Caldecott Improvement Project

Contra Costa County, CA

For two years, our firm conducted a construction noise impact assessment to assist with the development of the Environmental Document for the proposed fourth bore of the Caldecott Tunnel. This process included ambient noise monitoring, construction noise and vibration measurements at similar construction sites, prediction of construction noise at adjacent residential areas, and mitigation recommendations, which included a sound wall. Our firm designed the sound wall to help mitigate construction noise impacts during the course of the construction for this project. The wall is located between the road construction and the houses that are situated as close as 200 feet away. In addition, we provided support during public meetings with local officials and advocate groups.