Laguna Interceptor Extension Emergency Tunneling Operation
Summary
SCH Number
2005118425
Public Agency
Sacramento County
Document Title
Laguna Interceptor Extension Emergency Tunneling Operation
Document Type
NOE - Notice of Exemption
Received
Posted
11/28/2005
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
Name
Joyce Horizumi
Agency Name
Sacramento County Dept. of Environmental Review
Contact Types
Lead/Public Agency
Phone
Location
Cities
Elk Grove
Counties
Sacramento
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.
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