Caltrans, Highway 1 Sonoma Culvert Repair PM 33.1 & 33.2

Caltrans, Highway 1 Sonoma Culvert Repair PM 33.1 & 33.2

At PM 33.10, Caltrans is proposing to remove an existing 42-inch diameter, 150-foot long corrugated steel pipe (CSP) and replace it with a 42-inch diameter, 140-long CSP with polymeric sheet coating. At PM 32.20, Caltrans is proposing to remove an existing 42-inch diameter 160-foot long CSP and replace it with a 42-inch diameter, 160-long CSP with polymeric sheet coating. Flared end sections and rock slope protection will be added to reduce erosion and scour. Caltrans has determined that the temporary project impacts to streams identified as waters of the U.S. and waters of the state will be approximately 1,283 feet2 (330 linear feet). Construction activities will occur within the footprint of the existing structures, and will reduce the length of streams in culverts. Based on the extent and nature of the impacts associated with this project, compensatory mitigation is not required. Due to the current condition of the roadway and the threat of road failure, Caltrans proposes to conduct the work between January 30, 2012 and March 30, 2012. The project is anticipated to take 30 days to construct. Caltrans' contractor phases of the project to provide erosion and sediment control and pollution prevention throughout the project area. All graded areas within the project affected by the construction activities will be appropriately stabilized and BMPs will be implemented to ensure erosion and potential pollution is minimized and controlled.

Sonoma