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- AASHTO - American Association of State Highway and Transportation Officials
- ADA - Americans with Disabilities Act
- BDE - (IDOT) Bureau of Design and Environment
- BLRS - (IDOT District 1) Bureau of Local Roads and Streets
- BMP - Best Management Practices
- CAG - Community Advisory Group
- CE - Categorical Exclusion
- CEQ - Council on Environmental Quality
- CERCLIS - Comprehensive Environmental Response, Compensation, and Liability Information System
- CFR - Code of Federal Regulations
- CMAP - Chicago Metropolitan Agency for Planning
- CO - Carbon Monoxide or (IDOT) Central Office
- CSS - Context Sensitive Solutions
- DEIS - Draft Environmental Impact Statement
- DOI - (United States) Department of Interior
- EA – Environmental Assessment
- EIS – Environmental Impact Statement
- EPA - (United States) Environmental Protection Agency
- ESA - (Federal) Endangered Species Act
- FEMA - Federal Emergency Management Agency
- FHWA - Federal Highway Administration
- FIRM - Flood Insurance Rate Map
- FOIA - Freedom of Information Act
- FONSI – Finding of No Significant Impact
- FRA - Federal Railroad Administration
- FTA - Federal Transit Administration
- FWS - (United States) Fish and Wildlife Service
- ICC - Illinois Commerce Commission
- IDNR - Illinois Department of Natural Resources
- IDOA - Illinois Department of Agriculture
- IDOT - Illinois Department of Transportation
- IDS - Intersection Design Study
- IEPA - Illinois Environmental Protection Agency
- IHPA - Illinois Historic Preservation Agency
- INHS - Illinois Natural History Survey
- INPC - Illinois Nature Preserves Commission
- ISGS - Illinois State Geological Survey
- ISWS - Illinois State Water Survey
- LAWCON - Land and Water Conservation Fund (Act)
- LCDOT - Lake County Division of Transportation
- LCFPD - Lake County Forest Preserve District
- LOS - Level of Service
- LUST - Leaking Underground Storage Tank
- MCDOT - McHenry County Highway Department
- MPO - Metropolitan Planning Organization
- NAAQS - National Ambient Air Quality Standards
- NEPA - National Environmental Policy Act
- NFIP - National Flood Insurance Program
- NHPA - National Historic Preservation Act
- NHS - National Highway System
- NPDES - National Pollutant Discharge Elimination System
- NPS - National Park Service
- NRCS - Natural Resources Conservation Service
- NRHP - National Register of Historic Places
- OWR - Office of Water Resources (IDNR)
- PESA - Preliminary Environmental Site Assessment
- PSG - Project Study Group
- PSI - Preliminary Site Investigation
- RCRA - Resource Conservation and Recovery Act
- ROD - Record of Decision
- ROW - Right-of-Way
- SAFETEA-LU - Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users
- SHPO - State Historic Preservation Officer
- SIP - Stakeholder Involvement Plan
- SRA - (IDOT) Strategic Regional Arterial
- STP - Surface Transportation Program
- SWA - Special Waste Assessment
- TAG - Technical Advisory Group
- TCM - Transportation Control Measure
- TIP - Transportation Improvement Program
- TSM - Transportation System Management
- URAA - Uniform Relocation Assistance Act
- USACOE - United States Army Corps of Engineers
- USC - United States Code
- USDA - United States Department of Agriculture
- USDOT - United States Department of Transportation
- USEPA - United States Environmental Protection Agency
- USFWS - United States Fish and Wildlife Service
- USGS - United States Geological Survey
- UST - Underground Storage Tank