495 Northern Extension HomeProject ResourcesDocuments and Studies

Documents and Studies

NOISE REPORTS
Final Noise Abatement Design Report Technical Memorandum for Noise Barrier C (October 2023) - PDF, 3.04 MB
Final Noise Abatement Design Report Technical Memorandum for Noise Barriers 13D and 13E (June 2023) - PDF, 8.14 MB
Final Noise Abatement Design Report (April 2023) - PDF, 27.8 MB
Preliminary Noise Analysis Tech Report (February 2020) - PDF, 2.6 MB
Preliminary Noise Analysis Tech Report Appendices (February 2020) - PDF, 52.4 MB

 

ENVIRONMENTAL STUDIES & APPROVALS
FHWA Finding of No Significant Impact (June 2021) - PDF, 420 KB
FHWA FONSI Appendix A (June 2021) - PDF, 525 KB
Revised Environmental Assessment (May 2021) - PDF, 172 MB
NPS Section 4(f) Temporary Occupancy and De Minimis Impact Determination Concurrence (May 2021) - PDF, 3 MB
Fairfax County Park Authority Section 4(f) Temporary Occupancy and De Minimis Impact Determination Concurrence (May 2021) - PDF, 3 MB
Technical Memorandum Errata Sheet (May 2021) - PDF, 150 KB
National Park Service (NPS) Section 106 No Adverse Effect Concurrence (April 2020) - PDF, 160 KB
Environmental Assessment (February 2020) - PDF, 60 MB
Air Quality Tech Report (February 2020) - PDF, 9.7 MB
Air Quality Tech Report Appendices (February 2020) - PDF, 5.9 MB
Alternatives Development Technical MemoAlternatives Development Technical Memo (February 2020) - PDF, 14.6 MB
George Washington Memorial Parkway Visualization Booklet (February 2020) - PDF, 84.1MB
Hazardous Materials Tech Memo (February 2020) - PDF, 1.7 MB
Hazardous Materials Tech Memo Appendices (February 2020) - PDF, 2.9 MB
Indirect & Cumulative Effects Tech Report (February 2020) - PDF, 6.2 MB
Natural Resources Tech Report (February 2020) - PDF, 11.8 MB
Natural Resources Tech Report Appendices (February 2020) - PDF, 40.7 MB
Section 4(f) & Section 6(f) Technical Memo (February 2020) - PDF, 11.5 MB
Socioeconomic and Land Use Tech ReportSocioeconomic and Land Use Tech Report (February 2020) - PDF, 5.7 MB
Cultural Resources Survey Tech Report (June 2019) - PDF, 12 MB
Virginia Department of Environmental Quality Approval for Virginia Stormwater Management Program regulations (January 2019) - PDF, 700 KB

 

TRAFFIC & TECHNICAL REPORTS
Traffic & Transportation Technical Report Errata #3 (January 3, 2022) - PDF, 180 KB
Final Approved IJR Addendum with Signatures (December 2021) - PDF, 8.61 MB
Final IJR Addendum Appendices (December 2021) - PDF, 68 MB
Final Approved IJR with Signatures (June 2021) - PDF, 86 MB
Final Approved IJR Appendices (June 2021) - PDF, 284 MB
Traffic & Transportation Technical Report Errata #2 (June 1, 2020) - PDF, 267 KB
Traffic & Transportation Technical Report Errata (May 7, 2020) - PDF, 198 KB
Traffic & Transportation Technical Report and Appendices (February 2020) - PDF, 123 MB

 

TRANSPORTATION MANAGEMENT PLAN (TMP)
Final Approved Transportation Management Plan (April 2022) - PDF, 3.5 MB

 

COMMONWEALTH TRANSPORTATION BOARD APPROVAL
Commonwealth Transportation Board HOT Lanes Designation (April 2021) - PDF, 150 KB

 

I-495 AMERICAN LEGION BRIDGE TRANSIT/TDM PLAN
I-495 American Legion Bridge Transit /TDM Plan Final Report (March 2021) - PDF, 29.5 MB

 

495 NEXT REVEGETATION CONCEPTUAL PLAN

495 NEXT Revegetation Conceptual Plan Boards (April 2024, Presented at April 8 & 11, 2024 Project Update Meetings) - PDF, 13.8 MB

495 NEXT Corridor Revegetation Conceptual Plan (April 2024, Presented at April 8 & 11, 2024 Project Update Meetings) - PDF, 3.5 MB

 

Last updated: April 16, 2024

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