Porteous Tunnel Pipeline Replacement Project


SCH Number
Public Agency
Marin Municipal Water District
Document Title
Porteous Tunnel Pipeline Replacement Project
Document Type
NOE - Notice of Exemption
Document Description
The Porteous Tunnel Emergency Pipeline Replacement Project will include maintenance, repair, and minor alterations to the Porteous Tunnel facilities and replacement of approximately 250 feet of pipeline to ensure continued supply of safe drinking water to Ross Valley. Specific project activities include minor grading of two existing access roads to facilitate construction access, improvements to the tunnel structure, replacement of a damaged pipeline, and the installation of pipeline appurtenances (blow-offs, valves, etc.). The Project will not expand system use or capacity.

Contact Information

Michael Ban
Agency Name
Marin Municipal Water District
Contact Types
Lead/Public Agency


Parcel #
Other Location Info
Marin Municipal Water District Watershed Lands

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Section 15301 (b) "Existing Facilities" (Class 1), CEQA Guidelines Section 15302 (c)
Reasons for Exemption
The Project is exempt under CEQA Guidelines Section 15301 (b) as it includes the operation, repair, and minor alteration of existing public facilities involving no expansion of use. The Project is also exempt under CEQA Guidelines Section 15302 (c) because it will replace or reconstruct an existing utility in the same location and with the same purpose and capacity as the structure being replaced. The Project is exempt under CEQA Guidelines Section 15269 (b) because it involve emergency repairs to publicly owned service facilities necessary to maintain essential public health, safety and welfare.


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