STATE PROJECT NUMBER: 0066-96A-417, P101, R201, C501; UPC: 108424 | FEDERAL PROJECT NUMBER: NHPP-066-1(356) FAIRFAX AND ARLINGTON COUNTIES, VIRGINIA TRANSFORM I-66: INSIDE THE BELTWAY Eastbound Widening Revised Environmental Assessment MARCH 2017 U.S. DEPARTMENT OF TRANSPORTATION FEDERAL HIGHWAY ADMINISTRATION and VIRGINIA DEPARTMENT OF TRANSPORTATION REVISED ENVIRONMENTAL ASSESSMENT Transform Interstate 66: Inside the Capital Beltway, Eastbound Widening Fairfax and Arlington Counties, Virginia State Project Number: 0066-96A-417, P101, R201, C501; UPC: 108424 Federal Project Number: NHPP-066-1(356) From: Exit 67 Dulles Airport Access Road (Route 267) To: Exit 71 Fairfax Drive (Route 237) Submitted Pursuant to 42 U.S.C. 4332(2) (C) TABLE OF CONTENTS Chapter 1.0 PURPOSE AND NEED ................................................................................................... 1-1 1.1 STUDY AREA .......................................................................................................................... 1-1 1.2 HISTORY OF I-66 ................................................................................................................... 1-3 1.3 PROJECT BACKGROUND ................................................................................................... 1-3 1.4 NEEDS FOR THE PROJECT ................................................................................................ 1-5 1.4.1 Reduce Congestion and Improve Traffic Operations ......................................................... 1-6 1.4.2 Address Safety ................................................................................................................. 1-14 1.5 PROJECT PURPOSE ........................................................................................................... 1-15 Chapter 2.0 ALTERNATIVES .......................................................................................................... 2-16 2.1 ALTERNATIVES DEVELOPMENT .................................................................................. 2-16 2.2 ALTERNATIVES CARRIED FORWARD FOR DETAILED STUDY ........................... 2-16 2.2.1 No Build Alternative ........................................................................................................ 2-16 2.2.2 Build Alternative .............................................................................................................. 2-17 2.2.3 Environmental Study Area and Limits of Disturbance .................................................... 2-25 2.3 ABILITY OF ALTERNATIVES TO MEET PURPOSE AND NEED ............................. 2-26 2.3.1 Increase Capacity ............................................................................................................. 2-26 2.3.2 Reduce Congestion and Improve Traffic Operations ....................................................... 2-28 2.3.3 Address Safety ................................................................................................................. 2-28 Chapter 3.0 ENVIRONMENTAL CONSEQUENCES ................................................................... 3-31 3.1 INTRODUCTION AND OVERVIEW OF ENVIRONMENTAL ISSUES ...................... 3-31 3.2 LAND USE AND PROPERTY IMPACTS.......................................................................... 3-36 3.2.1 No Build Alternative ........................................................................................................ 3-36 3.2.2 Build Alternative .............................................................................................................. 3-36 3.3 COMMUNITIES AND COMMUNITY FACILITIES ....................................................... 3-37 Revised Environmental Assessment March 2017 i Table of Contents 3.3.1 Communities .................................................................................................................... 3-37 3.3.2 Community Facilities, including Parks and Bicycle/Pedestrian Facilities ....................... 3-37 3.3.3 No Build Alternative ........................................................................................................ 3-43 3.3.4 Build Alternative .............................................................................................................. 3-43 3.4 DEMOGRAPHICS AND HOUSING CHARACTERISTICS ........................................... 3-44 3.4.1 Population ........................................................................................................................ 3-45 3.4.2 Housing ............................................................................................................................ 3-47 3.4.3 No Build Alternative ........................................................................................................ 3-48 3.4.4 Build Alternative .............................................................................................................. 3-48 3.5 ECONOMICS ........................................................................................................................ 3-48 3.5.1 No Build Alternative ........................................................................................................ 3-49 3.5.2 Build Alternative .............................................................................................................. 3-49 3.6 ENVIRONMENTAL JUSTICE ........................................................................................... 3-49 3.6.1 Minority Populations........................................................................................................ 3-50 3.6.2 Low-Income ..................................................................................................................... 3-51 3.6.3 No Build Alternative ........................................................................................................ 3-51 3.6.4 Build Alternative .............................................................................................................. 3-51 3.7 CULTURAL RESOURCES .................................................................................................. 3-51 3.7.1 Archaeological Resources ................................................................................................ 3-52 3.7.2 Architectural Resources ................................................................................................... 3-52 3.7.3 No Build Alternative ........................................................................................................ 3-53 3.7.4 Build Alternative .............................................................................................................. 3-53 3.8 SECTION 4(F) ....................................................................................................................... 3-53 3.8.1 No Build Alternative ........................................................................................................ 3-54 3.8.2 Build Alternative .............................................................................................................. 3-54 3.9 AIR QUALITY ....................................................................................................................... 3-55 March 2017 Revised Environmental Assessment ii Table of Contents 3.9.1 No Build Alternative ........................................................................................................ 3-56 3.9.2 Build Alternative .............................................................................................................. 3-57 3.10 NOISE ..................................................................................................................................... 3-59 3.10.1 No Build Alternative ........................................................................................................ 3-60 3.10.2 Build Alternative .............................................................................................................. 3-60 3.11 STREAMS AND WETLANDS ............................................................................................. 3-61 3.11.1 No Build Alternative ........................................................................................................ 3-62 3.11.2 Build Alternative .............................................................................................................. 3-62 3.12 WATER QUALITY ............................................................................................................... 3-66 3.12.1 No Build Alternative ........................................................................................................ 3-67 3.12.2 Build Alternative .............................................................................................................. 3-67 3.13 FLOODPLAINS ..................................................................................................................... 3-68 3.13.1 No Build Alternative ........................................................................................................ 3-69 3.13.2 Build Alternative .............................................................................................................. 3-69 3.14 WILDLIFE AND HABITAT ................................................................................................ 3-70 3.14.1 No Build Alternative ........................................................................................................ 3-70 3.14.2 Build Alternative .............................................................................................................