Laguna Interceptor Extension Emergency Tunneling Operation


SCH Number
Public Agency
Sacramento County
Document Title
Laguna Interceptor Extension Emergency Tunneling Operation
Document Type
NOE - Notice of Exemption
Document Description
While tunneling under Fishhead Lake, the contractor experienced excessive water infiltration through the tunnel and into the launch shaft. The excessive infiltration of water has in turn compromised the integrity of the tunnel, which is consequently at risk of failure. In order to relieve the water pressure that is compromising the tunnel and preventing the tunneling operations from continuing, a portion of Fishhead Lake will be drained. Once the lake is drained one of two alternatives will be implemented: 1. Drain a portion of the lake, restart the tunnel boring machine, and continue tunneling to the exit point. 2. Drain a portion of the lake, use open excavation to remove the bore machine, and complete the pipe installation by open-cut trench construction.

Contact Information

Joyce Horizumi
Agency Name
Sacramento County Dept. of Environmental Review
Contact Types
Lead/Public Agency


Elk Grove

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Section 15269(b)(c)
Reasons for Exemption
The project consists of a specific action necessary to prevent an emergency including loss of life due to tunnel failure. The new sewer interceptor line is necessary to replace an old sewer collection system that is beyond its functional capacity.

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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