Caltrans, Highway 1 Upgrade Drainage PM 66.0


SCH Number
Public Agency
Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa
Document Title
Caltrans, Highway 1 Upgrade Drainage PM 66.0
Document Type
NOE - Notice of Exemption
Document Description
The proposed project is located on Highway 1 from PM 65.97 to 66.0, in Mendocino County. The purpose of the proposed project is to remove an 18-inch by 20-foot culvert and an 18-inch by 40-foot culvert and install two 24-inch by 72-foot smooth bore pipe culverts at PM 65.99. The culvert replacement is intended to improve existing drainage conditions adjacent to the highway, which is prone to flooding during heavy rainfall events. In addition, Caltrans proposes clearing sediment and vegetation from approximately 190 linear feet of the adjacent draininge ditches to improve capacity during storm events. The proposed project will result in temporary and permanent impacts to waters of the United States (U.S.) and waters of the State of California (State). The scope of work will include: trenching; culvert installation; headwall installation; and minor clearing of vegetation. A water diversion may be required for the proposed project. Caltrans will utilize Best Management Practices (BMPs) to provide erosion control and pollution prevention throughout the project area during construction. Caltrans has determined that temporary impacts to waters of the U.S. and waters of the State associated with the ditch clearing and culvert replacement would total 1,172 feet^2. Additionally, only eight feet^2 of waters of the U.S and waters of the state will be permanently impacted by the installation of the new drainage system.

Contact Information

Jeremiah Puget
Agency Name
Regional Water Quality Control Board, Region 1 (North Coast), Sa
Contact Types
Lead/Public Agency



Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Sec 15302 (c)
Reasons for Exemption
Existing Highway drainage system with minor temporary impacts.

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613.

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