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Center for Environmental Excellence | AASHTO
Center for Environmental Excellence | AASHTO
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    • NEPA Assignment
  • State of the Practice
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Water Quality/Wetlands

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Development of a Standardized Testing Protocol for the Approval of Field-cured Products for Use on Highway Maintenance and Construction Projects

By Amber GarnettJune 13, 2022

Background DOTs routinely receive requests to add new products and materials to their lists of approved products, including culvert repair products and materials used for road and bridge repair. Many…

Concrete Curing pH Level Impacts for Minimization of Harm to Aquatic Species

By ahardingJune 22, 2021

FY2022 NCHRP PROBLEM STATEMENT OUTLINE 1. Problem Title Concrete Curing pH Level Impacts for Minimization of Harm to Aquatic Species 2. Background Construction and maintenance actions regularly require state Department…

Stormwater Management to Address Highway Runoff Toxicity Associated with Tire Wear

By Amber GarnettJune 21, 2021

Recent research findings identified 6PPD-quinone as the major agent responsible for exceptionally high levels of rapid mortality of adult Coho salmon in some urban streams. Lethal effects occurred in Coho…

Impacts of Transportation Best Management Practices On Groundwater Quality

By ahardingMay 7, 2021Leave a comment

The ultimate fate of some treated transportation stormwater runoff from BMPs is groundwater. Groundwater is a precious resource. If groundwater quality has become degraded from transportation BMP stormwater runoff, the…

Alternative Methods Of Regulating Emissions And Discharges From Transportation Corridors

By ahardingMay 7, 2021Leave a comment

Those conducting the proposed research will 1. Identify opportunities for a change in regulatory system approach at the national, state, and local levels. 2. Develop a set of model regulations/ordinances,…

Hydraulic Modifications To Achieve Watershed Total Maximum Daily Loads

By ahardingMay 7, 2021Leave a comment

TERI Administrator Note (2007): Funded as NCHRP Project 25-31 Hydraulic Modifications to Existing Drainage Infrastructure in Ultra-Urban Areas to Achieve Watershed Total Maximum Daily Loads The transportation community is faced…

Expand Research On Transportation’s Cumulative Effects On Water Quality, Aquatic Ecosystems, and Fish In Various Bodies Of Water and On Ecologically Effective Solutions

By ahardingMay 7, 2021Leave a comment

Major and visible effects-such as shoreline alteration, reduced connection to adjacent upland, sediment filling-in, eutrophication, reduced oxygen levels, and altered fish populations-are attributable to roads altering coastal, lake, reservoir, pond,…

Which Highway Runoff BMPs Or Modifications Of Existing BMPs Are Most Suitable For Treating Phosphorus?

By ahardingMay 7, 2021Leave a comment

Algal blooms and excessive plant growth commonly plague lacustrine  systems due to the buildup of phosphorus.  While phosphorus is not a principal component in  highway runoff, there may be areas…

Conduct Further Research On Means Of Restoring Natural Hydrologic And Sediment Flows And Distributions In The Vicinity Of Roads.

By ahardingMay 7, 2021Leave a comment

Because hydrologic conditions around corridors are the result of transportation-system design processes, the major patterns of road hydrology are well documented. It is generally clear, for example, how highway hydrology…

Determine Dilution Factors for Snow and Ice Control Materials

By ahardingMay 7, 2021Leave a comment

Issue: Tests have shown that aquatic organisms have different tolerance thresholds to snow and ice control materials that are applied to roads, highways, and bridges. A major factor in terms of selecting…

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