land currently closed to the public, there are no direct economic or social 

considerations associated with the project area. Therefore, the influence area for economic and social 

considerations associated with the planned Lexam Project is viewed within a regional context and includes a 

portion of southern Saguache County in south-central Colorado and the City of Alamosa in Alamosa County. 

Alamosa was included in the region of influence as it is the most likely location for the drill rig crews and other 

project personnel to be stationed during the project. The region is predominately rural with several small 

communities (i.e., Crestone, Moffat, Hooper, and Center) nearby. 

3.10.1 Population 

Saguache County had a population of 5,917 residents in 2000. The U.S. Census Bureau estimated an 

18.4 percent increase in population between April 1, 2000 and July 1, 2006 for a total estimated population of 

7,006 residents in 2006 (U.S. Census Bureau 2007). The majority of Saguache County residents (3,676 est.) 

lived in unincorporated areas, including the Baca Grande subdivision. Center and Saguache are the county’s 

two largest communities, with 2,500 and 620 residents, respectively, in 2004. Other communities in the region 

include Bonanza City, Crestone, and Moffat (U.S. Census Bureau 2005). 

Population growth in Saguache County has occurred primarily from lifestyle migration into the Baca Grande 

and Crestone communities, and the settlement in Center of agricultural households employed across the San 

Luis Valley. 

The City of Alamosa has a current estimated population of 8,679, up from 7,960 recorded in the 2000 census. 

3.10.2 Economic Overview 

Total full- and part-time employment in Saguache County increased to 2,750 jobs in 2003 from 2,131 jobs in 

1990, a gain of 619 jobs or 29 percent. Employers in Saguache County include the federal government 

(National Park Service [NPS], USFWS, USFS, U.S. Postal Service, NRCS [agriculture], and others), farmers 

and ranchers, recreational and tourism outlets and sites, and the service industry. 

In 2002, agricultural operations in Saguache County involved approximately 24 percent of the county’s total 

acreage, and sales of local crops and livestock generated more than $176 million in the two-county region. 

Potatoes, barley and wheat grains, and forage for livestock feed were the predominant crops in terms of acres 

harvested. 

Recreation and tourism also have a substantial role in the regional economy, and attractions in the San Luis 

Valley include: the Great Sand Dunes National Park; portions of the Rio Grande National Forest; the 

Cumbres and Toltec Scenic Railway (a steam-powered excursion railroad); Monte Vista, and Alamosa 

refuges; San Luis Lakes State Park and multiple state wildlife management areas; Los Caminos Antiguos 

Scenic Byway; Fort Garland Historic Fort and Museum; multiple spiritual, new age, and retreat centers in 

Crestone and the Baca Grande subdivision; Shrine of the Stations of the Cross in San Luis; numerous local 

museums and historical sites; and the annual sandhill crane migration and festival. Visitors and travelers 

support numerous jobs in the region’s retail trade, accommodations and dining, and entertainment and other 

affiliated industries. 

The City of Alamosa bills itself as the lodging hub of the San Luis Valley and offers many lodging and dining 

establishments that cater to the tourists who visit San Luis Valley attractions. 

3.10.3 Income, Poverty, and Unemployment 

Total personal income in Saguache County was $120.4 million in 2003. Despite recent gains, per capita 

income in the area lags behind other areas in Colorado. Per capita income of $18,063 in Saguache (2003), 

3-39 January 2008
ranked the county 62nd in the state. Over time, local unemployment rates have been persistently above the 

statewide averages. The seasonality of many jobs in agriculture, tourism, and trade, contribute to that pattern, 

as well as to the lower than average per capita incomes. There are no disadvantaged populations in the 

influence area. 

3.10.4 Demographic Characteristics 

In 2000, 37 percent of the population of Saguache County was over 45 years of age. More than 31 percent of 

Saguache County residents had moved there since 1995. The county has a relatively large minority 

population. More than one of four residents in Saguache County are nonwhite (primarily Hispanic or Latino), 

compared to about one of six statewide. Apaches, Navajos, and Utes were the most commonly reported 

Native American tribal affiliations. No established American Indian reservations are located in Saguache 

County. 

3.10.5 Housing 

At the time of the 2000 census, more than 25 percent of all units were reported vacant in Saguache County. 

However, 46 percent of the vacant units (361 units) were reported as being for seasonal, recreational, or 

occasional use. The latter includes about 75 units located in Crestone, the Baca Grande subdivision, and 

nearby areas. Recent population growth and migration are reflected in levels of new residential construction. 

An estimated 454 new homes were reported in Saguache County (nearly a 15 percent increase in 5 years). 

Many of these units are located in the Baca Grande subdivision, a planned community consisting of 

15,000 acres divided into approximately 4,200 lots. The community includes parks, a recreational vehicle 

park, tennis courts, ballfields, and greenbelts. Baca Grande is accessed via County Road T. 

3.10.6 Traffic 

The primary highway access through the region to the project area is via State Highway (SH) 17, a key 

north-south regional highway in the San Luis Valley, to Saguache County Road (CR) T to Lexam Road on the 

Refuge. 

Saguache CR T is a paved road that extends east from SH 17 and terminates at two destinations — Crestone 

and the Baca Grande subdivision; therefore, traffic on CR T is related primarily to these destinations. The 

Crestone destination includes the Town of Crestone (population 73 in 2000) and three USFS trailheads. The 

Baca Grande destination includes a small Colorado College satellite facility, a restaurant and several other 

small businesses, over 600 residences, and more than a dozen spiritual retreat centers. 

The City of Alamosa is reached by Highways 285 and 160 and by SH 17. Commuters from Alamosa to the 

project site would take SH 17 to CR T, a commute of over 50 miles each way. 

3.10.7 Emergency Services 

In Saguache County, the County Sheriff responds to accidents and incidents on CRs. Troop 5B of the 

Colorado State Patrol, headquartered in Alamosa, handles incidents on SHs 150 and 17. 

The San Luis Valley Regional Emergency Medical Services/Trauma Advisory Council (SLV RETAC) 

encompasses six counties located in the south-central portion of Colorado; these counties include Alamosa, 

Conejos, Costilla, Rio Grande, Mineral, and Saguache. There are 10 Emergency Medical Service transport 

services in the San Luis Valley. The SLV RETAC includes a fully trained Hazmat team that has dealt with 

incidents that have involved explosives, fuel spills, unknown white powders, methamphetamine labs, school 

chemicals, and numerous other incidents. 

Emergency medical service for Saguache County and Alamosa, including ambulance transport, is dispatched 

from the San Luis Valley Regional Medical Center. The San Luis Valley Regional Medical Center is the major 

3-40 January 2008
trauma center in the San Luis Valley and includes a Level III trauma center, a six-bed intensive care unit, 

24-hour lab and imaging services, and an in- and out-patient surgery unit. Other area hospitals include the 

Conejos County Hospital in La Jara and the Rio Grande Hospital in Del Norte, both Level IV trauma centers. 

The Crestone and Baca Grande Volunteer Fire Departments (6 and 30 volunteers, respectively) provide 

primary structural fire protection for their communities. The Kundalini Fire Management (a 20-member 

department) also serves the Baca Grande subdivision and surrounding area. 

In 2007, the town of Crestone applied for and received $638,210 in Energy and Mineral Impact Assistance 

program money from the Colorado Department of Local Affairs (DOLA), specifically mentioning Lexam’s 

planned exploration in the application. The money (of which $500,000 is an outright grant and the remaining 

$138,210 is a loan) is intended to provide for a water system to deliver potable drinking water and for fire 

fighting. The program, founded by the state legislature in 1977, was designed provide assistance to local 

communities that are impacted by boom and bust cycles in the energy and mineral extraction industries 

(DOLA 2007). A water system in nearby Crestone would increase the preparedness to deal with fire 

emergencies. 

3.10.8 Land Use and Ownership 

The land use and ownership in the project area is a NWR, administered by the USFWS. Regional land uses 

include agriculture, forested areas, and areas supporting wildlife, rural residential, residential, commercial, and 

industrial land uses. The Baca Grande subdivision and Crestone are included in the rural residential 

development category. The majority of Saguache County has been zoned as agricultural, with residential uses 

allowed “by right.” Other uses on private lands in unincorporated areas require approvals from the respective 

zoning administrators and commissions. Federal lands account for approximately 69 percent of the lands in 

Saguache County. Another 4 percent of the land in the county is managed by the state, and 27 percent is 

privately owned. The latter includes a small amount of land managed by local public entities such as 

municipalities or school districts. 

3.10.9 Environmental Justice 

On February 11, 1994, President Clinton issued EO 12898, “Federal Actions to Address Environmental Justice 

in Minority Populations and Low-Income Populations.” This EO is designed to focus the attention of federal 

agencies on the human health and environmental conditions in minority communities and low-income 

communities. It requires federal agencies to adopt strategies to address environmental justice concerns within 

the context of agency operations. In an accompanying Presidential memorandum, the President emphasized 

existing laws, including the National Environmental Policy Act (NEPA), should provide opportunities for federal 

agencies to address environmental hazards in minority and low-income communities. 

The Crestone/Baca Grande subdivision area does not comprise a minority or low-income community. 

3.11 Aesthetics 

3.11.1 Visual Resources 

3.11.1.1 Regional Physical Setting 

The planned Lexam Project is situated in the Refuge, in Saguache County, in the northern San Luis Valley, 

approximately 15 miles northwest of Great Sand Dunes National Park, approximately 19 miles east of U.S. 

Highway 285, approximately 6 miles southwest of Crestone, approximately 8 miles southeast of Moffat, and 

approximately 32 miles north of Alamosa, Colorado. The San Luis Valley is located within the Southern Rocky 

Mountain Physiographic Province, which is characterized by long, north-south-trending mountain ranges 

separated by broad valleys. 

3-41 January 2008
3.11.1.2 Project Area Physical Setting 

The planned project area is located along Spanish and Willow Creeks approximately 1 to 3 miles west of 

Camino del Rey on the Baca Grande subdivision. The site contains scenic resources comparable to other 

areas of the region with similar habitats and features, and its overall level of scenic quality is considered 

moderate to high. 

The planned project is situated at an elevation of approximately 7,600 feet above mean sea level. The 

immediate area is dominated by a single large cottonwood tree (Populus deltoides), and a variety of vegetation 

communities including desert shrublands, grasslands, wet meadows, and playa wetlands. Please see 

Section 3.5, Vegetation and Habitats, for detailed descriptions of communities. 

The project area has distant views to and from trails and recreation areas of the San Isabel National Forest in 

the Sangre de Cristo mountain range (approximately 8.0 miles to the east), Kit Carson peak (approximately 

10.5 miles to the east), and trails and recreation areas of the Rio Grande National Forest (approximately 

30.0 miles to the west). 

The greatest potential for public views of the planned project is from the gate at Lexam Road and CR T which 

is to the north of the planned project and from Camino del Rey Road on the Baca Grande subdivision to the 

east. Other viewing opportunities are from residences, religious sites, recreation areas, and roads in the San 

Luis Valley and higher elevations to the east, north, and west of the well sites and at substantial distances (3 to 

30 miles away). 

The nearest residences with views to the project site are located approximately 3 miles to the east, along 

Camino del Rey Road. Residences in the Baca Grande subdivision along the base of the Sangre de Cristo 

Mountains would have views at a distance of 4.5 or more miles. 

3.11.2 Noise 

3.11.2.1 Ambient Soundscape Setting 

At any location, both the magnitude and frequency of environmental noise may vary considerably over the 

course of the day. Variation is caused both by changes in the noise source, and by changes in weather 

conditions. The magnitude of a change in sound level is measured in decibels. A three-decibel change is a 

100 percent increase or decrease in the sound level, and a ten-decibel change is a 1,000 percent increase or 

decrease in the sound level. Sound levels in decibels are measured in dBA, which means sound levels on the 

“A” scale of a standard sound level meter. 

Two measures of the time-varying quality of environmental noise are the 24-hour equivalent sound level 

(Leq(24)), and the sound level day/night (Ldn) (USEPA 1974). The Leq(24) is the level of steady sound with the 

equivalent energy as the time-varying sound of concern, averaged over a 24-hour period. The Ldn accounts for 

people’s greater sensitivity to nighttime noise by adding 10 decibels of the dBA to the Leq(24). The Ldn is applied 

between the hours of 10 p.m. and 7 a.m. 

The planned project will occur in a rural agricultural area. Noise sources in rural areas are predominantly 

natural and include insects, birds, wind, weather, and livestock. Other noises associated with rural areas 

include vehicles, farm machinery, and semi-tractor trailer trucks. Accordingly, existing ambient noise levels 

near project work locations are low. Background noise levels in rural areas typically range between 35 and 

45 dBA (Ldn) (USEPA 1974). The primary sources of noise in rural residential and agricultural areas are 

roadway traffic and farm machinery on a seasonal basis. Background noise levels are approximately 40 dBA 

in rural residential areas and 45 dBA in agricultural cropland with equipment operating. 

Typical noise-sensitive areas include residences, schools and day care facilities, hospitals, long-term care 

facilities, places of worship, libraries, and parks and recreational areas specifically known for their solitude and 

3-42 January 2008
3-43 January 2008

tranquility such as wilderness areas. Noise sensitive receptors near the proposed project include rural 

residences, low-density residential clusters, schools, places of worship, libraries, and areas specifically valued 

for solitude and tranquility. 

Existing human-caused noise sources that occur in and around the planned project area include, but are not 

limited to residents, visitors, vehicles, motorized and mechanical equipment, overhead aircraft, and 

surrounding residential and agricultural noise influences (NPS 2007). A NPS noise study conducted at the 

then Great Sand Dunes National Monument during July 1993 and October 1994 found background ambient 

noise levels averaged less than 45 dBA for 99 percent of the study, less than 40 dBA for 90 percent of the 

duration, and less than 35 dBA for 50 percent of the study. These findings are compatible with the USEPA 

data described above for rural residential and agricultural areas (USEPA 1974). 

3.11.2.2 Regulatory Framework 

Federal Regulations

The Noise Control Act of 1972 required the USEPA to established noise emission criteria and testing methods 

that applied mainly to transportation effects of noise. In 1974, the USEPA issued guidance levels for the 

protection of public health and welfare in residential land use areas. The guidance levels specified an outdoor 

Ldn of 55 dBA and an indoor Ldn of 45 dBA. These guidance levels are not considered as standards or 

regulations and were developed without consideration of technical or economic feasibility. 

OSHA regulations are designed to protect workers from occupational noise exposure. OSHA’s regulations 

provide for permissible noise level exposures as a function of the amount of time during which the worker is 

exposed. 

State Regulations

Colorado Statute 25-12-103, provides for maximum permissible noise levels for applicable activities that will be 

conducted in a manner so that any noise produced is not objectionable due to intermittence, beat frequency, or 

shrillness. The statute provides limits for sound levels of noise radiating from a property line (Refuge 

boundary) at a distance of 25 feet or more for certain time periods. Those limits are provided below in 

Table 3-8. 

Table 3-8 Maximum Permissible Noise Levels 

Zone 7:00 a.m. to next 7:00 p.m. 7:00 p.m. to next 7:00 a.m. 

Residential 55 dBA 50 dBA 

Commercial 60 dBA 55 dBA 

Light industrial 70 dBA 65 dBA 

Industrial 80 dBA 75 dBA 
4.0 Environmental Consequences 

4.1 Introduction 

The following sections describe the potential impacts of the Proposed Action Alternative, the No Federal 

Involvement Alternative and the No Mineral Exploration Alternative. The Proposed Action Alternative is the 

adoption of standards and environmental protective measures by USFWS to protect the surface estate and 

other resources of the Refuge from unreasonable damage during all phases of the currently planned 

exploration program by Lexam; some of these measures have already been adopted by the COGCC as 

conditions of approval for the seismic survey and well permit applications. Under the No Federal Involvement 

Alternative, Lexam’s planned exploration program will proceed without adoption of the USFWS’s proposed 

standards and measures, unless such standards and measures have already been adopted by the COGCC as 

special conditions in Lexam’s survey and drilling permits. Under the No Mineral Exploration Alternative, the 

United States would acquire the Refuge’s severed mineral estate or Lexam would choose not to go forward 

and Lexam’s planned exploration program would not proceed. 

Oil and gas exploration and production is an iterative process. The result of the currently planned two-well 

exploration program may be that no further exploration is warranted, additional exploration wells are necessary 

or that commercially developable quantities of oil and natural gas exist. It is not possible to determine in 

advance of the exploration program whether any further exploration or development is warranted or the layout 

and configuration of any additional wells and associated facilities including roads. 

If commercially developable quantities of oil are discovered, any additional wells could include a pumping 

system and adjacent storage tank from which crude oil would be hauled off the Refuge in tanker trucks to an 

oil refinery. If natural gas is discovered in commercial quantities, a subsurface transportation system would be 

required to an adjacent roadway at which point the gas would be further transported in a pipeline system 

located in road rights-of-way to the point of distribution. In a production scenario, techniques to minimize the 

impact of oil and gas development in the surface estate, such as directional drilling and drilling multiple wells 

from a single drill pad, are possible, although no determination can be made at this time regarding the 

feasibility of any of these alternatives on the Refuge. Lexam understands and agrees that additional NEPA 

analysis will be required if results of the planned exploration require additional activities as described above. 

Since the USFWS has not developed specific management plans for the planned project area, no reasonably 

foreseeable future actions have been identified. However, the USFWS could implement ground disturbing 

activities in the future in support of regular Refuge management activities. Such ground disturbing activities will 

be subject to applicable rules and regulations and such protection measures that the USFWS will impose on 

itself to minimize impacts. 

The cumulative impact study area for resources discussed in this EA includes the project area, the northern 

portion of the Refuge from the project area to CR T, the town of Crestone, the Baca Grande Subdivision, and 

areas immediately adjacent to the Refuge north of CR T, unless stated otherwise for a particular resource. No 

reasonably foreseeable projects were determined for this area (mines, oil and gas drilling, major construction 

projects). 

In 2008 USFWS will be attempting to describe habitat characteristics and bird use of wet meadows during late 

spring through early fall. In doing this USFWS will have developed predictive models to help managers 

anticipate vegetation and bird response to the traditional practices of spring flooding followed by hay harvest 

and/or grazing in late summer or spring flooding without being followed by hay harvest and/or grazing in late 

summer. 

4-1 January 2008
4.2 Geology, Mineral Resources, and Soils 

4.2.1 Effects of Lexam’s Planned Exploration Program 

Lexam’s planned exploration program is not expected to effect geological conditions or mineral resources. 

Construction of roads and drill pads is expected to cause minimal long term impacts to soils; the maximum 

amount of disturbance for Lexam’s planned exploration program is 14.5 acres of soils that would be disturbed 

or covered with Lexam’s access roads and drill pads. Potential impacts to soils from planned exploration 

activities include the removal of vegetation, soil compaction, increased susceptibility of the soils to wind and 

water erosion, loss of topsoil productivity, and contamination of soils with hazardous materials. Disturbance is 

expected to be short term since reclamation would commence as soon as drilling activities are concluded. 

Roads and drill locations would be contoured back to original contours and disturbed areas would be reseeded and temporary or permanent erosion control structures installed as needed. As discussed in 

Chapter 1.0, the COGCC Series 1000 Rules and the CDPHE storm water permit rules provide for specific soils 

handling and reclamation procedures. The stormwater permit requires revegetation goals that must be 

followed in order to terminate coverage under the permit. Because of the erosive nature of the soils and the 

semi-arid climate, complete revegetation and reclamation to the goal in the storm water rules (70 percent of 

original vegetation) may be a long term undertaking. 

In addition to the impact of road and drill pad construction, soils could be impacted by any spills of hazardous 

materials (petroleum fuels, lubricants, paints, and additives). The SPCC requires immediate containment of 

spills or releases. Because of the temporary nature of the operations, the quantity of materials (oils and fuels) 

on-site would be relatively small. Impacts from spills would be short term and limited to the immediate vicinity 

of the spill and impacted soil would have to be removed and disposed offsite in accordance with applicable 

rules. 

4.2.2 Proposed Action Alternative 

Under the Proposed Action Alternative, the USFWS would adopt protective standards and measures to ensure 

that Lexam’s planned exploratory drilling project does not unreasonably degrade or impact environmental 

resources. The impacts would be lowered with the implementation of protective measures proposed by the 

USFWS in addition to COGCC and CDPHE rules. USFWS Protective Measure #5 (construction to facilitate 

revegetation in accordance with COGCC rules with input from USFWS) reinforces COGCC’s site reclamation 

requirements and would grant USFWS an enhanced role in such reclamation. The provision for Environmental 

Monitors pursuant to USFWS Protective Measure #3 (trained environmental monitors) would help ensure that 

protective measures required by USFWS, COGCC, and CDPHE are adhered to and that operations are 

conducted in a manner that reduces impacts. Spills of hazardous materials would be contained and 

remediated according to applicable rules and regulations of the COGCC and CDPHE; Environmental Monitors 

required by USFWS Protective Measure #3 would further ensure that hazardous material spills are adequately 

contained and remediated. 

In summary, adoption of the Proposed Action Alternative will further reduce the minimal impacts to Refuge 

soils resulting from Lexam’s planned exploration program. 

4.2.2.1 Applicant Committed Protective Measures 

USFWS Protective Measures #3, #5, and #34: 

• Trained environmental monitors (#3); 

• Construction to facilitate revegetation in accordance with COGCC rules with input from USFWS (#5); 

and 

• Vehicles restricted to existing and proposed access roads and location (#34). 

4-2 January 2008
4.2.3 No Federal Involvement Alternative 

Under the No Federal Involvement Alternative, Lexam’s planned exploration program would be conducted 

under applicable COGCC and CDPHE rules and regulations, as well as the specific conditions that have 

already been incorporated into Lexam’s survey and drilling permits. A maximum of 14.5 acres of Refuge lands 

would be impacted by access road and drill pad construction as described in subsection 4.2.1 above. In 

addition, soils may be impacted by hazardous material spills. Because there would be no Environmental 

Monitors or enhanced input from USFWS into the site reclamation process and no restrictions on off-road 

vehicle use, there is a potential for greater impacts to the Refuge’s soils under this Alternative than the 

Proposed Action Alternative. 

4.2.4 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, Lexam’s planned exploration program would not go forward and 

the impacts to soils that have been identified in subsection 4.2.1 would not occur. Existing roads and twotracks would continue to be used for Refuge administration, maintenance and management. 

4.2.5 Cumulative Impacts 

4.2.5.1 Proposed Action 

No cumulative impacts have been identified for geology, minerals, or soils. Under the Proposed Action, the 

planned project would add 14.5 acres of roads and pads to existing infrastructure that was present when the 

Refuge was a working ranch. In addition to the Lexam Road, there are various gravel and unpaved roads used 

to access Refuge offices, pastures, water wells, and irrigation equipment. These roads would continue to be 

used for Refuge administration, maintenance and management. The planned exploration wells would be the 

only oil and gas wells drilled on the Refuge to date. A total of 18 exploratory oil and gas wells have been drilled 

in all of Saguache County, only a few of which had hydrocarbon shows and there is no hydrocarbon 

production in the county (Cappa and Wallace 2007). There are no other reasonably foreseeable future 

activities (RFFA) regarding oil and gas in the cumulative effects study area as Lexam’s planned activities are 

the only oil and gas permit applications of current record in the county (COGCC 2007). There are no RFFAs 

regarding road building or construction activities in the cumulative effects study area. 

4.2.5.2 No Federal Involvement Alternative 

Under the No Federal Involvement Alternative, there would be no cumulative impacts for the same reasons 

discussed above for the Proposed Action. 

4.2.5.3 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, there would be no cumulative impacts because no mineral 

exploration activities would occur. 

4.3 Air Quality 

4.3.1 Effects of Lexam’s Planned Exploration Program 

Air quality impacts of the planned activities consist of emissions from vehicles and drilling and support 

equipment. Dust emissions also would result from traffic on unpaved roads and locations. With regard to 

emissions from the drilling operation (primarily diesel exhaust), a drilling rig is not considered a stationary 

source in Colorado unless it remains at the same location for longer than 12 months. If it is located at a site for 

less than 12 months, it is considered a mobile/temporary source. Mobile sources, including non-road engines, 

are not regulated in Colorado from an air permitting standpoint. 

4-3 January 2008
The drill rig engine specifications are not known at this time, but the draw-works rating could conceivably range 

from 1,200 to 1,500 horsepower to drill wells to the planned depth. The drill rig would be powered with diesel 

fuel. 

The CDPHE Air Pollution Control Division (APCD) regulates sources of air pollutant emissions in Colorado. 

The method of registering air pollutant emission sources occurs through the filing of an Air Pollutant Emission 

Notice (APEN), and/or through a construction permit application. There are several exemptions from the 

requirement to file an APEN and a construction permit application. The exemptions from APEN requirements 

are outlined in Regulation No. 3, Part A, II.D. Sources are exempted because by themselves, or cumulatively 

as a category, they are deemed to have a negligible impact on air quality. 

Reg. 3, Part A.II.D.1.lll states, “Oil and gas exploration and production operations (well site and associated 

equipment) shall provide written notice to the Colorado Oil and Gas Conservation Commission of proposed 

drilling locations prior to commencement of such operations. Air Pollutant Emission Notices are not required 

until after exploration and/or production drilling, workovers, completions, and testing are finished.” 

The exemptions from construction permit requirements are outlined in Regulation No. 3, Part B, II.D. Reg. 3, 

Part B.II.D.1.a, which states that sources exempted from APEN filing requirements in Section II.D. of Part A of 

this regulation are exempt from having to obtain an air quality construction permit. Once the well is drilled and 

if production does not occur, the owner or operator shall submit written notice to the APCD indicating that the 

well was plugged, or that emissions are otherwise not reportable. 

COGCC and CDPHE rules direct oil and gas operators to take appropriate actions to reduce dust emissions 

from their activities. Dust emissions may result from traffic on unpaved roads and locations. CDPHE rules 

specifically exempt reporting of dust emissions for developments that total less than 25 contiguous acres of 

disturbance and less than 6 months in duration. However, operators are required to implement a fugitive dust 

control plan, which can include but are not limited to watering roads, graveling roads, and controlling vehicle 

speeds. 

Control measures to suppress dust emissions should minimize impacts. Emissions from drilling rig engines 

would occur, but since the activities would be short-term and would be conducted in compliance with 

applicable rules of the CDPHE and COGCC, the impacts of drill emission would be minimal. If water has to be 

hauled to the project area, there is increased likelihood of higher dust emissions from the additional road 

traffic. However, even under this scenario, the fugitive dust control plan would help limit these emissions to 

short-term, minimal impacts. 

4.3.2 Proposed Action Alternative 

The USFWS protection measures specifically address dust emissions, but do not address engine emissions. 

The USFWS is proposing that dust control measures be implemented near water bodies for the protection of 

sensitive aquatic life. Under the Proposed Action, air quality impacts would be minimized by compliance with 

COGCC, CDPE rules. The impacts would be short term for the duration of the activities. Impacts of airborne 

dust to surface water would be minimized through implementation of USFWS Protection Measures #15 and 

#25. 

4.3.2.1 Applicant Committed Protective Measures 

• USFWS protection measure #15 requires dust suppression for the protection of aquatic habitat. 

• USFWS protection measure #25: Dust levels on regularly traveled access routes must be kept to a 

minimum. The Operator shall have a water truck and operator(s) readily available to perform dust 

abatement as needed, or as directed by the Refuge Manager or his authorized representative. Only 

water will be allowed for dust suppression efforts. Dust control measures shall be implemented 

4-4 January 2008
throughout the traveled areas of the project area in addition to the dust abatement requirement in 

measure #15. 

4.3.3 No Federal Involvement Alternative 

Under the No Federal Involvement Alternative, Lexam’s planned exploration program would be conducted 

under applicable COGCC and CDPHE rules and regulations, as well as the specific conditions that have 

already been incorporated into Lexam’s survey and drilling permits. Since the planned project activities would 

be conducted in compliance with applicable COGCC and CDPHE rules as described above, the impacts 

would be slightly more than the Proposed Action Alternative, and will not include Protective Measures #15 and 

#25. 

4.3.4 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, Lexam’s planned exploration program would not go forward and 

the impacts to air quality that have been identified in subsection 4.3.1 would not occur. Impacts of dust 

emissions from routine vehicle use for Refuge administration and maintenance and management would 

continue. 

4.3.5 Cumulative Impacts 

4.3.5.1 Proposed Action Alternative 

Past and current activities that contribute to air emissions in the cumulative impacts study area are emissions 

from vehicle traffic, equipment and seasonal emissions from residential heating. Lexam’s planned activities 

under the Proposed Action would result in a temporary increase in emissions in the area, but there would be 

no cumulative impacts to air quality since there are no RFFAs in the area that would contribute to future 

emissions. 

4.3.5.2 No Federal Involvement Alternative 

Under the No Federal Involvement Alternative, there would be no cumulative impacts as discussed above for 

the Proposed Action. 

4.3.5.3 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, there would be no cumulative impacts because no mineral 

exploration activities would occur. 

4.4 Water Resources 

4.4.1 Effects of Lexam’s Planned Exploration Program 

There are two types of potential impacts to surface water resources that could occur as a result of Lexam’s 

planned activities: 

• Increased sedimentation and turbidity of surface water as a result of ground disturbance and 

increased erosion into surface waters via runoff; and 

• Effects on water quality (i.e., potential contamination of surface water resources with drilling fluids, 

petroleum, or other chemicals used for natural gas drilling). 

The potential for adverse impacts would be greatest in the short term after the start of construction activities 

and would likely decrease in time due to natural stabilization, reclamation, and revegetation efforts. The 

magnitude of these potential impacts to surface water resources depends on, slope aspect and gradient, soil 

type, the duration and timing of the activities, and the success or failure of reclamation and protection 

4-5 January 2008
measures. Since revegetation may be a long term activity, any potential impacts to surface water also would 

be long term, however minimal. 

Potential impacts to ground water resources could include contamination of aquifers during drilling. Impacts to 

groundwater from drilling would be short term until protective casing is run and stops the fluid infiltration from 

the drilling mud. 

4.4.2 Proposed Action Alternative 

4.4.2.1 Surface Water Quality 

Protection of water quality is an important concern. Potential impacts to surface water include sedimentation 

due to runoff and erosion and contamination of surface water from spills. Specific USFWS measures to 

minimize impacts are listed below in Section 4.4.3 and are intended to eliminate or minimize potential short 

and long term impacts to surface water. The COGCC and CDPHE rules concerning erosion control and 

sedimentation also would minimize impacts to surface water quality. Surface water would be protected from 

contamination by establishing protective measures such as buffers between surface water and surface 

activities. Proper handing of hazardous materials in accordance with applicable rules and regulations also 

would minimize potential impacts. The primary hazardous materials to be used are fuels (diesel and gasoline), 

drilling mud additives, and cement. 

4.4.2.2 Groundwater Quality 

In order to protect groundwater quality, several conditions and measures would be implemented. A closedloop mud system would be used to eliminate the need for a drilling reserve pit, and drilling fluids and drill 

cuttings would be disposed of offsite. About 350 feet of surface casing would be run to protect the unconfined 

aquifer, and 3,000 feet of casing would be run to protect the confined aquifer. The casing strings will be fixed in 

place with cement pumped into in the annular space between casings or the borehole. The cement will fill the 

annular space from the depth where the casing is set to the surface. This will ensure that the aquifers are not 

only protected during drilling, but also are isolated from each other. 

The use of drilling mud is designed to lessen the impact to porous and permeable formations. The use of 

drilling mud is an accepted practice for drilling all types of wells including water wells, environmental monitoring 

wells, and utility borings. Drilling mud is designed to seal the sides of the borehole and minimize the infiltration 

of the fluid component of the mud into porous and permeable layers. Impacts are expected to be limited to less 

than a few feet from the borehole. After drilling, the use of cement to case the borehole would seal porous 

zones from further infiltration of drilling fluids. If the well is plugged and abandoned, COGCC rules require that 

cement plugs be placed over porous and permeable zones to protect aquifers. Over a period of time the filtrate 

would disperse into the formation by movement of groundwater. The impact of the mud filtrate is expected to 

be negligible. Impacts to water quality would be less than significant because of the protection measures of 

the USFWS and compliance with permit conditions and rules of the COGCC. 

4.4.2.3 Water Use 

Lexam is negotiating to obtain approximately 15 acre-feet of water for use in the planned project. The water is 

being obtained through agreement with the USFWS, which owns the water well source. The Colorado Division 

of Water Resources has regulatory authority over the agreement and is not subject to USFWS protective 

measures. Acquisition of the 15 acre-feet of water from a well provided by the USFWS would result in no 

impact to water supply on the Refuge, since Lexam would be required to offset the depletion of water it uses, 

as described in Section 2.2.2.5. Because of the water replacement agreement, there would be no impact to 

water supply on the Refuge. If a substitute water supply plan is not approved, then water would have to be 

purchased from an off-site source and trucked to the drilling locations. If water is brought in from an outside 

source, there would be no impacts to groundwater use on the Refuge. 

4-6 January 2008
4.4.2.4 Applicant Committed Protective Measures 

USFWS Protective Measures #6, #7, #13, #15, #27, #29, #30, #31, and #32, provide the following 

requirements: 

• Baseline sampling and analysis of surface and groundwater (#6); 

• Installation of monitoring wells at drill sites to monitor and quickly identify potential adverse conditions 

(#6); 

• Installing at least 3,000 feet of intermediate casing for aquifer protection (#7); 

• Locate activities as far as practicable from wetlands and water bodies (#13); 

• Restrict activities in 0.25-mile-wide buffer zones from important water habitats (#15); 

• Dust suppression near surface water bodies and throughout the project area (#15); 

• Baseline soil testing (#27); 

• Prohibition of pits, use of a closed-loop drilling fluid system to eliminate the need for a reserve pit and 

storage of drilling fluids and cuttings in tanks (#29); 

• Off-site disposal of unused drilling fluid and drill cuttings (#29); 

• Centralized storage of toxic materials and timely removal of waste materials when drilling operations 

have ceased (#30); 

• Catch pans under equipment such as pumps, fuel tanks, and generators (#31); and 

• No discharge of wastewater including sewage (#32). 

4.4.3 No Federal Involvement Alternative 

Under the No Federal Involvement Alternative, Lexam’s planned exploration program would be conducted 

under applicable COGCC and CDPHE rules and regulations, as well as the specific conditions that have 

already been incorporated into Lexam’s survey and drilling permits. Potential impacts to groundwater and 

surface water under the No Action Alternative would be minimized through the implementation of COGCC 

Permit Conditions #8, #9, #12, #15, and #16 in and compliance with applicable CDPHE rules. Permit 

conditions regarding protection of water resources were included into the drilling permits at the request of the 

USFWS. Without the stringent protective measures implemented by the USFWS, impacts to water resources 

are potentially greater. 

4.4.4 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, Lexam’s planned exploration program would not go forward and 

the impacts to water resources that have been identified in subsection 4.4.1 would not occur. Surface water 

conditions would not be expected to be materially different from current conditions. 

4.4.5 Cumulative Impacts 

4.4.5.1 Proposed Action 

No cumulative impacts to water resources have been identified and the USFWS. In addition, other than 

annual irrigation practices, no water projects have been identified in the cumulative effects study area which 

would create water-related cumulative impacts. 

4.4.5.2 No Federal Involvement Alternative 

Under the No Federal Involvement Alternative, there would be no cumulative impacts as discussed above for 

the Proposed Action. 

4-7 January 2008
4.4.5.3 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, there would be no cumulative impacts because no mineral 

exploration activities would occur. 

4.5 Vegetation and Habitats 

4.5.1 Effects of Lexam’s Planned Exploration Program 

Direct effects would include reduction and removal of vegetation, soil compaction, and potential increased soil 

erosion. These effects would result from the creation of access roads and pad locations. In addition, the 

introduction and establishment of invasive and noxious species could occur due to vehicles entering the 

Refuge. Disturbed areas would be more vulnerable to invasions by noxious species. Effects to vegetation may 

be long term given the semi-arid climate and erosive nature of the soils. 

To minimize the potential for direct effects to vegetation communities, construction and drilling activities would 

be conducted in accordance with all federal, state, and local laws and regulations and follow all of the COGCC 

permit conditions. All disturbed areas would be reclaimed according to the COGCC permit requirements and 

CDPHE regulations (as described in Section 1.6.1). To minimize the introduction of noxious and invasive plant 

species, the COGCC permit requirements and regulations would be implemented. According to COGCC 

permit condition #1, added at the request of USFWS, all equipment and vehicles brought onto the project area 

would be cleaned and decontaminated. 

4.5.2 Proposed Action Alternative 

4.5.2.1 Vegetation and Wetlands 

In addition to the laws and regulations of other governmental agencies, impacts to vegetation communities 

would be minimized through the implementation of USFWS protective measures as described in Section 2.2. 

Protective measures imposed by the USFWS include the addition of environmental monitors, extra law 

enforcement personnel to enforce state, federal, refuge, and wildlife laws, additional requirements as 

requested by the USFWS, and the modification of drilling activities as necessary to avoid conflicts with other 

Refuge management activities. Reclamation activities would be conducted to ensure that the construction of 

roads and well pads would occur in a way that best facilitates the complete reclamation of the disturbed areas 

once Lexam activities have ceased. 

Areas temporarily disturbed by construction and operation activities would be reclaimed as described above. In 

3 to 5 years following successful reclamation, these areas would provide food, cover and nesting wildlife 

habitat. However, it may require up to 15 to 20 years for vegetation communities, especially shrub 

communities, to return to predisturbance levels. Those areas disturbed by construction and operation activities 

would be temporarily unavailable to wildlife use and as habitat. Therefore, impacts to vegetation and wetlands 

would be less than significant. 

4.5.2.2 Noxious Weeds 

Under the Proposed Action Alternative, the introduction and establishment of invasive and noxious species 

would be minimized by decontamination of vehicles based on USFWS protection measures, and any 

additional requirements required by the USFWS. Impacts due to invasive and noxious weeds are expected to 

be less than significant. 

4.5.2.3 Sensitive Plant Species 

Only one sensitive plant species has been identified in the project area, the slender spiderflower. Impacts to 

this sensitive plant species in the project area have been minimized by avoiding as much as possible areas 

that may contain sensitive plants. In laying out the location of roads, the avoidance of areas containing the 

4-8 January 2008
slender spider flower was conducted under the direction of the USFWS. Based on the avoidance of the flower 

as determined during the growing season, impacts are expected to be less than significant. 

4.5.2.4 Applicant Committed Protective Measures 

The following applicant committed protective measures will lessen impacts to vegetation. 

• All vehicles and equipment from outside the Refuge will be decontaminated per USFWS procedures 

to prevent the introduction of noxious weeds to the Refuge (#1). 

• Impacts to sensitive habitat, wildlife, plants or other sensitive natural or cultural resource features will 

be avoided to the extent possible while constructing the access road and well pads (#4). 

• All construction of roads and pads will occur in a way that best facilitates their subsequent complete 

removal and reclamation once Lexam activities have ceased at these sites. This includes separating 

and stockpiling topsoil layers on-site to be replaced during reclamation. All disturbed areas will be 

reclaimed per the COGCC permit requirements and with USFWS input (#5). 

• Well sites will be located as far from sensitive wet meadow wetlands as practicable (#13). 

• All materials brought in to the Refuge to build up the location pad will be authorized by the Refuge 

Manager or his authorized representative. To minimize the spread of invasive species no top soils will 

be brought in from off Refuge (#18). 

• Upon completion of drilling operations, the Refuge Manager or his authorized representative must be 

advised within 120 days whether the well is to be retained or plugged. If the well site is to be 

abandoned, the well is to be plugged according to state law, all above ground structures removed and 

the site and road restored as directed by the Refuge Manager or his authorized representative. Any 

damage to existing surface vegetation, water channels, or other physical features shall be restored to 

original site conditions. All costs shall be born by the Operator (#28). 

4.5.3 No Federal Involvement Alternative 

4.5.3.1 Vegetation and Wetlands 

To minimize the potential for direct effects to vegetation communities, construction and drilling activities would 

be conducted in accordance with all federal, state, and local laws and regulations and follow all of the COGCC 

permit conditions. All disturbed areas would be reclaimed according to the COGCC permit requirements and 

CDPHE regulations as described in Section 1.6.1. Impacts would be greater than the Proposed Action 

Alternative since measures such as the USFWS requested re-route of the access road to Baca #5 to avoid 

dense populations of the slender spiderflower would not take place. Well sites and associated roads may 

have been located in sensitive wet meadow wetlands, thus impeding sheet water flows and potentially altering 

plant species composition and/or vigor. 

4.5.3.2 Noxious Weeds 

To minimize the introduction of noxious and invasive plant species, the COGCC permit requirements and 

regulations would be implemented. According to COGCC permit condition #1, added at the request of 

USFWS, all equipment and vehicles brought onto the project area would be cleaned and decontaminated. 

According to COGCC regulations, all disturbed areas shall be kept free of noxious weeds as practicable. 

However, impacts are potentially greater because there would be no on-site monitoring to ensure that vehicle 

contamination is done properly, no requirement allowing the Refuge manager to approve all construction 

material brought in and no requirement preventing the importation of topsoils onto the Refuge. 

4-9 January 2008
4.5.3.3 Sensitive Plant Species 

Under the No Federal Involvement Alternative, there would be no procedure to re-route roads in order to avoid 

the sensitive spider flower. Impacts to the slender spider flower would be greater than the Proposed Action 

Alternative. 

4.5.4 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, Lexam’s planned exploration program would not go forward and 

the impacts to vegetation that have been identified in subsection 4.5.1 would not occur. 

4.5.5 Cumulative Impacts 

4.5.5.1 Proposed Alterative 

No RFFAs that would result in cumulative impacts to vegetation and habitats have been identified in the 

cumulative effects study area. However, any future activities that may occur within the cumulative impact study 

area would be subject to federal, state, local, and Refuge laws and regulations that preserve native plant 

communities, protect sensitive plant species, and prevent the introduction of noxious and invasive plant 

species. 

4.5.5.2 No Federal Involvement Alternative 

Under the No Federal Involvement Alternative, there would be no cumulative impacts as discussed above for 

the Proposed Action. 

4.5.5.3 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, there would be no cumulative impacts because no mineral 

exploration activities would occur. 

4.6 Wildlife and Fisheries 

4.6.1 Effects of Lexam’s Planned Exploration Program 

Wildlife and fisheries species and related issues addressed by this analysis were determined through 

consultation with CDOW, CNHP, and USFWS. The primary issues related to wildlife and fisheries resources 

include the loss or alteration of native habitats, increased habitat fragmentation, animal displacement, direct 

loss of wildlife, and impacts associated with water crossings at Crestone and Willow creeks. However, the 

effects on wildlife species and their habitats would depend on factors such as the sensitivity of the species, 

seasonal use patterns, type and timing of project activity, and physical parameters (e.g., topography, cover, 

forage, and climate). 

4.6.2 Proposed Action Alternative 

Under the Proposed Action Alternative, the USFWS and Lexam have developed a number of protection 

measures in order to mitigate surface impacts to terrestrial wildlife, aquatic species, and special status species 

within the project area. However, there may be some unavoidable direct impacts to wildlife: a reduction or 

alteration of habitat, habitat fragmentation, and animal displacement. Additionally, there may be an increase in 

indirect impacts such as noise, human presence in sensitive habitats, and vehicle-related mortalities in areas 

with special status species. Impacts to wildlife and fisheries resources as a result of the planned project would 

be minimized by implementation of USFWS protective measures. 

4.6.2.1 Big Game 

Direct impacts to big game species (elk, mule deer, and pronghorn) would result from the incremental 

disturbance of habitat and increased habitat fragmentation. The loss of available vegetation would be 

4-10 January 2008
long-term (greater than 20 years), although herbaceous species may become established within 3 to 5 years, 

depending on reclamation success and future weather conditions. In most instances, suitable habitat adjacent 

to the disturbed areas would be available for these species until grasses and woody vegetation were 

reestablished within the disturbance areas. 

Other impacts to big game species would include increased animal disturbance as a result of increased noise 

levels and human presence. As a result, big game animals likely would decrease their use within 0.5 mile of 

surface disturbance activities (Ward 1976). 

Impacts to big game species are expected to be minimal because of USFWS protective measures and 

because of the temporary nature of the activities. Seasonal restrictions on activities would eliminate 

disturbance to birthing animals and animals caring for newborns. Fences would be used, if needed, to prevent 

animals from coming in direct contact with machinery and hazardous materials. Other measures would include 

restricting vehicle traffic to existing Refuge roads and reducing habitat fragmentation and habitat loss by 

limiting the construction of new roads. Preconstruction surveys for wildlife species including big game would 

occur in areas where the access roads and well pads would be built. Vehicle speed restrictions would reduce 

potential for road kill accidents. Impacts to mountain lions and black bears also would be expected to be 

minimal, based on the infrequent occurrence of these species within the project area. 

Because of the above protective measures impacts to big game species would be less than significant. 

4.6.2.2 Small Game 

Impacts to small game would be greater than those to large game because they are limited in their ability to 

temporarily relocate during periods of disturbance because of their smaller size. Temporary disturbances and 

habitat losses could cause unnatural movements of these species away from the disturbance and altered 

habitats, which may result in an increased vulnerability to predators. USFWS protective measures would 

minimize impacts to small game species. Seasonal restrictions on activities would eliminate disturbance to 

birthing animals and animals caring for newborns. Vehicle traffic would be restricted to existing Refuge roads 

or new access roads, thereby reducing habitat fragmentation and habitat loss by limiting the construction of 

new roads. Vehicle speed restrictions would reduce potential for road kill accidents. 

4.6.2.3 Non-game Species 

Impacts to non-game species are expected to be minimal because of USFWS protective measures. Vehicle 

traffic would be restricted to existing Refuge or new access roads, thereby reducing habitat fragmentation and 

habitat loss. Seasonal timing restrictions would eliminate disturbance to birthing animals and animals caring for 

newborn. Preconstruction surveys for wildlife species, including non-game species, would occur in areas 

where the access roads and well pads would be built, and sensitive habitat (e.g., wet meadows and riparian 

areas) would be avoided whenever possible. Vehicle speed restrictions would reduce potential for road kill 

accidents. 

4.6.2.4 Migratory Birds 

Impacts to migratory birds (waterfowl, shorebirds, passerines and raptors) are expected to be minimal because 

of USFWS protective measures. Vehicle traffic would be restricted to existing Refuge or new access roads, 

thereby reducing habitat fragmentation and habitat loss. Seasonal timing restrictions would eliminate 

disturbance to nesting birds and those with unfledged young. Preconstruction surveys for wildlife species, 

including migratory birds, would occur in areas where the access roads and well pads would be built, and 

sensitive habitat (e.g., wet meadows and riparian areas) would be avoided whenever possible. Vehicle speed 

restrictions would reduce potential for road kill accidents. 

4-11 January 2008
4.6.2.5 Fisheries 

Impact issues evaluated for aquatic communities (i.e., fish and amphibians) and sensitive fish species (i.e., Rio 

Grande sucker, Rio Grande chub) included potential effects of project activities on water quality and quantity 

and habitat in the Crestone Creek drainage. The occurrence of nongame fish is limited to Crestone Creek 

within the project area. The aquatic stages of amphibians could occur in Crestone, Willow, and Spanish creeks 

as well as in wet meadows during spring and fall months. Migrating amphibians in their terrestrial stages may 

still be occurring during the months of August over many wetter portions of the project area. Impacts to 

migrating amphibians in their terrestrial stages would be minimized by seasonal restrictions resulting in no 

activity being allowed on the Refuge during the peak migration times of June and July. 

Impacts to fisheries would be minimized by implementation of USFWS protective measures. Construction 

activities would maintain a distance of at least 0.25 mile from sensitive water crossings such as Crestone 

Creek. Vehicle traffic would be restricted along water crossings with fish present. Water quality monitoring 

would be conducted in waterways near construction activities to determine the presence of impacts due to the 

planned project and to enable implementation of protective measures to mitigate potential problems. 

4.6.2.6 Special Status Species 

The USFWS protective measures also would minimize impacts to special status species. Vehicle traffic would 

be restricted to existing Refuge roads and the new access roads, thereby reducing habitat fragmentation and 

habitat loss by limiting the construction of new roads. Preconstruction surveys for wildlife species including 

special status species, would occur in areas where the access roads and well pads would be built, and 

sensitive habitat (e.g., wet meadows and riparian areas) would be avoided. Therefore, impacts to special 

status species would be minimal. 

4.6.2.7 Applicant Committed Protective Measures 

USFWS Protective Measures #3, #4, #6, #8, #9, #12, #13, #14, #15, and #35 would provide for the following 

requirements: 

• Trained environmental monitors (#3); 

• Impacts to sensitive habitat, wildlife, or other sensitive natural resource features will be avoided while 

constructing the access road and well pads (#4). 

• Baseline water quality sampling and analysis of shallow groundwater and surface water in proximity to 

the planned well locations will be conducted prior to drilling (#6). 

• Implementation of a closed loop mud and drill cuttings system will be used to minimize impacts to 

surrounding habitats (#8). 

• Drilling operations will be modified, as necessary at the direction of USFWS, to reduce conflicts with 

other Refuge management activities (#9). 

• Seasonal restrictions (May 1 through July 31) on construction and drilling activities would avoid 

conflicts with birthing and/or nesting and the fledging of young birds (#12). 

• Well sites would be located as far from sensitive wet meadow wetlands as possible (#13). 

• Fencing of drill pads if necessary to prevent large ungulates from gaining access to the sites (#14). 

• Establish a 0.25-mile buffer zone of no activity around potential and identified sensitive species 

fisheries habitat (#15). 

• Limit vehicle crossings to existing or pre-approved crossings (#15). 

• All vehicle access will be restricted to developed roads and two-tracks (#34). 

• Vehicle speed restrictions would reduce potential for road kill accidents (#34). 

4-12 January 2008
4.6.3 No Federal Involvement Alternative 

Under the No Federal Involvement Alternative, impacts on terrestrial wildlife, aquatic species, and special 

status species were assessed based on standard rules and conditions of approval imposed by the COGCC, 

and other applicable rules and regulations of various federal and state agencies (e.g., CDOW and USFWS). 

No additional protective measures would be required by the USFWS to reduce impacts on wildlife resources. 

4.6.3.1 Big Game 

Impacts to big game under this Alternative would be slightly greater than under the Proposed Action 

Alternative since the protection measures listed in Section 4.6.3 would not be implemented. 

4.6.3.2 Small Game 

Impacts to small game under this Alternative would be greater than the Proposed Action Alternative since the 

protection measures listed in Section 4.6.3 would not be implemented. 

4.6.3.3 Nongame Species 

Impacts to nongame species under this Alternative would be the same as small game. 

4.6.3.4 Migratory Birds 

Impacts to migratory birds under this Alternative could be greater than under the Proposed Action Alternative. 

No restrictions on timing of drilling activities would result in some breeding birds being more limited in their 

ability to temporarily relocate during periods of disturbance because of fidelity to nests and unfledged young. 

This could result in nest abandonment and failure. 

4.6.3.5 Fisheries 

Impacts to fisheries under this lternative would be greater than under the Proposed Action Alternative. There 

would be no buffer zone around surface waters excluding construction activities and no monitoring of surface 

waters to monitor for potential impacts. Surface disturbance activities associated with construction of new 

roads could result in soil erosion within these floodplains (Garcia 2007). Construction activities could cause 

mortalities to amphibians during their occurrence in terrestrial habitats. 

Compliance with COGCC and CDPHE regarding handling of hazardous materials and chemicals would result 

in minimal impacts to Crestone, Willow, and Spanish creeks. Any spills would be contained and remediated 

according to applicable rules and regulation. Storage and containment measures would be used at the well 

pads to minimize any chemicals entering these drainages. 

4.6.3.6 Special Status Species 

Potential impacts to special status species would be the same or slightly greater than under the Proposed 

Action Alternative. Because there would be no protective measures by USFWS, direct impacts to special 

status species would include the incremental disturbance of habitat and increased habitat fragmentation. 

Impacts also could include mortalities of less mobile species (e.g., small mammals and amphibians), nest 

abandonment, and loss of eggs or young as a result of crushing from vehicles and equipment. However, 

potential impacts would be minimal because of the limited project area and temporary nature of the planned 

project. 

4.6.4 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, Lexam’s planned exploration program would not go forward and 

the impacts to wildlife and fisheries that have been identified in subsection 4.6.1 would not occur. 

4-13 January 2008
4.6.5 Cumulative Impacts 

4.6.5.1 Proposed Alternative 

The cumulative impact study area for wildlife resources is the Refuge. In the absence of known RFFAs on the 

Refuge, there would be no cumulative impacts to wildlife resources. 

4.6.5.2 No Federal Involvement Alternative 

Under the No Federal Involvement Alternative, there would be no cumulative impacts as discussed above for 

the Proposed Action. 

4.6.5.3 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, there would be no cumulative impacts because no mineral 

exploration activities would occur. 

4.7 Cultural Resources 

The Class III inventory identified one prehistoric lithic scatter (5SH3146), one historic canal (5SH3147.1), and 

four isolated finds. Site 5SH3146 and all four of the isolates were recommended as not eligible for the NRHP; 

no further work is recommended at these sites. The historic canal was recommended as eligible for the NRHP. 

4.7.1 Effects of Lexam’s Planned Exploration Program 

Direct effects to historic properties that could occur as a result of Lexam’s planned exploration program include 

disturbance or destruction of archaeological sites as a result of road or well pad construction. Indirect effects 

include vandalism, illegal collecting, or inadvertent destruction due to increased numbers of people (i.e., 

construction personnel) in the project area and increased erosion due to soil disturbance associated with 

construction activities. 

4.7.2 Proposed Action Alternative 

Under the Proposed Action Alternative, the USFWS would adopt protective standards and measures to ensure 

that Lexam’s exploratory drilling project does not unreasonably degrade or impact environmental resources. 

Lexam proposes to install a culvert to allow vehicular traffic to cross the NRHP-eligible canal (5SH3147.1) 

without affecting the historic character of the resource. Therefore, no direct adverse effects to the historic canal 

would occur as a result of the Proposed Action. 

To minimize the potential for indirect effects to historic properties, project personnel would be requested to 

perform contract operations in a careful and conscientious manner and to perform all work in accordance with 

all laws and regulations (Section 2.2). Little or no indirect effects to historic properties from modifications to 

erosion/sedimentation rates during drilling activities are anticipated. In accordance with applicant-committed 

environmental protection measures, all construction of roads and pads would occur in a way which best 

facilitates their complete removal and reclamation once Lexam activities have ceased at these sites. All 

disturbed areas would be reclaimed per the COGCC permit requirements and with input from the USFWS. 

Given the sand deposits throughout the area and specifically at the well pad and access road locations, 

monitoring of all proposed ground disturbance would be conducted by a qualified archaeologist (Section 2.2). If 

any previously unknown cultural resources are discovered during well pad and access road development, all 

construction activities would cease within the vicinity of the discovery and the USFWS Authorized Officer 

would be notified of the find. Steps would be taken to protect the site from vandalism or further damage until 

the USFWS Authorized Officer can evaluate the nature of the discovery as outlined in the Unanticipated 

Discoveries Plan, which is being prepared by Western Cultural Resource Management, Inc. Construction 

would not resume in the area of the discovery until the USFWS Authorized Officer has issued a notice to 

proceed. 

4-14 January 2008
If construction or other project personnel discover what may be human remains, funerary objects, or items of 

cultural patrimony, construction would cease within the vicinity of the discovery, and the USFWS Authorized 

Officer would be notified of the find. Any discovered Native American human remains, funerary objects, or 

items of cultural patrimony would be handled in accordance with NAGPRA. Non-Native American human 

remains would be handled in accordance with Colorado law. Construction would not resume in the area of the 

discovery until the USFWS Authorized Officer has issued a notice to proceed. 

All known historic properties identified within the APE would be avoided by project construction. Archaeological 

monitors would be present during ground-disturbing activities in the event subsurface materials are 

discovered. Any previously unknown historic properties that may be discovered during ground-disturbing 

activities would be protected in accordance with the Unanticipated Discoveries Plan. Therefore, no additional 

protection measures or monitoring are recommended. 

4.7.2.1 Applicant Committed Protective Measures 

• All known archaeological resources identified within the APE would be avoided by project construction 

(#2). 

• Archaeological monitors would be present during ground-disturbing activities in the event subsurface 

materials are discovered (#3). 

• Impacts to sensitive habitat, wildlife, plants or other sensitive natural, cultural or historical resource 

features will be avoided to the extent possible while constructing the access road and well pads (#4). 

4.7.3 No Federal Involvement Alternative 

Under the No Federal Involvement Alternative, Lexam’s planned exploration program would be conducted 

under applicable COGCC rules and regulations as well as the specific conditions that have already been 

incorporated into Lexam’s survey and drilling permits. No Archaeological monitors would be present during 

ground disturbing activities which would increase the chance of impacts to historic resources in the event of 

unanticipated discoveries during construction. 

4.7.4 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, Lexam’s planned exploration program would not go forward and 

the impacts to cultural resources that have been identified in subsection 4.7.1 would not occur. Archaeological 

discovery is often dependent upon ground-disturbing activities. If drilling activities do not occur, there is less 

potential of the discovery of archaeological resources. 

4.7.5 Cumulative Impacts 

4.7.5.1 Proposed Action 

The cumulative impact study area for cultural resources encompasses the Refuge. Under the Proposed 

Action Alternative, no adverse effects to archaeological resources would occur; therefore, there would be no 

incremental impact to historic properties when added to past, present, and RFFAs within the cumulative impact 

study area. 

4.7.5.2 No Federal Involvement Alternative 

Under the No Federal Involvement Alternative, there would be no cumulative impacts as discussed above for 

the Proposed Action. 

4.7.5.3 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, there would be no cumulative impacts because no mineral 

exploration activities would occur. 

4-15 January 2008
4.8 Native American Traditional Values 

The effects of federal undertakings on TCPs or places of religious and cultural significance to contemporary 

Native Americans are given consideration under the provisions of EO 13007, AIRFA, NAGPRA, and recent 

amendments to the NHPA. As amended, the NHPA now integrates Indian tribes into the Section 106 

compliance process, and also strives to make the NHPA and NEPA procedurally compatible. Furthermore, 

under NAGPRA, culturally affiliated Indian tribes and federal agencies jointly may develop procedures to be 

taken when Native American human remains are discovered on federal lands. 

4.8.1 Effects of Lexam’s Planned Exploration Program 

Potential direct and indirect impacts to Native American traditional values as a result of the Lexam’s planned 

exploration program would be the same as those described for cultural resources in Section 4.7. Governmentto-government consultation between the USFWS and tribal representatives was initiated on September 20, 

2007, and currently is ongoing. To date, no TCPs or places of cultural and religious importance to the tribes 

have been identified either during the cultural resources inventory or through tribal consultation. 

If a TCP or place of cultural and religious importance is identified by tribal representatives, no surface 

disturbance would occur within or immediately adjacent to the boundary of the property prior to completion of 

all consultation required by law. If data recovery or other form of mitigation is required at a TCP or place of 

cultural and religious importance, a data recovery or mitigation plan would be reviewed and approved by the 

USFWS and SHPO. Tribal representatives would be asked to participate in the development of any such data 

recovery or mitigation plan. Therefore, no adverse effects to Native American traditional values are anticipated 

as a result of Lexam’s planned exploration program. 

4.8.2 Proposed Action Alternative 

Potential direct and indirect impacts to Native American traditional values as a result of the Proposed Action 

Alternative would be the same as those described for Lexam’s planned exploration program in 

subsection 4.8.1. 

No adverse effects to Native American traditional values are anticipated as a result of the Proposed Action 

Alternative. 

4.8.3 No Federal Involvement Alternative 

Under the No Federal Involvement Alternative, Lexam’s planned exploration program would be conducted 

under applicable COGCC rules and regulations, the provisions of EO 13007, AIRFA, NAGPRA, and recent 

amendments to the NHPA, as well as the specific conditions that have already been incorporated into Lexam’s 

survey and drilling permits. Under this Alternative, potential effects to Native American traditional values would 

be the same as described for the Proposed Action Alternative (Section 4.8.2). 

4.8.4 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, Lexam’s planned exploration program would not go forward and 

there would be no effects to Native American traditional values. 

4.8.5 Cumulative Impacts 

4.8.5.1 Proposed Action 

The cumulative impact study area for Native American traditional values encompasses the Refuge. To date, 

no TCPs or places of cultural and religious importance have been identified by tribal representatives. If any 

properties of tribal importance are identified, the properties would be protected under the same laws and 

regulations that protect important cultural resources. Therefore, no adverse effects to Native American 

4-16 January 2008
traditional values are anticipated as a result of the Proposed Action Alternative and no incremental impacts to 

these values would occur when added to past, present, and reasonably foreseeable future actions within the 

cumulative impact study area. 

Reasonably foreseeable future actions that may occur within the cumulative impact study area would be 

subject to federal and state laws that protect TCPs and places of cultural and religious importance to Native 

Americans. Class III inventories and government-to-government consultation would be completed for any 

future proposed development, and potential adverse effects to any Native American traditional values would 

be avoided or mitigated as appropriate. 

4.8.5.2 No Federal Involvement Alternative 

Under the No Federal Involvement Alternative, there would be no cumulative impacts as discussed above for 

the Proposed Action. 

4.8.5.3 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, there would be no cumulative impacts because no mineral 

exploration activities would occur. 

4.9 Recreation 

4.9.1 Effects of Lexam’s Planned Exploration Program 

Lexam’s planned exploration program would have no impacts to recreation resources as the Refuge is not 

currently accessible to the public. The planned activities would not diminish recreational opportunities outside 

of the Refuge, such as at Great Sand Dunes National Park, the portions of which are within a mile from the 

project area. 

4.9.2 Proposed Action Alternative 

The Proposed Action Alternative would have no impacts to recreation resources because the Refuge is not 

accessible to the public. 

4.9.3 No Federal Involvement Alternative 

The No Federal Involvement Alternative would have no impacts to recreation resources because the Refuge is 

not accessible to the public. 

4.9.4 No Mineral Exploration Alternative 

Under the No Mineral exploration Alternative, Lexam’s planned exploration program would not go forward and 

there would be no impacts to recreation. 

4.9.5 Cumulative Impacts 

4.9.5.1 Proposed Action 

Since the Proposed Action Alternative would result in no impacts to recreation resources, there would be no 

cumulative impacts. 

4.9.5.2 No Federal Involvement Alternative 

Under the No Federal Involvement Alternative, there would be no cumulative impacts as discussed above for 

the Proposed Action. 

4-17 January 2008
4.9.5.3 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, there would be no cumulative impacts because no mineral 

exploration activities would occur. 

4.10 Socioeconomic Resources 

4.10.1 Effects of Lexam’s Planned Exploration Program 

4.10.1.1 Economy 

Lexam’s planned exploration program is expected to employ approximately 20 personnel on-site for the 

duration of approximately 4 to 5 months. The exploration itself would be contained within the Baca Refuge; 

however, project personnel are likely to lodge in Alamosa for the duration of the project. The presence of 

project personnel in Alamosa would generate a small amount of additional income for local businesses; 

motels, dining establishments, gas stations, etc. Alamosa County generates about $100,000 in lodging tax 

revenue (Colorado State Cooperative University Extension 2006), and the additional income would be a small 

fraction of that revenue. However, the additional room receipts and other personal expenditures would be a 

minor beneficial impact. 

4.10.1.2 Traffic 

Lexam’s planned exploration program would generate additional traffic on local roads, notably CR T, and 

temporary traffic delays may occur when large equipment is moved to the planned drill sites. Movement of 

large equipment would be regulated by the Colorado DOT and may involve temporary lane closures or traffic 

detours to accommodate wide loads. Depending on the day of the week and time of day, such disruptions 

may cause a temporary negative impact on existing local traffic patterns. 

In the event water is required to be trucked in to the drill sites, as many as 250 tanker truck loads per well may 

be required and will increase the impact on existing local traffic patterns. 

4.10.1.3 Emergency Services 

Local emergency services may potentially be called upon during Lexam’s planned exploration program in the 

event that an emergency situation develops. The local emergency response team’s capabilities and assets 

include Emergency Medical Service transport services, a fully trained Hazmat team, police and firefighters, 

and a Level III trauma center. In addition, three of the COGCC permit conditions are relevant to the local 

community emergency response: 

• Prior to commencing operations, an inventory of all chemicals and products that will be used or stored 

on site must be provided to the COGCC, the surface owner, and local emergency response personnel 

prior to bringing those materials on to the Refuge. If additional chemicals or products are required, 

then information about these substances must be provided to the COGCC, the surface owner, and 

local emergency response personnel prior to bringing them on to the Refuge. 

• Prior to commencing operations, a meeting with the local emergency response personnel will be held 

to establish an adequate safety and response plan for drilling activities. 

• Prior to rig-up, Lexam, in concert with its selected drilling contractor, will prepare an Emergency 

Preparedness Plan covering exploratory drilling, well control, materials hauling, spill response, and fire 

evacuation. The plan will be provided to the Refuge Manager and local governments. The provisions 

of the plan will be discussed in a pre-operation meeting to be held with Refuge management and local 

governments. The plan shall contain a telephone list naming key contacts for emergency operations 

and activation. Deficiencies in local emergency services will be identified and measures to emergency 

response will be discussed and implemented. 

4-18 January 2008
4.10.1.4 Other Socioeconomic Resources 

Lexam’s planned exploration program would not have an impact on regional demographics, housing, or land 

use. There are no Environmental Justice issues relating to Lexam’s planned exploration, as the Crestone and 

Baca Grande subdivision area does not comprise a low income or minority population. 

4.10.2 Proposed Action Alternative 

Under the Proposed Action Alternative, Lexam’s planned exploratory drilling project would be conducted within 

the COGCC rules and permit conditions and additional measures adopted by the USFWS to ensure that the 

project does not unreasonably degrade or impact the surface estate. Socioeconomic impacts under the 

Proposed Action Alternative would be similar to those described above in subsection 4.10.1 as no additional 

measures or standards relating to socioeconomics have been adopted by the USFWS. 

4.10.3 No Federal Involvement Alternative 

Under the No Federal Involvement Alternative, Lexam would conduct their exploratory project within standard 

COGCC rules and permit conditions. Socioeconomic impacts under the No Action Alternative would be the 

same as those described above in subsection 4.10.1. 

4.10.4 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative exploratory drilling for gas and oil would not occur. The traffic 

impacts of heavy equipment on local roads would not occur. The economic benefits that would have occurred 

from drilling activities would be lost. Other activities might take place on the Refuge, including scientific studies 

and surveys and maintenance projects that might attract small numbers of people to the area. 

4.10.5 Cumulative Impacts 

4.10.5.1 Proposed Action 

Because no RFFAs have been identified in the cumulative effects area and socioeconomic impacts are 

anticipated to be minimal and temporary, there would be no cumulative impacts. 

4.10.5.2 No Federal Involvement Alternative 

Under the No Federal Involvement Alternative, there would be no cumulative impacts as discussed above for 

the Proposed Action. 

4.10.5.3 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, there would be no cumulative impacts because no mineral 

exploration activities would occur. 

4.11 Aesthetics 

There were numerous concerns about the effects of the planned project on the setting of the area surrounding 

the planned project. The visual aspects and quietness are highly prized values for area residents. The issues 

addressed under aesthetics, visual resources and noise, address the potential impacts to the values 

expressed by residents of the area. 

4.11.1 Visual Resources 

4.11.1.1 Effects of Lexam’s Planned Exploration Program 

This section discusses potential visual impacts associated with the project’s drill rig, facility lighting, drill pads 

(2), upgraded access roads, and ancillary facilities. Project activities would be temporary, lasting 

4-19 January 2008
approximately 120 to 180 days. The dominant facility would be the drill rig, which would be approximately 

135 feet in height. The project would create nighttime glare from the light of the drill rig and facilities that would 

be seen from viewers in the surrounding viewshed. 

The drill rig, facility lighting, roads, and drill pads, which may be visible by viewers at a distance of 2.0 miles or 

greater, would create an adverse aesthetic impact. This visual impact is estimated as less than significant due 

to the middleground to background viewing distances. While nighttime glare from facility lighting would have 

an adverse affect on viewers, it is estimated that the impact would be less than significant. This glare would 

reduce the darkness of the night sky and degrades viewers’ enjoyment of the nighttime sky from secluded 

residences, trails, and recreation areas. It is possible that lighting may also have an affect on wildlife. The glare 

is incompatible with the mostly dark nighttime sky of the undeveloped areas near the project area. However, 

the lights are needed to allow for the safe operation of the facility at night and to comply with OSHA 

regulations. Although shielded lighting could potentially reduce the nighttime glare, even the most rigorously 

mitigated lighting plan would not completely eliminate nighttime glare from a facility that must comply with 

OSHA’s lighting requirements. 

The drilling rig would be visible during clear days, but differing vantage points would affect visibility. The tallest 

object in the project area is a tall cottonwood tree that is an estimated 53 feet tall and is visible for long 

distances. The rig being over 2 times taller than this tree also would be visible over distances of several miles. 

It would be especially visible from north of the project area along CR T. Looking down from the higher 

elevations to the east, the rig may not stand out above the horizon at a distance of more than a few miles. 

Atmospheric conditions such as wind-blown dust and haze also would affect view of the rig. On cloudy, windy, 

or snowy days, the rig would be less visible or not visible. 

Diminishment of the viewshed is a concern with regard to visitors to the Great Sand Dunes National Park 

located adjacent to the Refuge. The closest proposed location (Baca #7) is 2 miles from the extreme northern 

boundary of the park (Figure 1-1), but is about 18 miles northwest of the park visitor center. The vast majority 

of visitors to the park will be at the visitor center and immediate environs. Although the rig would not be 

viewable at a distance of 18 miles, the elevation of the dunes immediately to the north and northwest would 

preclude viewing from the visitor center. The nearest that potential visitors traveling to the park would be to the 

project area is if they were traveling on State Highway 17. From the nearest point on Highway 17, travelers 

would be at least 6 miles due west of the project area. At that distance, the rig would be hard to discern by the 

casual viewer. At night, lights from the project area would not likely be distinguishable from the lights of 

Crestone and the Baca Grande Subdivision that are directly in the line of sight to the east and northeast of the 

project area. It is possible that a few park visitors could view the rig from the northern extent of the park, but as 

stated above, the park boundary is at least 2 miles from the closest proposed location and it is not likely that 

many visitors would be present in that part of the park. 

Fugitive dust emissions from vehicle traffic also would present visual effects. 

The presence of the drill rig, facility lighting, roads, and drill pads, by viewers from the perimeter of the Refuge, 

would create an adverse aesthetic impact; however, viewing at distances of 2.0 miles or more would diminish 

the impact. The impacts would be temporary in nature. Therefore, visual impacts would be less than 

significant. 

4.11.1.2 Proposed Action Alternative 

 No special protection measures are recommended specifically for visual resources; however Lexam will 

ensure to the extent possible for safety that lights on the drilling rig and location are directed to work areas. 

The air quality protective measure of wetting down roads would reduce the visual effects of dust emissions. 

4-20 January 2008
4.11.1.3 No Federal Involvement Alternative 

Impacts associated with the No Federal Involvement Action Alternative would be similar as those described for 

the Proposed Action Alternative because of dust abatement requirement as required by the CDPHE 

(Section 4.3.1). 

4.11.1.4 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, Lexam’s planned exploration program would not go forward and 

the visual effects that have been identified in subsection 4.11.1.1 would not occur. 

4.11.2 Noise 

This section analyzes the potential noise effects of the planned exploration program, which would emanate 

from the access roads and drilling locations. 

4.11.2.1 Effects of Lexam’s Planned Exploration Program 

Road construction, vehicle operation, and drilling equipment operation would be the sources of noise above 

ambient levels. The planned exploration program is located in a setting that can be characterized as rural, 

where ambient noise levels range from 35 to 45 dBA. Noise is attenuated as the distance from the source to 

the receptor increases. 

Noise monitoring results of natural gas drilling rigs at the Pinedale Anticline in Wyoming recorded the highest 

average noise levels of 66.8 dBA at 130 feet from the drilling rig in various directions around the rig (ENSR 

2007). The drilling activity that is most likely to produce the highest noise levels is drill pipe moving in or out of 

the hole (tripping). Based on the average 66.8 dBA reading 130 feet from the derrick, noise attenuation 

calculations (Engineering Page 2007) indicate that at a distance of 2,000 feet from the rig, noise levels would 

attenuate to 43.1 dBA, within the ambient noise range for the setting of the proposed project and well below 

the Colorado statutory maximum permissible noise level in a nighttime residential setting (50 dBA). Because 

noise effects would be at ambient levels at 2,000 feet or less from the rig, and the activities would be 

temporary in nature, the effects of noise from the project are expected to be minimal. Noise may have an 

impact on wildlife, but beyond 2,000 feet from the source, those impacts are expected to be minimal. 

It is expected that Lexam will use a drilling rig (if available) equipped with a diesel-electric conversion type 

power system. A diesel electric power system uses diesel engines to power electric motors, which are the 

prime movers for the system. The use of the system allows for fewer spikes in noise when the rig is pulling 

heavy loads, as for instance, when tripping drill pipe out of the hole. It is not possible to remove all sources of 

noise, but Lexam will strive to obtain muffling equipment on all engines that will reduce sound levels to 

reasonable minimums. 

4.11.2.2 Proposed Action Alternative 

Impacts associated with the Proposed Action Alternative would be the same as those outlined above in 

subsection 4.11.2.1 as the USFWS has not adopted special protection measures specifically for noise effects. 

Lexam, however, has committed to the use of mufflers on drilling rig engines that are designed to further 

attenuate noise emissions and will a diesel-electric powered rig (if available) to further reduce noise. 

4.11.2.3 No Federal Involvement Alternative 

Impacts caused by potential noise effects would be the same for the No Federal Involvement Alternative as 

those outlined above in subsection 4.11.2.1. Lexam, as stated above has committed to the use of mufflers on 

drilling rig engines that are designed to further attenuate noise emissions and use a diesel-electric powered rig 

(if available) to further reduce noise. 

4-21 January 2008
4-22 January 2008

4.11.2.4 No Mineral Exploration Alternative 

Under the No Mineral Exploration Alternative, Lexam’s planned exploration program would not go forward and 

the potential noise effects that have been identified in subsection 4.11.2.1 would not occur. 

4.11.2.5 Cumulative Impacts 

Proposed Action

Because minimal visual and noise effects are anticipated from the Proposed Action Alternative and no RFFAS 

in the cumulative impacts study area have been identified, there would be no cumulative impacts. 

No Federal Involvement Alternative

Under the No Federal Involvement Alternative, there would be no cumulative impacts as discussed above for 

the Proposed Action. 

No Mineral Exploration Alternative

Under the No Mineral Exploration Alternative, there would be no cumulative impacts because no mineral 

exploration activities would occur. 
5.0 Consultation and Coordination 

5.1 Introduction 

The USFWS is the lead agency for this EA. There are no cooperating agencies. 

5.2 Preparers and Reviewers 

Table 5-1 lists the preparers and reviewers who participated in preparing the Baca Refuge Gas Exploration 

Project Environmental Assessment. 

Table 5-1 List of Preparers and Reviewers 

Name Education/Experience Project Role 

U.S. Fish and Wildlife Service 

Connie Young-Dubovsky Regional NEPA Coordinator 

Mike Blenden Project Leader 

Mike Artmann Wildlife Biologist 

Meg Van Ness Regional Archaeologist/Native American 

Consultation 

Laura Archuleta Contaminants Biologist 

Ron Garcia Refuge Manager 

ENSR 

William Berg M.S. Geology, 

27 years experience 

Project Manager, Geology, Minerals, Soils, 

Hydrology, Air, Noise 

Chantal Cagle M.A. Anthropology 

23 years experience 

Project Coordinator 

Socioeconomics 

Merlyn Paulson M.LA. (Landscape 

Architecture) 

33 years experience 

Visual Resources 

Erin Bergquist M.S. Ecology, 

6 years experience 

Vegetation and Wetlands 

Charles Johnson M.A. Ecology 

14 years experience 

Wildlife Biology 

Matt Brekke B.S. Wildlife Biology, 

2 years experience 

Wildlife Biology 

Kim Munson M.A. Anthropology 

12 years experience 

Cultural Resources Native American 

Traditional Values 

Drew Ludwig M.S. Zoology 

35 years experience 

NEPA Specialist 

5-1 January 2008
5.3 Persons and Agencies Contacted 

The following persons and agencies were contacted in the process of preparing this EA. 

• Tom Lennon, Western Cultural Resource Management; 

• Michael Menefee-Environmental Review Coordinator, Colorado Natural Heritage Program; 

• Ron Rivale-District Wildlife Manager, Colorado Division of Wildlife; and 

• City of Alamosa Chamber of Commerce. 

5.4 Summary of Public Participation 

NEPA does not require public involvement in the development of an EA. However, the public must be informed 

of a completed EA. 

The USFWS recognized the importance of public involvement in the Baca Refuge Gas Exploration project and 

held an open house meeting on August 17, 2007, at the Baca Grande Property Owners Association Hall; the 

purpose of the meeting was to provide information to the public on gas exploration activities being conducted 

on the Refuge and the purpose of the EA and to solicit public input. Seventy-nine members of the public 

attended the meeting, and five comments were submitted at the meeting. USFWS allowed the public an 

additional 30 days in which to submit written comments. 

The San Luis Valley Ecosystem Council encouraged community input and provided suggested comments and 

alternatives on their website (http://www.slvec.org/lexam/scoping.html), and many of these comments were 

included in the letters received from the local communities. The Colorado College student community sent in 

several hundred form letters with personal comments added. The Natural Resources Defense Council (NRDC) 

stimulated many additional letters and widened the geographical coverage by providing an internet form letter 

on their website. 

In all approximately 48,500 individual letters or Emails were received. Approximately 97 percent (47,245) of 

the letters received were form letters generated through the NRDC website. Some of these letters had been 

edited prior to being sent, providing additional personal comments or opinions (including three that were in 

favor of the planned gas exploration). All of these comments were reviewed in preparation of the EA. 

The majority of the comments related to whether gas exploration activities should occur on the Refuge. In 

general, these comments raised issues and concerns relating to the potential impact of gas exploration 

activities on: 

• Groundwater (specifically the aquifers beneath the Refuge); 

• Air quality; 

• Wildlife and the Refuge ecosystem; 

• Cultural resources; and 

• Aesthetic resources (e.g., noise and visual impacts). 

Additionally, letters expressed concerns about the use and disposal of hazardous materials, heavy equipment 

traffic on local roads, and the issue of liability and mitigation of damages. A number of letters expressed 

discontent with the NEPA process and requested additional meetings or time to respond with comments, 

suggested an EIS be required, or that drilling be delayed until a comprehensive management plan has been 

developed for the Refuge. 

5-2 January 2008
5-3 January 2008

Prior to the NEPA process, USFWS hosted three public meetings specifically to gather public input and solicit 

concerns regarding Lexam’s proposed gas exploration on the Refuge. 

Special speakers, including the COGCC Director, representatives from Lexam, and citizens from areas where 

oil and gas activities occur were brought in for these meetings, the meeting minutes were posted on various 

community websites, and newspaper articles were published in the Valley Courier, Crestone Eagle and the 

Pueblo Chieftain about the planned activities to provide maximum public involvement. 
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Appendix A 

Protection Measures and Conditions 3-D Seismic Survey 

 January 2008 Lexam EA
Protective Measures and Conditions for Lexam Explorations (USA) 

To Conduct 3-D Seismic Survey 

USFWS, Baca National Wildlife Refuge 

Winter 2006-2007 

 

The USFWS management and operational procedures for the seismic survey which are 

designed to eliminate avoidable impacts to natural and cultural resources and physical 

infrastructure on the Baca National Wildlife Refuge (Refuge), and to control or reduce 

unavoidable adverse impacts. Those management and operational procedures are list 

below: 

1) The Refuge Manager and environmental monitors will retain the right to "stop work" 

in any situation that imperils a Threatened or Endangered species or its habitat, that 

causes significant harm to Refuge resources, that threatens cultural or historic resources, 

or that endangers public safety. Any sightings of cultural features or artifacts or sightings 

of threatened or endangered species by employees or contractors of Lexam will be 

immediately reported to the Environmental Monitor or the Refuge Manager. 

2) Lexam will, to the greatest extent practicable, conduct all exploration in such a manner 

as to minimize damage, erosion, pollution or contamination to the lands, waters, 

facilities, vegetation and other resources of the refuge. 

3) As far as is practicable, all operations must be conducted without interference with the 

operation of the Refuge or disturbance to the wildlife thereon. 

4) The physical occupancy of the area must be kept to the minimum space compatible 

with the conduct of efficient mineral operations. 

5) Upon the cessation of operations, the area shall be restored as nearly as possible to its 

condition prior to the commencement of seismic operations. 

6) Third-party environmental monitor(s) may be hired at Lexam’s expense to ensure 

compliance with Refuge regulations and protective measures. Lexam will pay reasonable 

total cost of this requirement, as mutually agreed with the Refuge Manager prior to the 

hiring of the environmental monitors. The environmental monitor(s) will be hired with 

prior approval of the Refuge Manager, and will report directly to the Refuge Manager. 

The environmental monitors will be provided a radio and a cell phone for 

communications with crews. 

7) Lexam is responsible for any damage caused by it’s employees or contractors hired by 

Lexam involved in the operations, and for restoring impacted areas as closely as possible 

to original conditions prior to the end of operations. Lexam will be responsible for 

restoration of and/or mitigation for all damages to Refuge habitats, and for repairing any 

damages to Refuge facilities and infrastructure including roads, parking areas, levees, 

fences and water control structures. 
8) The USFWS will enforce all applicable Federal statutes and regulations, including all 

Refuge specific regulations. 

 

9) Monitoring Program: One or more environmental monitors should be on duty at all 

times. Additional monitors will be on duty when determined necessary by the Refuge 

Manager. Daily operations logs shall be kept by the environmental monitors and the 

operations project manager. These logs should document all daily activities as well as any 

damages to habitats or infrastructure. Daily updated logs will be made available to the 

Refuge Manager (or assignee) and Lexam (or assignee) each morning and a final 

composite log will be given to the Refuge Manager and Lexam upon completion of the 

program. 

10) The shot line and receiver line pattern will be designed and operations conducted so 

as to minimize mechanized equipment traffic along the line and lessen the overall time 

required to conduct recording operations. 

11) The seismic program will be initiated in the southwest portion of the Refuge and will 

progress from southwest to northeast. 

12) Training Program. Training of all seismic program personnel will be conducted prior 

to commencing seismic activities through orientation meetings. Training will include 

review of the provisions and protection measures and review of Refuge-specific and 

general regulations applicable to national wildlife refuges. Training will be repeated 

periodically throughout the program prior to each phase of the operations and/or as new 

personnel begin work on the Refuge. 

13) In the event of adverse weather conditions, the Refuge Manager may halt all seismic 

operations. Should work be delayed for this reason the Refuge Manager is authorized to 

extend the period of operation up to an additional thirty (30) days. 

14) Measures to Protect Cultural Resources 

• A file search to be performed by an archaeologist to identify any known cultural 

sites. The archaeologist will also identify and map high probability areas within 

the area of the seismic survey, and mapped buffer zones around all known sites 

and high probability areas. 

• All cultural resources identified in the file search and all high probability areas 

will be mapped and/or flagged in the field by the archaeologist prior to beginning 

seismic operations, and such sites will be avoided by seismic field crews during 

all phases of the seismic survey. No seismic survey activities will occur in buffer 

zones of 100' radius around identified sites and high probability areas. 

• The seismic survey will only use the low-impact seismic survey methodology 

specified in the "Seismic Methodology and Sensitive Area Avoidance Plan." 
• Staging areas for the seismic survey will be off Refuge property. 

• Any discovery of cultural artifacts or features during the course of the seismic 

survey will be immediately reported to the USFWS and the SHPO. The Refuge 

Manager and the environmental monitor(s) will have "stop work" authority for 

any activity that may threaten a cultural artifact or feature. 

15) Measures to Protect Migratory Birds, Other Wildlife, and Habitats 

• The timeframe for conducting the seismic survey will be January 01, 2007 to 

February 28, 2007, to reduce or altogether eliminate disturbance impacts to 

migrating/breeding migratory birds including waterfowl, shorebirds and wading 

birds. T-C understands that an earlier completion date is preferable, and will strive 

to complete the survey at the earliest possible date. 

• Shifting of the seismic source or receiver lines and subsequent operations will be 

required to avoid active unanticipated wildlife concentrations or other sensitive 

wildlife features. 

• Killing or harassing all wildlife on the Refuge is prohibited. Spotlighting of 

wildlife by crews will be prohibited. 

• Potential vegetation damage and soil compaction/rutting along source and 

receiver lines will be reduced by: 1) restricting the number of vehicle passes along 

the lines to the absolute minimum required. Polaris will limit receiver line checks 

to the absolute minimum possible. Wherever possible, laying and servicing 

receiver equipment will be accomplished by walking. Natural and man-made 

travel lanes, (roads and trails) will be utilized whenever possible; 2) using fourwheelers where necessary in uplands and drier transitional sites; 3) minimizing 

turning by tracked vehicles (no locking tracks); 4) prohibiting all "cross-country 

travel" by mechanized vehicles. 

• Damage to levees, ditches, and other waterway banks and shorelines will be 

minimized to the extent possible by: 1) conducting recording activities all on one 

side of a waterway in a portion of the project area before proceeding to the 

opposite side, thereby minimizing crossings; and 2) avoiding lateral travel along 

banks and shorelines. 

• Polaris will pressure wash and chemically decontaminate with approved 

herbicides all vehicles and receiving equipment prior to deployment on the 

Refuge to avoid introducing any foreign plants or animals. Vehicles and receiving 

equipment will be inspected by the environmental monitor(s) prior to entering the 

Refuge. 

• All work will be conducted during daylight hours unless approved or requested by 

refuge manager. 
• Staging areas, and vehicle travel lanes will be approved by the Refuge Manager 

following a coordinated field review with Polaris. 

• Sensitive habitats including Riparian and wet areas will be identified and avoided 

by shifting source and receiver lines and subsequent operations. 

• All vegetation damage and soil compaction/rutting will be restored by Polaris as 

nearly as possible to its condition prior to commencement of seismic operation, or 

will be mitigated for as specified by the Refuge manager. 

16) Other Measures 

 

• Polaris will establish and identify to the USFWS a designated point of contact 

who will be available at all times for communication and coordination with the 

USFWS. 

• All water control structures, wells and water gauges will be avoided except as 

authorized by the Refuge Manager. 

• The USFWS and Polaris will cooperatively develop a Contingency Plan to cover 

the potential occurrence of project-related or other incidences of wildfire during 

the seismic survey. Survey crews will carry basic fire suppression equipment 

(shovels, fire extinguishers, etc.). Crews will report any occurrence of wildfire to 

Refuge management. 

• Possession of firearms is prohibited by Refuge regulation. Possession of firearms 

is also prohibited by Polaris policy and is enforceable by dismissal from 

employment. 

• In the event that any roads, trails, parking areas, levees, and other infrastructure 

are impacted by the seismic survey, these resources will be immediately repaired 

at Polaris' expense. Polaris will be required to maintain all Refuge facilities used 

during the seismic survey, and repair any damages caused by Polaris’ use of these 

facilities. 

• All damaged fences (barbed and electric) breached by the seismic survey will be 

repaired at Lexam’s expense in a timely manner, and in a manner agreed upon by 

the Refuge Manager. 

• Field oil or fluid changes will be permitted on the Refuge in selected staging 

(administrative) areas determined by the Refuge Manager. Any spilled oil will 

require immediate cleanup. Therefore, oil absorbent pads will be required on site 

at all times as a precautionary measure. 

• Polaris will provide the Refuge Manager with proof of environmental liability 

insurance or post a bond prior to the initiation of seismic surveys. 
• Strict adherence to Polaris Drug and Alcohol Policy will be enforced for all 

employees, contractors, and subcontractors. Violation of this policy will be 

grounds for immediate dismissal. 

• All cans, bottles, paper, and other trash generated by the seismic crew will be 

removed from the Refuge daily. Trash receptacles provided by Polaris for its 

employees/contractors must be emptied and trash removed from the Refuge on a 

daily basis. 

• All equipment and debris incidental to the survey, such as flagging, wires, poles, 

etc., will be removed following the cessation of activities on each line. 

• Polaris will advise the Refuge Manager at least 72 hours in advance of the initial 

survey activities and shall coordinate all activities during the seismic survey on 

the Refuge with the Refuge Manager. 

• The Refuge Manager will be provided detailed maps showing the exact locations 

of all seismic survey lines and shot holes promptly after survey completion. 

• All applicable Federal and State regulations, including all Refuge-specific 

regulations shall be in force and adhered to by all seismic personnel at all times, 

except where explicitly exempted by the Refuge Manager. Seismic personnel 

shall comply with all, applicable ordinances, laws, decrees, statutes, rules and 

regulations of all federal and state entities. 

• The USFWS can request add or modify the protective measures during the 

seismic survey should additional or modified stipulations be needed to protect 

Refuge resources or public safety. 
Appendix B 

USFWS Manual, Land Use Series, 612 FW 2, Oil and Gas 

 January 2008 Lexam EA
Appendix C 

COGCC Permits Issued for Baca#5 and Baca #6 

 January 2008 Lexam EA
Colorado Oil And Gas Conservation Commission 

Conditions Of Approval 

April 3, 2007 

Lexam Explorations (U.S.A) Inc.: 

Baca No. 5 Well NE1⁄4 SW1⁄4, Section 28, Township 43 North, Range 11 East, 

N.M.P.M. 

Baca No. 6 Well SE1⁄4 NE 1⁄4, Section 33, Township 43 North, Range 11 East, 

N.M.P.M. 

1. Notify David Shelton - COGCC Engineering Supervisor (303-894-2100 x 

108) or David Dillon – COGCC Engineering Manager (303-894-2100 x 

104) 48 hours prior to moving onto the location with drilling equipment. 

Advise Mr. Shelton or Mr. Dillon at least 24 hours prior to running any 

casing string to provide COGCC Field Inspectors sufficient notification 

time to witness cementing operations and pressure testing of blowout 

preventers. If the well is a dry hole, notify Mr. Shelton or Mr. Dillon 24 

hours prior to plugging and abandoning this well. 

2. Any changes to the approved drilling plan and procedures must be 

approved in writing by the COGCC. 

3. Immediately notify the COGCC of any major problems encountered during 

the drilling, cementing, or completion process. 

4. Conductor casing and surface casing will be cemented to surface. 

5. Surface casing depth will be set at a depth of 3000 feet. This depth was 

determined by COGCC staff based upon review of available relevant data, 

including data from the deep water well located approximately one mile 

from the drill sites, and after consultation with the Division of Water 

Resources staff. 

6. Prior to commencing operations, an inventory of all chemicals and 

products that will be used or stored on site must be provided to the 

COGCC, the surface owner, and local emergency response personnel 

prior to bringing those substances on to the Baca National Wildlife Refuge. 

If additional chemicals or products are required, then information about 

these substances must be provided to the COGCC, the surface owner, 

and the local emergency response personnel prior to bringing them on to 

the Baca National Wildlife Refuge. 

7. Prior to commencing operations, a meeting with the local emergency 

response personnel will be held to establish an adequate safety and 

response plan for drilling, completion, and production activities. 

- 1 -
8. A closed loop mud and cutting system will be used and cuttings will be 

placed in an above ground and lined enclosure, unless landowner 

approval to use an alternative mud and cutting system is obtained in 

writing. 

9. The drill cuttings will not be left at or buried on the drill site or elsewhere 

on the Baca National Wildlife Refuge, unless landowner approval is 

obtained in writing. Cuttings will be disposed in accordance with COGCC 

Rule 907. 

10. Formation temperatures will be recorded and the data provided to the 

COGCC and the surface owner. 

11. If pumping tests are conducted on discrete zones below deepest 

neighboring water well (2,180 feet below surface), then water samples will 

be collected for basic water quality tests, including TDS, dissolved metals, 

common anions, pH and alkalinity. The analytical results will be provided 

to the COGCC and the surface owner. 

12. If production casing is run, then all hydrocarbon and water bearing 

formations must be covered with cement and a cement bond log must be 

run to verify coverage. Cementing requirements will be determined by 

COGCC staff from open-hole logs and other well information obtained 

during the drilling of the well. 

13. If the well is plugged as a dry hole, then the COGCC must be contacted 

for plugging instructions, which will be based on log and geologic data, 

and the actual wellbore configuration. Cement plugs will be set to confine 

all fluids to the reservoirs in which they originally occurred. The plugging 

procedure will assure that all aquifers are properly isolated and protected. 

14. A guard, provided by Lexam, shall be stationed at the property gate on 

County Road T during all drilling and completion activities. The guard will 

limit access to the property to Lexam employees, Lexam contractors, and 

other authorized personnel. 

15. Baseline water quality data will be acquired from both near surface 

(unconfined aquifer) and deeper aquifers in proximity to proposed wells 

prior to the spud of the wells and again within six months after the wells 

are completed and/or plugged. Sampling and analysis procedures must 

be approved by the COGCC staff prior to conducting this work. Data will 

be provided to the COGCC and the surface owner. Data will used to 

assess any possible long-term affects on ground water quality. 

- 2 -
16. A minimum of one up-gradient and two down-gradient monitoring wells will 

be installed around each drill pad. The wells will be completed in the 

shallow unconfined aquifer. The locations and elevations of the wells will 

be surveyed and depth to water will be measured. Water samples will be 

collected for chemical analysis before the wells are spud and at 

predetermined intervals thereafter, which will agreed to by the United 

States Fish and Wildlife Service (USFWS) and Lexam. If spills or releases 

of drilling related chemicals at sites occur, then the sampling frequency 

may be increased to a frequency agreed to by the USFWS, Baca Grande 

Water and Sanitation District, and Lexam. 

17. Equipment and vehicles brought onto the Baca National Wildlife Refuge 

from outside the San Luis Valley must be cleaned and decontaminated to 

minimize introduction of non-native species and noxious weeds. 

18. Lexam will insure that all drilling and completion operations will be 

supervised by a WellCAP IADC certified supervisor. All blow prevention 

equipment shall be rated for 5000 psi and will be installed and tested in 

accordance with U.S. Bureau of Land Management Onshore Order #1. 

- 3 -
Appendix D 

Agreement Between Saguache County and Lexam Explorations 

(U.S.A.) 

 January 2008 Lexam EA
Appendix E 

Baseline Surface Water and Groundwater Sampling Analytical 

Results 

 January 2008 Lexam EA
Baseline Chemistry for Ground Water 

Sample Name 199723 375307 C-18 C-20 C-22 C-23 C-24 C-25 C-27 C-57 C-7 FL-3 FL-4 MOTEL WELL DOMESTIC WELL SW-5 From Pump SW-5 From Bailer WELL 14 

Location Type Flowing Well Pumped Well Flowing Well Flowing Well Flowing Well Flowing Well Flowing Well Flowing Well Flowing Well Flowing Well Flowing Well Flowing Well Flowing Well Pumped Well Pumped Well Pumped Well Pumped Well Pumped Well 

Aquifer Confined Confined Confined Confined Confined Confined Confined Confined Confined Confined Confined Confined Confined Unconfined Unconfined Unconfined Unconfined Unconfined 

Treatment (a) (a) (a) (a) (a) (a) (a) (a) (a) (a) (a) (a) (a) (a) (a) (a) (a) (a) 

Profile I (Major ions, metals, general) pH (std. units) 8.53 8.35 8.45 8.15 8.3 8.38 8.38 8.39 8.29 8.17 8.31 8.48 8.01 7.36 7.64 (f) 7.47 7.44 

pH - Field (s.u.) 8.6 8.21 8.67 8.06 8.60 8.54 8.30 8.5 8.22 8.32 8.65 8.45 8.07 7.83 8.15 8.28 8.25 7.45 

Conductivity - Field 148.1 1147 366 832 313 145.5 741 1602 2410 126.6 174.2 1130 395 65.7 140.3 111.9 113.5 136.5 

Temperature - Field 31.3 25.1 (e) 14 (e) 18.4 16.7 (e) (e) 16.2 (e) 18.8 18.0 13.4 (e) 14.2 12.1 10.6 

Alkalinity (mg/L as CaCO3) 434 661 210 298 136 166 384 813 1410 138 85.4 628 153 62.9 72.5 (f) 56.3 67.9 

Bicarbonate (mg/L as CaCO3) 416 654 202 298 134 161 377 800 1410 138 83 610 153 62.9 72.5 (f) 56.3 67.9 

Carbonate (mg/L as CaCO3) 18 7 8 <1 2.1 5 7.2 12.8 5.3 <1 2.5 17.9 <1 <1 <1 (f) <1 <1 

Chloride 10.3 7.87 2.74 3.1 2.02 2.05 4.77 9.08 19.3 1.92 2.1 4.85 9.07 1.17 1.02 (f) 0.97 0.36 

Fluoride 7.78 3.39 1.73 1.68 2.19 2.54 2.74 3.71 3.3 2.02 0.68 3.18 2.18 <0.1 0.17 (f) <0.1 0.1 

Sulfate 0.72 0.46 0.49 0.68 <0.3 0.53 <0.3 0.32 <0.3 0.43 0.91 0.95 <0.3 3.53 1.82 (f) 1.75 3.57 

Total Dissolved Solids 548 777 251 335 171 181 423 929 1560 182 133 722 228 85 103 (f) 90 94 

Aluminum (mg/L) <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08 (f) <0.08 <0.08 

Antimony (mg/L) <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 (f) <0.003 <0.003 

Arsenic (mg/L) <0.025 <0.025 <0.025 <0.025 <0.025 <0.025 <0.025 <0.025 <0.025 <0.025 <0.025 <0.025 <0.025 <0.025 <0.025 (f) <0.025 <0.025 

Barium (mg/L) 0.0122 0.0376 0.0223 0.0498 0.0319 0.0266 0.0283 0.0299 0.0619 0.0453 0.0315 0.0283 0.0783 0.0423 0.022 (f) 0.0347 0.0379 

Beryllium (mg/L) <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 (f) <0.002 <0.002 

Boron (mg/L) 1.67 0.85 0.15 0.26 0.13 0.19 0.36 0.99 1.49 0.12 <0.04 0.93 0.13 <0.04 <0.04 (f) <0.04 <0.04 

Cadmium (mg/L) <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 (f) <0.002 <0.002 

Calcium (mg/L) 2.71 5.24 4.27 8.41 7.44 7.05 4.11 3.04 3.82 9.29 10.2 2.99 24.8 17.4 16.2 (f) 13.1 19.8 

Chromium (mg/L) <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 (f) <0.006 <0.006 

Copper (mg/L) <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 (f) <0.01 <0.01 

Iron (mg/L) <0.06 <0.06 <0.06 0.11 <0.06 <0.06 <0.06 <0.06 <0.06 <0.06 <0.06 0.08 0.07 <0.06 <0.06 (f) <0.06 <0.06 

Lead (mg/L) <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 (f) <0.003 <0.003 

Magnesium (mg/L) 0.61 2.3 0.91 2.77 1.03 1.32 1.47 1.88 5.19 1.68 0.7 1.84 3.94 3.59 2.41 (f) 3.83 3.25 

Manganese (mg/L) 0.006 0.038 0.017 0.074 0.018 0.015 0.027 0.026 0.034 0.033 0.012 0.011 0.044 <0.004 0.005 (f) 0.024 <0.004 

Mercury (mg/L) <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 (f) <0.0002 <0.0002 

Nickel (mg/L) <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 (f) <0.01 <0.01 

Potassium (mg/L) 4.16 8.39 5.14 7.68 6.86 5.71 6.01 8.64 13 7.16 5.47 5.61 4.5 1.13 3.36 (f) 2.17 1.15 

Selenium (mg/L) 0.0092 <0.003 0.0043 0.0082 0.0043 <0.003 <0.003 0.006 0.0042 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 (f) <0.003 <0.003 

Silver (mg/L) <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 (f) <0.005 <0.005 Sodium (mg/L) 188 297 77.4 109 44.6 53.7 149 339 485 46.9 20.1 279 40.8 4.81 8.02 (f) 4.71 4.45 

Thallium (mg/L) <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 (f) <0.002 <0.002 

Zinc (mg/L) <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 0.088 (f) 0.046 <0.01 

Hydrocarbons Diesel (mg/L) <0.1 <0.1 <0.1 (c) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 

Gasoline (mg/L) <0.1 <0.1 <0.1 (c) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 

Ethane (mg/L) 0.0186 0.0157 0.00304 (c) 0.00199 0.00231 0.00472 0.0179 0.0104 0.00165 <0.001 0.013 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 

Methane (mg/L) 11.7 25.8 18.1 (c) 7.23 9.33 25.7 22.1 15.8 9.12 0.792 23.7 0.929 0.00109 0.00354 <0.001 0.0172 <0.001 

VOCs 1,1,1,2-Tetrachloroethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,1,1-Trichloroethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,1,2,2-Tetrachloroethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,1,2-Trichloroethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,1-Dichloroethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,1-Dichloroethene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,1-dichloropropene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2,3-Trichlorobenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2,3-Trichloropropane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2,4-Trichlorobenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2,4-Trimethylbenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2-Dibromo-3-chloropropane(DBCP) (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2-Dibromoethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2-Dichlorobenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2-Dichloroethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2-Dichloropropane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,3,5-Trimethylbenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,3-Dichlorobenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,3-Dichloropropane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,4-Dichlorobenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,2-Dichloropropane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2-Chlorotoluene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2-hexanone (μg/L) <2.5 <2.5 <2.5 (c) <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 

4-Chlorotoluene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Acetone (μg/L) <2.5 <2.5 <2.5 (c) <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 

Acrylonitrile (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Benzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Bromobenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Bromochloromethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Bromodichloromethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 
Bromoform (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Bromomethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Carbon disulfide (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Carbon Tetrachloride (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Chlorobenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Chloroethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Chloroform (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Chloromethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

cis-1,2-dichloroethene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

cis-1,3-Dichloropropene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Dibromochloromethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Dibromomethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Dichlorodifluoromethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Ethylbenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Hexachlorobutadiene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Isopropylbenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

m+p-Xylene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Methyl ethyl ketone (μg/L) <2.5 <2.5 <2.5 (c) <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 

Methyl isobutyl ketone (μg/L) <2.5 <2.5 <2.5 (c) <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 

Methylene chloride (μg/L) <2.5 <2.5 <2.5 (c) <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 

methyl-t-butyl ether (MTBE) (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Naphthalene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

n-Butylbenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

n-Propylbenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

o-Xylene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

p-isopropyltoluene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

s-Butylbenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Styrene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

t-Butylbenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Tetrachloroethene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Toluene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

trans-1,2-Dichloroethene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

trans-1,3-Dichloropropene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Trichloroethene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

trichlorofluoromethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Vinyl Chloride (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

SVOCs 1,2,4-Trichlorobenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2-Dichlorobenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2-Diphenyl hydrazine (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,3-Dichlorobenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,4-Dichlorobenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1-Methylnaphthalene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,3,4,6-Tetrachlorophenol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,3,5,6-Tetrachlorophenol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,4,5-Trichlorophenol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,4,6-Trichlorophenol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,4-Dichlorophenol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,4-Dimethylphenol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,4-Dinitrophenol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,4-Dinitrotoluene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,6-Dinitrotoluene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2-Chloronaphthalene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2-Chlorophenol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2-Methylnaphthalene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2-Methylphenol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2-Nitroaniline (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2-Nitrophenol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

3,3'-Dichlorobenzidine (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

3+4-Methylphenol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

3-Nitroaniline (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

4,6-Dinitro-2-methylphenol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

4-Bromophenyl-phenylether (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

4-Chloro-3-methylphenol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

4-Chloroaniline (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

4-Chlorophenyl-phenylether (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

4-Nitroaniline (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

4-Nitrophenol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Acenaphthene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Acenaphthylene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Aniline (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Anthracene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Benzidine (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Benzo(ghi)perylene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Benzo[a]anthracene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Benzo[a]pyrene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Benzo[b]fluoranthene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Benzo[k]fluoranthene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Benzyl alcohol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 
bis(2-Chloroethoxy)methane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

bis(2-Chloroethyl)ether (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

bis(2-chloroisopropyl)ether (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

bis(2-Ethylhexyl)phthalate (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 1.21 <0.5 0.692 <0.5 <0.5 <0.5 <0.5 <0.5 3.09 0.551 

Butylbenzylphthalate (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Carbazole (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Chrysene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Dibenz[a,h]anthracene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Dibenzofuran (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Diethylphthalate (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Dimethylphthalate (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Di-n-butylphthalate (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Di-n-octylphthalate (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Fluoranthene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Fluorene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Hexachlorobenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Hexachlorobutadiene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Hexachlorocyclopentadiene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Hexachloroethane (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Indeno[1,2,3-cd]pyrene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Isophorone (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Naphthalene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Nitrobenzene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Nitrosodimethylamine (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

n-Nitroso-di-n-propylamine (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

n-Nitrosodiphenylamine (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Pentachlorophenol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Phenanthrene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Phenol (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Pyrene (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Pyridine (μg/L) <0.5 <0.5 <0.5 (c) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

 Organic compound or gas above detection limit (a) Unfiltered except for metals and major ions (c) Not accessible June 2007  Analyzed as part of December 2006 sampling event (b) Sample bottle drained during shipment; no analysis performed (e) Due to lag time, measured temperature not reflective of in situ water temperature 
Baseline Chemistry for Surface Water 

Sample Name COTTONWOOD CREEK INTAKE DEADMAN CREEK SOUTH CRESTONE CREEK SPANISH CREEK - EAST SPANSIH CREEK - WEST WILLOW CREEK - EAST WILLOW CREEK - BACA 5 WILLOW 

WE

Location Type Surface Water Surface Water Surface Water Surface Water Surface Water Surface Water Surface Water Sur

W

Aquifer n/a n/a n/a n/a n/a n/a n/a n

Treatment unfiltered filtered unfiltered filtered unfiltered filtered unfiltered filtered unfiltered filtered unfiltered filtered unfiltered filtered unfiltered 

Profile I (Major ions, metals, general) pH (std. units) 6.7 6.56 7.28 7.62 7.82 7.5 8.23 8.3 

pH - Field (s.u.) 7.86 8.02 7.89 7.53 (d) 7.97 8.54 (d) Conductivity - Field 49.9 47.7 55.8 178.9 (d) 86.7 353 (d) 

Temperature - Field (e) 12.9 10.4 16.3 (d) 14.9 (e) (d) Alkalinity (mg/L as CaCO3) 32.3 15.9 25.8 94 145 44.8 155 132 Bicarbonate (mg/L as CaCO3) 32.3 15.9 25.8 94 145 44.8 155 131 Carbonate (mg/L as CaCO3) <1 <1 <1 <1 <1 <1 <1 1.4 

Chloride 0.41 0.51 0.95 1 2.9 0.46 2.02 1.66 

Fluoride 0.12 0.4 0.1 0.22 0.31 0.15 0.38 0.3 

Sulfate 4.67 3.13 1.62 3.71 5.17 2.23 4.8 3.18 

Total Dissolved Solids 39 50 46 129 214 70 212 168 

Aluminum (mg/L) <0.08 <0.08 0.87 <0.08 0.17 <0.08 <0.08 <0.08 <0.08 <0.08 0.55 <0.08 0.1 <0.08 <0.08 

Antimony (mg/L) <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 

Arsenic (mg/L) <0.025 <0.025 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 

Barium (mg/L) 0.0073 0.0069 0.016 0.0068 0.023 0.0197 0.0412 0.0399 0.0503 0.0499 0.0372 0.0239 0.0459 0.0448 0.0357 

Beryllium (mg/L) <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 

Boron (mg/L) <0.04 <0.04 <0.04 <0.04 <0.04 <0.04 <0.04 <0.04 <0.04 <0.04 <0.04 <0.04 <0.04 <0.04 <0.04 

Cadmium (mg/L) <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 

Calcium (mg/L) 12 11.8 6.9 6.34 8.42 8.13 19.2 18.4 28.5 28 12.4 11.6 25.3 25 23.5 

Chromium (mg/L) <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 <0.006 

Copper (mg/L) <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 

Iron (mg/L) <0.06 <0.06 1.06 <0.06 0.23 <0.06 <0.06 <0.06 0.13 0.08 1.03 0.08 0.2 <0.06 <0.06 

Lead (mg/L) <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 

Magnesium (mg/L) 1.43 1.4 0.98 0.76 0.89 0.84 5.83 5.59 7.84 7.73 2.12 1.75 9.83 9.61 7.67 

Manganese (mg/L) 0.004 <0.004 0.0223 <0.004 0.0113 <0.004 <0.004 <0.004 0.0211 0.0116 0.0509 0.014 0.007 0.0068 <0.004 

Mercury (mg/L) <0.0002 <0.0002 0.00021 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 

Nickel (mg/L) <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 

Potassium (mg/L) <0.5 <0.5 0.77 0.59 <0.5 <0.5 2.31 2.24 6.08 6.04 1.63 1.49 4.34 4.25 4.15 

Selenium (mg/L) <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 <0.003 

Silver (mg/L) <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 

Sodium (mg/L) 1.64 1.61 1.1 1.06 0.98 0.96 10.7 10 17.9 17.4 1.98 1.91 24.2 23.6 16.1 

Thallium (mg/L) <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 

Zinc (mg/L) <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 

Hydrocarbons Diesel (mg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 

Gasoline (mg/L) <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.25 

Ethane (mg/L) <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 

Methane (mg/L) <0.001 <0.001 <0.001 0.0307 0.0349 0.00472 0.00621 0.00112 

VOCs 1,1,1,2-Tetrachloroethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,1,1-Trichloroethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,1,2,2-Tetrachloroethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,1,2-Trichloroethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,1-Dichloroethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,1-Dichloroethene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,1-dichloropropene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2,3-Trichlorobenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2,3-Trichloropropane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2,4-Trichlorobenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2,4-Trimethylbenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2-Dibromo-3-chloropropane(DBCP) (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2-Dibromoethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2-Dichlorobenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2-Dichloroethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2-Dichloropropane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,3,5-Trimethylbenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,3-Dichlorobenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,3-Dichloropropane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,4-Dichlorobenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,2-Dichloropropane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2-Chlorotoluene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2-hexanone (μg/L) <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 

4-Chlorotoluene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Acetone (μg/L) <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 

Acrylonitrile (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Benzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Bromobenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Bromochloromethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Bromodichloromethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 
Bromoform (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Bromomethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Carbon disulfide (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Carbon Tetrachloride (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Chlorobenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Chloroethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Chloroform (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Chloromethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

cis-1,2-dichloroethene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

cis-1,3-Dichloropropene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Dibromochloromethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Dibromomethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Dichlorodifluoromethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Ethylbenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Hexachlorobutadiene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Isopropylbenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

m+p-Xylene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Methyl ethyl ketone (μg/L) <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 

Methyl isobutyl ketone (μg/L) <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 

Methylene chloride (μg/L) <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 

methyl-t-butyl ether (MTBE) (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Naphthalene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

n-Butylbenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

n-Propylbenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

o-Xylene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

p-isopropyltoluene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

s-Butylbenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Styrene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

t-Butylbenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Tetrachloroethene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Toluene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

trans-1,2-Dichloroethene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

trans-1,3-Dichloropropene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Trichloroethene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

trichlorofluoromethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Vinyl Chloride (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

SVOCs 1,2,4-Trichlorobenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2-Dichlorobenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,2-Diphenyl hydrazine (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,3-Dichlorobenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1,4-Dichlorobenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

1-Methylnaphthalene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,3,4,6-Tetrachlorophenol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,3,5,6-Tetrachlorophenol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,4,5-Trichlorophenol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,4,6-Trichlorophenol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,4-Dichlorophenol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,4-Dimethylphenol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,4-Dinitrophenol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,4-Dinitrotoluene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2,6-Dinitrotoluene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2-Chloronaphthalene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2-Chlorophenol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2-Methylnaphthalene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2-Methylphenol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2-Nitroaniline (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

2-Nitrophenol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

3,3'-Dichlorobenzidine (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

3+4-Methylphenol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

3-Nitroaniline (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

4,6-Dinitro-2-methylphenol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

4-Bromophenyl-phenylether (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

4-Chloro-3-methylphenol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

4-Chloroaniline (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

4-Chlorophenyl-phenylether (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

4-Nitroaniline (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

4-Nitrophenol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Acenaphthene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Acenaphthylene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Aniline (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Anthracene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Benzidine (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Benzo(ghi)perylene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Benzo[a]anthracene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Benzo[a]pyrene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Benzo[b]fluoranthene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Benzo[k]fluoranthene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Benzyl alcohol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 
bis(2-Chloroethoxy)methane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

bis(2-Chloroethyl)ether (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

bis(2-chloroisopropyl)ether (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

bis(2-Ethylhexyl)phthalate (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 3.33 0.583 Butylbenzylphthalate (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Carbazole (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Chrysene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Dibenz[a,h]anthracene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Dibenzofuran (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Diethylphthalate (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Dimethylphthalate (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Di-n-butylphthalate (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Di-n-octylphthalate (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Fluoranthene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Fluorene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Hexachlorobenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Hexachlorobutadiene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Hexachlorocyclopentadiene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Hexachloroethane (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Indeno[1,2,3-cd]pyrene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Isophorone (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Naphthalene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Nitrobenzene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Nitrosodimethylamine (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

n-Nitroso-di-n-propylamine (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

n-Nitrosodiphenylamine (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Pentachlorophenol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Phenanthrene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Phenol (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Pyrene (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 

Pyridine (μg/L) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5

 Organic compound or gas above detection limit (d) Field parameters not measured Analyzed as part of December 2006 sampling event (e) Due to lag time, measured temperature not reflective of in situ water temperature