Page 62 - Bridge and Highway Structure Rehabilitation and Repair

CHAPTER 1 OVERVIEW OF BRIDGE ENGINEERING 37

• EA (environmental assessment): An EA is required when the significance of the environ-

mental impact is not clearly established.
• EIS (environmental impact statement): EIS documents need to be prepared when a replace-
ment or new bridge (usually with four or more lanes) has signifi cant impact on natural,
ecological, or cultural resources including on endangered species, wetlands, fl ood plains,

groundwater, fauna, and flora. An EIS is required when there are impacts on properties
protected by the DOT Act or the Historic Preservation Act. Significant impacts on noise

and air quality need to be avoided.

• CE (categorical exclusions): An action that does not have a significant effect on the environ-
ment falls under CE. Examples provided by FHWA are reconstruction or modifi cation of
two-lane bridges, adding pedestrian or bicycle lanes, widening for shoulders, installation
of signs, etc.

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Lushko, Brian, “Accelerated Bridge Construction,” Structure Magazine, August 2007.
Precast Slab System Workshop Summary Report, Minnesota Department of Transportation and Federal
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Ralls, Mary Lou, Ronald Medlock and Sharon Slagle, “Prefabricated Bridge National Implementation
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Aesthetic Bridges
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