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SUPPLEMENTAL ENVIRONMENTAL ASSESSMENT JTF-6 FENCE AND ROAD CONSTRUCTION, DOUGLAS, COCHISE COUNrry, ARIZONA Prepared for: JOINT TASK FORCE SIX FORT BLISS, TEXAS Prepared by: U.S. ARMY CORPS OF ENGINEERS FT. WORTH DISTRICT Ft. Worth, Texas JULY 1997 EXECUTIVE SUMMARY This Environmental Assessment (EA) addresses the potential for significant adverse or beneficial environmental impacts in accordance with provisions of the National Environmental Policy Act (NEPA). This document was tiered from existing EAs completed for previous construction activities (U.S. Army 199la, 1993) in the same vicinity, and a Programmatic Environmental Impact Statement completed for Joint Task Force Six (JTF-6) activities along the U.S.-Mexico border (U.S. Army 1994). The Immigration and Naturalization Service (INS) and the U.S. Border Patrol, Tucson Sector are proposing to replace approximately six miles of fence, construct 0.5 miles of new road, and improve 0.8 miles of road along the U.S.-Mexico border at Douglas, Cochise County, Arizona. Approximately 1.3 miles would be of decorative fence, with the remaining 4.9 miles of steel landing mat. These agencies have requested support from JTF-6 for the use of military personnel and equipment to complete this action. JTF-6 has requested that the Fort Worth District, U.S. Army Corps of Engineers assess the potential for impacts related to construction of the fences. The proposed action would increase the U.S. Border Patrol's ability to complete their mission of reducing illegal drug traffic into the U.S. The proposed construction area encompasses approximately six miles of existing border fence near Douglas within a corridor that would be a maximum of 30 feet wide. The proposed action would be accomplished by a U.S. Military Engineer Battalion as part of their annual training. Approximately 70 personnel would be required to complete the proposed action. Alternatives considered include no action, increasing air patrols, increasing the number of U.S. Border Patrol agents in the area, and the proposed plan above. The no action alternative would not allow U.S. Border Patrol agents to increase effectiveness or fulfill their mission. Increasing air patrols would not. aid the U.S. Border Patrol in controlling drug traffic. Increasing the number of U.S. Border Patrol agents in the area was found to have excessive cost constraints, as well as an increase in expected environmental impacts. The pmposed action would not significantly impact area land use, water resources, air quality, cultural resources, or socioeconomic resources. Impacts of the proposed action would not affect any listed or species proposed for listing as threatened or endangered in accordance with the Endangered Species Act. Additionally, with environmental design measures specified as part of the proposed action, there would be negligible impacts to area soil, water resources, and biological resources. Significant potential soil erosion and related surface water runoff impacts would not be expected during construction efforts of the proposed action. Procedures and methods that would be implemented to mitigate erosion and sedimentation impacts have been developed in the Storm Water Pollution Prevention Plan (PPP) for the proposed action. A Notice of Intent as part of the PPP for the proposed action would be submitted to the Environmental Protection Agency and the Arizona Department of Environmental Quality prior to construction. TABLE OF CONTENTS EXECUTIVE SUMMARY ................................................................................... ii 1.0 INTRODUCTION .................................................................................. 1-1 1.1 Background............................. ... .1-1 . 1.2 Project Location .................................................................................... 1-1 1.3 Purposed and Need ................................................................................ 1-3 1.4 Applicable Environmental Statutes and Regulations ........................................ 1-4 2.0 DESCRIPTION OF PROPOSED ACTION AND ALTERNATIVES .................. 2-1 2.1 Proposed Action (Preferred Alternative) ...................................................... 2-1 2.2 No Action ........................................................................................... 2-5 2.3 Alternatives Considered but Eliminated from Detailed Analysis ............. -............ 2-5 2.3.1 Increase Air Patrols ...................................................................... 2-5 2.3.2 Increase Number of U.S. Border Patrol Agents ................................... 2-6 3.0 AFFECTED ENVIRONMENT ................................................................. 3-1 3.1 Land Use ............................................................................................ 3-1 3.2 Water Resources ................................................................................... 3-1 3.3 Air Quality .......................................................................................... 3-2 3.3 .1 Federal, State, Rural, and Wilderness Standards .................................. 3-2 3.3.2 Current Attainment Status .............................................................. 3-4 3.4 Biological Resources .............................................................................. 3-5 3.4.1 Vegetation ................................................................................. 3-5 3.4.2 Fish and Wildlife ......................................................................... 3-6 3.4.3 Threatened and Endangered Species ................................................. 3-6 . 3.5 Cultural Resources .................................................................................. 3-7 3.5.1 Previous Cultural Resource Investigations .......................................... 3-7 3.5.2 Known Cultural Resource Properties ................................................. 3-9 3.6 Socioeconomic Resources ....................................................................... 3-10 3.6.1 Population ................................................................................. 3-10 3.6.2 Employment and Income .............................................................. 3-10 4.0 ENVIRONMENTAL CONSEQUENCES .................................................... 4-1 4.1 Proposed Action ..................................................................................... 4-1 4.1.1 Land Use .................................................................................. 4-1 4 .1. 2 Water Resources ......................................................................... 4-1 4.1.3 Air Quality .................................. , ............................................. 4-2 4.1.4 Biological Resources .................................................................... 4-2 4.1.4.1 Vegetation ....................................................................... 4-2 4 .1.4. 2 Fish and Wildlife ............................................................... 4-4 4.1.4.3 Threatened and Endangered Species ....................................... 4-4 4.1.5 Cultural Resources ....................................................................... 4-5 4.1.6 Socioeconomic Resources .............................................................. 4-5 4.1.6.1 Environmental Justice ......................................................... 4-6 4.2 No Action ........................................................................................... 4-6 4.3 Cumulative Impacts ................................................................................ 4-7 iii 5.0 ENVIRONMENTAL DESIGN MEASURES ................................................ 5-l 5.1 General. .............................................................................................. 5-l 5.2 Water Resources ................................................................................... 5-1 5.3 Air Quality .......................................................................................... 5-1 5.4 Biological Resources .............................................................................. 5-2 5.5 Cultural Resources ................................................................................. 5-2 6.0 PUBLIC INVOLVEMENT., .................................................................... 6-1 6.1 Agency Coordination .............................................................................. 6-1 6.2 Public Review and Comment .................................................................... 6-1 7.0 REFERENCES ..................................................................................... 7-1 8.0 LIST OF ACRONYMS/ABBREVIATIONS ................................................. 8-l 9.0 LIST OF PREPARERS ............................................................................ 9-1 Appendix A Photographs of Proposed Construction Area Appendix B List of Species Listed and Proposed for Listing Under the Endangered Species Act Appendix C Cultural History and Previous Research in the Douglas Area Appendix D Storm Water Pollution Prevention Plan Appendix E Public Comments and Responses on Draft Environmental Assessment LIST OF TABLES Table 1-1 Applicable Environmental Statutes and Regulations ................................... 1-5 Table 3-1 National and State Ambient Air Quality Standards ...................................... 3-3 Table 3-2 Habitat Requirements and Reason for Decline of Federally Listed Species and Species Proposed for Listing ......................................