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Center for Environmental Excellence | AASHTO
Center for Environmental Excellence | AASHTO
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  • Laws & Agreements
    • Programmatic Agreements Library (PAL)
    • Case Law Updates on the Environment (CLUE)
    • National Environmental Policy Act (NEPA)
    • NEPA Assignment
  • State of the Practice
    • Case Studies
    • Communities of Practice
    • Practitioner Interviews
  • Education
    • Environmental Topics
      • Active Transportation
      • Air Quality
      • Climate Change
      • Environmental Justice
      • Invasive Species/Vegetation
      • Stormwater
      • Sustainability
      • Traffic Noise
      • Waste Management/Recycling
      • Water Quality/Wetlands
      • Wildlife and Ecosystems
    • Practical Applications
      • Context Sensitive Solutions
      • Emerging Technologies
      • Environmental Management Systems
      • Geographic Information Systems
      • NEPA Process
      • Planning & Environment Linkages
      • Project Delivery
      • Protecting Cultural Resources
      • Public Involvement
      • Transportation Policy
      • Using the Practitioner’s Handbooks
  • News
  • Meetings & Events
    • Past Events
  • Resources
    • Practitioner’s Handbooks
    • AASHTO Publications
    • AASHTO Standing Committees
    • Federal & State Agencies
    • Trade Associations
    • Research
      • NCHRP 25-25
      • TERI Database
      • TRB Committees

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National Synthesis of Highway Noise Effects on Historic Properties and Effective Mitigation Practices

By ahardingMay 7, 2021Leave a comment

Section 106 of the National Historic Preservation Act of 1966 (54 USC §306108) requires that Federal agencies take into account the effects of their undertakings on properties eligible for listing…

Hazardous materials remediation with historic bridge rehabilitation and donation

By ahardingMay 7, 2021Leave a comment

Under 23 USC 144, any State that proposes to demolish a historic bridge for a replacement project…shall first make the historic bridge available for donation. Truss bridges are logical choices…

Zerovalent iron and/or biochar amendments to stormwater BMPs to enhance roadway runoff treatment efficiency.

By ahardingMay 7, 2021Leave a comment

The transportation sector is often identified as a major source of nutrients (nitrogen and phosphorus) to receiving waters. Stormwater runoff from highways and roadways carries many pollutants such as sediment,…

Sensitivity through the Modeling Chain for Project Level Air Quality Analyses

By ahardingMay 7, 2021Leave a comment

This research will provide information on the sensitivity of ambient air quality to project-level traffic and other key inputs in the traffic, emission and dispersion modeling chain including meteorological inputs.…

Best Practices for Section 106 and Environmental Commitments in Public/Private Partnerships and Design-Build Contracts

By ahardingMay 7, 2021Leave a comment

BACKGROUND: Public-private partnerships (P3s) are contractual agreements formed between a public agency and a private sector entity that allow for greater private sector participation in the delivery and financing of…

Performance Analyses of Transportation Liaisons in State Historic Preservation Offices

By ahardingMay 7, 2021Leave a comment

BACKGROUND: Beginning in in the early 1990s, some State Department of Transportations (State DOTs) began to fund additional staff positions at resource agencies to expedite project delivery. After the passage…

A National Perspective on Evaluating Strategies for Historic Truss Bridge Projects between Rehabilitation and Removal/Mitigation

By ahardingMay 7, 2021Leave a comment

Description: It is generally recognized that not all historic truss bridges can be rehabilitated in place or relocated because of structural condition, financial costs, or public interest in preservation in-place.…

National Synthesis of Railing Systems Successfully Used for the Rehabilitation of Historic Bridges and for New Bridges in Historic Areas

By ahardingMay 7, 2021Leave a comment

The rehabilitation of historic bridges often must accommodate upgrading certain components to modern engineering and safety standards. Railing systems are among the most visually prominent of such components, either through…

Updating regional road networks in forested regions for environmental assessment

By ahardingMay 7, 2021Leave a comment

Road features have both positive and negative effects on their surroundings. While roads provide transportation for people and goods, there are a significant number of negative ecological impacts that can…

Fleet and Activity Data with Improved Spatio-Temporal Details for Emissions and Air Quality Modeling

By ahardingMay 7, 2021Leave a comment

Summary Objective: The objective of this research is to provide guidelines and best practices for practitioners for developing spatial and temporally detailed vehicle fleet and activity estimates for input to…

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  • All Content

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The Center for Environmental Excellence by the American Association of State Highway and Transportation Officials (AASHTO) has been developed in cooperation with the Federal Highway Administration to promote environmental stewardship and to encourage innovative ways to streamline the transportation delivery process.

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