Extensive information about natural, cultural, and human resources was collected and analyzed as part of the preparation for the project's Environmental Assessment document which was released on December 9, 2009. Environmental specialists conducted field studies on private and public property and collected information from local, county, state and federal agencies. In terms of natural resources, specialists documented wetlands; floodplains; streams, surface waters and watersheds; groundwater; terrestrial habitats; threatened and endangered species, and hazardous waste. Noise monitoring and air quality analyses also were conducted. To collect cultural resource information, specialists identified historic properties and archaeological resources. The Commission is committed to upgrading the Scudder Falls Bridge, as well as adjacent interchanges and sections of I-95, to improve safety and relieve congestion in a manner that minimizes impacts to these resources. The environmental studies were re-assessed for the November 2011 Addendum to the Environmental Assessment in order to assess the effects of tolling on the natural and human environment.